Dynamic Bitmap Display

This is a discussion on Dynamic Bitmap Display within the Windows Programming forums, part of the Platform Specific Boards category; Code: BITMAP CustomBMP; HBITMAP hCustomBMP; BITMAPINFO CustomBMPInfo; BYTE BitmapData[16]; RGBQUAD* Palette; Code: case WM_CREATE: { Palette = malloc(16); Palette[0].rgbRed = ...

  1. #1
    Work in Progress..... Jaken Veina's Avatar
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    Dynamic Bitmap Display

    Code:
    BITMAP CustomBMP;
    HBITMAP hCustomBMP;
    BITMAPINFO CustomBMPInfo;
    BYTE BitmapData[16];
    RGBQUAD* Palette;
    Code:
        case WM_CREATE:
         {
          Palette = malloc(16);
          Palette[0].rgbRed    = 0;
          Palette[0].rgbGreen  = 0;
          Palette[0].rgbBlue   = 0;
          Palette[1].rgbRed    = 255;
          Palette[1].rgbGreen  = 0;
          Palette[1].rgbBlue   = 0;
          Palette[2].rgbRed    = 0;
          Palette[2].rgbGreen  = 255;
          Palette[2].rgbBlue   = 0;
          Palette[3].rgbRed    = 0;
          Palette[3].rgbGreen  = 0;
          Palette[3].rgbBlue   = 255;
          Palette[4].rgbRed    = 255;
          Palette[4].rgbGreen  = 255;
          Palette[4].rgbBlue   = 0;
          Palette[5].rgbRed    = 255;
          Palette[5].rgbGreen  = 0;
          Palette[5].rgbBlue   = 255;
          Palette[6].rgbRed    = 0;
          Palette[6].rgbGreen  = 255;
          Palette[6].rgbBlue   = 255;
          Palette[7].rgbRed    = 128;
          Palette[7].rgbGreen  = 0;
          Palette[7].rgbBlue   = 0;
          Palette[8].rgbRed    = 0;
          Palette[8].rgbGreen  = 128;
          Palette[8].rgbBlue   = 0;
          Palette[9].rgbRed    = 0;
          Palette[9].rgbGreen  = 0;
          Palette[9].rgbBlue   = 128;
          Palette[10].rgbRed   = 128;
          Palette[10].rgbGreen = 128;
          Palette[10].rgbBlue  = 0;
          Palette[11].rgbRed   = 128;
          Palette[11].rgbGreen = 0;
          Palette[11].rgbBlue  = 128;
          Palette[12].rgbRed   = 0;
          Palette[12].rgbGreen = 128;
          Palette[12].rgbBlue  = 128;
          Palette[13].rgbRed   = 128;
          Palette[13].rgbGreen = 128;
          Palette[13].rgbBlue  = 128;
          Palette[14].rgbRed   = 255;
          Palette[14].rgbGreen = 255;
          Palette[14].rgbBlue  = 255;
          Palette[15].rgbRed   = 0;
          Palette[15].rgbGreen = 0; 
          Palette[15].rgbBlue  = 0;
    
          BitmapData[0] =  0x01;
          BitmapData[1] =  0x23;
          BitmapData[2] =  0x45;
          BitmapData[3] =  0x67;
          BitmapData[4] =  0x89;
          BitmapData[5] =  0xAB;
          BitmapData[6] =  0xCD;
          BitmapData[7] =  0xEF;
          BitmapData[8] =  0x01;
          BitmapData[9] =  0x23;
          BitmapData[10] = 0x45;
          BitmapData[11] = 0x67;
          BitmapData[12] = 0x89;
          BitmapData[13] = 0xAB;
          BitmapData[14] = 0xCD;
          BitmapData[15] = 0xEF;
    
          CustomBMPInfo.bmiHeader.biSize = 40; 
          CustomBMPInfo.bmiHeader.biWidth = 16; 
          CustomBMPInfo.bmiHeader.biHeight = 2; 
          CustomBMPInfo.bmiHeader.biPlanes = 1; 
          CustomBMPInfo.bmiHeader.biBitCount = 4; 
          CustomBMPInfo.bmiHeader.biCompression = 0; 
          CustomBMPInfo.bmiHeader.biSizeImage = 0; 
          CustomBMPInfo.bmiHeader.biXPelsPerMeter = 0; 
          CustomBMPInfo.bmiHeader.biYPelsPerMeter = 0; 
          CustomBMPInfo.bmiHeader.biClrUsed = 16; 
          CustomBMPInfo.bmiHeader.biClrImportant = 0;
          CustomBMPInfo.bmiColors = Palette;
         }
        break;
        case WM_PAINT:
         {
          PAINTSTRUCT ps;
    
