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, 416 insertions, 0 deletions

diff --git a/gfx/layers/Compositor.h b/gfx/layers/Compositor.h
new file mode 100644
index 0000000000..b4e05674a8
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+++ b/gfx/layers/Compositor.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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_GFX_COMPOSITOR_H
+#define MOZILLA_GFX_COMPOSITOR_H
+
+#include "Units.h"                           // for ScreenPoint
+#include "mozilla/Assertions.h"              // for MOZ_ASSERT, etc
+#include "mozilla/RefPtr.h"                  // for already_AddRefed, RefCounted
+#include "mozilla/gfx/2D.h"                  // for DrawTarget
+#include "mozilla/gfx/MatrixFwd.h"           // for Matrix, Matrix4x4
+#include "mozilla/gfx/Point.h"               // for IntSize, Point
+#include "mozilla/gfx/Polygon.h"             // for Polygon
+#include "mozilla/gfx/Rect.h"                // for Rect, IntRect
+#include "mozilla/gfx/Types.h"               // for Float
+#include "mozilla/gfx/Triangle.h"            // for Triangle, TexturedTriangle
+#include "mozilla/layers/CompositorTypes.h"  // for DiagnosticTypes, etc
+#include "mozilla/layers/LayersTypes.h"      // for LayersBackend
+#include "mozilla/layers/SurfacePool.h"      // for SurfacePoolHandle
+#include "mozilla/layers/TextureSourceProvider.h"
+#include "mozilla/widget/CompositorWidget.h"
+#include "nsISupportsImpl.h"  // for MOZ_COUNT_CTOR, etc
+#include "nsRegion.h"
+#include <vector>
+#include "mozilla/WidgetUtils.h"
+
+/**
+ * Different elements of a web pages are rendered into separate "layers" before
+ * they are flattened into the final image that is brought to the screen.
+ * See Layers.h for more informations about layers and why we use retained
+ * structures.
+ * Most of the documentation for layers is directly in the source code in the
+ * form of doc comments. An overview can also be found in the the wiki:
+ * https://wiki.mozilla.org/Gecko:Overview#Graphics
+ *
+ *
+ * # Main interfaces and abstractions
+ *
+ *  - CompositableClient and CompositableHost
+ *    (client/CompositableClient.h composite/CompositableHost.h)
+ *  - TextureClient and TextureHost
+ *    (client/TextureClient.h composite/TextureHost.h)
+ *  - TextureSource
+ *    (composite/TextureHost.h)
+ *  - Forwarders
+ *    (ipc/CompositableForwarder.h ipc/ShadowLayers.h)
+ *  - Compositor
+ *    (this file)
+ *  - IPDL protocols
+ *    (.ipdl files under the gfx/layers/ipc directory)
+ *
+ * The *Client and Shadowable* classes are always used on the content thread.
+ * Forwarders are always used on the content thread.
+ * The *Host and Shadow* classes are always used on the compositor thread.
+ * Compositors, TextureSource, and Effects are always used on the compositor
+ * thread.
+ * Most enums and constants are declared in LayersTypes.h and CompositorTypes.h.
+ *
+ *
+ * # Texture transfer
+ *
+ * Most layer classes own a Compositable plus some extra information like
+ * transforms and clip rects. They are platform independent.
+ * Compositable classes manipulate Texture objects and are reponsible for
+ * things like tiling, buffer rotation or double buffering. Compositables
+ * are also platform-independent. Examples of compositable classes are:
+ *  - ImageClient
+ *  - CanvasClient
+ *  - etc.
+ * Texture classes (TextureClient and TextureHost) are thin abstractions over
+ * platform-dependent texture memory. They are maniplulated by compositables
+ * and don't know about buffer rotations and such. The purposes of TextureClient
+ * and TextureHost are to synchronize, serialize and deserialize texture data.
+ * TextureHosts provide access to TextureSources that are views on the
+ * Texture data providing the necessary api for Compositor backend to composite
+ * them.
+ *
+ * Compositable and Texture clients and hosts are created using factory methods.
+ * They should only be created by using their constructor in exceptional
+ * circumstances. The factory methods are located:
+ *    TextureClient       - CompositableClient::CreateTextureClient
+ *    TextureHost         - TextureHost::CreateTextureHost, which calls a
+ *                          platform-specific function, e.g.,
+ * CreateTextureHostOGL CompositableClient  - in the appropriate subclass, e.g.,
+ *                          CanvasClient::CreateCanvasClient
+ *    CompositableHost    - CompositableHost::Create
+ *
+ *
+ * # IPDL
+ *
+ * If off-main-thread compositing (OMTC) is enabled, compositing is performed
+ * in a dedicated thread. In some setups compositing happens in a dedicated
+ * process. Documentation may refer to either the compositor thread or the
+ * compositor process.
+ * See explanations in ShadowLayers.h.
