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681771d210
Previously, we determined the positions of glyphs for each text run at the time of painting, which constituted a significant portion of the painting process according to profiles. However, since we already go through each glyph to figure out the width of each fragment during layout, we can simultaneously gather data about the position of each glyph in the layout phase and utilize this information in the painting phase. I had to update expectations for a couple of reference tests. These updates are due to the fact that we now measure glyph positions during layout using a 1x font, and then linearly scale each glyph's position to device pixels during painting. This approach should be acceptable, considering we measure a fragment's width and height with an unscaled font during layout.
90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018-2020, 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 <LibGfx/Rect.h>
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#include <LibGfx/TextLayout.h>
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#include <LibJS/Heap/GCPtr.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/PixelUnits.h>
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namespace Web::Layout {
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class LineBoxFragment {
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friend class LineBox;
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public:
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LineBoxFragment(Node const& layout_node, int start, int length, CSSPixelPoint offset, CSSPixelSize size, CSSPixels border_box_top, CSSPixels border_box_bottom, Vector<Gfx::DrawGlyphOrEmoji> glyph_run = {})
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: m_layout_node(layout_node)
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, m_start(start)
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, m_length(length)
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, m_offset(offset)
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, m_size(size)
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, m_border_box_top(border_box_top)
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, m_border_box_bottom(border_box_bottom)
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, m_glyph_run(move(glyph_run))
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{
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}
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Node const& layout_node() const { return m_layout_node; }
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int start() const { return m_start; }
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int length() const { return m_length; }
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CSSPixelRect const absolute_rect() const;
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CSSPixelPoint offset() const
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{
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return m_offset;
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}
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void set_offset(CSSPixelPoint offset) { m_offset = offset; }
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// The baseline of a fragment is the number of pixels from the top to the text baseline.
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void set_baseline(CSSPixels y) { m_baseline = y; }
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CSSPixels baseline() const { return m_baseline; }
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CSSPixelSize size() const
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{
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return m_size;
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}
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void set_width(CSSPixels width) { m_size.set_width(width); }
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void set_height(CSSPixels height) { m_size.set_height(height); }
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CSSPixels width() const { return m_size.width(); }
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CSSPixels height() const { return m_size.height(); }
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CSSPixels border_box_height() const
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{
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return m_border_box_top + height() + m_border_box_bottom;
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}
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CSSPixels border_box_top() const { return m_border_box_top; }
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CSSPixels border_box_bottom() const { return m_border_box_bottom; }
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CSSPixels absolute_x() const { return absolute_rect().x(); }
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bool ends_in_whitespace() const;
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bool is_justifiable_whitespace() const;
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StringView text() const;
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int text_index_at(CSSPixels x) const;
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CSSPixelRect selection_rect(Gfx::Font const&) const;
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bool is_atomic_inline() const;
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Vector<Gfx::DrawGlyphOrEmoji> const& glyph_run() const { return m_glyph_run; }
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private:
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JS::NonnullGCPtr<Node const> m_layout_node;
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int m_start { 0 };
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int m_length { 0 };
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CSSPixelPoint m_offset;
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CSSPixelSize m_size;
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CSSPixels m_border_box_top { 0 };
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CSSPixels m_border_box_bottom { 0 };
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CSSPixels m_baseline { 0 };
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Vector<Gfx::DrawGlyphOrEmoji> m_glyph_run;
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};
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}
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