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Bug 755

Summary: SDL_DisplayFormatAlpha() crashes
Product: SDL Reporter: Sjors Gielen <dazjorz>
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED INVALID QA Contact: Sam Lantinga <slouken>
Severity: major    
Priority: P2    
Version: 1.2.13   
Hardware: x86   
OS: Linux   
Attachments: Testcase
Sample file with which this bug occurs

Description Sjors Gielen 2009-06-15 15:36:17 UTC 
I am using SDL_DisplayFormatAlpha() on a surface just previously loaded from a BMP file. I will attach the test case and the BMP image I am using. It is 8 bpp. What I was trying to do in my main application, was set the alpha color key to 0, because that's the color of the "background" which I want transparent. Then I called SDL_DisplayFormatAlpha to get a nice 32-bpp image with alpha value which I could use to blit over my screen.
However, I noticed SDL_DisplayFormatAlpha kept crashing so I wrote a test case. The segfault has been confirmed by two other people.
Comment 1 Sjors Gielen 2009-06-15 15:38:49 UTC 
Created attachment 330 [details]
Testcase
Comment 2 Sjors Gielen 2009-06-15 15:39:23 UTC 
Created attachment 331 [details]
Sample file with which this bug occurs
Comment 3 Sjors Gielen 2009-06-15 16:13:03 UTC 
Oops, this is caused by not calling SDL_SetVideoMode(). Added a note on this to the docwiki so it doesn't bite others... http://www.libsdl.org/cgi/docwiki.cgi/SDL_DisplayFormatAlpha