ref: 8a2faea87198104c3f8360a09d126a61e70fecd2
parent: 51f5f5fa41dcfba8d4308cdecf327e29e6129aa1
author: David <gek@katherine>
date: Thu Feb 11 15:04:58 EST 2021
New headers
--- /dev/null
+++ b/src/include/3dMath.h
@@ -1,0 +1,591 @@
+#ifndef CHAD_MATH_H
+#define CHAD_MATH_H
+#include <math.h>
+#include <string.h>
+typedef float f_;
+typedef unsigned int uint;
+
+typedef struct {f_ d[3];} vec3;+typedef struct {int d[3];} ivec3;+typedef struct {f_ d[4];} vec4;+typedef struct {f_ d[16];} mat4;+mat4 swapRowColumnMajor(mat4 in);
+mat4 lookAt(vec3 eye, vec3 at, vec3 tmp);
+vec4 getrow(mat4 a, uint index);
+vec4 getcol(mat4 a, uint index);
+mat4 identitymat4();
+mat4 scalemat4(vec4 s);
+int invmat4(const mat4 m, mat4* invOut);
+mat4 perspective(f_ fov, f_ aspect, f_ near, f_ far);
+vec3 viewport(uint xdim, uint ydim, vec3 input);
+mat4 rotate(vec3 rotation);
+vec3 rotatev3(vec3 in,vec3 axis, f_ ang);
+mat4 translate(vec3 t);
+f_ clampf(f_ a, f_ min, f_ max);
+f_ lengthv3(vec3 a);
+f_ lengthv4(vec4 a);
+vec3 multvec3(vec3 a, vec3 b);
+vec4 multvec4(vec4 a, vec4 b);
+
+vec3 clampvec3(vec3 a, vec3 min, vec3 max);
+vec4 clampvec4(vec4 a, vec4 min, vec4 max);
+f_ dotv3(vec3 a, vec3 b);
+f_ dotv4(vec4 a, vec4 b);
+mat4 multm4(mat4 a, mat4 b);
+vec4 mat4xvec4(mat4 t, vec4 v);
+vec3 crossv3(vec3 a, vec3 b);
+vec3 scalev3(f_ s, vec3 i);
+
+vec4 scalev4(f_ s, vec4 i);
+vec3 normalizev3(vec3 a);
+vec4 normalizev4(vec4 a);
+vec3 addv3(vec3 a, vec3 b);
+vec4 addv4(vec4 a, vec4 b);
+vec3 subv3(vec3 a, vec3 b);
+vec4 subv4(vec4 a, vec4 b);
+vec3 reflect(vec3 in, vec3 norm);
+vec4 upv3(vec3 in, f_ w);
+vec3 downv4(vec4 in);
+
+//Collision detection
+//These Algorithms return the penetration vector into
+//the shape in the first argument
+//With depth of penetration in element 4
+//if depth of penetration is zero or lower then there is no penetration.
+typedef struct{+ vec4 c;
+ vec3 e;
+}aabb;
+typedef aabb colshape; //c.d[3] determines if it's a sphere or box. 0 or less = box, greater than 0 = sphere
+vec4 spherevsphere(vec4 s1, vec4 s2);
+vec4 boxvbox(aabb b1, aabb b2);
+vec3 closestpointAABB(aabb b, vec3 p);
+vec4 aabbvsphere(aabb box,vec4 sph);
+
+
+#ifdef CHAD_MATH_IMPL
+mat4 swapRowColumnMajor(mat4 in){+ mat4 result;
+ vec4 t;
+ int i = 0;
+ t = getrow(in,i);
+ memcpy(result.d+i*4, t.d, 4*4);i++;
+ t = getrow(in,i);
+ memcpy(result.d+i*4, t.d, 4*4);i++;
+ t = getrow(in,i);
+ memcpy(result.d+i*4, t.d, 4*4);i++;
+ t = getrow(in,i);
+ memcpy(result.d+i*4, t.d, 4*4);
+ return result;
+}
+mat4 lookAt(vec3 eye, vec3 at, vec3 tmp){+ mat4 cw = identitymat4();
+ vec3 zaxis = normalizev3(subv3(at,eye));
+ vec3 xaxis = normalizev3(crossv3(zaxis,tmp));
+ vec3 yaxis = crossv3(xaxis, zaxis);
+ zaxis = scalev3(-1,zaxis);
+ cw.d[0*4+0] = xaxis.d[0];
+ cw.d[1*4+0] = xaxis.d[1];
+ cw.d[2*4+0] = xaxis.d[2];
+ cw.d[3*4+0] = -dotv3(xaxis,eye);
+
+ cw.d[0*4+1] = yaxis.d[0];
+ cw.d[1*4+1] = yaxis.d[1];
+ cw.d[2*4+1] = yaxis.d[2];
+ cw.d[3*4+1] = -dotv3(yaxis,eye);
+
+ cw.d[0*4+2] = zaxis.d[0];
+ cw.d[1*4+2] = zaxis.d[1];
+ cw.d[2*4+2] = zaxis.d[2];
+ cw.d[3*4+2] = -dotv3(zaxis,eye);
+ cw.d[0*4+3] = 0;
+ cw.d[1*4+3] = 0;
+ cw.d[2*4+3] = 0;
+ cw.d[3*4+3] = 1;
+ return cw;
+}
+
+/*
+mat4 lookAt(vec3 eye, vec3 at, vec3 tmp){+ vec3 forw = normalizev3(subv3(eye,at));
+
+ vec3 right = crossv3(normalizev3(tmp),forw);
+ vec3 tup = crossv3(forw,right);
+ mat4 cw = identitymat4();
+ cw.d[0*4+0*1] = right.d[0];
+ cw.d[0*4+1*1] = right.d[1];
+ cw.d[0*4+2*1] = right.d[2];
+
+ cw.d[1*4+0*1] = tup.d[0];
+ cw.d[1*4+1*1] = tup.d[1];
+ cw.d[1*4+2*1] = tup.d[2];
+
+ cw.d[2*4+0*1] = forw.d[0];
+ cw.d[2*4+1*1] = forw.d[1];
+ cw.d[2*4+2*1] = forw.d[2];
+
+ cw.d[3*4+0*1] = eye.d[0];
+ cw.d[3*4+1*1] = eye.d[1];
+ cw.d[3*4+2*1] = eye.d[2];
+ cw.d[3*4+3*1] = 1.0;
+ return cw;
+}
+*/
+vec4 getrow(mat4 a, uint index){+ return (vec4){+ .d[0]=a.d[0*4+index],
+ .d[1]=a.d[1*4+index],
+ .d[2]=a.d[2*4+index],
+ .d[3]=a.d[3*4+index]
+ };
+}
+vec3 rotatev3(vec3 in, vec3 axis, f_ ang){+ vec3 t1 = scalev3(cosf(ang),in);
+ vec3 t2 = scalev3(sinf(ang),crossv3(axis,in));
+ vec3 t3 = scalev3((1-cosf(ang))*dotv3(axis,in),axis);
+ return addv3(t1,addv3(t2,t3));
+}
+vec4 getcol(mat4 a, uint index){+ return (vec4){+ .d[0]=a.d[index*4+0],
+ .d[1]=a.d[index*4+1],
+ .d[2]=a.d[index*4+2],
+ .d[3]=a.d[index*4+3]
+ };
+}
+mat4 scalemat4(vec4 s){+ mat4 ret;
+ for(int i = 1; i < 16; i++)
+ ret.d[i]= 0.0;
+ ret.d[0*4 + 0] = s.d[0]; //x scale
+ ret.d[1*4 + 1] = s.d[1]; //y scale
+ ret.d[2*4 + 2] = s.d[2]; //z scale
+ ret.d[3*4 + 3] = s.d[3]; //w scale
+ return ret;
+}
+mat4 identitymat4(){+ return scalemat4(
+ (vec4){.d[0]=1.0,.d[1]=1.0,.d[2]=1.0,.d[3]=1.0}+ );
+}
+int invmat4(const mat4 m, mat4* invOut) //returns 1 if successful
+{+ mat4 inv;
+ f_ det;
+ int i;
+
+ inv.d[0] = m.d[5] * m.d[10] * m.d[15] -
+ m.d[5] * m.d[11] * m.d[14] -
+ m.d[9] * m.d[6] * m.d[15] +
+ m.d[9] * m.d[7] * m.d[14] +
+ m.d[13] * m.d[6] * m.d[11] -
+ m.d[13] * m.d[7] * m.d[10];
+
+ inv.d[4] = -m.d[4] * m.d[10] * m.d[15] +
+ m.d[4] * m.d[11] * m.d[14] +
+ m.d[8] * m.d[6] * m.d[15] -
+ m.d[8] * m.d[7] * m.d[14] -
+ m.d[12] * m.d[6] * m.d[11] +
+ m.d[12] * m.d[7] * m.d[10];
+
+ inv.d[8] = m.d[4] * m.d[9] * m.d[15] -
+ m.d[4] * m.d[11] * m.d[13] -
+ m.d[8] * m.d[5] * m.d[15] +
+ m.d[8] * m.d[7] * m.d[13] +
+ m.d[12] * m.d[5] * m.d[11] -
+ m.d[12] * m.d[7] * m.d[9];
+
+ inv.d[12] = -m.d[4] * m.d[9] * m.d[14] +
+ m.d[4] * m.d[10] * m.d[13] +
+ m.d[8] * m.d[5] * m.d[14] -
+ m.d[8] * m.d[6] * m.d[13] -
+ m.d[12] * m.d[5] * m.d[10] +
+ m.d[12] * m.d[6] * m.d[9];
+
+ inv.d[1] = -m.d[1] * m.d[10] * m.d[15] +
+ m.d[1] * m.d[11] * m.d[14] +
+ m.d[9] * m.d[2] * m.d[15] -
+ m.d[9] * m.d[3] * m.d[14] -
+ m.d[13] * m.d[2] * m.d[11] +
+ m.d[13] * m.d[3] * m.d[10];
+
+ inv.d[5] = m.d[0] * m.d[10] * m.d[15] -
+ m.d[0] * m.d[11] * m.d[14] -
+ m.d[8] * m.d[2] * m.d[15] +
+ m.d[8] * m.d[3] * m.d[14] +
+ m.d[12] * m.d[2] * m.d[11] -
+ m.d[12] * m.d[3] * m.d[10];
+
+ inv.d[9] = -m.d[0] * m.d[9] * m.d[15] +
+ m.d[0] * m.d[11] * m.d[13] +
+ m.d[8] * m.d[1] * m.d[15] -
+ m.d[8] * m.d[3] * m.d[13] -
+ m.d[12] * m.d[1] * m.d[11] +
+ m.d[12] * m.d[3] * m.d[9];
+
+ inv.d[13] = m.d[0] * m.d[9] * m.d[14] -
+ m.d[0] * m.d[10] * m.d[13] -
+ m.d[8] * m.d[1] * m.d[14] +
+ m.d[8] * m.d[2] * m.d[13] +
+ m.d[12] * m.d[1] * m.d[10] -
+ m.d[12] * m.d[2] * m.d[9];
+
+ inv.d[2] = m.d[1] * m.d[6] * m.d[15] -
+ m.d[1] * m.d[7] * m.d[14] -
+ m.d[5] * m.d[2] * m.d[15] +
+ m.d[5] * m.d[3] * m.d[14] +
+ m.d[13] * m.d[2] * m.d[7] -
+ m.d[13] * m.d[3] * m.d[6];
+
+ inv.d[6] = -m.d[0] * m.d[6] * m.d[15] +
+ m.d[0] * m.d[7] * m.d[14] +
+ m.d[4] * m.d[2] * m.d[15] -
+ m.d[4] * m.d[3] * m.d[14] -
+ m.d[12] * m.d[2] * m.d[7] +
+ m.d[12] * m.d[3] * m.d[6];
+
+ inv.d[10] = m.d[0] * m.d[5] * m.d[15] -
+ m.d[0] * m.d[7] * m.d[13] -
+ m.d[4] * m.d[1] * m.d[15] +
+ m.d[4] * m.d[3] * m.d[13] +
+ m.d[12] * m.d[1] * m.d[7] -
+ m.d[12] * m.d[3] * m.d[5];
+
+ inv.d[14] = -m.d[0] * m.d[5] * m.d[14] +
+ m.d[0] * m.d[6] * m.d[13] +
+ m.d[4] * m.d[1] * m.d[14] -
+ m.d[4] * m.d[2] * m.d[13] -
+ m.d[12] * m.d[1] * m.d[6] +
+ m.d[12] * m.d[2] * m.d[5];
+
+ inv.d[3] = -m.d[1] * m.d[6] * m.d[11] +
+ m.d[1] * m.d[7] * m.d[10] +
+ m.d[5] * m.d[2] * m.d[11] -
+ m.d[5] * m.d[3] * m.d[10] -
+ m.d[9] * m.d[2] * m.d[7] +
+ m.d[9] * m.d[3] * m.d[6];
+
+ inv.d[7] = m.d[0] * m.d[6] * m.d[11] -
+ m.d[0] * m.d[7] * m.d[10] -
+ m.d[4] * m.d[2] * m.d[11] +
+ m.d[4] * m.d[3] * m.d[10] +
+ m.d[8] * m.d[2] * m.d[7] -
+ m.d[8] * m.d[3] * m.d[6];
+
+ inv.d[11] = -m.d[0] * m.d[5] * m.d[11] +
+ m.d[0] * m.d[7] * m.d[9] +
+ m.d[4] * m.d[1] * m.d[11] -
+ m.d[4] * m.d[3] * m.d[9] -
+ m.d[8] * m.d[1] * m.d[7] +
+ m.d[8] * m.d[3] * m.d[5];
+
+ inv.d[15] = m.d[0] * m.d[5] * m.d[10] -
+ m.d[0] * m.d[6] * m.d[9] -
+ m.d[4] * m.d[1] * m.d[10] +
+ m.d[4] * m.d[2] * m.d[9] +
+ m.d[8] * m.d[1] * m.d[6] -
+ m.d[8] * m.d[2] * m.d[5];
+
+ det = m.d[0] * inv.d[0] + m.d[1] * inv.d[4] + m.d[2] * inv.d[8] + m.d[3] * inv.d[12];
+ if (det == 0)
+ return 0;
+ det = 1.0 / det;
+ for (i = 0; i < 16; i++)
+ invOut->d[i] = inv.d[i] * det;
+ return 1;
+}
+mat4 perspective(f_ fov, f_ aspect, f_ near, f_ far){+ mat4 ret;
+ f_ D2R = 3.14159265358979323 / 180.0;
+ f_ yScale = 1.0/tanf(D2R * fov/2);
+ f_ xScale = yScale/aspect;
+ f_ nearmfar = near-far;
+
+ ret.d[0*4+0] = xScale; ret.d[0*4+1]=0; ret.d[0*4+2]=0; ret.d[0*4+3]=0;
+ ret.d[1*4+0]=0; ret.d[1*4+1]=yScale;ret.d[1*4+2]=0; ret.d[1*4+3]=0;
+ ret.d[2*4+0]=0; ret.d[2*4+1]=0; ret.d[2*4+2]=(far+near)/nearmfar;ret.d[2*4+3]=-1;
+ ret.d[3*4+0]=0; ret.d[3*4+1]=0; ret.d[3*4+2]=2*far*near/nearmfar;ret.d[3*4+3]=0;
+
+ /*
+ ret.d[0*4+0] = xScale; ret.d[0*4+1]=0; ret.d[0*4+2]=0; ret.d[0*4+3]=0;
+ ret.d[1*4+0]=0; ret.d[1*4+1]=yScale;ret.d[1*4+2]=0; ret.d[1*4+3]=0;
+ ret.d[2*4+0]=0; ret.d[2*4+1]=0; ret.d[2*4+2]=(far+near)/nearmfar; ret.d[2*4+3]=2*far*near/nearmfar;
+ ret.d[3*4+0]=0; ret.d[3*4+1]=0; ret.d[3*4+2]=-1; ret.d[3*4+3]=0;
+ */
+ return ret;
+}
+vec3 viewport(uint xdim, uint ydim, vec3 input){+ input.d[0] += 1;
+ input.d[1] += 1;
+ input.d[0] *= (f_)xdim / 2.0;
+ input.d[1] *= (f_)ydim / 2.0;
+ input.d[2] = (input.d[2])/2.0;
+ return input;
+}
+mat4 rotate(vec3 rotation){+ f_ a = rotation.d[0];
+ f_ b = rotation.d[1];
+ f_ c = rotation.d[2];
+ mat4 rm;
+ rm.d[0*4 + 0] = cosf(a)*cosf(b);
+ rm.d[1*4 + 0] = sinf(a)*cosf(b);
+ rm.d[2*4 + 0] = -sinf(b);
+ rm.d[0*4 + 1] = cosf(a)*sinf(b)*sinf(c)-sinf(a)*cosf(c);
+ rm.d[1*4 + 1] = sinf(a)*sinf(b)*sinf(c)+cosf(a)*cosf(c);
+ rm.d[2*4 + 1] = cosf(b)*sinf(c);
+ rm.d[0*4 + 2] = cosf(a)*sinf(b)*cosf(c)+sinf(a)*sinf(c);
+ rm.d[1*4 + 2] = sinf(a)*sinf(b)*cosf(c)-cosf(a)*sinf(c);
+ rm.d[2*4 + 2] = cosf(b)*cosf(c);
+ //the other parts
+ rm.d[0*4 + 3] = 0;
+ rm.d[1*4 + 3] = 0;
+ rm.d[2*4 + 3] = 0;
+ rm.d[3*4 + 3] = 1; //the bottom right corner of the matrix.
+ rm.d[3*4 + 0] = 0;
+ rm.d[3*4 + 1] = 0;
+ rm.d[3*4 + 2] = 0;
+ return rm;
+}
+mat4 translate(vec3 t){+ mat4 tm = identitymat4();
+ tm.d[3*4+0] = t.d[0];
+ tm.d[3*4+1] = t.d[1];
+ tm.d[3*4+2] = t.d[2];
+ return tm;
+}
+
+f_ clampf(f_ a, f_ min, f_ max){+ if(a<min) return min;
+ if(a>max) return max;
+ return a;
+}
+f_ lengthv3(vec3 a){+ return sqrtf(a.d[0] * a.d[0] + a.d[1] * a.d[1] + a.d[2] * a.d[2]);
+}
+f_ lengthv4(vec4 a){+ return sqrtf(a.d[0] * a.d[0] + a.d[1] * a.d[1] + a.d[2] * a.d[2] + a.d[3] * a.d[3]);
+}
+vec3 multvec3(vec3 a, vec3 b){+ return (vec3){+ .d[0]=a.d[0]*b.d[0],
+ .d[1]=a.d[1]*b.d[1],
+ .d[2]=a.d[2]*b.d[2]
+ };
+}
+vec4 multvec4(vec4 a, vec4 b){+ return (vec4){+ .d[0]=a.d[0]*b.d[0],
+ .d[1]=a.d[1]*b.d[1],
+ .d[2]=a.d[2]*b.d[2],
+ .d[3]=a.d[3]*b.d[3]
+ };
+}
+vec3 clampvec3(vec3 a, vec3 min, vec3 max){+ vec3 ret;
+ ret.d[0] = clampf(a.d[0],min.d[0],max.d[0]);
+ ret.d[1] = clampf(a.d[1],min.d[1],max.d[1]);
+ ret.d[2] = clampf(a.d[2],min.d[2],max.d[2]);
+ return ret;
+}
+vec4 clampvec4(vec4 a, vec4 min, vec4 max){+ vec4 ret;
+ ret.d[0] = clampf(a.d[0],min.d[0],max.d[0]);
+ ret.d[1] = clampf(a.d[1],min.d[1],max.d[1]);
+ ret.d[2] = clampf(a.d[2],min.d[2],max.d[2]);
+ ret.d[3] = clampf(a.d[3],min.d[3],max.d[3]);
+ return ret;
+}
+f_ dotv3(vec3 a, vec3 b){+ return a.d[0] * b.d[0] + a.d[1] * b.d[1] + a.d[2] * b.d[2];
+}
+f_ dotv4(vec4 a, vec4 b){+ return a.d[0] * b.d[0] + a.d[1] * b.d[1] + a.d[2] * b.d[2] + a.d[3] * b.d[3];
+}
+mat4 multm4(mat4 a, mat4 b){+ mat4 ret;
+ for(int i = 0; i < 4; i++)
+ for(int j = 0; j < 4; j++)
+ ret.d[i*4 + j] = dotv4(
+ getrow(a, j),
+ getcol(b, i)
+ );
+ return ret;
+}
+vec4 mat4xvec4(mat4 t, vec4 v){+ uint i = 0;
+ vec4 vr;
+ vr.d[0] = t.d[0*4+i] * v.d[0] +
+ t.d[1*4+i] * v.d[1] +
+ t.d[2*4+i] * v.d[2] +
+ t.d[3*4+i] * v.d[3];
+ i++;
+ vr.d[1] = t.d[0*4+i] * v.d[0] +
+ t.d[1*4+i] * v.d[1] +
+ t.d[2*4+i] * v.d[2] +
+ t.d[3*4+i] * v.d[3];
+ i++;
+ vr.d[2] = t.d[0*4+i] * v.d[0] +
+ t.d[1*4+i] * v.d[1] +
+ t.d[2*4+i] * v.d[2] +
+ t.d[3*4+i] * v.d[3];
+ i++;
+ vr.d[3] = t.d[0*4+i] * v.d[0] +
+ t.d[1*4+i] * v.d[1] +
+ t.d[2*4+i] * v.d[2] +
+ t.d[3*4+i] * v.d[3];
+ return vr;
+}
+vec3 crossv3(vec3 a, vec3 b){+ vec3 retval;
+ retval.d[0] = a.d[1] * b.d[2] - a.d[2] * b.d[1];
+ retval.d[1] = a.d[2] * b.d[0] - a.d[0] * b.d[2];
+ retval.d[2] = a.d[0] * b.d[1] - a.d[1] * b.d[0];
+ return retval;
+}
+vec3 scalev3(f_ s, vec3 i){i.d[0] *= s; i.d[1] *= s; i.d[2] *= s; return i;}+
+vec4 scalev4(f_ s, vec4 i){i.d[0] *= s; i.d[1] *= s; i.d[2] *= s;i.d[3] *= s; return i;}+vec3 normalizev3(vec3 a){+ if(lengthv3(a)==0) return (vec3){.d[0]=0.0,.d[1]=0.0,.d[2]=1.0};+ return scalev3(1.0/lengthv3(a), a);
+}
+vec4 normalizev4(vec4 a){+ if(lengthv4(a)==0) return (vec4){.d[0]=0.0,.d[1]=0.0,.d[2]=1.0,.d[3]=0.0};+ return scalev4(1.0/lengthv4(a), a);
+}
+vec3 addv3(vec3 a, vec3 b){+ a.d[0] += b.d[0]; a.d[1] += b.d[1]; a.d[2] += b.d[2]; return a;
+}
+vec4 addv4(vec4 a, vec4 b){+ a.d[0] += b.d[0]; a.d[1] += b.d[1]; a.d[2] += b.d[2]; a.d[3] += b.d[3]; return a;
+}
+vec3 subv3(vec3 a, vec3 b){+ return addv3(a,scalev3(-1,b));
+}
+vec4 subv4(vec4 a, vec4 b){+ return addv4(a,scalev4(-1,b));
+}
+vec3 reflect(vec3 in, vec3 norm){+ return
+ addv3(in, //I +
+ scalev3(-2.0*dotv3(norm, in), //-2.0 * dotv3(norm,in) *
+ norm //N
+ )
+ );
+}
+vec4 upv3(vec3 in, f_ w){+ return (vec4){+ .d[0]=in.d[0],
+ .d[1]=in.d[1],
+ .d[2]=in.d[2],
+ .d[3]=w
+ };
+}
+vec3 downv4(vec4 in){+ return (vec3){+ .d[0]=in.d[0],
+ .d[1]=in.d[1],
+ .d[2]=in.d[2]
+ };
+}
+
+//Collision detection
+//These Algorithms return the penetration vector into
+//the shape in the first argument
+//With depth of penetration in element 4
+//if depth of penetration is zero or lower then there is no penetration.
+vec4 spherevsphere(vec4 s1, vec4 s2){ //x,y,z,radius+ vec4 ret;
+ ret = upv3(
+ subv3(
+ downv4(s1),
+ downv4(s2)
+ )
+ ,0.0
+ );
+ ret.d[3]= -1 * sqrtf(
+ (s1.d[0]-s2.d[0])*(s1.d[0]-s2.d[0])+
+ (s1.d[1]-s2.d[1])*(s1.d[1]-s2.d[1])+
+ (s1.d[2]-s2.d[2])*(s1.d[2]-s2.d[2])
+ ) + s1.d[3] + s2.d[3];
+ return ret;
+}
+vec4 boxvbox(aabb b1, aabb b2){ //Just points along the minimum separating axis, Nothing fancy.+ vec4 ret = (vec4){+ .d[0]=0,
+ .d[1]=0,
+ .d[2]=0,
+ .d[3]=0
+ };
+ //vec3 sumextents = addv3(b1.e,b2.e);
+ vec3 b1min = subv3(downv4(b1.c),b1.e);
+ vec3 b2min = subv3(downv4(b2.c),b2.e);
+ vec3 b1max = addv3(downv4(b1.c),b1.e);
+ vec3 b2max = addv3(downv4(b2.c),b2.e);
+ vec3 axispen[2];
+ //For any overlap, these are negative.
+ //These ones point toward b2 in an intersection, so they need to be inverted.
+ axispen[0].d[0] = b1min.d[0] - b2max.d[0];
+ axispen[0].d[1] = b1min.d[1] - b2max.d[1];
+ axispen[0].d[2] = b1min.d[2] - b2max.d[2];
+ //These ones point toward b1 in an intersection. They can be left alone.
+ axispen[1].d[0] = b2min.d[0] - b1max.d[0];
+ axispen[1].d[1] = b2min.d[1] - b1max.d[1];
+ axispen[1].d[2] = b2min.d[2] - b1max.d[2];
+ //if they are not intersecting...
+ if(!(
+ (axispen[0].d[0] < 0 && axispen[1].d[0] < 0) &&
+ (axispen[0].d[1] < 0 && axispen[1].d[1] < 0) &&
+ (axispen[0].d[2] < 0 && axispen[1].d[2] < 0)
+ )){+ return ret;
+ }
+ axispen[0] = scalev3(-1,axispen[0]); //invert these to point toward b1
+ int minimum = 0;
+ f_ mindist = fabsf(axispen[0].d[0]);
+ for(int i = 1; i < 6;i++){+ f_ d = fabsf(axispen[i/3].d[i%3]);
+ if(d < mindist){+ minimum = i;
+ mindist = d;
+ }
+ }
+ ret =
+ (vec4){+ .d[0]=(minimum%3==0)?axispen[minimum/3].d[minimum%3]:0,
+ .d[1]=(minimum%3==1)?axispen[minimum/3].d[minimum%3]:0,
+ .d[2]=(minimum%3==2)?axispen[minimum/3].d[minimum%3]:0,
+ .d[3]=mindist
+ };
+ return ret;
+}
+vec3 closestpointAABB(aabb b, vec3 p){+ vec3 b1min = subv3(downv4(b.c),b.e);
+ vec3 b1max = addv3(downv4(b.c),b.e);
+ return clampvec3(p,b1min,b1max);
+}
+vec4 aabbvsphere(aabb box,vec4 sph){+ vec4 ret;
+ vec3 p = closestpointAABB(box,downv4(sph));
+ vec3 v = subv3(p,downv4(sph));
+ f_ d2 = dotv3(v,v);
+
+ if(d2 <= sph.d[3] * sph.d[3]){+ f_ len = lengthv3(v);
+ ret = upv3(v,len);
+ return ret;
+ }
+ else
+ return (vec4){+ .d[0]=0,
+ .d[1]=0,
+ .d[2]=0,
+ .d[3]=0
+ };
+
+}
+//end of chad math impl
+#endif
+//END Math_Library.h~~~~~~~~~~~~~~~~~~~~
+
+#endif
--- /dev/null
+++ b/src/include/lockstepthread.h
@@ -1,0 +1,123 @@
+#ifndef LOCKSTEPTHREAD_H
+#define LOCKSTEPTHREAD_H
+#include <pthread.h>
+#include <stdio.h>
+typedef struct {+ pthread_mutex_t myMutex;
+ pthread_barrier_t myBarrier;
+ pthread_t myThread;
+ int isThreadLive;
+ int shouldKillThread;
+ int state;
+ void (*execute)();
+} lsthread;
+void init_lsthread(lsthread* t);
+void start_lsthread(lsthread* t);
+void kill_lsthread(lsthread* t);
+void lock(lsthread* t);
+void step(lsthread* t);
+void* lsthread_func(void* me_void);
+#ifdef LOCKSTEPTHREAD_IMPL
+//function declarations
+
+void init_lsthread(lsthread* t){+ t->myMutex = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;
+ pthread_barrier_init(&t->myBarrier, NULL, 2);
+ t->isThreadLive = 0;
+ t->shouldKillThread = 0;
+ t->state = 0;
+ t->execute = NULL;
+}
+void destroy_lsthread(lsthread* t){+ pthread_mutex_destroy(&t->myMutex);
+ pthread_barrier_destroy(&t->myBarrier);
+}
+void lock(lsthread* t){+ if(t->state == 1)return;//if already locked, nono
+ if(!t->isThreadLive)return;
+ //puts("\nLocking! <lock>");+ pthread_barrier_wait(&t->myBarrier);
+ //puts("\nPast Wait!");+ if(pthread_mutex_lock(&t->myMutex))
+ puts("\nError locking mutex.");+ t->state = 1;
+ //puts("\nPast Lock </lock>");+}
+
+void step(lsthread* t){+ if(t->state == -1)return; //if already stepping, nono
+ if(!t->isThreadLive)return;
+ //puts("\nStepping! <step>");+ if(pthread_mutex_unlock(&(t->myMutex)))
+ puts("\nError unlocking mutex");+ //puts("\nDone Unlocking!");+ pthread_barrier_wait(&t->myBarrier);
+ t->state = -1;
+ //puts("\nPast Wait </step>");+}
+void kill_lsthread(lsthread* t){+ if(!t->isThreadLive)return;
+ //puts("\nTime for the thread to die...");+ if(t->state != 1){+ lock(t);
+ //puts("\nPast lock!");+ }
+ t->shouldKillThread = 1;
+
+ step(t);
+ //puts("\nPast step!");+ pthread_join(t->myThread,NULL);
+ //if(pthread_kill(t->myThread)){+ // puts("\nError killing thread.");+ //}
+ t->isThreadLive = 0;
+ t->shouldKillThread = 0;
+}
+void* lsthread_func(void* me_void){+ lsthread* me = (lsthread*) me_void;
+ int ret = 0;
+ if (!me)pthread_exit(NULL);
+ if(!me->execute)pthread_exit(NULL);
+ while (1) {+ //ret = pthread_cond_wait(&(me->myCond), &(me->myMutex));
+ pthread_barrier_wait(&me->myBarrier);
+ //puts("\nTHREAD ACTIVATING...");+ pthread_mutex_lock(&me->myMutex);
+ //puts("\nTHREAD ACTIVATED");+ //if(ret)pthread_exit(NULL);
+ if (!(me->shouldKillThread) && me->execute)
+ me->execute();
+ else if(me->shouldKillThread){+ pthread_mutex_unlock(&me->myMutex);
+ //puts("\nTHREAD DYING...");+ //pthread_barrier_wait(&me->myBarrier);
+ //puts("\nTHREAD DED!");+ pthread_exit(NULL);
+ }
+ //puts("\nTHREAD DEACTIVATING...");+ pthread_mutex_unlock(&me->myMutex);
+ //puts("\nTHREAD DEACTIVATED");+ pthread_barrier_wait(&me->myBarrier);
+ //puts("\nTIME FOR A NEW CYCLE...");+ }
+ pthread_exit(NULL);
+}
+void start_lsthread(lsthread* t){+ if(t->isThreadLive)return;
+ t->isThreadLive = 1;
+ t->shouldKillThread = 0;
+ if(pthread_mutex_lock(&t->myMutex))
+ puts("\nError locking mutex.");+ t->state = 1; //LOCKED
+ pthread_create(
+ &t->myThread,
+ NULL,
+ lsthread_func,
+ (void*)t
+ );
+}
+#endif
+//end of implementation
+
+#endif
+//end of header
\ No newline at end of file
--- /dev/null
+++ b/src/include/stb_image.h
@@ -1,0 +1,8002 @@
+/* stb_image - v2.25 - public domain image loader - http://nothings.org/stb
+ no warranty implied; use at your own risk
+
+ Do this:
+ #define STB_IMAGE_IMPLEMENTATION
+ before you include this file in *one* C or C++ file to create the
+implementation.
+
+ // i.e. it should look like this:
+ #include ...
+ #include ...
+ #include ...
+ #define STB_IMAGE_IMPLEMENTATION
+ #include "stb_image.h"
+
+ You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
+ And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using
+malloc,realloc,free
+
+
+ QUICK NOTES:
+ Primarily of interest to game developers and other people who can
+ avoid problematic images and only need the trivial interface
+
+ JPEG baseline & progressive (12 bpc/arithmetic not supported, same as
+stock IJG lib) PNG 1/2/4/8/16-bit-per-channel
+
+ TGA (not sure what subset, if a subset)
+ BMP non-1bpp, non-RLE
+ PSD (composited view only, no extra channels, 8/16 bit-per-channel)
+
+ GIF (*comp always reports as 4-channel)
+ HDR (radiance rgbE format)
+ PIC (Softimage PIC)
+ PNM (PPM and PGM binary only)
+
+ Animated GIF still needs a proper API, but here's one way to do it:
+ http://gist.github.com/urraka/685d9a6340b26b830d49
+
+ - decode from memory or through FILE (define STBI_NO_STDIO to remove code)
+ - decode from arbitrary I/O callbacks
+ - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON)
+
+ Full documentation under "DOCUMENTATION" below.
+
+
+LICENSE
+
+ See end of file for license information.
+
+RECENT REVISION HISTORY:
+
+ 2.25 (2020-02-02) fix warnings
+ 2.24 (2020-02-02) fix warnings; thread-local failure_reason and
+flip_vertically 2.23 (2019-08-11) fix clang static analysis warning 2.22
+(2019-03-04) gif fixes, fix warnings 2.21 (2019-02-25) fix typo in comment 2.20
+(2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs
+ 2.19 (2018-02-11) fix warning
+ 2.18 (2018-01-30) fix warnings
+ 2.17 (2018-01-29) bugfix, 1-bit BMP, 16-bitness query, fix warnings
+ 2.16 (2017-07-23) all functions have 16-bit variants; optimizations;
+bugfixes 2.15 (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE
+detection on GCC 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for
+Imagenet JPGs 2.13 (2016-12-04) experimental 16-bit API, only for PNG so far;
+fixes 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes 2.11
+(2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64 RGB-format JPEG; remove
+white matting in PSD; allocate large structures on the stack; correct channel
+count for PNG & BMP 2.10 (2016-01-22) avoid warning introduced in 2.09 2.09
+(2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
+
+ See end of file for full revision history.
+
+
+ ============================ Contributors =========================
+
+ Image formats Extensions, features
+ Sean Barrett (jpeg, png, bmp) Jetro Lauha (stbi_info)
+ Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (stbi_info)
+ Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG)
+ Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks)
+ Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG)
+ Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip)
+ Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD)
+ github:urraka (animated gif) Junggon Kim (PNM comments)
+ Christopher Forseth (animated gif) Daniel Gibson (16-bit TGA)
+ socks-the-fox (16-bit PNG)
+ Jeremy Sawicki (handle all ImageNet
+JPGs) Optimizations & bugfixes Mikhail Morozov (1-bit BMP)
+ Fabian "ryg" Giesen Anael Seghezzi (is-16-bit query)
+ Arseny Kapoulkine
+ John-Mark Allen
+ Carmelo J Fdez-Aguera
+
+ Bug & warning fixes
+ Marc LeBlanc David Woo Guillaume George Martins
+Mozeiko Christpher Lloyd Jerry Jansson Joseph Thomson Phil
+Jordan Dave Moore Roy Eltham Hayaki Saito Nathan Reed
+ Won Chun Luke Graham Johan Duparc Nick Verigakis
+ the Horde3D community Thomas Ruf Ronny Chevalier github:rlyeh
+ Janez Zemva John Bartholomew Michal Cichon github:romigrou
+ Jonathan Blow Ken Hamada Tero Hanninen github:svdijk
+ Laurent Gomila Cort Stratton Sergio Gonzalez github:snagar
+ Aruelien Pocheville Thibault Reuille Cass Everitt github:Zelex
+ Ryamond Barbiero Paul Du Bois Engin Manap github:grim210
+ Aldo Culquicondor Philipp Wiesemann Dale Weiler github:sammyhw
+ Oriol Ferrer Mesia Josh Tobin Matthew Gregan github:phprus
+ Julian Raschke Gregory Mullen Baldur Karlsson
+github:poppolopoppo Christian Floisand Kevin Schmidt JR Smith
+github:darealshinji Brad Weinberger Matvey Cherevko
+github:Michaelangel007 Blazej Dariusz Roszkowski Alexander
+Veselov
+*/
+
+#ifndef STBI_INCLUDE_STB_IMAGE_H
+#define STBI_INCLUDE_STB_IMAGE_H
+
+// DOCUMENTATION
+//
+// Limitations:
+// - no 12-bit-per-channel JPEG
+// - no JPEGs with arithmetic coding
+// - GIF always returns *comp=4
+//
+// Basic usage (see HDR discussion below for HDR usage):
+// int x,y,n;
+// unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
+// // ... process data if not NULL ...
+// // ... x = width, y = height, n = # 8-bit components per pixel ...
+// // ... replace '0' with '1'..'4' to force that many components per pixel
+// // ... but 'n' will always be the number that it would have been if you
+// said 0 stbi_image_free(data)
+//
+// Standard parameters:
+// int *x -- outputs image width in pixels
+// int *y -- outputs image height in pixels
+// int *channels_in_file -- outputs # of image components in image file
+// int desired_channels -- if non-zero, # of image components requested in
+// result
+//
+// The return value from an image loader is an 'unsigned char *' which points
+// to the pixel data, or NULL on an allocation failure or if the image is
+// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels,
+// with each pixel consisting of N interleaved 8-bit components; the first
+// pixel pointed to is top-left-most in the image. There is no padding between
+// image scanlines or between pixels, regardless of format. The number of
+// components N is 'desired_channels' if desired_channels is non-zero, or
+// *channels_in_file otherwise. If desired_channels is non-zero,
+// *channels_in_file has the number of components that _would_ have been
+// output otherwise. E.g. if you set desired_channels to 4, you will always
+// get RGBA output, but you can check *channels_in_file to see if it's trivially
+// opaque because e.g. there were only 3 channels in the source image.
+//
+// An output image with N components has the following components interleaved
+// in this order in each pixel:
+//
+// N=#comp components
+// 1 grey
+// 2 grey, alpha
+// 3 red, green, blue
+// 4 red, green, blue, alpha
+//
+// If image loading fails for any reason, the return value will be NULL,
+// and *x, *y, *channels_in_file will be unchanged. The function
+// stbi_failure_reason() can be queried for an extremely brief, end-user
+// unfriendly explanation of why the load failed. Define STBI_NO_FAILURE_STRINGS
+// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get
+// slightly more user-friendly ones.
+//
+// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
+//
+// ===========================================================================
+//
+// UNICODE:
+//
+// If compiling for Windows and you wish to use Unicode filenames, compile
+// with
+// #define STBI_WINDOWS_UTF8
+// and pass utf8-encoded filenames. Call stbi_convert_wchar_to_utf8 to convert
+// Windows wchar_t filenames to utf8.
