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ladybird/Userland/Libraries/LibGfx/TextLayout.cpp
Andreas Kling aabad3b94e LibGfx: Remove a bunch of no-longer-used OpenType font code
We're not quite ready to remove the old OpenType implementation yet,
but let's carve off some unused stuff.
2024-08-20 09:30:05 +02:00

63 lines
2.4 KiB
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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "TextLayout.h"
#include "Font/Emoji.h"
#include <AK/TypeCasts.h>
#include <LibGfx/Font/ScaledFont.h>
#include <LibUnicode/Emoji.h>
#include <harfbuzz/hb.h>
namespace Gfx {
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>)
{
return DrawGlyph {
.position = position,
.glyph_id = glyph_info[index].codepoint,
};
}
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)
{
hb_buffer_t* buffer = hb_buffer_create();
ScopeGuard destroy_buffer = [&]() { hb_buffer_destroy(buffer); };
hb_buffer_add_utf8(buffer, reinterpret_cast<char const*>(string.bytes()), string.byte_length(), 0, -1);
hb_buffer_guess_segment_properties(buffer);
u32 glyph_count;
auto* glyph_info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
Vector<hb_glyph_info_t> const input_glyph_info({ glyph_info, glyph_count });
if (input_glyph_info.is_empty())
return;
auto* hb_font = font.harfbuzz_font();
hb_shape(hb_font, buffer, nullptr, 0);
glyph_info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
auto* positions = hb_buffer_get_glyph_positions(buffer, &glyph_count);
FloatPoint point = baseline_start;
for (size_t i = 0; i < glyph_count; ++i) {
auto position = point
- FloatPoint { 0, font.pixel_metrics().ascent }
+ FloatPoint { positions[i].x_offset, positions[i].y_offset } / text_shaping_resolution;
if (include_left_bearing == IncludeLeftBearing::Yes) {
VERIFY(is<Gfx::ScaledFont>(font));
auto bearing = static_cast<Gfx::ScaledFont const&>(font).glyph_metrics(glyph_info[i].codepoint).left_side_bearing;
position += FloatPoint { bearing, 0 };
}
callback(construct_glyph_or_emoji(i, position, font, { glyph_info, glyph_count }, input_glyph_info.span()));
point += FloatPoint { positions[i].x_advance, positions[i].y_advance } / text_shaping_resolution;
}
if (width.has_value())
*width = point.x();
}
}