ref: f7e5af47f117be34669dc1e532d525dcbbff73f0
dir: /jp2.c/
#include <jasper/jasper.h> #include <draw.h> #include <memdraw.h> static void usage(void) { fprint(2, "usage: %s\n", argv0); exits("usage"); } void main(int argc, char **argv) { jas_stream_t *s; jas_image_t *im; jas_cmprof_t *cp; int c, i, w, h, x, y; jas_image_cmpttype_t comps[] = { JAS_IMAGE_CT_RGB_R, JAS_IMAGE_CT_RGB_G, JAS_IMAGE_CT_RGB_B, }; u8int *rgb; long *b; Memimage *m; ARGBEGIN{ default: usage(); }ARGEND if(argc != 0) usage(); memimageinit(); jas_conf_clear(); jas_conf_set_max_mem_usage(512*1024*1024); jas_init_library(); jas_init_thread(); if((cp = jas_cmprof_createfromclrspc(JAS_CLRSPC_SRGB)) == nil){ werrstr("failed to create color space"); goto error; } if((s = jas_stream_fdopen(0, "rb")) == nil){ werrstr("failed to open"); goto error; } if((im = jas_image_decode(s, -1, "")) == nil){ werrstr("failed to decode: %r"); goto error; } jas_stream_close(s); if(jas_clrspc_isunknown(im->clrspc_)){ werrstr("unknown color space"); goto error; } if((im = jas_image_chclrspc(im, cp, JAS_CMXFORM_INTENT_PER)) == nil){ werrstr("failed to change color space"); goto error; } w = jas_image_width(im); h = jas_image_height(im); if((b = malloc(w*h*sizeof(*b))) == nil){ werrstr("memory"); goto error; } if((rgb = malloc(w*h*3)) == nil){ werrstr("memory"); goto error; } for(i = 0; i < nelem(comps); i++){ if((c = jas_image_getcmptbytype(im, comps[i])) < 0){ werrstr("failed to get component R"); goto error; } if(jas_image_readcmpt2(im, c, 0, 0, w, h, b) < 0){ werrstr("read component failed"); goto error; } for(y = 0; y < h; y++){ for(x = 0; x < w; x++) rgb[3*(y*w + x) + 2-i] = b[y*w + x]; } } jas_image_destroy(im); free(b); if((m = allocmemimage(Rect(0,0,w,h), RGB24)) == nil){ werrstr("memory"); goto error; } loadmemimage(m, m->r, rgb, w*h*3); writememimage(1, m); freememimage(m); exits(nil); error: fprint(2, "%r\n"); exits("error"); }