+//
+// ===========================================================================
+//
+// Philosophy
+//
+// stb libraries are designed with the following priorities:
+//
+// 1. easy to use
+// 2. easy to maintain
+// 3. good performance
+//
+// Sometimes I let "good performance" creep up in priority over "easy to
+// maintain", and for best performance I may provide less-easy-to-use APIs that
+// give higher performance, in addition to the easy-to-use ones. Nevertheless,
+// it's important to keep in mind that from the standpoint of you, a client of
+// this library, all you care about is #1 and #3, and stb libraries DO NOT
+// emphasize #3 above all.
+//
+// Some secondary priorities arise directly from the first two, some of which
+// provide more explicit reasons why performance can't be emphasized.
+//
+// - Portable ("ease of use")+// - Small source code footprint ("easy to maintain")+// - No dependencies ("ease of use")+//
+// ===========================================================================
+//
+// I/O callbacks
+//
+// I/O callbacks allow you to read from arbitrary sources, like packaged
+// files or some other source. Data read from callbacks are processed
+// through a small internal buffer (currently 128 bytes) to try to reduce
+// overhead.
+//
+// The three functions you must define are "read" (reads some bytes of data),
+// "skip" (skips some bytes of data), "eof" (reports if the stream is at the
+// end).
+//
+// ===========================================================================
+//
+// SIMD support
+//
+// The JPEG decoder will try to automatically use SIMD kernels on x86 when
+// supported by the compiler. For ARM Neon support, you must explicitly
+// request it.
+//
+// (The old do-it-yourself SIMD API is no longer supported in the current
+// code.)
+//
+// On x86, SSE2 will automatically be used when available based on a run-time
+// test; if not, the generic C versions are used as a fall-back. On ARM targets,
+// the typical path is to have separate builds for NEON and non-NEON devices
+// (at least this is true for iOS and Android). Therefore, the NEON support is
+// toggled by a build flag: define STBI_NEON to get NEON loops.
+//
+// If for some reason you do not want to use any of SIMD code, or if
+// you have issues compiling it, you can disable it entirely by
+// defining STBI_NO_SIMD.
+//
+// ===========================================================================
+//
+// HDR image support (disable by defining STBI_NO_HDR)
+//
+// stb_image supports loading HDR images in general, and currently the Radiance
+// .HDR file format specifically. You can still load any file through the
+// existing interface; if you attempt to load an HDR file, it will be
+// automatically remapped to LDR, assuming gamma 2.2 and an arbitrary scale
+// factor defaulting to 1; both of these constants can be reconfigured through
+// this interface:
+//
+// stbi_hdr_to_ldr_gamma(2.2f);
+// stbi_hdr_to_ldr_scale(1.0f);
+//
+// (note, do not use _inverse_ constants; stbi_image will invert them
+// appropriately).
+//
+// Additionally, there is a new, parallel interface for loading files as
+// (linear) floats to preserve the full dynamic range:
+//
+// float *data = stbi_loadf(filename, &x, &y, &n, 0);
+//
+// If you load LDR images through this interface, those images will
+// be promoted to floating point values, run through the inverse of
+// constants corresponding to the above:
+//
+// stbi_ldr_to_hdr_scale(1.0f);
+// stbi_ldr_to_hdr_gamma(2.2f);
+//
+// Finally, given a filename (or an open file or memory block--see header
+// file for details) containing image data, you can query for the "most
+// appropriate" interface to use (that is, whether the image is HDR or
+// not), using:
+//
+// stbi_is_hdr(char *filename);
+//
+// ===========================================================================
+//
+// iPhone PNG support:
+//
+// By default we convert iphone-formatted PNGs back to RGB, even though
+// they are internally encoded differently. You can disable this conversion
+// by calling stbi_convert_iphone_png_to_rgb(0), in which case
+// you will always just get the native iphone "format" through (which
+// is BGR stored in RGB).
+//
+// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
+// pixel to remove any premultiplied alpha *only* if the image file explicitly
+// says there's premultiplied data (currently only happens in iPhone images,
+// and only if iPhone convert-to-rgb processing is on).
+//
+// ===========================================================================
+//
+// ADDITIONAL CONFIGURATION
+//
+// - You can suppress implementation of any of the decoders to reduce
+// your code footprint by #defining one or more of the following
+// symbols before creating the implementation.
+//
+// STBI_NO_JPEG
+// STBI_NO_PNG
+// STBI_NO_BMP
+// STBI_NO_PSD
+// STBI_NO_TGA
+// STBI_NO_GIF
+// STBI_NO_HDR
+// STBI_NO_PIC
+// STBI_NO_PNM (.ppm and .pgm)
+//
+// - You can request *only* certain decoders and suppress all other ones
+// (this will be more forward-compatible, as addition of new decoders
+// doesn't require you to disable them explicitly):
+//
+// STBI_ONLY_JPEG
+// STBI_ONLY_PNG
+// STBI_ONLY_BMP
+// STBI_ONLY_PSD
+// STBI_ONLY_TGA
+// STBI_ONLY_GIF
+// STBI_ONLY_HDR
+// STBI_ONLY_PIC
+// STBI_ONLY_PNM (.ppm and .pgm)
+//
+// - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still
+// want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB
+//
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif // STBI_NO_STDIO
+
+#define STBI_VERSION 1
+
+enum {+ STBI_default = 0, // only used for desired_channels
+
+ STBI_grey = 1,
+ STBI_grey_alpha = 2,
+ STBI_rgb = 3,
+ STBI_rgb_alpha = 4
+};
+
+#include <stdlib.h>
+typedef unsigned char stbi_uc;
+typedef unsigned short stbi_us;
+
+#ifdef __cplusplus
+extern "C" {+#endif
+
+#ifndef STBIDEF
+#ifdef STB_IMAGE_STATIC
+#define STBIDEF static
+#else
+#define STBIDEF extern
+#endif
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// PRIMARY API - works on images of any type
+//
+
+//
+// load image by filename, open file, or memory buffer
+//
+
+typedef struct {+ int (*read)(void* user, char* data,
+ int size); // fill 'data' with 'size' bytes. return number of
+ // bytes actually read
+ void (*skip)(void* user, int n); // skip the next 'n' bytes, or 'unget' the
+ // last -n bytes if negative
+ int (*eof)(void* user); // returns nonzero if we are at end of file/data
+} stbi_io_callbacks;
+
+////////////////////////////////////
+//
+// 8-bits-per-channel interface
+//
+
+STBIDEF stbi_uc* stbi_load_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* channels_in_file, int desired_channels);
+STBIDEF stbi_uc* stbi_load_from_callbacks(stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* channels_in_file, int desired_channels);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_uc* stbi_load(char const* filename, int* x, int* y, int* channels_in_file, int desired_channels);
+STBIDEF stbi_uc* stbi_load_from_file(FILE* f, int* x, int* y, int* channels_in_file, int desired_channels);
+// for stbi_load_from_file, file pointer is left pointing immediately after
+// image
+#endif
+
+#ifndef STBI_NO_GIF
+STBIDEF stbi_uc* stbi_load_gif_from_memory(stbi_uc const* buffer, int len, int** delays, int* x, int* y, int* z, int* comp, int req_comp);
+#endif
+
+#ifdef STBI_WINDOWS_UTF8
+STBIDEF int stbi_convert_wchar_to_utf8(char* buffer, size_t bufferlen, const wchar_t* input);
+#endif
+
+////////////////////////////////////
+//
+// 16-bits-per-channel interface
+//
+
+STBIDEF stbi_us* stbi_load_16_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* channels_in_file, int desired_channels);
+STBIDEF stbi_us* stbi_load_16_from_callbacks(stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* channels_in_file, int desired_channels);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_us* stbi_load_16(char const* filename, int* x, int* y, int* channels_in_file, int desired_channels);
+STBIDEF stbi_us* stbi_load_from_file_16(FILE* f, int* x, int* y, int* channels_in_file, int desired_channels);
+#endif
+
+////////////////////////////////////
+//
+// float-per-channel interface
+//
+#ifndef STBI_NO_LINEAR
+STBIDEF float* stbi_loadf_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* channels_in_file, int desired_channels);
+STBIDEF float* stbi_loadf_from_callbacks(stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* channels_in_file, int desired_channels);
+
+#ifndef STBI_NO_STDIO
+STBIDEF float* stbi_loadf(char const* filename, int* x, int* y, int* channels_in_file, int desired_channels);
+STBIDEF float* stbi_loadf_from_file(FILE* f, int* x, int* y, int* channels_in_file, int desired_channels);
+#endif
+#endif
+
+#ifndef STBI_NO_HDR
+STBIDEF void stbi_hdr_to_ldr_gamma(float gamma);
+STBIDEF void stbi_hdr_to_ldr_scale(float scale);
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_LINEAR
+STBIDEF void stbi_ldr_to_hdr_gamma(float gamma);
+STBIDEF void stbi_ldr_to_hdr_scale(float scale);
+#endif // STBI_NO_LINEAR
+
+// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
+STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const* clbk, void* user);
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const* buffer, int len);
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_is_hdr(char const* filename);
+STBIDEF int stbi_is_hdr_from_file(FILE* f);
+#endif // STBI_NO_STDIO
+
+// get a VERY brief reason for failure
+// on most compilers (and ALL modern mainstream compilers) this is threadsafe
+STBIDEF const char* stbi_failure_reason(void);
+
+// free the loaded image -- this is just free()
+STBIDEF void stbi_image_free(void* retval_from_stbi_load);
+
+// get image dimensions & components without fully decoding
+STBIDEF int stbi_info_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* comp);
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* comp);
+STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const* buffer, int len);
+STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const* clbk, void* user);
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_info(char const* filename, int* x, int* y, int* comp);
+STBIDEF int stbi_info_from_file(FILE* f, int* x, int* y, int* comp);
+STBIDEF int stbi_is_16_bit(char const* filename);
+STBIDEF int stbi_is_16_bit_from_file(FILE* f);
+#endif
+
+// for image formats that explicitly notate that they have premultiplied alpha,
+// we just return the colors as stored in the file. set this flag to force
+// unpremultiplication. results are undefined if the unpremultiply overflow.
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
+
+// indicate whether we should process iphone images back to canonical format,
+// or just pass them through "as-is"
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
+
+// flip the image vertically, so the first pixel in the output array is the
+// bottom left
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
+
+// as above, but only applies to images loaded on the thread that calls the
+// function this function is only available if your compiler supports
+// thread-local variables; calling it will fail to link if your compiler doesn't
+STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip);
+
+// ZLIB client - used by PNG, available for other purposes
+
+STBIDEF char* stbi_zlib_decode_malloc_guesssize(const char* buffer, int len, int initial_size, int* outlen);
+STBIDEF char* stbi_zlib_decode_malloc_guesssize_headerflag(const char* buffer, int len, int initial_size, int* outlen, int parse_header);
+STBIDEF char* stbi_zlib_decode_malloc(const char* buffer, int len, int* outlen);
+STBIDEF int stbi_zlib_decode_buffer(char* obuffer, int olen, const char* ibuffer, int ilen);
+
+STBIDEF char* stbi_zlib_decode_noheader_malloc(const char* buffer, int len, int* outlen);
+STBIDEF int stbi_zlib_decode_noheader_buffer(char* obuffer, int olen, const char* ibuffer, int ilen);
+
+#ifdef __cplusplus
+}
+#endif
+
+//
+//
+//// end header file /////////////////////////////////////////////////////
+#endif // STBI_INCLUDE_STB_IMAGE_H
+
+#ifdef STB_IMAGE_IMPLEMENTATION
+
+#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || \
+ defined(STBI_ONLY_PSD) || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) || defined(STBI_ONLY_ZLIB)
+#ifndef STBI_ONLY_JPEG
+#define STBI_NO_JPEG
+#endif
+#ifndef STBI_ONLY_PNG
+#define STBI_NO_PNG
+#endif
+#ifndef STBI_ONLY_BMP
+#define STBI_NO_BMP
+#endif
+#ifndef STBI_ONLY_PSD
+#define STBI_NO_PSD
+#endif
+#ifndef STBI_ONLY_TGA
+#define STBI_NO_TGA
+#endif
+#ifndef STBI_ONLY_GIF
+#define STBI_NO_GIF
+#endif
+#ifndef STBI_ONLY_HDR
+#define STBI_NO_HDR
+#endif
+#ifndef STBI_ONLY_PIC
+#define STBI_NO_PIC
+#endif
+#ifndef STBI_ONLY_PNM
+#define STBI_NO_PNM
+#endif
+#endif
+
+#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB)
+#define STBI_NO_ZLIB
+#endif
+
+#include <limits.h>
+#include <stdarg.h>
+#include <stddef.h> // ptrdiff_t on osx
+#include <stdlib.h>
+#include <string.h>
+
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+#include <math.h> // ldexp, pow
+#endif
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif
+
+#ifndef STBI_ASSERT
+#include <assert.h>
+#define STBI_ASSERT(x) assert(x)
+#endif
+
+#ifdef __cplusplus
+#define STBI_EXTERN extern "C"
+#else
+#define STBI_EXTERN extern
+#endif
+
+#ifndef _MSC_VER
+#ifdef __cplusplus
+#define stbi_inline inline
+#else
+#define stbi_inline
+#endif
+#else
+#define stbi_inline __forceinline
+#endif
+
+#ifndef STBI_NO_THREAD_LOCALS
+#if defined(__cplusplus) && __cplusplus >= 201103L
+#define STBI_THREAD_LOCAL thread_local
+#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+#define STBI_THREAD_LOCAL _Thread_local
+#elif defined(__GNUC__)
+#define STBI_THREAD_LOCAL __thread
+#elif defined(_MSC_VER)
+#define STBI_THREAD_LOCAL __declspec(thread)
+#endif
+#endif
+
+#ifdef _MSC_VER
+typedef unsigned short stbi__uint16;
+typedef signed short stbi__int16;
+typedef unsigned int stbi__uint32;
+typedef signed int stbi__int32;
+#else
+#include <stdint.h>
+typedef uint16_t stbi__uint16;
+typedef int16_t stbi__int16;
+typedef uint32_t stbi__uint32;
+typedef int32_t stbi__int32;
+#endif
+
+// should produce compiler error if size is wrong
+typedef unsigned char validate_uint32[sizeof(stbi__uint32) == 4 ? 1 : -1];
+
+#ifdef _MSC_VER
+#define STBI_NOTUSED(v) (void)(v)
+#else
+#define STBI_NOTUSED(v) (void)sizeof(v)
+#endif
+
+#ifdef _MSC_VER
+#define STBI_HAS_LROTL
+#endif
+
+#ifdef STBI_HAS_LROTL
+#define stbi_lrot(x, y) _lrotl(x, y)
+#else
+#define stbi_lrot(x, y) (((x) << (y)) | ((x) >> (32 - (y))))
+#endif
+
+#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
+// ok
+#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED)
+// ok
+#else
+#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
+#endif
+
+#ifndef STBI_MALLOC
+#define STBI_MALLOC(sz) malloc(sz)
+#define STBI_REALLOC(p, newsz) realloc(p, newsz)
+#define STBI_FREE(p) free(p)
+#endif
+
+#ifndef STBI_REALLOC_SIZED
+#define STBI_REALLOC_SIZED(p, oldsz, newsz) STBI_REALLOC(p, newsz)
+#endif
+
+// x86/x64 detection
+#if defined(__x86_64__) || defined(_M_X64)
+#define STBI__X64_TARGET
+#elif defined(__i386) || defined(_M_IX86)
+#define STBI__X86_TARGET
+#endif
+
+#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
+// gcc doesn't support sse2 intrinsics unless you compile with -msse2,
+// which in turn means it gets to use SSE2 everywhere. This is unfortunate,
+// but previous attempts to provide the SSE2 functions with runtime
+// detection caused numerous issues. The way architecture extensions are
+// exposed in GCC/Clang is, sadly, not really suited for one-file libs.
+// New behavior: if compiled with -msse2, we use SSE2 without any
+// detection; if not, we don't use it at all.
+#define STBI_NO_SIMD
+#endif
+
+#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD)
+// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid
+// STBI__X64_TARGET
+//
+// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the
+// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant.
+// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not
+// simultaneously enabling "-mstackrealign".
+//
+// See https://github.com/nothings/stb/issues/81 for more information.
+//
+// So default to no SSE2 on 32-bit MinGW. If you've read this far and added
+// -mstackrealign to your build settings, feel free to #define
+// STBI_MINGW_ENABLE_SSE2.
+#define STBI_NO_SIMD
+#endif
+
+#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET))
+#define STBI_SSE2
+#include <emmintrin.h>
+
+#ifdef _MSC_VER
+
+#if _MSC_VER >= 1400 // not VC6
+#include <intrin.h> // __cpuid
+static int stbi__cpuid3(void) {+ int info[4];
+ __cpuid(info, 1);
+ return info[3];
+}
+#else
+static int stbi__cpuid3(void) {+ int res;
+ __asm {+ mov eax,1
+ cpuid
+ mov res,edx
+ }
+ return res;
+}
+#endif
+
+#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
+
+#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
+static int stbi__sse2_available(void) {+ int info3 = stbi__cpuid3();
+ return ((info3 >> 26) & 1) != 0;
+}
+#endif
+
+#else // assume GCC-style if not VC++
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+
+#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
+static int stbi__sse2_available(void) {+ // If we're even attempting to compile this on GCC/Clang, that means
+ // -msse2 is on, which means the compiler is allowed to use SSE2
+ // instructions at will, and so are we.
+ return 1;
+}
+#endif
+
+#endif
+#endif
+
+// ARM NEON
+#if defined(STBI_NO_SIMD) && defined(STBI_NEON)
+#undef STBI_NEON
+#endif
+
+#ifdef STBI_NEON
+#include <arm_neon.h>
+// assume GCC or Clang on ARM targets
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+#endif
+
+#ifndef STBI_SIMD_ALIGN
+#define STBI_SIMD_ALIGN(type, name) type name
+#endif
+
+///////////////////////////////////////////////
+//
+// stbi__context struct and start_xxx functions
+
+// stbi__context structure is our basic context used by all images, so it
+// contains all the IO context, plus some basic image information
+typedef struct {+ stbi__uint32 img_x, img_y;
+ int img_n, img_out_n;
+
+ stbi_io_callbacks io;
+ void* io_user_data;
+
+ int read_from_callbacks;
+ int buflen;
+ stbi_uc buffer_start[128];
+
+ stbi_uc *img_buffer, *img_buffer_end;
+ stbi_uc *img_buffer_original, *img_buffer_original_end;
+} stbi__context;
+
+static void stbi__refill_buffer(stbi__context* s);
+
+// initialize a memory-decode context
+static void stbi__start_mem(stbi__context* s, stbi_uc const* buffer, int len) {+ s->io.read = NULL;
+ s->read_from_callbacks = 0;
+ s->img_buffer = s->img_buffer_original = (stbi_uc*)buffer;
+ s->img_buffer_end = s->img_buffer_original_end = (stbi_uc*)buffer + len;
+}
+
+// initialize a callback-based context
+static void stbi__start_callbacks(stbi__context* s, stbi_io_callbacks* c, void* user) {+ s->io = *c;
+ s->io_user_data = user;
+ s->buflen = sizeof(s->buffer_start);
+ s->read_from_callbacks = 1;
+ s->img_buffer_original = s->buffer_start;
+ stbi__refill_buffer(s);
+ s->img_buffer_original_end = s->img_buffer_end;
+}
+
+#ifndef STBI_NO_STDIO
+
+static int stbi__stdio_read(void* user, char* data, int size) { return (int)fread(data, 1, size, (FILE*)user); }+
+static void stbi__stdio_skip(void* user, int n) { fseek((FILE*)user, n, SEEK_CUR); }+
+static int stbi__stdio_eof(void* user) { return feof((FILE*)user); }+
+static stbi_io_callbacks stbi__stdio_callbacks = {+ stbi__stdio_read,
+ stbi__stdio_skip,
+ stbi__stdio_eof,
+};
+
+static void stbi__start_file(stbi__context* s, FILE* f) { stbi__start_callbacks(s, &stbi__stdio_callbacks, (void*)f); }+
+// static void stop_file(stbi__context *s) { }+
+#endif // !STBI_NO_STDIO
+
+static void stbi__rewind(stbi__context* s) {+ // conceptually rewind SHOULD rewind to the beginning of the stream,
+ // but we just rewind to the beginning of the initial buffer, because
+ // we only use it after doing 'test', which only ever looks at at most 92
+ // bytes
+ s->img_buffer = s->img_buffer_original;
+ s->img_buffer_end = s->img_buffer_original_end;
+}
+
+enum { STBI_ORDER_RGB, STBI_ORDER_BGR };+
+typedef struct {+ int bits_per_channel;
+ int num_channels;
+ int channel_order;
+} stbi__result_info;
+
+#ifndef STBI_NO_JPEG
+static int stbi__jpeg_test(stbi__context* s);
+static void* stbi__jpeg_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri);
+static int stbi__jpeg_info(stbi__context* s, int* x, int* y, int* comp);
+#endif
+
+#ifndef STBI_NO_PNG
+static int stbi__png_test(stbi__context* s);
+static void* stbi__png_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri);
+static int stbi__png_info(stbi__context* s, int* x, int* y, int* comp);
+static int stbi__png_is16(stbi__context* s);
+#endif
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_test(stbi__context* s);
+static void* stbi__bmp_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri);
+static int stbi__bmp_info(stbi__context* s, int* x, int* y, int* comp);
+#endif
+
+#ifndef STBI_NO_TGA
+static int stbi__tga_test(stbi__context* s);
+static void* stbi__tga_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri);
+static int stbi__tga_info(stbi__context* s, int* x, int* y, int* comp);
+#endif
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_test(stbi__context* s);
+static void* stbi__psd_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri, int bpc);
+static int stbi__psd_info(stbi__context* s, int* x, int* y, int* comp);
+static int stbi__psd_is16(stbi__context* s);
+#endif
+
+#ifndef STBI_NO_HDR
+static int stbi__hdr_test(stbi__context* s);
+static float* stbi__hdr_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri);
+static int stbi__hdr_info(stbi__context* s, int* x, int* y, int* comp);
+#endif
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_test(stbi__context* s);
+static void* stbi__pic_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri);
+static int stbi__pic_info(stbi__context* s, int* x, int* y, int* comp);
+#endif
+
+#ifndef STBI_NO_GIF
+static int stbi__gif_test(stbi__context* s);
+static void* stbi__gif_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri);
+static void* stbi__load_gif_main(stbi__context* s, int** delays, int* x, int* y, int* z, int* comp, int req_comp);
+static int stbi__gif_info(stbi__context* s, int* x, int* y, int* comp);
+#endif
+
+#ifndef STBI_NO_PNM
+static int stbi__pnm_test(stbi__context* s);
+static void* stbi__pnm_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri);
+static int stbi__pnm_info(stbi__context* s, int* x, int* y, int* comp);
+#endif
+
+static
+#ifdef STBI_THREAD_LOCAL
+ STBI_THREAD_LOCAL
+#endif
+ const char* stbi__g_failure_reason;
+
+STBIDEF const char* stbi_failure_reason(void) { return stbi__g_failure_reason; }+
+#ifndef STBI_NO_FAILURE_STRINGS
+static int stbi__err(const char* str) {+ stbi__g_failure_reason = str;
+ return 0;
+}
+#endif
+
+static void* stbi__malloc(size_t size) { return STBI_MALLOC(size); }+
+// stb_image uses ints pervasively, including for offset calculations.
+// therefore the largest decoded image size we can support with the
+// current code, even on 64-bit targets, is INT_MAX. this is not a
+// significant limitation for the intended use case.
+//
+// we do, however, need to make sure our size calculations don't
+// overflow. hence a few helper functions for size calculations that
+// multiply integers together, making sure that they're non-negative
+// and no overflow occurs.
+
+// return 1 if the sum is valid, 0 on overflow.
+// negative terms are considered invalid.
+static int stbi__addsizes_valid(int a, int b) {+ if (b < 0)
+ return 0;
+ // now 0 <= b <= INT_MAX, hence also
+ // 0 <= INT_MAX - b <= INTMAX.
+ // And "a + b <= INT_MAX" (which might overflow) is the
+ // same as a <= INT_MAX - b (no overflow)
+ return a <= INT_MAX - b;
+}
+
+// returns 1 if the product is valid, 0 on overflow.
+// negative factors are considered invalid.
+static int stbi__mul2sizes_valid(int a, int b) {+ if (a < 0 || b < 0)
+ return 0;
+ if (b == 0)
+ return 1; // mul-by-0 is always safe
+ // portable way to check for no overflows in a*b
+ return a <= INT_MAX / b;
+}
+
+#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR)
+// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow
+static int stbi__mad2sizes_valid(int a, int b, int add) { return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a * b, add); }+#endif
+
+// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow
+static int stbi__mad3sizes_valid(int a, int b, int c, int add) {+ return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a * b, c) && stbi__addsizes_valid(a * b * c, add);
+}
+
+// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't
+// overflow
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add) {+ return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a * b, c) && stbi__mul2sizes_valid(a * b * c, d) && stbi__addsizes_valid(a * b * c * d, add);
+}
+#endif
+
+#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR)
+// mallocs with size overflow checking
+static void* stbi__malloc_mad2(int a, int b, int add) {+ if (!stbi__mad2sizes_valid(a, b, add))
+ return NULL;
+ return stbi__malloc(a * b + add);
+}
+#endif
+
+static void* stbi__malloc_mad3(int a, int b, int c, int add) {+ if (!stbi__mad3sizes_valid(a, b, c, add))
+ return NULL;
+ return stbi__malloc(a * b * c + add);
+}
+
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+static void* stbi__malloc_mad4(int a, int b, int c, int d, int add) {+ if (!stbi__mad4sizes_valid(a, b, c, d, add))
+ return NULL;
+ return stbi__malloc(a * b * c * d + add);
+}
+#endif
+
+// stbi__err - error
+// stbi__errpf - error returning pointer to float
+// stbi__errpuc - error returning pointer to unsigned char
+
+#ifdef STBI_NO_FAILURE_STRINGS
+#define stbi__err(x, y) 0
+#elif defined(STBI_FAILURE_USERMSG)
+#define stbi__err(x, y) stbi__err(y)
+#else
+#define stbi__err(x, y) stbi__err(x)
+#endif
+
+#define stbi__errpf(x, y) ((float*)(size_t)(stbi__err(x, y) ? NULL : NULL))
+#define stbi__errpuc(x, y) ((unsigned char*)(size_t)(stbi__err(x, y) ? NULL : NULL))
+
+STBIDEF void stbi_image_free(void* retval_from_stbi_load) { STBI_FREE(retval_from_stbi_load); }+
+#ifndef STBI_NO_LINEAR
+static float* stbi__ldr_to_hdr(stbi_uc* data, int x, int y, int comp);
+#endif
+
+#ifndef STBI_NO_HDR
+static stbi_uc* stbi__hdr_to_ldr(float* data, int x, int y, int comp);
+#endif
+
+static int stbi__vertically_flip_on_load_global = 0;
+
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip) { stbi__vertically_flip_on_load_global = flag_true_if_should_flip; }+
+#ifndef STBI_THREAD_LOCAL
+#define stbi__vertically_flip_on_load stbi__vertically_flip_on_load_global
+#else
+static STBI_THREAD_LOCAL int stbi__vertically_flip_on_load_local, stbi__vertically_flip_on_load_set;
+
+STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip) {+ stbi__vertically_flip_on_load_local = flag_true_if_should_flip;
+ stbi__vertically_flip_on_load_set = 1;
+}
+
+#define stbi__vertically_flip_on_load (stbi__vertically_flip_on_load_set ? stbi__vertically_flip_on_load_local : stbi__vertically_flip_on_load_global)
+#endif // STBI_THREAD_LOCAL
+
+static void* stbi__load_main(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri, int bpc) {+ memset(ri, 0,
+ sizeof(*ri)); // make sure it's initialized if we add new fields
+ ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed
+ ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here
+ // so we can add BGR order
+ ri->num_channels = 0;
+
+#ifndef STBI_NO_JPEG
+ if (stbi__jpeg_test(s))
+ return stbi__jpeg_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_PNG
+ if (stbi__png_test(s))
+ return stbi__png_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_BMP
+ if (stbi__bmp_test(s))
+ return stbi__bmp_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_GIF
+ if (stbi__gif_test(s))
+ return stbi__gif_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_PSD
+ if (stbi__psd_test(s))
+ return stbi__psd_load(s, x, y, comp, req_comp, ri, bpc);
+#else
+ STBI_NOTUSED(bpc);
+#endif
+#ifndef STBI_NO_PIC
+ if (stbi__pic_test(s))
+ return stbi__pic_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_PNM
+ if (stbi__pnm_test(s))
+ return stbi__pnm_load(s, x, y, comp, req_comp, ri);
+#endif
+
+#ifndef STBI_NO_HDR
+ if (stbi__hdr_test(s)) {+ float* hdr = stbi__hdr_load(s, x, y, comp, req_comp, ri);
+ return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
+ }
+#endif
+
+#ifndef STBI_NO_TGA
+ // test tga last because it's a crappy test!
+ if (stbi__tga_test(s))
+ return stbi__tga_load(s, x, y, comp, req_comp, ri);
+#endif
+
+ return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");+}
+
+static stbi_uc* stbi__convert_16_to_8(stbi__uint16* orig, int w, int h, int channels) {+ int i;
+ int img_len = w * h * channels;
+ stbi_uc* reduced;
+
+ reduced = (stbi_uc*)stbi__malloc(img_len);
+ if (reduced == NULL)
+ return stbi__errpuc("outofmem", "Out of memory");+
+ for (i = 0; i < img_len; ++i)
+ reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient
+ // approx of 16->8 bit scaling
+
+ STBI_FREE(orig);
+ return reduced;
+}
+
+static stbi__uint16* stbi__convert_8_to_16(stbi_uc* orig, int w, int h, int channels) {+ int i;
+ int img_len = w * h * channels;
+ stbi__uint16* enlarged;
+
+ enlarged = (stbi__uint16*)stbi__malloc(img_len * 2);
+ if (enlarged == NULL)
+ return (stbi__uint16*)stbi__errpuc("outofmem", "Out of memory");+
+ for (i = 0; i < img_len; ++i)
+ enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff
+
+ STBI_FREE(orig);
+ return enlarged;
+}
+
+static void stbi__vertical_flip(void* image, int w, int h, int bytes_per_pixel) {+ int row;
+ size_t bytes_per_row = (size_t)w * bytes_per_pixel;
+ stbi_uc temp[2048];
+ stbi_uc* bytes = (stbi_uc*)image;
+
+ for (row = 0; row < (h >> 1); row++) {+ stbi_uc* row0 = bytes + row * bytes_per_row;
+ stbi_uc* row1 = bytes + (h - row - 1) * bytes_per_row;
+ // swap row0 with row1
+ size_t bytes_left = bytes_per_row;
+ while (bytes_left) {+ size_t bytes_copy = (bytes_left < sizeof(temp)) ? bytes_left : sizeof(temp);
+ memcpy(temp, row0, bytes_copy);
+ memcpy(row0, row1, bytes_copy);
+ memcpy(row1, temp, bytes_copy);
+ row0 += bytes_copy;
+ row1 += bytes_copy;
+ bytes_left -= bytes_copy;
+ }
+ }
+}
+
+#ifndef STBI_NO_GIF
+static void stbi__vertical_flip_slices(void* image, int w, int h, int z, int bytes_per_pixel) {+ int slice;
+ int slice_size = w * h * bytes_per_pixel;
+
+ stbi_uc* bytes = (stbi_uc*)image;
+ for (slice = 0; slice < z; ++slice) {+ stbi__vertical_flip(bytes, w, h, bytes_per_pixel);
+ bytes += slice_size;
+ }
+}
+#endif
+
+static unsigned char* stbi__load_and_postprocess_8bit(stbi__context* s, int* x, int* y, int* comp, int req_comp) {+ stbi__result_info ri;
+ void* result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8);
+
+ if (result == NULL)
+ return NULL;
+
+ if (ri.bits_per_channel != 8) {+ STBI_ASSERT(ri.bits_per_channel == 16);
+ result = stbi__convert_16_to_8((stbi__uint16*)result, *x, *y, req_comp == 0 ? *comp : req_comp);
+ ri.bits_per_channel = 8;
+ }
+
+ // @TODO: move stbi__convert_format to here
+
+ if (stbi__vertically_flip_on_load) {+ int channels = req_comp ? req_comp : *comp;
+ stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi_uc));
+ }
+
+ return (unsigned char*)result;
+}
+
+static stbi__uint16* stbi__load_and_postprocess_16bit(stbi__context* s, int* x, int* y, int* comp, int req_comp) {+ stbi__result_info ri;
+ void* result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16);
+
+ if (result == NULL)
+ return NULL;
+
+ if (ri.bits_per_channel != 16) {+ STBI_ASSERT(ri.bits_per_channel == 8);
+ result = stbi__convert_8_to_16((stbi_uc*)result, *x, *y, req_comp == 0 ? *comp : req_comp);
+ ri.bits_per_channel = 16;
+ }
+
+ // @TODO: move stbi__convert_format16 to here
+ // @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to
+ // keep more precision
+
+ if (stbi__vertically_flip_on_load) {+ int channels = req_comp ? req_comp : *comp;
+ stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi__uint16));
+ }
+
+ return (stbi__uint16*)result;
+}
+
+#if !defined(STBI_NO_HDR) && !defined(STBI_NO_LINEAR)
+static void stbi__float_postprocess(float* result, int* x, int* y, int* comp, int req_comp) {+ if (stbi__vertically_flip_on_load && result != NULL) {+ int channels = req_comp ? req_comp : *comp;
+ stbi__vertical_flip(result, *x, *y, channels * sizeof(float));
+ }
+}
+#endif
+
+#ifndef STBI_NO_STDIO
+
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+STBI_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char* str, int cbmb, wchar_t* widestr,
+ int cchwide);
+STBI_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t* widestr, int cchwide, char* str,
+ int cbmb, const char* defchar, int* used_default);
+#endif
+
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+STBIDEF int stbi_convert_wchar_to_utf8(char* buffer, size_t bufferlen, const wchar_t* input) {+ return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int)bufferlen, NULL, NULL);
+}
+#endif
+
+static FILE* stbi__fopen(char const* filename, char const* mode) {+ FILE* f;
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+ wchar_t wMode[64];
+ wchar_t wFilename[1024];
+ if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)))
+ return 0;
+
+ if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)))
+ return 0;
+
+#if _MSC_VER >= 1400
+ if (0 != _wfopen_s(&f, wFilename, wMode))
+ f = 0;
+#else
+ f = _wfopen(wFilename, wMode);
+#endif
+
+#elif defined(_MSC_VER) && _MSC_VER >= 1400
+ if (0 != fopen_s(&f, filename, mode))
+ f = 0;
+#else
+ f = fopen(filename, mode);
+#endif
+ return f;
+}
+
+STBIDEF stbi_uc* stbi_load(char const* filename, int* x, int* y, int* comp, int req_comp) {+ FILE* f = stbi__fopen(filename, "rb");
+ unsigned char* result;
+ if (!f)
+ return stbi__errpuc("can't fopen", "Unable to open file");+ result = stbi_load_from_file(f, x, y, comp, req_comp);
+ fclose(f);
+ return result;
+}
+
+STBIDEF stbi_uc* stbi_load_from_file(FILE* f, int* x, int* y, int* comp, int req_comp) {+ unsigned char* result;
+ stbi__context s;
+ stbi__start_file(&s, f);
+ result = stbi__load_and_postprocess_8bit(&s, x, y, comp, req_comp);
+ if (result) {+ // need to 'unget' all the characters in the IO buffer
+ fseek(f, -(int)(s.img_buffer_end - s.img_buffer), SEEK_CUR);
+ }
+ return result;
+}
+
+STBIDEF stbi__uint16* stbi_load_from_file_16(FILE* f, int* x, int* y, int* comp, int req_comp) {+ stbi__uint16* result;
+ stbi__context s;
+ stbi__start_file(&s, f);
+ result = stbi__load_and_postprocess_16bit(&s, x, y, comp, req_comp);
+ if (result) {+ // need to 'unget' all the characters in the IO buffer
+ fseek(f, -(int)(s.img_buffer_end - s.img_buffer), SEEK_CUR);
+ }
+ return result;
+}
+
+STBIDEF stbi_us* stbi_load_16(char const* filename, int* x, int* y, int* comp, int req_comp) {+ FILE* f = stbi__fopen(filename, "rb");
+ stbi__uint16* result;
+ if (!f)
+ return (stbi_us*)stbi__errpuc("can't fopen", "Unable to open file");+ result = stbi_load_from_file_16(f, x, y, comp, req_comp);
+ fclose(f);
+ return result;
+}
+
+#endif //! STBI_NO_STDIO
+
+STBIDEF stbi_us* stbi_load_16_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* channels_in_file, int desired_channels) {+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__load_and_postprocess_16bit(&s, x, y, channels_in_file, desired_channels);
+}
+
+STBIDEF stbi_us* stbi_load_16_from_callbacks(stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* channels_in_file, int desired_channels) {+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks*)clbk, user);
+ return stbi__load_and_postprocess_16bit(&s, x, y, channels_in_file, desired_channels);
+}
+
+STBIDEF stbi_uc* stbi_load_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* comp, int req_comp) {+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__load_and_postprocess_8bit(&s, x, y, comp, req_comp);
+}
+
+STBIDEF stbi_uc* stbi_load_from_callbacks(stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* comp, int req_comp) {+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks*)clbk, user);
+ return stbi__load_and_postprocess_8bit(&s, x, y, comp, req_comp);
+}
+
+#ifndef STBI_NO_GIF
+STBIDEF stbi_uc* stbi_load_gif_from_memory(stbi_uc const* buffer, int len, int** delays, int* x, int* y, int* z, int* comp, int req_comp) {+ unsigned char* result;
+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+
+ result = (unsigned char*)stbi__load_gif_main(&s, delays, x, y, z, comp, req_comp);
+ if (stbi__vertically_flip_on_load) {+ stbi__vertical_flip_slices(result, *x, *y, *z, *comp);
+ }
+
+ return result;
+}
+#endif
+
+#ifndef STBI_NO_LINEAR
+static float* stbi__loadf_main(stbi__context* s, int* x, int* y, int* comp, int req_comp) {+ unsigned char* data;
+#ifndef STBI_NO_HDR
+ if (stbi__hdr_test(s)) {+ stbi__result_info ri;
+ float* hdr_data = stbi__hdr_load(s, x, y, comp, req_comp, &ri);
+ if (hdr_data)
+ stbi__float_postprocess(hdr_data, x, y, comp, req_comp);
+ return hdr_data;
+ }
+#endif
+ data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp);
+ if (data)
+ return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
+ return stbi__errpf("unknown image type", "Image not of any known type, or corrupt");+}
+
+STBIDEF float* stbi_loadf_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* comp, int req_comp) {+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__loadf_main(&s, x, y, comp, req_comp);
+}
+
+STBIDEF float* stbi_loadf_from_callbacks(stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* comp, int req_comp) {+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks*)clbk, user);
+ return stbi__loadf_main(&s, x, y, comp, req_comp);
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF float* stbi_loadf(char const* filename, int* x, int* y, int* comp, int req_comp) {+ float* result;
+ FILE* f = stbi__fopen(filename, "rb");
+ if (!f)
+ return stbi__errpf("can't fopen", "Unable to open file");+ result = stbi_loadf_from_file(f, x, y, comp, req_comp);
+ fclose(f);
+ return result;
+}
+
+STBIDEF float* stbi_loadf_from_file(FILE* f, int* x, int* y, int* comp, int req_comp) {+ stbi__context s;
+ stbi__start_file(&s, f);
+ return stbi__loadf_main(&s, x, y, comp, req_comp);
+}
+#endif // !STBI_NO_STDIO
+
+#endif // !STBI_NO_LINEAR
+
+// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is
+// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always
+// reports false!
