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https://github.com/RGBCube/serenity
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5c6621547c
When mousing over twitter, 17% of time was spent computing stacking context transform origins. Since this never changes after the stacking context is created, we can cache it and avoid all that work.
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Vector.h>
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#include <LibGfx/Matrix4x4.h>
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#include <LibWeb/Layout/Node.h>
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#include <LibWeb/Painting/Paintable.h>
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namespace Web::Painting {
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class StackingContext {
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public:
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StackingContext(Layout::Box&, StackingContext* parent);
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StackingContext* parent() { return m_parent; }
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StackingContext const* parent() const { return m_parent; }
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PaintableBox const& paintable() const { return *m_box.paint_box(); }
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enum class StackingContextPaintPhase {
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BackgroundAndBorders,
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Floats,
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BackgroundAndBordersForInlineLevelAndReplaced,
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Foreground,
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FocusAndOverlay,
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};
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void paint_descendants(PaintContext&, Layout::Node&, StackingContextPaintPhase) const;
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void paint(PaintContext&) const;
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Optional<HitTestResult> hit_test(Gfx::FloatPoint const&, HitTestType) const;
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Gfx::FloatMatrix4x4 const& transform_matrix() const { return m_transform; }
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Gfx::AffineTransform affine_transform_matrix() const;
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void dump(int indent = 0) const;
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void sort();
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private:
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Layout::Box& m_box;
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Gfx::FloatMatrix4x4 m_transform;
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Gfx::FloatPoint m_transform_origin;
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StackingContext* const m_parent { nullptr };
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Vector<StackingContext*> m_children;
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void paint_internal(PaintContext&) const;
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Gfx::FloatMatrix4x4 get_transformation_matrix(CSS::Transformation const& transformation) const;
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Gfx::FloatMatrix4x4 combine_transformations(Vector<CSS::Transformation> const& transformations) const;
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Gfx::FloatPoint transform_origin() const { return m_transform_origin; }
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Gfx::FloatPoint compute_transform_origin() const;
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};
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}
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