bool CxImage::AlphaPaletteSplit(CxImage *dest)
{
if (!AlphaPaletteIsValid() || !dest) return false;
CxImage tmp(head.biWidth,head.biHeight,8);
for(long y=0; y<head.biHeight; y++){
for(long x=0; x<head.biWidth; x++){
tmp.SetPixelIndex(x,y,GetPixelColor(x,y).rgbReserved);
}
}
tmp.SetGrayPalette();
dest->Transfer(tmp);
return true;
}
/**
* Blends the alpha channel and the alpha palette with the pixels. The result is a 24 bit image.
* The background color can be selected using SetTransColor().
*/
void CxImage::AlphaStrip()
{
bool bAlphaPaletteIsValid = AlphaPaletteIsValid();
bool bAlphaIsValid = AlphaIsValid();
if (!(bAlphaIsValid || bAlphaPaletteIsValid)) return;
RGBQUAD c;
long a, a1;
if (head.biBitCount==24){
for(long y=0; y<head.biHeight; y++){
for(long x=0; x<head.biWidth; x++){
c = BlindGetPixelColor(x,y);
if (bAlphaIsValid) a=(BlindAlphaGet(x,y)*info.nAlphaMax)/255; else a=info.nAlphaMax;
a1 = 256-a;
c.rgbBlue = (BYTE)((c.rgbBlue * a + a1 * info.nBkgndColor.rgbBlue)>>8);
c.rgbGreen = (BYTE)((c.rgbGreen * a + a1 * info.nBkgndColor.rgbGreen)>>8);
c.rgbRed = (BYTE)((c.rgbRed * a + a1 * info.nBkgndColor.rgbRed)>>8);
BlindSetPixelColor(x,y,c);
}
}
AlphaDelete();
} else {
/**
* Blends the alpha channel and the alpha palette with the pixels. The result is a 24 bit image.
* The background color can be selected using SetTransColor().
*/
void CxImage::AlphaStrip()
{
bool bAlphaPaletteIsValid = AlphaPaletteIsValid();
bool bAlphaIsValid = AlphaIsValid();
if (!(bAlphaIsValid || bAlphaPaletteIsValid)) return;
RGBQUAD c;
long a, a1;
if (head.biBitCount==24){
for(long y=0; y<head.biHeight; y++){
for(long x=0; x<head.biWidth; x++){
c=GetPixelColor(x,y);
if (bAlphaIsValid) a=(AlphaGet(x,y)*info.nAlphaMax)/255; else a=info.nAlphaMax;
a1 = 255-a;
c.rgbBlue = (BYTE)((c.rgbBlue * a + a1 * info.nBkgndColor.rgbBlue)/255);
c.rgbGreen = (BYTE)((c.rgbGreen * a + a1 * info.nBkgndColor.rgbGreen)/255);
c.rgbRed = (BYTE)((c.rgbRed * a + a1 * info.nBkgndColor.rgbRed)/255);
SetPixelColor(x,y,c);
}
}
AlphaDelete();
} else {
CxImage tmp(head.biWidth,head.biHeight,24);
if (!tmp.IsValid()) return;
for(long y=0; y<head.biHeight; y++){
for(long x=0; x<head.biWidth; x++){
c=GetPixelColor(x,y);
if (bAlphaIsValid) a=(AlphaGet(x,y)*info.nAlphaMax)/255; else a=info.nAlphaMax;
if (bAlphaPaletteIsValid) a=(c.rgbReserved*a)/255;
a1 = 255-a;
c.rgbBlue = (BYTE)((c.rgbBlue * a + a1 * info.nBkgndColor.rgbBlue)/255);
c.rgbGreen = (BYTE)((c.rgbGreen * a + a1 * info.nBkgndColor.rgbGreen)/255);
c.rgbRed = (BYTE)((c.rgbRed * a + a1 * info.nBkgndColor.rgbRed)/255);
tmp.SetPixelColor(x,y,c);
}
}
Transfer(tmp);
}
return;
}