+
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const* buffer, int len) {+#ifndef STBI_NO_HDR
+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__hdr_test(&s);
+#else
+ STBI_NOTUSED(buffer);
+ STBI_NOTUSED(len);
+ return 0;
+#endif
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_is_hdr(char const* filename) {+ FILE* f = stbi__fopen(filename, "rb");
+ int result = 0;
+ if (f) {+ result = stbi_is_hdr_from_file(f);
+ fclose(f);
+ }
+ return result;
+}
+
+STBIDEF int stbi_is_hdr_from_file(FILE* f) {+#ifndef STBI_NO_HDR
+ long pos = ftell(f);
+ int res;
+ stbi__context s;
+ stbi__start_file(&s, f);
+ res = stbi__hdr_test(&s);
+ fseek(f, pos, SEEK_SET);
+ return res;
+#else
+ STBI_NOTUSED(f);
+ return 0;
+#endif
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const* clbk, void* user) {+#ifndef STBI_NO_HDR
+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks*)clbk, user);
+ return stbi__hdr_test(&s);
+#else
+ STBI_NOTUSED(clbk);
+ STBI_NOTUSED(user);
+ return 0;
+#endif
+}
+
+#ifndef STBI_NO_LINEAR
+static float stbi__l2h_gamma = 2.2f, stbi__l2h_scale = 1.0f;
+
+STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }+STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }+#endif
+
+static float stbi__h2l_gamma_i = 1.0f / 2.2f, stbi__h2l_scale_i = 1.0f;
+
+STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1 / gamma; }+STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1 / scale; }+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Common code used by all image loaders
+//
+
+enum { STBI__SCAN_load = 0, STBI__SCAN_type, STBI__SCAN_header };+
+static void stbi__refill_buffer(stbi__context* s) {+ int n = (s->io.read)(s->io_user_data, (char*)s->buffer_start, s->buflen);
+ if (n == 0) {+ // at end of file, treat same as if from memory, but need to handle case
+ // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
+ s->read_from_callbacks = 0;
+ s->img_buffer = s->buffer_start;
+ s->img_buffer_end = s->buffer_start + 1;
+ *s->img_buffer = 0;
+ } else {+ s->img_buffer = s->buffer_start;
+ s->img_buffer_end = s->buffer_start + n;
+ }
+}
+
+stbi_inline static stbi_uc stbi__get8(stbi__context* s) {+ if (s->img_buffer < s->img_buffer_end)
+ return *s->img_buffer++;
+ if (s->read_from_callbacks) {+ stbi__refill_buffer(s);
+ return *s->img_buffer++;
+ }
+ return 0;
+}
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_HDR) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+stbi_inline static int stbi__at_eof(stbi__context* s) {+ if (s->io.read) {+ if (!(s->io.eof)(s->io_user_data))
+ return 0;
+ // if feof() is true, check if buffer = end
+ // special case: we've only got the special 0 character at the end
+ if (s->read_from_callbacks == 0)
+ return 1;
+ }
+
+ return s->img_buffer >= s->img_buffer_end;
+}
+#endif
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && \
+ defined(STBI_NO_PIC)
+// nothing
+#else
+static void stbi__skip(stbi__context* s, int n) {+ if (n < 0) {+ s->img_buffer = s->img_buffer_end;
+ return;
+ }
+ if (s->io.read) {+ int blen = (int)(s->img_buffer_end - s->img_buffer);
+ if (blen < n) {+ s->img_buffer = s->img_buffer_end;
+ (s->io.skip)(s->io_user_data, n - blen);
+ return;
+ }
+ }
+ s->img_buffer += n;
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_TGA) && defined(STBI_NO_HDR) && defined(STBI_NO_PNM)
+// nothing
+#else
+static int stbi__getn(stbi__context* s, stbi_uc* buffer, int n) {+ if (s->io.read) {+ int blen = (int)(s->img_buffer_end - s->img_buffer);
+ if (blen < n) {+ int res, count;
+
+ memcpy(buffer, s->img_buffer, blen);
+
+ count = (s->io.read)(s->io_user_data, (char*)buffer + blen, n - blen);
+ res = (count == (n - blen));
+ s->img_buffer = s->img_buffer_end;
+ return res;
+ }
+ }
+
+ if (s->img_buffer + n <= s->img_buffer_end) {+ memcpy(buffer, s->img_buffer, n);
+ s->img_buffer += n;
+ return 1;
+ } else
+ return 0;
+}
+#endif
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC)
+// nothing
+#else
+static int stbi__get16be(stbi__context* s) {+ int z = stbi__get8(s);
+ return (z << 8) + stbi__get8(s);
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC)
+// nothing
+#else
+static stbi__uint32 stbi__get32be(stbi__context* s) {+ stbi__uint32 z = stbi__get16be(s);
+ return (z << 16) + stbi__get16be(s);
+}
+#endif
+
+#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF)
+// nothing
+#else
+static int stbi__get16le(stbi__context* s) {+ int z = stbi__get8(s);
+ return z + (stbi__get8(s) << 8);
+}
+#endif
+
+#ifndef STBI_NO_BMP
+static stbi__uint32 stbi__get32le(stbi__context* s) {+ stbi__uint32 z = stbi__get16le(s);
+ return z + (stbi__get16le(s) << 16);
+}
+#endif
+
+#define STBI__BYTECAST(x) ((stbi_uc)((x)&255)) // truncate int to byte without warnings
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && \
+ defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+//////////////////////////////////////////////////////////////////////////////
+//
+// generic converter from built-in img_n to req_comp
+// individual types do this automatically as much as possible (e.g. jpeg
+// does all cases internally since it needs to colorspace convert anyway,
+// and it never has alpha, so very few cases ). png can automatically
+// interleave an alpha=255 channel, but falls back to this for other cases
+//
+// assume data buffer is malloced, so malloc a new one and free that one
+// only failure mode is malloc failing
+
+static stbi_uc stbi__compute_y(int r, int g, int b) { return (stbi_uc)(((r * 77) + (g * 150) + (29 * b)) >> 8); }+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && \
+ defined(STBI_NO_PNM)
+// nothing
+#else
+static unsigned char* stbi__convert_format(unsigned char* data, int img_n, int req_comp, unsigned int x, unsigned int y) {+ int i, j;
+ unsigned char* good;
+
+ if (req_comp == img_n)
+ return data;
+ STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+ good = (unsigned char*)stbi__malloc_mad3(req_comp, x, y, 0);
+ if (good == NULL) {+ STBI_FREE(data);
+ return stbi__errpuc("outofmem", "Out of memory");+ }
+
+ for (j = 0; j < (int)y; ++j) {+ unsigned char* src = data + j * x * img_n;
+ unsigned char* dest = good + j * x * req_comp;
+
+#define STBI__COMBO(a, b) ((a)*8 + (b))
+#define STBI__CASE(a, b) \
+ case STBI__COMBO(a, b): \
+ for (i = x - 1; i >= 0; --i, src += a, dest += b)
+ // convert source image with img_n components to one with req_comp
+ // components; avoid switch per pixel, so use switch per scanline and
+ // massive macros
+ switch (STBI__COMBO(img_n, req_comp)) {+ STBI__CASE(1, 2) {+ dest[0] = src[0];
+ dest[1] = 255;
+ }
+ break;
+ STBI__CASE(1, 3) { dest[0] = dest[1] = dest[2] = src[0]; }+ break;
+ STBI__CASE(1, 4) {+ dest[0] = dest[1] = dest[2] = src[0];
+ dest[3] = 255;
+ }
+ break;
+ STBI__CASE(2, 1) { dest[0] = src[0]; }+ break;
+ STBI__CASE(2, 3) { dest[0] = dest[1] = dest[2] = src[0]; }+ break;
+ STBI__CASE(2, 4) {+ dest[0] = dest[1] = dest[2] = src[0];
+ dest[3] = src[1];
+ }
+ break;
+ STBI__CASE(3, 4) {+ dest[0] = src[0];
+ dest[1] = src[1];
+ dest[2] = src[2];
+ dest[3] = 255;
+ }
+ break;
+ STBI__CASE(3, 1) { dest[0] = stbi__compute_y(src[0], src[1], src[2]); }+ break;
+ STBI__CASE(3, 2) {+ dest[0] = stbi__compute_y(src[0], src[1], src[2]);
+ dest[1] = 255;
+ }
+ break;
+ STBI__CASE(4, 1) { dest[0] = stbi__compute_y(src[0], src[1], src[2]); }+ break;
+ STBI__CASE(4, 2) {+ dest[0] = stbi__compute_y(src[0], src[1], src[2]);
+ dest[1] = src[3];
+ }
+ break;
+ STBI__CASE(4, 3) {+ dest[0] = src[0];
+ dest[1] = src[1];
+ dest[2] = src[2];
+ }
+ break;
+ default:
+ STBI_ASSERT(0);
+ }
+#undef STBI__CASE
+ }
+
+ STBI_FREE(data);
+ return good;
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD)
+// nothing
+#else
+static stbi__uint16 stbi__compute_y_16(int r, int g, int b) { return (stbi__uint16)(((r * 77) + (g * 150) + (29 * b)) >> 8); }+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD)
+// nothing
+#else
+static stbi__uint16* stbi__convert_format16(stbi__uint16* data, int img_n, int req_comp, unsigned int x, unsigned int y) {+ int i, j;
+ stbi__uint16* good;
+
+ if (req_comp == img_n)
+ return data;
+ STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+ good = (stbi__uint16*)stbi__malloc(req_comp * x * y * 2);
+ if (good == NULL) {+ STBI_FREE(data);
+ return (stbi__uint16*)stbi__errpuc("outofmem", "Out of memory");+ }
+
+ for (j = 0; j < (int)y; ++j) {+ stbi__uint16* src = data + j * x * img_n;
+ stbi__uint16* dest = good + j * x * req_comp;
+
+#define STBI__COMBO(a, b) ((a)*8 + (b))
+#define STBI__CASE(a, b) \
+ case STBI__COMBO(a, b): \
+ for (i = x - 1; i >= 0; --i, src += a, dest += b)
+ // convert source image with img_n components to one with req_comp
+ // components; avoid switch per pixel, so use switch per scanline and
+ // massive macros
+ switch (STBI__COMBO(img_n, req_comp)) {+ STBI__CASE(1, 2) {+ dest[0] = src[0];
+ dest[1] = 0xffff;
+ }
+ break;
+ STBI__CASE(1, 3) { dest[0] = dest[1] = dest[2] = src[0]; }+ break;
+ STBI__CASE(1, 4) {+ dest[0] = dest[1] = dest[2] = src[0];
+ dest[3] = 0xffff;
+ }
+ break;
+ STBI__CASE(2, 1) { dest[0] = src[0]; }+ break;
+ STBI__CASE(2, 3) { dest[0] = dest[1] = dest[2] = src[0]; }+ break;
+ STBI__CASE(2, 4) {+ dest[0] = dest[1] = dest[2] = src[0];
+ dest[3] = src[1];
+ }
+ break;
+ STBI__CASE(3, 4) {+ dest[0] = src[0];
+ dest[1] = src[1];
+ dest[2] = src[2];
+ dest[3] = 0xffff;
+ }
+ break;
+ STBI__CASE(3, 1) { dest[0] = stbi__compute_y_16(src[0], src[1], src[2]); }+ break;
+ STBI__CASE(3, 2) {+ dest[0] = stbi__compute_y_16(src[0], src[1], src[2]);
+ dest[1] = 0xffff;
+ }
+ break;
+ STBI__CASE(4, 1) { dest[0] = stbi__compute_y_16(src[0], src[1], src[2]); }+ break;
+ STBI__CASE(4, 2) {+ dest[0] = stbi__compute_y_16(src[0], src[1], src[2]);
+ dest[1] = src[3];
+ }
+ break;
+ STBI__CASE(4, 3) {+ dest[0] = src[0];
+ dest[1] = src[1];
+ dest[2] = src[2];
+ }
+ break;
+ default:
+ STBI_ASSERT(0);
+ }
+#undef STBI__CASE
+ }
+
+ STBI_FREE(data);
+ return good;
+}
+#endif
+
+#ifndef STBI_NO_LINEAR
+static float* stbi__ldr_to_hdr(stbi_uc* data, int x, int y, int comp) {+ int i, k, n;
+ float* output;
+ if (!data)
+ return NULL;
+ output = (float*)stbi__malloc_mad4(x, y, comp, sizeof(float), 0);
+ if (output == NULL) {+ STBI_FREE(data);
+ return stbi__errpf("outofmem", "Out of memory");+ }
+ // compute number of non-alpha components
+ if (comp & 1)
+ n = comp;
+ else
+ n = comp - 1;
+ for (i = 0; i < x * y; ++i) {+ for (k = 0; k < n; ++k) {+ output[i * comp + k] = (float)(pow(data[i * comp + k] / 255.0f, stbi__l2h_gamma) * stbi__l2h_scale);
+ }
+ }
+ if (n < comp) {+ for (i = 0; i < x * y; ++i) {+ output[i * comp + n] = data[i * comp + n] / 255.0f;
+ }
+ }
+ STBI_FREE(data);
+ return output;
+}
+#endif
+
+#ifndef STBI_NO_HDR
+#define stbi__float2int(x) ((int)(x))
+static stbi_uc* stbi__hdr_to_ldr(float* data, int x, int y, int comp) {+ int i, k, n;
+ stbi_uc* output;
+ if (!data)
+ return NULL;
+ output = (stbi_uc*)stbi__malloc_mad3(x, y, comp, 0);
+ if (output == NULL) {+ STBI_FREE(data);
+ return stbi__errpuc("outofmem", "Out of memory");+ }
+ // compute number of non-alpha components
+ if (comp & 1)
+ n = comp;
+ else
+ n = comp - 1;
+ for (i = 0; i < x * y; ++i) {+ for (k = 0; k < n; ++k) {+ float z = (float)pow(data[i * comp + k] * stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f;
+ if (z < 0)
+ z = 0;
+ if (z > 255)
+ z = 255;
+ output[i * comp + k] = (stbi_uc)stbi__float2int(z);
+ }
+ if (k < comp) {+ float z = data[i * comp + k] * 255 + 0.5f;
+ if (z < 0)
+ z = 0;
+ if (z > 255)
+ z = 255;
+ output[i * comp + k] = (stbi_uc)stbi__float2int(z);
+ }
+ }
+ STBI_FREE(data);
+ return output;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// "baseline" JPEG/JFIF decoder
+//
+// simple implementation
+// - doesn't support delayed output of y-dimension
+// - simple interface (only one output format: 8-bit interleaved RGB)
+// - doesn't try to recover corrupt jpegs
+// - doesn't allow partial loading, loading multiple at once
+// - still fast on x86 (copying globals into locals doesn't help x86)
+// - allocates lots of intermediate memory (full size of all components)
+// - non-interleaved case requires this anyway
+// - allows good upsampling (see next)
+// high-quality
+// - upsampled channels are bilinearly interpolated, even across blocks
+// - quality integer IDCT derived from IJG's 'slow'
+// performance
+// - fast huffman; reasonable integer IDCT
+// - some SIMD kernels for common paths on targets with SSE2/NEON
+// - uses a lot of intermediate memory, could cache poorly
+
+#ifndef STBI_NO_JPEG
+
+// huffman decoding acceleration
+#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache
+
+typedef struct {+ stbi_uc fast[1 << FAST_BITS];
+ // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
+ stbi__uint16 code[256];
+ stbi_uc values[256];
+ stbi_uc size[257];
+ unsigned int maxcode[18];
+ int delta[17]; // old 'firstsymbol' - old 'firstcode'
+} stbi__huffman;
+
+typedef struct {+ stbi__context* s;
+ stbi__huffman huff_dc[4];
+ stbi__huffman huff_ac[4];
+ stbi__uint16 dequant[4][64];
+ stbi__int16 fast_ac[4][1 << FAST_BITS];
+
+ // sizes for components, interleaved MCUs
+ int img_h_max, img_v_max;
+ int img_mcu_x, img_mcu_y;
+ int img_mcu_w, img_mcu_h;
+
+ // definition of jpeg image component
+ struct {+ int id;
+ int h, v;
+ int tq;
+ int hd, ha;
+ int dc_pred;
+
+ int x, y, w2, h2;
+ stbi_uc* data;
+ void *raw_data, *raw_coeff;
+ stbi_uc* linebuf;
+ short* coeff; // progressive only
+ int coeff_w, coeff_h; // number of 8x8 coefficient blocks
+ } img_comp[4];
+
+ stbi__uint32 code_buffer; // jpeg entropy-coded buffer
+ int code_bits; // number of valid bits
+ unsigned char marker; // marker seen while filling entropy buffer
+ int nomore; // flag if we saw a marker so must stop
+
+ int progressive;
+ int spec_start;
+ int spec_end;
+ int succ_high;
+ int succ_low;
+ int eob_run;
+ int jfif;
+ int app14_color_transform; // Adobe APP14 tag
+ int rgb;
+
+ int scan_n, order[4];
+ int restart_interval, todo;
+
+ // kernels
+ void (*idct_block_kernel)(stbi_uc* out, int out_stride, short data[64]);
+ void (*YCbCr_to_RGB_kernel)(stbi_uc* out, const stbi_uc* y, const stbi_uc* pcb, const stbi_uc* pcr, int count, int step);
+ stbi_uc* (*resample_row_hv_2_kernel)(stbi_uc* out, stbi_uc* in_near, stbi_uc* in_far, int w, int hs);
+} stbi__jpeg;
+
+static int stbi__build_huffman(stbi__huffman* h, int* count) {+ int i, j, k = 0;
+ unsigned int code;
+ // build size list for each symbol (from JPEG spec)
+ for (i = 0; i < 16; ++i)
+ for (j = 0; j < count[i]; ++j)
+ h->size[k++] = (stbi_uc)(i + 1);
+ h->size[k] = 0;
+
+ // compute actual symbols (from jpeg spec)
+ code = 0;
+ k = 0;
+ for (j = 1; j <= 16; ++j) {+ // compute delta to add to code to compute symbol id
+ h->delta[j] = k - code;
+ if (h->size[k] == j) {+ while (h->size[k] == j)
+ h->code[k++] = (stbi__uint16)(code++);
+ if (code - 1 >= (1u << j))
+ return stbi__err("bad code lengths", "Corrupt JPEG");+ }
+ // compute largest code + 1 for this size, preshifted as needed later
+ h->maxcode[j] = code << (16 - j);
+ code <<= 1;
+ }
+ h->maxcode[j] = 0xffffffff;
+
+ // build non-spec acceleration table; 255 is flag for not-accelerated
+ memset(h->fast, 255, 1 << FAST_BITS);
+ for (i = 0; i < k; ++i) {+ int s = h->size[i];
+ if (s <= FAST_BITS) {+ int c = h->code[i] << (FAST_BITS - s);
+ int m = 1 << (FAST_BITS - s);
+ for (j = 0; j < m; ++j) {+ h->fast[c + j] = (stbi_uc)i;
+ }
+ }
+ }
+ return 1;
+}
+
+// build a table that decodes both magnitude and value of small ACs in
+// one go.
+static void stbi__build_fast_ac(stbi__int16* fast_ac, stbi__huffman* h) {+ int i;
+ for (i = 0; i < (1 << FAST_BITS); ++i) {+ stbi_uc fast = h->fast[i];
+ fast_ac[i] = 0;
+ if (fast < 255) {+ int rs = h->values[fast];
+ int run = (rs >> 4) & 15;
+ int magbits = rs & 15;
+ int len = h->size[fast];
+
+ if (magbits && len + magbits <= FAST_BITS) {+ // magnitude code followed by receive_extend code
+ int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits);
+ int m = 1 << (magbits - 1);
+ if (k < m)
+ k += (~0U << magbits) + 1;
+ // if the result is small enough, we can fit it in fast_ac table
+ if (k >= -128 && k <= 127)
+ fast_ac[i] = (stbi__int16)((k * 256) + (run * 16) + (len + magbits));
+ }
+ }
+ }
+}
+
+static void stbi__grow_buffer_unsafe(stbi__jpeg* j) {+ do {+ unsigned int b = j->nomore ? 0 : stbi__get8(j->s);
+ if (b == 0xff) {+ int c = stbi__get8(j->s);
+ while (c == 0xff)
+ c = stbi__get8(j->s); // consume fill bytes
+ if (c != 0) {+ j->marker = (unsigned char)c;
+ j->nomore = 1;
+ return;
+ }
+ }
+ j->code_buffer |= b << (24 - j->code_bits);
+ j->code_bits += 8;
+ } while (j->code_bits <= 24);
+}
+
+// (1 << n) - 1
+static const stbi__uint32 stbi__bmask[17] = {0, 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535};+
+// decode a jpeg huffman value from the bitstream
+stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg* j, stbi__huffman* h) {+ unsigned int temp;
+ int c, k;
+
+ if (j->code_bits < 16)
+ stbi__grow_buffer_unsafe(j);
+
+ // look at the top FAST_BITS and determine what symbol ID it is,
+ // if the code is <= FAST_BITS
+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS) - 1);
+ k = h->fast[c];
+ if (k < 255) {+ int s = h->size[k];
+ if (s > j->code_bits)
+ return -1;
+ j->code_buffer <<= s;
+ j->code_bits -= s;
+ return h->values[k];
+ }
+
+ // naive test is to shift the code_buffer down so k bits are
+ // valid, then test against maxcode. To speed this up, we've
+ // preshifted maxcode left so that it has (16-k) 0s at the
+ // end; in other words, regardless of the number of bits, it
+ // wants to be compared against something shifted to have 16;
+ // that way we don't need to shift inside the loop.
+ temp = j->code_buffer >> 16;
+ for (k = FAST_BITS + 1;; ++k)
+ if (temp < h->maxcode[k])
+ break;
+ if (k == 17) {+ // error! code not found
+ j->code_bits -= 16;
+ return -1;
+ }
+
+ if (k > j->code_bits)
+ return -1;
+
+ // convert the huffman code to the symbol id
+ c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
+ STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
+
+ // convert the id to a symbol
+ j->code_bits -= k;
+ j->code_buffer <<= k;
+ return h->values[c];
+}
+
+// bias[n] = (-1<<n) + 1
+static const int stbi__jbias[16] = {0, -1, -3, -7, -15, -31, -63, -127, -255, -511, -1023, -2047, -4095, -8191, -16383, -32767};+
+// combined JPEG 'receive' and JPEG 'extend', since baseline
+// always extends everything it receives.
+stbi_inline static int stbi__extend_receive(stbi__jpeg* j, int n) {+ unsigned int k;
+ int sgn;
+ if (j->code_bits < n)
+ stbi__grow_buffer_unsafe(j);
+
+ sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB
+ k = stbi_lrot(j->code_buffer, n);
+ STBI_ASSERT(n >= 0 && n < (int)(sizeof(stbi__bmask) / sizeof(*stbi__bmask)));
+ j->code_buffer = k & ~stbi__bmask[n];
+ k &= stbi__bmask[n];
+ j->code_bits -= n;
+ return k + (stbi__jbias[n] & ~sgn);
+}
+
+// get some unsigned bits
+stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg* j, int n) {+ unsigned int k;
+ if (j->code_bits < n)
+ stbi__grow_buffer_unsafe(j);
+ k = stbi_lrot(j->code_buffer, n);
+ j->code_buffer = k & ~stbi__bmask[n];
+ k &= stbi__bmask[n];
+ j->code_bits -= n;
+ return k;
+}
+
+stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg* j) {+ unsigned int k;
+ if (j->code_bits < 1)
+ stbi__grow_buffer_unsafe(j);
+ k = j->code_buffer;
+ j->code_buffer <<= 1;
+ --j->code_bits;
+ return k & 0x80000000;
+}
+
+// given a value that's at position X in the zigzag stream,
+// where does it appear in the 8x8 matrix coded as row-major?
+static const stbi_uc stbi__jpeg_dezigzag[64 + 15] = {0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7,+ 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46,
+ 53, 60, 61, 54, 47, 55, 62, 63,
+ // let corrupt input sample past end
+ 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63};
+
+// decode one 64-entry block--
+static int stbi__jpeg_decode_block(stbi__jpeg* j, short data[64], stbi__huffman* hdc, stbi__huffman* hac, stbi__int16* fac, int b, stbi__uint16* dequant) {+ int diff, dc, k;
+ int t;
+
+ if (j->code_bits < 16)
+ stbi__grow_buffer_unsafe(j);
+ t = stbi__jpeg_huff_decode(j, hdc);
+ if (t < 0)
+ return stbi__err("bad huffman code", "Corrupt JPEG");+
+ // 0 all the ac values now so we can do it 32-bits at a time
+ memset(data, 0, 64 * sizeof(data[0]));
+
+ diff = t ? stbi__extend_receive(j, t) : 0;
+ dc = j->img_comp[b].dc_pred + diff;
+ j->img_comp[b].dc_pred = dc;
+ data[0] = (short)(dc * dequant[0]);
+
+ // decode AC components, see JPEG spec
+ k = 1;
+ do {+ unsigned int zig;
+ int c, r, s;
+ if (j->code_bits < 16)
+ stbi__grow_buffer_unsafe(j);
+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS) - 1);
+ r = fac[c];
+ if (r) { // fast-AC path+ k += (r >> 4) & 15; // run
+ s = r & 15; // combined length
+ j->code_buffer <<= s;
+ j->code_bits -= s;
+ // decode into unzigzag'd location
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short)((r >> 8) * dequant[zig]);
+ } else {+ int rs = stbi__jpeg_huff_decode(j, hac);
+ if (rs < 0)
+ return stbi__err("bad huffman code", "Corrupt JPEG");+ s = rs & 15;
+ r = rs >> 4;
+ if (s == 0) {+ if (rs != 0xf0)
+ break; // end block
+ k += 16;
+ } else {+ k += r;
+ // decode into unzigzag'd location
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short)(stbi__extend_receive(j, s) * dequant[zig]);
+ }
+ }
+ } while (k < 64);
+ return 1;
+}
+
+static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg* j, short data[64], stbi__huffman* hdc, int b) {+ int diff, dc;
+ int t;
+ if (j->spec_end != 0)
+ return stbi__err("can't merge dc and ac", "Corrupt JPEG");+
+ if (j->code_bits < 16)
+ stbi__grow_buffer_unsafe(j);
+
+ if (j->succ_high == 0) {+ // first scan for DC coefficient, must be first
+ memset(data, 0, 64 * sizeof(data[0])); // 0 all the ac values now
+ t = stbi__jpeg_huff_decode(j, hdc);
+ diff = t ? stbi__extend_receive(j, t) : 0;
+
+ dc = j->img_comp[b].dc_pred + diff;
+ j->img_comp[b].dc_pred = dc;
+ data[0] = (short)(dc << j->succ_low);
+ } else {+ // refinement scan for DC coefficient
+ if (stbi__jpeg_get_bit(j))
+ data[0] += (short)(1 << j->succ_low);
+ }
+ return 1;
+}
+
+// @OPTIMIZE: store non-zigzagged during the decode passes,
+// and only de-zigzag when dequantizing
+static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg* j, short data[64], stbi__huffman* hac, stbi__int16* fac) {+ int k;
+ if (j->spec_start == 0)
+ return stbi__err("can't merge dc and ac", "Corrupt JPEG");+
+ if (j->succ_high == 0) {+ int shift = j->succ_low;
+
+ if (j->eob_run) {+ --j->eob_run;
+ return 1;
+ }
+
+ k = j->spec_start;
+ do {+ unsigned int zig;
+ int c, r, s;
+ if (j->code_bits < 16)
+ stbi__grow_buffer_unsafe(j);
+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS) - 1);
+ r = fac[c];
+ if (r) { // fast-AC path+ k += (r >> 4) & 15; // run
+ s = r & 15; // combined length
+ j->code_buffer <<= s;
+ j->code_bits -= s;
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short)((r >> 8) << shift);
+ } else {+ int rs = stbi__jpeg_huff_decode(j, hac);
+ if (rs < 0)
+ return stbi__err("bad huffman code", "Corrupt JPEG");+ s = rs & 15;
+ r = rs >> 4;
+ if (s == 0) {+ if (r < 15) {+ j->eob_run = (1 << r);
+ if (r)
+ j->eob_run += stbi__jpeg_get_bits(j, r);
+ --j->eob_run;
+ break;
+ }
+ k += 16;
+ } else {+ k += r;
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short)(stbi__extend_receive(j, s) << shift);
+ }
+ }
+ } while (k <= j->spec_end);
+ } else {+ // refinement scan for these AC coefficients
+
+ short bit = (short)(1 << j->succ_low);
+
+ if (j->eob_run) {+ --j->eob_run;
+ for (k = j->spec_start; k <= j->spec_end; ++k) {+ short* p = &data[stbi__jpeg_dezigzag[k]];
+ if (*p != 0)
+ if (stbi__jpeg_get_bit(j))
+ if ((*p & bit) == 0) {+ if (*p > 0)
+ *p += bit;
+ else
+ *p -= bit;
+ }
+ }
+ } else {+ k = j->spec_start;
+ do {+ int r, s;
+ int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here,
+ // advance-by-r is so slow, eh
+ if (rs < 0)
+ return stbi__err("bad huffman code", "Corrupt JPEG");+ s = rs & 15;
+ r = rs >> 4;
+ if (s == 0) {+ if (r < 15) {+ j->eob_run = (1 << r) - 1;
+ if (r)
+ j->eob_run += stbi__jpeg_get_bits(j, r);
+ r = 64; // force end of block
+ } else {+ // r=15 s=0 should write 16 0s, so we just do
+ // a run of 15 0s and then write s (which is 0),
+ // so we don't have to do anything special here
+ }
+ } else {+ if (s != 1)
+ return stbi__err("bad huffman code", "Corrupt JPEG");+ // sign bit
+ if (stbi__jpeg_get_bit(j))
+ s = bit;
+ else
+ s = -bit;
+ }
+
+ // advance by r
+ while (k <= j->spec_end) {+ short* p = &data[stbi__jpeg_dezigzag[k++]];
+ if (*p != 0) {+ if (stbi__jpeg_get_bit(j))
+ if ((*p & bit) == 0) {+ if (*p > 0)
+ *p += bit;
+ else
+ *p -= bit;
+ }
+ } else {+ if (r == 0) {+ *p = (short)s;
+ break;
+ }
+ --r;
+ }
+ }
+ } while (k <= j->spec_end);
+ }
+ }
+ return 1;
+}
+
+// take a -128..127 value and stbi__clamp it and convert to 0..255
+stbi_inline static stbi_uc stbi__clamp(int x) {+ // trick to use a single test to catch both cases
+ if ((unsigned int)x > 255) {+ if (x < 0)
+ return 0;
+ if (x > 255)
+ return 255;
+ }
+ return (stbi_uc)x;
+}
+
+#define stbi__f2f(x) ((int)(((x)*4096 + 0.5)))
+#define stbi__fsh(x) ((x)*4096)
+
+// derived from jidctint -- DCT_ISLOW
+#define STBI__IDCT_1D(s0, s1, s2, s3, s4, s5, s6, s7) \
+ int t0, t1, t2, t3, p1, p2, p3, p4, p5, x0, x1, x2, x3; \
+ p2 = s2; \
+ p3 = s6; \
+ p1 = (p2 + p3) * stbi__f2f(0.5411961f); \
+ t2 = p1 + p3 * stbi__f2f(-1.847759065f); \
+ t3 = p1 + p2 * stbi__f2f(0.765366865f); \
+ p2 = s0; \
+ p3 = s4; \
+ t0 = stbi__fsh(p2 + p3); \
+ t1 = stbi__fsh(p2 - p3); \
+ x0 = t0 + t3; \
+ x3 = t0 - t3; \
+ x1 = t1 + t2; \
+ x2 = t1 - t2; \
+ t0 = s7; \
+ t1 = s5; \
+ t2 = s3; \
+ t3 = s1; \
+ p3 = t0 + t2; \
+ p4 = t1 + t3; \
+ p1 = t0 + t3; \
+ p2 = t1 + t2; \
+ p5 = (p3 + p4) * stbi__f2f(1.175875602f); \
+ t0 = t0 * stbi__f2f(0.298631336f); \
+ t1 = t1 * stbi__f2f(2.053119869f); \
+ t2 = t2 * stbi__f2f(3.072711026f); \
+ t3 = t3 * stbi__f2f(1.501321110f); \
+ p1 = p5 + p1 * stbi__f2f(-0.899976223f); \
+ p2 = p5 + p2 * stbi__f2f(-2.562915447f); \
+ p3 = p3 * stbi__f2f(-1.961570560f); \
+ p4 = p4 * stbi__f2f(-0.390180644f); \
+ t3 += p1 + p4; \
+ t2 += p2 + p3; \
+ t1 += p2 + p4; \
+ t0 += p1 + p3;
+
+static void stbi__idct_block(stbi_uc* out, int out_stride, short data[64]) {+ int i, val[64], *v = val;
+ stbi_uc* o;
+ short* d = data;
+
+ // columns
+ for (i = 0; i < 8; ++i, ++d, ++v) {+ // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
+ if (d[8] == 0 && d[16] == 0 && d[24] == 0 && d[32] == 0 && d[40] == 0 && d[48] == 0 && d[56] == 0) {+ // no shortcut 0 seconds
+ // (1|2|3|4|5|6|7)==0 0 seconds
+ // all separate -0.047 seconds
+ // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds
+ int dcterm = d[0] * 4;
+ v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
+ } else {+ STBI__IDCT_1D(d[0], d[8], d[16], d[24], d[32], d[40], d[48], d[56])
+ // constants scaled things up by 1<<12; let's bring them back
+ // down, but keep 2 extra bits of precision
+ x0 += 512;
+ x1 += 512;
+ x2 += 512;
+ x3 += 512;
+ v[0] = (x0 + t3) >> 10;
+ v[56] = (x0 - t3) >> 10;
+ v[8] = (x1 + t2) >> 10;
+ v[48] = (x1 - t2) >> 10;
+ v[16] = (x2 + t1) >> 10;
+ v[40] = (x2 - t1) >> 10;
+ v[24] = (x3 + t0) >> 10;
+ v[32] = (x3 - t0) >> 10;
+ }
+ }
+
+ for (i = 0, v = val, o = out; i < 8; ++i, v += 8, o += out_stride) {+ // no fast case since the first 1D IDCT spread components out
+ STBI__IDCT_1D(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7])
+ // constants scaled things up by 1<<12, plus we had 1<<2 from first
+ // loop, plus horizontal and vertical each scale by sqrt(8) so together
+ // we've got an extra 1<<3, so 1<<17 total we need to remove.
+ // so we want to round that, which means adding 0.5 * 1<<17,
+ // aka 65536. Also, we'll end up with -128 to 127 that we want
+ // to encode as 0..255 by adding 128, so we'll add that before the shift
+ x0 += 65536 + (128 << 17);
+ x1 += 65536 + (128 << 17);
+ x2 += 65536 + (128 << 17);
+ x3 += 65536 + (128 << 17);
+ // tried computing the shifts into temps, or'ing the temps to see
+ // if any were out of range, but that was slower
+ o[0] = stbi__clamp((x0 + t3) >> 17);
+ o[7] = stbi__clamp((x0 - t3) >> 17);
+ o[1] = stbi__clamp((x1 + t2) >> 17);
+ o[6] = stbi__clamp((x1 - t2) >> 17);
+ o[2] = stbi__clamp((x2 + t1) >> 17);
+ o[5] = stbi__clamp((x2 - t1) >> 17);
+ o[3] = stbi__clamp((x3 + t0) >> 17);
+ o[4] = stbi__clamp((x3 - t0) >> 17);
+ }
+}
+
+#ifdef STBI_SSE2
+// sse2 integer IDCT. not the fastest possible implementation but it
+// produces bit-identical results to the generic C version so it's
+// fully "transparent".
+static void stbi__idct_simd(stbi_uc* out, int out_stride, short data[64]) {+ // This is constructed to match our regular (generic) integer IDCT exactly.
+ __m128i row0, row1, row2, row3, row4, row5, row6, row7;
+ __m128i tmp;
+
+// dot product constant: even elems=x, odd elems=y
+#define dct_const(x, y) _mm_setr_epi16((x), (y), (x), (y), (x), (y), (x), (y))
+
+// out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit)
+// out(1) = c1[even]*x + c1[odd]*y
+#define dct_rot(out0, out1, x, y, c0, c1) \
+ __m128i c0##lo = _mm_unpacklo_epi16((x), (y)); \
+ __m128i c0##hi = _mm_unpackhi_epi16((x), (y)); \
+ __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \
+ __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \
+ __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \
+ __m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
+
+// out = in << 12 (in 16-bit, out 32-bit)
+#define dct_widen(out, in) \
+ __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \
+ __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
+
+// wide add
+#define dct_wadd(out, a, b) \
+ __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \
+ __m128i out##_h = _mm_add_epi32(a##_h, b##_h)
+
+// wide sub
+#define dct_wsub(out, a, b) \
+ __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \
+ __m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
+
+// butterfly a/b, add bias, then shift by "s" and pack
+#define dct_bfly32o(out0, out1, a, b, bias, s) \
+ { \+ __m128i abiased_l = _mm_add_epi32(a##_l, bias); \
+ __m128i abiased_h = _mm_add_epi32(a##_h, bias); \
+ dct_wadd(sum, abiased, b); \
+ dct_wsub(dif, abiased, b); \
+ out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \
+ out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \
+ }
+
+// 8-bit interleave step (for transposes)
+#define dct_interleave8(a, b) \
+ tmp = a; \
+ a = _mm_unpacklo_epi8(a, b); \
+ b = _mm_unpackhi_epi8(tmp, b)
+
+// 16-bit interleave step (for transposes)
+#define dct_interleave16(a, b) \
+ tmp = a; \
+ a = _mm_unpacklo_epi16(a, b); \
+ b = _mm_unpackhi_epi16(tmp, b)
+
+#define dct_pass(bias, shift) \
+ { \+ /* even part */ \
+ dct_rot(t2e, t3e, row2, row6, rot0_0, rot0_1); \
+ __m128i sum04 = _mm_add_epi16(row0, row4); \
+ __m128i dif04 = _mm_sub_epi16(row0, row4); \
+ dct_widen(t0e, sum04); \
+ dct_widen(t1e, dif04); \
+ dct_wadd(x0, t0e, t3e); \
+ dct_wsub(x3, t0e, t3e); \
+ dct_wadd(x1, t1e, t2e); \
+ dct_wsub(x2, t1e, t2e); \
+ /* odd part */ \
+ dct_rot(y0o, y2o, row7, row3, rot2_0, rot2_1); \
+ dct_rot(y1o, y3o, row5, row1, rot3_0, rot3_1); \
+ __m128i sum17 = _mm_add_epi16(row1, row7); \
+ __m128i sum35 = _mm_add_epi16(row3, row5); \
+ dct_rot(y4o, y5o, sum17, sum35, rot1_0, rot1_1); \
+ dct_wadd(x4, y0o, y4o); \
+ dct_wadd(x5, y1o, y5o); \
+ dct_wadd(x6, y2o, y5o); \
+ dct_wadd(x7, y3o, y4o); \
+ dct_bfly32o(row0, row7, x0, x7, bias, shift); \
+ dct_bfly32o(row1, row6, x1, x6, bias, shift); \
+ dct_bfly32o(row2, row5, x2, x5, bias, shift); \
+ dct_bfly32o(row3, row4, x3, x4, bias, shift); \
+ }
+
+ __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
+ __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f(0.765366865f), stbi__f2f(0.5411961f));
+ __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f));
+ __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
+ __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f(0.298631336f), stbi__f2f(-1.961570560f));
+ __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f(3.072711026f));
+ __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f(2.053119869f), stbi__f2f(-0.390180644f));
+ __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f(1.501321110f));
+
+ // rounding biases in column/row passes, see stbi__idct_block for
+ // explanation.
