学步园

[参考地址] http://blog.csdn.net/hhygcy/archive/2009/04/29/4138195.aspx

代码测试在WM6模拟器上通过

#include <imaging.h><br /> #include <initguid.h><br /> #include <imgguids.h> </p> <p>HBITMAP CBitmapShowView::LoadPngImage (HDC hdc, LPCTSTR filename)<br /> {<br /> IImagingFactory* pImageFactory = 0;<br /> IImage* pImage = 0;<br /> ImageInfo imageInfo;<br /> CoInitializeEx(0, COINIT_MULTITHREADED);<br /> HBITMAP hBitmap = 0;<br /> LPBYTE lpByte;<br /> if (SUCCEEDED(CoCreateInstance(CLSID_ImagingFactory, 0, CLSCTX_INPROC_SERVER, IID_IImagingFactory, (void**)&pImageFactory)))<br /> {<br /> if (SUCCEEDED(pImageFactory->CreateImageFromFile(filename, &pImage))&& SUCCEEDED(pImage->GetImageInfo(&imageInfo)))<br /> {<br /> HDC bmpDC = CreateCompatibleDC(hdc);<br /> //LPBYTE lpByte;<br /> BITMAPINFO *pbinfo ;<br /> pbinfo = (BITMAPINFO *)calloc(1, sizeof(BITMAPINFO) + 4 * sizeof(INT)) ;<br /> if(!pbinfo)<br /> return FALSE ;<br /> pbinfo->bmiHeader.biSize = sizeof (BITMAPINFOHEADER);<br /> pbinfo->bmiHeader.biWidth = imageInfo.Width ;<br /> pbinfo->bmiHeader.biHeight = imageInfo.Height ;<br /> pbinfo->bmiHeader.biPlanes = 1;<br /> pbinfo->bmiHeader.biBitCount = 32;<br /> pbinfo->bmiHeader.biCompression = BI_ALPHABITFIELDS;<br /> pbinfo->bmiHeader.biSizeImage = 0 ;<br /> pbinfo->bmiHeader.biXPelsPerMeter = 11811;<br /> pbinfo->bmiHeader.biYPelsPerMeter = 11811;<br /> pbinfo->bmiHeader.biClrUsed = 0;<br /> pbinfo->bmiHeader.biClrImportant = 0;<br /> int *pMask = (int*)&(pbinfo->bmiColors[0]) ;<br /> *pMask++ = 0x00FF0000 ;<br /> *pMask++ = 0x0000FF00 ;<br /> *pMask++ = 0x000000FF ;<br /> *pMask++ = 0xFF000000 ;<br /> hBitmap = CreateDIBSection(NULL, pbinfo, DIB_RGB_COLORS, (void **)&lpByte, NULL, 0) ;<br /> free(pbinfo) ;<br /> if(!hBitmap || !lpByte)<br /> return FALSE ;<br /> RECT rect = {0, 0, imageInfo.Width, imageInfo.Height};<br /> IBitmapImage *pBitmapImage;<br /> BitmapData bitmapData;<br /> bitmapData.Width = imageInfo.Width;<br /> bitmapData.Height = imageInfo.Height;<br /> bitmapData.PixelFormat = imageInfo.PixelFormat;<br /> pBitmapImage = NULL;<br /> pImageFactory->CreateBitmapFromImage(pImage, imageInfo.Width, imageInfo.Height, PIXFMT_32BPP_ARGB,<br /> InterpolationHintDefault, &pBitmapImage);<br /> pBitmapImage->LockBits(&rect, ImageLockModeRead,PIXFMT_32BPP_ARGB, &bitmapData);<br /> //transferring the pixels<br /> memcpy(lpByte, bitmapData.Scan0, imageInfo.Width * imageInfo.Height * 4);<br /> pBitmapImage->UnlockBits(&bitmapData);<br /> pBitmapImage->Release();<br /> pImage->Release();<br /> DeleteDC(bmpDC);<br /> }<br /> pImageFactory->Release();<br /> }<br /> CoUninitialize();<br /> //ProcessThePixelsWithAlphaChannel Here<br /> // vertical flip and ProcessThePixelsWithAlphaChannel here<br /> for (UINT y=0; y<imageInfo.Height/2; y++)<br /> {<br /> BYTE * pPixel = (BYTE *) lpByte + imageInfo.Width * 4 * y;<br /> BYTE * pDstPixel = (BYTE*) lpByte + imageInfo.Width * 4 * (imageInfo.Height-y-1);<br /> for (UINT x=0; x<imageInfo.Width; x++)<br /> {<br /> pPixel[0] = pPixel[0] * pPixel[3] / 255;<br /> pPixel[1] = pPixel[1] * pPixel[3] / 255;<br /> pPixel[2] = pPixel[2] * pPixel[3] / 255;<br /> pDstPixel[0] = pDstPixel[0] * pDstPixel[3] / 255;<br /> pDstPixel[1] = pDstPixel[1] * pDstPixel[3] / 255;<br /> pDstPixel[2] = pDstPixel[2] * pDstPixel[3] / 255; </p> <p> INT* pOrigin = (INT*)pPixel;<br /> INT* pDst = (INT*)pDstPixel;<br /> INT temp = *pOrigin;<br /> *pOrigin = *pDst;<br /> *pDst = temp;<br /> pPixel += 4;<br /> pDstPixel += 4;<br /> }<br /> }<br /> return hBitmap;<br /> }</p> <p>// CBitmapShowView 绘制<br /> void CBitmapShowView::OnDraw(CDC* pDC)<br /> {<br /> CBitmapShowDoc* pDoc = GetDocument();<br /> ASSERT_VALID(pDoc);</p> <p> HBITMAP hBitmap = LoadPngImage(pDC->m_hDC, _T("Temp//55.png"));<br /> CBitmap bitmap;<br /> bitmap.Attach(hBitmap);<br /> CDC memDc;<br /> memDc.CreateCompatibleDC(pDC);<br /> memDc.SelectObject(&bitmap);<br /> BLENDFUNCTION pixelblend = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };<br /> ::AlphaBlend(pDC->m_hDC, 10, 10, 200, 200, memDc.m_hDC, 0, 0, 200, 200, pixelblend);<br /> bitmap.DeleteObject();<br /> }