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POHow to Convert a gdi+ Bitmap-like struct into an HDC?
 

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  1. POHow to Convert a gdi+ Bitmap-like struct into an HDC?
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    <p>How to Convert a Bitmap-like struct into an HDC?</p> <p>I am now writting image processing program in c++, gdi.</p> <p>If I got a HDC. I can draw whatever I like on the HDC in gdi by the following code.</p> <pre><code>// HDC is handy. HDC dc; dc.DrawXXX // I can draw using gdi method. Graphics gr(dc); // now I can also draw on the dc using gdi+ method. </code></pre> <p>My Application is based on FreeImage. I make of fipImage. ( use data struct like Bitmap )</p> <p>However if I want to draw on fipWinImage, now I have to copy fipWinImageto Bitmap, then draw on the Bitmap, and finally convert the bitmap into fipImage again, which is time comsuming and memory comsuming.</p> <p>Convert fipImage to Bitmap -> Draw on the bitmap -> convert bitmap to fipWinImage</p> <pre><code>fipWinImage imagefip; Bitmap* tempImg = new Bitmap(imagefip-&gt;GetWidth(), imagefip.GetHeigt(), PixelFormat24bppRGB); // memory comsuming is image is large Graphics *pGr = Graphics::FromImage(tempImg); HDC dc = pGr-&gt;GetHDC(); RECT rec; rec.left = 0; rec.top = 0; rec.right = imagefip.GetWidth(); rec.bottom = imagefip.GetHeight(); fipImage.draw(dc, rec); // using stretchdibits() pGr-&gt;ReleaseHDC(dc); Graphics gr(tempImg); HDC dc = gr.GetHDC(); // Get an Hdc, draw using gdi method gr.ReleaseHDC(tempDC); // gr.drawXXX // Draw using gdi+ method. fipWinImage fipImg; // final result fipWinImage. HBITMAP temp; Color color; tempImg-&gt;GetHBITMAP(color, &amp;temp); fipImg-&gt;copyFromBitmap(temp); </code></pre> <p>I want to construct a HDC directly from fipImage. and draw directly on fipWinImage How can I do this?</p>
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