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POwin32 bitmaps flashing when more than one sprite on screen
 

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  1. POwin32 bitmaps flashing when more than one sprite on screen
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    <p>I've been using the win32 api to make a game with sprites. For some reason when I have more than one sprite on screen they flash occasionally as if they are disappearing and returning. When there is only one sprite on screen it displays correctly.</p> <p>I am using C++, win32 API and working with Visual Studio 08</p> <p>The following is roughly what I have:</p> <pre><code>//creates rect based on window client area GetClientRect(ghwnd, &amp;screenRect); // Initialises front buffer device context (window) frontHDC = GetDC(ghwnd); // sets up Back DC to be compatible with the front backHDC = CreateCompatibleDC(frontHDC); // Create another hdc to store the bitmap in before the backbuffer bitmapHDC = CreateCompatibleDC(frontHDC); //creates bitmap compatible with the front buffer theOldFrontBitMap = CreateCompatibleBitmap(frontHDC, screenRect.right, screenRect.bottom); //creates bitmap compatible with the back buffer theOldBackBitMap = (HBITMAP)SelectObject(backHDC, theOldFrontBitMap); HBITMAP originalBitMap = (HBITMAP)SelectObject(bitmapHDC,bitmap); //Transparency function TransparentBlt( backHDC, m_Position.x, m_Position.y, m_Size.x, m_Size.y, bitmapHDC, 0, 0, m_Size.x, m_Size.y, 0x00FFFFFF); SelectObject(bitmapHDC,originalBitMap); BitBlt(frontHDC, screenRect.left, screenRect.top, screenRect.right, screenRect.bottom, backHDC, 0, 0, SRCCOPY); </code></pre> <p>Am I doing this correctly? and if so where am I going wrong? If I have not given enough information please tell me and I will rectify that.</p>
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