third_party/WebKit/Source/web/WebGraphicsContextImpl.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef WebGraphicsContextImpl_h
   6 #define WebGraphicsContextImpl_h
   7
   8 #include "platform/graphics/paint/DisplayItem.h"
   9 #include "platform/graphics/paint/DisplayItemClient.h"
  10 #include "public/web/WebGraphicsContext.h"
  11 #include "wtf/OwnPtr.h"
  12
  13 namespace blink {
  14
  15 class DrawingRecorder;
  16 class GraphicsContext;
  17
  18 // Wraps a blink::GraphicsContext.
  19 // Internal consumers can extract the underlying context (via WebGraphicsContextImpl).
  20 // External consumers can make a single drawing using a WebCanvas.
  21 class WebGraphicsContextImpl : public WebGraphicsContext {
  22 public:
  23     WebGraphicsContextImpl(GraphicsContext&, const DisplayItemClientWrapper&, DisplayItem::Type);
  24     ~WebGraphicsContextImpl();
  25     GraphicsContext& graphicsContext() { return m_graphicsContext; }
  26
  27     // blink::WebGraphicsContext
  28     WebCanvas* beginDrawing(const WebFloatRect& bounds) override;
  29     void endDrawing() override;
  30
  31 private:
  32     GraphicsContext& m_graphicsContext;
  33     DisplayItemClientWrapper m_client;
  34     DisplayItem::Type m_type;
  35     OwnPtr<DrawingRecorder> m_drawingRecorder;
  36 #ifndef NDEBUG
  37     bool m_hasBegunDrawing;
  38 #endif
  39 };
  40
  41 // Source/web/ assumes that WebGraphicsContextImpl is the only implementation.
  42 DEFINE_TYPE_CASTS(WebGraphicsContextImpl, WebGraphicsContext, webGraphicsContext, true, true);
  43
  44 } // namespace blink
  45
  46 #endif