Problem drawing bitmaps with alphachannel

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   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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andolo Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 16 November 2005 Status: Offline Points: 13	Post Options Post Reply Quote andolo Report Post Thanks(0) Quote Reply Topic: Problem drawing bitmaps with alphachannel 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());