source-engine/thirdparty/stb/tests/image_test.c

#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

#define STB_DEFINE
#include "stb.h"

//#define PNGSUITE_PRIMARY

#if 0
void test_ycbcr(void)
{
   STBI_SIMD_ALIGN(unsigned char, y[256]);
   STBI_SIMD_ALIGN(unsigned char, cb[256]);
   STBI_SIMD_ALIGN(unsigned char, cr[256]);
   STBI_SIMD_ALIGN(unsigned char, out1[256][4]);
   STBI_SIMD_ALIGN(unsigned char, out2[256][4]);

   int i,j,k;
   int count = 0, bigcount=0, total=0;

   for (i=0; i < 256; ++i) {
      for (j=0; j < 256; ++j) {
         for (k=0; k < 256; ++k) {
            y [k] = k;
            cb[k] = j;
            cr[k] = i;
         }
         stbi__YCbCr_to_RGB_row(out1[0], y, cb, cr, 256, 4);
         stbi__YCbCr_to_RGB_sse2(out2[0], y, cb, cr, 256, 4);
         for (k=0; k < 256; ++k) {
            // inaccurate proxy for values outside of RGB cube
            if (out1[k][0] == 0 || out1[k][1] == 0 || out1[k][2] == 0 || out1[k][0] == 255 || out1[k][1] == 255 || out1[k][2] == 255)
               continue;
            ++total;
            if (out1[k][0] != out2[k][0] || out1[k][1] != out2[k][1] || out1[k][2] != out2[k][2]) {
               int dist1 = abs(out1[k][0] - out2[k][0]);
               int dist2 = abs(out1[k][1] - out2[k][1]);
               int dist3 = abs(out1[k][2] - out2[k][2]);
               ++count;
               if (out1[k][1] > out2[k][1])
                  ++bigcount;
            }
         }
      }
      printf("So far: %d (%d big) of %d\n", count, bigcount, total);
   }
   printf("Final: %d (%d big) of %d\n", count, bigcount, total);
}
#endif

float hdr_data[200][200][3];

void dummy_write(void *context, void *data, int len)
{
   static char dummy[1024];
   if (len > 1024) len = 1024;
   memcpy(dummy, data, len);
}

int main(int argc, char **argv)
{
   int w,h;
   //test_ycbcr();

   #if 0
   // test hdr asserts
   for (h=0; h < 100; h += 2)
      for (w=0; w < 200; ++w)
         hdr_data[h][w][0] = (float) rand(),
         hdr_data[h][w][1] = (float) rand(),
         hdr_data[h][w][2] = (float) rand();

   stbi_write_hdr("output/test.hdr", 200,200,3,hdr_data[0][0]);
   #endif

   if (argc > 1) {
      int i, n;

      for (i=1; i < argc; ++i) {
         int res;
         int w2,h2,n2;
         unsigned char *data;
         printf("%s\n", argv[i]);
         res = stbi_info(argv[1], &w2, &h2, &n2);
         data = stbi_load(argv[i], &w, &h, &n, 4); if (data) free(data); else printf("Failed &n\n");
         data = stbi_load(argv[i], &w, &h,  0, 1); if (data) free(data); else printf("Failed 1\n");
         data = stbi_load(argv[i], &w, &h,  0, 2); if (data) free(data); else printf("Failed 2\n");
         data = stbi_load(argv[i], &w, &h,  0, 3); if (data) free(data); else printf("Failed 3\n");
         data = stbi_load(argv[i], &w, &h, &n, 4);
         assert(data);
         assert(w == w2 && h == h2 && n == n2);
         assert(res);
         if (data) {
            char fname[512];
            stb_splitpath(fname, argv[i], STB_FILE);
            stbi_write_png(stb_sprintf("output/%s.png", fname), w, h, 4, data, w*4);
            stbi_write_bmp(stb_sprintf("output/%s.bmp", fname), w, h, 4, data);
            stbi_write_tga(stb_sprintf("output/%s.tga", fname), w, h, 4, data);
            stbi_write_png_to_func(dummy_write,0, w, h, 4, data, w*4);
            stbi_write_bmp_to_func(dummy_write,0, w, h, 4, data);
            stbi_write_tga_to_func(dummy_write,0, w, h, 4, data);
            free(data);
         } else
            printf("FAILED 4\n");
      }
   } else {
      int i, nope=0;
      #ifdef PNGSUITE_PRIMARY
      char **files = stb_readdir_files("pngsuite/primary");
      #else
      char **files = stb_readdir_files("images");
      #endif
      for (i=0; i < stb_arr_len(files); ++i) {
         int n;
         char **failed = NULL;
         unsigned char *data;
         printf(".");
         //printf("%s\n", files[i]);
         data = stbi_load(files[i], &w, &h, &n, 0); if (data) free(data); else stb_arr_push(failed, "&n");
         data = stbi_load(files[i], &w, &h,  0, 1); if (data) free(data); else stb_arr_push(failed, "1");
         data = stbi_load(files[i], &w, &h,  0, 2); if (data) free(data); else stb_arr_push(failed, "2");
         data = stbi_load(files[i], &w, &h,  0, 3); if (data) free(data); else stb_arr_push(failed, "3");
         data = stbi_load(files[i], &w, &h,  0, 4); if (data)           ; else stb_arr_push(failed, "4");
         if (data) {
            char fname[512];

            #ifdef PNGSUITE_PRIMARY
            int w2,h2;
            unsigned char *data2;
            stb_splitpath(fname, files[i], STB_FILE_EXT);
            data2 = stbi_load(stb_sprintf("pngsuite/primary_check/%s", fname), &w2, &h2, 0, 4);
            if (!data2)
               printf("FAILED: couldn't load 'pngsuite/primary_check/%s\n", fname);
            else {
               if (w != w2 || h != w2 || 0 != memcmp(data, data2, w*h*4)) {
                  int x,y,c;
                  if (w == w2 && h == h2)
                     for (y=0; y < h; ++y)
                        for (x=0; x < w; ++x)
                           for (c=0; c < 4; ++c)
                              assert(data[y*w*4+x*4+c] == data2[y*w*4+x*4+c]);
                  printf("FAILED: %s loaded but didn't match PRIMARY_check 32-bit version\n", files[i]);
               }
               free(data2);
            }
            #else
            stb_splitpath(fname, files[i], STB_FILE);
            stbi_write_png(stb_sprintf("output/%s.png", fname), w, h, 4, data, w*4);
            #endif
            free(data);
         }
         if (failed) {
            int j;
            printf("FAILED: ");
            for (j=0; j < stb_arr_len(failed); ++j)
               printf("%s ", failed[j]);
            printf(" -- %s\n", files[i]);
         }
      }
      printf("Tested %d files.\n", i);
   }
   return 0;
}