Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 484 insertions, 0 deletions

diff --git a/image/RasterImage.h b/image/RasterImage.h
new file mode 100644
index 0000000000..28cc56e54e
--- /dev/null
+++ b/image/RasterImage.h
@@ -0,0 +1,484 @@
+/* -*- 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/. */
+
+/** @file
+ * This file declares the RasterImage class, which
+ * handles static and animated rasterized images.
+ *
+ * @author  Stuart Parmenter <pavlov@netscape.com>
+ * @author  Chris Saari <saari@netscape.com>
+ * @author  Arron Mogge <paper@animecity.nu>
+ * @author  Andrew Smith <asmith15@learn.senecac.on.ca>
+ */
+
+#ifndef mozilla_image_RasterImage_h
+#define mozilla_image_RasterImage_h
+
+#include "Image.h"
+#include "nsCOMPtr.h"
+#include "imgIContainer.h"
+#include "nsTArray.h"
+#include "LookupResult.h"
+#include "nsThreadUtils.h"
+#include "DecoderFactory.h"
+#include "FrameAnimator.h"
+#include "ImageMetadata.h"
+#include "ISurfaceProvider.h"
+#include "Orientation.h"
+#include "mozilla/AtomicBitfields.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/NotNull.h"
+#include "mozilla/StaticPrefs_image.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/WeakPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/image/Resolution.h"
+#include "ImageContainer.h"
+#include "PlaybackType.h"
+#ifdef DEBUG
+#  include "imgIContainerDebug.h"
+#endif
+
+class nsIInputStream;
+class nsIRequest;
+
+#define NS_RASTERIMAGE_CID                           \
+  { /* 376ff2c1-9bf6-418a-b143-3340c00112f7 */       \
+    0x376ff2c1, 0x9bf6, 0x418a, {                    \
+      0xb1, 0x43, 0x33, 0x40, 0xc0, 0x01, 0x12, 0xf7 \
+    }                                                \
+  }
+
+/**
+ * Handles static and animated image containers.
+ *
+ *
+ * @par A Quick Walk Through
+ * The decoder initializes this class and calls AppendFrame() to add a frame.
+ * Once RasterImage detects more than one frame, it starts the animation
+ * with StartAnimation(). Note that the invalidation events for RasterImage are
+ * generated automatically using nsRefreshDriver.
+ *
+ * @par
+ * StartAnimation() initializes the animation helper object and sets the time
+ * the first frame was displayed to the current clock time.
+ *
+ * @par
+ * When the refresh driver corresponding to the imgIContainer that this image is
+ * a part of notifies the RasterImage that it's time to invalidate,
+ * RequestRefresh() is called with a given TimeStamp to advance to. As long as
+ * the timeout of the given frame (the frame's "delay") plus the time that frame
+ * was first displayed is less than or equal to the TimeStamp given,
+ * RequestRefresh() calls AdvanceFrame().
+ *
+ * @par
+ * AdvanceFrame() is responsible for advancing a single frame of the animation.
+ * It can return true, meaning that the frame advanced, or false, meaning that
+ * the frame failed to advance (usually because the next frame hasn't been
+ * decoded yet). It is also responsible for performing the final animation stop
+ * procedure if the final frame of a non-looping animation is reached.
+ *
+ * @par
+ * Each frame can have a different method of removing itself. These are
+ * listed as imgIContainer::cDispose... constants.  Notify() calls
+ * DoComposite() to handle any special frame destruction.
+ *
+ * @par
+ * The basic path through DoComposite() is:
+ * 1) Calculate Area that needs updating, which is at least the area of
+ *    aNextFrame.
+ * 2) Dispose of previous frame.
+ * 3) Draw new image onto compositingFrame.
+ * See comments in DoComposite() for more information and optimizations.
+ *
+ * @par
+ * The rest of the RasterImage specific functions are used by DoComposite to
+ * destroy the old frame and build the new one.
+ *
+ * @note
+ * <li> "Mask", "Alpha", and "Alpha Level" are interchangeable phrases in
+ * respects to RasterImage.
+ *
+ * @par
+ * <li> GIFs never have more than a 1 bit alpha.
+ * <li> APNGs may have a full alpha channel.
+ *
+ * @par
+ * <li> Background color specified in GIF is ignored by web browsers.
+ *
+ * @par
+ * <li> If Frame 3 wants to dispose by restoring previous, what it wants is to
+ * restore the composition up to and including Frame 2, as well as Frame 2s
+ * disposal.  So, in the middle of DoComposite when composing Frame 3, right
+ * after destroying Frame 2's area, we copy compositingFrame to
+ * prevCompositingFrame.  When DoComposite gets called to do Frame 4, we
+ * copy prevCompositingFrame back, and then draw Frame 4 on top.
