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Bug 2977

Summary: SDL_ISPIXELFORMAT_ALPHA returns 1 for SDL_PIXELFORMAT_BGR24
Product: SDL Reporter: Lenard Lindstrom <len-l>
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: icculus
Version: 2.0.2   
Hardware: x86   
OS: Linux   
Attachments: Shows SDL_ISPIXELFORMAT_ALPHA value for two 24 bit pixel formats

Description Lenard Lindstrom 2015-05-06 00:09:24 UTC 
Created attachment 2150 [details]
Shows SDL_ISPIXELFORMAT_ALPHA value for two 24 bit pixel formats

The SDL_PixelFormatEnum value SDL_PIXELFORMAT_BGR24 is expected to not have per-pixel alpha. Yet the SDL_ISPIXELFORMAT_ALPHA test is true, while it is false for SDL_PIXELFORMAT_RGB24. Attached is a program which shows the inconsistency, along with the situation where the anomaly was discovered.
Comment 1 Ryan C. Gordon 2015-05-31 05:45:54 UTC 
This is fixed now in https://hg.libsdl.org/SDL/rev/ad9917a91c06, thanks!

--ryan.