+ __m128i bias_0 = _mm_set1_epi32(512);
+ __m128i bias_1 = _mm_set1_epi32(65536 + (128 << 17));
+
+ // load
+ row0 = _mm_load_si128((const __m128i*)(data + 0 * 8));
+ row1 = _mm_load_si128((const __m128i*)(data + 1 * 8));
+ row2 = _mm_load_si128((const __m128i*)(data + 2 * 8));
+ row3 = _mm_load_si128((const __m128i*)(data + 3 * 8));
+ row4 = _mm_load_si128((const __m128i*)(data + 4 * 8));
+ row5 = _mm_load_si128((const __m128i*)(data + 5 * 8));
+ row6 = _mm_load_si128((const __m128i*)(data + 6 * 8));
+ row7 = _mm_load_si128((const __m128i*)(data + 7 * 8));
+
+ // column pass
+ dct_pass(bias_0, 10);
+
+ {+ // 16bit 8x8 transpose pass 1
+ dct_interleave16(row0, row4);
+ dct_interleave16(row1, row5);
+ dct_interleave16(row2, row6);
+ dct_interleave16(row3, row7);
+
+ // transpose pass 2
+ dct_interleave16(row0, row2);
+ dct_interleave16(row1, row3);
+ dct_interleave16(row4, row6);
+ dct_interleave16(row5, row7);
+
+ // transpose pass 3
+ dct_interleave16(row0, row1);
+ dct_interleave16(row2, row3);
+ dct_interleave16(row4, row5);
+ dct_interleave16(row6, row7);
+ }
+
+ // row pass
+ dct_pass(bias_1, 17);
+
+ {+ // pack
+ __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
+ __m128i p1 = _mm_packus_epi16(row2, row3);
+ __m128i p2 = _mm_packus_epi16(row4, row5);
+ __m128i p3 = _mm_packus_epi16(row6, row7);
+
+ // 8bit 8x8 transpose pass 1
+ dct_interleave8(p0, p2); // a0e0a1e1...
+ dct_interleave8(p1, p3); // c0g0c1g1...
+
+ // transpose pass 2
+ dct_interleave8(p0, p1); // a0c0e0g0...
+ dct_interleave8(p2, p3); // b0d0f0h0...
+
+ // transpose pass 3
+ dct_interleave8(p0, p2); // a0b0c0d0...
+ dct_interleave8(p1, p3); // a4b4c4d4...
+
+ // store
+ _mm_storel_epi64((__m128i*)out, p0);
+ out += out_stride;
+ _mm_storel_epi64((__m128i*)out, _mm_shuffle_epi32(p0, 0x4e));
+ out += out_stride;
+ _mm_storel_epi64((__m128i*)out, p2);
+ out += out_stride;
+ _mm_storel_epi64((__m128i*)out, _mm_shuffle_epi32(p2, 0x4e));
+ out += out_stride;
+ _mm_storel_epi64((__m128i*)out, p1);
+ out += out_stride;
+ _mm_storel_epi64((__m128i*)out, _mm_shuffle_epi32(p1, 0x4e));
+ out += out_stride;
+ _mm_storel_epi64((__m128i*)out, p3);
+ out += out_stride;
+ _mm_storel_epi64((__m128i*)out, _mm_shuffle_epi32(p3, 0x4e));
+ }
+
+#undef dct_const
+#undef dct_rot
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_interleave8
+#undef dct_interleave16
+#undef dct_pass
+}
+
+#endif // STBI_SSE2
+
+#ifdef STBI_NEON
+
+// NEON integer IDCT. should produce bit-identical
+// results to the generic C version.
+static void stbi__idct_simd(stbi_uc* out, int out_stride, short data[64]) {+ int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
+
+ int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
+ int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
+ int16x4_t rot0_2 = vdup_n_s16(stbi__f2f(0.765366865f));
+ int16x4_t rot1_0 = vdup_n_s16(stbi__f2f(1.175875602f));
+ int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
+ int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
+ int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
+ int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
+ int16x4_t rot3_0 = vdup_n_s16(stbi__f2f(0.298631336f));
+ int16x4_t rot3_1 = vdup_n_s16(stbi__f2f(2.053119869f));
+ int16x4_t rot3_2 = vdup_n_s16(stbi__f2f(3.072711026f));
+ int16x4_t rot3_3 = vdup_n_s16(stbi__f2f(1.501321110f));
+
+#define dct_long_mul(out, inq, coeff) \
+ int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \
+ int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
+
+#define dct_long_mac(out, acc, inq, coeff) \
+ int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \
+ int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
+
+#define dct_widen(out, inq) \
+ int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \
+ int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
+
+// wide add
+#define dct_wadd(out, a, b) \
+ int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \
+ int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
+
+// wide sub
+#define dct_wsub(out, a, b) \
+ int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \
+ int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
+
+// butterfly a/b, then shift using "shiftop" by "s" and pack
+#define dct_bfly32o(out0, out1, a, b, shiftop, s) \
+ { \+ dct_wadd(sum, a, b); \
+ dct_wsub(dif, a, b); \
+ out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \
+ out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \
+ }
+
+#define dct_pass(shiftop, shift) \
+ { \+ /* even part */ \
+ int16x8_t sum26 = vaddq_s16(row2, row6); \
+ dct_long_mul(p1e, sum26, rot0_0); \
+ dct_long_mac(t2e, p1e, row6, rot0_1); \
+ dct_long_mac(t3e, p1e, row2, rot0_2); \
+ int16x8_t sum04 = vaddq_s16(row0, row4); \
+ int16x8_t dif04 = vsubq_s16(row0, row4); \
+ dct_widen(t0e, sum04); \
+ dct_widen(t1e, dif04); \
+ dct_wadd(x0, t0e, t3e); \
+ dct_wsub(x3, t0e, t3e); \
+ dct_wadd(x1, t1e, t2e); \
+ dct_wsub(x2, t1e, t2e); \
+ /* odd part */ \
+ int16x8_t sum15 = vaddq_s16(row1, row5); \
+ int16x8_t sum17 = vaddq_s16(row1, row7); \
+ int16x8_t sum35 = vaddq_s16(row3, row5); \
+ int16x8_t sum37 = vaddq_s16(row3, row7); \
+ int16x8_t sumodd = vaddq_s16(sum17, sum35); \
+ dct_long_mul(p5o, sumodd, rot1_0); \
+ dct_long_mac(p1o, p5o, sum17, rot1_1); \
+ dct_long_mac(p2o, p5o, sum35, rot1_2); \
+ dct_long_mul(p3o, sum37, rot2_0); \
+ dct_long_mul(p4o, sum15, rot2_1); \
+ dct_wadd(sump13o, p1o, p3o); \
+ dct_wadd(sump24o, p2o, p4o); \
+ dct_wadd(sump23o, p2o, p3o); \
+ dct_wadd(sump14o, p1o, p4o); \
+ dct_long_mac(x4, sump13o, row7, rot3_0); \
+ dct_long_mac(x5, sump24o, row5, rot3_1); \
+ dct_long_mac(x6, sump23o, row3, rot3_2); \
+ dct_long_mac(x7, sump14o, row1, rot3_3); \
+ dct_bfly32o(row0, row7, x0, x7, shiftop, shift); \
+ dct_bfly32o(row1, row6, x1, x6, shiftop, shift); \
+ dct_bfly32o(row2, row5, x2, x5, shiftop, shift); \
+ dct_bfly32o(row3, row4, x3, x4, shiftop, shift); \
+ }
+
+ // load
+ row0 = vld1q_s16(data + 0 * 8);
+ row1 = vld1q_s16(data + 1 * 8);
+ row2 = vld1q_s16(data + 2 * 8);
+ row3 = vld1q_s16(data + 3 * 8);
+ row4 = vld1q_s16(data + 4 * 8);
+ row5 = vld1q_s16(data + 5 * 8);
+ row6 = vld1q_s16(data + 6 * 8);
+ row7 = vld1q_s16(data + 7 * 8);
+
+ // add DC bias
+ row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
+
+ // column pass
+ dct_pass(vrshrn_n_s32, 10);
+
+ // 16bit 8x8 transpose
+ {+// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively.
+// whether compilers actually get this is another story, sadly.
+#define dct_trn16(x, y) \
+ { \+ int16x8x2_t t = vtrnq_s16(x, y); \
+ x = t.val[0]; \
+ y = t.val[1]; \
+ }
+#define dct_trn32(x, y) \
+ { \+ int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); \
+ x = vreinterpretq_s16_s32(t.val[0]); \
+ y = vreinterpretq_s16_s32(t.val[1]); \
+ }
+#define dct_trn64(x, y) \
+ { \+ int16x8_t x0 = x; \
+ int16x8_t y0 = y; \
+ x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); \
+ y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); \
+ }
+
+ // pass 1
+ dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
+ dct_trn16(row2, row3);
+ dct_trn16(row4, row5);
+ dct_trn16(row6, row7);
+
+ // pass 2
+ dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
+ dct_trn32(row1, row3);
+ dct_trn32(row4, row6);
+ dct_trn32(row5, row7);
+
+ // pass 3
+ dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
+ dct_trn64(row1, row5);
+ dct_trn64(row2, row6);
+ dct_trn64(row3, row7);
+
+#undef dct_trn16
+#undef dct_trn32
+#undef dct_trn64
+ }
+
+ // row pass
+ // vrshrn_n_s32 only supports shifts up to 16, we need
+ // 17. so do a non-rounding shift of 16 first then follow
+ // up with a rounding shift by 1.
+ dct_pass(vshrn_n_s32, 16);
+
+ {+ // pack and round
+ uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
+ uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
+ uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
+ uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
+ uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
+ uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
+ uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
+ uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
+
+ // again, these can translate into one instruction, but often don't.
+#define dct_trn8_8(x, y) \
+ { \+ uint8x8x2_t t = vtrn_u8(x, y); \
+ x = t.val[0]; \
+ y = t.val[1]; \
+ }
+#define dct_trn8_16(x, y) \
+ { \+ uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); \
+ x = vreinterpret_u8_u16(t.val[0]); \
+ y = vreinterpret_u8_u16(t.val[1]); \
+ }
+#define dct_trn8_32(x, y) \
+ { \+ uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); \
+ x = vreinterpret_u8_u32(t.val[0]); \
+ y = vreinterpret_u8_u32(t.val[1]); \
+ }
+
+ // sadly can't use interleaved stores here since we only write
+ // 8 bytes to each scan line!
+
+ // 8x8 8-bit transpose pass 1
+ dct_trn8_8(p0, p1);
+ dct_trn8_8(p2, p3);
+ dct_trn8_8(p4, p5);
+ dct_trn8_8(p6, p7);
+
+ // pass 2
+ dct_trn8_16(p0, p2);
+ dct_trn8_16(p1, p3);
+ dct_trn8_16(p4, p6);
+ dct_trn8_16(p5, p7);
+
+ // pass 3
+ dct_trn8_32(p0, p4);
+ dct_trn8_32(p1, p5);
+ dct_trn8_32(p2, p6);
+ dct_trn8_32(p3, p7);
+
+ // store
+ vst1_u8(out, p0);
+ out += out_stride;
+ vst1_u8(out, p1);
+ out += out_stride;
+ vst1_u8(out, p2);
+ out += out_stride;
+ vst1_u8(out, p3);
+ out += out_stride;
+ vst1_u8(out, p4);
+ out += out_stride;
+ vst1_u8(out, p5);
+ out += out_stride;
+ vst1_u8(out, p6);
+ out += out_stride;
+ vst1_u8(out, p7);
+
+#undef dct_trn8_8
+#undef dct_trn8_16
+#undef dct_trn8_32
+ }
+
+#undef dct_long_mul
+#undef dct_long_mac
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_pass
+}
+
+#endif // STBI_NEON
+
+#define STBI__MARKER_none 0xff
+// if there's a pending marker from the entropy stream, return that
+// otherwise, fetch from the stream and get a marker. if there's no
+// marker, return 0xff, which is never a valid marker value
+static stbi_uc stbi__get_marker(stbi__jpeg* j) {+ stbi_uc x;
+ if (j->marker != STBI__MARKER_none) {+ x = j->marker;
+ j->marker = STBI__MARKER_none;
+ return x;
+ }
+ x = stbi__get8(j->s);
+ if (x != 0xff)
+ return STBI__MARKER_none;
+ while (x == 0xff)
+ x = stbi__get8(j->s); // consume repeated 0xff fill bytes
+ return x;
+}
+
+// in each scan, we'll have scan_n components, and the order
+// of the components is specified by order[]
+#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7)
+
+// after a restart interval, stbi__jpeg_reset the entropy decoder and
+// the dc prediction
+static void stbi__jpeg_reset(stbi__jpeg* j) {+ j->code_bits = 0;
+ j->code_buffer = 0;
+ j->nomore = 0;
+ j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0;
+ j->marker = STBI__MARKER_none;
+ j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
+ j->eob_run = 0;
+ // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
+ // since we don't even allow 1<<30 pixels
+}
+
+static int stbi__parse_entropy_coded_data(stbi__jpeg* z) {+ stbi__jpeg_reset(z);
+ if (!z->progressive) {+ if (z->scan_n == 1) {+ int i, j;
+ STBI_SIMD_ALIGN(short, data[64]);
+ int n = z->order[0];
+ // non-interleaved data, we just need to process one block at a
+ // time, in trivial scanline order number of blocks to do just
+ // depends on how many actual "pixels" this component has,
+ // independent of interleaved MCU blocking and such
+ int w = (z->img_comp[n].x + 7) >> 3;
+ int h = (z->img_comp[n].y + 7) >> 3;
+ for (j = 0; j < h; ++j) {+ for (i = 0; i < w; ++i) {+ int ha = z->img_comp[n].ha;
+ if (!stbi__jpeg_decode_block(z, data, z->huff_dc + z->img_comp[n].hd, z->huff_ac + ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq]))
+ return 0;
+ z->idct_block_kernel(z->img_comp[n].data + z->img_comp[n].w2 * j * 8 + i * 8, z->img_comp[n].w2, data);
+ // every data block is an MCU, so countdown the restart
+ // interval
+ if (--z->todo <= 0) {+ if (z->code_bits < 24)
+ stbi__grow_buffer_unsafe(z);
+ // if it's NOT a restart, then just bail, so we get
+ // corrupt data rather than no data
+ if (!STBI__RESTART(z->marker))
+ return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
+ }
+ return 1;
+ } else { // interleaved+ int i, j, k, x, y;
+ STBI_SIMD_ALIGN(short, data[64]);
+ for (j = 0; j < z->img_mcu_y; ++j) {+ for (i = 0; i < z->img_mcu_x; ++i) {+ // scan an interleaved mcu... process scan_n components in
+ // order
+ for (k = 0; k < z->scan_n; ++k) {+ int n = z->order[k];
+ // scan out an mcu's worth of this component; that's
+ // just determined by the basic H and V specified for
+ // the component
+ for (y = 0; y < z->img_comp[n].v; ++y) {+ for (x = 0; x < z->img_comp[n].h; ++x) {+ int x2 = (i * z->img_comp[n].h + x) * 8;
+ int y2 = (j * z->img_comp[n].v + y) * 8;
+ int ha = z->img_comp[n].ha;
+ if (!stbi__jpeg_decode_block(z, data, z->huff_dc + z->img_comp[n].hd, z->huff_ac + ha, z->fast_ac[ha], n,
+ z->dequant[z->img_comp[n].tq]))
+ return 0;
+ z->idct_block_kernel(z->img_comp[n].data + z->img_comp[n].w2 * y2 + x2, z->img_comp[n].w2, data);
+ }
+ }
+ }
+ // after all interleaved components, that's an interleaved
+ // MCU, so now count down the restart interval
+ if (--z->todo <= 0) {+ if (z->code_bits < 24)
+ stbi__grow_buffer_unsafe(z);
+ if (!STBI__RESTART(z->marker))
+ return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
+ }
+ return 1;
+ }
+ } else {+ if (z->scan_n == 1) {+ int i, j;
+ int n = z->order[0];
+ // non-interleaved data, we just need to process one block at a
+ // time, in trivial scanline order number of blocks to do just
+ // depends on how many actual "pixels" this component has,
+ // independent of interleaved MCU blocking and such
+ int w = (z->img_comp[n].x + 7) >> 3;
+ int h = (z->img_comp[n].y + 7) >> 3;
+ for (j = 0; j < h; ++j) {+ for (i = 0; i < w; ++i) {+ short* data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+ if (z->spec_start == 0) {+ if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+ return 0;
+ } else {+ int ha = z->img_comp[n].ha;
+ if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha]))
+ return 0;
+ }
+ // every data block is an MCU, so countdown the restart
+ // interval
+ if (--z->todo <= 0) {+ if (z->code_bits < 24)
+ stbi__grow_buffer_unsafe(z);
+ if (!STBI__RESTART(z->marker))
+ return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
+ }
+ return 1;
+ } else { // interleaved+ int i, j, k, x, y;
+ for (j = 0; j < z->img_mcu_y; ++j) {+ for (i = 0; i < z->img_mcu_x; ++i) {+ // scan an interleaved mcu... process scan_n components in
+ // order
+ for (k = 0; k < z->scan_n; ++k) {+ int n = z->order[k];
+ // scan out an mcu's worth of this component; that's
+ // just determined by the basic H and V specified for
+ // the component
+ for (y = 0; y < z->img_comp[n].v; ++y) {+ for (x = 0; x < z->img_comp[n].h; ++x) {+ int x2 = (i * z->img_comp[n].h + x);
+ int y2 = (j * z->img_comp[n].v + y);
+ short* data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w);
+ if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+ return 0;
+ }
+ }
+ }
+ // after all interleaved components, that's an interleaved
+ // MCU, so now count down the restart interval
+ if (--z->todo <= 0) {+ if (z->code_bits < 24)
+ stbi__grow_buffer_unsafe(z);
+ if (!STBI__RESTART(z->marker))
+ return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
+ }
+ return 1;
+ }
+ }
+}
+
+static void stbi__jpeg_dequantize(short* data, stbi__uint16* dequant) {+ int i;
+ for (i = 0; i < 64; ++i)
+ data[i] *= dequant[i];
+}
+
+static void stbi__jpeg_finish(stbi__jpeg* z) {+ if (z->progressive) {+ // dequantize and idct the data
+ int i, j, n;
+ for (n = 0; n < z->s->img_n; ++n) {+ int w = (z->img_comp[n].x + 7) >> 3;
+ int h = (z->img_comp[n].y + 7) >> 3;
+ for (j = 0; j < h; ++j) {+ for (i = 0; i < w; ++i) {+ short* data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+ stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
+ z->idct_block_kernel(z->img_comp[n].data + z->img_comp[n].w2 * j * 8 + i * 8, z->img_comp[n].w2, data);
+ }
+ }
+ }
+ }
+}
+
+static int stbi__process_marker(stbi__jpeg* z, int m) {+ int L;
+ switch (m) {+ case STBI__MARKER_none: // no marker found
+ return stbi__err("expected marker", "Corrupt JPEG");+
+ case 0xDD: // DRI - specify restart interval
+ if (stbi__get16be(z->s) != 4)
+ return stbi__err("bad DRI len", "Corrupt JPEG");+ z->restart_interval = stbi__get16be(z->s);
+ return 1;
+
+ case 0xDB: // DQT - define quantization table
+ L = stbi__get16be(z->s) - 2;
+ while (L > 0) {+ int q = stbi__get8(z->s);
+ int p = q >> 4, sixteen = (p != 0);
+ int t = q & 15, i;
+ if (p != 0 && p != 1)
+ return stbi__err("bad DQT type", "Corrupt JPEG");+ if (t > 3)
+ return stbi__err("bad DQT table", "Corrupt JPEG");+
+ for (i = 0; i < 64; ++i)
+ z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)(sixteen ? stbi__get16be(z->s) : stbi__get8(z->s));
+ L -= (sixteen ? 129 : 65);
+ }
+ return L == 0;
+
+ case 0xC4: // DHT - define huffman table
+ L = stbi__get16be(z->s) - 2;
+ while (L > 0) {+ stbi_uc* v;
+ int sizes[16], i, n = 0;
+ int q = stbi__get8(z->s);
+ int tc = q >> 4;
+ int th = q & 15;
+ if (tc > 1 || th > 3)
+ return stbi__err("bad DHT header", "Corrupt JPEG");+ for (i = 0; i < 16; ++i) {+ sizes[i] = stbi__get8(z->s);
+ n += sizes[i];
+ }
+ L -= 17;
+ if (tc == 0) {+ if (!stbi__build_huffman(z->huff_dc + th, sizes))
+ return 0;
+ v = z->huff_dc[th].values;
+ } else {+ if (!stbi__build_huffman(z->huff_ac + th, sizes))
+ return 0;
+ v = z->huff_ac[th].values;
+ }
+ for (i = 0; i < n; ++i)
+ v[i] = stbi__get8(z->s);
+ if (tc != 0)
+ stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
+ L -= n;
+ }
+ return L == 0;
+ }
+
+ // check for comment block or APP blocks
+ if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {+ L = stbi__get16be(z->s);
+ if (L < 2) {+ if (m == 0xFE)
+ return stbi__err("bad COM len", "Corrupt JPEG");+ else
+ return stbi__err("bad APP len", "Corrupt JPEG");+ }
+ L -= 2;
+
+ if (m == 0xE0 && L >= 5) { // JFIF APP0 segment+ static const unsigned char tag[5] = {'J', 'F', 'I', 'F', '\0'};+ int ok = 1;
+ int i;
+ for (i = 0; i < 5; ++i)
+ if (stbi__get8(z->s) != tag[i])
+ ok = 0;
+ L -= 5;
+ if (ok)
+ z->jfif = 1;
+ } else if (m == 0xEE && L >= 12) { // Adobe APP14 segment+ static const unsigned char tag[6] = {'A', 'd', 'o', 'b', 'e', '\0'};+ int ok = 1;
+ int i;
+ for (i = 0; i < 6; ++i)
+ if (stbi__get8(z->s) != tag[i])
+ ok = 0;
+ L -= 6;
+ if (ok) {+ stbi__get8(z->s); // version
+ stbi__get16be(z->s); // flags0
+ stbi__get16be(z->s); // flags1
+ z->app14_color_transform = stbi__get8(z->s); // color transform
+ L -= 6;
+ }
+ }
+
+ stbi__skip(z->s, L);
+ return 1;
+ }
+
+ return stbi__err("unknown marker", "Corrupt JPEG");+}
+
+// after we see SOS
+static int stbi__process_scan_header(stbi__jpeg* z) {+ int i;
+ int Ls = stbi__get16be(z->s);
+ z->scan_n = stbi__get8(z->s);
+ if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int)z->s->img_n)
+ return stbi__err("bad SOS component count", "Corrupt JPEG");+ if (Ls != 6 + 2 * z->scan_n)
+ return stbi__err("bad SOS len", "Corrupt JPEG");+ for (i = 0; i < z->scan_n; ++i) {+ int id = stbi__get8(z->s), which;
+ int q = stbi__get8(z->s);
+ for (which = 0; which < z->s->img_n; ++which)
+ if (z->img_comp[which].id == id)
+ break;
+ if (which == z->s->img_n)
+ return 0; // no match
+ z->img_comp[which].hd = q >> 4;
+ if (z->img_comp[which].hd > 3)
+ return stbi__err("bad DC huff", "Corrupt JPEG");+ z->img_comp[which].ha = q & 15;
+ if (z->img_comp[which].ha > 3)
+ return stbi__err("bad AC huff", "Corrupt JPEG");+ z->order[i] = which;
+ }
+
+ {+ int aa;
+ z->spec_start = stbi__get8(z->s);
+ z->spec_end = stbi__get8(z->s); // should be 63, but might be 0
+ aa = stbi__get8(z->s);
+ z->succ_high = (aa >> 4);
+ z->succ_low = (aa & 15);
+ if (z->progressive) {+ if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13)
+ return stbi__err("bad SOS", "Corrupt JPEG");+ } else {+ if (z->spec_start != 0)
+ return stbi__err("bad SOS", "Corrupt JPEG");+ if (z->succ_high != 0 || z->succ_low != 0)
+ return stbi__err("bad SOS", "Corrupt JPEG");+ z->spec_end = 63;
+ }
+ }
+
+ return 1;
+}
+
+static int stbi__free_jpeg_components(stbi__jpeg* z, int ncomp, int why) {+ int i;
+ for (i = 0; i < ncomp; ++i) {+ if (z->img_comp[i].raw_data) {+ STBI_FREE(z->img_comp[i].raw_data);
+ z->img_comp[i].raw_data = NULL;
+ z->img_comp[i].data = NULL;
+ }
+ if (z->img_comp[i].raw_coeff) {+ STBI_FREE(z->img_comp[i].raw_coeff);
+ z->img_comp[i].raw_coeff = 0;
+ z->img_comp[i].coeff = 0;
+ }
+ if (z->img_comp[i].linebuf) {+ STBI_FREE(z->img_comp[i].linebuf);
+ z->img_comp[i].linebuf = NULL;
+ }
+ }
+ return why;
+}
+
+static int stbi__process_frame_header(stbi__jpeg* z, int scan) {+ stbi__context* s = z->s;
+ int Lf, p, i, q, h_max = 1, v_max = 1, c;
+ Lf = stbi__get16be(s);
+ if (Lf < 11)
+ return stbi__err("bad SOF len", "Corrupt JPEG"); // JPEG+ p = stbi__get8(s);
+ if (p != 8)
+ return stbi__err("only 8-bit",+ "JPEG format not supported: 8-bit only"); // JPEG baseline
+ s->img_y = stbi__get16be(s);
+ if (s->img_y == 0)
+ return stbi__err("no header height",+ "JPEG format not supported: delayed height"); // Legal, but we don't
+ // handle it--but
+ // neither does IJG
+ s->img_x = stbi__get16be(s);
+ if (s->img_x == 0)
+ return stbi__err("0 width", "Corrupt JPEG"); // JPEG requires+ c = stbi__get8(s);
+ if (c != 3 && c != 1 && c != 4)
+ return stbi__err("bad component count", "Corrupt JPEG");+ s->img_n = c;
+ for (i = 0; i < c; ++i) {+ z->img_comp[i].data = NULL;
+ z->img_comp[i].linebuf = NULL;
+ }
+
+ if (Lf != 8 + 3 * s->img_n)
+ return stbi__err("bad SOF len", "Corrupt JPEG");+
+ z->rgb = 0;
+ for (i = 0; i < s->img_n; ++i) {+ static const unsigned char rgb[3] = {'R', 'G', 'B'};+ z->img_comp[i].id = stbi__get8(s);
+ if (s->img_n == 3 && z->img_comp[i].id == rgb[i])
+ ++z->rgb;
+ q = stbi__get8(s);
+ z->img_comp[i].h = (q >> 4);
+ if (!z->img_comp[i].h || z->img_comp[i].h > 4)
+ return stbi__err("bad H", "Corrupt JPEG");+ z->img_comp[i].v = q & 15;
+ if (!z->img_comp[i].v || z->img_comp[i].v > 4)
+ return stbi__err("bad V", "Corrupt JPEG");+ z->img_comp[i].tq = stbi__get8(s);
+ if (z->img_comp[i].tq > 3)
+ return stbi__err("bad TQ", "Corrupt JPEG");+ }
+
+ if (scan != STBI__SCAN_load)
+ return 1;
+
+ if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0))
+ return stbi__err("too large", "Image too large to decode");+
+ for (i = 0; i < s->img_n; ++i) {+ if (z->img_comp[i].h > h_max)
+ h_max = z->img_comp[i].h;
+ if (z->img_comp[i].v > v_max)
+ v_max = z->img_comp[i].v;
+ }
+
+ // compute interleaved mcu info
+ z->img_h_max = h_max;
+ z->img_v_max = v_max;
+ z->img_mcu_w = h_max * 8;
+ z->img_mcu_h = v_max * 8;
+ // these sizes can't be more than 17 bits
+ z->img_mcu_x = (s->img_x + z->img_mcu_w - 1) / z->img_mcu_w;
+ z->img_mcu_y = (s->img_y + z->img_mcu_h - 1) / z->img_mcu_h;
+
+ for (i = 0; i < s->img_n; ++i) {+ // number of effective pixels (e.g. for non-interleaved MCU)
+ z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max - 1) / h_max;
+ z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max - 1) / v_max;
+ // to simplify generation, we'll allocate enough memory to decode
+ // the bogus oversized data from using interleaved MCUs and their
+ // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
+ // discard the extra data until colorspace conversion
+ //
+ // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked
+ // earlier) so these muls can't overflow with 32-bit ints (which we
+ // require)
+ z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
+ z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
+ z->img_comp[i].coeff = 0;
+ z->img_comp[i].raw_coeff = 0;
+ z->img_comp[i].linebuf = NULL;
+ z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15);
+ if (z->img_comp[i].raw_data == NULL)
+ return stbi__free_jpeg_components(z, i + 1, stbi__err("outofmem", "Out of memory"));+ // align blocks for idct using mmx/sse
+ z->img_comp[i].data = (stbi_uc*)(((size_t)z->img_comp[i].raw_data + 15) & ~15);
+ if (z->progressive) {+ // w2, h2 are multiples of 8 (see above)
+ z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8;
+ z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8;
+ z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15);
+ if (z->img_comp[i].raw_coeff == NULL)
+ return stbi__free_jpeg_components(z, i + 1, stbi__err("outofmem", "Out of memory"));+ z->img_comp[i].coeff = (short*)(((size_t)z->img_comp[i].raw_coeff + 15) & ~15);
+ }
+ }
+
+ return 1;
+}
+
+// use comparisons since in some cases we handle more than one case (e.g. SOF)
+#define stbi__DNL(x) ((x) == 0xdc)
+#define stbi__SOI(x) ((x) == 0xd8)
+#define stbi__EOI(x) ((x) == 0xd9)
+#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
+#define stbi__SOS(x) ((x) == 0xda)
+
+#define stbi__SOF_progressive(x) ((x) == 0xc2)
+
+static int stbi__decode_jpeg_header(stbi__jpeg* z, int scan) {+ int m;
+ z->jfif = 0;
+ z->app14_color_transform = -1; // valid values are 0,1,2
+ z->marker = STBI__MARKER_none; // initialize cached marker to empty
+ m = stbi__get_marker(z);
+ if (!stbi__SOI(m))
+ return stbi__err("no SOI", "Corrupt JPEG");+ if (scan == STBI__SCAN_type)
+ return 1;
+ m = stbi__get_marker(z);
+ while (!stbi__SOF(m)) {+ if (!stbi__process_marker(z, m))
+ return 0;
+ m = stbi__get_marker(z);
+ while (m == STBI__MARKER_none) {+ // some files have extra padding after their blocks, so ok, we'll
+ // scan
+ if (stbi__at_eof(z->s))
+ return stbi__err("no SOF", "Corrupt JPEG");+ m = stbi__get_marker(z);
+ }
+ }
+ z->progressive = stbi__SOF_progressive(m);
+ if (!stbi__process_frame_header(z, scan))
+ return 0;
+ return 1;
+}
+
+// decode image to YCbCr format
+static int stbi__decode_jpeg_image(stbi__jpeg* j) {+ int m;
+ for (m = 0; m < 4; m++) {+ j->img_comp[m].raw_data = NULL;
+ j->img_comp[m].raw_coeff = NULL;
+ }
+ j->restart_interval = 0;
+ if (!stbi__decode_jpeg_header(j, STBI__SCAN_load))
+ return 0;
+ m = stbi__get_marker(j);
+ while (!stbi__EOI(m)) {+ if (stbi__SOS(m)) {+ if (!stbi__process_scan_header(j))
+ return 0;
+ if (!stbi__parse_entropy_coded_data(j))
+ return 0;
+ if (j->marker == STBI__MARKER_none) {+ // handle 0s at the end of image data from IP Kamera 9060
+ while (!stbi__at_eof(j->s)) {+ int x = stbi__get8(j->s);
+ if (x == 255) {+ j->marker = stbi__get8(j->s);
+ break;
+ }
+ }
+ // if we reach eof without hitting a marker, stbi__get_marker()
+ // below will fail and we'll eventually return 0
+ }
+ } else if (stbi__DNL(m)) {+ int Ld = stbi__get16be(j->s);
+ stbi__uint32 NL = stbi__get16be(j->s);
+ if (Ld != 4)
+ return stbi__err("bad DNL len", "Corrupt JPEG");+ if (NL != j->s->img_y)
+ return stbi__err("bad DNL height", "Corrupt JPEG");+ } else {+ if (!stbi__process_marker(j, m))
+ return 0;
+ }
+ m = stbi__get_marker(j);
+ }
+ if (j->progressive)
+ stbi__jpeg_finish(j);
+ return 1;
+}
+
+// static jfif-centered resampling (across block boundaries)
+
+typedef stbi_uc* (*resample_row_func)(stbi_uc* out, stbi_uc* in0, stbi_uc* in1, int w, int hs);
+
+#define stbi__div4(x) ((stbi_uc)((x) >> 2))
+
+static stbi_uc* resample_row_1(stbi_uc* out, stbi_uc* in_near, stbi_uc* in_far, int w, int hs) {+ STBI_NOTUSED(out);
+ STBI_NOTUSED(in_far);
+ STBI_NOTUSED(w);
+ STBI_NOTUSED(hs);
+ return in_near;
+}
+
+static stbi_uc* stbi__resample_row_v_2(stbi_uc* out, stbi_uc* in_near, stbi_uc* in_far, int w, int hs) {+ // need to generate two samples vertically for every one in input
+ int i;
+ STBI_NOTUSED(hs);
+ for (i = 0; i < w; ++i)
+ out[i] = stbi__div4(3 * in_near[i] + in_far[i] + 2);
+ return out;
+}
+
+static stbi_uc* stbi__resample_row_h_2(stbi_uc* out, stbi_uc* in_near, stbi_uc* in_far, int w, int hs) {+ // need to generate two samples horizontally for every one in input
+ int i;
+ stbi_uc* input = in_near;
+
+ if (w == 1) {+ // if only one sample, can't do any interpolation
+ out[0] = out[1] = input[0];
+ return out;
+ }
+
+ out[0] = input[0];
+ out[1] = stbi__div4(input[0] * 3 + input[1] + 2);
+ for (i = 1; i < w - 1; ++i) {+ int n = 3 * input[i] + 2;
+ out[i * 2 + 0] = stbi__div4(n + input[i - 1]);
+ out[i * 2 + 1] = stbi__div4(n + input[i + 1]);
+ }
+ out[i * 2 + 0] = stbi__div4(input[w - 2] * 3 + input[w - 1] + 2);
+ out[i * 2 + 1] = input[w - 1];
+
+ STBI_NOTUSED(in_far);
+ STBI_NOTUSED(hs);
+
+ return out;
+}
+
+#define stbi__div16(x) ((stbi_uc)((x) >> 4))
+
+static stbi_uc* stbi__resample_row_hv_2(stbi_uc* out, stbi_uc* in_near, stbi_uc* in_far, int w, int hs) {+ // need to generate 2x2 samples for every one in input
+ int i, t0, t1;
+ if (w == 1) {+ out[0] = out[1] = stbi__div4(3 * in_near[0] + in_far[0] + 2);
+ return out;
+ }
+
+ t1 = 3 * in_near[0] + in_far[0];
+ out[0] = stbi__div4(t1 + 2);
+ for (i = 1; i < w; ++i) {+ t0 = t1;
+ t1 = 3 * in_near[i] + in_far[i];
+ out[i * 2 - 1] = stbi__div16(3 * t0 + t1 + 8);
+ out[i * 2] = stbi__div16(3 * t1 + t0 + 8);
+ }
+ out[w * 2 - 1] = stbi__div4(t1 + 2);
+
+ STBI_NOTUSED(hs);
+
+ return out;
+}
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static stbi_uc* stbi__resample_row_hv_2_simd(stbi_uc* out, stbi_uc* in_near, stbi_uc* in_far, int w, int hs) {+ // need to generate 2x2 samples for every one in input
+ int i = 0, t0, t1;
+
+ if (w == 1) {+ out[0] = out[1] = stbi__div4(3 * in_near[0] + in_far[0] + 2);
+ return out;
+ }
+
+ t1 = 3 * in_near[0] + in_far[0];
+ // process groups of 8 pixels for as long as we can.
+ // note we can't handle the last pixel in a row in this loop
+ // because we need to handle the filter boundary conditions.
+ for (; i < ((w - 1) & ~7); i += 8) {+#if defined(STBI_SSE2)
+ // load and perform the vertical filtering pass
+ // this uses 3*x + y = 4*x + (y - x)
+ __m128i zero = _mm_setzero_si128();
+ __m128i farb = _mm_loadl_epi64((__m128i*)(in_far + i));
+ __m128i nearb = _mm_loadl_epi64((__m128i*)(in_near + i));
+ __m128i farw = _mm_unpacklo_epi8(farb, zero);
+ __m128i nearw = _mm_unpacklo_epi8(nearb, zero);
+ __m128i diff = _mm_sub_epi16(farw, nearw);
+ __m128i nears = _mm_slli_epi16(nearw, 2);
+ __m128i curr = _mm_add_epi16(nears, diff); // current row
+
+ // horizontal filter works the same based on shifted vers of current
+ // row. "prev" is current row shifted right by 1 pixel; we need to
+ // insert the previous pixel value (from t1).
+ // "next" is current row shifted left by 1 pixel, with first pixel
+ // of next block of 8 pixels added in.
+ __m128i prv0 = _mm_slli_si128(curr, 2);
+ __m128i nxt0 = _mm_srli_si128(curr, 2);
+ __m128i prev = _mm_insert_epi16(prv0, t1, 0);
+ __m128i next = _mm_insert_epi16(nxt0, 3 * in_near[i + 8] + in_far[i + 8], 7);
+
+ // horizontal filter, polyphase implementation since it's convenient:
+ // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+ // odd pixels = 3*cur + next = cur*4 + (next - cur)
+ // note the shared term.
+ __m128i bias = _mm_set1_epi16(8);
+ __m128i curs = _mm_slli_epi16(curr, 2);
+ __m128i prvd = _mm_sub_epi16(prev, curr);
+ __m128i nxtd = _mm_sub_epi16(next, curr);
+ __m128i curb = _mm_add_epi16(curs, bias);
+ __m128i even = _mm_add_epi16(prvd, curb);
+ __m128i odd = _mm_add_epi16(nxtd, curb);
+
+ // interleave even and odd pixels, then undo scaling.
+ __m128i int0 = _mm_unpacklo_epi16(even, odd);
+ __m128i int1 = _mm_unpackhi_epi16(even, odd);
+ __m128i de0 = _mm_srli_epi16(int0, 4);
+ __m128i de1 = _mm_srli_epi16(int1, 4);
+
+ // pack and write output
+ __m128i outv = _mm_packus_epi16(de0, de1);
+ _mm_storeu_si128((__m128i*)(out + i * 2), outv);
+#elif defined(STBI_NEON)
+ // load and perform the vertical filtering pass
+ // this uses 3*x + y = 4*x + (y - x)
+ uint8x8_t farb = vld1_u8(in_far + i);
+ uint8x8_t nearb = vld1_u8(in_near + i);
+ int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
+ int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
+ int16x8_t curr = vaddq_s16(nears, diff); // current row
+
+ // horizontal filter works the same based on shifted vers of current
+ // row. "prev" is current row shifted right by 1 pixel; we need to
+ // insert the previous pixel value (from t1).
+ // "next" is current row shifted left by 1 pixel, with first pixel
+ // of next block of 8 pixels added in.
+ int16x8_t prv0 = vextq_s16(curr, curr, 7);
+ int16x8_t nxt0 = vextq_s16(curr, curr, 1);
+ int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
+ int16x8_t next = vsetq_lane_s16(3 * in_near[i + 8] + in_far[i + 8], nxt0, 7);
+
+ // horizontal filter, polyphase implementation since it's convenient:
+ // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+ // odd pixels = 3*cur + next = cur*4 + (next - cur)
+ // note the shared term.
