[wx-dev] #9741: wxIcon doesn't load transparent icons correctly

[wxTrac]

Ticket URL: <http://trac.wxwidgets.org/ticket/9741>

#9741: wxIcon doesn't load transparent icons correctly
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 Reporter:  kevinw                         |       Owner:         
     Type:  defect                         |      Status:  new    
 Priority:  normal                         |   Milestone:         
Component:  GUI-all                        |     Version:  2.8-svn
 Keywords:  wxIcon, transparency, favicon  |   Blockedby:         
    Patch:  1                              |    Blocking:         
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 The ICO format can specify 32 bits per pixel, but wxBMPHandler::DoLoadDib
 ignores the 4th channel. Here's an example of an icon that fails:

 http://www.google.com/favicon.ico

 If you load this with wxIcon, convert to a wxBitmap, and show it on
 screen, you'll see a black area at the bottom of the image where a
 transparent grey should be.

 The attached patch makes the DoLoadDib function call wxImage::SetAlpha if
 bpp is 32, and causes the favicon to show correctly.


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Ticket URL: <http://trac.wxwidgets.org/ticket/9741>