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, 481 insertions, 0 deletions

diff --git a/gfx/layers/NativeLayerCA.h b/gfx/layers/NativeLayerCA.h
new file mode 100644
index 0000000000..ce4ce6fd93
--- /dev/null
+++ b/gfx/layers/NativeLayerCA.h
@@ -0,0 +1,481 @@
+/* -*- 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_layers_NativeLayerCA_h
+#define mozilla_layers_NativeLayerCA_h
+
+#include <IOSurface/IOSurface.h>
+
+#include <deque>
+#include <unordered_map>
+#include <ostream>
+
+#include "mozilla/Mutex.h"
+#include "mozilla/TimeStamp.h"
+
+#include "mozilla/gfx/MacIOSurface.h"
+#include "mozilla/layers/NativeLayer.h"
+#include "CFTypeRefPtr.h"
+#include "nsRegion.h"
+#include "nsISupportsImpl.h"
+
+#ifdef __OBJC__
+@class CALayer;
+#else
+typedef void CALayer;
+#endif
+
+namespace mozilla {
+
+namespace gl {
+class GLContextCGL;
+class MozFramebuffer;
+}  // namespace gl
+namespace wr {
+class RenderMacIOSurfaceTextureHost;
+}  // namespace wr
+
+namespace layers {
+
+class NativeLayerRootSnapshotterCA;
+class SurfacePoolHandleCA;
+
+enum class VideoLowPowerType {
+  // These must be kept synchronized with the telemetry histogram enums.
+  NotVideo,           // Never emitted as telemetry. No video is visible.
+  LowPower,           // As best we can tell, we are in the "detached",
+                      // low-power compositing mode. We don't use "Success"
+                      // because of name collision with telemetry generation.
+  FailMultipleVideo,  // There is more than one video visible.
+  FailWindowed,       // The window is not fullscreen.
+  FailOverlaid,       // Something is on top of the video (likely captions).
+  FailBacking,        // The layer behind the video is not full-coverage black.
+  FailMacOSVersion,   // macOS version does not meet requirements.
+  FailPref,           // Pref is not set.
+  FailSurface,        // Surface is not eligible.
+  FailEnqueue,        // Enqueueing the video didn't work.
+};
+
+// NativeLayerRootCA is the CoreAnimation implementation of the NativeLayerRoot
+// interface. A NativeLayerRootCA is created by the widget around an existing
+// CALayer with a call to CreateForCALayer - this CALayer is the root of the
+// "onscreen" representation of this layer tree.
+// All methods can be called from any thread, there is internal locking.
+// All effects from mutating methods are buffered locally and don't modify the
+// underlying CoreAnimation layers until CommitToScreen() is called. This
+// ensures that the modifications happen on the right thread.
+//
+// More specifically: During normal operation, screen updates are driven from a
+// compositing thread. On this thread, the layers are created / destroyed, their
+// contents are painted, and the result is committed to the screen. However,
+// there are some scenarios that need to involve the main thread, most notably
+// window resizing: During a window resize, we still need the drawing part to
+// happen on the compositing thread, but the modifications to the underlying
+// CALayers need to happen on the main thread, once compositing is done.
+//
+// NativeLayerRootCA + NativeLayerCA create and maintain *two* CALayer tree
+// representations: An "onscreen" representation and an "offscreen"
+// representation. These representations are updated via calls to
+// CommitToScreen() and CommitOffscreen(), respectively. The reason for having
+// two representations is the following: Our implementation of the snapshotter
+// API uses CARenderer, which lets us render the composited result of our layer
+// tree into a GPU buffer. But CARenderer requires "ownership" of the rendered
+// CALayers in the sense that it associates the CALayers with a local
+// "CAContext". A CALayer can only be associated with one CAContext at any time.
+// If we wanted te render our *onscreen* CALayers with CARenderer, we would need
+// to remove them from the window, reparent them to the CARenderer, render them,
+// and then put them back into the window. This would lead to a visible flashing
+// effect. To solve this problem, we build two CALayer representations, so that
+// one representation can stay inside the window and the other can stay attached
+// to the CARenderer.