+ int16x8_t curs = vshlq_n_s16(curr, 2);
+ int16x8_t prvd = vsubq_s16(prev, curr);
+ int16x8_t nxtd = vsubq_s16(next, curr);
+ int16x8_t even = vaddq_s16(curs, prvd);
+ int16x8_t odd = vaddq_s16(curs, nxtd);
+
+ // undo scaling and round, then store with even/odd phases interleaved
+ uint8x8x2_t o;
+ o.val[0] = vqrshrun_n_s16(even, 4);
+ o.val[1] = vqrshrun_n_s16(odd, 4);
+ vst2_u8(out + i * 2, o);
+#endif
+
+ // "previous" value for next iter
+ t1 = 3 * in_near[i + 7] + in_far[i + 7];
+ }
+
+ t0 = t1;
+ t1 = 3 * in_near[i] + in_far[i];
+ out[i * 2] = stbi__div16(3 * t1 + t0 + 8);
+
+ for (++i; i < w; ++i) {+ t0 = t1;
+ t1 = 3 * in_near[i] + in_far[i];
+ out[i * 2 - 1] = stbi__div16(3 * t0 + t1 + 8);
+ out[i * 2] = stbi__div16(3 * t1 + t0 + 8);
+ }
+ out[w * 2 - 1] = stbi__div4(t1 + 2);
+
+ STBI_NOTUSED(hs);
+
+ return out;
+}
+#endif
+
+static stbi_uc* stbi__resample_row_generic(stbi_uc* out, stbi_uc* in_near, stbi_uc* in_far, int w, int hs) {+ // resample with nearest-neighbor
+ int i, j;
+ STBI_NOTUSED(in_far);
+ for (i = 0; i < w; ++i)
+ for (j = 0; j < hs; ++j)
+ out[i * hs + j] = in_near[i];
+ return out;
+}
+
+// this is a reduced-precision calculation of YCbCr-to-RGB introduced
+// to make sure the code produces the same results in both SIMD and scalar
+#define stbi__float2fixed(x) (((int)((x)*4096.0f + 0.5f)) << 8)
+static void stbi__YCbCr_to_RGB_row(stbi_uc* out, const stbi_uc* y, const stbi_uc* pcb, const stbi_uc* pcr, int count, int step) {+ int i;
+ for (i = 0; i < count; ++i) {+ int y_fixed = (y[i] << 20) + (1 << 19); // rounding
+ int r, g, b;
+ int cr = pcr[i] - 128;
+ int cb = pcb[i] - 128;
+ r = y_fixed + cr * stbi__float2fixed(1.40200f);
+ g = y_fixed + (cr * -stbi__float2fixed(0.71414f)) + ((cb * -stbi__float2fixed(0.34414f)) & 0xffff0000);
+ b = y_fixed + cb * stbi__float2fixed(1.77200f);
+ r >>= 20;
+ g >>= 20;
+ b >>= 20;
+ if ((unsigned)r > 255) {+ if (r < 0)
+ r = 0;
+ else
+ r = 255;
+ }
+ if ((unsigned)g > 255) {+ if (g < 0)
+ g = 0;
+ else
+ g = 255;
+ }
+ if ((unsigned)b > 255) {+ if (b < 0)
+ b = 0;
+ else
+ b = 255;
+ }
+ out[0] = (stbi_uc)r;
+ out[1] = (stbi_uc)g;
+ out[2] = (stbi_uc)b;
+ out[3] = 255;
+ out += step;
+ }
+}
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static void stbi__YCbCr_to_RGB_simd(stbi_uc* out, stbi_uc const* y, stbi_uc const* pcb, stbi_uc const* pcr, int count, int step) {+ int i = 0;
+
+#ifdef STBI_SSE2
+ // step == 3 is pretty ugly on the final interleave, and i'm not convinced
+ // it's useful in practice (you wouldn't use it for textures, for example).
+ // so just accelerate step == 4 case.
+ if (step == 4) {+ // this is a fairly straightforward implementation and not
+ // super-optimized.
+ __m128i signflip = _mm_set1_epi8(-0x80);
+ __m128i cr_const0 = _mm_set1_epi16((short)(1.40200f * 4096.0f + 0.5f));
+ __m128i cr_const1 = _mm_set1_epi16(-(short)(0.71414f * 4096.0f + 0.5f));
+ __m128i cb_const0 = _mm_set1_epi16(-(short)(0.34414f * 4096.0f + 0.5f));
+ __m128i cb_const1 = _mm_set1_epi16((short)(1.77200f * 4096.0f + 0.5f));
+ __m128i y_bias = _mm_set1_epi8((char)(unsigned char)128);
+ __m128i xw = _mm_set1_epi16(255); // alpha channel
+
+ for (; i + 7 < count; i += 8) {+ // load
+ __m128i y_bytes = _mm_loadl_epi64((__m128i*)(y + i));
+ __m128i cr_bytes = _mm_loadl_epi64((__m128i*)(pcr + i));
+ __m128i cb_bytes = _mm_loadl_epi64((__m128i*)(pcb + i));
+ __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
+ __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
+
+ // unpack to short (and left-shift cr, cb by 8)
+ __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes);
+ __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
+ __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
+
+ // color transform
+ __m128i yws = _mm_srli_epi16(yw, 4);
+ __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
+ __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
+ __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
+ __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
+ __m128i rws = _mm_add_epi16(cr0, yws);
+ __m128i gwt = _mm_add_epi16(cb0, yws);
+ __m128i bws = _mm_add_epi16(yws, cb1);
+ __m128i gws = _mm_add_epi16(gwt, cr1);
+
+ // descale
+ __m128i rw = _mm_srai_epi16(rws, 4);
+ __m128i bw = _mm_srai_epi16(bws, 4);
+ __m128i gw = _mm_srai_epi16(gws, 4);
+
+ // back to byte, set up for transpose
+ __m128i brb = _mm_packus_epi16(rw, bw);
+ __m128i gxb = _mm_packus_epi16(gw, xw);
+
+ // transpose to interleave channels
+ __m128i t0 = _mm_unpacklo_epi8(brb, gxb);
+ __m128i t1 = _mm_unpackhi_epi8(brb, gxb);
+ __m128i o0 = _mm_unpacklo_epi16(t0, t1);
+ __m128i o1 = _mm_unpackhi_epi16(t0, t1);
+
+ // store
+ _mm_storeu_si128((__m128i*)(out + 0), o0);
+ _mm_storeu_si128((__m128i*)(out + 16), o1);
+ out += 32;
+ }
+ }
+#endif
+
+#ifdef STBI_NEON
+ // in this version, step=3 support would be easy to add. but is there
+ // demand?
+ if (step == 4) {+ // this is a fairly straightforward implementation and not
+ // super-optimized.
+ uint8x8_t signflip = vdup_n_u8(0x80);
+ int16x8_t cr_const0 = vdupq_n_s16((short)(1.40200f * 4096.0f + 0.5f));
+ int16x8_t cr_const1 = vdupq_n_s16(-(short)(0.71414f * 4096.0f + 0.5f));
+ int16x8_t cb_const0 = vdupq_n_s16(-(short)(0.34414f * 4096.0f + 0.5f));
+ int16x8_t cb_const1 = vdupq_n_s16((short)(1.77200f * 4096.0f + 0.5f));
+
+ for (; i + 7 < count; i += 8) {+ // load
+ uint8x8_t y_bytes = vld1_u8(y + i);
+ uint8x8_t cr_bytes = vld1_u8(pcr + i);
+ uint8x8_t cb_bytes = vld1_u8(pcb + i);
+ int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
+ int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
+
+ // expand to s16
+ int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
+ int16x8_t crw = vshll_n_s8(cr_biased, 7);
+ int16x8_t cbw = vshll_n_s8(cb_biased, 7);
+
+ // color transform
+ int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
+ int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
+ int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
+ int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
+ int16x8_t rws = vaddq_s16(yws, cr0);
+ int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
+ int16x8_t bws = vaddq_s16(yws, cb1);
+
+ // undo scaling, round, convert to byte
+ uint8x8x4_t o;
+ o.val[0] = vqrshrun_n_s16(rws, 4);
+ o.val[1] = vqrshrun_n_s16(gws, 4);
+ o.val[2] = vqrshrun_n_s16(bws, 4);
+ o.val[3] = vdup_n_u8(255);
+
+ // store, interleaving r/g/b/a
+ vst4_u8(out, o);
+ out += 8 * 4;
+ }
+ }
+#endif
+
+ for (; i < count; ++i) {+ int y_fixed = (y[i] << 20) + (1 << 19); // rounding
+ int r, g, b;
+ int cr = pcr[i] - 128;
+ int cb = pcb[i] - 128;
+ r = y_fixed + cr * stbi__float2fixed(1.40200f);
+ g = y_fixed + cr * -stbi__float2fixed(0.71414f) + ((cb * -stbi__float2fixed(0.34414f)) & 0xffff0000);
+ b = y_fixed + cb * stbi__float2fixed(1.77200f);
+ r >>= 20;
+ g >>= 20;
+ b >>= 20;
+ if ((unsigned)r > 255) {+ if (r < 0)
+ r = 0;
+ else
+ r = 255;
+ }
+ if ((unsigned)g > 255) {+ if (g < 0)
+ g = 0;
+ else
+ g = 255;
+ }
+ if ((unsigned)b > 255) {+ if (b < 0)
+ b = 0;
+ else
+ b = 255;
+ }
+ out[0] = (stbi_uc)r;
+ out[1] = (stbi_uc)g;
+ out[2] = (stbi_uc)b;
+ out[3] = 255;
+ out += step;
+ }
+}
+#endif
+
+// set up the kernels
+static void stbi__setup_jpeg(stbi__jpeg* j) {+ j->idct_block_kernel = stbi__idct_block;
+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
+
+#ifdef STBI_SSE2
+ if (stbi__sse2_available()) {+ j->idct_block_kernel = stbi__idct_simd;
+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+ }
+#endif
+
+#ifdef STBI_NEON
+ j->idct_block_kernel = stbi__idct_simd;
+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+#endif
+}
+
+// clean up the temporary component buffers
+static void stbi__cleanup_jpeg(stbi__jpeg* j) { stbi__free_jpeg_components(j, j->s->img_n, 0); }+
+typedef struct {+ resample_row_func resample;
+ stbi_uc *line0, *line1;
+ int hs, vs; // expansion factor in each axis
+ int w_lores; // horizontal pixels pre-expansion
+ int ystep; // how far through vertical expansion we are
+ int ypos; // which pre-expansion row we're on
+} stbi__resample;
+
+// fast 0..255 * 0..255 => 0..255 rounded multiplication
+static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y) {+ unsigned int t = x * y + 128;
+ return (stbi_uc)((t + (t >> 8)) >> 8);
+}
+
+static stbi_uc* load_jpeg_image(stbi__jpeg* z, int* out_x, int* out_y, int* comp, int req_comp) {+ int n, decode_n, is_rgb;
+ z->s->img_n = 0; // make stbi__cleanup_jpeg safe
+
+ // validate req_comp
+ if (req_comp < 0 || req_comp > 4)
+ return stbi__errpuc("bad req_comp", "Internal error");+
+ // load a jpeg image from whichever source, but leave in YCbCr format
+ if (!stbi__decode_jpeg_image(z)) {+ stbi__cleanup_jpeg(z);
+ return NULL;
+ }
+
+ // determine actual number of components to generate
+ n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1;
+
+ is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif));
+
+ if (z->s->img_n == 3 && n < 3 && !is_rgb)
+ decode_n = 1;
+ else
+ decode_n = z->s->img_n;
+
+ // resample and color-convert
+ {+ int k;
+ unsigned int i, j;
+ stbi_uc* output;
+ stbi_uc* coutput[4] = {NULL, NULL, NULL, NULL};+
+ stbi__resample res_comp[4];
+
+ for (k = 0; k < decode_n; ++k) {+ stbi__resample* r = &res_comp[k];
+
+ // allocate line buffer big enough for upsampling off the edges
+ // with upsample factor of 4
+ z->img_comp[k].linebuf = (stbi_uc*)stbi__malloc(z->s->img_x + 3);
+ if (!z->img_comp[k].linebuf) {+ stbi__cleanup_jpeg(z);
+ return stbi__errpuc("outofmem", "Out of memory");+ }
+
+ r->hs = z->img_h_max / z->img_comp[k].h;
+ r->vs = z->img_v_max / z->img_comp[k].v;
+ r->ystep = r->vs >> 1;
+ r->w_lores = (z->s->img_x + r->hs - 1) / r->hs;
+ r->ypos = 0;
+ r->line0 = r->line1 = z->img_comp[k].data;
+
+ if (r->hs == 1 && r->vs == 1)
+ r->resample = resample_row_1;
+ else if (r->hs == 1 && r->vs == 2)
+ r->resample = stbi__resample_row_v_2;
+ else if (r->hs == 2 && r->vs == 1)
+ r->resample = stbi__resample_row_h_2;
+ else if (r->hs == 2 && r->vs == 2)
+ r->resample = z->resample_row_hv_2_kernel;
+ else
+ r->resample = stbi__resample_row_generic;
+ }
+
+ // can't error after this so, this is safe
+ output = (stbi_uc*)stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1);
+ if (!output) {+ stbi__cleanup_jpeg(z);
+ return stbi__errpuc("outofmem", "Out of memory");+ }
+
+ // now go ahead and resample
+ for (j = 0; j < z->s->img_y; ++j) {+ stbi_uc* out = output + n * z->s->img_x * j;
+ for (k = 0; k < decode_n; ++k) {+ stbi__resample* r = &res_comp[k];
+ int y_bot = r->ystep >= (r->vs >> 1);
+ coutput[k] = r->resample(z->img_comp[k].linebuf, y_bot ? r->line1 : r->line0, y_bot ? r->line0 : r->line1, r->w_lores, r->hs);
+ if (++r->ystep >= r->vs) {+ r->ystep = 0;
+ r->line0 = r->line1;
+ if (++r->ypos < z->img_comp[k].y)
+ r->line1 += z->img_comp[k].w2;
+ }
+ }
+ if (n >= 3) {+ stbi_uc* y = coutput[0];
+ if (z->s->img_n == 3) {+ if (is_rgb) {+ for (i = 0; i < z->s->img_x; ++i) {+ out[0] = y[i];
+ out[1] = coutput[1][i];
+ out[2] = coutput[2][i];
+ out[3] = 255;
+ out += n;
+ }
+ } else {+ z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+ }
+ } else if (z->s->img_n == 4) {+ if (z->app14_color_transform == 0) { // CMYK+ for (i = 0; i < z->s->img_x; ++i) {+ stbi_uc m = coutput[3][i];
+ out[0] = stbi__blinn_8x8(coutput[0][i], m);
+ out[1] = stbi__blinn_8x8(coutput[1][i], m);
+ out[2] = stbi__blinn_8x8(coutput[2][i], m);
+ out[3] = 255;
+ out += n;
+ }
+ } else if (z->app14_color_transform == 2) { // YCCK+ z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+ for (i = 0; i < z->s->img_x; ++i) {+ stbi_uc m = coutput[3][i];
+ out[0] = stbi__blinn_8x8(255 - out[0], m);
+ out[1] = stbi__blinn_8x8(255 - out[1], m);
+ out[2] = stbi__blinn_8x8(255 - out[2], m);
+ out += n;
+ }
+ } else { // YCbCr + alpha? Ignore the fourth channel for+ // now
+ z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+ }
+ } else
+ for (i = 0; i < z->s->img_x; ++i) {+ out[0] = out[1] = out[2] = y[i];
+ out[3] = 255; // not used if n==3
+ out += n;
+ }
+ } else {+ if (is_rgb) {+ if (n == 1)
+ for (i = 0; i < z->s->img_x; ++i)
+ *out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
+ else {+ for (i = 0; i < z->s->img_x; ++i, out += 2) {+ out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
+ out[1] = 255;
+ }
+ }
+ } else if (z->s->img_n == 4 && z->app14_color_transform == 0) {+ for (i = 0; i < z->s->img_x; ++i) {+ stbi_uc m = coutput[3][i];
+ stbi_uc r = stbi__blinn_8x8(coutput[0][i], m);
+ stbi_uc g = stbi__blinn_8x8(coutput[1][i], m);
+ stbi_uc b = stbi__blinn_8x8(coutput[2][i], m);
+ out[0] = stbi__compute_y(r, g, b);
+ out[1] = 255;
+ out += n;
+ }
+ } else if (z->s->img_n == 4 && z->app14_color_transform == 2) {+ for (i = 0; i < z->s->img_x; ++i) {+ out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]);
+ out[1] = 255;
+ out += n;
+ }
+ } else {+ stbi_uc* y = coutput[0];
+ if (n == 1)
+ for (i = 0; i < z->s->img_x; ++i)
+ out[i] = y[i];
+ else
+ for (i = 0; i < z->s->img_x; ++i) {+ *out++ = y[i];
+ *out++ = 255;
+ }
+ }
+ }
+ }
+ stbi__cleanup_jpeg(z);
+ *out_x = z->s->img_x;
+ *out_y = z->s->img_y;
+ if (comp)
+ *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output
+ return output;
+ }
+}
+
+static void* stbi__jpeg_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri) {+ unsigned char* result;
+ stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg));
+ STBI_NOTUSED(ri);
+ j->s = s;
+ stbi__setup_jpeg(j);
+ result = load_jpeg_image(j, x, y, comp, req_comp);
+ STBI_FREE(j);
+ return result;
+}
+
+static int stbi__jpeg_test(stbi__context* s) {+ int r;
+ stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg));
+ j->s = s;
+ stbi__setup_jpeg(j);
+ r = stbi__decode_jpeg_header(j, STBI__SCAN_type);
+ stbi__rewind(s);
+ STBI_FREE(j);
+ return r;
+}
+
+static int stbi__jpeg_info_raw(stbi__jpeg* j, int* x, int* y, int* comp) {+ if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {+ stbi__rewind(j->s);
+ return 0;
+ }
+ if (x)
+ *x = j->s->img_x;
+ if (y)
+ *y = j->s->img_y;
+ if (comp)
+ *comp = j->s->img_n >= 3 ? 3 : 1;
+ return 1;
+}
+
+static int stbi__jpeg_info(stbi__context* s, int* x, int* y, int* comp) {+ int result;
+ stbi__jpeg* j = (stbi__jpeg*)(stbi__malloc(sizeof(stbi__jpeg)));
+ j->s = s;
+ result = stbi__jpeg_info_raw(j, x, y, comp);
+ STBI_FREE(j);
+ return result;
+}
+#endif
+
+// public domain zlib decode v0.2 Sean Barrett 2006-11-18
+// simple implementation
+// - all input must be provided in an upfront buffer
+// - all output is written to a single output buffer (can malloc/realloc)
+// performance
+// - fast huffman
+
+#ifndef STBI_NO_ZLIB
+
+// fast-way is faster to check than jpeg huffman, but slow way is slower
+#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables
+#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1)
+
+// zlib-style huffman encoding
+// (jpegs packs from left, zlib from right, so can't share code)
+typedef struct {+ stbi__uint16 fast[1 << STBI__ZFAST_BITS];
+ stbi__uint16 firstcode[16];
+ int maxcode[17];
+ stbi__uint16 firstsymbol[16];
+ stbi_uc size[288];
+ stbi__uint16 value[288];
+} stbi__zhuffman;
+
+stbi_inline static int stbi__bitreverse16(int n) {+ n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1);
+ n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2);
+ n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4);
+ n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8);
+ return n;
+}
+
+stbi_inline static int stbi__bit_reverse(int v, int bits) {+ STBI_ASSERT(bits <= 16);
+ // to bit reverse n bits, reverse 16 and shift
+ // e.g. 11 bits, bit reverse and shift away 5
+ return stbi__bitreverse16(v) >> (16 - bits);
+}
+
+static int stbi__zbuild_huffman(stbi__zhuffman* z, const stbi_uc* sizelist, int num) {+ int i, k = 0;
+ int code, next_code[16], sizes[17];
+
+ // DEFLATE spec for generating codes
+ memset(sizes, 0, sizeof(sizes));
+ memset(z->fast, 0, sizeof(z->fast));
+ for (i = 0; i < num; ++i)
+ ++sizes[sizelist[i]];
+ sizes[0] = 0;
+ for (i = 1; i < 16; ++i)
+ if (sizes[i] > (1 << i))
+ return stbi__err("bad sizes", "Corrupt PNG");+ code = 0;
+ for (i = 1; i < 16; ++i) {+ next_code[i] = code;
+ z->firstcode[i] = (stbi__uint16)code;
+ z->firstsymbol[i] = (stbi__uint16)k;
+ code = (code + sizes[i]);
+ if (sizes[i])
+ if (code - 1 >= (1 << i))
+ return stbi__err("bad codelengths", "Corrupt PNG");+ z->maxcode[i] = code << (16 - i); // preshift for inner loop
+ code <<= 1;
+ k += sizes[i];
+ }
+ z->maxcode[16] = 0x10000; // sentinel
+ for (i = 0; i < num; ++i) {+ int s = sizelist[i];
+ if (s) {+ int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
+ stbi__uint16 fastv = (stbi__uint16)((s << 9) | i);
+ z->size[c] = (stbi_uc)s;
+ z->value[c] = (stbi__uint16)i;
+ if (s <= STBI__ZFAST_BITS) {+ int j = stbi__bit_reverse(next_code[s], s);
+ while (j < (1 << STBI__ZFAST_BITS)) {+ z->fast[j] = fastv;
+ j += (1 << s);
+ }
+ }
+ ++next_code[s];
+ }
+ }
+ return 1;
+}
+
+// zlib-from-memory implementation for PNG reading
+// because PNG allows splitting the zlib stream arbitrarily,
+// and it's annoying structurally to have PNG call ZLIB call PNG,
+// we require PNG read all the IDATs and combine them into a single
+// memory buffer
+
+typedef struct {+ stbi_uc *zbuffer, *zbuffer_end;
+ int num_bits;
+ stbi__uint32 code_buffer;
+
+ char* zout;
+ char* zout_start;
+ char* zout_end;
+ int z_expandable;
+
+ stbi__zhuffman z_length, z_distance;
+} stbi__zbuf;
+
+stbi_inline static stbi_uc stbi__zget8(stbi__zbuf* z) {+ if (z->zbuffer >= z->zbuffer_end)
+ return 0;
+ return *z->zbuffer++;
+}
+
+static void stbi__fill_bits(stbi__zbuf* z) {+ do {+ STBI_ASSERT(z->code_buffer < (1U << z->num_bits));
+ z->code_buffer |= (unsigned int)stbi__zget8(z) << z->num_bits;
+ z->num_bits += 8;
+ } while (z->num_bits <= 24);
+}
+
+stbi_inline static unsigned int stbi__zreceive(stbi__zbuf* z, int n) {+ unsigned int k;
+ if (z->num_bits < n)
+ stbi__fill_bits(z);
+ k = z->code_buffer & ((1 << n) - 1);
+ z->code_buffer >>= n;
+ z->num_bits -= n;
+ return k;
+}
+
+static int stbi__zhuffman_decode_slowpath(stbi__zbuf* a, stbi__zhuffman* z) {+ int b, s, k;
+ // not resolved by fast table, so compute it the slow way
+ // use jpeg approach, which requires MSbits at top
+ k = stbi__bit_reverse(a->code_buffer, 16);
+ for (s = STBI__ZFAST_BITS + 1;; ++s)
+ if (k < z->maxcode[s])
+ break;
+ if (s == 16)
+ return -1; // invalid code!
+ // code size is s, so:
+ b = (k >> (16 - s)) - z->firstcode[s] + z->firstsymbol[s];
+ STBI_ASSERT(z->size[b] == s);
+ a->code_buffer >>= s;
+ a->num_bits -= s;
+ return z->value[b];
+}
+
+stbi_inline static int stbi__zhuffman_decode(stbi__zbuf* a, stbi__zhuffman* z) {+ int b, s;
+ if (a->num_bits < 16)
+ stbi__fill_bits(a);
+ b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
+ if (b) {+ s = b >> 9;
+ a->code_buffer >>= s;
+ a->num_bits -= s;
+ return b & 511;
+ }
+ return stbi__zhuffman_decode_slowpath(a, z);
+}
+
+static int stbi__zexpand(stbi__zbuf* z, char* zout,
+ int n) // need to make room for n bytes
+{+ char* q;
+ int cur, limit, old_limit;
+ z->zout = zout;
+ if (!z->z_expandable)
+ return stbi__err("output buffer limit", "Corrupt PNG");+ cur = (int)(z->zout - z->zout_start);
+ limit = old_limit = (int)(z->zout_end - z->zout_start);
+ while (cur + n > limit)
+ limit *= 2;
+ q = (char*)STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
+ STBI_NOTUSED(old_limit);
+ if (q == NULL)
+ return stbi__err("outofmem", "Out of memory");+ z->zout_start = q;
+ z->zout = q + cur;
+ z->zout_end = q + limit;
+ return 1;
+}
+
+static const int stbi__zlength_base[31] = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,+ 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
+
+static const int stbi__zlength_extra[31] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 0, 0};+
+static const int stbi__zdist_base[32] = {1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,+ 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577, 0, 0};
+
+static const int stbi__zdist_extra[32] = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};+
+static int stbi__parse_huffman_block(stbi__zbuf* a) {+ char* zout = a->zout;
+ for (;;) {+ int z = stbi__zhuffman_decode(a, &a->z_length);
+ if (z < 256) {+ if (z < 0)
+ return stbi__err("bad huffman code",+ "Corrupt PNG"); // error in huffman codes
+ if (zout >= a->zout_end) {+ if (!stbi__zexpand(a, zout, 1))
+ return 0;
+ zout = a->zout;
+ }
+ *zout++ = (char)z;
+ } else {+ stbi_uc* p;
+ int len, dist;
+ if (z == 256) {+ a->zout = zout;
+ return 1;
+ }
+ z -= 257;
+ len = stbi__zlength_base[z];
+ if (stbi__zlength_extra[z])
+ len += stbi__zreceive(a, stbi__zlength_extra[z]);
+ z = stbi__zhuffman_decode(a, &a->z_distance);
+ if (z < 0)
+ return stbi__err("bad huffman code", "Corrupt PNG");+ dist = stbi__zdist_base[z];
+ if (stbi__zdist_extra[z])
+ dist += stbi__zreceive(a, stbi__zdist_extra[z]);
+ if (zout - a->zout_start < dist)
+ return stbi__err("bad dist", "Corrupt PNG");+ if (zout + len > a->zout_end) {+ if (!stbi__zexpand(a, zout, len))
+ return 0;
+ zout = a->zout;
+ }
+ p = (stbi_uc*)(zout - dist);
+ if (dist == 1) { // run of one byte; common in images.+ stbi_uc v = *p;
+ if (len) {+ do
+ *zout++ = v;
+ while (--len);
+ }
+ } else {+ if (len) {+ do
+ *zout++ = *p++;
+ while (--len);
+ }
+ }
+ }
+ }
+}
+
+static int stbi__compute_huffman_codes(stbi__zbuf* a) {+ static const stbi_uc length_dezigzag[19] = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};+ stbi__zhuffman z_codelength;
+ stbi_uc lencodes[286 + 32 + 137]; // padding for maximum single op
+ stbi_uc codelength_sizes[19];
+ int i, n;
+
+ int hlit = stbi__zreceive(a, 5) + 257;
+ int hdist = stbi__zreceive(a, 5) + 1;
+ int hclen = stbi__zreceive(a, 4) + 4;
+ int ntot = hlit + hdist;
+
+ memset(codelength_sizes, 0, sizeof(codelength_sizes));
+ for (i = 0; i < hclen; ++i) {+ int s = stbi__zreceive(a, 3);
+ codelength_sizes[length_dezigzag[i]] = (stbi_uc)s;
+ }
+ if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19))
+ return 0;
+
+ n = 0;
+ while (n < ntot) {+ int c = stbi__zhuffman_decode(a, &z_codelength);
+ if (c < 0 || c >= 19)
+ return stbi__err("bad codelengths", "Corrupt PNG");+ if (c < 16)
+ lencodes[n++] = (stbi_uc)c;
+ else {+ stbi_uc fill = 0;
+ if (c == 16) {+ c = stbi__zreceive(a, 2) + 3;
+ if (n == 0)
+ return stbi__err("bad codelengths", "Corrupt PNG");+ fill = lencodes[n - 1];
+ } else if (c == 17)
+ c = stbi__zreceive(a, 3) + 3;
+ else {+ STBI_ASSERT(c == 18);
+ c = stbi__zreceive(a, 7) + 11;
+ }
+ if (ntot - n < c)
+ return stbi__err("bad codelengths", "Corrupt PNG");+ memset(lencodes + n, fill, c);
+ n += c;
+ }
+ }
+ if (n != ntot)
+ return stbi__err("bad codelengths", "Corrupt PNG");+ if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit))
+ return 0;
+ if (!stbi__zbuild_huffman(&a->z_distance, lencodes + hlit, hdist))
+ return 0;
+ return 1;
+}
+
+static int stbi__parse_uncompressed_block(stbi__zbuf* a) {+ stbi_uc header[4];
+ int len, nlen, k;
+ if (a->num_bits & 7)
+ stbi__zreceive(a, a->num_bits & 7); // discard
+ // drain the bit-packed data into header
+ k = 0;
+ while (a->num_bits > 0) {+ header[k++] = (stbi_uc)(a->code_buffer & 255); // suppress MSVC run-time check
+ a->code_buffer >>= 8;
+ a->num_bits -= 8;
+ }
+ STBI_ASSERT(a->num_bits == 0);
+ // now fill header the normal way
+ while (k < 4)
+ header[k++] = stbi__zget8(a);
+ len = header[1] * 256 + header[0];
+ nlen = header[3] * 256 + header[2];
+ if (nlen != (len ^ 0xffff))
+ return stbi__err("zlib corrupt", "Corrupt PNG");+ if (a->zbuffer + len > a->zbuffer_end)
+ return stbi__err("read past buffer", "Corrupt PNG");+ if (a->zout + len > a->zout_end)
+ if (!stbi__zexpand(a, a->zout, len))
+ return 0;
+ memcpy(a->zout, a->zbuffer, len);
+ a->zbuffer += len;
+ a->zout += len;
+ return 1;
+}
+
+static int stbi__parse_zlib_header(stbi__zbuf* a) {+ int cmf = stbi__zget8(a);
+ int cm = cmf & 15;
+ /* int cinfo = cmf >> 4; */
+ int flg = stbi__zget8(a);
+ if ((cmf * 256 + flg) % 31 != 0)
+ return stbi__err("bad zlib header", "Corrupt PNG"); // zlib spec+ if (flg & 32)
+ return stbi__err("no preset dict",+ "Corrupt PNG"); // preset dictionary not allowed in png
+ if (cm != 8)
+ return stbi__err("bad compression",+ "Corrupt PNG"); // DEFLATE required for png
+ // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
+ return 1;
+}
+
+static const stbi_uc stbi__zdefault_length[288] = {+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8};
+static const stbi_uc stbi__zdefault_distance[32] = {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5};+/*
+Init algorithm:
+{+ int i; // use <= to match clearly with spec
+ for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8;
+ for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9;
+ for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7;
+ for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8;
+
+ for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5;
+}
+*/
+
+static int stbi__parse_zlib(stbi__zbuf* a, int parse_header) {+ int final, type;
+ if (parse_header)
+ if (!stbi__parse_zlib_header(a))
+ return 0;
+ a->num_bits = 0;
+ a->code_buffer = 0;
+ do {+ final = stbi__zreceive(a, 1);
+ type = stbi__zreceive(a, 2);
+ if (type == 0) {+ if (!stbi__parse_uncompressed_block(a))
+ return 0;
+ } else if (type == 3) {+ return 0;
+ } else {+ if (type == 1) {+ // use fixed code lengths
+ if (!stbi__zbuild_huffman(&a->z_length, stbi__zdefault_length, 288))
+ return 0;
+ if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32))
+ return 0;
+ } else {+ if (!stbi__compute_huffman_codes(a))
+ return 0;
+ }
+ if (!stbi__parse_huffman_block(a))
+ return 0;
+ }
+ } while (!final);
+ return 1;
+}
+
+static int stbi__do_zlib(stbi__zbuf* a, char* obuf, int olen, int exp, int parse_header) {+ a->zout_start = obuf;
+ a->zout = obuf;
+ a->zout_end = obuf + olen;
+ a->z_expandable = exp;
+
+ return stbi__parse_zlib(a, parse_header);
+}
+
+STBIDEF char* stbi_zlib_decode_malloc_guesssize(const char* buffer, int len, int initial_size, int* outlen) {+ stbi__zbuf a;
+ char* p = (char*)stbi__malloc(initial_size);
+ if (p == NULL)
+ return NULL;
+ a.zbuffer = (stbi_uc*)buffer;
+ a.zbuffer_end = (stbi_uc*)buffer + len;
+ if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {+ if (outlen)
+ *outlen = (int)(a.zout - a.zout_start);
+ return a.zout_start;
+ } else {+ STBI_FREE(a.zout_start);
+ return NULL;
+ }
+}
+
+STBIDEF char* stbi_zlib_decode_malloc(char const* buffer, int len, int* outlen) { return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); }+
+STBIDEF char* stbi_zlib_decode_malloc_guesssize_headerflag(const char* buffer, int len, int initial_size, int* outlen, int parse_header) {+ stbi__zbuf a;
+ char* p = (char*)stbi__malloc(initial_size);
+ if (p == NULL)
+ return NULL;
+ a.zbuffer = (stbi_uc*)buffer;
+ a.zbuffer_end = (stbi_uc*)buffer + len;
+ if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {+ if (outlen)
+ *outlen = (int)(a.zout - a.zout_start);
+ return a.zout_start;
+ } else {+ STBI_FREE(a.zout_start);
+ return NULL;
+ }
+}
+
+STBIDEF int stbi_zlib_decode_buffer(char* obuffer, int olen, char const* ibuffer, int ilen) {+ stbi__zbuf a;
+ a.zbuffer = (stbi_uc*)ibuffer;
+ a.zbuffer_end = (stbi_uc*)ibuffer + ilen;
+ if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
+ return (int)(a.zout - a.zout_start);
+ else
+ return -1;
+}
+
+STBIDEF char* stbi_zlib_decode_noheader_malloc(char const* buffer, int len, int* outlen) {+ stbi__zbuf a;
+ char* p = (char*)stbi__malloc(16384);
+ if (p == NULL)
+ return NULL;
+ a.zbuffer = (stbi_uc*)buffer;
+ a.zbuffer_end = (stbi_uc*)buffer + len;
+ if (stbi__do_zlib(&a, p, 16384, 1, 0)) {+ if (outlen)
+ *outlen = (int)(a.zout - a.zout_start);
+ return a.zout_start;
+ } else {+ STBI_FREE(a.zout_start);
+ return NULL;
+ }
+}
+
+STBIDEF int stbi_zlib_decode_noheader_buffer(char* obuffer, int olen, const char* ibuffer, int ilen) {+ stbi__zbuf a;
+ a.zbuffer = (stbi_uc*)ibuffer;
+ a.zbuffer_end = (stbi_uc*)ibuffer + ilen;
+ if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
+ return (int)(a.zout - a.zout_start);
+ else
+ return -1;
+}
+#endif
+
+// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18
+// simple implementation
+// - only 8-bit samples
+// - no CRC checking
+// - allocates lots of intermediate memory
+// - avoids problem of streaming data between subsystems
+// - avoids explicit window management
+// performance
+// - uses stb_zlib, a PD zlib implementation with fast huffman decoding
+
+#ifndef STBI_NO_PNG
+typedef struct {+ stbi__uint32 length;
+ stbi__uint32 type;
+} stbi__pngchunk;
+
+static stbi__pngchunk stbi__get_chunk_header(stbi__context* s) {+ stbi__pngchunk c;
+ c.length = stbi__get32be(s);
+ c.type = stbi__get32be(s);
+ return c;
+}
+
+static int stbi__check_png_header(stbi__context* s) {+ static const stbi_uc png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};+ int i;
+ for (i = 0; i < 8; ++i)
+ if (stbi__get8(s) != png_sig[i])
+ return stbi__err("bad png sig", "Not a PNG");+ return 1;
+}
+
+typedef struct {+ stbi__context* s;
+ stbi_uc *idata, *expanded, *out;
+ int depth;
+} stbi__png;
+
+enum {+ STBI__F_none = 0,
+ STBI__F_sub = 1,
+ STBI__F_up = 2,
+ STBI__F_avg = 3,
+ STBI__F_paeth = 4,
+ // synthetic filters used for first scanline to avoid needing a dummy row of
+ // 0s
+ STBI__F_avg_first,
+ STBI__F_paeth_first
+};
+
+static stbi_uc first_row_filter[5] = {STBI__F_none, STBI__F_sub, STBI__F_none, STBI__F_avg_first, STBI__F_paeth_first};+
+static int stbi__paeth(int a, int b, int c) {+ int p = a + b - c;
+ int pa = abs(p - a);
+ int pb = abs(p - b);
+ int pc = abs(p - c);
+ if (pa <= pb && pa <= pc)
+ return a;
+ if (pb <= pc)
+ return b;
+ return c;
+}
+
+static const stbi_uc stbi__depth_scale_table[9] = {0, 0xff, 0x55, 0, 0x11, 0, 0, 0, 0x01};+
+// create the png data from post-deflated data
+static int stbi__create_png_image_raw(stbi__png* a, stbi_uc* raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color) {+ int bytes = (depth == 16 ? 2 : 1);
+ stbi__context* s = a->s;
+ stbi__uint32 i, j, stride = x * out_n * bytes;
+ stbi__uint32 img_len, img_width_bytes;
+ int k;
+ int img_n = s->img_n; // copy it into a local for later
+
+ int output_bytes = out_n * bytes;
+ int filter_bytes = img_n * bytes;
+ int width = x;
+
+ STBI_ASSERT(out_n == s->img_n || out_n == s->img_n + 1);
+ a->out = (stbi_uc*)stbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into
+ if (!a->out)
+ return stbi__err("outofmem", "Out of memory");+
+ if (!stbi__mad3sizes_valid(img_n, x, depth, 7))
+ return stbi__err("too large", "Corrupt PNG");+ img_width_bytes = (((img_n * x * depth) + 7) >> 3);
+ img_len = (img_width_bytes + 1) * y;
+
+ // we used to check for exact match between raw_len and img_len on
+ // non-interlaced PNGs, but issue #276 reported a PNG in the wild that had
+ // extra data at the end (all zeros), so just check for raw_len < img_len
+ // always.
+ if (raw_len < img_len)
+ return stbi__err("not enough pixels", "Corrupt PNG");+
+ for (j = 0; j < y; ++j) {+ stbi_uc* cur = a->out + stride * j;
+ stbi_uc* prior;
+ int filter = *raw++;
+
+ if (filter > 4)
+ return stbi__err("invalid filter", "Corrupt PNG");+
+ if (depth < 8) {+ STBI_ASSERT(img_width_bytes <= x);
+ cur += x * out_n - img_width_bytes; // store output to the rightmost img_len
+ // bytes, so we can decode in place
+ filter_bytes = 1;
+ width = img_width_bytes;
+ }
+ prior = cur - stride; // bugfix: need to compute this after 'cur +='
+ // computation above
+
+ // if first row, use special filter that doesn't sample previous row
+ if (j == 0)
+ filter = first_row_filter[filter];
+
+ // handle first byte explicitly
+ for (k = 0; k < filter_bytes; ++k) {+ switch (filter) {+ case STBI__F_none:
+ cur[k] = raw[k];
+ break;
+ case STBI__F_sub:
+ cur[k] = raw[k];
+ break;
+ case STBI__F_up:
+ cur[k] = STBI__BYTECAST(raw[k] + prior[k]);
+ break;
+ case STBI__F_avg:
+ cur[k] = STBI__BYTECAST(raw[k] + (prior[k] >> 1));
+ break;
+ case STBI__F_paeth:
+ cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0, prior[k], 0));
+ break;
+ case STBI__F_avg_first:
+ cur[k] = raw[k];
+ break;
+ case STBI__F_paeth_first:
+ cur[k] = raw[k];
+ break;
+ }
+ }
+
+ if (depth == 8) {+ if (img_n != out_n)
+ cur[img_n] = 255; // first pixel
+ raw += img_n;
+ cur += out_n;
+ prior += out_n;
+ } else if (depth == 16) {+ if (img_n != out_n) {+ cur[filter_bytes] = 255; // first pixel top byte
+ cur[filter_bytes + 1] = 255; // first pixel bottom byte
+ }
+ raw += filter_bytes;
+ cur += output_bytes;
+ prior += output_bytes;
+ } else {+ raw += 1;
+ cur += 1;
+ prior += 1;
+ }
+
+ // this is a little gross, so that we don't switch per-pixel or
+ // per-component
+ if (depth < 8 || img_n == out_n) {+ int nk = (width - 1) * filter_bytes;
+#define STBI__CASE(f) \
+ case f: \
+ for (k = 0; k < nk; ++k)
+ switch (filter) {+ // "none" filter turns into a memcpy here; make that explicit.
