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LibWeb: Add initial implementation of CRC2D.clip()

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This allows clipping your drawing by any path you like! To do this
all painting has been wrapped around a new draw_clipped() helper
method, which handles the clipping before/after painting.

Note: This clipping is currently missing support for intersecting
clip paths.
This commit is contained in:
MacDue 2023-04-06 20:57:59 +01:00 • committed by Linus Groh
parent 92d9b6edb8
commit 20e9213cc4
5 changed files with 126 additions and 102 deletions
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21
Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
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@ -22,6 +22,7 @@
#include <LibWeb/HTML/Canvas/CanvasImageData.h>
#include <LibWeb/HTML/Canvas/CanvasImageSmoothing.h>
#include <LibWeb/HTML/Canvas/CanvasPath.h>
#include <LibWeb/HTML/Canvas/CanvasPathClipper.h>
#include <LibWeb/HTML/Canvas/CanvasPathDrawingStyles.h>
#include <LibWeb/HTML/Canvas/CanvasRect.h>
#include <LibWeb/HTML/Canvas/CanvasState.h>
@ -84,7 +85,8 @@ public:
virtual JS::NonnullGCPtr<TextMetrics> measure_text(DeprecatedString const& text) override;
virtual void clip() override;
virtual void clip(DeprecatedString const& fill_rule) override;
virtual void clip(Path2D& path, DeprecatedString const& fill_rule) override;
virtual bool image_smoothing_enabled() const override;
virtual void set_image_smoothing_enabled(bool) override;
@ -109,6 +111,20 @@ private:
};
void did_draw(Gfx::FloatRect const&);
template<typename TDrawFunction>
void draw_clipped(TDrawFunction draw_function)
{
auto painter = this->antialiased_painter();
if (!painter.has_value())
return;
ScopedCanvasPathClip clipper(painter->underlying_painter(), drawing_state().clip);
auto draw_rect = draw_function(*painter);
if (drawing_state().clip.has_value())
draw_rect.intersect(drawing_state().clip->path.bounding_box());
did_draw(draw_rect);
}
PreparedText prepare_text(DeprecatedString const& text, float max_width = INFINITY);
Gfx::Painter* painter();
@ -118,7 +134,8 @@ private:
HTMLCanvasElement const& canvas_element() const;
void stroke_internal(Gfx::Path const&);
void fill_internal(Gfx::Path&, DeprecatedString const& fill_rule);
void fill_internal(Gfx::Path&, StringView fill_rule);
void clip_internal(Gfx::Path&, StringView fill_rule);
JS::NonnullGCPtr<HTMLCanvasElement> m_element;
OwnPtr<Gfx::Painter> m_painter;