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https://github.com/RGBCube/serenity
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efdbd8238e
This change separates a part of the `draw_text_run()` function, which is responsible for calculating the positions for glyphs that need to be painted, into a separate function called `get_glyph_run()`. It is a part of the preparation for text run painting using OpenGL, where we can't immediately blit glyph bitmaps but instead need to prepare a sequence of quads for them in advance.
134 lines
4.1 KiB
C++
134 lines
4.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
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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/CharacterTypes.h>
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#include <AK/DeprecatedString.h>
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#include <AK/Forward.h>
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#include <AK/Utf32View.h>
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#include <AK/Utf8View.h>
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#include <AK/Vector.h>
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#include <LibGfx/Font/Font.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/Rect.h>
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#include <LibGfx/TextElision.h>
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#include <LibGfx/TextWrapping.h>
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namespace Gfx {
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// FIXME: This currently isn't an ideal way of doing things; ideally, TextLayout
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// would be doing the rendering by painting individual glyphs. However, this
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// would regress our Unicode bidirectional text support. Therefore, fixing this
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// requires:
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// - Moving the bidirectional algorithm either here, or some place TextLayout
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// can access;
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// - Making TextLayout render the given text into something like a Vector<Line>
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// where:
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// using Line = Vector<DirectionalRun>;
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// struct DirectionalRun {
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// Utf32View glyphs;
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// Vector<int> advance;
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// TextDirection direction;
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// };
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// - Either;
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// a) Making TextLayout output these Lines directly using a given Painter, or
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// b) Taking the Lines from TextLayout and painting each glyph.
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class TextLayout {
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public:
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TextLayout(Gfx::Font const& font, Utf8View const& text, FloatRect const& rect)
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: m_font(font)
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, m_font_metrics(font.pixel_metrics())
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, m_text(text)
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, m_rect(rect)
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{
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}
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Vector<DeprecatedString, 32> lines(TextElision elision, TextWrapping wrapping) const
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{
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return wrap_lines(elision, wrapping);
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}
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FloatRect bounding_rect(TextWrapping) const;
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private:
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Vector<DeprecatedString, 32> wrap_lines(TextElision, TextWrapping) const;
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DeprecatedString elide_text_from_right(Utf8View) const;
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Font const& m_font;
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FontPixelMetrics m_font_metrics;
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Utf8View m_text;
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FloatRect m_rect;
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};
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inline bool should_paint_as_space(u32 code_point)
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{
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return is_ascii_space(code_point) || code_point == 0xa0;
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}
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enum class IncludeLeftBearing {
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Yes,
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No
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};
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struct DrawGlyph {
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FloatPoint position;
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u32 code_point;
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Font const* font;
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};
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struct DrawEmoji {
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IntPoint position;
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Gfx::Bitmap const* emoji;
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Font const* font;
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};
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using DrawGlyphOrEmoji = Variant<DrawGlyph, DrawEmoji>;
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Variant<DrawGlyph, DrawEmoji> prepare_draw_glyph_or_emoji(FloatPoint point, Utf8CodePointIterator& it, Font const& font);
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template<typename Callback>
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void for_each_glyph_position(FloatPoint baseline_start, Utf8View string, Font const& font, Callback callback, IncludeLeftBearing include_left_bearing = IncludeLeftBearing::No)
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{
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float space_width = font.glyph_width(' ') + font.glyph_spacing();
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u32 last_code_point = 0;
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auto point = baseline_start;
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point.translate_by(0, -font.pixel_metrics().ascent);
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for (auto code_point_iterator = string.begin(); code_point_iterator != string.end(); ++code_point_iterator) {
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auto code_point = *code_point_iterator;
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if (should_paint_as_space(code_point)) {
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point.translate_by(space_width, 0);
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last_code_point = code_point;
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continue;
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}
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auto kerning = font.glyphs_horizontal_kerning(last_code_point, code_point);
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if (kerning != 0.0f)
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point.translate_by(kerning, 0);
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auto it = code_point_iterator; // The callback function will advance the iterator, so create a copy for this lookup.
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auto glyph_width = font.glyph_or_emoji_width(it) + font.glyph_spacing();
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auto glyph_or_emoji = prepare_draw_glyph_or_emoji(point, code_point_iterator, font);
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if (include_left_bearing == IncludeLeftBearing::Yes) {
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if (glyph_or_emoji.has<DrawGlyph>())
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glyph_or_emoji.get<DrawGlyph>().position += FloatPoint(font.glyph_left_bearing(code_point), 0);
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}
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callback(glyph_or_emoji);
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point.translate_by(glyph_width, 0);
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last_code_point = code_point;
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}
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}
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Vector<DrawGlyphOrEmoji> get_glyph_run(FloatPoint baseline_start, Utf8View const& string, Font const& font, IncludeLeftBearing include_left_bearing = IncludeLeftBearing::No);
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}
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