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The Replacement Character (U+FFFD) is most commonly used to signal a text encoding error, i.e. when a stream of bytes couldn't be converted to a sequence of code points. For glyphs that don't exist in a particular font, our rendering logic already does the right thing by drawing empty boxes (`.notdef`); let's not forcibly turn these into U+FFFD during rendering.
57 lines
1.9 KiB
C++
57 lines
1.9 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/Debug.h>
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#include <LibUnicode/CharacterTypes.h>
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#include <LibUnicode/Emoji.h>
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namespace Gfx {
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DrawGlyphOrEmoji prepare_draw_glyph_or_emoji(FloatPoint point, Utf8CodePointIterator& it, Font const& font)
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{
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u32 code_point = *it;
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auto next_code_point = it.peek(1);
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ScopeGuard consume_variation_selector = [&, initial_it = it] {
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// If we advanced the iterator to consume an emoji sequence, don't look for another variation selector.
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if (initial_it != it)
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return;
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// Otherwise, discard one code point if it's a variation selector.
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if (next_code_point.has_value() && Unicode::code_point_has_variation_selector_property(*next_code_point))
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++it;
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};
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// NOTE: We don't check for emoji
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auto font_contains_glyph = font.contains_glyph(code_point);
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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);
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// If the font contains the glyph, and we know it's not the start of an emoji, draw a text glyph.
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if (font_contains_glyph && !check_for_emoji) {
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return DrawGlyph {
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.position = point,
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.code_point = code_point,
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};
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}
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// If we didn't find a text glyph, or have an emoji variation selector or regional indicator, try to draw an emoji glyph.
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if (auto const* emoji = Emoji::emoji_for_code_point_iterator(it)) {
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return DrawEmoji {
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.position = point,
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.emoji = emoji,
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};
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}
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return DrawGlyph {
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.position = point,
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.code_point = code_point,
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};
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}
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}
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