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// Copyright 2022 The Chromium Authors
// 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/html/blocking_attribute.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/dom/space_split_string.h"
#include "third_party/blink/renderer/core/frame/web_feature.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"
namespace blink {
HashSet<AtomicString>& BlockingAttribute::SupportedTokens() const {
DEFINE_STATIC_LOCAL(HashSet<AtomicString>, tokens,
({
keywords::kRender,
}));
DEFINE_STATIC_LOCAL(HashSet<AtomicString>, tokens_with_frame_rate,
({
keywords::kRender,
keywords::kFullFrameRate,
}));
if (RenderBlockingFullFrameRateEnabled()) {
return tokens_with_frame_rate;
}
return tokens;
}
// static
bool BlockingAttribute::HasRenderToken(const String& attribute_value) {
if (attribute_value.empty()) {
return false;
}
return SpaceSplitString(AtomicString(attribute_value))
.Contains(keywords::kRender);
}
// static
bool BlockingAttribute::HasFullFrameRateToken(const String& attribute_value) {
if (attribute_value.empty()) {
return false;
}
return SpaceSplitString(AtomicString(attribute_value))
.Contains(keywords::kFullFrameRate);
}
bool BlockingAttribute::ValidateTokenValue(const AtomicString& token_value,
ExceptionState&) const {
return SupportedTokens().Contains(token_value);
}
RenderBlockingLevel BlockingAttribute::GetBlockingLevel() const {
if (HasRenderToken()) {
return RenderBlockingLevel::kBlock;
}
if (HasFullFrameRateToken() && RenderBlockingFullFrameRateEnabled()) {
return RenderBlockingLevel::kLimitFrameRate;
}
return RenderBlockingLevel::kNone;
}
void BlockingAttribute::OnAttributeValueChanged(const AtomicString& old_value,
const AtomicString& new_value) {
DidUpdateAttributeValue(old_value, new_value);
// TODO(crbug.com/397832388): Add use counter for full-frame-rate
if (contains(keywords::kRender)) {
GetElement().GetDocument().CountUse(
WebFeature::kBlockingAttributeRenderToken);
} else if (contains(keywords::kFullFrameRate) &&
RenderBlockingFullFrameRateEnabled()) {
GetElement().GetDocument().CountUse(
WebFeature::kBlockingAttributeFullFrameRateToken);
}
}
bool BlockingAttribute::RenderBlockingFullFrameRateEnabled() const {
return RuntimeEnabledFeatures::RenderBlockingFullFrameRateEnabled(
GetElement().GetExecutionContext());
}
} // namespace blink
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