          HDC hdc = BeginPaint(hwnd, &ps);
    
          hCustomBMP = CreateCompatibleBitmap(hdc,
                                              CustomBMPInfo.bmiHeader.biWidth,
                                              CustomBMPInfo.bmiHeader.biHeight);
          GetObject(hCustomBMP, sizeof(CustomBMP), &CustomBMP);
          SetDIBits(hdc, hCustomBMP, 0, CustomBMP.bmHeight, BitmapData, &CustomBMPInfo, DIB_RGB_COLORS);
    
          HDC hdcMem = CreateCompatibleDC(hdc);
          HBITMAP hbmOld = SelectObject(hdcMem, hCustomBMP);
    
          BitBlt(hdc, 0, 0, CustomBMP.bmWidth, CustomBMP.bmHeight, hdcMem, 0, 0, SRCCOPY);
    
          SelectObject(hdcMem, hbmOld);
          DeleteDC(hdcMem);
          DeleteObject(hCustomBMP);
    
          EndPaint(hwnd, &ps);
         }
        break;
        case WM_CLOSE:
         {
          free(Palette);
          DestroyWindow(hwnd);
         }
        break;
    I'm having problems trying to understand the SetDIBits, with a paletted bitmap, rather than a raw bitmap. I attached an image of the output, zoomed in by 800%, as well as an image of the output I was aiming for. Any ideas what I'm doing wrong?
    Attached Images Attached Images   
    Code:
    void function(void)
     {
      function();
     }

  2. #2
    Registered User
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    Code:
    Palette = malloc(sizeof(RGBQUAD) * 16);
    "...the results are undefined, and we all know what "undefined" means: it means it works during development, it works during testing, and it blows up in your most important customers' faces." --Scott Meyers

  3. #3
    Work in Progress..... Jaken Veina's Avatar
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    Ahh. Thank you. That doesn't seem to be my problem, though. The output is the same.
    Code:
    void function(void)
     {
      function();
     }

  4. #4
    train spotter
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    Your params are wrong.

    ie CustomBMPInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

    Have a look here...
    displaying bitmap
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
    Friedrich Nietzsche

    "I spent a lot of my money on booze, birds and fast cars......the rest I squandered."
    George Best

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    Winston Churchill

  5. #5
    Yes, my avatar is stolen anonytmouse's Avatar
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    Code:
          CustomBMPInfo.bmiColors = Palette;
    This should not compile. The BITMAPINFO structure has the following definition:
    Code:
    typedef struct tagBITMAPINFO { 
      BITMAPINFOHEADER bmiHeader; 
      RGBQUAD          bmiColors[1]; 
    } BITMAPINFO, *PBITMAPINFO;
    The bmiColors member is an array, and therefore can not be assigned to. BITMAPINFO consists of an BITMAPINFOHEADER followed by a variable sized array of palette entries. It is not a BITMAPINFOHEADER followed by a pointer to an array of palette entries, which your code attempts to create. Because the array may be of various sizes, it is defined with the placeholder size of 1, and the programmer is expected to allocate appropriate memory. This pattern is not uncommon in the Windows API.

    I have modified your code to demonstrate:
    Code:
    #include <windows.h>
    #include <stdio.h>
    
    #if defined(_MSC_VER)
    #pragma comment(lib, "gdi32.lib")
    #endif
    
    int main(void)
    {
    
          BITMAP      CustomBMP;
          HBITMAP     hCustomBMP;
          BYTE        BitmapData[16];
          BITMAPINFO* CustomBMPInfo;
          RGBQUAD*    Palette;
    
          /* Allocate space for a BITMAPINFO structure followed by an array of RGBQUADs */
          CustomBMPInfo = (BITMAPINFO*) malloc(sizeof(BITMAPINFO) + (sizeof(RGBQUAD) * 16));
          /* TODO: check malloc. */
    
          /* Convenience variable. We could use CustomBMPInfo->bmiColors directly. */
          Palette = CustomBMPInfo->bmiColors;
    
