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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/animation/css_font_variation_settings_interpolation_type.h"
#include <memory>
#include <utility>
#include "base/memory/ptr_util.h"
#include "third_party/blink/renderer/core/css/css_font_variation_value.h"
#include "third_party/blink/renderer/core/css/css_value_list.h"
#include "third_party/blink/renderer/core/css/resolver/style_builder_converter.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/wtf/math_extras.h"
namespace blink {
class CSSFontVariationSettingsNonInterpolableValue
: public NonInterpolableValue {
public:
~CSSFontVariationSettingsNonInterpolableValue() final = default;
static scoped_refptr<CSSFontVariationSettingsNonInterpolableValue> Create(
Vector<uint32_t> tags) {
return base::AdoptRef(
new CSSFontVariationSettingsNonInterpolableValue(std::move(tags)));
}
const Vector<uint32_t>& Tags() const { return tags_; }
DECLARE_NON_INTERPOLABLE_VALUE_TYPE();
private:
explicit CSSFontVariationSettingsNonInterpolableValue(Vector<uint32_t> tags)
: tags_(std::move(tags)) {
DCHECK_GT(tags_.size(), 0u);
}
const Vector<uint32_t> tags_;
};
DEFINE_NON_INTERPOLABLE_VALUE_TYPE(
CSSFontVariationSettingsNonInterpolableValue);
template <>
struct DowncastTraits<CSSFontVariationSettingsNonInterpolableValue> {
static bool AllowFrom(const NonInterpolableValue* value) {
return value && AllowFrom(*value);
}
static bool AllowFrom(const NonInterpolableValue& value) {
return value.GetType() ==
CSSFontVariationSettingsNonInterpolableValue::static_type_;
}
};
static const Vector<uint32_t> GetTags(
const NonInterpolableValue& non_interpolable_value) {
return To<CSSFontVariationSettingsNonInterpolableValue>(
non_interpolable_value)
.Tags();
}
static bool TagsMatch(const NonInterpolableValue& a,
const NonInterpolableValue& b) {
return GetTags(a) == GetTags(b);
}
class UnderlyingTagsChecker : public InterpolationType::ConversionChecker {
public:
explicit UnderlyingTagsChecker(const Vector<uint32_t>& tags) : tags_(tags) {}
~UnderlyingTagsChecker() final = default;
private:
bool IsValid(const InterpolationEnvironment&,
const InterpolationValue& underlying) const final {
return tags_ == GetTags(*underlying.non_interpolable_value);
}
const Vector<uint32_t> tags_;
};
class InheritedFontVariationSettingsChecker
: public CSSInterpolationType::CSSConversionChecker {
public:
explicit InheritedFontVariationSettingsChecker(
const FontVariationSettings* settings)
: settings_(settings) {}
~InheritedFontVariationSettingsChecker() final = default;
private:
bool IsValid(const StyleResolverState& state,
const InterpolationValue&) const final {
return DataEquivalent(
settings_.get(),
state.ParentStyle()->GetFontDescription().VariationSettings());
}
scoped_refptr<const FontVariationSettings> settings_;
};
static InterpolationValue ConvertFontVariationSettings(
const FontVariationSettings* settings) {
if (!settings || settings->size() == 0) {
return nullptr;
}
wtf_size_t length = settings->size();
auto numbers = std::make_unique<InterpolableList>(length);
Vector<uint32_t> tags;
for (wtf_size_t i = 0; i < length; ++i) {
numbers->Set(i,
std::make_unique<InterpolableNumber>(settings->at(i).Value()));
tags.push_back(settings->at(i).Tag());
}
return InterpolationValue(
std::move(numbers),
CSSFontVariationSettingsNonInterpolableValue::Create(std::move(tags)));
}
InterpolationValue
CSSFontVariationSettingsInterpolationType::MaybeConvertNeutral(
const InterpolationValue& underlying,
ConversionCheckers& conversion_checkers) const {
conversion_checkers.push_back(std::make_unique<UnderlyingTagsChecker>(
GetTags(*underlying.non_interpolable_value)));
return InterpolationValue(underlying.interpolable_value->CloneAndZero(),
underlying.non_interpolable_value);
}
InterpolationValue
CSSFontVariationSettingsInterpolationType::MaybeConvertInitial(
const StyleResolverState&,
ConversionCheckers&) const {
return ConvertFontVariationSettings(FontBuilder::InitialVariationSettings());
}
InterpolationValue
CSSFontVariationSettingsInterpolationType::MaybeConvertInherit(
const StyleResolverState& state,
ConversionCheckers& conversion_checkers) const {
const FontVariationSettings* inherited =
state.ParentStyle()->GetFontDescription().VariationSettings();
conversion_checkers.push_back(
std::make_unique<InheritedFontVariationSettingsChecker>(inherited));
return ConvertFontVariationSettings(inherited);
}
InterpolationValue CSSFontVariationSettingsInterpolationType::MaybeConvertValue(
const CSSValue& value,
const StyleResolverState* state,
ConversionCheckers&) const {
scoped_refptr<FontVariationSettings> settings =
StyleBuilderConverter::ConvertFontVariationSettings(*state, value);
return ConvertFontVariationSettings(settings.get());
}
InterpolationValue CSSFontVariationSettingsInterpolationType::
MaybeConvertStandardPropertyUnderlyingValue(
const ComputedStyle& style) const {
return ConvertFontVariationSettings(
style.GetFontDescription().VariationSettings());
}
PairwiseInterpolationValue
CSSFontVariationSettingsInterpolationType::MaybeMergeSingles(
InterpolationValue&& start,
InterpolationValue&& end) const {
if (TagsMatch(*start.non_interpolable_value, *end.non_interpolable_value)) {
return PairwiseInterpolationValue(std::move(start.interpolable_value),
std::move(end.interpolable_value),
std::move(start.non_interpolable_value));
}
return nullptr;
}
void CSSFontVariationSettingsInterpolationType::Composite(
UnderlyingValueOwner& underlying_value_owner,
double underlying_fraction,
const InterpolationValue& value,
double interpolation_fraction) const {
if (TagsMatch(*underlying_value_owner.Value().non_interpolable_value,
*value.non_interpolable_value)) {
underlying_value_owner.MutableValue().interpolable_value->ScaleAndAdd(
underlying_fraction, *value.interpolable_value);
} else {
underlying_value_owner.Set(*this, value);
}
}
void CSSFontVariationSettingsInterpolationType::ApplyStandardPropertyValue(
const InterpolableValue& interpolable_value,
const NonInterpolableValue* non_interpolable_value,
StyleResolverState& state) const {
const auto& numbers = To<InterpolableList>(interpolable_value);
const Vector<uint32_t>& tags = GetTags(*non_interpolable_value);
DCHECK_EQ(numbers.length(), tags.size());
scoped_refptr<FontVariationSettings> settings =
FontVariationSettings::Create();
wtf_size_t length = numbers.length();
// Do clampTo here, which follows the same logic as ConsumeFontVariationTag.
for (wtf_size_t i = 0; i < length; ++i) {
settings->Append(FontVariationAxis(
tags[i],
clampTo<float>(To<InterpolableNumber>(numbers.Get(i))->Value())));
}
state.GetFontBuilder().SetVariationSettings(settings);
}
} // namespace blink
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