gfx/2d/SourceSurfaceSkia.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef MOZILLA_GFX_SOURCESURFACESKIA_H_
   8 #define MOZILLA_GFX_SOURCESURFACESKIA_H_
   9
  10 #include "2D.h"
  11 #include <vector>
  12 #include "mozilla/Mutex.h"
  13 #include "skia/include/core/SkCanvas.h"
  14 #include "skia/include/core/SkImage.h"
  15
  16 namespace mozilla {
  17
  18 namespace gfx {
  19
  20 class DrawTargetSkia;
  21 class SnapshotLock;
  22
  23 class SourceSurfaceSkia : public DataSourceSurface {
  24  public:
  25   MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(DataSourceSurfaceSkia, override)
  26
  27   SourceSurfaceSkia();
  28   virtual ~SourceSurfaceSkia();
  29
  30   SurfaceType GetType() const override { return SurfaceType::SKIA; }
  31   IntSize GetSize() const override;
  32   SurfaceFormat GetFormat() const override;
  33
  34   // This is only ever called by the DT destructor, which can only ever happen
  35   // from one place at a time. Therefore it doesn't need to hold the ChangeMutex
  36   // as mSurface is never read to directly and is just there to keep the object
  37   // alive, which itself is refcounted in a thread-safe manner.
  38   void GiveSurface(sk_sp<SkSurface>& aSurface) {
  39     mSurface = aSurface;
  40     mDrawTarget = nullptr;
  41   }
  42
  43   sk_sp<SkImage> GetImage();
  44
  45   bool InitFromData(unsigned char* aData, const IntSize& aSize, int32_t aStride,
  46                     SurfaceFormat aFormat);
  47
  48   bool InitFromImage(const sk_sp<SkImage>& aImage,
  49                      SurfaceFormat aFormat = SurfaceFormat::UNKNOWN,
  50                      DrawTargetSkia* aOwner = nullptr);
  51
  52   uint8_t* GetData() override;
  53
  54   /**
  55    * The caller is responsible for ensuring aMappedSurface is not null.
  56    */
  57   bool Map(MapType, MappedSurface* aMappedSurface) override;
  58
  59   void Unmap() override;
  60
  61   int32_t Stride() override { return mStride; }
  62
  63  private:
  64   friend class DrawTargetSkia;
  65
  66   void DrawTargetWillChange();
  67
  68   sk_sp<SkImage> mImage;
  69   // This keeps a surface alive if needed because its DrawTarget has gone away.
  70   sk_sp<SkSurface> mSurface;
  71   SurfaceFormat mFormat;
  72   IntSize mSize;
  73   int32_t mStride;
  74   DrawTargetSkia* mDrawTarget;
  75   Mutex mChangeMutex;
  76   bool mIsMapped;
  77 };
  78
  79 }  // namespace gfx
  80 }  // namespace mozilla
  81
  82 #endif /* MOZILLA_GFX_SOURCESURFACESKIA_H_ */