ref: bea7b7bf8ccbc2bc41906517079e76fcfb31cb5a
dir: /code/renderer/tr_font.c/
/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
// tr_font.c
//
//
// The font system uses FreeType 2.x to render TrueType fonts for use within the game.
// As of this writing ( Nov, 2000 ) Team Arena uses these fonts for all of the ui and
// about 90% of the cgame presentation. A few areas of the CGAME were left uses the old
// fonts since the code is shared with standard Q3A.
//
// If you include this font rendering code in a commercial product you MUST include the
// following somewhere with your product, see www.freetype.org for specifics or changes.
// The Freetype code also uses some hinting techniques that MIGHT infringe on patents
// held by apple so be aware of that also.
//
// As of Q3A 1.25+ and Team Arena, we are shipping the game with the font rendering code
// disabled. This removes any potential patent issues and it keeps us from having to
// distribute an actual TrueTrype font which is 1. expensive to do and 2. seems to require
// an act of god to accomplish.
//
// What we did was pre-render the fonts using FreeType ( which is why we leave the FreeType
// credit in the credits ) and then saved off the glyph data and then hand touched up the
// font bitmaps so they scale a bit better in GL.
//
// There are limitations in the way fonts are saved and reloaded in that it is based on
// point size and not name. So if you pre-render Helvetica in 18 point and Impact in 18 point
// you will end up with a single 18 point data file and image set. Typically you will want to
// choose 3 sizes to best approximate the scaling you will be doing in the ui scripting system
//
// In the UI Scripting code, a scale of 1.0 is equal to a 48 point font. In Team Arena, we
// use three or four scales, most of them exactly equaling the specific rendered size. We
// rendered three sizes in Team Arena, 12, 16, and 20.
//
// To generate new font data you need to go through the following steps.
// 1. delete the fontImage_x_xx.tga files and fontImage_xx.dat files from the fonts path.
// 2. in a ui script, specificy a font, smallFont, and bigFont keyword with font name and
// point size. the original TrueType fonts must exist in fonts at this point.
// 3. run the game, you should see things normally.
// 4. Exit the game and there will be three dat files and at least three tga files. The
// tga's are in 256x256 pages so if it takes three images to render a 24 point font you
// will end up with fontImage_0_24.tga through fontImage_2_24.tga
// 5. You will need to flip the tga's in Photoshop as the tga output code writes them upside
// down.
// 6. In future runs of the game, the system looks for these images and data files when a s
// specific point sized font is rendered and loads them for use.
// 7. Because of the original beta nature of the FreeType code you will probably want to hand
// touch the font bitmaps.
//
// Currently a define in the project turns on or off the FreeType code which is currently
// defined out. To pre-render new fonts you need enable the define ( BUILD_FREETYPE ) and
// uncheck the exclude from build check box in the FreeType2 area of the Renderer project.
#include "tr_local.h"
#include "../qcommon/qcommon.h"
#ifdef BUILD_FREETYPE
#include "../ft2/fterrors.h"
#include "../ft2/ftsystem.h"
#include "../ft2/ftimage.h"
#include "../ft2/freetype.h"
#include "../ft2/ftoutln.h"
#define _FLOOR(x) ((x) & -64)
#define _CEIL(x) (((x)+63) & -64)
#define _TRUNC(x) ((x) >> 6)
FT_Library ftLibrary = NULL;
#endif
#define MAX_FONTS 6
