image/DecodedSurfaceProvider.h
author Sebastian Hengst <archaeopteryx@coole-files.de>
Thu, 23 Mar 2017 22:00:26 +0100
changeset 349193 160438b0f0f8d5e463a7f2a0bbb7f3412f7e5f42
parent 311508 8f8d3c106410aed2252be6180c542aef3b8ad738
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Backed out changeset 9c1ee3920ea3 (bug 1345119)

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/**
 * An ISurfaceProvider implemented for single-frame decoded surfaces.
 */

#ifndef mozilla_image_DecodedSurfaceProvider_h
#define mozilla_image_DecodedSurfaceProvider_h

#include "IDecodingTask.h"
#include "ISurfaceProvider.h"
#include "SurfaceCache.h"

namespace mozilla {
namespace image {

/**
 * An ISurfaceProvider that manages the decoding of a single-frame image and
 * stores the resulting surface.
 */
class DecodedSurfaceProvider final
  : public ISurfaceProvider
  , public IDecodingTask
{
public:
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DecodedSurfaceProvider, override)

  DecodedSurfaceProvider(NotNull<RasterImage*> aImage,
                         const SurfaceKey& aSurfaceKey,
                         NotNull<Decoder*> aDecoder);


  //////////////////////////////////////////////////////////////////////////////
  // ISurfaceProvider implementation.
  //////////////////////////////////////////////////////////////////////////////

public:
  bool IsFinished() const override;
  size_t LogicalSizeInBytes() const override;

protected:
  DrawableFrameRef DrawableRef(size_t aFrame) override;
  bool IsLocked() const override { return bool(mLockRef); }
  void SetLocked(bool aLocked) override;


  //////////////////////////////////////////////////////////////////////////////
  // IDecodingTask implementation.
  //////////////////////////////////////////////////////////////////////////////

public:
  void Run() override;
  bool ShouldPreferSyncRun() const override;

  // Full decodes are low priority compared to metadata decodes because they
  // don't block layout or page load.
  TaskPriority Priority() const override { return TaskPriority::eLow; }


private:
  virtual ~DecodedSurfaceProvider();

  void DropImageReference();
  void CheckForNewSurface();
  void FinishDecoding();

  /// The image associated with our decoder. Dropped after decoding.
  RefPtr<RasterImage> mImage;

  /// Mutex protecting access to mDecoder.
  Mutex mMutex;

  /// The decoder that will generate our surface. Dropped after decoding.
  RefPtr<Decoder> mDecoder;

  /// Our surface. Initially null until it's generated by the decoder.
  RefPtr<imgFrame> mSurface;

  /// A drawable reference to our service; used for locking.
  DrawableFrameRef mLockRef;
};

} // namespace image
} // namespace mozilla

#endif // mozilla_image_DecodedSurfaceProvider_h