ximage.cpp

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 * \return the size in bytes of the internal pDib object
 */
long CxImage::GetSize()
{
	return head.biSize + head.biSizeImage + GetPaletteSize();
}
////////////////////////////////////////////////////////////////////////////////
/**
 * Checks if the coordinates are inside the image
 * \return true if x and y are both inside the image
 */
bool CxImage::IsInside(long x, long y)
{
  return (0<=y && y<head.biHeight && 0<=x && x<head.biWidth);
}
////////////////////////////////////////////////////////////////////////////////
/**
 * Sets the image bits to the specified value
 * - for indexed images, the output color is set by the palette entries.
 * - for RGB images, the output color is a shade of gray.
 */
void CxImage::Clear(BYTE bval)
{
	if (pDib == 0) return;

	if (GetBpp() == 1){
		if (bval > 0) bval = 255;
	}
	if (GetBpp() == 4){
		bval = (BYTE)(17*(0x0F & bval));
	}

	memset(info.pImage,bval,head.biSizeImage);
}
////////////////////////////////////////////////////////////////////////////////
/**
 * Transfers the image from an existing source image. The source becomes empty.
 * \return true if everything is ok
 */
bool CxImage::Transfer(CxImage &from)
{
	if (!Destroy())
		return false;

	memcpy(&head,&from.head,sizeof(BITMAPINFOHEADER));
	memcpy(&info,&from.info,sizeof(CXIMAGEINFO));

	pDib = from.pDib;
	pSelection = from.pSelection;
	pAlpha = from.pAlpha;
	pLayers = from.pLayers;

	memset(&from.head,0,sizeof(BITMAPINFOHEADER));
	memset(&from.info,0,sizeof(CXIMAGEINFO));
	from.pDib = from.pSelection = from.pAlpha = NULL;
	from.pLayers = NULL;
	return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
 * (this) points to the same pDib owned by (*from), the image remains in (*from)
 * but (this) has the access to the pixels. <b>Use carefully !!!</b>
 */
void CxImage::Ghost(CxImage *from)
{
	if (from){
		memcpy(&head,&from->head,sizeof(BITMAPINFOHEADER));
		memcpy(&info,&from->info,sizeof(CXIMAGEINFO));
		pDib = from->pDib;
		pSelection = from->pSelection;
		pAlpha = from->pAlpha;
		pLayers = from->pLayers;
		info.pGhost=from;
	}
}
////////////////////////////////////////////////////////////////////////////////
/**
 * turns a 16 or 32 bit bitfield image into a RGB image
 */
void CxImage::Bitfield2RGB(BYTE *src, WORD redmask, WORD greenmask, WORD bluemask, BYTE bpp)
{
	switch (bpp){
	case 16:
	{
		DWORD ns[3]={0,0,0};
		// compute the number of shift for each mask
		for (int i=0;i<16;i++){
			if ((redmask>>i)&0x01) ns[0]++;
			if ((greenmask>>i)&0x01) ns[1]++;
			if ((bluemask>>i)&0x01) ns[2]++;
		}
		ns[1]+=ns[0]; ns[2]+=ns[1];	ns[0]=8-ns[0]; ns[1]-=8; ns[2]-=8;
		// dword aligned width for 16 bit image
		long effwidth2=(((head.biWidth + 1) / 2) * 4);
		WORD w;
		long y2,y3,x2,x3;
		BYTE *p=info.pImage;
		// scan the buffer in reverse direction to avoid reallocations
		for (long y=head.biHeight-1; y>=0; y--){
			y2=effwidth2*y;
			y3=info.dwEffWidth*y;
			for (long x=head.biWidth-1; x>=0; x--){
				x2 = 2*x+y2;
				x3 = 3*x+y3;
				w = (WORD)(src[x2]+256*src[1+x2]);
				p[  x3]=(BYTE)((w & bluemask)<<ns[0]);
				p[1+x3]=(BYTE)((w & greenmask)>>ns[1]);
				p[2+x3]=(BYTE)((w & redmask)>>ns[2]);
			}
		}
		break;
	}
	case 32:
	{
		// dword aligned width for 32 bit image
		long effwidth4 = head.biWidth * 4;
		long y4,y3,x4,x3;
		BYTE *p=info.pImage;
		// scan the buffer in reverse direction to avoid reallocations
		for (long y=head.biHeight-1; y>=0; y--){
			y4=effwidth4*y;
			y3=info.dwEffWidth*y;
			for (long x=head.biWidth-1; x>=0; x--){
				x4 = 4*x+y4;
				x3 = 3*x+y3;
				p[  x3]=src[  x4];
				p[1+x3]=src[1+x4];
				p[2+x3]=src[2+x4];
			}
		}
	}