          Palette[0].rgbRed    = 0;
          Palette[0].rgbGreen  = 0;
          Palette[0].rgbBlue   = 0;
          Palette[1].rgbRed    = 255;
          Palette[1].rgbGreen  = 0;
          Palette[1].rgbBlue   = 0;
          Palette[2].rgbRed    = 0;
          Palette[2].rgbGreen  = 255;
          Palette[2].rgbBlue   = 0;
          Palette[3].rgbRed    = 0;
          Palette[3].rgbGreen  = 0;
          Palette[3].rgbBlue   = 255;
          Palette[4].rgbRed    = 255;
          Palette[4].rgbGreen  = 255;
          Palette[4].rgbBlue   = 0;
          Palette[5].rgbRed    = 255;
          Palette[5].rgbGreen  = 0;
          Palette[5].rgbBlue   = 255;
          Palette[6].rgbRed    = 0;
          Palette[6].rgbGreen  = 255;
          Palette[6].rgbBlue   = 255;
          Palette[7].rgbRed    = 128;
          Palette[7].rgbGreen  = 0;
          Palette[7].rgbBlue   = 0;
          Palette[8].rgbRed    = 0;
          Palette[8].rgbGreen  = 128;
          Palette[8].rgbBlue   = 0;
          Palette[9].rgbRed    = 0;
          Palette[9].rgbGreen  = 0;
          Palette[9].rgbBlue   = 128;
          Palette[10].rgbRed   = 128;
          Palette[10].rgbGreen = 128;
          Palette[10].rgbBlue  = 0;
          Palette[11].rgbRed   = 128;
          Palette[11].rgbGreen = 0;
          Palette[11].rgbBlue  = 128;
          Palette[12].rgbRed   = 0;
          Palette[12].rgbGreen = 128;
          Palette[12].rgbBlue  = 128;
          Palette[13].rgbRed   = 128;
          Palette[13].rgbGreen = 128;
          Palette[13].rgbBlue  = 128;
          Palette[14].rgbRed   = 255;
          Palette[14].rgbGreen = 255;
          Palette[14].rgbBlue  = 255;
          Palette[15].rgbRed   = 0;
          Palette[15].rgbGreen = 0; 
          Palette[15].rgbBlue  = 0;
    
          BitmapData[0] =  0x01;
          BitmapData[1] =  0x23;
          BitmapData[2] =  0x45;
          BitmapData[3] =  0x67;
          BitmapData[4] =  0x89;
          BitmapData[5] =  0xAB;
          BitmapData[6] =  0xCD;
          BitmapData[7] =  0xEF;
          BitmapData[8] =  0x01;
          BitmapData[9] =  0x23;
          BitmapData[10] = 0x45;
          BitmapData[11] = 0x67;
          BitmapData[12] = 0x89;
          BitmapData[13] = 0xAB;
          BitmapData[14] = 0xCD;
          BitmapData[15] = 0xEF;
    
          CustomBMPInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER); 
          CustomBMPInfo->bmiHeader.biWidth = 16; 
          CustomBMPInfo->bmiHeader.biHeight = 2; 
          CustomBMPInfo->bmiHeader.biPlanes = 1; 
          CustomBMPInfo->bmiHeader.biBitCount = 4; 
          CustomBMPInfo->bmiHeader.biCompression = BI_RGB; 
          CustomBMPInfo->bmiHeader.biSizeImage = 0; 
          CustomBMPInfo->bmiHeader.biXPelsPerMeter = 0; 
          CustomBMPInfo->bmiHeader.biYPelsPerMeter = 0; 
          CustomBMPInfo->bmiHeader.biClrUsed = 16; 
          CustomBMPInfo->bmiHeader.biClrImportant = 0;
    
          HDC hdc = GetDC(NULL);
    
          hCustomBMP = CreateCompatibleBitmap(hdc,
                                              CustomBMPInfo->bmiHeader.biWidth,
                                              CustomBMPInfo->bmiHeader.biHeight);
          GetObject(hCustomBMP, sizeof(CustomBMP), &CustomBMP);
          SetDIBits(hdc, hCustomBMP, 0, CustomBMP.bmHeight, BitmapData, CustomBMPInfo, DIB_RGB_COLORS);
    
          HDC hdcMem = CreateCompatibleDC(hdc);
          HBITMAP hbmOld = (HBITMAP) SelectObject(hdcMem, hCustomBMP);
    
          BitBlt(hdc, 0, 0, CustomBMP.bmWidth, CustomBMP.bmHeight, hdcMem, 0, 0, SRCCOPY);
    
          SelectObject(hdcMem, hbmOld);
          DeleteDC(hdcMem);
          DeleteObject(hCustomBMP);
    
          ReleaseDC(NULL, hdc);
    
          getchar();
          return 0;
    }
    Last edited by anonytmouse; 07-03-2005 at 11:18 PM.

  6. #6
    Work in Progress..... Jaken Veina's Avatar
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    I've never seen anyone use that technique for allocation. Although, it does make sense. Thanks a lot. I wish MSDN would be a little clearer on how to use that structure.
    Code:
    void function(void)
     {
      function();
     }

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