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https://github.com/SerenityOS/serenity
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LibGfx: Use LibUnicode to filter code points that cannot start an emoji
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@ -51,35 +51,10 @@ Bitmap const* Emoji::emoji_for_code_points(ReadonlySpan<u32> const& code_points)
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return bitmap.ptr();
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}
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template<typename CodePointIterator>
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static bool could_be_emoji(CodePointIterator const& it)
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{
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if (it.done())
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return false;
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static constexpr u32 supplementary_private_use_area_b_first_code_point = 0x100000;
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if (*it >= supplementary_private_use_area_b_first_code_point) {
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// We use Supplementary Private Use Area-B for custom Serenity emoji.
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return true;
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}
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static auto const emoji_property = Unicode::property_from_string("Emoji"sv);
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if (!emoji_property.has_value()) {
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// This means Unicode data generation is disabled. Always check the disk in that case.
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return true;
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}
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return Unicode::code_point_has_property(*it, *emoji_property);
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}
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template<typename CodePointIterator>
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static Bitmap const* emoji_for_code_point_iterator_impl(CodePointIterator& it)
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{
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// NOTE: I'm sure this could be more efficient, e.g. by checking if each code point falls
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// into a certain range in the loop below (emojis, modifiers, variation selectors, ZWJ),
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// and bailing out early if not. Current worst case is 10 file lookups for any sequence of
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// code points (if the first glyph isn't part of the font in regular text rendering).
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if (!could_be_emoji(it))
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if (!Unicode::could_be_start_of_emoji_sequence(it))
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return nullptr;
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constexpr size_t max_emoji_code_point_sequence_length = 10;
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@ -34,6 +34,7 @@
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#include <LibGfx/TextDirection.h>
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#include <LibGfx/TextLayout.h>
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#include <LibUnicode/CharacterTypes.h>
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#include <LibUnicode/Emoji.h>
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#include <stdio.h>
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#if defined(AK_COMPILER_GCC)
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@ -1396,13 +1397,14 @@ void Painter::draw_glyph_or_emoji(FloatPoint point, u32 code_point, Font const&
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void Painter::draw_glyph_or_emoji(FloatPoint point, Utf8CodePointIterator& it, Font const& font, Color color)
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{
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static auto const emoji_component_property = Unicode::property_from_string("Emoji_Component"sv);
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static auto const variation_selector = Unicode::property_from_string("Variation_Selector"sv);
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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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static auto const variation_selector = Unicode::property_from_string("Variation_Selector"sv);
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if (!variation_selector.has_value())
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return;
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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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@ -1413,14 +1415,7 @@ void Painter::draw_glyph_or_emoji(FloatPoint point, Utf8CodePointIterator& it, F
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};
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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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if (emoji_component_property.has_value()) {
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auto code_point_is_emoji_component = Unicode::code_point_has_property(code_point, *emoji_component_property);
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auto next_code_point_is_emoji_component = next_code_point.has_value() && Unicode::code_point_has_property(*next_code_point, *emoji_component_property);
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check_for_emoji = code_point_is_emoji_component || next_code_point_is_emoji_component;
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}
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auto check_for_emoji = Unicode::could_be_start_of_emoji_sequence(it);
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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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