+class NativeLayerRootCA : public NativeLayerRoot {
+ public:
+  static already_AddRefed<NativeLayerRootCA> CreateForCALayer(CALayer* aLayer);
+
+  virtual NativeLayerRootCA* AsNativeLayerRootCA() override { return this; }
+
+  // Can be called on any thread at any point. Returns whether comitting was
+  // successful. Will return false if called off the main thread while
+  // off-main-thread commits are suspended.
+  bool CommitToScreen() override;
+
+  void CommitOffscreen();
+  void OnNativeLayerRootSnapshotterDestroyed(
+      NativeLayerRootSnapshotterCA* aNativeLayerRootSnapshotter);
+
+  // Enters a mode during which CommitToScreen(), when called on a non-main
+  // thread, will not apply any updates to the CALayer tree.
+  void SuspendOffMainThreadCommits();
+
+  // Exits the mode entered by SuspendOffMainThreadCommits().
+  // Returns true if the last CommitToScreen() was canceled due to suspension,
+  // indicating that another call to CommitToScreen() is needed.
+  bool UnsuspendOffMainThreadCommits();
+
+  bool AreOffMainThreadCommitsSuspended();
+
+  void DumpLayerTreeToFile(const char* aPath);
+
+  enum class WhichRepresentation : uint8_t { ONSCREEN, OFFSCREEN };
+
+  // Overridden methods
+  already_AddRefed<NativeLayer> CreateLayer(const gfx::IntSize& aSize, bool aIsOpaque,
+                                            SurfacePoolHandle* aSurfacePoolHandle) override;
+  void AppendLayer(NativeLayer* aLayer) override;
+  void RemoveLayer(NativeLayer* aLayer) override;
+  void SetLayers(const nsTArray<RefPtr<NativeLayer>>& aLayers) override;
+  UniquePtr<NativeLayerRootSnapshotter> CreateSnapshotter() override;
+
+  void SetBackingScale(float aBackingScale);
+  float BackingScale();
+
+  already_AddRefed<NativeLayer> CreateLayerForExternalTexture(bool aIsOpaque) override;
+  already_AddRefed<NativeLayer> CreateLayerForColor(gfx::DeviceColor aColor) override;
+
+  void SetWindowIsFullscreen(bool aFullscreen);
+
+  VideoLowPowerType CheckVideoLowPower();
+
+ protected:
+  explicit NativeLayerRootCA(CALayer* aLayer);
+  ~NativeLayerRootCA() override;
+
+  struct Representation {
+    explicit Representation(CALayer* aRootCALayer);
+    ~Representation();
+    void Commit(WhichRepresentation aRepresentation,
+                const nsTArray<RefPtr<NativeLayerCA>>& aSublayers, bool aWindowIsFullscreen);
+    CALayer* mRootCALayer = nullptr;  // strong
+    bool mMutatedLayerStructure = false;
+  };
+
+  template <typename F>
+  void ForAllRepresentations(F aFn);
+
+  Mutex mMutex MOZ_UNANNOTATED;  // protects all other fields
+  Representation mOnscreenRepresentation;
+  Representation mOffscreenRepresentation;
+  NativeLayerRootSnapshotterCA* mWeakSnapshotter = nullptr;
+  nsTArray<RefPtr<NativeLayerCA>> mSublayers;  // in z-order
+  float mBackingScale = 1.0f;
+  bool mMutated = false;
+
+  // While mOffMainThreadCommitsSuspended is true, no commits
+  // should happen on a non-main thread, because they might race with
+  // main-thread driven updates such as window shape changes, and cause
+  // glitches.
+  bool mOffMainThreadCommitsSuspended = false;
+
+  // Set to true if CommitToScreen() was aborted because of commit suspension.
+  // Set to false when CommitToScreen() completes successfully. When true,
+  // indicates that CommitToScreen() needs to be called at the next available
+  // opportunity.