+ case STBI__F_none:
+ memcpy(cur, raw, nk);
+ break;
+ STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k - filter_bytes]); }+ break;
+ STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); }+ break;
+ STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k - filter_bytes]) >> 1)); }+ break;
+ STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k - filter_bytes], prior[k], prior[k - filter_bytes])); }+ break;
+ STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k - filter_bytes] >> 1)); }+ break;
+ STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k - filter_bytes], 0, 0)); }+ break;
+ }
+#undef STBI__CASE
+ raw += nk;
+ } else {+ STBI_ASSERT(img_n + 1 == out_n);
+#define STBI__CASE(f) \
+ case f: \
+ for (i = x - 1; i >= 1; --i, cur[filter_bytes] = 255, raw += filter_bytes, cur += output_bytes, prior += output_bytes) \
+ for (k = 0; k < filter_bytes; ++k)
+ switch (filter) {+ STBI__CASE(STBI__F_none) { cur[k] = raw[k]; }+ break;
+ STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k - output_bytes]); }+ break;
+ STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); }+ break;
+ STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k - output_bytes]) >> 1)); }+ break;
+ STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k - output_bytes], prior[k], prior[k - output_bytes])); }+ break;
+ STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k - output_bytes] >> 1)); }+ break;
+ STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k - output_bytes], 0, 0)); }+ break;
+ }
+#undef STBI__CASE
+
+ // the loop above sets the high byte of the pixels' alpha, but for
+ // 16 bit png files we also need the low byte set. we'll do that
+ // here.
+ if (depth == 16) {+ cur = a->out + stride * j; // start at the beginning of the row again
+ for (i = 0; i < x; ++i, cur += output_bytes) {+ cur[filter_bytes + 1] = 255;
+ }
+ }
+ }
+ }
+
+ // we make a separate pass to expand bits to pixels; for performance,
+ // this could run two scanlines behind the above code, so it won't
+ // intefere with filtering but will still be in the cache.
+ if (depth < 8) {+ for (j = 0; j < y; ++j) {+ stbi_uc* cur = a->out + stride * j;
+ stbi_uc* in = a->out + stride * j + x * out_n - img_width_bytes;
+ // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the
+ // common 8-bit path optimal at minimal cost for 1/2/4-bit png
+ // guarante byte alignment, if width is not multiple of 8/4/2 we'll
+ // decode dummy trailing data that will be skipped in the later loop
+ stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range
+
+ // note that the final byte might overshoot and write more data than
+ // desired. we can allocate enough data that this never writes out
+ // of memory, but it could also overwrite the next scanline. can it
+ // overwrite non-empty data on the next scanline? yes, consider
+ // 1-pixel-wide scanlines with 1-bit-per-pixel. so we need to
+ // explicitly clamp the final ones
+
+ if (depth == 4) {+ for (k = x * img_n; k >= 2; k -= 2, ++in) {+ *cur++ = scale * ((*in >> 4));
+ *cur++ = scale * ((*in) & 0x0f);
+ }
+ if (k > 0)
+ *cur++ = scale * ((*in >> 4));
+ } else if (depth == 2) {+ for (k = x * img_n; k >= 4; k -= 4, ++in) {+ *cur++ = scale * ((*in >> 6));
+ *cur++ = scale * ((*in >> 4) & 0x03);
+ *cur++ = scale * ((*in >> 2) & 0x03);
+ *cur++ = scale * ((*in) & 0x03);
+ }
+ if (k > 0)
+ *cur++ = scale * ((*in >> 6));
+ if (k > 1)
+ *cur++ = scale * ((*in >> 4) & 0x03);
+ if (k > 2)
+ *cur++ = scale * ((*in >> 2) & 0x03);
+ } else if (depth == 1) {+ for (k = x * img_n; k >= 8; k -= 8, ++in) {+ *cur++ = scale * ((*in >> 7));
+ *cur++ = scale * ((*in >> 6) & 0x01);
+ *cur++ = scale * ((*in >> 5) & 0x01);
+ *cur++ = scale * ((*in >> 4) & 0x01);
+ *cur++ = scale * ((*in >> 3) & 0x01);
+ *cur++ = scale * ((*in >> 2) & 0x01);
+ *cur++ = scale * ((*in >> 1) & 0x01);
+ *cur++ = scale * ((*in) & 0x01);
+ }
+ if (k > 0)
+ *cur++ = scale * ((*in >> 7));
+ if (k > 1)
+ *cur++ = scale * ((*in >> 6) & 0x01);
+ if (k > 2)
+ *cur++ = scale * ((*in >> 5) & 0x01);
+ if (k > 3)
+ *cur++ = scale * ((*in >> 4) & 0x01);
+ if (k > 4)
+ *cur++ = scale * ((*in >> 3) & 0x01);
+ if (k > 5)
+ *cur++ = scale * ((*in >> 2) & 0x01);
+ if (k > 6)
+ *cur++ = scale * ((*in >> 1) & 0x01);
+ }
+ if (img_n != out_n) {+ int q;
+ // insert alpha = 255
+ cur = a->out + stride * j;
+ if (img_n == 1) {+ for (q = x - 1; q >= 0; --q) {+ cur[q * 2 + 1] = 255;
+ cur[q * 2 + 0] = cur[q];
+ }
+ } else {+ STBI_ASSERT(img_n == 3);
+ for (q = x - 1; q >= 0; --q) {+ cur[q * 4 + 3] = 255;
+ cur[q * 4 + 2] = cur[q * 3 + 2];
+ cur[q * 4 + 1] = cur[q * 3 + 1];
+ cur[q * 4 + 0] = cur[q * 3 + 0];
+ }
+ }
+ }
+ }
+ } else if (depth == 16) {+ // force the image data from big-endian to platform-native.
+ // this is done in a separate pass due to the decoding relying
+ // on the data being untouched, but could probably be done
+ // per-line during decode if care is taken.
+ stbi_uc* cur = a->out;
+ stbi__uint16* cur16 = (stbi__uint16*)cur;
+
+ for (i = 0; i < x * y * out_n; ++i, cur16++, cur += 2) {+ *cur16 = (cur[0] << 8) | cur[1];
+ }
+ }
+
+ return 1;
+}
+
+static int stbi__create_png_image(stbi__png* a, stbi_uc* image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced) {+ int bytes = (depth == 16 ? 2 : 1);
+ int out_bytes = out_n * bytes;
+ stbi_uc* final;
+ int p;
+ if (!interlaced)
+ return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color);
+
+ // de-interlacing
+ final = (stbi_uc*)stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0);
+ for (p = 0; p < 7; ++p) {+ int xorig[] = {0, 4, 0, 2, 0, 1, 0};+ int yorig[] = {0, 0, 4, 0, 2, 0, 1};+ int xspc[] = {8, 8, 4, 4, 2, 2, 1};+ int yspc[] = {8, 8, 8, 4, 4, 2, 2};+ int i, j, x, y;
+ // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
+ x = (a->s->img_x - xorig[p] + xspc[p] - 1) / xspc[p];
+ y = (a->s->img_y - yorig[p] + yspc[p] - 1) / yspc[p];
+ if (x && y) {+ stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y;
+ if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) {+ STBI_FREE(final);
+ return 0;
+ }
+ for (j = 0; j < y; ++j) {+ for (i = 0; i < x; ++i) {+ int out_y = j * yspc[p] + yorig[p];
+ int out_x = i * xspc[p] + xorig[p];
+ memcpy(final + out_y * a->s->img_x * out_bytes + out_x * out_bytes, a->out + (j * x + i) * out_bytes, out_bytes);
+ }
+ }
+ STBI_FREE(a->out);
+ image_data += img_len;
+ image_data_len -= img_len;
+ }
+ }
+ a->out = final;
+
+ return 1;
+}
+
+static int stbi__compute_transparency(stbi__png* z, stbi_uc tc[3], int out_n) {+ stbi__context* s = z->s;
+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+ stbi_uc* p = z->out;
+
+ // compute color-based transparency, assuming we've
+ // already got 255 as the alpha value in the output
+ STBI_ASSERT(out_n == 2 || out_n == 4);
+
+ if (out_n == 2) {+ for (i = 0; i < pixel_count; ++i) {+ p[1] = (p[0] == tc[0] ? 0 : 255);
+ p += 2;
+ }
+ } else {+ for (i = 0; i < pixel_count; ++i) {+ if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+ p[3] = 0;
+ p += 4;
+ }
+ }
+ return 1;
+}
+
+static int stbi__compute_transparency16(stbi__png* z, stbi__uint16 tc[3], int out_n) {+ stbi__context* s = z->s;
+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+ stbi__uint16* p = (stbi__uint16*)z->out;
+
+ // compute color-based transparency, assuming we've
+ // already got 65535 as the alpha value in the output
+ STBI_ASSERT(out_n == 2 || out_n == 4);
+
+ if (out_n == 2) {+ for (i = 0; i < pixel_count; ++i) {+ p[1] = (p[0] == tc[0] ? 0 : 65535);
+ p += 2;
+ }
+ } else {+ for (i = 0; i < pixel_count; ++i) {+ if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+ p[3] = 0;
+ p += 4;
+ }
+ }
+ return 1;
+}
+
+static int stbi__expand_png_palette(stbi__png* a, stbi_uc* palette, int len, int pal_img_n) {+ stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y;
+ stbi_uc *p, *temp_out, *orig = a->out;
+
+ p = (stbi_uc*)stbi__malloc_mad2(pixel_count, pal_img_n, 0);
+ if (p == NULL)
+ return stbi__err("outofmem", "Out of memory");+
+ // between here and free(out) below, exitting would leak
+ temp_out = p;
+
+ if (pal_img_n == 3) {+ for (i = 0; i < pixel_count; ++i) {+ int n = orig[i] * 4;
+ p[0] = palette[n];
+ p[1] = palette[n + 1];
+ p[2] = palette[n + 2];
+ p += 3;
+ }
+ } else {+ for (i = 0; i < pixel_count; ++i) {+ int n = orig[i] * 4;
+ p[0] = palette[n];
+ p[1] = palette[n + 1];
+ p[2] = palette[n + 2];
+ p[3] = palette[n + 3];
+ p += 4;
+ }
+ }
+ STBI_FREE(a->out);
+ a->out = temp_out;
+
+ STBI_NOTUSED(len);
+
+ return 1;
+}
+
+static int stbi__unpremultiply_on_load = 0;
+static int stbi__de_iphone_flag = 0;
+
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) { stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply; }+
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) { stbi__de_iphone_flag = flag_true_if_should_convert; }+
+static void stbi__de_iphone(stbi__png* z) {+ stbi__context* s = z->s;
+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+ stbi_uc* p = z->out;
+
+ if (s->img_out_n == 3) { // convert bgr to rgb+ for (i = 0; i < pixel_count; ++i) {+ stbi_uc t = p[0];
+ p[0] = p[2];
+ p[2] = t;
+ p += 3;
+ }
+ } else {+ STBI_ASSERT(s->img_out_n == 4);
+ if (stbi__unpremultiply_on_load) {+ // convert bgr to rgb and unpremultiply
+ for (i = 0; i < pixel_count; ++i) {+ stbi_uc a = p[3];
+ stbi_uc t = p[0];
+ if (a) {+ stbi_uc half = a / 2;
+ p[0] = (p[2] * 255 + half) / a;
+ p[1] = (p[1] * 255 + half) / a;
+ p[2] = (t * 255 + half) / a;
+ } else {+ p[0] = p[2];
+ p[2] = t;
+ }
+ p += 4;
+ }
+ } else {+ // convert bgr to rgb
+ for (i = 0; i < pixel_count; ++i) {+ stbi_uc t = p[0];
+ p[0] = p[2];
+ p[2] = t;
+ p += 4;
+ }
+ }
+ }
+}
+
+#define STBI__PNG_TYPE(a, b, c, d) (((unsigned)(a) << 24) + ((unsigned)(b) << 16) + ((unsigned)(c) << 8) + (unsigned)(d))
+
+static int stbi__parse_png_file(stbi__png* z, int scan, int req_comp) {+ stbi_uc palette[1024], pal_img_n = 0;
+ stbi_uc has_trans = 0, tc[3] = {0};+ stbi__uint16 tc16[3];
+ stbi__uint32 ioff = 0, idata_limit = 0, i, pal_len = 0;
+ int first = 1, k, interlace = 0, color = 0, is_iphone = 0;
+ stbi__context* s = z->s;
+
+ z->expanded = NULL;
+ z->idata = NULL;
+ z->out = NULL;
+
+ if (!stbi__check_png_header(s))
+ return 0;
+
+ if (scan == STBI__SCAN_type)
+ return 1;
+
+ for (;;) {+ stbi__pngchunk c = stbi__get_chunk_header(s);
+ switch (c.type) {+ case STBI__PNG_TYPE('C', 'g', 'B', 'I'):+ is_iphone = 1;
+ stbi__skip(s, c.length);
+ break;
+ case STBI__PNG_TYPE('I', 'H', 'D', 'R'): {+ int comp, filter;
+ if (!first)
+ return stbi__err("multiple IHDR", "Corrupt PNG");+ first = 0;
+ if (c.length != 13)
+ return stbi__err("bad IHDR len", "Corrupt PNG");+ s->img_x = stbi__get32be(s);
+ if (s->img_x > (1 << 24))
+ return stbi__err("too large", "Very large image (corrupt?)");+ s->img_y = stbi__get32be(s);
+ if (s->img_y > (1 << 24))
+ return stbi__err("too large", "Very large image (corrupt?)");+ z->depth = stbi__get8(s);
+ if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16)
+ return stbi__err("1/2/4/8/16-bit only", "PNG not supported: 1/2/4/8/16-bit only");+ color = stbi__get8(s);
+ if (color > 6)
+ return stbi__err("bad ctype", "Corrupt PNG");+ if (color == 3 && z->depth == 16)
+ return stbi__err("bad ctype", "Corrupt PNG");+ if (color == 3)
+ pal_img_n = 3;
+ else if (color & 1)
+ return stbi__err("bad ctype", "Corrupt PNG");+ comp = stbi__get8(s);
+ if (comp)
+ return stbi__err("bad comp method", "Corrupt PNG");+ filter = stbi__get8(s);
+ if (filter)
+ return stbi__err("bad filter method", "Corrupt PNG");+ interlace = stbi__get8(s);
+ if (interlace > 1)
+ return stbi__err("bad interlace method", "Corrupt PNG");+ if (!s->img_x || !s->img_y)
+ return stbi__err("0-pixel image", "Corrupt PNG");+ if (!pal_img_n) {+ s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
+ if ((1 << 30) / s->img_x / s->img_n < s->img_y)
+ return stbi__err("too large", "Image too large to decode");+ if (scan == STBI__SCAN_header)
+ return 1;
+ } else {+ // if paletted, then pal_n is our final components, and
+ // img_n is # components to decompress/filter.
+ s->img_n = 1;
+ if ((1 << 30) / s->img_x / 4 < s->img_y)
+ return stbi__err("too large", "Corrupt PNG");+ // if SCAN_header, have to scan to see if we have a tRNS
+ }
+ break;
+ }
+
+ case STBI__PNG_TYPE('P', 'L', 'T', 'E'): {+ if (first)
+ return stbi__err("first not IHDR", "Corrupt PNG");+ if (c.length > 256 * 3)
+ return stbi__err("invalid PLTE", "Corrupt PNG");+ pal_len = c.length / 3;
+ if (pal_len * 3 != c.length)
+ return stbi__err("invalid PLTE", "Corrupt PNG");+ for (i = 0; i < pal_len; ++i) {+ palette[i * 4 + 0] = stbi__get8(s);
+ palette[i * 4 + 1] = stbi__get8(s);
+ palette[i * 4 + 2] = stbi__get8(s);
+ palette[i * 4 + 3] = 255;
+ }
+ break;
+ }
+
+ case STBI__PNG_TYPE('t', 'R', 'N', 'S'): {+ if (first)
+ return stbi__err("first not IHDR", "Corrupt PNG");+ if (z->idata)
+ return stbi__err("tRNS after IDAT", "Corrupt PNG");+ if (pal_img_n) {+ if (scan == STBI__SCAN_header) {+ s->img_n = 4;
+ return 1;
+ }
+ if (pal_len == 0)
+ return stbi__err("tRNS before PLTE", "Corrupt PNG");+ if (c.length > pal_len)
+ return stbi__err("bad tRNS len", "Corrupt PNG");+ pal_img_n = 4;
+ for (i = 0; i < c.length; ++i)
+ palette[i * 4 + 3] = stbi__get8(s);
+ } else {+ if (!(s->img_n & 1))
+ return stbi__err("tRNS with alpha", "Corrupt PNG");+ if (c.length != (stbi__uint32)s->img_n * 2)
+ return stbi__err("bad tRNS len", "Corrupt PNG");+ has_trans = 1;
+ if (z->depth == 16) {+ for (k = 0; k < s->img_n; ++k)
+ tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
+ } else {+ for (k = 0; k < s->img_n; ++k)
+ tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit
+ // images will be
+ // larger
+ }
+ }
+ break;
+ }
+
+ case STBI__PNG_TYPE('I', 'D', 'A', 'T'): {+ if (first)
+ return stbi__err("first not IHDR", "Corrupt PNG");+ if (pal_img_n && !pal_len)
+ return stbi__err("no PLTE", "Corrupt PNG");+ if (scan == STBI__SCAN_header) {+ s->img_n = pal_img_n;
+ return 1;
+ }
+ if ((int)(ioff + c.length) < (int)ioff)
+ return 0;
+ if (ioff + c.length > idata_limit) {+ stbi__uint32 idata_limit_old = idata_limit;
+ stbi_uc* p;
+ if (idata_limit == 0)
+ idata_limit = c.length > 4096 ? c.length : 4096;
+ while (ioff + c.length > idata_limit)
+ idata_limit *= 2;
+ STBI_NOTUSED(idata_limit_old);
+ p = (stbi_uc*)STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit);
+ if (p == NULL)
+ return stbi__err("outofmem", "Out of memory");+ z->idata = p;
+ }
+ if (!stbi__getn(s, z->idata + ioff, c.length))
+ return stbi__err("outofdata", "Corrupt PNG");+ ioff += c.length;
+ break;
+ }
+
+ case STBI__PNG_TYPE('I', 'E', 'N', 'D'): {+ stbi__uint32 raw_len, bpl;
+ if (first)
+ return stbi__err("first not IHDR", "Corrupt PNG");+ if (scan != STBI__SCAN_load)
+ return 1;
+ if (z->idata == NULL)
+ return stbi__err("no IDAT", "Corrupt PNG");+ // initial guess for decoded data size to avoid unnecessary reallocs
+ bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component
+ raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */;
+ z->expanded = (stbi_uc*)stbi_zlib_decode_malloc_guesssize_headerflag((char*)z->idata, ioff, raw_len, (int*)&raw_len, !is_iphone);
+ if (z->expanded == NULL)
+ return 0; // zlib should set error
+ STBI_FREE(z->idata);
+ z->idata = NULL;
+ if ((req_comp == s->img_n + 1 && req_comp != 3 && !pal_img_n) || has_trans)
+ s->img_out_n = s->img_n + 1;
+ else
+ s->img_out_n = s->img_n;
+ if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color, interlace))
+ return 0;
+ if (has_trans) {+ if (z->depth == 16) {+ if (!stbi__compute_transparency16(z, tc16, s->img_out_n))
+ return 0;
+ } else {+ if (!stbi__compute_transparency(z, tc, s->img_out_n))
+ return 0;
+ }
+ }
+ if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2)
+ stbi__de_iphone(z);
+ if (pal_img_n) {+ // pal_img_n == 3 or 4
+ s->img_n = pal_img_n; // record the actual colors we had
+ s->img_out_n = pal_img_n;
+ if (req_comp >= 3)
+ s->img_out_n = req_comp;
+ if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n))
+ return 0;
+ } else if (has_trans) {+ // non-paletted image with tRNS -> source image has (constant)
+ // alpha
+ ++s->img_n;
+ }
+ STBI_FREE(z->expanded);
+ z->expanded = NULL;
+ // end of PNG chunk, read and skip CRC
+ stbi__get32be(s);
+ return 1;
+ }
+
+ default:
+ // if critical, fail
+ if (first)
+ return stbi__err("first not IHDR", "Corrupt PNG");+ if ((c.type & (1 << 29)) == 0) {+#ifndef STBI_NO_FAILURE_STRINGS
+ // not threadsafe
+ static char invalid_chunk[] = "XXXX PNG chunk not known";
+ invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
+ invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
+ invalid_chunk[2] = STBI__BYTECAST(c.type >> 8);
+ invalid_chunk[3] = STBI__BYTECAST(c.type >> 0);
+#endif
+ return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type");
+ }
+ stbi__skip(s, c.length);
+ break;
+ }
+ // end of PNG chunk, read and skip CRC
+ stbi__get32be(s);
+ }
+}
+
+static void* stbi__do_png(stbi__png* p, int* x, int* y, int* n, int req_comp, stbi__result_info* ri) {+ void* result = NULL;
+ if (req_comp < 0 || req_comp > 4)
+ return stbi__errpuc("bad req_comp", "Internal error");+ if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) {+ if (p->depth < 8)
+ ri->bits_per_channel = 8;
+ else
+ ri->bits_per_channel = p->depth;
+ result = p->out;
+ p->out = NULL;
+ if (req_comp && req_comp != p->s->img_out_n) {+ if (ri->bits_per_channel == 8)
+ result = stbi__convert_format((unsigned char*)result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
+ else
+ result = stbi__convert_format16((stbi__uint16*)result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
+ p->s->img_out_n = req_comp;
+ if (result == NULL)
+ return result;
+ }
+ *x = p->s->img_x;
+ *y = p->s->img_y;
+ if (n)
+ *n = p->s->img_n;
+ }
+ STBI_FREE(p->out);
+ p->out = NULL;
+ STBI_FREE(p->expanded);
+ p->expanded = NULL;
+ STBI_FREE(p->idata);
+ p->idata = NULL;
+
+ return result;
+}
+
+static void* stbi__png_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri) {+ stbi__png p;
+ p.s = s;
+ return stbi__do_png(&p, x, y, comp, req_comp, ri);
+}
+
+static int stbi__png_test(stbi__context* s) {+ int r;
+ r = stbi__check_png_header(s);
+ stbi__rewind(s);
+ return r;
+}
+
+static int stbi__png_info_raw(stbi__png* p, int* x, int* y, int* comp) {+ if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {+ stbi__rewind(p->s);
+ return 0;
+ }
+ if (x)
+ *x = p->s->img_x;
+ if (y)
+ *y = p->s->img_y;
+ if (comp)
+ *comp = p->s->img_n;
+ return 1;
+}
+
+static int stbi__png_info(stbi__context* s, int* x, int* y, int* comp) {+ stbi__png p;
+ p.s = s;
+ return stbi__png_info_raw(&p, x, y, comp);
+}
+
+static int stbi__png_is16(stbi__context* s) {+ stbi__png p;
+ p.s = s;
+ if (!stbi__png_info_raw(&p, NULL, NULL, NULL))
+ return 0;
+ if (p.depth != 16) {+ stbi__rewind(p.s);
+ return 0;
+ }
+ return 1;
+}
+#endif
+
+// Microsoft/Windows BMP image
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_test_raw(stbi__context* s) {+ int r;
+ int sz;
+ if (stbi__get8(s) != 'B')
+ return 0;
+ if (stbi__get8(s) != 'M')
+ return 0;
+ stbi__get32le(s); // discard filesize
+ stbi__get16le(s); // discard reserved
+ stbi__get16le(s); // discard reserved
+ stbi__get32le(s); // discard data offset
+ sz = stbi__get32le(s);
+ r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
+ return r;
+}
+
+static int stbi__bmp_test(stbi__context* s) {+ int r = stbi__bmp_test_raw(s);
+ stbi__rewind(s);
+ return r;
+}
+
+// returns 0..31 for the highest set bit
+static int stbi__high_bit(unsigned int z) {+ int n = 0;
+ if (z == 0)
+ return -1;
+ if (z >= 0x10000) {+ n += 16;
+ z >>= 16;
+ }
+ if (z >= 0x00100) {+ n += 8;
+ z >>= 8;
+ }
+ if (z >= 0x00010) {+ n += 4;
+ z >>= 4;
+ }
+ if (z >= 0x00004) {+ n += 2;
+ z >>= 2;
+ }
+ if (z >= 0x00002) {+ n += 1; /* >>= 1;*/
+ }
+ return n;
+}
+
+static int stbi__bitcount(unsigned int a) {+ a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2
+ a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4
+ a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
+ a = (a + (a >> 8)); // max 16 per 8 bits
+ a = (a + (a >> 16)); // max 32 per 8 bits
+ return a & 0xff;
+}
+
+// extract an arbitrarily-aligned N-bit value (N=bits)
+// from v, and then make it 8-bits long and fractionally
+// extend it to full full range.
+static int stbi__shiftsigned(unsigned int v, int shift, int bits) {+ static unsigned int mul_table[9] = {+ 0,
+ 0xff /*0b11111111*/,
+ 0x55 /*0b01010101*/,
+ 0x49 /*0b01001001*/,
+ 0x11 /*0b00010001*/,
+ 0x21 /*0b00100001*/,
+ 0x41 /*0b01000001*/,
+ 0x81 /*0b10000001*/,
+ 0x01 /*0b00000001*/,
+ };
+ static unsigned int shift_table[9] = {+ 0, 0, 0, 1, 0, 2, 4, 6, 0,
+ };
+ if (shift < 0)
+ v <<= -shift;
+ else
+ v >>= shift;
+ STBI_ASSERT(v < 256);
+ v >>= (8 - bits);
+ STBI_ASSERT(bits >= 0 && bits <= 8);
+ return (int)((unsigned)v * mul_table[bits]) >> shift_table[bits];
+}
+
+typedef struct {+ int bpp, offset, hsz;
+ unsigned int mr, mg, mb, ma, all_a;
+ int extra_read;
+} stbi__bmp_data;
+
+static void* stbi__bmp_parse_header(stbi__context* s, stbi__bmp_data* info) {+ int hsz;
+ if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M')
+ return stbi__errpuc("not BMP", "Corrupt BMP");+ stbi__get32le(s); // discard filesize
+ stbi__get16le(s); // discard reserved
+ stbi__get16le(s); // discard reserved
+ info->offset = stbi__get32le(s);
+ info->hsz = hsz = stbi__get32le(s);
+ info->mr = info->mg = info->mb = info->ma = 0;
+ info->extra_read = 14;
+
+ if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124)
+ return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");+ if (hsz == 12) {+ s->img_x = stbi__get16le(s);
+ s->img_y = stbi__get16le(s);
+ } else {+ s->img_x = stbi__get32le(s);
+ s->img_y = stbi__get32le(s);
+ }
+ if (stbi__get16le(s) != 1)
+ return stbi__errpuc("bad BMP", "bad BMP");+ info->bpp = stbi__get16le(s);
+ if (hsz != 12) {+ int compress = stbi__get32le(s);
+ if (compress == 1 || compress == 2)
+ return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");+ stbi__get32le(s); // discard sizeof
+ stbi__get32le(s); // discard hres
+ stbi__get32le(s); // discard vres
+ stbi__get32le(s); // discard colorsused
+ stbi__get32le(s); // discard max important
+ if (hsz == 40 || hsz == 56) {+ if (hsz == 56) {+ stbi__get32le(s);
+ stbi__get32le(s);
+ stbi__get32le(s);
+ stbi__get32le(s);
+ }
+ if (info->bpp == 16 || info->bpp == 32) {+ if (compress == 0) {+ if (info->bpp == 32) {+ info->mr = 0xffu << 16;
+ info->mg = 0xffu << 8;
+ info->mb = 0xffu << 0;
+ info->ma = 0xffu << 24;
+ info->all_a = 0; // if all_a is 0 at end, then we loaded
+ // alpha channel but it was all 0
+ } else {+ info->mr = 31u << 10;
+ info->mg = 31u << 5;
+ info->mb = 31u << 0;
+ }
+ } else if (compress == 3) {+ info->mr = stbi__get32le(s);
+ info->mg = stbi__get32le(s);
+ info->mb = stbi__get32le(s);
+ info->extra_read += 12;
+ // not documented, but generated by photoshop and handled by
+ // mspaint
+ if (info->mr == info->mg && info->mg == info->mb) {+ // ?!?!?
+ return stbi__errpuc("bad BMP", "bad BMP");+ }
+ } else
+ return stbi__errpuc("bad BMP", "bad BMP");+ }
+ } else {+ int i;
+ if (hsz != 108 && hsz != 124)
+ return stbi__errpuc("bad BMP", "bad BMP");+ info->mr = stbi__get32le(s);
+ info->mg = stbi__get32le(s);
+ info->mb = stbi__get32le(s);
+ info->ma = stbi__get32le(s);
+ stbi__get32le(s); // discard color space
+ for (i = 0; i < 12; ++i)
+ stbi__get32le(s); // discard color space parameters
+ if (hsz == 124) {+ stbi__get32le(s); // discard rendering intent
+ stbi__get32le(s); // discard offset of profile data
+ stbi__get32le(s); // discard size of profile data
+ stbi__get32le(s); // discard reserved
+ }
+ }
+ }
+ return (void*)1;
+}
+
+static void* stbi__bmp_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri) {+ stbi_uc* out;
+ unsigned int mr = 0, mg = 0, mb = 0, ma = 0, all_a;
+ stbi_uc pal[256][4];
+ int psize = 0, i, j, width;
+ int flip_vertically, pad, target;
+ stbi__bmp_data info;
+ STBI_NOTUSED(ri);
+
+ info.all_a = 255;
+ if (stbi__bmp_parse_header(s, &info) == NULL)
+ return NULL; // error code already set
+
+ flip_vertically = ((int)s->img_y) > 0;
+ s->img_y = abs((int)s->img_y);
+
+ mr = info.mr;
+ mg = info.mg;
+ mb = info.mb;
+ ma = info.ma;
+ all_a = info.all_a;
+
+ if (info.hsz == 12) {+ if (info.bpp < 24)
+ psize = (info.offset - info.extra_read - 24) / 3;
+ } else {+ if (info.bpp < 16)
+ psize = (info.offset - info.extra_read - info.hsz) >> 2;
+ }
+ if (psize == 0) {+ STBI_ASSERT(info.offset == (s->img_buffer - s->buffer_start));
+ }
+
+ if (info.bpp == 24 && ma == 0xff000000)
+ s->img_n = 3;
+ else
+ s->img_n = ma ? 4 : 3;
+ if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
+ target = req_comp;
+ else
+ target = s->img_n; // if they want monochrome, we'll post-convert
+
+ // sanity-check size
+ if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0))
+ return stbi__errpuc("too large", "Corrupt BMP");+
+ out = (stbi_uc*)stbi__malloc_mad3(target, s->img_x, s->img_y, 0);
+ if (!out)
+ return stbi__errpuc("outofmem", "Out of memory");+ if (info.bpp < 16) {+ int z = 0;
+ if (psize == 0 || psize > 256) {+ STBI_FREE(out);
+ return stbi__errpuc("invalid", "Corrupt BMP");+ }
+ for (i = 0; i < psize; ++i) {+ pal[i][2] = stbi__get8(s);
+ pal[i][1] = stbi__get8(s);
+ pal[i][0] = stbi__get8(s);
+ if (info.hsz != 12)
+ stbi__get8(s);
+ pal[i][3] = 255;
+ }
+ stbi__skip(s, info.offset - info.extra_read - info.hsz - psize * (info.hsz == 12 ? 3 : 4));
+ if (info.bpp == 1)
+ width = (s->img_x + 7) >> 3;
+ else if (info.bpp == 4)
+ width = (s->img_x + 1) >> 1;
+ else if (info.bpp == 8)
+ width = s->img_x;
+ else {+ STBI_FREE(out);
+ return stbi__errpuc("bad bpp", "Corrupt BMP");+ }
+ pad = (-width) & 3;
+ if (info.bpp == 1) {+ for (j = 0; j < (int)s->img_y; ++j) {+ int bit_offset = 7, v = stbi__get8(s);
+ for (i = 0; i < (int)s->img_x; ++i) {+ int color = (v >> bit_offset) & 0x1;
+ out[z++] = pal[color][0];
+ out[z++] = pal[color][1];
+ out[z++] = pal[color][2];
+ if (target == 4)
+ out[z++] = 255;
+ if (i + 1 == (int)s->img_x)
+ break;
+ if ((--bit_offset) < 0) {+ bit_offset = 7;
+ v = stbi__get8(s);
+ }
+ }
+ stbi__skip(s, pad);
+ }
+ } else {+ for (j = 0; j < (int)s->img_y; ++j) {+ for (i = 0; i < (int)s->img_x; i += 2) {+ int v = stbi__get8(s), v2 = 0;
+ if (info.bpp == 4) {+ v2 = v & 15;
+ v >>= 4;
+ }
+ out[z++] = pal[v][0];
+ out[z++] = pal[v][1];
+ out[z++] = pal[v][2];
+ if (target == 4)
+ out[z++] = 255;
+ if (i + 1 == (int)s->img_x)
+ break;
+ v = (info.bpp == 8) ? stbi__get8(s) : v2;
+ out[z++] = pal[v][0];
+ out[z++] = pal[v][1];
+ out[z++] = pal[v][2];
+ if (target == 4)
+ out[z++] = 255;
+ }
+ stbi__skip(s, pad);
+ }
+ }
+ } else {+ int rshift = 0, gshift = 0, bshift = 0, ashift = 0, rcount = 0, gcount = 0, bcount = 0, acount = 0;
+ int z = 0;
+ int easy = 0;
+ stbi__skip(s, info.offset - info.extra_read - info.hsz);
+ if (info.bpp == 24)
+ width = 3 * s->img_x;
+ else if (info.bpp == 16)
+ width = 2 * s->img_x;
+ else /* bpp = 32 and pad = 0 */
+ width = 0;
+ pad = (-width) & 3;
+ if (info.bpp == 24) {+ easy = 1;
+ } else if (info.bpp == 32) {+ if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
+ easy = 2;
+ }
+ if (!easy) {+ if (!mr || !mg || !mb) {+ STBI_FREE(out);
+ return stbi__errpuc("bad masks", "Corrupt BMP");+ }
+ // right shift amt to put high bit in position #7
+ rshift = stbi__high_bit(mr) - 7;
+ rcount = stbi__bitcount(mr);
+ gshift = stbi__high_bit(mg) - 7;
+ gcount = stbi__bitcount(mg);
+ bshift = stbi__high_bit(mb) - 7;
+ bcount = stbi__bitcount(mb);
+ ashift = stbi__high_bit(ma) - 7;
+ acount = stbi__bitcount(ma);
+ }
+ for (j = 0; j < (int)s->img_y; ++j) {+ if (easy) {+ for (i = 0; i < (int)s->img_x; ++i) {+ unsigned char a;
+ out[z + 2] = stbi__get8(s);
+ out[z + 1] = stbi__get8(s);
+ out[z + 0] = stbi__get8(s);
+ z += 3;
+ a = (easy == 2 ? stbi__get8(s) : 255);
+ all_a |= a;
+ if (target == 4)
+ out[z++] = a;
+ }
+ } else {+ int bpp = info.bpp;
+ for (i = 0; i < (int)s->img_x; ++i) {+ stbi__uint32 v = (bpp == 16 ? (stbi__uint32)stbi__get16le(s) : stbi__get32le(s));
+ unsigned int a;
+ out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount));
+ out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount));
+ out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount));
+ a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
+ all_a |= a;
+ if (target == 4)
+ out[z++] = STBI__BYTECAST(a);
+ }
+ }
+ stbi__skip(s, pad);
+ }
+ }
+
+ // if alpha channel is all 0s, replace with all 255s
+ if (target == 4 && all_a == 0)
+ for (i = 4 * s->img_x * s->img_y - 1; i >= 0; i -= 4)
+ out[i] = 255;
+
+ if (flip_vertically) {+ stbi_uc t;
+ for (j = 0; j<(int)s->img_y>> 1; ++j) {+ stbi_uc* p1 = out + j * s->img_x * target;
+ stbi_uc* p2 = out + (s->img_y - 1 - j) * s->img_x * target;
+ for (i = 0; i < (int)s->img_x * target; ++i) {+ t = p1[i];
+ p1[i] = p2[i];
+ p2[i] = t;
+ }
+ }
+ }
+
+ if (req_comp && req_comp != target) {+ out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y);
+ if (out == NULL)
+ return out; // stbi__convert_format frees input on failure
+ }
+
+ *x = s->img_x;
+ *y = s->img_y;
+ if (comp)
+ *comp = s->img_n;
+ return out;
+}
+#endif
+
+// Targa Truevision - TGA
+// by Jonathan Dummer
+#ifndef STBI_NO_TGA
+// returns STBI_rgb or whatever, 0 on error
+static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16) {+ // only RGB or RGBA (incl. 16bit) or grey allowed
+ if (is_rgb16)
+ *is_rgb16 = 0;
+ switch (bits_per_pixel) {+ case 8:
+ return STBI_grey;
+ case 16:
+ if (is_grey)
+ return STBI_grey_alpha;
+ // fallthrough
+ case 15:
+ if (is_rgb16)
+ *is_rgb16 = 1;
+ return STBI_rgb;
+ case 24: // fallthrough
+ case 32:
+ return bits_per_pixel / 8;
+ default:
+ return 0;
+ }
+}
+
+static int stbi__tga_info(stbi__context* s, int* x, int* y, int* comp) {+ int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp;
+ int sz, tga_colormap_type;
+ stbi__get8(s); // discard Offset
+ tga_colormap_type = stbi__get8(s); // colormap type
+ if (tga_colormap_type > 1) {+ stbi__rewind(s);
+ return 0; // only RGB or indexed allowed
+ }
+ tga_image_type = stbi__get8(s); // image type
+ if (tga_colormap_type == 1) { // colormapped (paletted) image+ if (tga_image_type != 1 && tga_image_type != 9) {+ stbi__rewind(s);
+ return 0;
+ }
+ stbi__skip(s,
+ 4); // skip index of first colormap entry and number of entries
+ sz = stbi__get8(s); // check bits per palette color entry
+ if ((sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32)) {+ stbi__rewind(s);
+ return 0;
+ }
+ stbi__skip(s, 4); // skip image x and y origin
+ tga_colormap_bpp = sz;
+ } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE+ if ((tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11)) {+ stbi__rewind(s);
+ return 0; // only RGB or grey allowed, +/- RLE
+ }
+ stbi__skip(s, 9); // skip colormap specification and image x/y origin
+ tga_colormap_bpp = 0;
+ }
+ tga_w = stbi__get16le(s);
+ if (tga_w < 1) {+ stbi__rewind(s);
+ return 0; // test width
+ }
+ tga_h = stbi__get16le(s);
+ if (tga_h < 1) {+ stbi__rewind(s);
+ return 0; // test height
+ }
+ tga_bits_per_pixel = stbi__get8(s); // bits per pixel
+ stbi__get8(s); // ignore alpha bits
+ if (tga_colormap_bpp != 0) {+ if ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) {+ // when using a colormap, tga_bits_per_pixel is the size of the
+ // indexes I don't think anything but 8 or 16bit indexes makes sense
+ stbi__rewind(s);
+ return 0;
+ }
+ tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL);
+ } else {+ tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL);
+ }
+ if (!tga_comp) {+ stbi__rewind(s);
+ return 0;
+ }
+ if (x)
+ *x = tga_w;
+ if (y)
+ *y = tga_h;
+ if (comp)
+ *comp = tga_comp;
+ return 1; // seems to have passed everything
+}
+
+static int stbi__tga_test(stbi__context* s) {+ int res = 0;
+ int sz, tga_color_type;
+ stbi__get8(s); // discard Offset
+ tga_color_type = stbi__get8(s); // color type
+ if (tga_color_type > 1)
+ goto errorEnd; // only RGB or indexed allowed
+ sz = stbi__get8(s); // image type
+ if (tga_color_type == 1) { // colormapped (paletted) image+ if (sz != 1 && sz != 9)
+ goto errorEnd; // colortype 1 demands image type 1 or 9
+ stbi__skip(s,
+ 4); // skip index of first colormap entry and number of entries
+ sz = stbi__get8(s); // check bits per palette color entry
+ if ((sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32))
+ goto errorEnd;
+ stbi__skip(s, 4); // skip image x and y origin
+ } else { // "normal" image w/o colormap+ if ((sz != 2) && (sz != 3) && (sz != 10) && (sz != 11))
+ goto errorEnd; // only RGB or grey allowed, +/- RLE
+ stbi__skip(s, 9); // skip colormap specification and image x/y origin
+ }
+ if (stbi__get16le(s) < 1)
+ goto errorEnd; // test width
+ if (stbi__get16le(s) < 1)
+ goto errorEnd; // test height
+ sz = stbi__get8(s); // bits per pixel
+ if ((tga_color_type == 1) && (sz != 8) && (sz != 16))
+ goto errorEnd; // for colormapped images, bpp is size of an index
+ if ((sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32))
+ goto errorEnd;
+
+ res = 1; // if we got this far, everything's good and we can return 1
+ // instead of 0
+
+errorEnd:
+ stbi__rewind(s);
+ return res;
+}
+
+// read 16bit value and convert to 24bit RGB
+static void stbi__tga_read_rgb16(stbi__context* s, stbi_uc* out) {+ stbi__uint16 px = (stbi__uint16)stbi__get16le(s);
+ stbi__uint16 fiveBitMask = 31;
+ // we have 3 channels with 5bits each
+ int r = (px >> 10) & fiveBitMask;
+ int g = (px >> 5) & fiveBitMask;
+ int b = px & fiveBitMask;
+ // Note that this saves the data in RGB(A) order, so it doesn't need to be
+ // swapped later
+ out[0] = (stbi_uc)((r * 255) / 31);
+ out[1] = (stbi_uc)((g * 255) / 31);
+ out[2] = (stbi_uc)((b * 255) / 31);
+
+ // some people claim that the most significant bit might be used for alpha
+ // (possibly if an alpha-bit is set in the "image descriptor byte")
+ // but that only made 16bit test images completely translucent..
