/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef Canvas2DLayerBridge_h
#define Canvas2DLayerBridge_h

#include "cc/layers/texture_layer_client.h"
#include "cc/resources/texture_mailbox.h"
#include "platform/PlatformExport.h"
#include "platform/geometry/IntSize.h"
#include "platform/graphics/ImageBufferSurface.h"
#include "public/platform/WebExternalTextureLayer.h"
#include "public/platform/WebThread.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "third_party/skia/include/core/SkSurface.h"
#include "wtf/Allocator.h"
#include "wtf/Deque.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"
#include "wtf/WeakPtr.h"
#include <memory>

class SkImage;
struct SkImageInfo;
class SkPictureRecorder;

namespace gpu {
namespace gles2 {
class GLES2Interface;
}
}

namespace blink {

class Canvas2DLayerBridgeHistogramLogger;
class Canvas2DLayerBridgeTest;
class ImageBuffer;
class WebGraphicsContext3DProvider;
class SharedContextRateLimiter;

#if OS(MACOSX)
// Canvas hibernation is currently disabled on MacOS X due to a bug that causes
// content loss. TODO: Find a better fix for crbug.com/588434
#define CANVAS2D_HIBERNATION_ENABLED 0

// IOSurfaces are a primitive only present on OS X.
#define USE_IOSURFACE_FOR_2D_CANVAS 1
#else
#define CANVAS2D_HIBERNATION_ENABLED 1
#define USE_IOSURFACE_FOR_2D_CANVAS 0
#endif

// TODO: Fix background rendering and remove this workaround. crbug.com/600386
#define CANVAS2D_BACKGROUND_RENDER_SWITCH_TO_CPU 0

class PLATFORM_EXPORT Canvas2DLayerBridge
    : public NON_EXPORTED_BASE(cc::TextureLayerClient),
      public WebThread::TaskObserver,
      public RefCounted<Canvas2DLayerBridge> {
  WTF_MAKE_NONCOPYABLE(Canvas2DLayerBridge);

 public:
  enum AccelerationMode {
    DisableAcceleration,
    EnableAcceleration,
    ForceAccelerationForTesting,
  };

  Canvas2DLayerBridge(std::unique_ptr<WebGraphicsContext3DProvider>,
                      const IntSize&,
                      int msaaSampleCount,
                      OpacityMode,
                      AccelerationMode,
                      sk_sp<SkColorSpace>);

  ~Canvas2DLayerBridge() override;

  // cc::TextureLayerClient implementation.
  bool PrepareTextureMailbox(
      cc::TextureMailbox* outMailbox,
      std::unique_ptr<cc::SingleReleaseCallback>* outReleaseCallback) override;

  // Callback for mailboxes given to the compositor from PrepareTextureMailbox.
  void mailboxReleased(const gpu::Mailbox&,
                       const gpu::SyncToken&,
                       bool lostResource);

  // ImageBufferSurface implementation
  void finalizeFrame(const FloatRect& dirtyRect);
  void willWritePixels();
  void willOverwriteAllPixels();
  void willOverwriteCanvas();
  SkCanvas* canvas();
  void disableDeferral(DisableDeferralReason);
  bool checkSurfaceValid();
  bool restoreSurface();
  WebLayer* layer() const;
  bool isAccelerated() const;
  void setFilterQuality(SkFilterQuality);
  void setIsHidden(bool);
  void setImageBuffer(ImageBuffer*);
  void didDraw(const FloatRect&);
  bool writePixels(const SkImageInfo&,
                   const void* pixels,
                   size_t rowBytes,
                   int x,
                   int y);
  void flush();
  void flushGpu();
  void prepareSurfaceForPaintingIfNeeded();
  bool isHidden() { return m_isHidden; }
  OpacityMode opacityMode() { return m_opacityMode; }
  void dontUseIdleSchedulingForTesting() {
    m_dontUseIdleSchedulingForTesting = true;
  }

  void beginDestruction();
  void hibernate();
  bool isHibernating() const { return m_hibernationImage.get(); }
  sk_sp<SkColorSpace> colorSpace() const { return m_colorSpace; }

  sk_sp<SkImage> newImageSnapshot(AccelerationHint, SnapshotReason);

  // The values of the enum entries must not change because they are used for
  // usage metrics histograms. New values can be added to the end.
  enum HibernationEvent {
    HibernationScheduled = 0,
    HibernationAbortedDueToDestructionWhileHibernatePending = 1,
    HibernationAbortedDueToPendingDestruction = 2,
    HibernationAbortedDueToVisibilityChange = 3,
    HibernationAbortedDueGpuContextLoss = 4,
    HibernationAbortedDueToSwitchToUnacceleratedRendering = 5,
    HibernationAbortedDueToAllocationFailure = 6,
    HibernationEndedNormally = 7,
    HibernationEndedWithSwitchToBackgroundRendering = 8,
    HibernationEndedWithFallbackToSW = 9,
    HibernationEndedWithTeardown = 10,
    HibernationAbortedBecauseNoSurface = 11,

