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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.
#include "third_party/blink/renderer/platform/fonts/mac/character_fallback_cache.h"
#import <CoreFoundation/CoreFoundation.h>
#import <CoreText/CoreText.h>
#include "base/apple/scoped_cftyperef.h"
#include "base/strings/sys_string_conversions.h"
#include "third_party/blink/renderer/platform/wtf/hash_functions.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
using base::apple::ScopedCFTypeRef;
namespace blink {
namespace {
String BuildIdentifierKey(CTFontRef ct_font) {
if (!ct_font) {
return String();
}
ScopedCFTypeRef<CFStringRef> ct_postscript_name(
CTFontCopyPostScriptName(ct_font));
if (!ct_postscript_name || !CFStringGetLength(ct_postscript_name.get())) {
return String();
}
String postscript_name =
String::FromUTF8(base::SysCFStringRefToUTF8(ct_postscript_name.get()));
if (postscript_name[0] != '.') {
// Not a system UI font.
return postscript_name;
} else {
ScopedCFTypeRef<CTFontDescriptorRef> font_descriptor;
font_descriptor.reset(CTFontCopyFontDescriptor(ct_font));
if (!font_descriptor) {
return String();
}
WTF::StringBuilder result_builder;
ScopedCFTypeRef<CFDictionaryRef> attributes(
CTFontDescriptorCopyAttributes(font_descriptor.get()));
if (attributes) {
// System fonts created with CTFontCreateUIFontForLanguage seem to expose
// these two properties, which we can use to snapshot their fallback
// behavior.
CFStringRef ui_usage_value = (CFStringRef)CFDictionaryGetValue(
attributes.get(),
CFSTR("NSCTFontUIUsageAttribute")); // Private key value
if (ui_usage_value) {
result_builder.Append("UIFONTUSAGE:");
result_builder.Append(
String::FromUTF8(base::SysCFStringRefToUTF8(ui_usage_value)));
} else {
return String();
}
CFStringRef language_value = (CFStringRef)CFDictionaryGetValue(
attributes.get(), CFSTR("CTFontDescriptorLanguageAttribute"));
if (language_value) {
if (result_builder.length() > 0) {
result_builder.Append("-");
}
result_builder.Append("LANG:");
result_builder.Append(
String::FromUTF8(base::SysCFStringRefToUTF8(language_value)));
} else {
return String();
}
}
return result_builder.ToString();
}
}
} // namespace
std::optional<CharacterFallbackKey> CharacterFallbackKey::Make(
CTFontRef ct_font,
int16_t raw_font_weight,
int16_t raw_font_style,
uint8_t orientation,
float font_size) {
CharacterFallbackKey returnKey;
returnKey.font_identifier = BuildIdentifierKey(ct_font);
if (returnKey.font_identifier.empty()) {
return std::nullopt;
}
returnKey.weight = raw_font_weight;
returnKey.style = raw_font_style;
returnKey.font_size = font_size;
returnKey.orientation = orientation;
return returnKey;
}
unsigned CharacterFallbackKeyHashTraits::GetHash(
const CharacterFallbackKey& key) {
unsigned hash = WTF::GetHash(key.font_identifier);
WTF::AddIntToHash(hash, WTF::HashInt(key.weight));
WTF::AddIntToHash(hash, WTF::HashInt(key.style));
WTF::AddIntToHash(hash, WTF::HashInt(key.orientation));
WTF::AddIntToHash(hash, WTF::HashFloat(key.font_size));
return hash;
}
} // namespace blink
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