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Fixed a BGR->RGB swapping incompatibility with OptiPNG, which is even stated at the top of the file. Due to the state that it leaves libpng, and the fact that the libpng API offers no way to look at the transformed pixel data, this conversion must be done on the pixel data manually.

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This commit is contained in:
Fatbag 2012-05-30 00:04:41 -05:00
parent aced66a7af
commit 1a9433163b
1 changed files with 9 additions and 1 deletions
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10
Tools/iff2html/image.c
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@ -66,6 +66,14 @@ int WritePNG(const char * OutName, const IFFChunk * ChunkData, const IFFSprite *
Image.Width = Sprite->Width;
Image.Height = Sprite->Height;
Image.Data = Sprite->BGRA32Data;
/* Swap from BGR to RGB; this cannot be done with libpng when you use opng_reduce_image
** due to the state that it leaves png_ptr in */
for(i=0; i<Image.Width*Image.Height; i++){
uint8_t temp = Image.Data[i*4 + 0];
Image.Data[i*4 + 0] = Image.Data[i*4 + 2];
Image.Data[i*4 + 2] = temp;
}
}
row_pointers = malloc(Image.Height * sizeof(png_bytep));
@ -123,7 +131,7 @@ int WritePNG(const char * OutName, const IFFChunk * ChunkData, const IFFSprite *
png_set_rows(png_ptr, info_ptr, row_pointers);
opng_reduce_image(png_ptr, info_ptr, OPNG_REDUCE_ALL);
png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_BGR, NULL);
png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(hFile);