static int registeredFontCount = 0;
static fontInfo_t registeredFont[MAX_FONTS];
#ifdef BUILD_FREETYPE
void R_GetGlyphInfo(FT_GlyphSlot glyph, int *left, int *right, int *width, int *top, int *bottom, int *height, int *pitch) {
*left = _FLOOR( glyph->metrics.horiBearingX );
*right = _CEIL( glyph->metrics.horiBearingX + glyph->metrics.width );
*width = _TRUNC(*right - *left);
*top = _CEIL( glyph->metrics.horiBearingY );
*bottom = _FLOOR( glyph->metrics.horiBearingY - glyph->metrics.height );
*height = _TRUNC( *top - *bottom );
*pitch = ( qtrue ? (*width+3) & -4 : (*width+7) >> 3 );
}
FT_Bitmap *R_RenderGlyph(FT_GlyphSlot glyph, glyphInfo_t* glyphOut) {
FT_Bitmap *bit2;
int left, right, width, top, bottom, height, pitch, size;
R_GetGlyphInfo(glyph, &left, &right, &width, &top, &bottom, &height, &pitch);
if ( glyph->format == ft_glyph_format_outline ) {
size = pitch*height;
bit2 = Z_Malloc(sizeof(FT_Bitmap));
bit2->width = width;
bit2->rows = height;
bit2->pitch = pitch;
bit2->pixel_mode = ft_pixel_mode_grays;
//bit2->pixel_mode = ft_pixel_mode_mono;
bit2->buffer = Z_Malloc(pitch*height);
bit2->num_grays = 256;
Com_Memset( bit2->buffer, 0, size );
FT_Outline_Translate( &glyph->outline, -left, -bottom );
FT_Outline_Get_Bitmap( ftLibrary, &glyph->outline, bit2 );
glyphOut->height = height;
glyphOut->pitch = pitch;
glyphOut->top = (glyph->metrics.horiBearingY >> 6) + 1;
glyphOut->bottom = bottom;
return bit2;
}
else {
ri.Printf(PRINT_ALL, "Non-outline fonts are not supported\n");
}
return NULL;
}
void WriteTGA (char *filename, byte *data, int width, int height) {
byte *buffer;
int i, c;
buffer = Z_Malloc(width*height*4 + 18);
Com_Memset (buffer, 0, 18);
buffer[2] = 2; // uncompressed type
buffer[12] = width&255;
buffer[13] = width>>8;
buffer[14] = height&255;
buffer[15] = height>>8;
buffer[16] = 32; // pixel size
// swap rgb to bgr
c = 18 + width * height * 4;
for (i=18 ; i<c ; i+=4)
{
buffer[i] = data[i-18+2]; // blue
buffer[i+1] = data[i-18+1]; // green
buffer[i+2] = data[i-18+0]; // red
buffer[i+3] = data[i-18+3]; // alpha
}
ri.FS_WriteFile(filename, buffer, c);
//f = fopen (filename, "wb");
//fwrite (buffer, 1, c, f);
//fclose (f);
Z_Free (buffer);
}
static glyphInfo_t *RE_ConstructGlyphInfo(unsigned char *imageOut, int *xOut, int *yOut, int *maxHeight, FT_Face face, const unsigned char c, qboolean calcHeight) {
int i;
static glyphInfo_t glyph;
unsigned char *src, *dst;
float scaled_width, scaled_height;
FT_Bitmap *bitmap = NULL;
Com_Memset(&glyph, 0, sizeof(glyphInfo_t));
// make sure everything is here
if (face != NULL) {
FT_Load_Glyph(face, FT_Get_Char_Index( face, c), FT_LOAD_DEFAULT );
bitmap = R_RenderGlyph(face->glyph, &glyph);
if (bitmap) {
glyph.xSkip = (face->glyph->metrics.horiAdvance >> 6) + 1;
} else {
return &glyph;
}
if (glyph.height > *maxHeight) {
*maxHeight = glyph.height;
}
if (calcHeight) {
Z_Free(bitmap->buffer);
Z_Free(bitmap);
return &glyph;
}
/*
// need to convert to power of 2 sizes so we do not get
// any scaling from the gl upload
for (scaled_width = 1 ; scaled_width < glyph.pitch ; scaled_width<<=1)
;
for (scaled_height = 1 ; scaled_height < glyph.height ; scaled_height<<=1)
;
*/
scaled_width = glyph.pitch;
scaled_height = glyph.height;
// we need to make sure we fit
if (*xOut + scaled_width + 1 >= 255) {
if (*yOut + *maxHeight + 1 >= 255) {
*yOut = -1;
*xOut = -1;
Z_Free(bitmap->buffer);
Z_Free(bitmap);
return &glyph;
} else {
*xOut = 0;
*yOut += *maxHeight + 1;
}
} else if (*yOut + *maxHeight + 1 >= 255) {
*yOut = -1;
*xOut = -1;
Z_Free(bitmap->buffer);
Z_Free(bitmap);
