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Hi
I have transparent GIF's which I need to print.

I am using TransparentBlt.

It works OK with print preview, but when I print to printer or to Adobe, the transparent images are not printed.

I tried StretchBlt and BitBlt also, but my transparency is lost.

Even Aplhablend is not working.

Please suggest some alternate methods to do so.

Regards
Posted
Updated 29-Sep-14 4:02am

1 solution

See the final paragraph of the Remarks section in http://msdn.microsoft.com/en-us/library/windows/desktop/dd145141(v=vs.85).aspx[^].
 
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Rajeev Raina 29-Sep-14 9:14am    
Dear Richard

Thanks for your reply. Do you have a working example of the same? As advised I looked at the final paragraph. What I understand is that I need to use
1. GetDIBits and
2. SetDIBits

I tried it but seems I have not fully understood its use.

I am pasting (relevant) lines of my code and please see if you can add these two functions to my code at the approporiate place so that I can make it work.



//------ CDC& dc -- Passed here into my function

dc.SetStretchBltMode(HALFTONE);
dc.SetBrushOrg(0, 0);
.....

/// CImage m_Image ---> Declared at some other place

LONG nTransparent = m_Image.GetTransparentColor();
HDC hDC = m_Image.GetDC();
::GetDIBColorTable(hDC, nTransparent, 1, &rgb);
if (nTransparent != -1)
{
void *ptr = m_Image.GetBits();
BOOL bRes = ::TransparentBlt(dc, xDest, yDest, nDestWidth, nDestHeight, hDC, xSrc, ySrc, nSrcWidth, nSrcHeight,RGB(rgb.rgbRed, rgb.rgbGreen, rgb.rgbBlue));
TRACE("Result = %d\n", bRes);
}
else
{
::StretchBlt(dc, xDest, yDest, nDestWidth, nDestHeight, hDC, xSrc, ySrc, nSrcWidth, nSrcHeight, DSTINVERT);
}
m_Image.ReleaseDC();

You help will be highly appreciated.
Richard MacCutchan 29-Sep-14 11:21am    
Sorry but I have not tried this myself, so I have no sample code.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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