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Bug 5095

Summary: macOS has over-saturated colors when system colorspace isn't sRGB
Product: SDL Reporter: michaeljosephmaltese
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: ASSIGNED --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.1   
Hardware: All   
OS: Mac OS X (All)   

Description michaeljosephmaltese 2020-04-15 20:35:04 UTC 
On macOS, the display rendered is over-saturated.

You can see this by e.g. opening a PNG in Preview.app, and then displaying the same image in SDL (using a loader like libpng, libspng, lodepng, stb_image, etc that bypasses the system color management).

There was a previous commit to fix this https://hg.libsdl.org/SDL/rev/e5b39f4935c8 that set the window colorspace to sRGB, but apparently caused performance issues https://hg.libsdl.org/SDL/rev/3a847ed9f8b1https://hg.libsdl.org/SDL/rev/3a847ed9f8b1 .  I couldn't find any other references to this issue, though note that OpenTTD was able to _improve_ performance by setting the colorspace https://github.com/OpenTTD/OpenTTD/issues/7644

If setting the colorspace causes performance issues, then we should figure out another way to do it such that colors are rendered correctly.