bool CxImageICO::Decode(CxFile *hFile)
{
	if (hFile==NULL) return false;

	uint32_t off = hFile->Tell(); //<yuandi>
	int32_t	page=info.nFrame;	//internal icon structure indexes

	// read the first part of the header
	ICONHEADER icon_header;
	hFile->Read(&icon_header,sizeof(ICONHEADER),1);

	icon_header.idType = m_ntohs(icon_header.idType);
	icon_header.idCount = m_ntohs(icon_header.idCount);

	// check if it's an icon or a cursor
	if ((icon_header.idReserved == 0) && ((icon_header.idType == 1)||(icon_header.idType == 2))) {

		info.nNumFrames = icon_header.idCount;

		// load the icon descriptions
		ICONDIRENTRY *icon_list = (ICONDIRENTRY *)malloc(icon_header.idCount * sizeof(ICONDIRENTRY));
		int32_t c;
		for (c = 0; c < icon_header.idCount; c++) {
			hFile->Read(icon_list + c, sizeof(ICONDIRENTRY), 1);

			icon_list[c].wPlanes = m_ntohs(icon_list[c].wPlanes);
			icon_list[c].wBitCount = m_ntohs(icon_list[c].wBitCount);
			icon_list[c].dwBytesInRes = m_ntohl(icon_list[c].dwBytesInRes);
			icon_list[c].dwImageOffset = m_ntohl(icon_list[c].dwImageOffset);
		}

		if ((page>=0)&&(page<icon_header.idCount)){

			if (info.nEscape == -1) {
				// Return output dimensions only
				head.biWidth = icon_list[page].bWidth;
				head.biHeight = icon_list[page].bHeight;
#if CXIMAGE_SUPPORT_PNG
				if (head.biWidth==0 && head.biHeight==0)
				{	// Vista icon support
					hFile->Seek(off + icon_list[page].dwImageOffset, SEEK_SET);
					CxImage png;
					png.SetEscape(-1);
					if (png.Decode(hFile,CXIMAGE_FORMAT_PNG)){
						Transfer(png);
						info.nNumFrames = icon_header.idCount;
					}
				}
#endif //CXIMAGE_SUPPORT_PNG
				free(icon_list);
				info.dwType = CXIMAGE_FORMAT_ICO;
				return true;
			}

			// get the bit count for the colors in the icon <CoreyRLucier>
			BITMAPINFOHEADER bih;
			hFile->Seek(off + icon_list[page].dwImageOffset, SEEK_SET);

			if (icon_list[page].bWidth==0 && icon_list[page].bHeight==0)
			{	// Vista icon support
#if CXIMAGE_SUPPORT_PNG
				CxImage png;
				if (png.Decode(hFile,CXIMAGE_FORMAT_PNG)){
					Transfer(png);
					info.nNumFrames = icon_header.idCount;
				}
				SetType(CXIMAGE_FORMAT_ICO);
#endif //CXIMAGE_SUPPORT_PNG
			}
			else
			{	// standard icon
				hFile->Read(&bih,sizeof(BITMAPINFOHEADER),1);

				bihtoh(&bih);

				c = bih.biBitCount;

				// allocate memory for one icon
				Create(icon_list[page].bWidth,icon_list[page].bHeight, c, CXIMAGE_FORMAT_ICO);	//image creation

				// read the palette
				RGBQUAD pal[256];
				if (bih.biClrUsed)
                {
                    DWORD _count = bih.biClrUsed; if (_count > 256) _count = 256;
                    hFile->Read(pal,_count*sizeof(RGBQUAD), 1);
                }
				else
                {
                    DWORD _count = head.biClrUsed; if (_count > 256) _count = 256;
                    hFile->Read(pal,_count*sizeof(RGBQUAD), 1);
                }