+ *
+ * @par
+ * The mAnim structure has members only needed for animated images, so
+ * it's not allocated until the second frame is added.
+ */
+
+namespace mozilla {
+namespace layers {
+class ImageContainer;
+class Image;
+class LayersManager;
+}  // namespace layers
+
+namespace image {
+
+class Decoder;
+struct DecoderFinalStatus;
+struct DecoderTelemetry;
+class ImageMetadata;
+class SourceBuffer;
+
+class RasterImage final : public ImageResource,
+                          public SupportsWeakPtr
+#ifdef DEBUG
+    ,
+                          public imgIContainerDebug
+#endif
+{
+  // (no public constructor - use ImageFactory)
+  virtual ~RasterImage();
+
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_IMGICONTAINER
+#ifdef DEBUG
+  NS_DECL_IMGICONTAINERDEBUG
+#endif
+
+  virtual nsresult StartAnimation() override;
+  virtual nsresult StopAnimation() override;
+
+  // Methods inherited from Image
+  virtual void OnSurfaceDiscarded(const SurfaceKey& aSurfaceKey) override;
+
+  virtual size_t SizeOfSourceWithComputedFallback(
+      SizeOfState& aState) const override;
+
+  /* Triggers discarding. */
+  void Discard();
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Decoder callbacks.
+  //////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Sends the provided progress notifications to ProgressTracker.
+   *
+   * Main-thread only.
+   *
+   * @param aProgress    The progress notifications to send.
+   * @param aInvalidRect An invalidation rect to send.
+   * @param aFrameCount  If Some(), an updated count of the number of frames of
+   *                     animation the decoder has finished decoding so far.
+   *                     This is a lower bound for the total number of
+   *                     animation frames this image has.
+   * @param aDecoderFlags The decoder flags used by the decoder that generated
+   *                      these notifications, or DefaultDecoderFlags() if the
+   *                      notifications don't come from a decoder.
+   * @param aSurfaceFlags The surface flags used by the decoder that generated
+   *                      these notifications, or DefaultSurfaceFlags() if the
+   *                      notifications don't come from a decoder.
+   */
+  void NotifyProgress(Progress aProgress,
+                      const OrientedIntRect& aInvalidRect = OrientedIntRect(),
+                      const Maybe<uint32_t>& aFrameCount = Nothing(),
+                      DecoderFlags aDecoderFlags = DefaultDecoderFlags(),
+                      SurfaceFlags aSurfaceFlags = DefaultSurfaceFlags());
+
+  /**
+   * Records decoding results, sends out any final notifications, updates the
+   * state of this image, and records telemetry.
+   *
+   * Main-thread only.
+   *
+   * @param aStatus       Final status information about the decoder. (Whether
+   * it encountered an error, etc.)
+   * @param aMetadata     Metadata about this image that the decoder gathered.
+   * @param aTelemetry    Telemetry data about the decoder.
+   * @param aProgress     Any final progress notifications to send.
+   * @param aInvalidRect  Any final invalidation rect to send.
+   * @param aFrameCount   If Some(), a final updated count of the number of
+   * frames of animation the decoder has finished decoding so far. This is a
+   * lower bound for the total number of animation frames this image has.
+   * @param aDecoderFlags The decoder flags used by the decoder.
+   * @param aSurfaceFlags The surface flags used by the decoder.
+   */
+  void NotifyDecodeComplete(
+      const DecoderFinalStatus& aStatus, const ImageMetadata& aMetadata,
+      const DecoderTelemetry& aTelemetry, Progress aProgress,
+      const OrientedIntRect& aInvalidRect, const Maybe<uint32_t>& aFrameCount,
+      DecoderFlags aDecoderFlags, SurfaceFlags aSurfaceFlags);
+
+  // Helper method for NotifyDecodeComplete.
+  void ReportDecoderError();
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Network callbacks.
+  //////////////////////////////////////////////////////////////////////////////
+
+  virtual nsresult OnImageDataAvailable(nsIRequest* aRequest,
+                                        nsIInputStream* aInStr,
+                                        uint64_t aSourceOffset,
+                                        uint32_t aCount) override;
+  virtual nsresult OnImageDataComplete(nsIRequest* aRequest, nsresult aStatus,
+                                       bool aLastPart) override;
+
+  void NotifyForLoadEvent(Progress aProgress);
+
+  /**
+   * A hint of the number of bytes of source data that the image contains. If
+   * called early on, this can help reduce copying and reallocations by
+   * appropriately preallocating the source data buffer.