+ // so let's treat all 15 and 16bit TGAs as RGB with no alpha.
+}
+
+static void* stbi__tga_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri) {+ // read in the TGA header stuff
+ int tga_offset = stbi__get8(s);
+ int tga_indexed = stbi__get8(s);
+ int tga_image_type = stbi__get8(s);
+ int tga_is_RLE = 0;
+ int tga_palette_start = stbi__get16le(s);
+ int tga_palette_len = stbi__get16le(s);
+ int tga_palette_bits = stbi__get8(s);
+ int tga_x_origin = stbi__get16le(s);
+ int tga_y_origin = stbi__get16le(s);
+ int tga_width = stbi__get16le(s);
+ int tga_height = stbi__get16le(s);
+ int tga_bits_per_pixel = stbi__get8(s);
+ int tga_comp, tga_rgb16 = 0;
+ int tga_inverted = stbi__get8(s);
+ // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused
+ // (useless?)
+ // image data
+ unsigned char* tga_data;
+ unsigned char* tga_palette = NULL;
+ int i, j;
+ unsigned char raw_data[4] = {0};+ int RLE_count = 0;
+ int RLE_repeating = 0;
+ int read_next_pixel = 1;
+ STBI_NOTUSED(ri);
+ STBI_NOTUSED(tga_x_origin); // @TODO
+ STBI_NOTUSED(tga_y_origin); // @TODO
+
+ // do a tiny bit of precessing
+ if (tga_image_type >= 8) {+ tga_image_type -= 8;
+ tga_is_RLE = 1;
+ }
+ tga_inverted = 1 - ((tga_inverted >> 5) & 1);
+
+ // If I'm paletted, then I'll use the number of bits from the palette
+ if (tga_indexed)
+ tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16);
+ else
+ tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16);
+
+ if (!tga_comp) // shouldn't really happen, stbi__tga_test() should have
+ // ensured basic consistency
+ return stbi__errpuc("bad format", "Can't find out TGA pixelformat");+
+ // tga info
+ *x = tga_width;
+ *y = tga_height;
+ if (comp)
+ *comp = tga_comp;
+
+ if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0))
+ return stbi__errpuc("too large", "Corrupt TGA");+
+ tga_data = (unsigned char*)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0);
+ if (!tga_data)
+ return stbi__errpuc("outofmem", "Out of memory");+
+ // skip to the data's starting position (offset usually = 0)
+ stbi__skip(s, tga_offset);
+
+ if (!tga_indexed && !tga_is_RLE && !tga_rgb16) {+ for (i = 0; i < tga_height; ++i) {+ int row = tga_inverted ? tga_height - i - 1 : i;
+ stbi_uc* tga_row = tga_data + row * tga_width * tga_comp;
+ stbi__getn(s, tga_row, tga_width * tga_comp);
+ }
+ } else {+ // do I need to load a palette?
+ if (tga_indexed) {+ // any data to skip? (offset usually = 0)
+ stbi__skip(s, tga_palette_start);
+ // load the palette
+ tga_palette = (unsigned char*)stbi__malloc_mad2(tga_palette_len, tga_comp, 0);
+ if (!tga_palette) {+ STBI_FREE(tga_data);
+ return stbi__errpuc("outofmem", "Out of memory");+ }
+ if (tga_rgb16) {+ stbi_uc* pal_entry = tga_palette;
+ STBI_ASSERT(tga_comp == STBI_rgb);
+ for (i = 0; i < tga_palette_len; ++i) {+ stbi__tga_read_rgb16(s, pal_entry);
+ pal_entry += tga_comp;
+ }
+ } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) {+ STBI_FREE(tga_data);
+ STBI_FREE(tga_palette);
+ return stbi__errpuc("bad palette", "Corrupt TGA");+ }
+ }
+ // load the data
+ for (i = 0; i < tga_width * tga_height; ++i) {+ // if I'm in RLE mode, do I need to get a RLE stbi__pngchunk?
+ if (tga_is_RLE) {+ if (RLE_count == 0) {+ // yep, get the next byte as a RLE command
+ int RLE_cmd = stbi__get8(s);
+ RLE_count = 1 + (RLE_cmd & 127);
+ RLE_repeating = RLE_cmd >> 7;
+ read_next_pixel = 1;
+ } else if (!RLE_repeating) {+ read_next_pixel = 1;
+ }
+ } else {+ read_next_pixel = 1;
+ }
+ // OK, if I need to read a pixel, do it now
+ if (read_next_pixel) {+ // load however much data we did have
+ if (tga_indexed) {+ // read in index, then perform the lookup
+ int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s);
+ if (pal_idx >= tga_palette_len) {+ // invalid index
+ pal_idx = 0;
+ }
+ pal_idx *= tga_comp;
+ for (j = 0; j < tga_comp; ++j) {+ raw_data[j] = tga_palette[pal_idx + j];
+ }
+ } else if (tga_rgb16) {+ STBI_ASSERT(tga_comp == STBI_rgb);
+ stbi__tga_read_rgb16(s, raw_data);
+ } else {+ // read in the data raw
+ for (j = 0; j < tga_comp; ++j) {+ raw_data[j] = stbi__get8(s);
+ }
+ }
+ // clear the reading flag for the next pixel
+ read_next_pixel = 0;
+ } // end of reading a pixel
+
+ // copy data
+ for (j = 0; j < tga_comp; ++j)
+ tga_data[i * tga_comp + j] = raw_data[j];
+
+ // in case we're in RLE mode, keep counting down
+ --RLE_count;
+ }
+ // do I need to invert the image?
+ if (tga_inverted) {+ for (j = 0; j * 2 < tga_height; ++j) {+ int index1 = j * tga_width * tga_comp;
+ int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
+ for (i = tga_width * tga_comp; i > 0; --i) {+ unsigned char temp = tga_data[index1];
+ tga_data[index1] = tga_data[index2];
+ tga_data[index2] = temp;
+ ++index1;
+ ++index2;
+ }
+ }
+ }
+ // clear my palette, if I had one
+ if (tga_palette != NULL) {+ STBI_FREE(tga_palette);
+ }
+ }
+
+ // swap RGB - if the source data was RGB16, it already is in the right order
+ if (tga_comp >= 3 && !tga_rgb16) {+ unsigned char* tga_pixel = tga_data;
+ for (i = 0; i < tga_width * tga_height; ++i) {+ unsigned char temp = tga_pixel[0];
+ tga_pixel[0] = tga_pixel[2];
+ tga_pixel[2] = temp;
+ tga_pixel += tga_comp;
+ }
+ }
+
+ // convert to target component count
+ if (req_comp && req_comp != tga_comp)
+ tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
+
+ // the things I do to get rid of an error message, and yet keep
+ // Microsoft's C compilers happy... [8^(
+ tga_palette_start = tga_palette_len = tga_palette_bits = tga_x_origin = tga_y_origin = 0;
+ STBI_NOTUSED(tga_palette_start);
+ // OK, done
+ return tga_data;
+}
+#endif
+
+// *************************************************************************************************
+// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz,
+// tweaked by STB
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_test(stbi__context* s) {+ int r = (stbi__get32be(s) == 0x38425053);
+ stbi__rewind(s);
+ return r;
+}
+
+static int stbi__psd_decode_rle(stbi__context* s, stbi_uc* p, int pixelCount) {+ int count, nleft, len;
+
+ count = 0;
+ while ((nleft = pixelCount - count) > 0) {+ len = stbi__get8(s);
+ if (len == 128) {+ // No-op.
+ } else if (len < 128) {+ // Copy next len+1 bytes literally.
+ len++;
+ if (len > nleft)
+ return 0; // corrupt data
+ count += len;
+ while (len) {+ *p = stbi__get8(s);
+ p += 4;
+ len--;
+ }
+ } else if (len > 128) {+ stbi_uc val;
+ // Next -len+1 bytes in the dest are replicated from next source
+ // byte. (Interpret len as a negative 8-bit int.)
+ len = 257 - len;
+ if (len > nleft)
+ return 0; // corrupt data
+ val = stbi__get8(s);
+ count += len;
+ while (len) {+ *p = val;
+ p += 4;
+ len--;
+ }
+ }
+ }
+
+ return 1;
+}
+
+static void* stbi__psd_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri, int bpc) {+ int pixelCount;
+ int channelCount, compression;
+ int channel, i;
+ int bitdepth;
+ int w, h;
+ stbi_uc* out;
+ STBI_NOTUSED(ri);
+
+ // Check identifier
+ if (stbi__get32be(s) != 0x38425053) // "8BPS"
+ return stbi__errpuc("not PSD", "Corrupt PSD image");+
+ // Check file type version.
+ if (stbi__get16be(s) != 1)
+ return stbi__errpuc("wrong version", "Unsupported version of PSD image");+
+ // Skip 6 reserved bytes.
+ stbi__skip(s, 6);
+
+ // Read the number of channels (R, G, B, A, etc).
+ channelCount = stbi__get16be(s);
+ if (channelCount < 0 || channelCount > 16)
+ return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image");+
+ // Read the rows and columns of the image.
+ h = stbi__get32be(s);
+ w = stbi__get32be(s);
+
+ // Make sure the depth is 8 bits.
+ bitdepth = stbi__get16be(s);
+ if (bitdepth != 8 && bitdepth != 16)
+ return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit");+
+ // Make sure the color mode is RGB.
+ // Valid options are:
+ // 0: Bitmap
+ // 1: Grayscale
+ // 2: Indexed color
+ // 3: RGB color
+ // 4: CMYK color
+ // 7: Multichannel
+ // 8: Duotone
+ // 9: Lab color
+ if (stbi__get16be(s) != 3)
+ return stbi__errpuc("wrong color format", "PSD is not in RGB color format");+
+ // Skip the Mode Data. (It's the palette for indexed color; other info for
+ // other modes.)
+ stbi__skip(s, stbi__get32be(s));
+
+ // Skip the image resources. (resolution, pen tool paths, etc)
+ stbi__skip(s, stbi__get32be(s));
+
+ // Skip the reserved data.
+ stbi__skip(s, stbi__get32be(s));
+
+ // Find out if the data is compressed.
+ // Known values:
+ // 0: no compression
+ // 1: RLE compressed
+ compression = stbi__get16be(s);
+ if (compression > 1)
+ return stbi__errpuc("bad compression", "PSD has an unknown compression format");+
+ // Check size
+ if (!stbi__mad3sizes_valid(4, w, h, 0))
+ return stbi__errpuc("too large", "Corrupt PSD");+
+ // Create the destination image.
+
+ if (!compression && bitdepth == 16 && bpc == 16) {+ out = (stbi_uc*)stbi__malloc_mad3(8, w, h, 0);
+ ri->bits_per_channel = 16;
+ } else
+ out = (stbi_uc*)stbi__malloc(4 * w * h);
+
+ if (!out)
+ return stbi__errpuc("outofmem", "Out of memory");+ pixelCount = w * h;
+
+ // Initialize the data to zero.
+ // memset( out, 0, pixelCount * 4 );
+
+ // Finally, the image data.
+ if (compression) {+ // RLE as used by .PSD and .TIFF
+ // Loop until you get the number of unpacked bytes you are expecting:
+ // Read the next source byte into n.
+ // If n is between 0 and 127 inclusive, copy the next n+1 bytes
+ // literally. Else if n is between -127 and -1 inclusive, copy the
+ // next byte -n+1 times. Else if n is 128, noop.
+ // Endloop
+
+ // The RLE-compressed data is preceded by a 2-byte data count for each
+ // row in the data, which we're going to just skip.
+ stbi__skip(s, h * channelCount * 2);
+
+ // Read the RLE data by channel.
+ for (channel = 0; channel < 4; channel++) {+ stbi_uc* p;
+
+ p = out + channel;
+ if (channel >= channelCount) {+ // Fill this channel with default data.
+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = (channel == 3 ? 255 : 0);
+ } else {+ // Read the RLE data.
+ if (!stbi__psd_decode_rle(s, p, pixelCount)) {+ STBI_FREE(out);
+ return stbi__errpuc("corrupt", "bad RLE data");+ }
+ }
+ }
+
+ } else {+ // We're at the raw image data. It's each channel in order (Red, Green,
+ // Blue, Alpha, ...) where each channel consists of an 8-bit (or 16-bit)
+ // value for each pixel in the image.
+
+ // Read the data by channel.
+ for (channel = 0; channel < 4; channel++) {+ if (channel >= channelCount) {+ // Fill this channel with default data.
+ if (bitdepth == 16 && bpc == 16) {+ stbi__uint16* q = ((stbi__uint16*)out) + channel;
+ stbi__uint16 val = channel == 3 ? 65535 : 0;
+ for (i = 0; i < pixelCount; i++, q += 4)
+ *q = val;
+ } else {+ stbi_uc* p = out + channel;
+ stbi_uc val = channel == 3 ? 255 : 0;
+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = val;
+ }
+ } else {+ if (ri->bits_per_channel == 16) { // output bpc+ stbi__uint16* q = ((stbi__uint16*)out) + channel;
+ for (i = 0; i < pixelCount; i++, q += 4)
+ *q = (stbi__uint16)stbi__get16be(s);
+ } else {+ stbi_uc* p = out + channel;
+ if (bitdepth == 16) { // input bpc+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = (stbi_uc)(stbi__get16be(s) >> 8);
+ } else {+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = stbi__get8(s);
+ }
+ }
+ }
+ }
+ }
+
+ // remove weird white matte from PSD
+ if (channelCount >= 4) {+ if (ri->bits_per_channel == 16) {+ for (i = 0; i < w * h; ++i) {+ stbi__uint16* pixel = (stbi__uint16*)out + 4 * i;
+ if (pixel[3] != 0 && pixel[3] != 65535) {+ float a = pixel[3] / 65535.0f;
+ float ra = 1.0f / a;
+ float inv_a = 65535.0f * (1 - ra);
+ pixel[0] = (stbi__uint16)(pixel[0] * ra + inv_a);
+ pixel[1] = (stbi__uint16)(pixel[1] * ra + inv_a);
+ pixel[2] = (stbi__uint16)(pixel[2] * ra + inv_a);
+ }
+ }
+ } else {+ for (i = 0; i < w * h; ++i) {+ unsigned char* pixel = out + 4 * i;
+ if (pixel[3] != 0 && pixel[3] != 255) {+ float a = pixel[3] / 255.0f;
+ float ra = 1.0f / a;
+ float inv_a = 255.0f * (1 - ra);
+ pixel[0] = (unsigned char)(pixel[0] * ra + inv_a);
+ pixel[1] = (unsigned char)(pixel[1] * ra + inv_a);
+ pixel[2] = (unsigned char)(pixel[2] * ra + inv_a);
+ }
+ }
+ }
+ }
+
+ // convert to desired output format
+ if (req_comp && req_comp != 4) {+ if (ri->bits_per_channel == 16)
+ out = (stbi_uc*)stbi__convert_format16((stbi__uint16*)out, 4, req_comp, w, h);
+ else
+ out = stbi__convert_format(out, 4, req_comp, w, h);
+ if (out == NULL)
+ return out; // stbi__convert_format frees input on failure
+ }
+
+ if (comp)
+ *comp = 4;
+ *y = h;
+ *x = w;
+
+ return out;
+}
+#endif
+
+// *************************************************************************************************
+// Softimage PIC loader
+// by Tom Seddon
+//
+// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
+// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_is4(stbi__context* s, const char* str) {+ int i;
+ for (i = 0; i < 4; ++i)
+ if (stbi__get8(s) != (stbi_uc)str[i])
+ return 0;
+
+ return 1;
+}
+
+static int stbi__pic_test_core(stbi__context* s) {+ int i;
+
+ if (!stbi__pic_is4(s, "\x53\x80\xF6\x34"))
+ return 0;
+
+ for (i = 0; i < 84; ++i)
+ stbi__get8(s);
+
+ if (!stbi__pic_is4(s, "PICT"))
+ return 0;
+
+ return 1;
+}
+
+typedef struct {+ stbi_uc size, type, channel;
+} stbi__pic_packet;
+
+static stbi_uc* stbi__readval(stbi__context* s, int channel, stbi_uc* dest) {+ int mask = 0x80, i;
+
+ for (i = 0; i < 4; ++i, mask >>= 1) {+ if (channel & mask) {+ if (stbi__at_eof(s))
+ return stbi__errpuc("bad file", "PIC file too short");+ dest[i] = stbi__get8(s);
+ }
+ }
+
+ return dest;
+}
+
+static void stbi__copyval(int channel, stbi_uc* dest, const stbi_uc* src) {+ int mask = 0x80, i;
+
+ for (i = 0; i < 4; ++i, mask >>= 1)
+ if (channel & mask)
+ dest[i] = src[i];
+}
+
+static stbi_uc* stbi__pic_load_core(stbi__context* s, int width, int height, int* comp, stbi_uc* result) {+ int act_comp = 0, num_packets = 0, y, chained;
+ stbi__pic_packet packets[10];
+
+ // this will (should...) cater for even some bizarre stuff like having data
+ // for the same channel in multiple packets.
+ do {+ stbi__pic_packet* packet;
+
+ if (num_packets == sizeof(packets) / sizeof(packets[0]))
+ return stbi__errpuc("bad format", "too many packets");+
+ packet = &packets[num_packets++];
+
+ chained = stbi__get8(s);
+ packet->size = stbi__get8(s);
+ packet->type = stbi__get8(s);
+ packet->channel = stbi__get8(s);
+
+ act_comp |= packet->channel;
+
+ if (stbi__at_eof(s))
+ return stbi__errpuc("bad file", "file too short (reading packets)");+ if (packet->size != 8)
+ return stbi__errpuc("bad format", "packet isn't 8bpp");+ } while (chained);
+
+ *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
+
+ for (y = 0; y < height; ++y) {+ int packet_idx;
+
+ for (packet_idx = 0; packet_idx < num_packets; ++packet_idx) {+ stbi__pic_packet* packet = &packets[packet_idx];
+ stbi_uc* dest = result + y * width * 4;
+
+ switch (packet->type) {+ default:
+ return stbi__errpuc("bad format", "packet has bad compression type");+
+ case 0: { // uncompressed+ int x;
+
+ for (x = 0; x < width; ++x, dest += 4)
+ if (!stbi__readval(s, packet->channel, dest))
+ return 0;
+ break;
+ }
+
+ case 1: // Pure RLE
+ {+ int left = width, i;
+
+ while (left > 0) {+ stbi_uc count, value[4];
+
+ count = stbi__get8(s);
+ if (stbi__at_eof(s))
+ return stbi__errpuc("bad file", "file too short (pure read count)");+
+ if (count > left)
+ count = (stbi_uc)left;
+
+ if (!stbi__readval(s, packet->channel, value))
+ return 0;
+
+ for (i = 0; i < count; ++i, dest += 4)
+ stbi__copyval(packet->channel, dest, value);
+ left -= count;
+ }
+ } break;
+
+ case 2: { // Mixed RLE+ int left = width;
+ while (left > 0) {+ int count = stbi__get8(s), i;
+ if (stbi__at_eof(s))
+ return stbi__errpuc("bad file", "file too short (mixed read count)");+
+ if (count >= 128) { // Repeated+ stbi_uc value[4];
+
+ if (count == 128)
+ count = stbi__get16be(s);
+ else
+ count -= 127;
+ if (count > left)
+ return stbi__errpuc("bad file", "scanline overrun");+
+ if (!stbi__readval(s, packet->channel, value))
+ return 0;
+
+ for (i = 0; i < count; ++i, dest += 4)
+ stbi__copyval(packet->channel, dest, value);
+ } else { // Raw+ ++count;
+ if (count > left)
+ return stbi__errpuc("bad file", "scanline overrun");+
+ for (i = 0; i < count; ++i, dest += 4)
+ if (!stbi__readval(s, packet->channel, dest))
+ return 0;
+ }
+ left -= count;
+ }
+ break;
+ }
+ }
+ }
+ }
+
+ return result;
+}
+
+static void* stbi__pic_load(stbi__context* s, int* px, int* py, int* comp, int req_comp, stbi__result_info* ri) {+ stbi_uc* result;
+ int i, x, y, internal_comp;
+ STBI_NOTUSED(ri);
+
+ if (!comp)
+ comp = &internal_comp;
+
+ for (i = 0; i < 92; ++i)
+ stbi__get8(s);
+
+ x = stbi__get16be(s);
+ y = stbi__get16be(s);
+ if (stbi__at_eof(s))
+ return stbi__errpuc("bad file", "file too short (pic header)");+ if (!stbi__mad3sizes_valid(x, y, 4, 0))
+ return stbi__errpuc("too large", "PIC image too large to decode");+
+ stbi__get32be(s); // skip `ratio'
+ stbi__get16be(s); // skip `fields'
+ stbi__get16be(s); // skip `pad'
+
+ // intermediate buffer is RGBA
+ result = (stbi_uc*)stbi__malloc_mad3(x, y, 4, 0);
+ memset(result, 0xff, x * y * 4);
+
+ if (!stbi__pic_load_core(s, x, y, comp, result)) {+ STBI_FREE(result);
+ result = 0;
+ }
+ *px = x;
+ *py = y;
+ if (req_comp == 0)
+ req_comp = *comp;
+ result = stbi__convert_format(result, 4, req_comp, x, y);
+
+ return result;
+}
+
+static int stbi__pic_test(stbi__context* s) {+ int r = stbi__pic_test_core(s);
+ stbi__rewind(s);
+ return r;
+}
+#endif
+
+// *************************************************************************************************
+// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
+
+#ifndef STBI_NO_GIF
+typedef struct {+ stbi__int16 prefix;
+ stbi_uc first;
+ stbi_uc suffix;
+} stbi__gif_lzw;
+
+typedef struct {+ int w, h;
+ stbi_uc* out; // output buffer (always 4 components)
+ stbi_uc* background; // The current "background" as far as a gif is concerned
+ stbi_uc* history;
+ int flags, bgindex, ratio, transparent, eflags;
+ stbi_uc pal[256][4];
+ stbi_uc lpal[256][4];
+ stbi__gif_lzw codes[8192];
+ stbi_uc* color_table;
+ int parse, step;
+ int lflags;
+ int start_x, start_y;
+ int max_x, max_y;
+ int cur_x, cur_y;
+ int line_size;
+ int delay;
+} stbi__gif;
+
+static int stbi__gif_test_raw(stbi__context* s) {+ int sz;
+ if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8')
+ return 0;
+ sz = stbi__get8(s);
+ if (sz != '9' && sz != '7')
+ return 0;
+ if (stbi__get8(s) != 'a')
+ return 0;
+ return 1;
+}
+
+static int stbi__gif_test(stbi__context* s) {+ int r = stbi__gif_test_raw(s);
+ stbi__rewind(s);
+ return r;
+}
+
+static void stbi__gif_parse_colortable(stbi__context* s, stbi_uc pal[256][4], int num_entries, int transp) {+ int i;
+ for (i = 0; i < num_entries; ++i) {+ pal[i][2] = stbi__get8(s);
+ pal[i][1] = stbi__get8(s);
+ pal[i][0] = stbi__get8(s);
+ pal[i][3] = transp == i ? 0 : 255;
+ }
+}
+
+static int stbi__gif_header(stbi__context* s, stbi__gif* g, int* comp, int is_info) {+ stbi_uc version;
+ if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8')
+ return stbi__err("not GIF", "Corrupt GIF");+
+ version = stbi__get8(s);
+ if (version != '7' && version != '9')
+ return stbi__err("not GIF", "Corrupt GIF");+ if (stbi__get8(s) != 'a')
+ return stbi__err("not GIF", "Corrupt GIF");+
+ stbi__g_failure_reason = "";
+ g->w = stbi__get16le(s);
+ g->h = stbi__get16le(s);
+ g->flags = stbi__get8(s);
+ g->bgindex = stbi__get8(s);
+ g->ratio = stbi__get8(s);
+ g->transparent = -1;
+
+ if (comp != 0)
+ *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the
+ // comments
+
+ if (is_info)
+ return 1;
+
+ if (g->flags & 0x80)
+ stbi__gif_parse_colortable(s, g->pal, 2 << (g->flags & 7), -1);
+
+ return 1;
+}
+
+static int stbi__gif_info_raw(stbi__context* s, int* x, int* y, int* comp) {+ stbi__gif* g = (stbi__gif*)stbi__malloc(sizeof(stbi__gif));
+ if (!stbi__gif_header(s, g, comp, 1)) {+ STBI_FREE(g);
+ stbi__rewind(s);
+ return 0;
+ }
+ if (x)
+ *x = g->w;
+ if (y)
+ *y = g->h;
+ STBI_FREE(g);
+ return 1;
+}
+
+static void stbi__out_gif_code(stbi__gif* g, stbi__uint16 code) {+ stbi_uc *p, *c;
+ int idx;
+
+ // recurse to decode the prefixes, since the linked-list is backwards,
+ // and working backwards through an interleaved image would be nasty
+ if (g->codes[code].prefix >= 0)
+ stbi__out_gif_code(g, g->codes[code].prefix);
+
+ if (g->cur_y >= g->max_y)
+ return;
+
+ idx = g->cur_x + g->cur_y;
+ p = &g->out[idx];
+ g->history[idx / 4] = 1;
+
+ c = &g->color_table[g->codes[code].suffix * 4];
+ if (c[3] > 128) { // don't render transparent pixels;+ p[0] = c[2];
+ p[1] = c[1];
+ p[2] = c[0];
+ p[3] = c[3];
+ }
+ g->cur_x += 4;
+
+ if (g->cur_x >= g->max_x) {+ g->cur_x = g->start_x;
+ g->cur_y += g->step;
+
+ while (g->cur_y >= g->max_y && g->parse > 0) {+ g->step = (1 << g->parse) * g->line_size;
+ g->cur_y = g->start_y + (g->step >> 1);
+ --g->parse;
+ }
+ }
+}
+
+static stbi_uc* stbi__process_gif_raster(stbi__context* s, stbi__gif* g) {+ stbi_uc lzw_cs;
+ stbi__int32 len, init_code;
+ stbi__uint32 first;
+ stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
+ stbi__gif_lzw* p;
+
+ lzw_cs = stbi__get8(s);
+ if (lzw_cs > 12)
+ return NULL;
+ clear = 1 << lzw_cs;
+ first = 1;
+ codesize = lzw_cs + 1;
+ codemask = (1 << codesize) - 1;
+ bits = 0;
+ valid_bits = 0;
+ for (init_code = 0; init_code < clear; init_code++) {+ g->codes[init_code].prefix = -1;
+ g->codes[init_code].first = (stbi_uc)init_code;
+ g->codes[init_code].suffix = (stbi_uc)init_code;
+ }
+
+ // support no starting clear code
+ avail = clear + 2;
+ oldcode = -1;
+
+ len = 0;
+ for (;;) {+ if (valid_bits < codesize) {+ if (len == 0) {+ len = stbi__get8(s); // start new block
+ if (len == 0)
+ return g->out;
+ }
+ --len;
+ bits |= (stbi__int32)stbi__get8(s) << valid_bits;
+ valid_bits += 8;
+ } else {+ stbi__int32 code = bits & codemask;
+ bits >>= codesize;
+ valid_bits -= codesize;
+ // @OPTIMIZE: is there some way we can accelerate the non-clear
+ // path?
+ if (code == clear) { // clear code+ codesize = lzw_cs + 1;
+ codemask = (1 << codesize) - 1;
+ avail = clear + 2;
+ oldcode = -1;
+ first = 0;
+ } else if (code == clear + 1) { // end of stream code+ stbi__skip(s, len);
+ while ((len = stbi__get8(s)) > 0)
+ stbi__skip(s, len);
+ return g->out;
+ } else if (code <= avail) {+ if (first) {+ return stbi__errpuc("no clear code", "Corrupt GIF");+ }
+
+ if (oldcode >= 0) {+ p = &g->codes[avail++];
+ if (avail > 8192) {+ return stbi__errpuc("too many codes", "Corrupt GIF");+ }
+
+ p->prefix = (stbi__int16)oldcode;
+ p->first = g->codes[oldcode].first;
+ p->suffix = (code == avail) ? p->first : g->codes[code].first;
+ } else if (code == avail)
+ return stbi__errpuc("illegal code in raster", "Corrupt GIF");+
+ stbi__out_gif_code(g, (stbi__uint16)code);
+
+ if ((avail & codemask) == 0 && avail <= 0x0FFF) {+ codesize++;
+ codemask = (1 << codesize) - 1;
+ }
+
+ oldcode = code;
+ } else {+ return stbi__errpuc("illegal code in raster", "Corrupt GIF");+ }
+ }
+ }
+}
+
+// this function is designed to support animated gifs, although stb_image
+// doesn't support it two back is the image from two frames ago, used for a very
+// specific disposal format
+static stbi_uc* stbi__gif_load_next(stbi__context* s, stbi__gif* g, int* comp, int req_comp, stbi_uc* two_back) {+ int dispose;
+ int first_frame;
+ int pi;
+ int pcount;
+ STBI_NOTUSED(req_comp);
+
+ // on first frame, any non-written pixels get the background colour
+ // (non-transparent)
+ first_frame = 0;
+ if (g->out == 0) {+ if (!stbi__gif_header(s, g, comp, 0))
+ return 0; // stbi__g_failure_reason set by stbi__gif_header
+ if (!stbi__mad3sizes_valid(4, g->w, g->h, 0))
+ return stbi__errpuc("too large", "GIF image is too large");+ pcount = g->w * g->h;
+ g->out = (stbi_uc*)stbi__malloc(4 * pcount);
+ g->background = (stbi_uc*)stbi__malloc(4 * pcount);
+ g->history = (stbi_uc*)stbi__malloc(pcount);
+ if (!g->out || !g->background || !g->history)
+ return stbi__errpuc("outofmem", "Out of memory");+
+ // image is treated as "transparent" at the start - ie, nothing
+ // overwrites the current background; background colour is only used for
+ // pixels that are not rendered first frame, after that "background"
+ // color refers to the color that was there the previous frame.
+ memset(g->out, 0x00, 4 * pcount);
+ memset(g->background, 0x00,
+ 4 * pcount); // state of the background (starts transparent)
+ memset(g->history, 0x00,
+ pcount); // pixels that were affected previous frame
+ first_frame = 1;
+ } else {+ // second frame - how do we dispoase of the previous one?
+ dispose = (g->eflags & 0x1C) >> 2;
+ pcount = g->w * g->h;
+
+ if ((dispose == 3) && (two_back == 0)) {+ dispose = 2; // if I don't have an image to revert back to, default
+ // to the old background
+ }
+
+ if (dispose == 3) { // use previous graphic+ for (pi = 0; pi < pcount; ++pi) {+ if (g->history[pi]) {+ memcpy(&g->out[pi * 4], &two_back[pi * 4], 4);
+ }
+ }
+ } else if (dispose == 2) {+ // restore what was changed last frame to background before that
+ // frame;
+ for (pi = 0; pi < pcount; ++pi) {+ if (g->history[pi]) {+ memcpy(&g->out[pi * 4], &g->background[pi * 4], 4);
+ }
+ }
+ } else {+ // This is a non-disposal case eithe way, so just
+ // leave the pixels as is, and they will become the new background
+ // 1: do not dispose
+ // 0: not specified.
+ }
+
+ // background is what out is after the undoing of the previou frame;
+ memcpy(g->background, g->out, 4 * g->w * g->h);
+ }
+
+ // clear my history;
+ memset(g->history, 0x00,
+ g->w * g->h); // pixels that were affected previous frame
+
+ for (;;) {+ int tag = stbi__get8(s);
+ switch (tag) {+ case 0x2C: /* Image Descriptor */
+ {+ stbi__int32 x, y, w, h;
+ stbi_uc* o;
+
+ x = stbi__get16le(s);
+ y = stbi__get16le(s);
+ w = stbi__get16le(s);
+ h = stbi__get16le(s);
+ if (((x + w) > (g->w)) || ((y + h) > (g->h)))
+ return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");+
+ g->line_size = g->w * 4;
+ g->start_x = x * 4;
+ g->start_y = y * g->line_size;
+ g->max_x = g->start_x + w * 4;
+ g->max_y = g->start_y + h * g->line_size;
+ g->cur_x = g->start_x;
+ g->cur_y = g->start_y;
+
+ // if the width of the specified rectangle is 0, that means
+ // we may not see *any* pixels or the image is malformed;
+ // to make sure this is caught, move the current y down to
+ // max_y (which is what out_gif_code checks).
+ if (w == 0)
+ g->cur_y = g->max_y;
+
+ g->lflags = stbi__get8(s);
+
+ if (g->lflags & 0x40) {+ g->step = 8 * g->line_size; // first interlaced spacing
+ g->parse = 3;
+ } else {+ g->step = g->line_size;
+ g->parse = 0;
+ }
+
+ if (g->lflags & 0x80) {+ stbi__gif_parse_colortable(s, g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1);
+ g->color_table = (stbi_uc*)g->lpal;
+ } else if (g->flags & 0x80) {+ g->color_table = (stbi_uc*)g->pal;
+ } else
+ return stbi__errpuc("missing color table", "Corrupt GIF");+
+ o = stbi__process_gif_raster(s, g);
+ if (!o)
+ return NULL;
+
+ // if this was the first frame,
+ pcount = g->w * g->h;
+ if (first_frame && (g->bgindex > 0)) {+ // if first frame, any pixel not drawn to gets the background
+ // color
+ for (pi = 0; pi < pcount; ++pi) {+ if (g->history[pi] == 0) {+ g->pal[g->bgindex][3] = 255; // just in case it was made transparent, undo
+ // that; It will be reset next frame if need
+ // be;
+ memcpy(&g->out[pi * 4], &g->pal[g->bgindex], 4);
+ }
+ }
+ }
+
+ return o;
+ }
+
+ case 0x21: // Comment Extension.
+ {+ int len;
+ int ext = stbi__get8(s);
+ if (ext == 0xF9) { // Graphic Control Extension.+ len = stbi__get8(s);
+ if (len == 4) {+ g->eflags = stbi__get8(s);
+ g->delay = 10 * stbi__get16le(s); // delay - 1/100th of a second,
+ // saving as 1/1000ths.
+
+ // unset old transparent
+ if (g->transparent >= 0) {+ g->pal[g->transparent][3] = 255;
+ }
+ if (g->eflags & 0x01) {+ g->transparent = stbi__get8(s);
+ if (g->transparent >= 0) {+ g->pal[g->transparent][3] = 0;
+ }
+ } else {+ // don't need transparent
+ stbi__skip(s, 1);
+ g->transparent = -1;
+ }
+ } else {+ stbi__skip(s, len);
+ break;
+ }
+ }
+ while ((len = stbi__get8(s)) != 0) {+ stbi__skip(s, len);
+ }
+ break;
+ }
+
+ case 0x3B: // gif stream termination code
+ return (stbi_uc*)s; // using '1' causes warning on some compilers
+
+ default:
+ return stbi__errpuc("unknown code", "Corrupt GIF");+ }
+ }
+}
+
+static void* stbi__load_gif_main(stbi__context* s, int** delays, int* x, int* y, int* z, int* comp, int req_comp) {+ if (stbi__gif_test(s)) {+ int layers = 0;
+ stbi_uc* u = 0;
+ stbi_uc* out = 0;
+ stbi_uc* two_back = 0;
+ stbi__gif g;
+ int stride;
+ memset(&g, 0, sizeof(g));
+ if (delays) {+ *delays = 0;
+ }
+
+ do {+ u = stbi__gif_load_next(s, &g, comp, req_comp, two_back);
+ if (u == (stbi_uc*)s)
+ u = 0; // end of animated gif marker
+
+ if (u) {+ *x = g.w;
+ *y = g.h;
+ ++layers;
+ stride = g.w * g.h * 4;
+
+ if (out) {+ void* tmp = (stbi_uc*)STBI_REALLOC(out, layers * stride);
+ if (NULL == tmp) {+ STBI_FREE(g.out);
+ STBI_FREE(g.history);
+ STBI_FREE(g.background);
+ return stbi__errpuc("outofmem", "Out of memory");+ } else
+ out = (stbi_uc*)tmp;
+ if (delays) {+ *delays = (int*)STBI_REALLOC(*delays, sizeof(int) * layers);
+ }
+ } else {+ out = (stbi_uc*)stbi__malloc(layers * stride);
+ if (delays) {+ *delays = (int*)stbi__malloc(layers * sizeof(int));
+ }
+ }
+ memcpy(out + ((layers - 1) * stride), u, stride);
+ if (layers >= 2) {+ two_back = out - 2 * stride;
+ }
+
+ if (delays) {+ (*delays)[layers - 1U] = g.delay;
+ }
+ }
+ } while (u != 0);
+
+ // free temp buffer;
+ STBI_FREE(g.out);
+ STBI_FREE(g.history);
+ STBI_FREE(g.background);
+
+ // do the final conversion after loading everything;
+ if (req_comp && req_comp != 4)
+ out = stbi__convert_format(out, 4, req_comp, layers * g.w, g.h);
+
+ *z = layers;
+ return out;
+ } else {+ return stbi__errpuc("not GIF", "Image was not as a gif type.");+ }
+}
+
+static void* stbi__gif_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri) {+ stbi_uc* u = 0;
+ stbi__gif g;
+ memset(&g, 0, sizeof(g));
+ STBI_NOTUSED(ri);
+
+ u = stbi__gif_load_next(s, &g, comp, req_comp, 0);
+ if (u == (stbi_uc*)s)
+ u = 0; // end of animated gif marker
+ if (u) {+ *x = g.w;
+ *y = g.h;
+
+ // moved conversion to after successful load so that the same
+ // can be done for multiple frames.
