mirror of
https://github.com/RGBCube/serenity
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50d33f79fa
This updates fonts so rather than rastering directly to a bitmap, you
can extract paths for glyphs. This is then used to implement a
Gfx::Path::text("some text", font) API, that if given a vector font
appends the path of the text to your Gfx::Path. This then allows
arbitrary manipulation of the text (rotation, skewing, etc), paving the
way for Word Art in Serenity.
123 lines
3.7 KiB
C++
123 lines
3.7 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 GlyphPosition {
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FloatPoint position;
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float glyph_width;
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AK::Utf8CodePointIterator& it;
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};
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template<typename Callback>
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void for_each_glyph_position(FloatPoint start, Utf8View text, 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 = start;
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point.translate_by(0, -font.pixel_metrics().ascent);
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for (auto code_point_iterator = text.begin(); code_point_iterator != text.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_point = point;
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if (include_left_bearing == IncludeLeftBearing::Yes)
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glyph_point += FloatPoint(font.glyph_left_bearing(code_point), 0);
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callback(GlyphPosition {
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.position = glyph_point,
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.glyph_width = glyph_width,
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.it = code_point_iterator });
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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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}
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