ximatran.cpp

电驴的源代码

// xImaTran.cpp : Transformation functions
/* 07/08/2001 v1.00 - [e-mail]
 * CxImage version 5.71 25/Apr/2003
 */

#include "ximage.h"

#if CXIMAGE_SUPPORT_BASICTRANSFORMATIONS
////////////////////////////////////////////////////////////////////////////////
bool CxImage::GrayScale()
{
	if (!pDib) return false;
	if (head.biBitCount<=8){
		RGBQUAD* ppal=GetPalette();
		int gray;
		//converts the colors to gray, use the blue channel only
		for(DWORD i=0;i<head.biClrUsed;i++){
			gray=(int)RGB2GRAY(ppal[i].rgbRed,ppal[i].rgbGreen,ppal[i].rgbBlue);
			ppal[i].rgbBlue = (BYTE)gray;
		}
		// preserve transparency
		if (info.nBkgndIndex != -1) info.nBkgndIndex = ppal[info.nBkgndIndex].rgbBlue;
		//create a "real" 8 bit gray scale image
		if (head.biBitCount==8){
			BYTE *img=info.pImage;
			for(DWORD i=0;i<head.biSizeImage;i++) img[i]=ppal[img[i]].rgbBlue;
			SetGrayPalette();
		}
		//transform to 8 bit gray scale
		if (head.biBitCount==4 || head.biBitCount==1){
			CxImage ima(head.biWidth,head.biHeight,8,info.dwType);
			ima.SetGrayPalette();
			BYTE *img=ima.GetBits();
			long l=ima.GetEffWidth();
			for (long y=0;y<head.biHeight;y++){
				for (long x=0;x<head.biWidth; x++){
					img[x+y*l]=ppal[GetPixelIndex(x,y)].rgbBlue;
				}
			}
			Transfer(ima);
		}
	} else { //from RGB to 8 bit gray scale
		BYTE *iSrc=info.pImage;
		CxImage ima(head.biWidth,head.biHeight,8,info.dwType);
		ima.SetGrayPalette();
#if CXIMAGE_SUPPORT_ALPHA
		ima.AlphaCopy(*this);
#endif //CXIMAGE_SUPPORT_ALPHA
		BYTE *img=ima.GetBits();
		long l8=ima.GetEffWidth();
		long l=head.biWidth * 3;
		for(long y=0; y < head.biHeight; y++) {
			for(long x=0,x8=0; x < l; x+=3,x8++) {
				img[x8+y*l8]=(BYTE)RGB2GRAY(*(iSrc+x+2),*(iSrc+x+1),*(iSrc+x+0));
			}
			iSrc+=info.dwEffWidth;
		}
		Transfer(ima);
	}
	return true;
}
bool CxImage::Flip()
{
	if (!pDib) return false;
	CxImage* imatmp = new CxImage(*this,false,false,true);
	if (!imatmp) return false;
	BYTE *iSrc,*iDst;
	iSrc=info.pImage + (head.biHeight-1)*info.dwEffWidth;
	iDst=imatmp->info.pImage;
    for(long y=0; y < head.biHeight; y++){
		memcpy(iDst,iSrc,info.dwEffWidth);
		iSrc-=info.dwEffWidth;
		iDst+=info.dwEffWidth;
	}

#if CXIMAGE_SUPPORT_ALPHA
	imatmp->AlphaFlip();
#endif //CXIMAGE_SUPPORT_ALPHA

	Transfer(*imatmp);
	delete imatmp;
	return true;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::Mirror()
{
	if (!pDib) return false;

	CxImage* imatmp = new CxImage(*this,false,false,true);
	if (!imatmp) return false;
	BYTE *iSrc,*iDst;
	long wdt=(head.biWidth-1) * (head.biBitCount==24 ? 3:1);
	iSrc=info.pImage + wdt;
	iDst=imatmp->info.pImage;
	long x,y;
	switch (head.biBitCount){
	case 24:
		for(y=0; y < head.biHeight; y++){
			for(x=0; x <= wdt; x+=3){
				*(iDst+x)=*(iSrc-x);
				*(iDst+x+1)=*(iSrc-x+1);
				*(iDst+x+2)=*(iSrc-x+2);
			}
			iSrc+=info.dwEffWidth;
			iDst+=info.dwEffWidth;
		}
		break;
	case 8:
		for(y=0; y < head.biHeight; y++){
			for(x=0; x <= wdt; x++)
				*(iDst+x)=*(iSrc-x);
			iSrc+=info.dwEffWidth;
			iDst+=info.dwEffWidth;
		}
		break;
	default:
		for(y=0; y < head.biHeight; y++){
			for(x=0; x <= wdt; x++)
				imatmp->SetPixelIndex(x,y,GetPixelIndex(wdt-x,y));
		}
	}

#if CXIMAGE_SUPPORT_ALPHA
	imatmp->AlphaMirror();
#endif //CXIMAGE_SUPPORT_ALPHA

	Transfer(*imatmp);
	delete imatmp;
	return true;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::RotateLeft(CxImage* iDst)
{
	if (!pDib) return false;

	long newWidth = GetHeight();
	long newHeight = GetWidth();

	CxImage imgDest;
	imgDest.CopyInfo(*this);
	imgDest.Create(newWidth,newHeight,GetBpp(),GetType());
	imgDest.SetPalette(GetPalette());

	long x,x2,y,dlineup;
	