				SetPalette(pal,head.biClrUsed);	//palette assign

				//read the icon
				if (c<=24){
					hFile->Read(info.pImage, head.biSizeImage, 1);
				} else { // 32 bit icon
					uint8_t* buf=(uint8_t*)malloc(4*head.biHeight*head.biWidth);
					uint8_t* src = buf;
					hFile->Read(buf, 4*head.biHeight*head.biWidth, 1);
#if CXIMAGE_SUPPORT_ALPHA
					if (!AlphaIsValid()) AlphaCreate();
#endif //CXIMAGE_SUPPORT_ALPHA
					for (int32_t y = 0; y < head.biHeight; y++) {
						uint8_t* dst = GetBits(y);
						for(int32_t x=0;x<head.biWidth;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;
						}
					}
					free(buf);
				}
				// apply the AND and XOR masks
				int32_t maskwdt = ((head.biWidth+31) / 32) * 4;	//line width of AND mask (always 1 Bpp)
				int32_t masksize = head.biHeight * maskwdt;				//size of mask
				uint8_t *mask = (uint8_t *)malloc(masksize);
				if (hFile->Read(mask, masksize, 1)){

					bool bGoodMask=false;
					for (int32_t im=0;im<masksize;im++){
						if (mask[im]!=255){
							bGoodMask=true;
							break;
						}
					}

					if (bGoodMask){
						int32_t x,y;
#if CXIMAGE_SUPPORT_ALPHA
						bool bNeedAlpha = false;
						if (!AlphaIsValid()){
							AlphaCreate();
						} else { 
							bNeedAlpha=true; //32bit icon
						}
						for (y = 0; y < head.biHeight; y++) {
							for (x = 0; x < head.biWidth; x++) {
								if (((mask[y*maskwdt+(x>>3)]>>(7-x%8))&0x01)){
									AlphaSet(x,y,0);
									bNeedAlpha=true;
								}
							}
						}
						if (!bNeedAlpha) AlphaDelete();
#endif //CXIMAGE_SUPPORT_ALPHA

						//check if there is only one transparent color
						RGBQUAD cc,ct;
						int32_t nTransColors=0;
						int32_t nTransIndex=0;
						for (y = 0; y < head.biHeight; y++){
							for (x = 0; x < head.biWidth; x++){
								if (((mask[y*maskwdt+(x>>3)] >> (7-x%8)) & 0x01)){
									cc = GetPixelColor(x,y,false);
									if (nTransColors==0){
										nTransIndex = GetPixelIndex(x,y);
										nTransColors++;
										ct = cc;
									} else {
										if (memcmp(&cc, &ct, sizeof(RGBQUAD)) != 0){
											nTransColors++;
										}
									}
								}
							}
						}
						if (nTransColors==1 && c<=8){
							SetTransColor(ct);
							SetTransIndex(nTransIndex);
#if CXIMAGE_SUPPORT_ALPHA
							AlphaDelete(); //because we have a unique transparent color in the image
#endif //CXIMAGE_SUPPORT_ALPHA
						}

						// <vho> - Transparency support w/o Alpha support
						if (c <= 8){ // only for icons with less than 256 colors (XP icons need alpha).
							  
							// find a color index, which is not used in the image
							// it is almost sure to find one, bcs. nobody uses all possible colors for an icon

							uint8_t colorsUsed[256];
							memset(colorsUsed, 0, sizeof(colorsUsed));

							for (y = 0; y < head.biHeight; y++){
								for (x = 0; x < head.biWidth; x++){
									colorsUsed[BlindGetPixelIndex(x,y)] = 1;
								}
							}

							int32_t iTransIdx = -1;
							for (x = (int32_t)(head.biClrUsed-1); x>=0 ; x--){
								if (colorsUsed[x] == 0){
									iTransIdx = x; // this one is not in use. we may use it as transparent color
									break;
								}
							}