+   *
+   * We take this approach rather than having the source data management code do
+   * something more complicated (like chunklisting) because HTTP is by far the
+   * dominant source of images, and the Content-Length header is quite reliable.
+   * Thus, pre-allocation simplifies code and reduces the total number of
+   * allocations.
+   */
+  nsresult SetSourceSizeHint(uint32_t aSizeHint);
+
+  nsCString GetURIString() {
+    nsCString spec;
+    if (GetURI()) {
+      GetURI()->GetSpec(spec);
+    }
+    return spec;
+  }
+
+ private:
+  nsresult Init(const char* aMimeType, uint32_t aFlags);
+
+  /**
+   * Tries to retrieve a surface for this image with size @aSize, surface flags
+   * matching @aFlags, and a playback type of @aPlaybackType.
+   *
+   * If @aFlags specifies FLAG_SYNC_DECODE and we already have all the image
+   * data, we'll attempt a sync decode if no matching surface is found. If
+   * FLAG_SYNC_DECODE was not specified and no matching surface was found, we'll
+   * kick off an async decode so that the surface is (hopefully) available next
+   * time it's requested. aMarkUsed determines if we mark the surface used in
+   * the surface cache or not.
+   *
+   * @return a drawable surface, which may be empty if the requested surface
+   *         could not be found.
+   */
+  LookupResult LookupFrame(const OrientedIntSize& aSize, uint32_t aFlags,
+                           PlaybackType aPlaybackType, bool aMarkUsed);
+
+  /// Helper method for LookupFrame().
+  LookupResult LookupFrameInternal(const OrientedIntSize& aSize,
+                                   uint32_t aFlags, PlaybackType aPlaybackType,
+                                   bool aMarkUsed);
+
+  ImgDrawResult DrawInternal(DrawableSurface&& aFrameRef, gfxContext* aContext,
+                             const OrientedIntSize& aSize,
+                             const ImageRegion& aRegion,
+                             gfx::SamplingFilter aSamplingFilter,
+                             uint32_t aFlags, float aOpacity);
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Decoding.
+  //////////////////////////////////////////////////////////////////////////////
+
+  /**
+   * Creates and runs a decoder, either synchronously or asynchronously
+   * according to @aFlags. Decodes at the provided target size @aSize, using
+   * decode flags @aFlags. Performs a single-frame decode of this image unless
+   * we know the image is animated *and* @aPlaybackType is
+   * PlaybackType::eAnimated.
+   *
+   * It's an error to call Decode() before this image's intrinsic size is
+   * available. A metadata decode must successfully complete first.
+   *
+   * aOutRanSync is set to true if the decode was run synchronously.
+   * aOutFailed is set to true if failed to start a decode.
+   */
+  void Decode(const OrientedIntSize& aSize, uint32_t aFlags,
+              PlaybackType aPlaybackType, bool& aOutRanSync, bool& aOutFailed);
+
+  /**
+   * Creates and runs a metadata decoder, either synchronously or
+   * asynchronously according to @aFlags.
+   */
+  NS_IMETHOD DecodeMetadata(uint32_t aFlags);
+
+  /**
+   * Sets the size, inherent orientation, animation metadata, and other
+   * information about the image gathered during decoding.
+   *
+   * This function may be called multiple times, but will throw an error if
+   * subsequent calls do not match the first.
+   *
+   * @param aMetadata The metadata to set on this image.
+   * @param aFromMetadataDecode True if this metadata came from a metadata
+   *                            decode; false if it came from a full decode.
+   * @return |true| unless a catastrophic failure was discovered. If |false| is
+   * returned, it indicates that the image is corrupt in a way that requires all
+   * surfaces to be discarded to recover.
+   */
+  bool SetMetadata(const ImageMetadata& aMetadata, bool aFromMetadataDecode);
+
+  /**
+   * In catastrophic circumstances like a GPU driver crash, the contents of our
+   * frames may become invalid.  If the information we gathered during the
+   * metadata decode proves to be wrong due to image corruption, the frames we
+   * have may violate this class's invariants. Either way, we need to
+   * immediately discard the invalid frames and redecode so that callers don't
+   * perceive that we've entered an invalid state.
+   *
+   * RecoverFromInvalidFrames discards all existing frames and redecodes using
+   * the provided @aSize and @aFlags.
+   */
+  void RecoverFromInvalidFrames(const OrientedIntSize& aSize, uint32_t aFlags);
+
+  void OnSurfaceDiscardedInternal(bool aAnimatedFramesDiscarded);
+
+ private:  // data
+  OrientedIntSize mSize;
+  nsTArray<OrientedIntSize> mNativeSizes;
+
+  // The orientation required to correctly orient the image, from the image's
+  // metadata. RasterImage will handle and apply this orientation itself.