return &glyph;
}
src = bitmap->buffer;
dst = imageOut + (*yOut * 256) + *xOut;
if (bitmap->pixel_mode == ft_pixel_mode_mono) {
for (i = 0; i < glyph.height; i++) {
int j;
unsigned char *_src = src;
unsigned char *_dst = dst;
unsigned char mask = 0x80;
unsigned char val = *_src;
for (j = 0; j < glyph.pitch; j++) {
if (mask == 0x80) {
val = *_src++;
}
if (val & mask) {
*_dst = 0xff;
}
mask >>= 1;
if ( mask == 0 ) {
mask = 0x80;
}
_dst++;
}
src += glyph.pitch;
dst += 256;
}
} else {
for (i = 0; i < glyph.height; i++) {
Com_Memcpy(dst, src, glyph.pitch);
src += glyph.pitch;
dst += 256;
}
}
// we now have an 8 bit per pixel grey scale bitmap
// that is width wide and pf->ftSize->metrics.y_ppem tall
glyph.imageHeight = scaled_height;
glyph.imageWidth = scaled_width;
glyph.s = (float)*xOut / 256;
glyph.t = (float)*yOut / 256;
glyph.s2 = glyph.s + (float)scaled_width / 256;
glyph.t2 = glyph.t + (float)scaled_height / 256;
*xOut += scaled_width + 1;
}
Z_Free(bitmap->buffer);
Z_Free(bitmap);
return &glyph;
}
#endif
static int fdOffset;
static byte *fdFile;
int readInt() {
int i = fdFile[fdOffset]+(fdFile[fdOffset+1]<<8)+(fdFile[fdOffset+2]<<16)+(fdFile[fdOffset+3]<<24);
fdOffset += 4;
return i;
}
typedef union {
byte fred[4];
float ffred;
} poor;
float readFloat() {
poor me;
#if idppc
me.fred[0] = fdFile[fdOffset+3];
me.fred[1] = fdFile[fdOffset+2];
me.fred[2] = fdFile[fdOffset+1];
me.fred[3] = fdFile[fdOffset+0];
#else
me.fred[0] = fdFile[fdOffset+0];
me.fred[1] = fdFile[fdOffset+1];
me.fred[2] = fdFile[fdOffset+2];
me.fred[3] = fdFile[fdOffset+3];
#endif
fdOffset += 4;
return me.ffred;
}
void RE_RegisterFont(const char *fontName, int pointSize, fontInfo_t *font) {
#ifdef BUILD_FREETYPE
FT_Face face;
int j, k, xOut, yOut, lastStart, imageNumber;
int scaledSize, newSize, maxHeight, left, satLevels;
unsigned char *out, *imageBuff;
glyphInfo_t *glyph;
image_t *image;
qhandle_t h;
float max;
#endif
void *faceData;
int i, len;
char name[1024];
float dpi = 72; //
float glyphScale = 72.0f / dpi; // change the scale to be relative to 1 based on 72 dpi ( so dpi of 144 means a scale of .5 )
if (pointSize <= 0) {
pointSize = 12;
}
// we also need to adjust the scale based on point size relative to 48 points as the ui scaling is based on a 48 point font
glyphScale *= 48.0f / pointSize;
// make sure the render thread is stopped
R_SyncRenderThread();
if (registeredFontCount >= MAX_FONTS) {
ri.Printf(PRINT_ALL, "RE_RegisterFont: Too many fonts registered already.\n");
return;
}
Com_sprintf(name, sizeof(name), "fonts/fontImage_%i.dat",pointSize);
for (i = 0; i < registeredFontCount; i++) {
if (Q_stricmp(name, registeredFont[i].name) == 0) {
Com_Memcpy(font, ®isteredFont[i], sizeof(fontInfo_t));
return;
}
}
len = ri.FS_ReadFile(name, NULL);
if (len == sizeof(fontInfo_t)) {
ri.FS_ReadFile(name, &faceData);
fdOffset = 0;
fdFile = faceData;
for(i=0; i<GLYPHS_PER_FONT; i++) {
font->glyphs[i].height = readInt();
font->glyphs[i].top = readInt();
font->glyphs[i].bottom = readInt();
font->glyphs[i].pitch = readInt();
font->glyphs[i].xSkip = readInt();
font->glyphs[i].imageWidth = readInt();
font->glyphs[i].imageHeight = readInt();
font->glyphs[i].s = readFloat();
font->glyphs[i].t = readFloat();
font->glyphs[i].s2 = readFloat();
font->glyphs[i].t2 = readFloat();
font->glyphs[i].glyph = readInt();
Com_Memcpy(font->glyphs[i].shaderName, &fdFile[fdOffset], 32);
fdOffset += 32;
}
font->glyphScale = readFloat();
Com_Memcpy(font->name, &fdFile[fdOffset], MAX_QPATH);
// Com_Memcpy(font, faceData, sizeof(fontInfo_t));
