1 /* 2 * Copyright (C) 2013 Google, Inc. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 * 19 */ 20 21 #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSS_CUSTOM_FONT_DATA_H_ 22 #define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSS_CUSTOM_FONT_DATA_H_ 23 24 #include "third_party/blink/renderer/core/css/css_font_face_source.h" 25 #include "third_party/blink/renderer/platform/fonts/custom_font_data.h" 26 #include "third_party/blink/renderer/platform/heap/persistent.h" 27 28 namespace blink { 29 30 class CSSCustomFontData final : public CustomFontData { 31 public: 32 enum FallbackVisibility { kInvisibleFallback, kVisibleFallback }; 33 Create(CSSFontFaceSource * source,FallbackVisibility visibility)34 static scoped_refptr<CSSCustomFontData> Create( 35 CSSFontFaceSource* source, 36 FallbackVisibility visibility) { 37 return base::AdoptRef(new CSSCustomFontData(source, visibility)); 38 } 39 40 ~CSSCustomFontData() override = default; 41 ShouldSkipDrawing()42 bool ShouldSkipDrawing() const override { 43 if (font_face_source_) 44 font_face_source_->PaintRequested(); 45 return fallback_visibility_ == kInvisibleFallback && is_loading_; 46 } 47 BeginLoadIfNeeded()48 void BeginLoadIfNeeded() const override { 49 if (!is_loading_ && font_face_source_) { 50 is_loading_ = true; 51 font_face_source_->BeginLoadIfNeeded(); 52 } 53 } 54 IsLoading()55 bool IsLoading() const override { return is_loading_; } IsLoadingFallback()56 bool IsLoadingFallback() const override { return true; } ClearFontFaceSource()57 void ClearFontFaceSource() override { font_face_source_ = nullptr; } 58 59 private: CSSCustomFontData(CSSFontFaceSource * source,FallbackVisibility visibility)60 CSSCustomFontData(CSSFontFaceSource* source, FallbackVisibility visibility) 61 : font_face_source_(source), 62 fallback_visibility_(visibility), 63 is_loading_(false) { 64 if (source) 65 is_loading_ = source->IsLoading(); 66 } 67 68 // TODO(Oilpan): consider moving (Custom)FontFace hierarchy to the heap, 69 // thereby making this reference a Member<>. 70 WeakPersistent<CSSFontFaceSource> font_face_source_; 71 FallbackVisibility fallback_visibility_; 72 mutable bool is_loading_; 73 }; 74 75 } // namespace blink 76 77 #endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSS_CUSTOM_FONT_DATA_H_ 78