+  Orientation mOrientation;
+
+  // The resolution as specified in the image metadata, in dppx.
+  Resolution mResolution;
+
+  /// If this has a value, we're waiting for SetSize() to send the load event.
+  Maybe<Progress> mLoadProgress;
+
+  // Hotspot of this image, or (0, 0) if there is no hotspot data.
+  //
+  // We assume (and assert) that no image has both orientation metadata and a
+  // hotspot, so we store this as an untyped point.
+  gfx::IntPoint mHotspot;
+
+  /// If this image is animated, a FrameAnimator which manages its animation.
+  UniquePtr<FrameAnimator> mFrameAnimator;
+
+  /// Animation timeline and other state for animation images.
+  Maybe<AnimationState> mAnimationState;
+
+  // Image locking.
+  uint32_t mLockCount;
+
+  // The type of decoder this image needs. Computed from the MIME type in
+  // Init().
+  DecoderType mDecoderType;
+
+  // How many times we've decoded this image.
+  // This is currently only used for statistics
+  int32_t mDecodeCount;
+
+#ifdef DEBUG
+  uint32_t mFramesNotified;
+#endif
+
+  // The source data for this image.
+  NotNull<RefPtr<SourceBuffer>> mSourceBuffer;
+
+  // Boolean flags (clustered together to conserve space):
+  MOZ_ATOMIC_BITFIELDS(
+      mAtomicBitfields, 16,
+      ((bool, HasSize, 1),         // Has SetSize() been called?
+       (bool, Transient, 1),       // Is the image short-lived?
+       (bool, SyncLoad, 1),        // Are we loading synchronously?
+       (bool, Discardable, 1),     // Is container discardable?
+       (bool, SomeSourceData, 1),  // Do we have some source data?
+       (bool, AllSourceData, 1),   // Do we have all the source data?
+       (bool, HasBeenDecoded, 1),  // Decoded at least once?
+
+       // Whether we're waiting to start animation. If we get a StartAnimation()
+       // call but we don't yet have more than one frame, mPendingAnimation is
+       // set so that we know to start animation later if/when we have more
+       // frames.
+       (bool, PendingAnimation, 1),
+
+       // Whether the animation can stop, due to running out
+       // of frames, or no more owning request
+       (bool, AnimationFinished, 1),
+
+       // Whether, once we are done doing a metadata decode, we should
+       // immediately kick off a full decode.
+       (bool, WantFullDecode, 1)))
+
+  TimeStamp mDrawStartTime;
+
+  // This field is set according to the DecoderType of this image once when
+  // initialized so that a decoder's flags can be set according to any
+  // preferences that affect its behavior in a way that would otherwise cause
+  // errors, such as enabling or disabling animation.
+  DecoderFlags mDefaultDecoderFlags = DefaultDecoderFlags();
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Scaling.
+  //////////////////////////////////////////////////////////////////////////////
+
+  // Determines whether we can downscale during decode with the given
+  // parameters.
+  bool CanDownscaleDuringDecode(const OrientedIntSize& aSize, uint32_t aFlags);
+
+  // Error handling.
+  void DoError();
+
+  class HandleErrorWorker : public Runnable {
+   public:
+    /**
+     * Called from decoder threads when DoError() is called, since errors can't
+     * be handled safely off-main-thread. Dispatches an event which reinvokes
+     * DoError on the main thread if there isn't one already pending.
+     */
+    static void DispatchIfNeeded(RasterImage* aImage);
+
+    NS_IMETHOD Run() override;
+
+   private:
+    explicit HandleErrorWorker(RasterImage* aImage);
+
+    RefPtr<RasterImage> mImage;
+  };
+
+  // Helpers
+  bool CanDiscard();
+
+  bool IsOpaque();
+
+  LookupResult RequestDecodeForSizeInternal(const OrientedIntSize& aSize,
+                                            uint32_t aFlags,
+                                            uint32_t aWhichFrame);
+
+ protected:
+  explicit RasterImage(nsIURI* aURI = nullptr);
+
+  bool ShouldAnimate() override;
+
+  friend class ImageFactory;
+};
+
+inline NS_IMETHODIMP RasterImage::GetAnimationMode(uint16_t* aAnimationMode) {
+  return GetAnimationModeInternal(aAnimationMode);
+}
+
+}  // namespace image
+}  // namespace mozilla
+
+/**
+ * Casting RasterImage to nsISupports is ambiguous. This method handles that.
+ */
+inline nsISupports* ToSupports(mozilla::image::RasterImage* p) {
+  return NS_ISUPPORTS_CAST(mozilla::image::ImageResource*, p);
+}
+
+#endif /* mozilla_image_RasterImage_h */