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Merge pull request #7283 from Robyt3/ImageLoader-Indexed-Fix

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Fix images using indexed color palette not being loadable
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Edgar 2023-10-04 13:55:21 +00:00 committed by GitHub
parent 2e5ee8287e dab88177dd
commit f5f57ee24c
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 36 additions and 52 deletions
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46
src/engine/gfx/image_loader.cpp
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@ -53,27 +53,19 @@ static void ReadDataFromLoadedBytes(png_structp pPNGStruct, png_bytep pOutBytes,
}
}
static int LibPNGGetColorChannelCount(int LibPNGColorType)
static EImageFormat LibPNGGetImageFormat(int ColorChannelCount)
{
if(LibPNGColorType == PNG_COLOR_TYPE_GRAY)
return 1;
else if(LibPNGColorType == PNG_COLOR_TYPE_PALETTE || LibPNGColorType == PNG_COLOR_TYPE_RGB)
return 3;
else if(LibPNGColorType == PNG_COLOR_TYPE_RGBA)
return 4;
return 4;
}
static void LibPNGSetImageFormat(EImageFormat &ImageFormat, int LibPNGColorType)
{
ImageFormat = IMAGE_FORMAT_RGBA;
if(LibPNGColorType == PNG_COLOR_TYPE_GRAY)
ImageFormat = IMAGE_FORMAT_R;
else if(LibPNGColorType == PNG_COLOR_TYPE_PALETTE || LibPNGColorType == PNG_COLOR_TYPE_RGB)
ImageFormat = IMAGE_FORMAT_RGB;
else if(LibPNGColorType == PNG_COLOR_TYPE_RGBA)
ImageFormat = IMAGE_FORMAT_RGBA;
switch(ColorChannelCount)
{
case 1:
return IMAGE_FORMAT_R;
case 3:
return IMAGE_FORMAT_RGB;
case 4:
return IMAGE_FORMAT_RGBA;
default:
return IMAGE_FORMAT_RGBA;
}
}
static void LibPNGDeleteReadStruct(png_structp pPNGStruct, png_infop pPNGInfo)
@ -225,11 +217,10 @@ bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIn
png_read_update_info(pPNGStruct, pPNGInfo);
const int ColorChannelCount = LibPNGGetColorChannelCount(ColorType);
const int ColorChannelCount = png_get_channels(pPNGStruct, pPNGInfo);
const int BytesInRow = png_get_rowbytes(pPNGStruct, pPNGInfo);
dbg_assert(BytesInRow == Width * ColorChannelCount, "bytes in row incorrect.");
if(BytesInRow == Width * ColorChannelCount)
{
pRowPointers = new png_bytep[Height];
for(int y = 0; y < Height; ++y)
{
@ -257,14 +248,7 @@ bool LoadPNG(SImageByteBuffer &ByteLoader, const char *pFileName, int &PngliteIn
return false;
}
LibPNGSetImageFormat(ImageFormat, ColorType);
}
else
{
LibPNGDeleteReadStruct(pPNGStruct, pPNGInfo);
dbg_msg("png", "bytes in row incorrect.");
return false;
}
ImageFormat = LibPNGGetImageFormat(ColorChannelCount);
png_destroy_info_struct(pPNGStruct, &pPNGInfo);
png_destroy_read_struct(&pPNGStruct, nullptr, nullptr);