mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-11-01 05:41:01 +00:00
7181c3f2ea
The ChunkIterator now limits a chunk to using only one font (before, it was possible to have a chunk with >1 font, when `unicode-range` CSS property is used). This change allows us to reduce some complexity in the text shaping and painting code and makes us compatible with the APIs in Skia and HarfBuzz.
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
/*
|
|
* 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/Debug.h>
|
|
#include <LibUnicode/CharacterTypes.h>
|
|
#include <LibUnicode/Emoji.h>
|
|
|
|
namespace Gfx {
|
|
|
|
DrawGlyphOrEmoji prepare_draw_glyph_or_emoji(FloatPoint point, Utf8CodePointIterator& it, Font const& font)
|
|
{
|
|
u32 code_point = *it;
|
|
auto next_code_point = it.peek(1);
|
|
|
|
ScopeGuard consume_variation_selector = [&, initial_it = it] {
|
|
// If we advanced the iterator to consume an emoji sequence, don't look for another variation selector.
|
|
if (initial_it != it)
|
|
return;
|
|
|
|
// Otherwise, discard one code point if it's a variation selector.
|
|
if (next_code_point.has_value() && Unicode::code_point_has_variation_selector_property(*next_code_point))
|
|
++it;
|
|
};
|
|
|
|
// NOTE: We don't check for emoji
|
|
auto font_contains_glyph = font.contains_glyph(code_point);
|
|
auto check_for_emoji = !font.has_color_bitmaps() && Unicode::could_be_start_of_emoji_sequence(it, font_contains_glyph ? Unicode::SequenceType::EmojiPresentation : Unicode::SequenceType::Any);
|
|
|
|
// If the font contains the glyph, and we know it's not the start of an emoji, draw a text glyph.
|
|
if (font_contains_glyph && !check_for_emoji) {
|
|
return DrawGlyph {
|
|
.position = point,
|
|
.code_point = code_point,
|
|
};
|
|
}
|
|
|
|
// If we didn't find a text glyph, or have an emoji variation selector or regional indicator, try to draw an emoji glyph.
|
|
if (auto const* emoji = Emoji::emoji_for_code_point_iterator(it)) {
|
|
return DrawEmoji {
|
|
.position = point,
|
|
.emoji = emoji,
|
|
};
|
|
}
|
|
|
|
// If that failed, but we have a text glyph fallback, draw that.
|
|
if (font_contains_glyph) {
|
|
return DrawGlyph {
|
|
.position = point,
|
|
.code_point = code_point,
|
|
};
|
|
}
|
|
|
|
// No suitable glyph found, draw a replacement character.
|
|
dbgln_if(EMOJI_DEBUG, "Failed to find a glyph or emoji for code_point {}", code_point);
|
|
return DrawGlyph {
|
|
.position = point,
|
|
.code_point = 0xFFFD,
|
|
};
|
|
}
|
|
|
|
}
|