third_party/WebKit/Source/core/css/CSSCustomFontData.h

   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 CSSCustomFontData_h
  22 #define CSSCustomFontData_h
  23
  24 #include "core/css/CSSFontFaceSource.h"
  25 #include "platform/fonts/CustomFontData.h"
  26
  27 namespace blink {
  28
  29 class CSSCustomFontData final : public CustomFontData {
  30 public:
  31     enum FallbackVisibility { InvisibleFallback, VisibleFallback };
  32
  33     static PassRefPtr<CSSCustomFontData> create(RemoteFontFaceSource* source, FallbackVisibility visibility)
  34     {
  35         return adoptRef(new CSSCustomFontData(source, visibility));
  36     }
  37
  38     ~CSSCustomFontData() override { }
  39
  40     bool shouldSkipDrawing() const override
  41     {
  42         if (m_fontFaceSource)
  43             m_fontFaceSource->paintRequested();
  44         return m_fallbackVisibility == InvisibleFallback && m_isLoading;
  45     }
  46
  47     void beginLoadIfNeeded() const override
  48     {
  49         if (!m_isLoading && m_fontFaceSource) {
  50             m_isLoading = true;
  51             m_fontFaceSource->beginLoadIfNeeded();
  52         }
  53     }
  54
  55     bool isLoading() const override { return m_isLoading; }
  56     bool isLoadingFallback() const override { return true; }
  57     void clearFontFaceSource() override { m_fontFaceSource = 0; }
  58
  59 private:
  60     CSSCustomFontData(RemoteFontFaceSource* source, FallbackVisibility visibility)
  61         : m_fontFaceSource(source)
  62         , m_fallbackVisibility(visibility)
  63         , m_isLoading(false)
  64     {
  65         if (source)
  66             m_isLoading = source->isLoading();
  67     }
  68
  69     RemoteFontFaceSource* m_fontFaceSource;
  70     FallbackVisibility m_fallbackVisibility;
  71     mutable bool m_isLoading;
  72 };
  73
  74 }
  75
  76 #endif // CSSCustomFontData_h