1 files changed, 422 insertions, 0 deletions
diff --git a/image/imgFrame.h b/image/imgFrame.h
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+++ b/image/imgFrame.h
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+/* -*- 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/. */
+
+#ifndef mozilla_image_imgFrame_h
+#define mozilla_image_imgFrame_h
+
+#include <functional>
+#include <utility>
+
+#include "AnimationParams.h"
+#include "MainThreadUtils.h"
+#include "gfxDrawable.h"
+#include "mozilla/layers/SourceSurfaceSharedData.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Monitor.h"
+#include "nsRect.h"
+
+namespace mozilla {
+namespace image {
+
+class ImageRegion;
+class DrawableFrameRef;
+class RawAccessFrameRef;
+
+enum class Opacity : uint8_t { FULLY_OPAQUE, SOME_TRANSPARENCY };
+
+class imgFrame {
+  typedef gfx::SourceSurfaceSharedData SourceSurfaceSharedData;
+  typedef gfx::DrawTarget DrawTarget;
+  typedef gfx::SamplingFilter SamplingFilter;
+  typedef gfx::IntPoint IntPoint;
+  typedef gfx::IntRect IntRect;
+  typedef gfx::IntSize IntSize;
+  typedef gfx::SourceSurface SourceSurface;
+  typedef gfx::SurfaceFormat SurfaceFormat;
+
+ public:
+  MOZ_DECLARE_REFCOUNTED_TYPENAME(imgFrame)
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(imgFrame)
+
+  imgFrame();
+
+  /**
+   * Initialize this imgFrame with an empty surface and prepare it for being
+   * written to by a decoder.
+   *
+   * This is appropriate for use with decoded images, but it should not be used
+   * when drawing content into an imgFrame, as it may use a different graphics
+   * backend than normal content drawing.
+   */
+  nsresult InitForDecoder(const nsIntSize& aImageSize, SurfaceFormat aFormat,
+                          bool aNonPremult,
+                          const Maybe<AnimationParams>& aAnimParams,
+                          bool aShouldRecycle);
+
+  /**
+   * Reinitialize this imgFrame with the new parameters, but otherwise retain
+   * the underlying buffer.
+   *
+   * This is appropriate for use with animated images, where the decoder was
+   * given an IDecoderFrameRecycler object which may yield a recycled imgFrame
+   * that was discarded to save memory.
+   */
+  nsresult InitForDecoderRecycle(const AnimationParams& aAnimParams);
+
+  /**
+   * Initialize this imgFrame with a new surface and draw the provided
+   * gfxDrawable into it.
+   *
+   * This is appropriate to use when drawing content into an imgFrame, as it
+   * uses the same graphics backend as normal content drawing. The downside is
+   * that the underlying surface may not be stored in a volatile buffer on all
+   * platforms, and raw access to the surface (using RawAccessRef()) may be much
+   * more expensive than in the InitForDecoder() case.
+   *
+   * aBackend specifies the DrawTarget backend type this imgFrame is supposed
+   *          to be drawn to.
+   */
+  nsresult InitWithDrawable(gfxDrawable* aDrawable, const nsIntSize& aSize,
+                            const SurfaceFormat aFormat,
+                            SamplingFilter aSamplingFilter,
+                            uint32_t aImageFlags, gfx::BackendType aBackend);
+
+  DrawableFrameRef DrawableRef();
+
+  /**
+   * Create a RawAccessFrameRef for the frame.
+   */
+  RawAccessFrameRef RawAccessRef();
+
+  bool Draw(gfxContext* aContext, const ImageRegion& aRegion,
+            SamplingFilter aSamplingFilter, uint32_t aImageFlags,
+            float aOpacity);
+
+  nsresult ImageUpdated(const nsIntRect& aUpdateRect);
+
+  /**
+   * Mark this imgFrame as completely decoded, and set final options.
+   *
+   * You must always call either Finish() or Abort() before releasing the last
+   * RawAccessFrameRef pointing to an imgFrame.
+   *
+   * @param aFrameOpacity    Whether this imgFrame is opaque.
