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a4d51b3dc2
The "paintable" state in Layout::Box was actually not safe to access until after layout had been performed. As a first step towards making this harder to mess up accidentally, this patch moves painting information from Layout::Box to a new class: Painting::Box. Every layout can have a corresponding paint box, and it holds the final used metrics determined by layout. The paint box is created and populated by FormattingState::commit(). I've also added DOM::Node::paint_box() as a convenient way to access the paint box (if available) of a given DOM node. Going forward, I believe this will allow us to better separate data that belongs to layout vs painting, and also open up opportunities for naturally invalidating caches in the paint box (since it's reconstituted by every layout.)
99 lines
3.2 KiB
C++
99 lines
3.2 KiB
C++
/*
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* Copyright (c) 2022, 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/HashMap.h>
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#include <LibGfx/Point.h>
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#include <LibWeb/Layout/Box.h>
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#include <LibWeb/Layout/LineBox.h>
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#include <LibWeb/Painting/Box.h>
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namespace Web::Layout {
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struct FormattingState {
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struct NodeState {
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float content_width { 0 };
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float content_height { 0 };
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Gfx::FloatPoint offset;
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float margin_left { 0 };
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float margin_right { 0 };
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float margin_top { 0 };
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float margin_bottom { 0 };
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float border_left { 0 };
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float border_right { 0 };
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float border_top { 0 };
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float border_bottom { 0 };
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float padding_left { 0 };
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float padding_right { 0 };
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float padding_top { 0 };
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float padding_bottom { 0 };
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float offset_left { 0 };
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float offset_right { 0 };
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float offset_top { 0 };
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float offset_bottom { 0 };
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Vector<LineBox> line_boxes;
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float margin_box_left() const { return margin_left + border_left + padding_left; }
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float margin_box_right() const { return margin_right + border_right + padding_right; }
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float margin_box_top() const { return margin_top + border_top + padding_top; }
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float margin_box_bottom() const { return margin_bottom + border_bottom + padding_bottom; }
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float border_box_left() const { return border_left + padding_left; }
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float border_box_right() const { return border_right + padding_right; }
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float border_box_top() const { return border_top + padding_top; }
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float border_box_bottom() const { return border_bottom + padding_bottom; }
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float border_box_width() const { return border_box_left() + content_width + border_box_right(); }
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float border_box_height() const { return border_box_top() + content_height + border_box_bottom(); }
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Optional<Painting::Box::OverflowData> overflow_data;
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Painting::Box::OverflowData& ensure_overflow_data()
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{
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if (!overflow_data.has_value())
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overflow_data = Painting::Box::OverflowData {};
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return *overflow_data;
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}
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Optional<LineBoxFragmentCoordinate> containing_line_box_fragment;
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// NOTE: NodeState is ref-counted and accessed via copy-on-write helpers below.
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size_t ref_count { 1 };
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void ref()
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{
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VERIFY(ref_count);
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++ref_count;
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}
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void unref()
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{
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VERIFY(ref_count);
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if (!--ref_count)
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delete this;
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}
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};
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void commit();
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// NOTE: get_mutable() will CoW the NodeState if it's shared with another FormattingContext.
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NodeState& get_mutable(NodeWithStyleAndBoxModelMetrics const&);
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// NOTE: get() will not CoW the NodeState.
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NodeState const& get(NodeWithStyleAndBoxModelMetrics const&) const;
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HashMap<NodeWithStyleAndBoxModelMetrics const*, NonnullRefPtr<NodeState>> nodes;
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};
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Gfx::FloatRect absolute_content_rect(Box const&, FormattingState const&);
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Gfx::FloatRect margin_box_rect(Box const&, FormattingState const&);
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Gfx::FloatRect margin_box_rect_in_ancestor_coordinate_space(Box const& box, Box const& ancestor_box, FormattingState const&);
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}
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