Add support for Color profiles (ICC)

[dacap]

There were an issue about this but I cannot find it. Anyway I'll start writing the list of task to do this here:

• Libraries: Skia SkColorSpace, LittleCMS, etc.
• Check https://skia.org/user/sample/color
• Use a test suite like: https://kornel.ski/en/color
• Add color management options (load/save embedded profiles, options to assign/convert color profile in a sprite)

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Review these issues:

• https://community.aseprite.org/t/colors-displaying-differently/413
• https://community.aseprite.org/t/export-color-loss/1421
• https://community.aseprite.org/t/color-display-wrong-on-mac/1970

[mysterycoconut]

As a quick workaround on the Mac, I just changed skia_window_osx.mm line 340 to…

CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);

This basically interprets color data in the app as sRGB, and transforms it to the current display's profile on the fly (instead of the current behavior that assumed the color data was on the display's profile, and did not need any color transformation).

[dacap]

Thanks for the tip @mysterycoconut, I'll take a look to this issue in these weeks.

[cloewen8]

I recently ran into an issue with Affinity Designer improperly displaying a gif from Aseprite. It reported that a color profile was missing. Having Aseprite export with a color profile would help me out a lot!

[dacap]

I'm already making some progress on this issue: