Jelle Raaijmakers 35efd4d14b LibWeb+LibGfx: Support alpha in CanvasRenderingContext2D ...

This is implemented by these related changes:

  * The Skia alpha type 'Opaque' is selected for surfaces that were
    created with the intention of not having an alpha channel.
    Previously we were simply creating one with alpha.

  * Clearing now happens through Skia's `clear()` which always uses the
    source color's value for the result, instead of setting all values
    to 0.

  * CanvasRenderingContext2D selects a different clearing color based on
    the `alpha` context attribute's value.

2025-04-29 13:51:23 +02:00

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