third_party/blink/renderer/platform/fonts/android/font_cache_android.cc - chromium/src - Git at Google

 /*
  * Copyright (c) 2011 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * 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.
  *     * 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.
  */

 #include "third_party/blink/renderer/platform/fonts/font_cache.h"

 #include "base/feature_list.h"

 #include "third_party/blink/public/common/features.h"
 #include "third_party/blink/renderer/platform/font_family_names.h"
 #include "third_party/blink/renderer/platform/fonts/font_description.h"
 #include "third_party/blink/renderer/platform/fonts/font_face_creation_params.h"
 #include "third_party/blink/renderer/platform/fonts/simple_font_data.h"
 #include "third_party/blink/renderer/platform/language.h"
 #include "third_party/skia/include/core/SkFontMgr.h"
 #include "third_party/skia/include/core/SkTypeface.h"

 namespace blink {

 namespace {
 const char kNotoColorEmoji[] = "NotoColorEmoji";
 }

 static AtomicString DefaultFontFamily(sk_sp<SkFontMgr> font_manager) {
   // Pass nullptr to get the default typeface. The default typeface in Android
   // is "sans-serif" if exists, or the first entry in fonts.xml.
   sk_sp<SkTypeface> typeface(
       font_manager->legacyMakeTypeface(nullptr, SkFontStyle()));
   if (typeface) {
     SkString family_name;
     typeface->getFamilyName(&family_name);
     if (family_name.size())
       return ToAtomicString(family_name);
   }

   // Some devices do not return the default typeface. There's not much we can
   // do here, use "Arial", the value LayoutTheme uses for CSS system font
   // keywords such as "menu".
   NOTREACHED();
   return font_family_names::kArial;
 }

 static AtomicString DefaultFontFamily() {
   if (sk_sp<SkFontMgr> font_manager = FontCache::GetFontCache()->FontManager())
     return DefaultFontFamily(font_manager);
   return DefaultFontFamily(SkFontMgr::RefDefault());
 }

 // static
 const AtomicString& FontCache::SystemFontFamily() {
   DEFINE_THREAD_SAFE_STATIC_LOCAL(AtomicString, system_font_family,
                                   (DefaultFontFamily()));
   return system_font_family;
 }

 // static
 void FontCache::SetSystemFontFamily(const AtomicString&) {}

 scoped_refptr<SimpleFontData> FontCache::PlatformFallbackFontForCharacter(
     const FontDescription& font_description,
     UChar32 c,
     const SimpleFontData*,
     FontFallbackPriority fallback_priority) {
   sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());

   AtomicString family_name = GetFamilyNameForCharacter(
       fm.get(), c, font_description, nullptr, fallback_priority);

   // Return the GMS Core emoji font if FontFallbackPriority is kEmojiEmoji and
   // a) no system fallback was found or b) the system fallback font's PostScript
   // name is "Noto Color Emoji" - then we override the system one with the newer
   // one from GMS core if we have it and if it has glyph coverage. This should
   // improves coverage for sequences such as WOMAN FEEDING BABY, which would
   // otherwise get broken down into multiple individual emoji from the
   // potentially older firmware emoji font.  Don't override it if a fallback
   // font for emoji was returned but its PS name is not NotoColorEmoji as we
   // would otherwise always override an OEMs emoji font.

   if (fallback_priority == FontFallbackPriority::kEmojiEmoji &&
       base::FeatureList::IsEnabled(features::kGMSCoreEmoji)) {
     auto skia_fallback_is_noto_color_emoji = [&]() {
       FontPlatformData* skia_fallback_result = GetFontPlatformData(
           font_description, FontFaceCreationParams(family_name));

       // Determining the PostScript name is required as Skia on Android gives
       // synthetic family names such as "91##fallback" to fallback fonts
       // determined (Compare Skia's SkFontMgr_Android::addFamily). In order to
       // identify if really the Emoji font was returned, compare by PostScript
       // name rather than by family.
       SkString fallback_postscript_name;
       if (skia_fallback_result && skia_fallback_result->Typeface()) {
         skia_fallback_result->Typeface()->getPostScriptName(
             &fallback_postscript_name);
       }
       return fallback_postscript_name.equals(kNotoColorEmoji);
     };

     if (family_name.IsEmpty() || skia_fallback_is_noto_color_emoji()) {
       FontPlatformData* emoji_gms_core_font = GetFontPlatformData(
           font_description,
           FontFaceCreationParams(AtomicString(kNotoColorEmojiCompat)));
       if (emoji_gms_core_font) {
         SkTypeface* probe_coverage_typeface = emoji_gms_core_font->Typeface();
         if (probe_coverage_typeface &&
             probe_coverage_typeface->unicharToGlyph(c)) {
           return FontDataFromFontPlatformData(emoji_gms_core_font,
                                               kDoNotRetain);
         }
       }
     }
   }