	}
	return;
}
////////////////////////////////////////////////////////////////////////////////
/**
 * Creates an image from a generic buffer
 * \param pArray: source memory buffer
 * \param dwWidth: image width
 * \param dwHeight: image height
 * \param dwBitsperpixel: can be 1,4,8,24,32
 * \param dwBytesperline: line alignment, in bytes, for a single row stored in pArray
 * \param bFlipImage: tune this parameter if the image is upsidedown
 * \return true if everything is ok
 */
bool CxImage::CreateFromArray(BYTE* pArray,DWORD dwWidth,DWORD dwHeight,DWORD dwBitsperpixel, DWORD dwBytesperline, bool bFlipImage)
{
	if (pArray==NULL) return false;
	if (!((dwBitsperpixel==1)||(dwBitsperpixel==4)||(dwBitsperpixel==8)||
		(dwBitsperpixel==24)||(dwBitsperpixel==32))) return false;

	if (!Create(dwWidth,dwHeight,dwBitsperpixel)) return false;

	if (dwBitsperpixel<24) SetGrayPalette();

#if CXIMAGE_SUPPORT_ALPHA
	if (dwBitsperpixel==32) AlphaCreate();
#endif //CXIMAGE_SUPPORT_ALPHA

	BYTE *dst,*src;

	for (DWORD y = 0; y<dwHeight; y++) {
		dst = info.pImage + (bFlipImage?(dwHeight-1-y):y) * info.dwEffWidth;
		src = pArray + y * dwBytesperline;
		if (dwBitsperpixel==32){
			for(DWORD x=0;x<dwWidth;x++){
				*dst++=src[0];
				*dst++=src[1];
				*dst++=src[2];
#if CXIMAGE_SUPPORT_ALPHA
				AlphaSet(x,y,src[3]);
#endif //CXIMAGE_SUPPORT_ALPHA
				src+=4;
			}
		} else {
			memcpy(dst,src,min(info.dwEffWidth,dwBytesperline));
		}
	}
	return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
 * \sa CreateFromArray
 */
bool CxImage::CreateFromMatrix(BYTE** ppMatrix,DWORD dwWidth,DWORD dwHeight,DWORD dwBitsperpixel, DWORD dwBytesperline, bool bFlipImage)
{
	if (ppMatrix==NULL) return false;
	if (!((dwBitsperpixel==1)||(dwBitsperpixel==4)||(dwBitsperpixel==8)||
		(dwBitsperpixel==24)||(dwBitsperpixel==32))) return false;

	if (!Create(dwWidth,dwHeight,dwBitsperpixel)) return false;

	if (dwBitsperpixel<24) SetGrayPalette();

#if CXIMAGE_SUPPORT_ALPHA
	if (dwBitsperpixel==32) AlphaCreate();
#endif //CXIMAGE_SUPPORT_ALPHA

	BYTE *dst,*src;

	for (DWORD y = 0; y<dwHeight; y++) {
		dst = info.pImage + (bFlipImage?(dwHeight-1-y):y) * info.dwEffWidth;
		src = ppMatrix[y];
		if (src){
			if (dwBitsperpixel==32){
				for(DWORD x=0;x<dwWidth;x++){
					*dst++=src[0];
					*dst++=src[1];
					*dst++=src[2];
#if CXIMAGE_SUPPORT_ALPHA
					AlphaSet(x,y,src[3]);
#endif //CXIMAGE_SUPPORT_ALPHA
					src+=4;
				}
			} else {
				memcpy(dst,src,min(info.dwEffWidth,dwBytesperline));
			}
		}
	}
	return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
 * \return lightness difference between elem1 and elem2
 */
int CxImage::CompareColors(const void *elem1, const void *elem2)
{
	RGBQUAD* c1 = (RGBQUAD*)elem1;
	RGBQUAD* c2 = (RGBQUAD*)elem2;

	int g1 = (int)RGB2GRAY(c1->rgbRed,c1->rgbGreen,c1->rgbBlue);
	int g2 = (int)RGB2GRAY(c2->rgbRed,c2->rgbGreen,c2->rgbBlue);
	
	return (g1-g2);
}
////////////////////////////////////////////////////////////////////////////////
/**
 * simply calls "if (memblock) free(memblock);".
 * Useful when calling Encode for a memory buffer,
 * from a DLL compiled with different memory management options.
 * CxImage::FreeMemory will use the same memory environment used by Encode. 
 */
void CxImage::FreeMemory(void* memblock)
{
	if (memblock)
		free(memblock);
}
////////////////////////////////////////////////////////////////////////////////
//EOF