ximatran.cpp

用Cximage 库显示各种格式图片小程序

				y2=newHeight-y-1;
				for (x = 0; x < newWidth; x++){
					imgDest.SelectionSet(x,y,BlindSelectionGet(y2, x));
				}
			}
		}
#endif //CXIMAGE_SUPPORT_SELECTION

	} else {
		//anything else but BW
		BYTE *srcPtr, *dstPtr;                        //source and destionation for 24-bit version
		int xs, ys;                                   //x-segment and y-segment
		for (xs = 0; xs < newWidth; xs+=RBLOCK) {
			for (ys = 0; ys < newHeight; ys+=RBLOCK) {
				if (head.biBitCount==24) {
					//RGB24 optimized pixel access:
					for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
						info.nProgress = (long)(100*y/newHeight); //<Anatoly Ivasyuk>
						y2=newHeight-y-1;
						dstPtr = (BYTE*) imgDest.BlindGetPixelPointer(xs,y);
						srcPtr = (BYTE*) BlindGetPixelPointer(y2, xs);
						for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
							//imgDest.SetPixelColor(x, y, GetPixelColor(y2, x));
							*(dstPtr) = *(srcPtr);
							*(dstPtr+1) = *(srcPtr+1);
							*(dstPtr+2) = *(srcPtr+2);
							dstPtr += 3;
							srcPtr += info.dwEffWidth;
						}//for x
					}//for y
				} else {
					//anything else than BW & RGB24: palette
					for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
						info.nProgress = (long)(100*y/newHeight); //<Anatoly Ivasyuk>
						y2=newHeight-y-1;
						for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
							imgDest.SetPixelIndex(x, y, BlindGetPixelIndex(y2, x));
						}//for x
					}//for y
				}//if
#if CXIMAGE_SUPPORT_ALPHA
				if (AlphaIsValid()){
					for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
						y2=newHeight-y-1;
						for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
							imgDest.AlphaSet(x,y,BlindAlphaGet(y2, x));
						}//for x
					}//for y
				}//if (has alpha)
#endif //CXIMAGE_SUPPORT_ALPHA

#if CXIMAGE_SUPPORT_SELECTION
				if (SelectionIsValid()){
					imgDest.info.rSelectionBox.left = info.rSelectionBox.bottom;
					imgDest.info.rSelectionBox.right = info.rSelectionBox.top;
					imgDest.info.rSelectionBox.bottom = newHeight-info.rSelectionBox.right;
					imgDest.info.rSelectionBox.top = newHeight-info.rSelectionBox.left;
					for (y = ys; y < min(newHeight, ys+RBLOCK); y++){
						y2=newHeight-y-1;
						for (x = xs; x < min(newWidth, xs+RBLOCK); x++){
							imgDest.SelectionSet(x,y,BlindSelectionGet(y2, x));
						}//for x
					}//for y
				}//if (has alpha)
#endif //CXIMAGE_SUPPORT_SELECTION
			}//for ys
		}//for xs
	}//if

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

////////////////////////////////////////////////////////////////////////////////
bool CxImage::Negative()
{
	if (!pDib) return false;

	if (head.biBitCount<=8){
		if (IsGrayScale()){ //GRAYSCALE, selection
			if (pSelection){
				for(long y=info.rSelectionBox.bottom; y<info.rSelectionBox.top; y++){
					for(long x=info.rSelectionBox.left; x<info.rSelectionBox.right; x++){
#if CXIMAGE_SUPPORT_SELECTION
						if (BlindSelectionIsInside(x,y))
#endif //CXIMAGE_SUPPORT_SELECTION
						{
							BlindSetPixelIndex(x,y,(BYTE)(255-BlindGetPixelIndex(x,y)));
						}
					}
				}
			} else {
				BYTE *iSrc=info.pImage;
				for(unsigned long i=0; i < head.biSizeImage; i++){
					*iSrc=(BYTE)~(*(iSrc));
					iSrc++;
				}
			}
		} else { //PALETTE, full image
			RGBQUAD* ppal=GetPalette();
			for(DWORD i=0;i<head.biClrUsed;i++){
				ppal[i].rgbBlue =(BYTE)(255-ppal[i].rgbBlue);
				ppal[i].rgbGreen =(BYTE)(255-ppal[i].rgbGreen);
				ppal[i].rgbRed =(BYTE)(255-ppal[i].rgbRed);
			}
		}
	} else {
		if (pSelection==NULL){ //RGB, full image
			BYTE *iSrc=info.pImage;
			for(unsigned long i=0; i < head.biSizeImage; i++){
				*iSrc=(BYTE)~(*(iSrc));
				iSrc++;
			}
		} else { // RGB with selection
			RGBQUAD color;
			for(long y=info.rSelectionBox.bottom; y<info.rSelectionBox.top; y++){
				for(long x=info.rSelectionBox.left; x<info.rSelectionBox.right; x++){
#if CXIMAGE_SUPPORT_SELECTION
					if (BlindSelectionIsInside(x,y))
#endif //CXIMAGE_SUPPORT_SELECTION
					{
						color = BlindGetPixelColor(x,y);
						color.rgbRed = (BYTE)(255-color.rgbRed);
						color.rgbGreen = (BYTE)(255-color.rgbGreen);
						color.rgbBlue = (BYTE)(255-color.rgbBlue);
						BlindSetPixelColor(x,y,color);
					}
				}
			}
		}
		//<DP> invert transparent color too
		info.nBkgndColor.rgbBlue = (BYTE)(255-info.nBkgndColor.rgbBlue);
		info.nBkgndColor.rgbGreen = (BYTE)(255-info.nBkgndColor.rgbGreen);
		info.nBkgndColor.rgbRed = (BYTE)(255-info.nBkgndColor.rgbRed);
	}
	return true;
}

////////////////////////////////////////////////////////////////////////////////
#endif //CXIMAGE_SUPPORT_BASICTRANSFORMATIONS
////////////////////////////////////////////////////////////////////////////////
#if CXIMAGE_SUPPORT_TRANSFORMATION
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
bool CxImage::Rotate(float angle, CxImage* iDst)
{
	if (!pDib) return false;

	//  Copyright (c) 1996-1998 Ulrich von Zadow

	// Negative the angle, because the y-axis is negative.
	double ang = -angle*acos((float)0)/90;
	int newWidth, newHeight;
	int nWidth = GetWidth();
	int nHeight= GetHeight();
	double cos_angle = cos(ang);
	double sin_angle = sin(ang);

	// Calculate the size of the new bitmap
	POINT p1={0,0};
	POINT p2={nWidth,0};
	POINT p3={0,nHeight};
	POINT p4={nWidth,nHeight};
	CxPoint2 newP1,newP2,newP3,newP4, leftTop, rightTop, leftBottom, rightBottom;

	newP1.x = (float)p1.x;
	newP1.y = (float)p1.y;
	newP2.x = (float)(p2.x*cos_angle - p2.y*sin_angle);
	newP2.y = (float)(p2.x*sin_angle + p2.y*cos_angle);
	newP3.x = (float)(p3.x*cos_angle - p3.y*sin_angle);
	newP3.y = (float)(p3.x*sin_angle + p3.y*cos_angle);
	newP4.x = (float)(p4.x*cos_angle - p4.y*sin_angle);
	newP4.y = (float)(p4.x*sin_angle + p4.y*cos_angle);

	leftTop.x = min(min(newP1.x,newP2.x),min(newP3.x,newP4.x));
	leftTop.y = min(min(newP1.y,newP2.y),min(newP3.y,newP4.y));
	rightBottom.x = max(max(newP1.x,newP2.x),max(newP3.x,newP4.x));
	rightBottom.y = max(max(newP1.y,newP2.y),max(newP3.y,newP4.y));
	leftBottom.x = leftTop.x;
	leftBottom.y = rightBottom.y;
	rightTop.x = rightBottom.x;
	rightTop.y = leftTop.y;

	newWidth = (int) floor(0.5f + rightTop.x - leftTop.x);
	newHeight= (int) floor(0.5f + leftBottom.y - leftTop.y);
	CxImage imgDest;
	imgDest.CopyInfo(*this);
	imgDest.Create(newWidth,newHeight,GetBpp(),GetType());
	imgDest.SetPalette(GetPalette());

#if CXIMAGE_SUPPORT_ALPHA
	if(AlphaIsValid())	//MTA: Fix for rotation problem when the image has an alpha channel
	{
		imgDest.AlphaCreate();
		imgDest.AlphaClear();
	}
#endif //CXIMAGE_SUPPORT_ALPHA

	int x,y,newX,newY,oldX,oldY;

	if (head.biClrUsed==0){ //RGB
		for (y = (int)leftTop.y, newY = 0; y<=(int)leftBottom.y; y++,newY++){
			info.nProgress = (long)(100*newY/newHeight);
			if (info.nEscape) break;
			for (x = (int)leftTop.x, newX = 0; x<=(int)rightTop.x; x++,newX++){
				oldX = (long)(x*cos_angle + y*sin_angle + 0.5);
				oldY = (long)(y*cos_angle - x*sin_angle + 0.5);
				imgDest.SetPixelColor(newX,newY,GetPixelColor(oldX,oldY));
#if CXIMAGE_SUPPORT_ALPHA
				imgDest.AlphaSet(newX,newY,AlphaGet(oldX,oldY));				//MTA: copy the alpha value
#endif //CXIMAGE_SUPPORT_ALPHA
			}
		}
	} else { //PALETTE
		for (y = (int)leftTop.y, newY = 0; y<=(int)leftBottom.y; y++,newY++){
			info.nProgress = (long)(100*newY/newHeight);
			if (info.nEscape) break;
			for (x = (int)leftTop.x, newX = 0; x<=(int)rightTop.x; x++,newX++){
				oldX = (long)(x*cos_angle + y*sin_angle + 0.5);
				oldY = (long)(y*cos_angle - x*sin_angle + 0.5);
				imgDest.SetPixelIndex(newX,newY,GetPixelIndex(oldX,oldY));
#if CXIMAGE_SUPPORT_ALPHA
				imgDest.AlphaSet(newX,newY,AlphaGet(oldX,oldY));				//MTA: copy the alpha value
#endif //CXIMAGE_SUPPORT_ALPHA
			}
		}
	}
	//select the destination
	if (iDst) iDst->Transfer(imgDest);
	else Transfer(imgDest);

