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// Copyright 2017 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/font_selector.h"
#include "build/build_config.h"
#include "third_party/blink/public/mojom/use_counter/metrics/web_feature.mojom-blink.h"
#include "third_party/blink/renderer/platform/fonts/alternate_font_family.h"
#include "third_party/blink/renderer/platform/fonts/font_cache.h"
#include "third_party/blink/renderer/platform/fonts/font_description.h"
#include "third_party/blink/renderer/platform/fonts/font_fallback_list.h"
#include "third_party/blink/renderer/platform/fonts/font_fallback_map.h"
#include "third_party/blink/renderer/platform/fonts/font_family.h"
#include "third_party/blink/renderer/platform/fonts/generic_font_family_settings.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
namespace blink {
AtomicString FontSelector::FamilyNameFromSettings(
const GenericFontFamilySettings& settings,
const FontDescription& font_description,
const FontFamily& generic_family,
UseCounter* use_counter) {
// Quoted <font-family> values corresponding to a <generic-family> keyword
// should not be converted to a family name via user settings.
auto& generic_family_name = generic_family.FamilyName();
if (font_description.GenericFamily() != FontDescription::kStandardFamily &&
font_description.GenericFamily() != FontDescription::kWebkitBodyFamily &&
!generic_family.FamilyIsGeneric() &&
generic_family_name != font_family_names::kWebkitStandard)
return g_empty_atom;
if (IsWebkitBodyFamily(font_description)) {
// TODO(yosin): We should make |use_counter| available for font threads.
if (use_counter) {
// TODO(crbug.com/1065468): Remove this counter when it's no longer
// necessary.
UseCounter::Count(use_counter,
WebFeature::kFontSelectorCSSFontFamilyWebKitPrefixBody);
}
} else if (generic_family_name == font_family_names::kWebkitStandard &&
!generic_family.FamilyIsGeneric()) {
// -webkit-standard is set internally only with a kGenericFamily type in
// FontFallbackList::GetFontData. So that non-generic -webkit-standard has
// been specified on the page. Don't treat it as <generic-family> keyword.
return g_empty_atom;
}
#if BUILDFLAG(IS_ANDROID)
// Noto Sans Math provides mathematical glyphs on Android but it does not
// contain any OpenType MATH table required for math layout.
// See https://github.com/googlefonts/noto-fonts/issues/330
// TODO(crbug.com/1228189): Should we still try and select a math font based
// on the presence of glyphs for math code points or a MATH table?
if (font_description.GenericFamily() == FontDescription::kStandardFamily ||
font_description.GenericFamily() == FontDescription::kWebkitBodyFamily ||
generic_family_name == font_family_names::kWebkitStandard) {
return FontCache::GetGenericFamilyNameForScript(
font_family_names::kWebkitStandard,
GetFallbackFontFamily(font_description), font_description);
}
if (generic_family_name == font_family_names::kSerif ||
generic_family_name == font_family_names::kSansSerif ||
generic_family_name == font_family_names::kCursive ||
generic_family_name == font_family_names::kFantasy ||
generic_family_name == font_family_names::kMonospace) {
return FontCache::GetGenericFamilyNameForScript(
generic_family_name, generic_family_name, font_description);
}
#else // BUILDFLAG(IS_ANDROID)
UScriptCode script = font_description.GetScript();
if (font_description.GenericFamily() == FontDescription::kStandardFamily ||
font_description.GenericFamily() == FontDescription::kWebkitBodyFamily)
return settings.Standard(script);
if (generic_family_name == font_family_names::kSerif)
return settings.Serif(script);
if (generic_family_name == font_family_names::kSansSerif)
return settings.SansSerif(script);
if (generic_family_name == font_family_names::kCursive)
return settings.Cursive(script);
if (generic_family_name == font_family_names::kFantasy)
return settings.Fantasy(script);
if (generic_family_name == font_family_names::kMonospace)
return settings.Fixed(script);
if (generic_family_name == font_family_names::kWebkitStandard)
return settings.Standard(script);
if (generic_family_name == font_family_names::kMath) {
return settings.Math(script);
}
#endif // BUILDFLAG(IS_ANDROID)
return g_empty_atom;
}
// static
bool FontSelector::IsWebkitBodyFamily(const FontDescription& font_description) {
return font_description.GenericFamily() == FontDescription::kWebkitBodyFamily;
}
void FontSelector::Trace(Visitor* visitor) const {
visitor->Trace(font_fallback_map_);
FontCacheClient::Trace(visitor);
}
FontFallbackMap& FontSelector::GetFontFallbackMap() {
if (!font_fallback_map_) {
font_fallback_map_ = MakeGarbageCollected<FontFallbackMap>(this);
RegisterForInvalidationCallbacks(font_fallback_map_);
}
return *font_fallback_map_;
}
} // namespace blink
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