+ if (req_comp && req_comp != 4)
+ u = stbi__convert_format(u, 4, req_comp, g.w, g.h);
+ } else if (g.out) {+ // if there was an error and we allocated an image buffer, free it!
+ STBI_FREE(g.out);
+ }
+
+ // free buffers needed for multiple frame loading;
+ STBI_FREE(g.history);
+ STBI_FREE(g.background);
+
+ return u;
+}
+
+static int stbi__gif_info(stbi__context* s, int* x, int* y, int* comp) { return stbi__gif_info_raw(s, x, y, comp); }+#endif
+
+// *************************************************************************************************
+// Radiance RGBE HDR loader
+// originally by Nicolas Schulz
+#ifndef STBI_NO_HDR
+static int stbi__hdr_test_core(stbi__context* s, const char* signature) {+ int i;
+ for (i = 0; signature[i]; ++i)
+ if (stbi__get8(s) != signature[i])
+ return 0;
+ stbi__rewind(s);
+ return 1;
+}
+
+static int stbi__hdr_test(stbi__context* s) {+ int r = stbi__hdr_test_core(s, "#?RADIANCE\n");
+ stbi__rewind(s);
+ if (!r) {+ r = stbi__hdr_test_core(s, "#?RGBE\n");
+ stbi__rewind(s);
+ }
+ return r;
+}
+
+#define STBI__HDR_BUFLEN 1024
+static char* stbi__hdr_gettoken(stbi__context* z, char* buffer) {+ int len = 0;
+ char c = '\0';
+
+ c = (char)stbi__get8(z);
+
+ while (!stbi__at_eof(z) && c != '\n') {+ buffer[len++] = c;
+ if (len == STBI__HDR_BUFLEN - 1) {+ // flush to end of line
+ while (!stbi__at_eof(z) && stbi__get8(z) != '\n')
+ ;
+ break;
+ }
+ c = (char)stbi__get8(z);
+ }
+
+ buffer[len] = 0;
+ return buffer;
+}
+
+static void stbi__hdr_convert(float* output, stbi_uc* input, int req_comp) {+ if (input[3] != 0) {+ float f1;
+ // Exponent
+ f1 = (float)ldexp(1.0f, input[3] - (int)(128 + 8));
+ if (req_comp <= 2)
+ output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
+ else {+ output[0] = input[0] * f1;
+ output[1] = input[1] * f1;
+ output[2] = input[2] * f1;
+ }
+ if (req_comp == 2)
+ output[1] = 1;
+ if (req_comp == 4)
+ output[3] = 1;
+ } else {+ switch (req_comp) {+ case 4:
+ output[3] = 1; /* fallthrough */
+ case 3:
+ output[0] = output[1] = output[2] = 0;
+ break;
+ case 2:
+ output[1] = 1; /* fallthrough */
+ case 1:
+ output[0] = 0;
+ break;
+ }
+ }
+}
+
+static float* stbi__hdr_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri) {+ char buffer[STBI__HDR_BUFLEN];
+ char* token;
+ int valid = 0;
+ int width, height;
+ stbi_uc* scanline;
+ float* hdr_data;
+ int len;
+ unsigned char count, value;
+ int i, j, k, c1, c2, z;
+ const char* headerToken;
+ STBI_NOTUSED(ri);
+
+ // Check identifier
+ headerToken = stbi__hdr_gettoken(s, buffer);
+ if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0)
+ return stbi__errpf("not HDR", "Corrupt HDR image");+
+ // Parse header
+ for (;;) {+ token = stbi__hdr_gettoken(s, buffer);
+ if (token[0] == 0)
+ break;
+ if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0)
+ valid = 1;
+ }
+
+ if (!valid)
+ return stbi__errpf("unsupported format", "Unsupported HDR format");+
+ // Parse width and height
+ // can't use sscanf() if we're not using stdio!
+ token = stbi__hdr_gettoken(s, buffer);
+ if (strncmp(token, "-Y ", 3))
+ return stbi__errpf("unsupported data layout", "Unsupported HDR format");+ token += 3;
+ height = (int)strtol(token, &token, 10);
+ while (*token == ' ')
+ ++token;
+ if (strncmp(token, "+X ", 3))
+ return stbi__errpf("unsupported data layout", "Unsupported HDR format");+ token += 3;
+ width = (int)strtol(token, NULL, 10);
+
+ *x = width;
+ *y = height;
+
+ if (comp)
+ *comp = 3;
+ if (req_comp == 0)
+ req_comp = 3;
+
+ if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0))
+ return stbi__errpf("too large", "HDR image is too large");+
+ // Read data
+ hdr_data = (float*)stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0);
+ if (!hdr_data)
+ return stbi__errpf("outofmem", "Out of memory");+
+ // Load image data
+ // image data is stored as some number of sca
+ if (width < 8 || width >= 32768) {+ // Read flat data
+ for (j = 0; j < height; ++j) {+ for (i = 0; i < width; ++i) {+ stbi_uc rgbe[4];
+ main_decode_loop:
+ stbi__getn(s, rgbe, 4);
+ stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
+ }
+ }
+ } else {+ // Read RLE-encoded data
+ scanline = NULL;
+
+ for (j = 0; j < height; ++j) {+ c1 = stbi__get8(s);
+ c2 = stbi__get8(s);
+ len = stbi__get8(s);
+ if (c1 != 2 || c2 != 2 || (len & 0x80)) {+ // not run-length encoded, so we have to actually use THIS data
+ // as a decoded pixel (note this can't be a valid pixel--one of
+ // RGB must be
+ // >= 128)
+ stbi_uc rgbe[4];
+ rgbe[0] = (stbi_uc)c1;
+ rgbe[1] = (stbi_uc)c2;
+ rgbe[2] = (stbi_uc)len;
+ rgbe[3] = (stbi_uc)stbi__get8(s);
+ stbi__hdr_convert(hdr_data, rgbe, req_comp);
+ i = 1;
+ j = 0;
+ STBI_FREE(scanline);
+ goto main_decode_loop; // yes, this makes no sense
+ }
+ len <<= 8;
+ len |= stbi__get8(s);
+ if (len != width) {+ STBI_FREE(hdr_data);
+ STBI_FREE(scanline);
+ return stbi__errpf("invalid decoded scanline length", "corrupt HDR");+ }
+ if (scanline == NULL) {+ scanline = (stbi_uc*)stbi__malloc_mad2(width, 4, 0);
+ if (!scanline) {+ STBI_FREE(hdr_data);
+ return stbi__errpf("outofmem", "Out of memory");+ }
+ }
+
+ for (k = 0; k < 4; ++k) {+ int nleft;
+ i = 0;
+ while ((nleft = width - i) > 0) {+ count = stbi__get8(s);
+ if (count > 128) {+ // Run
+ value = stbi__get8(s);
+ count -= 128;
+ if (count > nleft) {+ STBI_FREE(hdr_data);
+ STBI_FREE(scanline);
+ return stbi__errpf("corrupt", "bad RLE data in HDR");+ }
+ for (z = 0; z < count; ++z)
+ scanline[i++ * 4 + k] = value;
+ } else {+ // Dump
+ if (count > nleft) {+ STBI_FREE(hdr_data);
+ STBI_FREE(scanline);
+ return stbi__errpf("corrupt", "bad RLE data in HDR");+ }
+ for (z = 0; z < count; ++z)
+ scanline[i++ * 4 + k] = stbi__get8(s);
+ }
+ }
+ }
+ for (i = 0; i < width; ++i)
+ stbi__hdr_convert(hdr_data + (j * width + i) * req_comp, scanline + i * 4, req_comp);
+ }
+ if (scanline)
+ STBI_FREE(scanline);
+ }
+
+ return hdr_data;
+}
+
+static int stbi__hdr_info(stbi__context* s, int* x, int* y, int* comp) {+ char buffer[STBI__HDR_BUFLEN];
+ char* token;
+ int valid = 0;
+ int dummy;
+
+ if (!x)
+ x = &dummy;
+ if (!y)
+ y = &dummy;
+ if (!comp)
+ comp = &dummy;
+
+ if (stbi__hdr_test(s) == 0) {+ stbi__rewind(s);
+ return 0;
+ }
+
+ for (;;) {+ token = stbi__hdr_gettoken(s, buffer);
+ if (token[0] == 0)
+ break;
+ if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0)
+ valid = 1;
+ }
+
+ if (!valid) {+ stbi__rewind(s);
+ return 0;
+ }
+ token = stbi__hdr_gettoken(s, buffer);
+ if (strncmp(token, "-Y ", 3)) {+ stbi__rewind(s);
+ return 0;
+ }
+ token += 3;
+ *y = (int)strtol(token, &token, 10);
+ while (*token == ' ')
+ ++token;
+ if (strncmp(token, "+X ", 3)) {+ stbi__rewind(s);
+ return 0;
+ }
+ token += 3;
+ *x = (int)strtol(token, NULL, 10);
+ *comp = 3;
+ return 1;
+}
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_info(stbi__context* s, int* x, int* y, int* comp) {+ void* p;
+ stbi__bmp_data info;
+
+ info.all_a = 255;
+ p = stbi__bmp_parse_header(s, &info);
+ stbi__rewind(s);
+ if (p == NULL)
+ return 0;
+ if (x)
+ *x = s->img_x;
+ if (y)
+ *y = s->img_y;
+ if (comp) {+ if (info.bpp == 24 && info.ma == 0xff000000)
+ *comp = 3;
+ else
+ *comp = info.ma ? 4 : 3;
+ }
+ return 1;
+}
+#endif
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_info(stbi__context* s, int* x, int* y, int* comp) {+ int channelCount, dummy, depth;
+ if (!x)
+ x = &dummy;
+ if (!y)
+ y = &dummy;
+ if (!comp)
+ comp = &dummy;
+ if (stbi__get32be(s) != 0x38425053) {+ stbi__rewind(s);
+ return 0;
+ }
+ if (stbi__get16be(s) != 1) {+ stbi__rewind(s);
+ return 0;
+ }
+ stbi__skip(s, 6);
+ channelCount = stbi__get16be(s);
+ if (channelCount < 0 || channelCount > 16) {+ stbi__rewind(s);
+ return 0;
+ }
+ *y = stbi__get32be(s);
+ *x = stbi__get32be(s);
+ depth = stbi__get16be(s);
+ if (depth != 8 && depth != 16) {+ stbi__rewind(s);
+ return 0;
+ }
+ if (stbi__get16be(s) != 3) {+ stbi__rewind(s);
+ return 0;
+ }
+ *comp = 4;
+ return 1;
+}
+
+static int stbi__psd_is16(stbi__context* s) {+ int channelCount, depth;
+ if (stbi__get32be(s) != 0x38425053) {+ stbi__rewind(s);
+ return 0;
+ }
+ if (stbi__get16be(s) != 1) {+ stbi__rewind(s);
+ return 0;
+ }
+ stbi__skip(s, 6);
+ channelCount = stbi__get16be(s);
+ if (channelCount < 0 || channelCount > 16) {+ stbi__rewind(s);
+ return 0;
+ }
+ (void)stbi__get32be(s);
+ (void)stbi__get32be(s);
+ depth = stbi__get16be(s);
+ if (depth != 16) {+ stbi__rewind(s);
+ return 0;
+ }
+ return 1;
+}
+#endif
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_info(stbi__context* s, int* x, int* y, int* comp) {+ int act_comp = 0, num_packets = 0, chained, dummy;
+ stbi__pic_packet packets[10];
+
+ if (!x)
+ x = &dummy;
+ if (!y)
+ y = &dummy;
+ if (!comp)
+ comp = &dummy;
+
+ if (!stbi__pic_is4(s, "\x53\x80\xF6\x34")) {+ stbi__rewind(s);
+ return 0;
+ }
+
+ stbi__skip(s, 88);
+
+ *x = stbi__get16be(s);
+ *y = stbi__get16be(s);
+ if (stbi__at_eof(s)) {+ stbi__rewind(s);
+ return 0;
+ }
+ if ((*x) != 0 && (1 << 28) / (*x) < (*y)) {+ stbi__rewind(s);
+ return 0;
+ }
+
+ stbi__skip(s, 8);
+
+ do {+ stbi__pic_packet* packet;
+
+ if (num_packets == sizeof(packets) / sizeof(packets[0]))
+ return 0;
+
+ packet = &packets[num_packets++];
+ chained = stbi__get8(s);
+ packet->size = stbi__get8(s);
+ packet->type = stbi__get8(s);
+ packet->channel = stbi__get8(s);
+ act_comp |= packet->channel;
+
+ if (stbi__at_eof(s)) {+ stbi__rewind(s);
+ return 0;
+ }
+ if (packet->size != 8) {+ stbi__rewind(s);
+ return 0;
+ }
+ } while (chained);
+
+ *comp = (act_comp & 0x10 ? 4 : 3);
+
+ return 1;
+}
+#endif
+
+// *************************************************************************************************
+// Portable Gray Map and Portable Pixel Map loader
+// by Ken Miller
+//
+// PGM: http://netpbm.sourceforge.net/doc/pgm.html
+// PPM: http://netpbm.sourceforge.net/doc/ppm.html
+//
+// Known limitations:
+// Does not support comments in the header section
+// Does not support ASCII image data (formats P2 and P3)
+// Does not support 16-bit-per-channel
+
+#ifndef STBI_NO_PNM
+
+static int stbi__pnm_test(stbi__context* s) {+ char p, t;
+ p = (char)stbi__get8(s);
+ t = (char)stbi__get8(s);
+ if (p != 'P' || (t != '5' && t != '6')) {+ stbi__rewind(s);
+ return 0;
+ }
+ return 1;
+}
+
+static void* stbi__pnm_load(stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri) {+ stbi_uc* out;
+ STBI_NOTUSED(ri);
+
+ if (!stbi__pnm_info(s, (int*)&s->img_x, (int*)&s->img_y, (int*)&s->img_n))
+ return 0;
+
+ *x = s->img_x;
+ *y = s->img_y;
+ if (comp)
+ *comp = s->img_n;
+
+ if (!stbi__mad3sizes_valid(s->img_n, s->img_x, s->img_y, 0))
+ return stbi__errpuc("too large", "PNM too large");+
+ out = (stbi_uc*)stbi__malloc_mad3(s->img_n, s->img_x, s->img_y, 0);
+ if (!out)
+ return stbi__errpuc("outofmem", "Out of memory");+ stbi__getn(s, out, s->img_n * s->img_x * s->img_y);
+
+ if (req_comp && req_comp != s->img_n) {+ out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
+ if (out == NULL)
+ return out; // stbi__convert_format frees input on failure
+ }
+ return out;
+}
+
+static int stbi__pnm_isspace(char c) { return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r'; }+
+static void stbi__pnm_skip_whitespace(stbi__context* s, char* c) {+ for (;;) {+ while (!stbi__at_eof(s) && stbi__pnm_isspace(*c))
+ *c = (char)stbi__get8(s);
+
+ if (stbi__at_eof(s) || *c != '#')
+ break;
+
+ while (!stbi__at_eof(s) && *c != '\n' && *c != '\r')
+ *c = (char)stbi__get8(s);
+ }
+}
+
+static int stbi__pnm_isdigit(char c) { return c >= '0' && c <= '9'; }+
+static int stbi__pnm_getinteger(stbi__context* s, char* c) {+ int value = 0;
+
+ while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {+ value = value * 10 + (*c - '0');
+ *c = (char)stbi__get8(s);
+ }
+
+ return value;
+}
+
+static int stbi__pnm_info(stbi__context* s, int* x, int* y, int* comp) {+ int maxv, dummy;
+ char c, p, t;
+
+ if (!x)
+ x = &dummy;
+ if (!y)
+ y = &dummy;
+ if (!comp)
+ comp = &dummy;
+
+ stbi__rewind(s);
+
+ // Get identifier
+ p = (char)stbi__get8(s);
+ t = (char)stbi__get8(s);
+ if (p != 'P' || (t != '5' && t != '6')) {+ stbi__rewind(s);
+ return 0;
+ }
+
+ *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm
+
+ c = (char)stbi__get8(s);
+ stbi__pnm_skip_whitespace(s, &c);
+
+ *x = stbi__pnm_getinteger(s, &c); // read width
+ stbi__pnm_skip_whitespace(s, &c);
+
+ *y = stbi__pnm_getinteger(s, &c); // read height
+ stbi__pnm_skip_whitespace(s, &c);
+
+ maxv = stbi__pnm_getinteger(s, &c); // read max value
+
+ if (maxv > 255)
+ return stbi__err("max value > 255", "PPM image not 8-bit");+ else
+ return 1;
+}
+#endif
+
+static int stbi__info_main(stbi__context* s, int* x, int* y, int* comp) {+#ifndef STBI_NO_JPEG
+ if (stbi__jpeg_info(s, x, y, comp))
+ return 1;
+#endif
+
+#ifndef STBI_NO_PNG
+ if (stbi__png_info(s, x, y, comp))
+ return 1;
+#endif
+
+#ifndef STBI_NO_GIF
+ if (stbi__gif_info(s, x, y, comp))
+ return 1;
+#endif
+
+#ifndef STBI_NO_BMP
+ if (stbi__bmp_info(s, x, y, comp))
+ return 1;
+#endif
+
+#ifndef STBI_NO_PSD
+ if (stbi__psd_info(s, x, y, comp))
+ return 1;
+#endif
+
+#ifndef STBI_NO_PIC
+ if (stbi__pic_info(s, x, y, comp))
+ return 1;
+#endif
+
+#ifndef STBI_NO_PNM
+ if (stbi__pnm_info(s, x, y, comp))
+ return 1;
+#endif
+
+#ifndef STBI_NO_HDR
+ if (stbi__hdr_info(s, x, y, comp))
+ return 1;
+#endif
+
+// test tga last because it's a crappy test!
+#ifndef STBI_NO_TGA
+ if (stbi__tga_info(s, x, y, comp))
+ return 1;
+#endif
+ return stbi__err("unknown image type", "Image not of any known type, or corrupt");+}
+
+static int stbi__is_16_main(stbi__context* s) {+#ifndef STBI_NO_PNG
+ if (stbi__png_is16(s))
+ return 1;
+#endif
+
+#ifndef STBI_NO_PSD
+ if (stbi__psd_is16(s))
+ return 1;
+#endif
+
+ return 0;
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_info(char const* filename, int* x, int* y, int* comp) {+ FILE* f = stbi__fopen(filename, "rb");
+ int result;
+ if (!f)
+ return stbi__err("can't fopen", "Unable to open file");+ result = stbi_info_from_file(f, x, y, comp);
+ fclose(f);
+ return result;
+}
+
+STBIDEF int stbi_info_from_file(FILE* f, int* x, int* y, int* comp) {+ int r;
+ stbi__context s;
+ long pos = ftell(f);
+ stbi__start_file(&s, f);
+ r = stbi__info_main(&s, x, y, comp);
+ fseek(f, pos, SEEK_SET);
+ return r;
+}
+
+STBIDEF int stbi_is_16_bit(char const* filename) {+ FILE* f = stbi__fopen(filename, "rb");
+ int result;
+ if (!f)
+ return stbi__err("can't fopen", "Unable to open file");+ result = stbi_is_16_bit_from_file(f);
+ fclose(f);
+ return result;
+}
+
+STBIDEF int stbi_is_16_bit_from_file(FILE* f) {+ int r;
+ stbi__context s;
+ long pos = ftell(f);
+ stbi__start_file(&s, f);
+ r = stbi__is_16_main(&s);
+ fseek(f, pos, SEEK_SET);
+ return r;
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int stbi_info_from_memory(stbi_uc const* buffer, int len, int* x, int* y, int* comp) {+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__info_main(&s, x, y, comp);
+}
+
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const* c, void* user, int* x, int* y, int* comp) {+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks*)c, user);
+ return stbi__info_main(&s, x, y, comp);
+}
+
+STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const* buffer, int len) {+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__is_16_main(&s);
+}
+
+STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const* c, void* user) {+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks*)c, user);
+ return stbi__is_16_main(&s);
+}
+
+#endif // STB_IMAGE_IMPLEMENTATION
+
+/*
+ revision history:
+ 2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and
+ platform ifdefs 2.19 (2018-02-11) fix warning 2.18 (2018-01-30) fix
+ warnings 2.17 (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug
+ 1-bit BMP
+ *_is_16_bit api
+ avoid warnings
+ 2.16 (2017-07-23) all functions have 16-bit variants;
+ STBI_NO_STDIO works again;
+ compilation fixes;
+ fix rounding in unpremultiply;
+ optimize vertical flip;
+ disable raw_len validation;
+ documentation fixes
+ 2.15 (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode;
+ warning fixes; disable run-time SSE detection on gcc;
+ uniform handling of optional "return" values;
+ thread-safe initialization of zlib tables
+ 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet
+ JPGs 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now 2.12
+ (2016-04-02) fix typo in 2.11 PSD fix that caused crashes 2.11 (2016-04-02)
+ allocate large structures on the stack remove white matting for transparent
+ PSD fix reported channel count for PNG & BMP re-enable SSE2 in non-gcc 64-bit
+ support RGB-formatted JPEG
+ read 16-bit PNGs (only as 8-bit)
+ 2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED
+ 2.09 (2016-01-16) allow comments in PNM files
+ 16-bit-per-pixel TGA (not bit-per-component)
+ info() for TGA could break due to .hdr handling
+ info() for BMP to shares code instead of sloppy parse
+ can use STBI_REALLOC_SIZED if allocator doesn't support
+ realloc code cleanup 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD
+ as RGBA 2.07 (2015-09-13) fix compiler warnings partial animated GIF support
+ limited 16-bpc PSD support
+ #ifdef unused functions
+ bug with < 92 byte PIC,PNM,HDR,TGA
+ 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value
+ 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning
+ 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit
+ 2.03 (2015-04-12) extra corruption checking (mmozeiko)
+ stbi_set_flip_vertically_on_load (nguillemot)
+ fix NEON support; fix mingw support
+ 2.02 (2015-01-19) fix incorrect assert, fix warning
+ 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit
+ without -msse2 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG 2.00
+ (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) progressive
+ JPEG (stb) PGM/PPM support (Ken Miller) STBI_MALLOC,STBI_REALLOC,STBI_FREE
+ GIF bugfix -- seemingly never worked
+ STBI_NO_*, STBI_ONLY_*
+ 1.48 (2014-12-14) fix incorrectly-named assert()
+ 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar
+ Cornut & stb) optimize PNG (ryg) fix bug in interlaced PNG with
+ user-specified channel count (stb) 1.46 (2014-08-26) fix broken tRNS chunk
+ (colorkey-style transparency) in non-paletted PNG 1.45 (2014-08-16) fix
+ MSVC-ARM internal compiler error by wrapping malloc 1.44 (2014-08-07)
+ various warning fixes from Ronny Chevalier
+ 1.43 (2014-07-15)
+ fix MSVC-only compiler problem in code changed in 1.42
+ 1.42 (2014-07-09)
+ don't define _CRT_SECURE_NO_WARNINGS (affects user code)
+ fixes to stbi__cleanup_jpeg path
+ added STBI_ASSERT to avoid requiring assert.h
+ 1.41 (2014-06-25)
+ fix search&replace from 1.36 that messed up comments/error
+ messages 1.40 (2014-06-22) fix gcc struct-initialization warning 1.39
+ (2014-06-15) fix to TGA optimization when req_comp != number of components in
+ TGA; fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my
+ test suite) add support for BMP version 5 (more ignored fields) 1.38
+ (2014-06-06) suppress MSVC warnings on integer casts truncating values fix
+ accidental rename of 'skip' field of I/O 1.37 (2014-06-04) remove duplicate
+ typedef 1.36 (2014-06-03) convert to header file single-file library if
+ de-iphone isn't set, load iphone images color-swapped instead of returning
+ NULL 1.35 (2014-05-27) various warnings fix broken STBI_SIMD path fix bug
+ where stbi_load_from_file no longer left file pointer in correct place fix
+ broken non-easy path for 32-bit BMP (possibly never used) TGA optimization by
+ Arseny Kapoulkine 1.34 (unknown) use STBI_NOTUSED in
+ stbi__resample_row_generic(), fix one more leak in tga failure case 1.33
+ (2011-07-14) make stbi_is_hdr work in STBI_NO_HDR (as specified), minor
+ compiler-friendly improvements 1.32 (2011-07-13) support for "info" function
+ for all supported filetypes (SpartanJ) 1.31 (2011-06-20) a few more leak
+ fixes, bug in PNG handling (SpartanJ) 1.30 (2011-06-11) added ability to
+ load files via callbacks to accomidate custom input streams (Ben Wenger)
+ removed deprecated format-specific test/load functions
+ removed support for installable file formats (stbi_loader) --
+ would have been broken for IO callbacks anyway error cases in bmp and tga
+ give messages and don't leak (Raymond Barbiero, grisha) fix inefficiency in
+ decoding 32-bit BMP (David Woo) 1.29 (2010-08-16) various warning fixes from
+ Aurelien Pocheville 1.28 (2010-08-01) fix bug in GIF palette transparency
+ (SpartanJ) 1.27 (2010-08-01) cast-to-stbi_uc to fix warnings 1.26
+ (2010-07-24) fix bug in file buffering for PNG reported by SpartanJ 1.25
+ (2010-07-17) refix trans_data warning (Won Chun) 1.24 (2010-07-12) perf
+ improvements reading from files on platforms with lock-heavy fgetc() minor
+ perf improvements for jpeg deprecated type-specific functions so we'll get
+ feedback if they're needed attempt to fix trans_data warning (Won Chun) 1.23
+ fixed bug in iPhone support 1.22 (2010-07-10) removed image *writing*
+ support stbi_info support from Jetro Lauha GIF support from Jean-Marc Lienher
+ iPhone PNG-extensions from James Brown
+ warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err.
+ Janez (U+017D)emva) 1.21 fix use of 'stbi_uc' in header (reported by jon
+ blow) 1.20 added support for Softimage PIC, by Tom Seddon 1.19 bug in
+ interlaced PNG corruption check (found by ryg) 1.18 (2008-08-02) fix a
+ threading bug (local mutable static) 1.17 support interlaced PNG 1.16
+ major bugfix - stbi__convert_format converted one too many pixels 1.15
+ initialize some fields for thread safety 1.14 fix threadsafe conversion
+ bug header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
+ 1.13 threadsafe
+ 1.12 const qualifiers in the API
+ 1.11 Support installable IDCT, colorspace conversion routines
+ 1.10 Fixes for 64-bit (don't use "unsigned long")
+ optimized upsampling by Fabian "ryg" Giesen
+ 1.09 Fix format-conversion for PSD code (bad global variables!)
+ 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz
+ 1.07 attempt to fix C++ warning/errors again
+ 1.06 attempt to fix C++ warning/errors again
+ 1.05 fix TGA loading to return correct *comp and use good luminance
+ calc 1.04 default float alpha is 1, not 255; use 'void *' for
+ stbi_image_free 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR 1.02 support
+ for (subset of) HDR files, float interface for preferred access to them 1.01
+ fix bug: possible bug in handling right-side up bmps... not sure fix bug: the
+ stbi__bmp_load() and stbi__tga_load() functions didn't work at all 1.00
+ interface to zlib that skips zlib header 0.99 correct handling of alpha in
+ palette 0.98 TGA loader by lonesock; dynamically add loaders (untested)
+ 0.97 jpeg errors on too large a file; also catch another malloc failure
+ 0.96 fix detection of invalid v value - particleman@mollyrocket forum
+ 0.95 during header scan, seek to markers in case of padding
+ 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same
+ 0.93 handle jpegtran output; verbose errors
+ 0.92 read 4,8,16,24,32-bit BMP files of several formats
+ 0.91 output 24-bit Windows 3.0 BMP files
+ 0.90 fix a few more warnings; bump version number to approach 1.0
+ 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd
+ 0.60 fix compiling as c++
+ 0.59 fix warnings: merge Dave Moore's -Wall fixes
+ 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian
+ 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but
+ less than 16 available 0.56 fix bug: zlib uncompressed mode len vs. nlen
+ 0.55 fix bug: restart_interval not initialized to 0
+ 0.54 allow NULL for 'int *comp'
+ 0.53 fix bug in png 3->4; speedup png decoding
+ 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments
+ 0.51 obey req_comp requests, 1-component jpegs return as 1-component,
+ on 'test' only check type, not whether we support this variant
+ 0.50 (2006-11-19)
+ first released version
+*/
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/
--- /dev/null
+++ b/src/include/tobjparse.h
@@ -1,0 +1,338 @@
+#ifndef TOBJ_PARSE_H
+#define TOBJ_PARSE_H
+#include "3dMath.h"
+#include "stretchy_buffer.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+typedef struct{+ long long unsigned int p;
+ long long unsigned int n;
+ long long unsigned int tc;
+ long long unsigned int vc;
+}facedef;
+typedef struct{+ vec3* positions;
+ vec3* normals;
+ vec3* texcoords;
+ vec3* colors;
+ facedef* faces;
+}objraw;
+typedef struct{+ int npoints; //Number of points.
+ vec3* d; //Triangles (Same winding as in the file)
+ vec3* n; //Normals
+ vec3* t; //Texture Cordinates
+ vec3* c; //colors
+}model;
+objraw initobjraw(){+ return (objraw){+ .positions=NULL,
+ .normals=NULL,
+ .texcoords=NULL,
+ .faces=NULL
+ };
+}
+model initmodel(){+ return (model){+ .npoints=0,
+ .d=NULL,
+ .n=NULL,
+ .t=NULL,
+ .c=NULL
+ };
+}
+void freeobjraw(objraw* o){+ sb_free(o->positions);
+ sb_free(o->texcoords);
+ sb_free(o->normals);
+ sb_free(o->colors);
+ sb_free(o->faces);
+}
+void freemodel(model* o){+ free(o->d);
+ free(o->t);
+ free(o->n);
+ free(o->c);
+}
+model tobj_tomodel(objraw* raw){+ if(!raw || raw->faces == NULL)
+ {+ puts("\nAttempted to convert empty model... Aborting...\n");+ return initmodel();
+ }
+ model ret = initmodel();
+ ret.npoints = 0;
+ ret.d=malloc(sizeof(vec3) * sb_count(raw->faces));
+ if(raw->normals)ret.n=malloc(sizeof(vec3) * sb_count(raw->faces));
+ if(raw->texcoords)ret.t=malloc(sizeof(vec3) * sb_count(raw->faces));
+ if(raw->colors)ret.c=malloc(sizeof(vec3) * sb_count(raw->faces));
+ long long unsigned int piter = 0;
+ long long unsigned int niter = 0;
+ long long unsigned int titer = 0;
+ long long unsigned int citer = 0;
+ //printf("\nsb_count of faces is %d",sb_count(raw->faces));+ for(long long int i = 0; i < sb_count(raw->faces);i++){+ //printf("\n::%lld:: 0\n",i);+ long long unsigned int p = raw->faces[i].p-1;
+ long long unsigned int n = raw->faces[i].n-1;
+ long long unsigned int t = raw->faces[i].tc-1;
+ long long unsigned int c = raw->faces[i].vc-1;
+
+ if(p < (long long unsigned int)sb_count(raw->positions)){+ //sb_push(ret.d, raw->positions[p]);
+ ret.d[piter++] = raw->positions[p];
+ ret.npoints++;
+ } else {+ printf("\nBad Data!!!\n");+ printf("p=%llu n=%llu t=%llu c=%llu i=%lld\n\n",p,n,t,c,i);+ }
+ if(raw->normals){+ if(n < (long long unsigned int)sb_count(raw->normals)){+ //sb_push(ret.n, raw->normals[n]);
+ ret.n[niter++] = raw->normals[n];
+ } else {+ puts("\n<BAD DATA>, NORMALS\n");+ }
+ }
+ if(raw->texcoords){+ if(t < (long long unsigned int)sb_count(raw->texcoords)){+ //sb_push(ret.t, raw->texcoords[t]);
+ ret.t[titer++] = raw->texcoords[t];
+ } else
+ puts("\n<BAD DATA>, TEXCOORDS\n");+ }
+ if(raw->colors){+ if(c < (long long unsigned int)sb_count(raw->colors)){+ //sb_push(ret.c, raw->colors[c]);
+ ret.c[citer++] = raw->colors[c];
+ } else {+ puts("\n<BAD DATA>, COLORS\n");+ }
+ }
+ }
+ //printf("\ntobj_tomodel completed.\n");+ if(ret.npoints != piter){+ printf("\nBAD DATA!!! ABORTING...\n");+ exit(1);
+ }
+ return ret;
+}
+//Only loads
+objraw tobj_load(const char* fn){+ FILE* f;
+ f = fopen(fn, "r");
+ objraw retval = initobjraw();
+ if(f){+ char line[2048];line[2047]=0;
+ //int read = 0;
+
+
+ while(fgets(line, 2047, f)){+ vec3 val;
+ facedef frick0;
+ facedef frick1;
+ facedef frick2;
+ if(line[0] == 'v' && line[1] == ' ' && (strlen(line) > 4)){+ //read = sscanf(line,"v %f %f %f",&val.d[0],&val.d[1],&val.d[2]);
+ //printf("\nv Read: %d",read);+ sb_push(retval.positions, val);
+ char* t = line+2;
+ sb_last(retval.positions).d[0] = atof(t);
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ sb_last(retval.positions).d[1] = atof(t);
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ sb_last(retval.positions).d[2] = atof(t);
+ }
+ if(line[0] == 'v' && line[1] == 't' && (strlen(line) > 4)){+ //read = sscanf(line,"vt %f %f",&val.d[0],&val.d[1]);
+ sb_push(retval.texcoords, val);
+ char* t = line+3;
+ sb_last(retval.texcoords).d[0] = atof(t);
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ sb_last(retval.texcoords).d[1] = -atof(t);
+
+ }
+ if(line[0] == 'v' && line[1] == 'c' && (strlen(line) > 4)){+ //read=sscanf(line,"vc %f %f %f",&val.d[0],&val.d[1],&val.d[2]);
+ sb_push(retval.colors, val);
+ char* t = line+3;
+ sb_last(retval.colors).d[0] = atof(t);
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ sb_last(retval.colors).d[1] = atof(t);
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ sb_last(retval.colors).d[2] = atof(t);
+ //printf("\nvc Read: %d",read);+
+ }
+ if(line[0] == 'v' && line[1] =='n' && (strlen(line) > 4)){+ //read=sscanf(line,"vn %f %f %f",&val.d[0],&val.d[1],&val.d[2]);
+ //printf("\nn Read: %d",read);+ sb_push(retval.normals, val);
+ char* t = line+3;
+ sb_last(retval.normals).d[0] = atof(t);
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ sb_last(retval.normals).d[1] = atof(t);
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ sb_last(retval.normals).d[2] = atof(t);
+
+ /*
+ printf("\nreading from stretchy buffer, %f %f %f",+ retval.normals[sb_count(retval.normals)-1].d[0],
+ retval.normals[sb_count(retval.normals)-1].d[1],
+ retval.normals[sb_count(retval.normals)-1].d[2]
+ );
+ */
+ }
+ if(line[0] == 'f' && (strlen(line) > 4)){+ //The face lines are hard to parse.
+ //They could be p p p
+ // or p/vt p/vt p/vt
+ //or p//n p//n p//n
+ //or p/vt/n p/vt/n p/vt/n
+ //or p/vt/n/c p/vt/n/c p/vt/n/c
+ //or some other combination, as long as it has p it's valid
+ //Grab the position indices
+ {+ char* t = line+2;
+ frick0.p = strtoull(t,NULL,10);
+ //printf("\nf[0].p is %llu",frick0.p);+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ frick1.p = strtoull(t,NULL,10);
+ //printf("\nf[1].p is %llu",frick1.p);+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ frick2.p = strtoull(t,NULL,10);
+ //printf("\nf[2].p is %llu",frick2.p);+ }
+ //Grab the texture coordinates (First character after first slash!)
+ if(retval.texcoords){+ char* t = line+2;
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to first slash
+ t++;//next character
+ frick0.tc = strtoull(t,NULL,10);
+ //printf("\nf[0].tc is %llu",frick0.tc);+ //Jump to the next group of numbers
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ //first slash
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to next slash
+ t++;//next character
+ frick1.tc = strtoull(t,NULL,10);
+ //printf("\nf[1].tc is %llu",frick1.tc);+ //Jump to the next group of numbers
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ //first slash
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to next slash
+ t++;//next character
+ frick2.tc = strtoull(t,NULL,10);
+ //printf("\nf[2].tc is %llu",frick2.tc);+ }
+ if(retval.normals){+ char* t = line+2;
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to first slash
+ t++;//next character
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to second slash
+ t++;//next character
+ frick0.n = strtoull(t,NULL,10);
+ //Jump to the next group of numbers
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ //first slash
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to first slash
+ t++;//next character
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to second slash
+ t++;//next character
+ frick1.n = strtoull(t,NULL,10);
+
+ //Jump to the next group of numbers
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ //first slash
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to first slash
+ t++;//next character
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to second slash
+ t++;//next character
+ frick2.n = strtoull(t,NULL,10);
+ }
+ if(retval.colors){+ char* t = line+2;
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to first slash
+ t++;//next character
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to second slash
+ t++;//next character
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to third slash
+ t++;//next character
+ frick0.vc = strtoull(t,NULL,10);
+ //printf("\nf[0].vc is %llu",frick0.vc);+ //Jump to the next group of numbers
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ //first slash
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to first slash
+ t++;//next character
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to second slash
+ t++;//next character
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to third slash
+ t++;//next character
+ frick1.vc = strtoull(t,NULL,10);
+ //printf("\nf[1].vc is %llu",frick1.vc);+ //Jump to the next group of numbers
+ while(!isspace(*t) && *t != '\0')t++;
+ if(*t == '\0')continue;
+ t++;
+ //first slash
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to first slash
+ t++;//next character
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to second slash
+ t++;//next character
+ while(!isspace(*t) && *t != '\0' && *t != '/')t++; //jump to third slash
+ t++;//next character
+ frick2.vc = strtoull(t,NULL,10);
+ //printf("\nf[2].vc is %llu",frick2.vc);+ }
+ sb_push(retval.faces,frick0);
+ sb_push(retval.faces,frick1);
+ sb_push(retval.faces,frick2);
+ /*
+ printf("\nReading from sb, frick0.p=%llu frick0.n=%llu frick0.tc=%llu frick0.vc=%llu",+ retval.faces[sb_count(retval.faces)-3].p,
+ retval.faces[sb_count(retval.faces)-3].n,
+ retval.faces[sb_count(retval.faces)-3].tc,
+ retval.faces[sb_count(retval.faces)-3].vc
+ );*/
+ }
+ }
+ fclose(f);
+ } else {+ printf("\nUnable to load file %s\n",fn);+ }
+
+ return retval;
+}
+
+#endif
\ No newline at end of file