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aabad3b94e
We're not quite ready to remove the old OpenType implementation yet, but let's carve off some unused stuff.
63 lines
2.4 KiB
C++
63 lines
2.4 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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#include "TextLayout.h"
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#include "Font/Emoji.h"
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#include <AK/TypeCasts.h>
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#include <LibGfx/Font/ScaledFont.h>
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#include <LibUnicode/Emoji.h>
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#include <harfbuzz/hb.h>
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namespace Gfx {
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static DrawGlyphOrEmoji construct_glyph_or_emoji(size_t index, FloatPoint const& position, Gfx::Font const&, Span<hb_glyph_info_t const> glyph_info, Span<hb_glyph_info_t const>)
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{
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return DrawGlyph {
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.position = position,
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.glyph_id = glyph_info[index].codepoint,
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};
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}
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void for_each_glyph_position(FloatPoint baseline_start, Utf8View string, Gfx::Font const& font, Function<void(DrawGlyphOrEmoji const&)> callback, IncludeLeftBearing include_left_bearing, Optional<float&> width)
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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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if (input_glyph_info.is_empty())
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return;
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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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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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if (include_left_bearing == IncludeLeftBearing::Yes) {
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VERIFY(is<Gfx::ScaledFont>(font));
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auto bearing = static_cast<Gfx::ScaledFont const&>(font).glyph_metrics(glyph_info[i].codepoint).left_side_bearing;
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position += FloatPoint { bearing, 0 };
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}
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callback(construct_glyph_or_emoji(i, position, font, { glyph_info, glyph_count }, input_glyph_info.span()));
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point += FloatPoint { positions[i].x_advance, positions[i].y_advance } / text_shaping_resolution;
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}
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if (width.has_value())
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*width = point.x();
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}
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}
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