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Support loading of 24 bit png.

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This commit is contained in:
King_DuckZ 2014-03-06 10:55:14 +01:00
parent d27b5773ca
commit 83d139d4b5
1 changed files with 36 additions and 9 deletions
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45
src/texture.cpp
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@ -38,6 +38,11 @@ namespace cloonel {
GraphicFormat_Png
};
enum PixelFormat {
PixelFormat_RGB_24,
PixelFormat_RGBA_32
};
enum ColorChannelMask {
#if __BYTE_ORDER == __BIG_ENDIAN
ColorChannelMask_Red = 0xff000000,
@ -68,7 +73,7 @@ namespace cloonel {
///----------------------------------------------------------------------
///----------------------------------------------------------------------
SDL_Surface* SurfaceFromPngRGBA (ushort2 parSize, int parBpp, const png_structp& parPngPtr, const png_infop& parInfoPtr, std::vector<uint8_t>& parBuff) {
SDL_Surface* SurfaceFromPng (PixelFormat parPixelFormat, ushort2 parSize, const png_structp& parPngPtr, const png_infop& parInfoPtr, std::vector<uint8_t>& parBuff) {
const png_size_t stride = png_get_rowbytes(parPngPtr, parInfoPtr);
assert(stride > 0);
@ -79,16 +84,37 @@ namespace cloonel {
png_read_row(parPngPtr, imagePtr + stride * y, nullptr);
}
int bpp;
uint32_t redMask, greenMask, blueMask, alphaMask;
switch (parPixelFormat) {
case PixelFormat_RGB_24:
bpp = 24;
redMask = ColorChannelMask_Red;
greenMask = ColorChannelMask_Green;
blueMask = ColorChannelMask_Blue;
alphaMask = 0;
break;
case PixelFormat_RGBA_32:
bpp = 32;
redMask = ColorChannelMask_Red;
greenMask = ColorChannelMask_Green;
blueMask = ColorChannelMask_Blue;
alphaMask = ColorChannelMask_Alpha;
break;
default:
assert(false);
}
SDL_Surface* const retSurf = SDL_CreateRGBSurfaceFrom(
imagePtr,
parSize.x(),
parSize.y(),
parBpp,
bpp,
static_cast<int>(stride),
ColorChannelMask_Red,
ColorChannelMask_Green,
ColorChannelMask_Blue,
ColorChannelMask_Alpha
redMask,
greenMask,
blueMask,
alphaMask
);
return retSurf;
}
@ -168,12 +194,13 @@ namespace cloonel {
SDL_Surface* retSurf;
switch (colorType) {
case PNG_COLOR_TYPE_RGB:
retSurf = nullptr; //SurfaceFromPngRGB();
assert(false); //not implemented
assert(3 * bitDepth == 24);
retSurf = SurfaceFromPng(PixelFormat_RGB_24, ushort2(static_cast<uint8_t>(width), static_cast<uint8_t>(height)), pngptr, infoptr, parBuff);
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
retSurf = SurfaceFromPngRGBA(ushort2(static_cast<uint8_t>(width), static_cast<uint8_t>(height)), bitDepth * 4, pngptr, infoptr, parBuff);
assert(bitDepth * 4 == 32);
retSurf = SurfaceFromPng(PixelFormat_RGBA_32, ushort2(static_cast<uint8_t>(width), static_cast<uint8_t>(height)), pngptr, infoptr, parBuff);
break;
default: