ximatran.cpp

用Cximage 库显示各种格式图片小程序

			}
		}
		break;
	}
	case 4:
	{
		//Jarvis, Judice and Ninke error diffusion (Thanks to Franco Gerevini)
		int TotalCoeffSum = 48;
		long error, nlevel, coeff=1;
		BYTE level;

		for (long y = 0; y < head.biHeight; y++) {
			info.nProgress = (long)(100 * y / head.biHeight);
			if (info.nEscape) 
				break;
			for (long x = 0; x < head.biWidth; x++) {
				level = BlindGetPixelIndex(x, y);
				if (level > 128) {
					tmp.SetPixelIndex(x, y, 1);
					error = level - 255;
				} else {
					tmp.SetPixelIndex(x, y, 0);
					error = level;
				}

				nlevel = GetPixelIndex(x + 1, y) + (error * 7) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(x + 1, y, level);
				nlevel = GetPixelIndex(x + 2, y) + (error * 5) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(x + 2, y, level);
				int i;
				for (i = -2; i < 3; i++) {
					switch (i) {
					case -2:
						coeff = 3;
						break;
					case -1:
						coeff = 5;
						break;
					case 0:
						coeff = 7; 
						break;
					case 1:
						coeff = 5; 
						break;
					case 2:
						coeff = 3; 
						break;
					}
					nlevel = GetPixelIndex(x + i, y + 1) + (error * coeff) / TotalCoeffSum;
					level = (BYTE)min(255, max(0, (int)nlevel));
					SetPixelIndex(x + i, y + 1, level);
				}
				for (i = -2; i < 3; i++) {
					switch (i) {
					case -2:
						coeff = 1;
						break;
					case -1:
						coeff = 3;
						break;
					case 0:
						coeff = 5; 
						break;
					case 1:
						coeff = 3; 
						break;
					case 2:
						coeff = 1; 
						break;
					}
					nlevel = GetPixelIndex(x + i, y + 2) + (error * coeff) / TotalCoeffSum;
					level = (BYTE)min(255, max(0, (int)nlevel));
					SetPixelIndex(x + i, y + 2, level);
				}
			}
		}
		break;
	}
	case 5:
	{
		//Sierra error diffusion (Thanks to Franco Gerevini)
		int TotalCoeffSum = 32;
		long error, nlevel, coeff=1;
		BYTE level;

		for (long y = 0; y < head.biHeight; y++) {
			info.nProgress = (long)(100 * y / head.biHeight);
			if (info.nEscape) 
				break;
			for (long x = 0; x < head.biWidth; x++) {
				level = BlindGetPixelIndex(x, y);
				if (level > 128) {
					tmp.SetPixelIndex(x, y, 1);
					error = level - 255;
				} else {
					tmp.SetPixelIndex(x, y, 0);
					error = level;
				}

				nlevel = GetPixelIndex(x + 1, y) + (error * 5) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(x + 1, y, level);
				nlevel = GetPixelIndex(x + 2, y) + (error * 3) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(x + 2, y, level);
				int i;
				for (i = -2; i < 3; i++) {
					switch (i) {
					case -2:
						coeff = 2;
						break;
					case -1:
						coeff = 4;
						break;
					case 0:
						coeff = 5; 
						break;
					case 1:
						coeff = 4; 
						break;
					case 2:
						coeff = 2; 
						break;
					}
					nlevel = GetPixelIndex(x + i, y + 1) + (error * coeff) / TotalCoeffSum;
					level = (BYTE)min(255, max(0, (int)nlevel));
					SetPixelIndex(x + i, y + 1, level);
				}
				for (i = -1; i < 2; i++) {
					switch (i) {
					case -1:
						coeff = 2;
						break;
					case 0:
						coeff = 3; 
						break;
					case 1:
						coeff = 2; 
						break;
					}
					nlevel = GetPixelIndex(x + i, y + 2) + (error * coeff) / TotalCoeffSum;
					level = (BYTE)min(255, max(0, (int)nlevel));
					SetPixelIndex(x + i, y + 2, level);
				}
			}
		}
		break;
	}
	case 6:
	{
		//Stevenson and Arce error diffusion (Thanks to Franco Gerevini)
		int TotalCoeffSum = 200;
		long error, nlevel;
		BYTE level;

		for (long y = 0; y < head.biHeight; y++) {
			info.nProgress = (long)(100 * y / head.biHeight);
			if (info.nEscape) 
				break;
			for (long x = 0; x < head.biWidth; x++) {
				level = BlindGetPixelIndex(x, y);
				if (level > 128) {
					tmp.SetPixelIndex(x, y, 1);
					error = level - 255;
				} else {
					tmp.SetPixelIndex(x, y, 0);
					error = level;
				}

				int tmp_index_x = x + 2;
				int tmp_index_y = y;
				int tmp_coeff = 32;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x - 3;
				tmp_index_y = y + 1;
				tmp_coeff = 12;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x - 1;
				tmp_coeff = 26;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x + 1;
				tmp_coeff = 30;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x + 3;
				tmp_coeff = 16;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x - 2;
				tmp_index_y = y + 2;
				tmp_coeff = 12;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x;
				tmp_coeff = 26;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x + 2;
				tmp_coeff = 12;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x - 3;
				tmp_index_y = y + 3;
				tmp_coeff = 5;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x - 1;
				tmp_coeff = 12;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x + 1;
				tmp_coeff = 12;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);

				tmp_index_x = x + 3;
				tmp_coeff = 5;
				nlevel = GetPixelIndex(tmp_index_x, tmp_index_y) + (error * tmp_coeff) / TotalCoeffSum;
				level = (BYTE)min(255, max(0, (int)nlevel));
				SetPixelIndex(tmp_index_x, tmp_index_y, level);
			}
		}
		break;
	}
	case 7:
	{
		// Bayer ordered dither
		int order = 4;
		//create Bayer matrix
		if (order>4) order = 4;
		int size = (1 << (2*order));
		BYTE* Bmatrix = (BYTE*) malloc(size * sizeof(BYTE));
		for(int i = 0; i < size; i++) {
			int n = order;
			int x = i / n;
			int y = i % n;
			int dither = 0;
			while (n-- > 0){
				dither = (((dither<<1)|((x&1) ^ (y&1)))<<1) | (y&1);
				x >>= 1;
				y >>= 1;
			}
			Bmatrix[i] = (BYTE)(dither);
		}

		int scale = max(0,(8-2*order));
		int level;
		for (long y=0;y<head.biHeight;y++){
			info.nProgress = (long)(100*y/head.biHeight);
			if (info.nEscape) break;
			for (long x=0;x<head.biWidth;x++){
				level = BlindGetPixelIndex(x,y) >> scale;
				if(level > Bmatrix[ (x % order) + order * (y % order) ]){
					tmp.SetPixelIndex(x,y,1);
				} else {
					tmp.SetPixelIndex(x,y,0);
				}
			}
		}

		free(Bmatrix);

		break;
	}
	default:
	{
		// Floyd-Steinberg error diffusion (Thanks to Steve McMahon)
		long error,nlevel,coeff=1;
		BYTE level;

		for (long y=0;y<head.biHeight;y++){
			info.nProgress = (long)(100*y/head.biHeight);
			if (info.nEscape) break;
			for (long x=0;x<head.biWidth;x++){

				level = BlindGetPixelIndex(x,y);
				if (level > 128){
					tmp.SetPixelIndex(x,y,1);
					error = level-255;
				} else {
					tmp.SetPixelIndex(x,y,0);
					error = level;
				}

				nlevel = GetPixelIndex(x+1,y) + (error * 7)/16;
				level = (BYTE)min(255,max(0,(int)nlevel));
				SetPixelIndex(x+1,y,level);
				for(int i=-1; i<2; i++){
					switch(i){
					case -1:
						coeff=3; break;
					case 0:
						coeff=5; break;
					case 1:
						coeff=1; break;
					}
					nlevel = GetPixelIndex(x+i,y+1) + (error * coeff)/16;
					level = (BYTE)min(255,max(0,(int)nlevel));
					SetPixelIndex(x+i,y+1,level);
				}
			}
		}
	}
	}

	tmp.SetPaletteColor(0,0,0,0);
	tmp.SetPaletteColor(1,255,255,255);
	Transfer(tmp);

	return true;
}
////////////////////////////////////////////////////////////////////////////////
/**
 *	CropRotatedRectangle
 * \param topx,topy : topmost and leftmost point of the rectangle 
          (topmost, and if there are 2 topmost points, the left one)
 * \param  width     : size of the right hand side of rect, from (topx,topy) roundwalking clockwise
 * \param  height    : size of the left hand side of rect, from (topx,topy) roundwalking clockwise
 * \param  angle     : angle of the right hand side of rect, from (topx,topy)
 * \param  iDst      : pointer to destination image (if 0, this image is modified)
 * \author  [VATI]
 */
bool CxImage::CropRotatedRectangle( long topx, long topy, long width, long height, float angle, CxImage* iDst)
{
	if (!pDib) return false;

	
	long startx,starty,endx,endy;
	double cos_angle = cos(angle/*/57.295779513082320877*/);
    double sin_angle = sin(angle/*/57.295779513082320877*/);

	// if there is nothing special, call the original Crop():
	if ( fabs(angle)<0.0002 )
		return Crop( topx, topy, topx+width, topy+height, iDst);

	startx = min(topx, topx - (long)(sin_angle*(double)height));
	endx   = topx + (long)(cos_angle*(double)width);
	endy   = topy + (long)(cos_angle*(double)height + sin_angle*(double)width);
	// check: corners of the rectangle must be inside
	if ( IsInside( startx, topy )==false ||
		 IsInside( endx, endy ) == false )
		 return false;

	// first crop to bounding rectangle
	CxImage tmp(*this, true, false, true);
	// tmp.Copy(*this, true, false, true);
	if (!tmp.IsValid()){
		strcpy(info.szLastError,tmp.GetLastError());
		return false;
	}
    if (!tmp.Crop( startx, topy, endx, endy)){
		strcpy(info.szLastError,tmp.GetLastError());
		return false;
	}
	
	// the midpoint of the image now became the same as the midpoint of the rectangle
	// rotate new image with minus angle amount
    if ( false == tmp.Rotate( (float)(-angle*57.295779513082320877) ) ) // Rotate expects angle in degrees
		return false;

	// crop rotated image to the original selection rectangle
    endx   = (tmp.head.biWidth+width)/2;
	startx = (tmp.head.biWidth-width)/2;
	starty = (tmp.head.biHeight+height)/2;
    endy   = (tmp.head.biHeight-height)/2;
    if ( false == tmp.Crop( startx, starty, endx, endy ) )
		return false;

	if (iDst) iDst->Transfer(tmp);
	else Transfer(tmp);

	return true;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::Crop(const RECT& rect, CxImage* iDst)
{
	return Crop(rect.left, rect.top, rect.right, rect.bottom, iDst);
}
////////////////////////////////////////////////////////////////////////////////
bool CxImage::Crop(long left, long top, long right, long bottom, CxImage* iDst)
{
	if (!pDib) return false;

	long startx = max(0L,min(left,head.biWidth));
	long endx = max(0L,min(right,head.biWidth));
	long starty = head.biHeight -