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Bug 1811

Summary: SDL_LoadBMP loads 8-bit images incorrectly
Product: SDL Reporter: driedfruit <driedfruit>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: trivial    
Priority: P2 CC: martin.gerhardy
Version: HG 2.0   
Hardware: x86   
OS: Linux   
Attachments: patch to fix the issue

Description driedfruit 2013-04-18 05:30:10 UTC 
Created attachment 1115 [details]
patch to fix the issue

Since the change to SDL_Color to allow the alpha component, SDL_LoadBMP_RW handles alpha for 8-bit palletized images incorrectly.

4th byte in the RGBQUAD structure is always zero, not the alpha.

As seen here
 http://msdn.microsoft.com/en-us/library/windows/desktop/dd162938(v=vs.85).aspx
or here 
 http://msdn.microsoft.com/en-us/library/aa922960.aspx

Note: there might be similar problems in other image formats in SDL_image.
Comment 1 Martin Gerhardy 2013-04-18 07:10:32 UTC 
isn't this obsolete since http://hg.libsdl.org/SDL/rev/1fa727447de3 ?
Comment 2 driedfruit 2013-04-18 07:26:01 UTC 
Oh, absolutely. Terribly sorry for not noticing that.