    HibernationEventCount = 12,
  };

  class PLATFORM_EXPORT Logger {
   public:
    virtual void reportHibernationEvent(HibernationEvent);
    virtual void didStartHibernating() {}
    virtual ~Logger() {}
  };

  void setLoggerForTesting(std::unique_ptr<Logger>);

 private:
#if USE_IOSURFACE_FOR_2D_CANVAS
  // All information associated with a CHROMIUM image.
  struct ImageInfo;
#endif  // USE_IOSURFACE_FOR_2D_CANVAS

  struct MailboxInfo {
    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
    gpu::Mailbox m_mailbox;
    sk_sp<SkImage> m_image;
    RefPtr<Canvas2DLayerBridge> m_parentLayerBridge;

#if USE_IOSURFACE_FOR_2D_CANVAS
    // If this mailbox wraps an IOSurface-backed texture, the ids of the
    // CHROMIUM image and the texture.
    RefPtr<ImageInfo> m_imageInfo;
#endif  // USE_IOSURFACE_FOR_2D_CANVAS

    MailboxInfo(const MailboxInfo&);
    MailboxInfo();
  };

  gpu::gles2::GLES2Interface* contextGL();
  void startRecording();
  void skipQueuedDrawCommands();
  void flushRecordingOnly();
  void unregisterTaskObserver();
  void reportSurfaceCreationFailure();

  // WebThread::TaskOberver implementation
  void willProcessTask() override;
  void didProcessTask() override;

  SkSurface* getOrCreateSurface(AccelerationHint = PreferAcceleration);
  bool shouldAccelerate(AccelerationHint) const;

  // Returns the GL filter associated with |m_filterQuality|.
  GLenum getGLFilter();

#if USE_IOSURFACE_FOR_2D_CANVAS
  // Creates an IOSurface-backed texture. Copies |image| into the texture.
  // Prepares a mailbox from the texture. The caller must have created a new
  // MailboxInfo, and prepended it to |m_mailboxs|. Returns whether the
  // mailbox was successfully prepared. |mailbox| is an out parameter only
  // populated on success.
  bool prepareIOSurfaceMailboxFromImage(SkImage*, cc::TextureMailbox*);

  // Creates an IOSurface-backed texture. Returns an ImageInfo, which is empty
  // on failure. The caller takes ownership of both the texture and the image.
  RefPtr<ImageInfo> createIOSurfaceBackedTexture();

  // Releases all resources associated with a CHROMIUM image.
  void deleteCHROMIUMImage(RefPtr<ImageInfo>);

  // Releases all resources in the CHROMIUM image cache.
  void clearCHROMIUMImageCache();
#endif  // USE_IOSURFACE_FOR_2D_CANVAS

  // Prepends a new MailboxInfo object to |m_mailboxes|.
  void createMailboxInfo();

  // Returns whether the mailbox was successfully prepared from the SkImage.
  // The mailbox is an out parameter only populated on success.
  bool prepareMailboxFromImage(sk_sp<SkImage>, cc::TextureMailbox*);

  // Resets Skia's texture bindings. This method should be called after
  // changing texture bindings.
  void resetSkiaTextureBinding();

  std::unique_ptr<SkPictureRecorder> m_recorder;
  sk_sp<SkSurface> m_surface;
  sk_sp<SkImage> m_hibernationImage;
  int m_initialSurfaceSaveCount;
  std::unique_ptr<WebExternalTextureLayer> m_layer;
  std::unique_ptr<WebGraphicsContext3DProvider> m_contextProvider;
  std::unique_ptr<SharedContextRateLimiter> m_rateLimiter;
  std::unique_ptr<Logger> m_logger;
  WeakPtrFactory<Canvas2DLayerBridge> m_weakPtrFactory;
  ImageBuffer* m_imageBuffer;
  int m_msaaSampleCount;
  size_t m_bytesAllocated;
  bool m_haveRecordedDrawCommands;
  bool m_destructionInProgress;
  SkFilterQuality m_filterQuality;
  bool m_isHidden;
  bool m_isDeferralEnabled;
  bool m_isRegisteredTaskObserver;
  bool m_renderingTaskCompletedForCurrentFrame;
  bool m_softwareRenderingWhileHidden;
  bool m_surfaceCreationFailedAtLeastOnce = false;
  bool m_hibernationScheduled = false;
  bool m_dontUseIdleSchedulingForTesting = false;

  friend class Canvas2DLayerBridgeTest;
  friend class CanvasRenderingContext2DTest;
  friend class HTMLCanvasPainterTestForSPv2;

  uint32_t m_lastImageId;

  enum {
    // We should normally not have more that two active mailboxes at a time,
    // but sometimes we may have three due to the async nature of mailbox
    // handling.
    MaxActiveMailboxes = 3,
  };

  Deque<MailboxInfo, MaxActiveMailboxes> m_mailboxes;
  GLenum m_lastFilter;
  AccelerationMode m_accelerationMode;
  OpacityMode m_opacityMode;
  const IntSize m_size;
  sk_sp<SkColorSpace> m_colorSpace;
  int m_recordingPixelCount;

#if USE_IOSURFACE_FOR_2D_CANVAS
  // Each element in this vector represents an IOSurface backed texture that
  // is ready to be reused.
  // Elements in this vector can safely be purged in low memory conditions.
  Vector<RefPtr<ImageInfo>> m_imageInfoCache;
#endif  // USE_IOSURFACE_FOR_2D_CANVAS
};

}  // namespace blink

#endif