							// Go thru image and set unused color as transparent index if needed
							if (iTransIdx >= 0){
								bool bNeedTrans = false;
								for (y = 0; y < head.biHeight; y++){
									for (x = 0; x < head.biWidth; x++){
										// AND mask (Each Byte represents 8 Pixels)
										if (((mask[y*maskwdt+(x>>3)] >> (7-x%8)) & 0x01)){
											// AND mask is set (!=0). This is a transparent part
											SetPixelIndex(x, y, (uint8_t)iTransIdx);
											bNeedTrans = true;
										}
									}
								}
								// set transparent index if needed
								if (bNeedTrans)	SetTransIndex(iTransIdx);
#if CXIMAGE_SUPPORT_ALPHA
								AlphaDelete(); //because we have a transparent color in the palette
#endif //CXIMAGE_SUPPORT_ALPHA
							}
						}
					} else {
						SetTransIndex(0); //empty mask, set black as transparent color
						Negative();
					}
				} 
				free(mask);
			}
			free(icon_list);
			// icon has been loaded successfully!
			return true;
		}
		free(icon_list);
	}
	return false;
}

bool CxImageICO::Decode(CxFile *hFile)
{
	if (hFile==NULL) return false;

	uint32_t off = hFile->Tell();  
	int32_t	page=info.nFrame;	 

	 
	ICONHEADER icon_header;
	hFile->Read(&icon_header,sizeof(ICONHEADER),1);

	icon_header.idType = m_ntohs(icon_header.idType);
	icon_header.idCount = m_ntohs(icon_header.idCount);

	 
	if ((icon_header.idReserved == 0) && ((icon_header.idType == 1)||(icon_header.idType == 2))) {

		info.nNumFrames = icon_header.idCount;

		 
		ICONDIRENTRY *icon_list = (ICONDIRENTRY *)malloc(icon_header.idCount * sizeof(ICONDIRENTRY));
		int32_t c;
		for (c = 0; c < icon_header.idCount; c++) {
			hFile->Read(icon_list + c, sizeof(ICONDIRENTRY), 1);

			icon_list[c].wPlanes = m_ntohs(icon_list[c].wPlanes);
			icon_list[c].wBitCount = m_ntohs(icon_list[c].wBitCount);
			icon_list[c].dwBytesInRes = m_ntohl(icon_list[c].dwBytesInRes);
			icon_list[c].dwImageOffset = m_ntohl(icon_list[c].dwImageOffset);
		}

		if ((page>=0)&&(page<icon_header.idCount)){

			if (info.nEscape == -1) {
				 
				head.biWidth = icon_list[page].bWidth;
				head.biHeight = icon_list[page].bHeight;
#if CXIMAGE_SUPPORT_PNG
				if (head.biWidth==0 && head.biHeight==0)
				{	 
					hFile->Seek(off + icon_list[page].dwImageOffset, SEEK_SET);
					CxImage png;
					png.SetEscape(-1);
					if (png.Decode(hFile,CXIMAGE_FORMAT_PNG)){
						Transfer(png);
						info.nNumFrames = icon_header.idCount;
					}
				}
#endif  
				free(icon_list);
				info.dwType = CXIMAGE_FORMAT_ICO;
				return true;
			}

			 
			BITMAPINFOHEADER bih;
			hFile->Seek(off + icon_list[page].dwImageOffset, SEEK_SET);

			if (icon_list[page].bWidth==0 && icon_list[page].bHeight==0)
			{	 
#if CXIMAGE_SUPPORT_PNG
				CxImage png;
				if (png.Decode(hFile,CXIMAGE_FORMAT_PNG)){
					Transfer(png);
					info.nNumFrames = icon_header.idCount;
				}
				SetType(CXIMAGE_FORMAT_ICO);
#endif  
			}
			else
			{	 
				hFile->Read(&bih,sizeof(BITMAPINFOHEADER),1);

				bihtoh(&bih);

				c = bih.biBitCount;

				 
				Create(icon_list[page].bWidth,icon_list[page].bHeight, c, CXIMAGE_FORMAT_ICO);	 

				 
				RGBQUAD pal[256];
				if (bih.biClrUsed)
                {
                    DWORD _count = bih.biClrUsed; if (_count > 256) _count = 256;
                    hFile->Read(pal,_count*sizeof(RGBQUAD), 1);
                }
				else
                {
                    DWORD _count = head.biClrUsed; if (_count > 256) _count = 256;
                    hFile->Read(pal,_count*sizeof(RGBQUAD), 1);
                }

