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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MIXIN_MAP_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MIXIN_MAP_H_
#include "third_party/blink/renderer/core/css/resolver/media_query_result.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_map.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_vector.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"
namespace blink {
class StyleRuleMixin;
// The set of mixins available when building a given RuleSet.
// Typically contains all mixins from a given TreeScope
// (and possibly non-overridden ones from parent TreeScopes,
// after we've done appropriate merging), plus information
// needed for invalidation.
struct MixinMap {
DISALLOW_NEW();
public:
HeapHashMap<AtomicString, Member<StyleRuleMixin>> mixins;
// Media queries that affected the contents of “mixins”.
// We currently store only one set of flags, not specifically
// which mixin would be invalidated by which media query.
MediaQueryResultFlags media_query_result_flags;
HeapVector<MediaQuerySetResult> media_query_set_results;
// See StyleSheetCollection::mixin_generation_. This is only
// set for the final (merged) MixinMaps for an entire scope,
// not when extracting mixins from a single stylesheet.
uint64_t generation = 0;
// Add everything from “other” to this map, overwriting
// any mixins that may already exist. Does not touch “generation”.
void Merge(const MixinMap& other);
void Trace(Visitor* visitor) const {
visitor->Trace(mixins);
visitor->Trace(media_query_set_results);
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MIXIN_MAP_H_
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