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Bug 3026 - SDL_ConvertSurfaceFormat does not seem to respect color keys
Summary: SDL_ConvertSurfaceFormat does not seem to respect color keys
Status: RESOLVED INVALID
Alias: None
Product: SDL
Classification: Unclassified
Component: video (show other bugs)
Version: 2.0.3
Hardware: x86_64 Windows 7
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-06-19 16:00 UTC by Adam M.
Modified: 2015-06-19 20:28 UTC (History)
0 users

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Description Adam M. 2015-06-19 16:00:39 UTC 
This may or may not be a duplicate of #2979.

When converting an 8-bit surface with a color key to a 32-bit surface with an alpha channel, the color key doesn't seem to be translated into transparent pixels. For instance, I have an 8-bit image with a magenta color key. When converting to a 32-bit RGBA image, I get a bunch of opaque magenta pixels.
Comment 1 Adam M. 2015-06-19 20:28:50 UTC 
Other information:
* The conversion results in a 32-bit surface with no color key and blending enabled.
* With blending enabled, it looks alright.
* With blending disabled, I get the opaque magenta pixels.

I forgot that I had disabled blending as a workaround for bug #3023. So presumably it's creating magenta pixels with alpha = 0. This seems like correct enough behavior to me, so I'm closing this as INVALID.