	return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
 * Rotates image around it's center.
 * Method can use interpolation with paletted images, but does not change pallete, so results vary.
 * (If you have only four colours in a palette, there's not much room for interpolation.)
 * 
 * \param  angle - angle in degrees (positive values rotate clockwise)
 * \param  *iDst - destination image (if null, this image is changed)
 * \param  inMethod - interpolation method used
 *              (IM_NEAREST_NEIGHBOUR produces aliasing (fast), IM_BILINEAR softens picture a bit (slower)
 *               IM_SHARPBICUBIC is slower and produces some halos...)
 * \param  ofMethod - overflow method (how to choose colour of pixels that have no source)
 * \param  replColor - replacement colour to use (OM_COLOR, OM_BACKGROUND with no background colour...)
 * \param  optimizeRightAngles - call faster methods for 90, 180, and 270 degree rotations. Faster methods
 *                         are called for angles, where error (in location of corner pixels) is less
 *                         than 0.25 pixels.
 * \param  bKeepOriginalSize - rotates the image without resizing.
 *
 * \author ***bd*** 2.2004
 */
bool CxImage::Rotate2(float angle, 
                       CxImage *iDst, 
                       InterpolationMethod inMethod, 
                       OverflowMethod ofMethod, 
                       RGBQUAD *replColor,
                       bool const optimizeRightAngles,
					   bool const bKeepOriginalSize)
{
	if (!pDib) return false;					//no dib no go
	
	double ang = -angle*acos(0.0f)/90.0f;		//convert angle to radians and invert (positive angle performs clockwise rotation)
	float cos_angle = (float) cos(ang);			//these two are needed later (to rotate)
	float sin_angle = (float) sin(ang);
	
	//Calculate the size of the new bitmap (rotate corners of image)
	CxPoint2 p[4];								//original corners of the image
	p[0]=CxPoint2(-0.5f,-0.5f);
	p[1]=CxPoint2(GetWidth()-0.5f,-0.5f);
	p[2]=CxPoint2(-0.5f,GetHeight()-0.5f);
	p[3]=CxPoint2(GetWidth()-0.5f,GetHeight()-0.5f);
	CxPoint2 newp[4];								//rotated positions of corners
	//(rotate corners)
	if (bKeepOriginalSize){
		for (int i=0; i<4; i++) {
			newp[i].x = p[i].x;
			newp[i].y = p[i].y;
		}//for
	} else {
		for (int i=0; i<4; i++) {
			newp[i].x = (p[i].x*cos_angle - p[i].y*sin_angle);
			newp[i].y = (p[i].x*sin_angle + p[i].y*cos_angle);
		}//for i
		
		if (optimizeRightAngles) { 
			//For rotations of 90, -90 or 180 or 0 degrees, call faster routines
			if (newp[3].Distance(CxPoint2(GetHeight()-0.5f, 0.5f-GetWidth())) < 0.25) 
				//rotation right for circa 90 degrees (diagonal pixels less than 0.25 pixel away from 90 degree rotation destination)
				return RotateRight(iDst);
			if (newp[3].Distance(CxPoint2(0.5f-GetHeight(), -0.5f+GetWidth())) < 0.25) 
				//rotation left for ~90 degrees
				return RotateLeft(iDst);
			if (newp[3].Distance(CxPoint2(0.5f-GetWidth(), 0.5f-GetHeight())) < 0.25) 
				//rotation left for ~180 degrees
				return Rotate180(iDst);
			if (newp[3].Distance(p[3]) < 0.25) {
				//rotation not significant
				if (iDst) iDst->Copy(*this);		//copy image to iDst, if required
				return true;						//and we're done
			}//if
		}//if
	}//if