				SetPalette(pal,head.biClrUsed);	 

				 
				if (c<=24){
					hFile->Read(info.pImage, head.biSizeImage, 1);
				} else {  
					uint8_t* buf=(uint8_t*)malloc(4*head.biHeight*head.biWidth);
					uint8_t* src = buf;
					hFile->Read(buf, 4*head.biHeight*head.biWidth, 1);
#if CXIMAGE_SUPPORT_ALPHA
					if (!AlphaIsValid()) AlphaCreate();
#endif  
					for (int32_t y = 0; y < head.biHeight; y++) {
						uint8_t* dst = GetBits(y);
						for(int32_t x=0;x<head.biWidth;x++){
							*dst++=src[0];
							*dst++=src[1];
							*dst++=src[2];
#if CXIMAGE_SUPPORT_ALPHA
							AlphaSet(x,y,src[3]);
#endif  
							src+=4;
						}
					}
					free(buf);
				}
				 
				int32_t maskwdt = ((head.biWidth+31) / 32) * 4;	 
				int32_t masksize = head.biHeight * maskwdt;				 
				uint8_t *mask = (uint8_t *)malloc(masksize);
				if (hFile->Read(mask, masksize, 1)){

					bool bGoodMask=false;
					for (int32_t im=0;im<masksize;im++){
						if (mask[im]!=255){
							bGoodMask=true;
							break;
						}
					}

					if (bGoodMask){
						int32_t x,y;
#if CXIMAGE_SUPPORT_ALPHA
						bool bNeedAlpha = false;
						if (!AlphaIsValid()){
							AlphaCreate();
						} else { 
							bNeedAlpha=true;  
						}
						for (y = 0; y < head.biHeight; y++) {
							for (x = 0; x < head.biWidth; x++) {
								if (((mask[y*maskwdt+(x>>3)]>>(7-x%8))&0x01)){
									AlphaSet(x,y,0);
									bNeedAlpha=true;
								}
							}
						}
						if (!bNeedAlpha) AlphaDelete();
#endif  

						 
						RGBQUAD cc,ct;
						int32_t nTransColors=0;
						int32_t nTransIndex=0;
						for (y = 0; y < head.biHeight; y++){
							for (x = 0; x < head.biWidth; x++){
								if (((mask[y*maskwdt+(x>>3)] >> (7-x%8)) & 0x01)){
									cc = GetPixelColor(x,y,false);
									if (nTransColors==0){
										nTransIndex = GetPixelIndex(x,y);
										nTransColors++;
										ct = cc;
									} else {
										if (memcmp(&cc, &ct, sizeof(RGBQUAD)) != 0){
											nTransColors++;
										}
									}
								}
							}
						}
						if (nTransColors==1 && c<=8){
							SetTransColor(ct);
							SetTransIndex(nTransIndex);
#if CXIMAGE_SUPPORT_ALPHA
							AlphaDelete();  
#endif  
						}

						 
						if (c <= 8){  
							  
							 
							 

							uint8_t colorsUsed[256];
							memset(colorsUsed, 0, sizeof(colorsUsed));

							for (y = 0; y < head.biHeight; y++){
								for (x = 0; x < head.biWidth; x++){
									colorsUsed[BlindGetPixelIndex(x,y)] = 1;
								}
							}

							int32_t iTransIdx = -1;
							for (x = (int32_t)(head.biClrUsed-1); x>=0 ; x--){
								if (colorsUsed[x] == 0){
									iTransIdx = x;  
									break;
								}
							}

							 
							if (iTransIdx >= 0){
								bool bNeedTrans = false;
								for (y = 0; y < head.biHeight; y++){
									for (x = 0; x < head.biWidth; x++){
										 
										if (((mask[y*maskwdt+(x>>3)] >> (7-x%8)) & 0x01)){
											 
											SetPixelIndex(x, y, (uint8_t)iTransIdx);
											bNeedTrans = true;
										}
									}
								}
								 
								if (bNeedTrans)	SetTransIndex(iTransIdx);
#if CXIMAGE_SUPPORT_ALPHA
								AlphaDelete();  
#endif  
							}
						}
					} else {
						SetTransIndex(0);  
						Negative();
					}
				} 
				free(mask);
			}
			free(icon_list);
			 
			return true;
		}
		free(icon_list);
	}
	return false;
}