   // Remaining case, if fallback priority is not emoij or the GMS core emoji
   // font was not found or an OEM emoji font was not to be overridden.

   if (family_name.IsEmpty())
     return GetLastResortFallbackFont(font_description, kDoNotRetain);

   return FontDataFromFontPlatformData(
       GetFontPlatformData(font_description,
                           FontFaceCreationParams(family_name)),
       kDoNotRetain);
 }

 // static
 AtomicString FontCache::GetGenericFamilyNameForScript(
     const AtomicString& family_name,
     const FontDescription& font_description) {
   // If monospace, do not apply CJK hack to find i18n fonts, because
   // i18n fonts are likely not monospace. Monospace is mostly used
   // for code, but when i18n characters appear in monospace, system
   // fallback can still render the characters.
   if (family_name == font_family_names::kWebkitMonospace)
     return family_name;

   // The CJK hack below should be removed, at latest when we have
   // serif and sans-serif versions of CJK fonts. Until then, limit it
   // to only when the content locale is available. crbug.com/652146
   const LayoutLocale* content_locale = font_description.Locale();
   if (!content_locale)
     return family_name;

   // This is a hack to use the preferred font for CJK scripts.
   // TODO(kojii): This logic disregards either generic family name
   // or locale. We need an API that honors both to find appropriate
   // fonts. crbug.com/642340
   UChar32 exampler_char;
   switch (content_locale->GetScript()) {
     case USCRIPT_SIMPLIFIED_HAN:
     case USCRIPT_TRADITIONAL_HAN:
     case USCRIPT_KATAKANA_OR_HIRAGANA:
       exampler_char = 0x4E00;  // A common character in Japanese and Chinese.
       break;
     case USCRIPT_HANGUL:
       exampler_char = 0xAC00;
       break;
     default:
       // For other scripts, use the default generic family mapping logic.
       return family_name;
   }

   sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
   return GetFamilyNameForCharacter(fm.get(), exampler_char, font_description,
                                    nullptr, FontFallbackPriority::kText);
 }

 }  // namespace blink
	/*
	* Copyright (c) 2011 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:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * 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.
	* * 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.
	*/

	#include "third_party/blink/renderer/platform/fonts/font_cache.h"

	#include "base/feature_list.h"

	#include "third_party/blink/public/common/features.h"
	#include "third_party/blink/renderer/platform/font_family_names.h"
	#include "third_party/blink/renderer/platform/fonts/font_description.h"
	#include "third_party/blink/renderer/platform/fonts/font_face_creation_params.h"
	#include "third_party/blink/renderer/platform/fonts/simple_font_data.h"
	#include "third_party/blink/renderer/platform/language.h"
	#include "third_party/skia/include/core/SkFontMgr.h"
	#include "third_party/skia/include/core/SkTypeface.h"

	namespace blink {

	namespace {
	const char kNotoColorEmoji[] = "NotoColorEmoji";
	}

	static AtomicString DefaultFontFamily(sk_sp<SkFontMgr> font_manager) {
	// Pass nullptr to get the default typeface. The default typeface in Android
	// is "sans-serif" if exists, or the first entry in fonts.xml.
	sk_sp<SkTypeface> typeface(
	font_manager->legacyMakeTypeface(nullptr, SkFontStyle()));
	if (typeface) {
	SkString family_name;
	typeface->getFamilyName(&family_name);
	if (family_name.size())
	return ToAtomicString(family_name);
	}

	// Some devices do not return the default typeface. There's not much we can
	// do here, use "Arial", the value LayoutTheme uses for CSS system font
	// keywords such as "menu".
	NOTREACHED();
	return font_family_names::kArial;
	}

	static AtomicString DefaultFontFamily() {
	if (sk_sp<SkFontMgr> font_manager = FontCache::GetFontCache()->FontManager())
	return DefaultFontFamily(font_manager);
	return DefaultFontFamily(SkFontMgr::RefDefault());
	}

	// static
	const AtomicString& FontCache::SystemFontFamily() {
	DEFINE_THREAD_SAFE_STATIC_LOCAL(AtomicString, system_font_family,
	(DefaultFontFamily()));
	return system_font_family;
	}