+  bool mCommitPending = false;
+
+  // Updated by the layer's view's window to match the fullscreen state
+  // of that window.
+  bool mWindowIsFullscreen = false;
+
+  // How many times have we committed since the last time we emitted
+  // telemetry?
+  unsigned int mTelemetryCommitCount = 0;
+};
+
+class RenderSourceNLRS;
+
+class NativeLayerRootSnapshotterCA final : public NativeLayerRootSnapshotter {
+ public:
+  static UniquePtr<NativeLayerRootSnapshotterCA> Create(NativeLayerRootCA* aLayerRoot,
+                                                        CALayer* aRootCALayer);
+  virtual ~NativeLayerRootSnapshotterCA();
+
+  bool ReadbackPixels(const gfx::IntSize& aReadbackSize, gfx::SurfaceFormat aReadbackFormat,
+                      const Range<uint8_t>& aReadbackBuffer) override;
+  already_AddRefed<profiler_screenshots::RenderSource> GetWindowContents(
+      const gfx::IntSize& aWindowSize) override;
+  already_AddRefed<profiler_screenshots::DownscaleTarget> CreateDownscaleTarget(
+      const gfx::IntSize& aSize) override;
+  already_AddRefed<profiler_screenshots::AsyncReadbackBuffer> CreateAsyncReadbackBuffer(
+      const gfx::IntSize& aSize) override;
+
+ protected:
+  NativeLayerRootSnapshotterCA(NativeLayerRootCA* aLayerRoot, RefPtr<gl::GLContext>&& aGL,
+                               CALayer* aRootCALayer);
+  void UpdateSnapshot(const gfx::IntSize& aSize);
+
+  RefPtr<NativeLayerRootCA> mLayerRoot;
+  RefPtr<gl::GLContext> mGL;
+
+  // Can be null. Created and updated in UpdateSnapshot.
+  RefPtr<RenderSourceNLRS> mSnapshot;
+  CARenderer* mRenderer = nullptr;  // strong
+};
+
+// NativeLayerCA wraps a CALayer and lets you draw to it. It ensures that only
+// fully-drawn frames make their way to the screen, by maintaining a swap chain
+// of IOSurfaces.
+// All calls to mutating methods are buffered, and don't take effect on the
+// underlying CoreAnimation layers until ApplyChanges() is called.
+// The two most important methods are NextSurface and NotifySurfaceReady:
+// NextSurface takes an available surface from the swap chain or creates a new
+// surface if necessary. This surface can then be drawn to. Once drawing is
+// finished, NotifySurfaceReady marks the surface as ready. This surface is
+// committed to the layer during the next call to ApplyChanges().
+// The swap chain keeps track of invalid areas within the surfaces.
+class NativeLayerCA : public NativeLayer {
+ public:
+  virtual NativeLayerCA* AsNativeLayerCA() override { return this; }
+
+  // Overridden methods
+  gfx::IntSize GetSize() override;
+  void SetPosition(const gfx::IntPoint& aPosition) override;
+  gfx::IntPoint GetPosition() override;
+  void SetTransform(const gfx::Matrix4x4& aTransform) override;
+  gfx::Matrix4x4 GetTransform() override;
+  gfx::IntRect GetRect() override;
+  void SetSamplingFilter(gfx::SamplingFilter aSamplingFilter) override;
+  RefPtr<gfx::DrawTarget> NextSurfaceAsDrawTarget(const gfx::IntRect& aDisplayRect,
+                                                  const gfx::IntRegion& aUpdateRegion,
+                                                  gfx::BackendType aBackendType) override;
+  Maybe<GLuint> NextSurfaceAsFramebuffer(const gfx::IntRect& aDisplayRect,
+                                         const gfx::IntRegion& aUpdateRegion,
+                                         bool aNeedsDepth) override;
+  void NotifySurfaceReady() override;
+  void DiscardBackbuffers() override;
+  bool IsOpaque() override;
+  void SetClipRect(const Maybe<gfx::IntRect>& aClipRect) override;
+  Maybe<gfx::IntRect> ClipRect() override;
+  gfx::IntRect CurrentSurfaceDisplayRect() override;
+  void SetSurfaceIsFlipped(bool aIsFlipped) override;
+  bool SurfaceIsFlipped() override;
+
+  void DumpLayer(std::ostream& aOutputStream);
+
+  void AttachExternalImage(wr::RenderTextureHost* aExternalImage) override;
+
+  void SetRootWindowIsFullscreen(bool aFullscreen);
+
+ protected:
+  friend class NativeLayerRootCA;
+
+  NativeLayerCA(const gfx::IntSize& aSize, bool aIsOpaque, SurfacePoolHandleCA* aSurfacePoolHandle);
+  explicit NativeLayerCA(bool aIsOpaque);
+  explicit NativeLayerCA(gfx::DeviceColor aColor);
+  ~NativeLayerCA() override;
+
+  // Gets the next surface for drawing from our swap chain and stores it in
+  // mInProgressSurface. Returns whether this was successful.