+ *
+ *
+ * # Backend implementations
+ *
+ * Compositor backends like OpenGL or flavours of D3D live in their own
+ * directory under gfx/layers/. To add a new backend, implement at least the
+ * following interfaces:
+ * - Compositor (ex. CompositorOGL)
+ * - TextureHost (ex. SurfaceTextureHost)
+ * Depending on the type of data that needs to be serialized, you may need to
+ * add specific TextureClient implementations.
+ */
+
+class nsIWidget;
+
+namespace mozilla {
+namespace gfx {
+class DrawTarget;
+class DataSourceSurface;
+}  // namespace gfx
+
+namespace layers {
+
+struct Effect;
+struct EffectChain;
+class Image;
+class Layer;
+class TextureSource;
+class DataTextureSource;
+class CompositingRenderTarget;
+class CompositorBridgeParent;
+class NativeLayer;
+class CompositorOGL;
+class CompositorD3D11;
+class TextureReadLock;
+struct GPUStats;
+class AsyncReadbackBuffer;
+class RecordedFrame;
+
+enum SurfaceInitMode { INIT_MODE_NONE, INIT_MODE_CLEAR };
+
+/**
+ * Common interface for compositor backends.
+ *
+ * Compositor provides a cross-platform interface to a set of operations for
+ * compositing quads. Compositor knows nothing about the layer tree. It must be
+ * told everything about each composited quad - contents, location, transform,
+ * opacity, etc.
+ *
+ * In theory it should be possible for different widgets to use the same
+ * compositor. In practice, we use one compositor per window.
+ *
+ * # Usage
+ *
+ * For an example of a user of Compositor, see LayerManagerComposite.
+ *
+ * Initialization: create a Compositor object, call Initialize().
+ *
+ * Destruction: destroy any resources associated with the compositor, call
+ * Destroy(), delete the Compositor object.
+ *
+ * Composition:
+ *  call BeginFrame,
+ *  for each quad to be composited:
+ *    call MakeCurrent if necessary (not necessary if no other context has been
+ *      made current),
+ *    take care of any texture upload required to composite the quad, this step
+ *      is backend-dependent,
+ *    construct an EffectChain for the quad,
+ *    call DrawQuad,
+ *  call EndFrame.
+ *
+ * By default, the compositor will render to the screen if BeginFrameForWindow
+ * is called. To render to a target, call BeginFrameForTarget or
+ * or SetRenderTarget, the latter with a target created
+ * by CreateRenderTarget or CreateRenderTargetFromSource.
+ *
+ * The target and viewport methods can be called before any DrawQuad call and
+ * affect any subsequent DrawQuad calls.
+ */
+class Compositor : public TextureSourceProvider {
+ protected:
+  virtual ~Compositor();
+
+ public:
+  explicit Compositor(widget::CompositorWidget* aWidget);
+
+  bool IsValid() const override { return true; }
+
+  virtual bool Initialize(nsCString* const out_failureReason) = 0;
+  void Destroy() override;
+  bool IsDestroyed() const { return mIsDestroyed; }
+
+  /**
+   * Creates a Surface that can be used as a rendering target by this
+   * compositor.
+   */
+  virtual already_AddRefed<CompositingRenderTarget> CreateRenderTarget(
+      const gfx::IntRect& aRect, SurfaceInitMode aInit) = 0;
+
+  /**
+   * Grab a snapshot of aSource and store it in aDest, so that the pixels can
+   * be read on the CPU by mapping aDest at some point in the future.
+   * aSource and aDest must have the same size.
+   * If this is a GPU compositor, this call must not block on the GPU.
+   * Returns whether the operation was successful.
+   */
+  virtual bool ReadbackRenderTarget(CompositingRenderTarget* aSource,
+                                    AsyncReadbackBuffer* aDest) = 0;
+
+  /**
+   * Create an AsyncReadbackBuffer of the specified size. Can return null.
+   */
+  virtual already_AddRefed<AsyncReadbackBuffer> CreateAsyncReadbackBuffer(
+      const gfx::IntSize& aSize) = 0;
+
+  /**
+   * Draw a part of aSource into the current render target.
+   * Scaling is done with linear filtering.
+   * Returns whether the operation was successful.
+   */
+  virtual bool BlitRenderTarget(CompositingRenderTarget* aSource,
+                                const gfx::IntSize& aSourceSize,
+                                const gfx::IntSize& aDestSize) = 0;
+
+  /**
+   * Sets the given surface as the target for subsequent calls to DrawQuad.
+   * Passing null as aSurface sets the screen as the target.
+   */
+  virtual void SetRenderTarget(CompositingRenderTarget* aSurface) = 0;
+
+  /**
+   * Returns the current target for rendering. Will return null if we are
+   * rendering to the screen.
+   */
+  virtual already_AddRefed<CompositingRenderTarget> GetCurrentRenderTarget()
+      const = 0;
+
+  /**
+   * Returns a render target which contains the entire window's drawing.
+   * On platforms where no such render target is used during compositing (e.g.
+   * with buffered BasicCompositor, where only the invalid area is drawn to a
+   * render target), this will return null.
