Jelle Raaijmakers 99dd063c58 LibGfx: Factor out alpha type from GradientPainting ...

Knowing whether pixel color data is premultiplied or unpremultiplied is
useful in more places; factor it out so we can use the enum elsewhere.

Implement support for premultiplied alpha in `Color::with_alpha()` and
`::set_alpha()`.

2024-08-07 18:51:12 +02:00

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