gfx/layers/CopyableCanvasLayer.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef GFX_COPYABLECANVASLAYER_H
   7 #define GFX_COPYABLECANVASLAYER_H
   8
   9 #include <stdint.h>                     // for uint32_t
  10 #include "GLContextTypes.h"             // for GLContext
  11 #include "Layers.h"                     // for CanvasLayer, etc
  12 #include "gfxContext.h"                 // for gfxContext, etc
  13 #include "gfxTypes.h"
  14 #include "gfxPlatform.h"                // for gfxImageFormat
  15 #include "mozilla/Assertions.h"         // for MOZ_ASSERT, etc
  16 #include "mozilla/Preferences.h"        // for Preferences
  17 #include "mozilla/RefPtr.h"             // for RefPtr
  18 #include "mozilla/gfx/2D.h"             // for DrawTarget
  19 #include "mozilla/mozalloc.h"           // for operator delete, etc
  20 #include "nsAutoPtr.h"                  // for nsRefPtr
  21 #include "nsISupportsImpl.h"            // for MOZ_COUNT_CTOR, etc
  22
  23 namespace mozilla {
  24 namespace gl{
  25 class SurfaceStream;
  26 }
  27
  28 namespace layers {
  29
  30 class CanvasClientWebGL;
  31
  32 /**
  33  * A shared CanvasLayer implementation that supports copying
  34  * its contents into a gfxASurface using UpdateSurface.
  35  */
  36 class CopyableCanvasLayer : public CanvasLayer
  37 {
  38 public:
  39   CopyableCanvasLayer(LayerManager* aLayerManager, void *aImplData);
  40
  41 protected:
  42   virtual ~CopyableCanvasLayer();
  43
  44 public:
  45   virtual void Initialize(const Data& aData);
  46
  47   virtual bool IsDataValid(const Data& aData);
  48
  49   bool IsGLLayer() { return !!mGLContext; }
  50
  51 protected:
  52   void UpdateTarget(gfx::DrawTarget* aDestTarget = nullptr);
  53
  54   RefPtr<gfx::SourceSurface> mSurface;
  55   nsRefPtr<gl::GLContext> mGLContext;
  56   mozilla::RefPtr<mozilla::gfx::DrawTarget> mDrawTarget;
  57
  58   RefPtr<gl::SurfaceStream> mStream;
  59
  60   uint32_t mCanvasFramebuffer;
  61
  62   bool mIsAlphaPremultiplied;
  63   bool mNeedsYFlip;
  64
  65   RefPtr<gfx::DataSourceSurface> mCachedTempSurface;
  66
  67   gfx::DataSourceSurface* GetTempSurface(const gfx::IntSize& aSize,
  68                                          const gfx::SurfaceFormat aFormat);
  69
  70   void DiscardTempSurface();
  71 };
  72
  73 }
  74 }
  75
  76 #endif