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57 lines
2 KiB
C++
57 lines
2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.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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#include "TextLayout.h"
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#include <AK/TypeCasts.h>
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#include <LibGfx/Font/ScaledFont.h>
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#include <harfbuzz/hb.h>
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namespace Gfx {
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RefPtr<GlyphRun> shape_text(FloatPoint baseline_start, float letter_spacing, Utf8View string, Gfx::Font const& font, GlyphRun::TextType text_type)
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{
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hb_buffer_t* buffer = hb_buffer_create();
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ScopeGuard destroy_buffer = [&]() { hb_buffer_destroy(buffer); };
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hb_buffer_add_utf8(buffer, reinterpret_cast<char const*>(string.bytes()), string.byte_length(), 0, -1);
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hb_buffer_guess_segment_properties(buffer);
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u32 glyph_count;
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auto* glyph_info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
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Vector<hb_glyph_info_t> const input_glyph_info({ glyph_info, glyph_count });
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auto* hb_font = font.harfbuzz_font();
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hb_shape(hb_font, buffer, nullptr, 0);
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glyph_info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
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auto* positions = hb_buffer_get_glyph_positions(buffer, &glyph_count);
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Vector<Gfx::DrawGlyph> glyph_run;
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FloatPoint point = baseline_start;
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for (size_t i = 0; i < glyph_count; ++i) {
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auto position = point
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- FloatPoint { 0, font.pixel_metrics().ascent }
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+ FloatPoint { positions[i].x_offset, positions[i].y_offset } / text_shaping_resolution;
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glyph_run.append({ position, glyph_info[i].codepoint });
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point += FloatPoint { positions[i].x_advance, positions[i].y_advance } / text_shaping_resolution;
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// don't apply spacing to last glyph
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// https://drafts.csswg.org/css-text/#example-7880704e
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if (i != (glyph_count - 1))
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point.translate_by(letter_spacing, 0);
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}
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return adopt_ref(*new Gfx::GlyphRun(move(glyph_run), font, text_type, point.x()));
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}
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float measure_text_width(Utf8View const& string, Gfx::Font const& font)
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{
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auto glyph_run = shape_text({}, 0, string, font, GlyphRun::TextType::Common);
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return glyph_run->width();
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}
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}
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