	// Speedy rotate for BW images <Robert Abram>
	if (head.biBitCount == 1) {
	
		BYTE *sbits, *dbits, *dbitsmax, bitpos, *nrow,*srcdisp;
		div_t div_r;

		BYTE *bsrc = GetBits(), *bdest = imgDest.GetBits();
		dbitsmax = bdest + imgDest.head.biSizeImage - 1;
		dlineup = 8 * imgDest.info.dwEffWidth - imgDest.head.biWidth;

		imgDest.Clear(0);
		for (y = 0; y < head.biHeight; y++) {
			// Figure out the Column we are going to be copying to
			div_r = div(y + dlineup, 8);
			// set bit pos of src column byte				
			bitpos = 1 << div_r.rem;
			srcdisp = bsrc + y * info.dwEffWidth;
			for (x = 0; x < (long)info.dwEffWidth; x++) {
				// Get Source Bits
				sbits = srcdisp + x;
				// Get destination column
				nrow = bdest + (x * 8) * imgDest.info.dwEffWidth + imgDest.info.dwEffWidth - 1 - div_r.quot;
				for (long z = 0; z < 8; z++) {
				   // Get Destination Byte
					dbits = nrow + z * imgDest.info.dwEffWidth;
					if ((dbits < bdest) || (dbits > dbitsmax)) break;
					if (*sbits & (128 >> z)) *dbits |= bitpos;
				}
			}
		}
	} else {
		for (x = 0; x < newWidth; x++){
			info.nProgress = (long)(100*x/newWidth); //<Anatoly Ivasyuk>
			x2=newWidth-x-1;
			for (y = 0; y < newHeight; y++){
				if(head.biClrUsed==0)	//RGB
					imgDest.SetPixelColor(x, y, GetPixelColor(y, x2));
				else					//PALETTE
					imgDest.SetPixelIndex(x, y, GetPixelIndex(y, x2));
			}
		}
	}

#if CXIMAGE_SUPPORT_ALPHA
	if (AlphaIsValid()){
		imgDest.AlphaCreate();
		for (x = 0; x < newWidth; x++){
			x2=newWidth-x-1;
			for (y = 0; y < newHeight; y++){
				imgDest.AlphaSet(x,y,AlphaGet(y, x2));
			}
		}
	}
#endif //CXIMAGE_SUPPORT_ALPHA

	//select the destination
	if (iDst) iDst->Transfer(imgDest);
	else Transfer(imgDest);
	return true;
}

////////////////////////////////////////////////////////////////////////////////
bool CxImage::RotateRight(CxImage* iDst)
{
	if (!pDib) return false;

	long newWidth = GetHeight();
	long newHeight = GetWidth();

	CxImage imgDest;
	imgDest.CopyInfo(*this);
	imgDest.Create(newWidth,newHeight,GetBpp(),GetType());
	imgDest.SetPalette(GetPalette());

	long x,y,y2;
	// Speedy rotate for BW images <Robert Abram>
	if (head.biBitCount == 1) {
	
		BYTE *sbits, *dbits, *dbitsmax, bitpos, *nrow,*srcdisp;
		div_t div_r;

		BYTE *bsrc = GetBits(), *bdest = imgDest.GetBits();
		dbitsmax = bdest + imgDest.head.biSizeImage - 1;

		imgDest.Clear(0);
		for (y = 0; y < head.biHeight; y++) {
			// Figure out the Column we are going to be copying to
			div_r = div(y, 8);
			// set bit pos of src column byte				
			bitpos = 128 >> div_r.rem;
			srcdisp = bsrc + y * info.dwEffWidth;
			for (x = 0; x < (long)info.dwEffWidth; x++) {
				// Get Source Bits
				sbits = srcdisp + x;
				// Get destination column
				nrow = bdest + (imgDest.head.biHeight-1-(x*8)) * imgDest.info.dwEffWidth + div_r.quot;
				for (long z = 0; z < 8; z++) {
				   // Get Destination Byte
					dbits = nrow - z * imgDest.info.dwEffWidth;
					if ((dbits < bdest) || (dbits > dbitsmax)) break;
					if (*sbits & (128 >> z)) *dbits |= bitpos;
				}
			}
		}
	} else {
		for (y = 0; y < newHeight; y++){
			info.nProgress = (long)(100*y/newHeight); //<Anatoly Ivasyuk>
			y2=newHeight-y-1;
			for (x = 0; x < newWidth; x++){
				if(head.biClrUsed==0)	//RGB
					imgDest.SetPixelColor(x, y, GetPixelColor(y2, x));
				else					//PALETTE
					imgDest.SetPixelIndex(x, y, GetPixelIndex(y2, x));
			}
		}
	}

#if CXIMAGE_SUPPORT_ALPHA
	if (AlphaIsValid()){
		imgDest.AlphaCreate();
		for (y = 0; y < newHeight; y++){
			y2=newHeight-y-1;
			for (x = 0; x < newWidth; x++){
				imgDest.AlphaSet(x,y,AlphaGet(y2, x));
			}
		}
	}
#endif //CXIMAGE_SUPPORT_ALPHA

	//select the destination
	if (iDst) iDst->Transfer(imgDest);
	else Transfer(imgDest);
	return true;
}

////////////////////////////////////////////////////////////////////////////////
bool CxImage::Negative()