	// static
	void FontCache::SetSystemFontFamily(const AtomicString&) {}

	scoped_refptr<SimpleFontData> FontCache::PlatformFallbackFontForCharacter(
	const FontDescription& font_description,
	UChar32 c,
	const SimpleFontData*,
	FontFallbackPriority fallback_priority) {
	sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());

	AtomicString family_name = GetFamilyNameForCharacter(
	fm.get(), c, font_description, nullptr, fallback_priority);

	// Return the GMS Core emoji font if FontFallbackPriority is kEmojiEmoji and
	// a) no system fallback was found or b) the system fallback font's PostScript
	// name is "Noto Color Emoji" - then we override the system one with the newer
	// one from GMS core if we have it and if it has glyph coverage. This should
	// improves coverage for sequences such as WOMAN FEEDING BABY, which would
	// otherwise get broken down into multiple individual emoji from the
	// potentially older firmware emoji font. Don't override it if a fallback
	// font for emoji was returned but its PS name is not NotoColorEmoji as we
	// would otherwise always override an OEMs emoji font.

	if (fallback_priority == FontFallbackPriority::kEmojiEmoji &&
	base::FeatureList::IsEnabled(features::kGMSCoreEmoji)) {
	auto skia_fallback_is_noto_color_emoji = [&]() {
	FontPlatformData* skia_fallback_result = GetFontPlatformData(
	font_description, FontFaceCreationParams(family_name));

	// Determining the PostScript name is required as Skia on Android gives
	// synthetic family names such as "91##fallback" to fallback fonts
	// determined (Compare Skia's SkFontMgr_Android::addFamily). In order to
	// identify if really the Emoji font was returned, compare by PostScript
	// name rather than by family.
	SkString fallback_postscript_name;
	if (skia_fallback_result && skia_fallback_result->Typeface()) {
	skia_fallback_result->Typeface()->getPostScriptName(
	&fallback_postscript_name);
	}
	return fallback_postscript_name.equals(kNotoColorEmoji);
	};

	if (family_name.IsEmpty() \|\| skia_fallback_is_noto_color_emoji()) {
	FontPlatformData* emoji_gms_core_font = GetFontPlatformData(
	font_description,
	FontFaceCreationParams(AtomicString(kNotoColorEmojiCompat)));
	if (emoji_gms_core_font) {
	SkTypeface* probe_coverage_typeface = emoji_gms_core_font->Typeface();
	if (probe_coverage_typeface &&
	probe_coverage_typeface->unicharToGlyph(c)) {
	return FontDataFromFontPlatformData(emoji_gms_core_font,
	kDoNotRetain);
	}
	}
	}
	}

	// Remaining case, if fallback priority is not emoij or the GMS core emoji
	// font was not found or an OEM emoji font was not to be overridden.

	if (family_name.IsEmpty())
	return GetLastResortFallbackFont(font_description, kDoNotRetain);

	return FontDataFromFontPlatformData(
	GetFontPlatformData(font_description,
	FontFaceCreationParams(family_name)),
	kDoNotRetain);
	}

	// static
	AtomicString FontCache::GetGenericFamilyNameForScript(
	const AtomicString& family_name,
	const FontDescription& font_description) {
	// If monospace, do not apply CJK hack to find i18n fonts, because
	// i18n fonts are likely not monospace. Monospace is mostly used
	// for code, but when i18n characters appear in monospace, system
	// fallback can still render the characters.
	if (family_name == font_family_names::kWebkitMonospace)
	return family_name;

	// The CJK hack below should be removed, at latest when we have
	// serif and sans-serif versions of CJK fonts. Until then, limit it
	// to only when the content locale is available. crbug.com/652146
	const LayoutLocale* content_locale = font_description.Locale();
	if (!content_locale)
	return family_name;

	// This is a hack to use the preferred font for CJK scripts.
	// TODO(kojii): This logic disregards either generic family name
	// or locale. We need an API that honors both to find appropriate
	// fonts. crbug.com/642340
	UChar32 exampler_char;
	switch (content_locale->GetScript()) {
	case USCRIPT_SIMPLIFIED_HAN:
	case USCRIPT_TRADITIONAL_HAN:
	case USCRIPT_KATAKANA_OR_HIRAGANA:
	exampler_char = 0x4E00; // A common character in Japanese and Chinese.
	break;
	case USCRIPT_HANGUL:
	exampler_char = 0xAC00;
	break;
	default:
	// For other scripts, use the default generic family mapping logic.
	return family_name;
	}

	sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
	return GetFamilyNameForCharacter(fm.get(), exampler_char, font_description,
	nullptr, FontFallbackPriority::kText);
	}

	} // namespace blink