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b55023fad3
Previously we would resolve font features (https://drafts.csswg.org/css-fonts-4/#feature-variation-precedence) per element, while this works for the current subset of the font feature resolution algorithm that we support, some as yet unimplemented parts require us to know whether we are resolving against a CSS @font-face rule, and if so which one (e.g. applying descriptors from the @font-face rule, deciding which @font-feature-values rules to apply, etc). To achieve this we store the data required to resolve font features in a struct and pass that to `FontComputer` which resolves the font features and stores them with the computed `Font`. We no longer need to invalidate the font shaping cache when features change since the features are defined per font (and therefore won't ever change).
61 lines
2.4 KiB
C++
61 lines
2.4 KiB
C++
/*
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* Copyright (c) 2024, Johan Dahlin <jdahlin@gmail.com>
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* Copyright (c) 2026, Callum Law <callumlaw1709@outlook.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/FlyString.h>
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#include <AK/HashMap.h>
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#include <LibGfx/Font/FontVariant.h>
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#include <LibGfx/ShapeFeature.h>
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#include <LibWeb/CSS/Enums.h>
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#pragma once
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namespace Web::CSS {
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struct FontFeatureData {
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Optional<Gfx::FontVariantAlternates> font_variant_alternates;
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FontVariantCaps font_variant_caps;
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Optional<Gfx::FontVariantEastAsian> font_variant_east_asian;
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FontVariantEmoji font_variant_emoji;
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Optional<Gfx::FontVariantLigatures> font_variant_ligatures;
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Optional<Gfx::FontVariantNumeric> font_variant_numeric;
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FontVariantPosition font_variant_position;
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HashMap<FlyString, u8> font_feature_settings;
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FontKerning font_kerning;
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TextRendering text_rendering;
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Gfx::ShapeFeatures to_shape_features() const;
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bool operator==(FontFeatureData const& other) const = default;
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};
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}
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namespace AK {
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template<>
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struct Traits<Web::CSS::FontFeatureData> : public DefaultTraits<Web::CSS::FontFeatureData> {
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static unsigned hash(Web::CSS::FontFeatureData const& data)
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{
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u32 hash = 0;
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hash = pair_int_hash(hash, data.font_variant_alternates.has_value() ? Traits<Gfx::FontVariantAlternates>::hash(data.font_variant_alternates.value()) : -1);
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hash = pair_int_hash(hash, to_underlying(data.font_variant_caps));
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hash = pair_int_hash(hash, data.font_variant_east_asian.has_value() ? Traits<Gfx::FontVariantEastAsian>::hash(data.font_variant_east_asian.value()) : -1);
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hash = pair_int_hash(hash, to_underlying(data.font_variant_emoji));
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hash = pair_int_hash(hash, data.font_variant_ligatures.has_value() ? Traits<Gfx::FontVariantLigatures>::hash(data.font_variant_ligatures.value()) : -1);
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hash = pair_int_hash(hash, data.font_variant_numeric.has_value() ? Traits<Gfx::FontVariantNumeric>::hash(data.font_variant_numeric.value()) : -1);
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hash = pair_int_hash(hash, to_underlying(data.font_variant_position));
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hash = pair_int_hash(hash, to_underlying(data.font_kerning));
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hash = pair_int_hash(hash, to_underlying(data.text_rendering));
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for (auto const& [key, value] : data.font_feature_settings)
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hash = pair_int_hash(hash, pair_int_hash(key.hash(), value));
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return hash;
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}
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};
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}
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