+   * @param aFinalize        Finalize the underlying surface (e.g. so that it
+   *                         may be marked as read only if possible).
+   */
+  void Finish(Opacity aFrameOpacity = Opacity::SOME_TRANSPARENCY,
+              bool aFinalize = true,
+              bool aOrientationSwapsWidthAndHeight = false);
+
+  /**
+   * Mark this imgFrame as aborted. This informs the imgFrame that if it isn't
+   * completely decoded now, it never will be.
+   *
+   * You must always call either Finish() or Abort() before releasing the last
+   * RawAccessFrameRef pointing to an imgFrame.
+   */
+  void Abort();
+
+  /**
+   * Returns true if this imgFrame has been aborted.
+   */
+  bool IsAborted() const;
+
+  /**
+   * Returns true if this imgFrame is completely decoded.
+   */
+  bool IsFinished() const;
+
+  /**
+   * Blocks until this imgFrame is either completely decoded, or is marked as
+   * aborted.
+   *
+   * Note that calling this on the main thread _blocks the main thread_. Be very
+   * careful in your use of this method to avoid excessive main thread jank or
+   * deadlock.
+   */
+  void WaitUntilFinished() const;
+
+  /**
+   * Returns the number of bytes per pixel this imgFrame requires.
+   */
+  uint32_t GetBytesPerPixel() const { return 4; }
+
+  const IntSize& GetSize() const { return mImageSize; }
+  IntRect GetRect() const { return IntRect(IntPoint(0, 0), mImageSize); }
+  const IntRect& GetBlendRect() const { return mBlendRect; }
+  IntRect GetBoundedBlendRect() const {
+    return mBlendRect.Intersect(GetRect());
+  }
+  nsIntRect GetDecodedRect() const {
+    MonitorAutoLock lock(mMonitor);
+    return mDecoded;
+  }
+  FrameTimeout GetTimeout() const { return mTimeout; }
+  BlendMethod GetBlendMethod() const { return mBlendMethod; }
+  DisposalMethod GetDisposalMethod() const { return mDisposalMethod; }
+  bool FormatHasAlpha() const { return mFormat == SurfaceFormat::OS_RGBA; }
+  void GetImageData(uint8_t** aData, uint32_t* length) const;
+  uint8_t* GetImageData() const;
+
+  const IntRect& GetDirtyRect() const { return mDirtyRect; }
+  void SetDirtyRect(const IntRect& aDirtyRect) { mDirtyRect = aDirtyRect; }
+
+  void FinalizeSurface();
+  already_AddRefed<SourceSurface> GetSourceSurface();
+
+  struct AddSizeOfCbData : public SourceSurface::SizeOfInfo {
+    AddSizeOfCbData()
+        : SourceSurface::SizeOfInfo(), mIndex(0), mFinished(false) {}
+
+    size_t mIndex;
+    bool mFinished;
+  };
+
+  typedef std::function<void(AddSizeOfCbData& aMetadata)> AddSizeOfCb;
+
+  void AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
+                              const AddSizeOfCb& aCallback) const;
+
+ private:  // methods
+  ~imgFrame();
+
+  bool AreAllPixelsWritten() const MOZ_REQUIRES(mMonitor);
+  nsresult ImageUpdatedInternal(const nsIntRect& aUpdateRect);
+  void GetImageDataInternal(uint8_t** aData, uint32_t* length) const;
+  uint32_t GetImageBytesPerRow() const;
+  uint32_t GetImageDataLength() const;
+  void FinalizeSurfaceInternal();
+  already_AddRefed<SourceSurface> GetSourceSurfaceInternal();
+
+  struct SurfaceWithFormat {
+    RefPtr<gfxDrawable> mDrawable;
+    SurfaceFormat mFormat;
+    SurfaceWithFormat() : mFormat(SurfaceFormat::UNKNOWN) {}
+    SurfaceWithFormat(gfxDrawable* aDrawable, SurfaceFormat aFormat)
+        : mDrawable(aDrawable), mFormat(aFormat) {}
+    SurfaceWithFormat(SurfaceWithFormat&& aOther)
+        : mDrawable(std::move(aOther.mDrawable)), mFormat(aOther.mFormat) {}
+    SurfaceWithFormat& operator=(SurfaceWithFormat&& aOther) {
+      mDrawable = std::move(aOther.mDrawable);
+      mFormat = aOther.mFormat;
+      return *this;
+    }
+    SurfaceWithFormat& operator=(const SurfaceWithFormat& aOther) = delete;
+    SurfaceWithFormat(const SurfaceWithFormat& aOther) = delete;
+    bool IsValid() { return !!mDrawable; }
+  };
+
+  SurfaceWithFormat SurfaceForDrawing(bool aDoPartialDecode, bool aDoTile,
+                                      ImageRegion& aRegion,
+                                      SourceSurface* aSurface);
+
+ private:  // data
+  friend class DrawableFrameRef;
+  friend class RawAccessFrameRef;
+  friend class UnlockImageDataRunnable;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Thread-safe mutable data, protected by mMonitor.
