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LibWeb+LibGfx: Support alpha in CanvasRenderingContext2D

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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.
This commit is contained in:
Jelle Raaijmakers 2025-04-28 16:12:30 +02:00
commit 35efd4d14b
Notes: github-actions[bot] 2025-04-29 11:52:28 +00:00
7 changed files with 68 additions and 12 deletions
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Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
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@ -160,6 +160,8 @@ private:
[[nodiscard]] Gfx::Path rect_path(float x, float y, float width, float height);
[[nodiscard]] Gfx::Path text_path(StringView text, float x, float y, Optional<double> max_width);
Gfx::Color clear_color() const;
void stroke_internal(Gfx::Path const&);
void fill_internal(Gfx::Path const&, Gfx::WindingRule);
void clip_internal(Gfx::Path&, Gfx::WindingRule);