Q_strncpyz(font->name, name, sizeof(font->name));
for (i = GLYPH_START; i < GLYPH_END; i++) {
font->glyphs[i].glyph = RE_RegisterShaderNoMip(font->glyphs[i].shaderName);
}
Com_Memcpy(®isteredFont[registeredFontCount++], font, sizeof(fontInfo_t));
return;
}
#ifndef BUILD_FREETYPE
ri.Printf(PRINT_ALL, "RE_RegisterFont: FreeType code not available\n");
#else
if (ftLibrary == NULL) {
ri.Printf(PRINT_ALL, "RE_RegisterFont: FreeType not initialized.\n");
return;
}
len = ri.FS_ReadFile(fontName, &faceData);
if (len <= 0) {
ri.Printf(PRINT_ALL, "RE_RegisterFont: Unable to read font file\n");
return;
}
// allocate on the stack first in case we fail
if (FT_New_Memory_Face( ftLibrary, faceData, len, 0, &face )) {
ri.Printf(PRINT_ALL, "RE_RegisterFont: FreeType2, unable to allocate new face.\n");
return;
}
if (FT_Set_Char_Size( face, pointSize << 6, pointSize << 6, dpi, dpi)) {
ri.Printf(PRINT_ALL, "RE_RegisterFont: FreeType2, Unable to set face char size.\n");
return;
}
//*font = ®isteredFonts[registeredFontCount++];
// make a 256x256 image buffer, once it is full, register it, clean it and keep going
// until all glyphs are rendered
out = Z_Malloc(1024*1024);
if (out == NULL) {
ri.Printf(PRINT_ALL, "RE_RegisterFont: Z_Malloc failure during output image creation.\n");
return;
}
Com_Memset(out, 0, 1024*1024);
maxHeight = 0;
for (i = GLYPH_START; i < GLYPH_END; i++) {
glyph = RE_ConstructGlyphInfo(out, &xOut, &yOut, &maxHeight, face, (unsigned char)i, qtrue);
}
xOut = 0;
yOut = 0;
i = GLYPH_START;
lastStart = i;
imageNumber = 0;
while ( i <= GLYPH_END ) {
glyph = RE_ConstructGlyphInfo(out, &xOut, &yOut, &maxHeight, face, (unsigned char)i, qfalse);
if (xOut == -1 || yOut == -1 || i == GLYPH_END) {
// ran out of room
// we need to create an image from the bitmap, set all the handles in the glyphs to this point
//
scaledSize = 256*256;
newSize = scaledSize * 4;
imageBuff = Z_Malloc(newSize);
left = 0;
max = 0;
satLevels = 255;
for ( k = 0; k < (scaledSize) ; k++ ) {
if (max < out[k]) {
max = out[k];
}
}
if (max > 0) {
max = 255/max;
}
for ( k = 0; k < (scaledSize) ; k++ ) {
imageBuff[left++] = 255;
imageBuff[left++] = 255;
imageBuff[left++] = 255;
imageBuff[left++] = ((float)out[k] * max);
}
Com_sprintf (name, sizeof(name), "fonts/fontImage_%i_%i.tga", imageNumber++, pointSize);
if (r_saveFontData->integer) {
WriteTGA(name, imageBuff, 256, 256);
}
//Com_sprintf (name, sizeof(name), "fonts/fontImage_%i_%i", imageNumber++, pointSize);
image = R_CreateImage(name, imageBuff, 256, 256, qfalse, qfalse, GL_CLAMP);
h = RE_RegisterShaderFromImage(name, LIGHTMAP_2D, image, qfalse);
for (j = lastStart; j < i; j++) {
font->glyphs[j].glyph = h;
Q_strncpyz(font->glyphs[j].shaderName, name, sizeof(font->glyphs[j].shaderName));
}
lastStart = i;
Com_Memset(out, 0, 1024*1024);
xOut = 0;
yOut = 0;
Z_Free(imageBuff);
i++;
} else {
Com_Memcpy(&font->glyphs[i], glyph, sizeof(glyphInfo_t));
i++;
}
}
registeredFont[registeredFontCount].glyphScale = glyphScale;
font->glyphScale = glyphScale;
Com_Memcpy(®isteredFont[registeredFontCount++], font, sizeof(fontInfo_t));
if (r_saveFontData->integer) {
ri.FS_WriteFile(va("fonts/fontImage_%i.dat", pointSize), font, sizeof(fontInfo_t));
}
Z_Free(out);
ri.FS_FreeFile(faceData);
#endif
}
void R_InitFreeType() {
#ifdef BUILD_FREETYPE
if (FT_Init_FreeType( &ftLibrary )) {
ri.Printf(PRINT_ALL, "R_InitFreeType: Unable to initialize FreeType.\n");
}
#endif
registeredFontCount = 0;
}
void R_DoneFreeType() {
#ifdef BUILD_FREETYPE
if (ftLibrary) {
FT_Done_FreeType( ftLibrary );
ftLibrary = NULL;
}
#endif
registeredFontCount = 0;
}