+  //////////////////////////////////////////////////////////////////////////////
+
+  mutable Monitor mMonitor;
+
+  /**
+   * Used for rasterized images, this contains the raw pixel data.
+   */
+  RefPtr<SourceSurfaceSharedData> mRawSurface MOZ_GUARDED_BY(mMonitor);
+  RefPtr<SourceSurfaceSharedData> mBlankRawSurface MOZ_GUARDED_BY(mMonitor);
+
+  /**
+   * Used for vector images that were not rasterized directly. This might be a
+   * blob recording or native surface.
+   */
+  RefPtr<SourceSurface> mOptSurface MOZ_GUARDED_BY(mMonitor);
+
+  nsIntRect mDecoded MOZ_GUARDED_BY(mMonitor);
+
+  bool mAborted MOZ_GUARDED_BY(mMonitor);
+  bool mFinished MOZ_GUARDED_BY(mMonitor);
+  bool mShouldRecycle MOZ_GUARDED_BY(mMonitor);
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Effectively const data, only mutated in the Init methods.
+  //////////////////////////////////////////////////////////////////////////////
+
+  //! The size of the buffer we are decoding to.
+  IntSize mImageSize;
+
+  //! The contents for the frame, as represented in the encoded image. This may
+  //! differ from mImageSize because it may be a partial frame. For the first
+  //! frame, this means we need to shift the data in place, and for animated
+  //! frames, it likely need to combine with a previous frame to get the full
+  //! contents.
+  IntRect mBlendRect;
+
+  //! This is the region that has changed between this frame and the previous
+  //! frame of an animation. For the first frame, this will be the same as
+  //! mFrameRect.
+  IntRect mDirtyRect;
+
+  //! The timeout for this frame.
+  FrameTimeout mTimeout;
+
+  DisposalMethod mDisposalMethod;
+  BlendMethod mBlendMethod;
+  SurfaceFormat mFormat;
+
+  bool mNonPremult;
+};
+
+/**
+ * A reference to an imgFrame that holds the imgFrame's surface in memory,
+ * allowing drawing. If you have a DrawableFrameRef |ref| and |if (ref)| returns
+ * true, then calls to Draw() and GetSourceSurface() are guaranteed to succeed.
+ */
+class DrawableFrameRef final {
+  typedef gfx::DataSourceSurface DataSourceSurface;
+
+ public:
+  DrawableFrameRef() {}
+
+  explicit DrawableFrameRef(imgFrame* aFrame) : mFrame(aFrame) {
+    MOZ_ASSERT(aFrame);
+    MonitorAutoLock lock(aFrame->mMonitor);
+
+    if (aFrame->mRawSurface) {
+      mRef.emplace(aFrame->mRawSurface, DataSourceSurface::READ);
+      if (!mRef->IsMapped()) {
+        mFrame = nullptr;
+        mRef.reset();
+      }
+    } else if (!aFrame->mOptSurface || !aFrame->mOptSurface->IsValid()) {
+      // The optimized surface has become invalid, so we need to redecode.
+      // For example, on Windows, there may have been a device reset, and
+      // all D2D surfaces now need to be recreated.
