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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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11
Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
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@ -16,6 +16,7 @@
#include <LibGfx/Painter.h>
#include <LibGfx/Path.h>
#include <LibWeb/Bindings/PlatformObject.h>
#include <LibWeb/HTML/Canvas/CanvasCompositing.h>
#include <LibWeb/HTML/Canvas/CanvasDrawImage.h>
#include <LibWeb/HTML/Canvas/CanvasDrawPath.h>
#include <LibWeb/HTML/Canvas/CanvasFillStrokeStyles.h>
@ -51,6 +52,7 @@ class CanvasRenderingContext2D
, public CanvasDrawImage
, public CanvasImageData
, public CanvasImageSmoothing
, public CanvasCompositing
, public CanvasPathDrawingStyles<CanvasRenderingContext2D> {
WEB_PLATFORM_OBJECT(CanvasRenderingContext2D, Bindings::PlatformObject);
@ -93,6 +95,9 @@ public:
virtual Bindings::ImageSmoothingQuality image_smoothing_quality() const override;
virtual void set_image_smoothing_quality(Bindings::ImageSmoothingQuality) override;
virtual float global_alpha() const override;
virtual void set_global_alpha(float) override;
private:
explicit CanvasRenderingContext2D(JS::Realm&, HTMLCanvasElement&);
@ -133,9 +138,11 @@ private:
HTMLCanvasElement& canvas_element();
HTMLCanvasElement const& canvas_element() const;
Gfx::Path rect_path(float x, float y, float width, float height);
void stroke_internal(Gfx::Path const&);
void fill_internal(Gfx::Path&, Gfx::Painter::WindingRule winding_rule);
void clip_internal(Gfx::Path&, Gfx::Painter::WindingRule winding_rule);
void fill_internal(Gfx::Path const&, Gfx::Painter::WindingRule);
void clip_internal(Gfx::Path&, Gfx::Painter::WindingRule);
JS::NonnullGCPtr<HTMLCanvasElement> m_element;
OwnPtr<Gfx::Painter> m_painter;