http://forum.codejock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Thu, 09 Apr 2026 21:50:10 +0000 Fri, 27 Nov 2009 10:11:05 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 forum.codejock.com/RSS_post_feed.asp?TID=15736 http://forum.codejock.com/forum_images/codejock-logo.gif http://forum.codejock.com/ http://forum.codejock.com/forum_posts.asp?TID=15736&PID=55227&title=problem-drawing-bitmaps-with-alphachannel#55227 Author: andolo
Subject: 15736
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());]]> Fri, 27 Nov 2009 10:11:05 +0000 http://forum.codejock.com/forum_posts.asp?TID=15736&PID=55227&title=problem-drawing-bitmaps-with-alphachannel#55227