+  // mInProgressSurface is guaranteed to be not in use by the window server.
+  // After a call to NextSurface, NextSurface must not be called again until
+  // after NotifySurfaceReady has been called. Can be called on any thread. When
+  // used from multiple threads, callers need to make sure that they still only
+  // call NextSurface and NotifySurfaceReady alternatingly and not in any other
+  // order.
+  bool NextSurface(const MutexAutoLock& aProofOfLock);
+
+  // To be called by NativeLayerRootCA:
+  typedef NativeLayerRootCA::WhichRepresentation WhichRepresentation;
+  CALayer* UnderlyingCALayer(WhichRepresentation aRepresentation);
+
+  enum class UpdateType {
+    None,       // Order is important. Each enum must fully encompass the
+    OnlyVideo,  // work implied by the previous enums.
+    All,
+  };
+
+  UpdateType HasUpdate(WhichRepresentation aRepresentation);
+  bool WillUpdateAffectLayers(WhichRepresentation aRepresentation);
+  bool ApplyChanges(WhichRepresentation aRepresentation, UpdateType aUpdate);
+
+  void SetBackingScale(float aBackingScale);
+
+  // Invalidates the specified region in all surfaces that are tracked by this
+  // layer.
+  void InvalidateRegionThroughoutSwapchain(const MutexAutoLock& aProofOfLock,
+                                           const gfx::IntRegion& aRegion);
+
+  // Invalidate aUpdateRegion and make sure that mInProgressSurface retains any
+  // valid content from the previous surface outside of aUpdateRegion, so that
+  // only aUpdateRegion needs to be drawn. If content needs to be copied,
+  // aCopyFn is called to do the copying.
+  // aCopyFn: Fn(CFTypeRefPtr<IOSurfaceRef> aValidSourceIOSurface,
+  //             const gfx::IntRegion& aCopyRegion) -> void
+  template <typename F>
+  void HandlePartialUpdate(const MutexAutoLock& aProofOfLock, const gfx::IntRect& aDisplayRect,
+                           const gfx::IntRegion& aUpdateRegion, F&& aCopyFn);
+
+  struct SurfaceWithInvalidRegion {
+    CFTypeRefPtr<IOSurfaceRef> mSurface;
+    gfx::IntRegion mInvalidRegion;
+  };
+
+  struct SurfaceWithInvalidRegionAndCheckCount {
+    SurfaceWithInvalidRegion mEntry;
+    uint32_t mCheckCount;  // The number of calls to IOSurfaceIsInUse
+  };
+
+  Maybe<SurfaceWithInvalidRegion> GetUnusedSurfaceAndCleanUp(const MutexAutoLock& aProofOfLock);
+
+  bool IsVideo();
+  bool IsVideoAndLocked(const MutexAutoLock& aProofOfLock);
+  bool ShouldSpecializeVideo(const MutexAutoLock& aProofOfLock);
+  bool HasExtent() const { return mHasExtent; }
+  void SetHasExtent(bool aHasExtent) { mHasExtent = aHasExtent; }
+
+  // This function returns a CGRect if a clip should be applied to the layer.
