img2bgra.c

 
#include <winpr/image.h>
#include <stdio.h>
 
static void usage(const char* name)
{
  (void)printf("%s <source file> <destination file>\n\n", name);
  (void)printf("\tRead any image format supported by WinPR::wImage\n");
  (void)printf("\tand convert it to raw BGRA data.\n\n");
  (void)printf("\toutput format is a C header with an array ready to be included\n");
}
 
static int dump_data_hex(FILE* fp, const uint8_t* data, size_t size)
{
  if (size > 0)
  {
    const int rc = fprintf(fp, "0x%02" PRIx8, data[0]);
    if (rc != 4)
      return -1;
  }
 
  for (size_t x = 1; x < size; x++)
  {
    if (x % 16 == 0)
    {
      const int rc = fprintf(fp, ",\n");
      if (rc != 2)
        return -2;
    }
    else
    {
      const int rc = fprintf(fp, ",");
      if (rc != 1)
        return -2;
    }
 
    const int rc = fprintf(fp, "0x%02" PRIx8, data[x]);
    if (rc != 4)
      return -2;
  }
  return 0;
}
 
static int dump_data(const wImage* img, const char* file)
{
  FILE* fp = fopen(file, "w");
  if (!fp)
  {
    (void)fprintf(stderr, "Failed to open file '%s'\n", file);
    return -1;
  }
 
  int rc = -2;
  int count = fprintf(fp, "#pragma once\n");
  if (count < 0)
    goto fail;
  count = fprintf(fp, "\n");
  if (count < 0)
    goto fail;
  count = fprintf(fp, "#include <stdint.h>\n");
  if (count < 0)
    goto fail;
  count = fprintf(fp, "\n");
  if (count < 0)
    goto fail;
  count = fprintf(fp, "static const uint8_t img_data[] ={\n");
  if (count < 0)
    goto fail;
  count = dump_data_hex(fp, img->data, 1ULL * img->height * img->scanline);
  if (count < 0)
    goto fail;
  count = fprintf(fp, "};\n");
  if (count < 0)
    goto fail;
  rc = 0;
fail:
  fclose(fp);
  return rc;
}
 
int main(int argc, char* argv[])
{
  if (argc != 3)
  {
    usage(argv[0]);
    return -1;
  }
 
  int rc = -1;
  const char* src = argv[1];
  const char* dst = argv[2];
  wImage* img = winpr_image_new();
  if (!img)
    goto fail;
 
  const int res = winpr_image_read(img, src);
  if (res <= 0)
  {
    (void)fprintf(stderr, "Failed to read image file '%s'\n", src);
    goto fail;
  }
 
  rc = dump_data(img, dst);
 
  if (rc >= 0)
    (void)printf("Converted '%s' to header '%s'\n", src, dst);
fail:
  if (rc != 0)
    usage(argv[0]);
  winpr_image_free(img, TRUE);
  return rc;
}