	//(read new dimensions from location of corners)
	float minx = (float) min(min(newp[0].x,newp[1].x),min(newp[2].x,newp[3].x));
	float miny = (float) min(min(newp[0].y,newp[1].y),min(newp[2].y,newp[3].y));
	float maxx = (float) max(max(newp[0].x,newp[1].x),max(newp[2].x,newp[3].x));
	float maxy = (float) max(max(newp[0].y,newp[1].y),max(newp[2].y,newp[3].y));
	int newWidth = (int) floor(maxx-minx+0.5f);
	int newHeight= (int) floor(maxy-miny+0.5f);
	float ssx=((maxx+minx)- ((float) newWidth-1))/2.0f;   //start for x
	float ssy=((maxy+miny)- ((float) newHeight-1))/2.0f;  //start for y

	float newxcenteroffset = 0.5f * newWidth;
	float newycenteroffset = 0.5f * newHeight;
	if (bKeepOriginalSize){
		ssx -= 0.5f * GetWidth();
		ssy -= 0.5f * GetHeight();
	}

	//create destination image
	CxImage imgDest;
	imgDest.CopyInfo(*this);
	imgDest.Create(newWidth,newHeight,GetBpp(),GetType());
	imgDest.SetPalette(GetPalette());
#if CXIMAGE_SUPPORT_ALPHA
	if(AlphaIsValid()) imgDest.AlphaCreate(); //MTA: Fix for rotation problem when the image has an alpha channel
#endif //CXIMAGE_SUPPORT_ALPHA
	
	RGBQUAD rgb;			//pixel colour
	RGBQUAD rc;
	if (replColor!=0) 
		rc=*replColor; 
	else {
		rc.rgbRed=255; rc.rgbGreen=255; rc.rgbBlue=255; rc.rgbReserved=0;
	}//if
	float x,y;              //destination location (float, with proper offset)
	float origx, origy;     //origin location
	int destx, desty;       //destination location
	
	y=ssy;                  //initialize y
	if (!IsIndexed()){ //RGB24
		//optimized RGB24 implementation (direct write to destination):
		BYTE *pxptr;
#if CXIMAGE_SUPPORT_ALPHA
		BYTE *pxptra=0;
#endif //CXIMAGE_SUPPORT_ALPHA
		for (desty=0; desty<newHeight; desty++) {
			info.nProgress = (long)(100*desty/newHeight);
			if (info.nEscape) break;
			//initialize x
			x=ssx;
			//calculate pointer to first byte in row
			pxptr=(BYTE *)imgDest.BlindGetPixelPointer(0, desty);
#if CXIMAGE_SUPPORT_ALPHA
			//calculate pointer to first byte in row
			if (AlphaIsValid()) pxptra=imgDest.AlphaGetPointer(0, desty);
#endif //CXIMAGE_SUPPORT_ALPHA
			for (destx=0; destx<newWidth; destx++) {
				//get source pixel coordinate for current destination point
				//origx = (cos_angle*(x-head.biWidth/2)+sin_angle*(y-head.biHeight/2))+newWidth/2;
				//origy = (cos_angle*(y-head.biHeight/2)-sin_angle*(x-head.biWidth/2))+newHeight/2;
				origx = cos_angle*x+sin_angle*y;
				origy = cos_angle*y-sin_angle*x;
				if (bKeepOriginalSize){
					origx += newxcenteroffset;
					origy += newycenteroffset;
				}
				rgb = GetPixelColorInterpolated(origx, origy, inMethod, ofMethod, &rc);   //get interpolated colour value
				//copy alpha and colour value to destination
#if CXIMAGE_SUPPORT_ALPHA
				if (pxptra) *pxptra++ = rgb.rgbReserved;
#endif //CXIMAGE_SUPPORT_ALPHA
				*pxptr++ = rgb.rgbBlue;
				*pxptr++ = rgb.rgbGreen;
				*pxptr++ = rgb.rgbRed;
				x++;
			}//for destx
			y++;
		}//for desty
	} else { 
		//non-optimized implementation for paletted images
		for (desty=0; desty<newHeight; desty++) {
			info.nProgress = (long)(100*desty/newHeight);
			if (info.nEscape) break;
			x=ssx;
			for (destx=0; destx<newWidth; destx++) {
				//get source pixel coordinate for current destination point
				origx=(cos_angle*x+sin_angle*y);
				origy=(cos_angle*y-sin_angle*x);
				if (bKeepOriginalSize){
					origx += newxcenteroffset;
					origy += newycenteroffset;
				}
				rgb = GetPixelColorInterpolated(origx, origy, inMethod, ofMethod, &rc);
				//***!*** SetPixelColor is slow for palleted images
#if CXIMAGE_SUPPORT_ALPHA
				if (AlphaIsValid()) 
					imgDest.SetPixelColor(destx,desty,rgb,true);
				else 
#endif //CXIMAGE_SUPPORT_ALPHA     
					imgDest.SetPixelColor(destx,desty,rgb,false);
				x++;
			}//for destx
			y++;
		}//for desty
	}
	//select the destination