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Forum LockedProblem drawing bitmaps with alphachannel

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andolo View Drop Down
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Joined: 16 November 2005
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    Posted: 27 November 2009 at 10:11am
Hi,

the following problem:

Drawing an image with semi-transparency (using alpha32 bitmaps / png) f.E. from the Styles works fine.
Now i am changing some pixels to RGB values bigger than 0x80.

(f.E. COLOUR1 0x14001E is ok,  COLOUR2 RGB 0xFFCC00 shows wrong colour and no alpha, both with 30% alpha )
The stripe behind the text:  purple colour is ok on the left   right side colour should be a light pink an transparent

I can't properly draw an image containing pixels of COLOUR2 independent of the alpha channel.


remark: using the same image with CImageList::Draw works fine! Problem: I am unable to change the output size.


Am i using the wrong functions?  i use the following code:


// xtptoolkit 13.x
// class inherited from CXTPRibbonTheme -> calling CXTPOffice2007Theme::LoadImage


CXTPOffice2007Image* pImage = CXTPRibbonTheme::LoadImage(_T("RIBBONTABBACKGROUNDDWM"));         
pImage->DrawImage(pDC, rcDest, pImage->GetSource());
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