+  // If set, the CGRect has the scaled position of the clip relative to the
+  // surface origin and the scaled size of the clip rect.
+  static Maybe<CGRect> CalculateClipGeometry(
+      const gfx::IntSize& aSize, const gfx::IntPoint& aPosition, const gfx::Matrix4x4& aTransform,
+      const gfx::IntRect& aDisplayRect, const Maybe<gfx::IntRect>& aClipRect, float aBackingScale);
+
+  // Wraps one CALayer representation of this NativeLayer.
+  struct Representation {
+    Representation();
+    ~Representation();
+
+    CALayer* UnderlyingCALayer() { return mWrappingCALayer; }
+
+    bool EnqueueSurface(IOSurfaceRef aSurfaceRef);
+
+    // Applies buffered changes to the native CALayers. The contract with the
+    // caller is as follows: If any of these values have changed since the last
+    // call to ApplyChanges, mMutated[Field] needs to have been set to true
+    // before the call. If aUpdate is not All, then a partial update will be
+    // applied. In such a case, ApplyChanges may not make any changes that
+    // require a CATransacation, because no transaction will be created. In a
+    // a partial update, the return value will indicate if all the needed
+    // changes were able to be applied under these restrictions. A false return
+    // value indicates an All update is necessary.
+    bool ApplyChanges(UpdateType aUpdate, const gfx::IntSize& aSize, bool aIsOpaque,
+                      const gfx::IntPoint& aPosition, const gfx::Matrix4x4& aTransform,
+                      const gfx::IntRect& aDisplayRect, const Maybe<gfx::IntRect>& aClipRect,
+                      float aBackingScale, bool aSurfaceIsFlipped,
+                      gfx::SamplingFilter aSamplingFilter, bool aSpecializeVideo,
+                      CFTypeRefPtr<IOSurfaceRef> aFrontSurface, CFTypeRefPtr<CGColorRef> aColor,
+                      bool aIsDRM, bool aIsVideo);
+
+    // Return whether any aspects of this layer representation have been mutated
+    // since the last call to ApplyChanges, i.e. whether ApplyChanges needs to
+    // be called.
+    // This is used to optimize away a CATransaction commit if no layers have
+    // changed.
+    UpdateType HasUpdate(bool aIsVideo);
+
+    // Lazily initialized by first call to ApplyChanges. mWrappingLayer is the
+    // layer that applies the intersection of mDisplayRect and mClipRect (if
+    // set), and mContentCALayer is the layer that hosts the IOSurface. We do
+    // not share clip layers between consecutive NativeLayerCA objects with the
+    // same clip rect.
+    CALayer* mWrappingCALayer = nullptr;      // strong
+    CALayer* mContentCALayer = nullptr;       // strong
+    CALayer* mOpaquenessTintLayer = nullptr;  // strong
+
+#ifdef NIGHTLY_BUILD
+    bool mLogNextVideoSurface = false;
+#endif
+
+    bool mMutatedPosition : 1;
+    bool mMutatedTransform : 1;
+    bool mMutatedDisplayRect : 1;
+    bool mMutatedClipRect : 1;
+    bool mMutatedBackingScale : 1;
+    bool mMutatedSize : 1;
+    bool mMutatedSurfaceIsFlipped : 1;
+    bool mMutatedFrontSurface : 1;
+    bool mMutatedSamplingFilter : 1;
+    bool mMutatedSpecializeVideo : 1;
+    bool mMutatedIsDRM : 1;
+  };
+
+  Representation& GetRepresentation(WhichRepresentation aRepresentation);
+  template <typename F>
+  void ForAllRepresentations(F aFn);
+
+  // Controls access to all fields of this class.
+  Mutex mMutex MOZ_UNANNOTATED;
+
+  // Each IOSurface is initially created inside NextSurface.
