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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of Google Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_CACHE_KEY_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_CACHE_KEY_H_
#include <limits>
#include "base/memory/values_equivalent.h"
#include "base/numerics/safe_conversions.h"
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/fonts/font_face_creation_params.h"
#include "third_party/blink/renderer/platform/fonts/font_palette.h"
#include "third_party/blink/renderer/platform/fonts/font_size_adjust.h"
#include "third_party/blink/renderer/platform/fonts/font_variant_alternates.h"
#include "third_party/blink/renderer/platform/fonts/opentype/font_settings.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/hash_table_deleted_value_type.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
namespace blink {
// Multiplying the floating point size by 100 gives two decimal point
// precision which should be sufficient.
static constexpr unsigned kFontSizePrecisionMultiplier = 100;
struct FontCacheKey {
DISALLOW_NEW();
public:
FontCacheKey() = default;
FontCacheKey(
FontFaceCreationParams creation_params,
float font_size,
unsigned options,
float device_scale_factor,
FontSizeAdjust size_adjust,
scoped_refptr<const FontVariationSettings> variation_settings,
scoped_refptr<const FontPalette> palette,
scoped_refptr<const FontVariantAlternates> font_variant_alternates,
bool is_unique_match)
: creation_params_(creation_params),
font_size_(base::saturated_cast<unsigned>(
font_size * kFontSizePrecisionMultiplier)),
options_(options),
device_scale_factor_(device_scale_factor),
size_adjust_(size_adjust),
variation_settings_(std::move(variation_settings)),
palette_(palette),
font_variant_alternates_(font_variant_alternates),
is_unique_match_(is_unique_match) {}
FontCacheKey(WTF::HashTableDeletedValueType)
: font_size_(std::numeric_limits<unsigned>::max()),
device_scale_factor_(std::numeric_limits<float>::max()) {}
bool IsHashTableDeletedValue() const {
return font_size_ == std::numeric_limits<unsigned>::max() &&
device_scale_factor_ == std::numeric_limits<float>::max();
}
unsigned GetHash() const {
// Convert from float with 3 digit precision before hashing.
unsigned device_scale_factor_hash = device_scale_factor_ * 1000;
unsigned hash_codes[10] = {
creation_params_.GetHash(),
font_size_,
options_,
device_scale_factor_hash,
size_adjust_ ? size_adjust_.GetHash() : 0,
#if BUILDFLAG(IS_ANDROID)
(locale_.empty() ? 0 : WTF::GetHash(locale_)) ^
#endif // BUILDFLAG(IS_ANDROID)
(variation_settings_ ? variation_settings_->GetHash() : 0),
palette_ ? palette_->GetHash() : 0,
font_variant_alternates_ ? font_variant_alternates_->GetHash() : 0,
is_unique_match_
};
return StringHasher::HashMemory(base::as_byte_span(hash_codes));
}
bool operator==(const FontCacheKey& other) const {
bool variation_settings_equal =
(!variation_settings_ && !other.variation_settings_) ||
(variation_settings_ && other.variation_settings_ &&
*variation_settings_ == *other.variation_settings_);
bool palette_equal =
(!palette_ && !other.palette_) ||
(palette_ && other.palette_ && *palette_ == *other.palette_);
return creation_params_ == other.creation_params_ &&
font_size_ == other.font_size_ && options_ == other.options_ &&
device_scale_factor_ == other.device_scale_factor_ &&
size_adjust_ == other.size_adjust_ &&
#if BUILDFLAG(IS_ANDROID)
locale_ == other.locale_ &&
#endif // BUILDFLAG(IS_ANDROID)
variation_settings_equal && palette_equal &&
base::ValuesEquivalent(font_variant_alternates_,
other.font_variant_alternates_) &&
is_unique_match_ == other.is_unique_match_;
}
bool operator!=(const FontCacheKey& other) const { return !(*this == other); }
static constexpr unsigned PrecisionMultiplier() {
return kFontSizePrecisionMultiplier;
}
#if BUILDFLAG(IS_ANDROID)
// Set the locale if the font is locale-specific. This allows different
// |FontPlatformData| instances for each locale.
void SetLocale(const AtomicString& locale) { locale_ = locale.LowerASCII(); }
#endif // BUILDFLAG(IS_ANDROID)
private:
FontFaceCreationParams creation_params_;
unsigned font_size_ = 0;
unsigned options_ = 0;
// FontCacheKey is the key to retrieve FontPlatformData entries from the
// FontCache. FontPlatformData queries the platform's font render style, which
// is dependent on the device scale factor. That's why we need
// device_scale_factor_ to be a part of computing the cache key.
float device_scale_factor_ = 0;
#if BUILDFLAG(IS_ANDROID)
AtomicString locale_;
#endif // BUILDFLAG(IS_ANDROID)
FontSizeAdjust size_adjust_;
scoped_refptr<const FontVariationSettings> variation_settings_;
scoped_refptr<const FontPalette> palette_;
scoped_refptr<const FontVariantAlternates> font_variant_alternates_;
bool is_unique_match_ = false;
};
} // namespace blink
namespace WTF {
template <>
struct HashTraits<blink::FontCacheKey>
: WTF::SimpleClassHashTraits<blink::FontCacheKey> {
// std::string's empty state need not be zero in all implementations,
// and it is held within FontFaceCreationParams.
static const bool kEmptyValueIsZero = false;
};
// `FontCacheKey` contains an `std::string` (via `FontFaceCreationParams`)
// which contains poisoned metadata for detecting buffer overflows in short
// strings. Copying this string as part of `KeyValuePairExtractor` will thus
// trigger ASAN warnings.
static_assert(!HashTraits<blink::FontCacheKey>::kCanTraceConcurrently);
} // namespace WTF
template <>
struct std::hash<blink::FontCacheKey> {
std::size_t operator()(blink::FontCacheKey const& s) const noexcept {
return static_cast<size_t>(s.GetHash());
}
};
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_CACHE_KEY_H_
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