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Add support for PNG with palette

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bzt 2021-02-18 11:21:03 +01:00
parent 8d21415f4e
commit bd5bf74c2d
1 changed files with 3 additions and 10 deletions
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13
examples/0C_png/png.c
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@ -38,18 +38,11 @@ err: fprintf(stderr, "unable to allocate memory\n");
s.read_from_callbacks = 0;
s.img_buffer = s.img_buffer_original = buff;
s.img_buffer_end = s.img_buffer_original_end = buff + size;
data = (uint32_t*)stbi__png_load(&s, &w, &h, &l, 0, &ri);
if(!data || (l != 3 && l != 4)) {
fprintf(stderr, "Unable to decode png: %s\n", l < 3 ? "not RGB format" : stbi__g_failure_reason );
data = (uint32_t*)stbi__png_load(&s, &w, &h, &l, 4, &ri);
if(!data) {
fprintf(stdout, "Unable to decode png: %s\n", stbi__g_failure_reason);
return 0;
}
/* if we got 24 bit RGB image, convert it to 32 bit RGBA */
if(l == 3) {
data = (uint32_t*)realloc(data, w * h * 4);
if(!data) goto err;
for(l = w * h - 1; l >= 0; l--)
data[l] = (*((uint32_t*)((uint8_t*)data + l * 3)) & 0xffffff);
}
} else {
fprintf(stderr, "Unable to load image\n");
return 0;