Function ILAPIENTRY ilConvertBuffer

DevIL/src-IL/src/il_convbuff.cpp:35–1961

						}

ILAPI void* ILAPIENTRY ilConvertBuffer(ILuint SizeOfData, ILenum SrcFormat, ILenum DestFormat, ILenum SrcType, ILenum DestType, ILpal *SrcPal, void *Buffer)
{
	//static const	ILfloat LumFactor[3] = { 0.299f, 0.587f, 0.114f };  // Used for conversion to luminance
	//static const	ILfloat LumFactor[3] = { 0.3086f, 0.6094f, 0.0820f };  // http://www.sgi.com/grafica/matrix/index.html
	static const	ILfloat LumFactor[3] = { 0.212671f, 0.715160f, 0.072169f };  // http://www.inforamp.net/~poynton/ and libpng's libpng.txt

	ILubyte		*NewData = NULL;
	ILuint		i, j, c, Size;
	ILfloat		Resultf;
	ILdouble	Resultd;
	ILuint		NumPix;  // Really number of pixels * bpp.
	ILuint		BpcDest;
	void		*Data = NULL;
	ILimage		*PalImage = NULL, *TempImage = NULL;

	if (SizeOfData == 0 || Buffer == NULL) {
		ilSetError(IL_INVALID_PARAM);
		return NULL;
	}

	Data = iSwitchTypes(SizeOfData, SrcType, DestType, Buffer);
	if (Data == NULL)
		return NULL;

	BpcDest = ilGetBpcType(DestType);
	NumPix = SizeOfData / ilGetBpcType(SrcType);

	if (DestFormat == SrcFormat) {
		NewData = (ILubyte*)ialloc(NumPix * BpcDest);
		if (NewData == NULL) {
			return IL_FALSE;
		}
		memcpy(NewData, Data, NumPix * BpcDest);
		if (Data != Buffer)
			ifree(Data);

		return NewData;
	}

	// Colour-indexed images are special here
	if (SrcFormat == IL_COLOUR_INDEX) {
		// We create a temporary palette image so that we can send it to iConvertPalette.
		PalImage = (ILimage*)icalloc(1, sizeof(ILimage));  // Much better to have it all set to 0.
		if (PalImage == NULL)
			return NULL;
		// Populate the temporary palette image.
		PalImage->Pal.Palette = SrcPal->Palette;
		PalImage->Pal.PalSize = SrcPal->PalSize;
		PalImage->Pal.PalType = SrcPal->PalType;
		PalImage->Width = NumPix;
		PalImage->Height = 1;
		PalImage->Depth = 1;
		PalImage->Format = IL_COLOUR_INDEX;
		PalImage->Type = IL_UNSIGNED_BYTE;
		PalImage->Data = (ILubyte*)Buffer;
		PalImage->Bpp = 1;
		PalImage->SizeOfData = SizeOfData;