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Testing a Printer for JPEG or PNG Support

The SetDIBitsToDevice function uses color data from a DIB to set the pixels in the specified rectangle on the device that is associated with the destination device context.

SetDIBitsToDevice is extended to allow a JPEG or PNG image to be passed as the source image.

For example:



// 
// pvJpgImage points to a buffer containing the JPEG image 
// nJpgImageSize is the size of the buffer 
// ulJpgWidth is the width of the JPEG image 
// ulJpgHeight is the height of the JPEG image 
// 

// 
// Check if CHECKJPEGFORMAT is supported (device has JPEG support) 
// and use it to verify that device can handle the JPEG image. 
// 

ul = CHECKJPEGFORMAT;

if (
    // Check if CHECKJPEGFORMAT exists: 

    (ExtEscape(hdc, QUERYESCSUPPORT,
               sizeof(ul), &ul, 0, 0) > 0) &&

    // Check if CHECKJPEGFORMAT executed without error: 

    (ExtEscape(hdc, CHECKJPEGFORMAT,
               pvJpgImage, nJpgImageSize, sizeof(ul), &ul) > 0) &&

    // Check status code returned by CHECKJPEGFORMAT: 

    (ul == 1)
   )
{
    // 
    // Initialize the BITMAPINFO. 
    // 

    memset(&bmi, 0, sizeof(bmi));
    bmi.bmiHeader.biSize        = sizeof(BITMAPINFOHEADER);
    bmi.bmiHeader.biWidth       = ulJpgWidth;
    bmi.bmiHeader.biHeight      = -ulJpgHeight; // top-down image 
    bmi.bmiHeader.biPlanes      = 1;
    bmi.bmiHeader.biBitCount    = 0;
    bmi.bmiHeader.biCompression = BI_JPEG;
    bmi.bmiHeader.biSizeImage   = nJpgImageSize;

    // 
    // Do the SetDIBitsToDevice. 
    // 

    iRet = SetDIBitsToDevice(hdc,
                             ulDstX, ulDstY,
                             ulDstWidth, ulDstHeight,
                             0, 0,
                             0, ulJpgHeight,
                             pvJpgImage,
                             &bmi,
                             DIB_RGB_COLORS);

    if (iRet == GDI_ERROR)
        return FALSE;
}
else
{
    // 
    // Decompress image into a DIB and call SetDIBitsToDevice  
    // with the DIB instead. 
    // 
}


 

 

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