+  // The surface stays alive until the recycling mechanism in NextSurface
+  // determines it is no longer needed (because the swap chain has grown too
+  // long) or until DiscardBackbuffers() is called or the layer is destroyed.
+  // During the surface's lifetime, it will continuously move through the fields
+  // mInProgressSurface, mFrontSurface, and back to front through the mSurfaces
+  // queue:
+  //
+  //  mSurfaces.front()
+  //  ------[NextSurface()]-----> mInProgressSurface
+  //  --[NotifySurfaceReady()]--> mFrontSurface
+  //  --[NotifySurfaceReady()]--> mSurfaces.back()  --> .... -->
+  //  mSurfaces.front()
+  //
+  // We mark an IOSurface as "in use" as long as it is either in
+  // mInProgressSurface. When it is in mFrontSurface or in the mSurfaces queue,
+  // it is not marked as "in use" by us - but it can be "in use" by the window
+  // server. Consequently, IOSurfaceIsInUse on a surface from mSurfaces reflects
+  // whether the window server is still reading from the surface, and we can use
+  // this indicator to decide when to recycle the surface.
+  //
+  // Users of NativeLayerCA normally proceed in this order:
+  //  1. Begin a frame by calling NextSurface to get the surface.
+  //  2. Draw to the surface.
+  //  3. Mark the surface as done by calling NotifySurfaceReady.
+  //  4. Call NativeLayerRoot::CommitToScreen(), which calls ApplyChanges()
+  //     during a CATransaction.
+
+  // The surface we returned from the most recent call to NextSurface, before
+  // the matching call to NotifySurfaceReady.
+  // Will only be Some() between calls to NextSurface and NotifySurfaceReady.
+  Maybe<SurfaceWithInvalidRegion> mInProgressSurface;
+  Maybe<gfx::IntRegion> mInProgressUpdateRegion;
+  Maybe<gfx::IntRect> mInProgressDisplayRect;
+
+  // The surface that the most recent call to NotifySurfaceReady was for.
+  // Will be Some() after the first call to NotifySurfaceReady, for the rest of
+  // the layer's life time.
+  Maybe<SurfaceWithInvalidRegion> mFrontSurface;
+
+  // The queue of surfaces which make up the rest of our "swap chain".
+  // mSurfaces.front() is the next surface we'll attempt to use.
+  // mSurfaces.back() is the one that was used most recently.
+  std::vector<SurfaceWithInvalidRegionAndCheckCount> mSurfaces;
+
+  // Non-null between calls to NextSurfaceAsDrawTarget and NotifySurfaceReady.
+  RefPtr<MacIOSurface> mInProgressLockedIOSurface;
+
+  RefPtr<SurfacePoolHandleCA> mSurfacePoolHandle;
+  RefPtr<wr::RenderMacIOSurfaceTextureHost> mTextureHost;
+
+  Representation mOnscreenRepresentation;
+  Representation mOffscreenRepresentation;
+
+  gfx::IntPoint mPosition;
+  gfx::Matrix4x4 mTransform;
+  gfx::IntRect mDisplayRect;
+  gfx::IntSize mSize;
+  Maybe<gfx::IntRect> mClipRect;
+  gfx::SamplingFilter mSamplingFilter = gfx::SamplingFilter::POINT;
+  float mBackingScale = 1.0f;
+  bool mSurfaceIsFlipped = false;
+  CFTypeRefPtr<CGColorRef> mColor;
+  const bool mIsOpaque = false;
+  bool mRootWindowIsFullscreen = false;
+  bool mSpecializeVideo = false;
+  bool mHasExtent = false;
+  bool mIsDRM = false;
+
+#ifdef NIGHTLY_BUILD
+  // Track the consistency of our caller's API usage. Layers that are drawn
+  // should only ever be called with NotifySurfaceReady. Layers that are
+  // external should only ever be called with AttachExternalImage.
+  bool mHasEverAttachExternalImage = false;
+  bool mHasEverNotifySurfaceReady = false;
+#endif
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // mozilla_layers_NativeLayerCA_h