+      mFrame = nullptr;
+    }
+  }
+
+  DrawableFrameRef(DrawableFrameRef&& aOther)
+      : mFrame(std::move(aOther.mFrame)), mRef(std::move(aOther.mRef)) {}
+
+  DrawableFrameRef& operator=(DrawableFrameRef&& aOther) {
+    MOZ_ASSERT(this != &aOther, "Self-moves are prohibited");
+    mFrame = std::move(aOther.mFrame);
+    mRef = std::move(aOther.mRef);
+    return *this;
+  }
+
+  explicit operator bool() const { return bool(mFrame); }
+
+  imgFrame* operator->() {
+    MOZ_ASSERT(mFrame);
+    return mFrame;
+  }
+
+  const imgFrame* operator->() const {
+    MOZ_ASSERT(mFrame);
+    return mFrame;
+  }
+
+  imgFrame* get() { return mFrame; }
+  const imgFrame* get() const { return mFrame; }
+
+  void reset() {
+    mFrame = nullptr;
+    mRef.reset();
+  }
+
+ private:
+  DrawableFrameRef(const DrawableFrameRef& aOther) = delete;
+  DrawableFrameRef& operator=(const DrawableFrameRef& aOther) = delete;
+
+  RefPtr<imgFrame> mFrame;
+  Maybe<DataSourceSurface::ScopedMap> mRef;
+};
+
+/**
+ * A reference to an imgFrame that holds the imgFrame's surface in memory in a
+ * format appropriate for access as raw data. If you have a RawAccessFrameRef
+ * |ref| and |if (ref)| is true, then calls to GetImageData() is guaranteed to
+ * succeed. This guarantee is stronger than DrawableFrameRef, so everything that
+ * a valid DrawableFrameRef guarantees is also guaranteed by a valid
+ * RawAccessFrameRef.
+ *
+ * This may be considerably more expensive than is necessary just for drawing,
+ * so only use this when you need to read or write the raw underlying image data
+ * that the imgFrame holds.
+ *
+ * Once all an imgFrame's RawAccessFrameRefs go out of scope, new
+ * RawAccessFrameRefs cannot be created.
+ */
+class RawAccessFrameRef final {
+ public:
+  RawAccessFrameRef() : mData(nullptr) {}
+
+  explicit RawAccessFrameRef(imgFrame* aFrame)
+      : mFrame(aFrame), mData(nullptr) {
+    MOZ_ASSERT(mFrame, "Need a frame");
+
+    mData = mFrame->GetImageData();
+    if (!mData) {
+      mFrame = nullptr;
+    }
+  }
+
+  RawAccessFrameRef(RawAccessFrameRef&& aOther)
+      : mFrame(std::move(aOther.mFrame)), mData(aOther.mData) {
+    aOther.mData = nullptr;
+  }
+
+  ~RawAccessFrameRef() {}
+
+  RawAccessFrameRef& operator=(RawAccessFrameRef&& aOther) {
+    MOZ_ASSERT(this != &aOther, "Self-moves are prohibited");
+
+    mFrame = std::move(aOther.mFrame);
+    mData = aOther.mData;
+    aOther.mData = nullptr;
+
+    return *this;
+  }
+
+  explicit operator bool() const { return bool(mFrame); }
+
+  imgFrame* operator->() {
+    MOZ_ASSERT(mFrame);
+    return mFrame.get();
+  }
+
+  const imgFrame* operator->() const {
+    MOZ_ASSERT(mFrame);
+    return mFrame;
+  }
+
+  imgFrame* get() { return mFrame; }
+  const imgFrame* get() const { return mFrame; }
+
+  void reset() {
+    mFrame = nullptr;
+    mData = nullptr;
+  }
+
+  uint8_t* Data() const { return mData; }
+
+ private:
+  RawAccessFrameRef(const RawAccessFrameRef& aOther) = delete;
+  RawAccessFrameRef& operator=(const RawAccessFrameRef& aOther) = delete;
+
+  RefPtr<imgFrame> mFrame;
+  uint8_t* mData;
+};
+
+}  // namespace image
+}  // namespace mozilla
+
+#endif  // mozilla_image_imgFrame_h