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LibGfx: Add basic variation selector and regional indicator support :^)
I'm sure there's a spec for this somewhere, but this is a first working approximation. Closes #3315.
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1 changed files with 38 additions and 3 deletions
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@ -1249,21 +1249,56 @@ void Painter::draw_glyph_or_emoji(IntPoint const& point, u32 code_point, Font co
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void Painter::draw_glyph_or_emoji(IntPoint const& point, Utf8CodePointIterator& it, Font const& font, Color color)
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{
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// FIXME: Handle variation selectors. Additionally, some emojis start with a 'regular' character,
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// so the 'font contains' check isn't sufficient for all of them - we'll have to peek.
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// FIXME: These should live somewhere else.
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constexpr u32 text_variation_selector = 0xFE0E;
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constexpr u32 emoji_variation_selector = 0xFE0F;
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constexpr u32 regional_indicator_symbol_a = 0x1F1E6;
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constexpr u32 regional_indicator_symbol_z = 0x1F1FF;
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auto initial_it = it;
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u32 code_point = *it;
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auto next_code_point = it.peek(1);
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if (font.contains_glyph(code_point)) {
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ScopeGuard consume_variation_selector = [&] {
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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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auto next_code_point = it.peek(1);
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if (next_code_point == text_variation_selector || next_code_point == emoji_variation_selector)
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++it;
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};
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auto code_point_is_regional_indicator = code_point >= regional_indicator_symbol_a && code_point <= regional_indicator_symbol_z;
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auto font_contains_glyph = font.contains_glyph(code_point);
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auto check_for_emoji = false
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// Flag emojis consist of two regional indicators.
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|| code_point_is_regional_indicator
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// U+00A9 (copyright) or U+00AE (registered) are text glyphs by default,
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// keycap emojis ({#,*,0-9} U+FE0F U+20E3) start with a regular ASCII character.
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// Both cases are handled by peeking for the variation selector.
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|| next_code_point == emoji_variation_selector;
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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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draw_glyph(point, code_point, font, color);
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return;
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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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draw_emoji(point, *emoji, font);
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return;
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}
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// If that failed, but we have a text glyph fallback, draw that.
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if (font_contains_glyph) {
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draw_glyph(point, code_point, font, color);
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return;
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}
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// No suitable glyph found, draw a replacement character.
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dbgln_if(EMOJI_DEBUG, "Failed to find a glyph or emoji for code_point {}", code_point);
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draw_glyph(point, 0xFFFD, font, color);
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}
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