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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_PLATFORM_FONTS_MAC_CHARACTER_FALLBACK_CACHE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_MAC_CHARACTER_FALLBACK_CACHE_H_
#include <optional>
#include "third_party/blink/renderer/platform/fonts/simple_font_data.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_map.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/hash_traits.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hasher.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
struct PLATFORM_EXPORT CharacterFallbackKey {
String font_identifier = "";
int16_t weight = 0;
int16_t style = 0;
float font_size = 0.f;
uint8_t orientation = 0;
bool operator==(const CharacterFallbackKey&) const = default;
static std::optional<CharacterFallbackKey> Make(CTFontRef ct_font,
int16_t raw_font_weight,
int16_t raw_font_style,
uint8_t orientation,
float font_size);
};
struct PLATFORM_EXPORT CharacterFallbackKeyHashTraits
: GenericHashTraits<CharacterFallbackKey> {
STATIC_ONLY(CharacterFallbackKeyHashTraits);
static unsigned GetHash(const CharacterFallbackKey& key);
static bool Equal(const CharacterFallbackKey& a,
const CharacterFallbackKey& b) {
return a == b;
}
static CharacterFallbackKey EmptyValue() {
CharacterFallbackKey empty_value;
empty_value.font_size = -1.0;
return empty_value;
}
static CharacterFallbackKey DeletedValue() {
CharacterFallbackKey deleted_value;
deleted_value.font_size = -2.0;
return deleted_value;
}
static constexpr bool kSafeToCompareToEmptyOrDeleted = true;
};
using CharacterFallbackCache = HeapHashMap<Member<const CharacterFallbackKey>,
WeakMember<const SimpleFontData>,
CharacterFallbackKeyHashTraits>;
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_MAC_CHARACTER_FALLBACK_CACHE_H_
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