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LibWeb: Add initial implementation of CRC2D.globalAlpha

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Works for fills and strokes (using colors, gradients, or patterns),
along with images.

fill_rect() has been updated to use fill_path(), which allows it to
easily transform the rect, and already supports opacity.

Co-authored-by: MacDue <macdue@dueutil.tech>
This commit is contained in:
Simon Danner 2023-05-19 22:42:47 +02:00 • committed by Andreas Kling
parent ff5d530aa3
commit 45f86466bb
8 changed files with 150 additions and 39 deletions
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6
Userland/Libraries/LibWeb/HTML/Canvas/CanvasCompositing.idl Normal file
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// https://html.spec.whatwg.org/multipage/canvas.html#canvascompositing
interface mixin CanvasCompositing {
// compositing
attribute unrestricted double globalAlpha; // (default 1.0)
// FIXME: attribute DOMString globalCompositeOperation; // (default "source-over")
};