+   */
+  virtual already_AddRefed<CompositingRenderTarget> GetWindowRenderTarget()
+      const = 0;
+
+  /**
+   * Mostly the compositor will pull the size from a widget and this method will
+   * be ignored, but compositor implementations are free to use it if they like.
+   */
+  virtual void SetDestinationSurfaceSize(const gfx::IntSize& aSize) = 0;
+
+  /**
+   * Tell the compositor to draw a quad. What to do draw and how it is
+   * drawn is specified by aEffectChain. aRect is the quad to draw, in user
+   * space. aTransform transforms from user space to screen space. If texture
+   * coords are required, these will be in the primary effect in the effect
+   * chain. aVisibleRect is used to determine which edges should be antialiased,
+   * without applying the effect to the inner edges of a tiled layer.
+   */
+  virtual void DrawQuad(const gfx::Rect& aRect, const gfx::IntRect& aClipRect,
+                        const EffectChain& aEffectChain, gfx::Float aOpacity,
+                        const gfx::Matrix4x4& aTransform,
+                        const gfx::Rect& aVisibleRect) = 0;
+
+  void SetClearColor(const gfx::DeviceColor& aColor) { mClearColor = aColor; }
+
+  /**
+   * Start a new frame for rendering to the window.
+   * Needs to be paired with a call to EndFrame() if the return value is not
+   * Nothing().
+   *
+   * aInvalidRegion is the invalid region of the window.
+   * aClipRect is the clip rect for all drawing (optional).
+   * aRenderBounds is the bounding rect for rendering.
+   * aOpaqueRegion is the area that contains opaque content.
+   * All coordinates are in window space.
+   *
+   * Returns the non-empty render bounds actually used by the compositor in
+   * window space, or Nothing() if composition should be aborted.
+   */
+  virtual Maybe<gfx::IntRect> BeginFrameForWindow(
+      const nsIntRegion& aInvalidRegion, const Maybe<gfx::IntRect>& aClipRect,
+      const gfx::IntRect& aRenderBounds, const nsIntRegion& aOpaqueRegion) = 0;
+
+  /**
+   * Flush the current frame to the screen and tidy up.
+   *
+   * Derived class overriding this should call Compositor::EndFrame.
+   */
+  virtual void EndFrame();
+
+  virtual void CancelFrame(bool aNeedFlush = true) {}
+
+#ifdef MOZ_DUMP_PAINTING
+  virtual const char* Name() const = 0;
+#endif  // MOZ_DUMP_PAINTING
+
+  virtual CompositorD3D11* AsCompositorD3D11() { return nullptr; }
+
+  Compositor* AsCompositor() override { return this; }
+
+  TimeStamp GetLastCompositionEndTime() const override {
+    return mLastCompositionEndTime;
+  }
+
+  /**
+   * Notify the compositor that composition is being paused. This allows the
+   * compositor to temporarily release any resources.
+   * Between calling Pause and Resume, compositing may fail.
+   */
+  virtual void Pause() {}
+  /**
+   * Notify the compositor that composition is being resumed. The compositor
+   * regain any resources it requires for compositing.
+   * Returns true if succeeded.
+   */
+  virtual bool Resume() { return true; }
+
+  widget::CompositorWidget* GetWidget() const { return mWidget; }
+
+  /**
+   * Request the compositor to allow recording its frames.
+   *
+   * This is a noop on |CompositorOGL|.
+   */
+  virtual void RequestAllowFrameRecording(bool aWillRecord) {
+    mRecordFrames = aWillRecord;
+  }
+
+ protected:
+  /**
+   * Whether or not the compositor should be prepared to record frames. While
+   * this returns true, compositors are expected to maintain a full window
+   * render target that they return from GetWindowRenderTarget() between
+   * NormalDrawingDone() and EndFrame().
+   *
+   * This will be true when either we are recording a profile with screenshots
+   * enabled or the |LayerManagerComposite| has requested us to record frames
+   * for the |CompositionRecorder|.
+   */
+  bool ShouldRecordFrames() const;
+
+  /**
+   * Last Composition end time.
+   */
+  TimeStamp mLastCompositionEndTime;
+
+  widget::CompositorWidget* mWidget;
+
+  bool mIsDestroyed;
+
+  gfx::DeviceColor mClearColor;
+
+  bool mRecordFrames = false;
+
+ private:
+  static LayersBackend sBackend;
+};
+
+// Returns the number of rects. (Up to 4)
+typedef gfx::Rect decomposedRectArrayT[4];
+size_t DecomposeIntoNoRepeatRects(const gfx::Rect& aRect,
+                                  const gfx::Rect& aTexCoordRect,
+                                  decomposedRectArrayT* aLayerRects,
+                                  decomposedRectArrayT* aTextureRects);
+
+static inline bool BlendOpIsMixBlendMode(gfx::CompositionOp aOp) {
+  switch (aOp) {
+    case gfx::CompositionOp::OP_MULTIPLY:
+    case gfx::CompositionOp::OP_SCREEN:
+    case gfx::CompositionOp::OP_OVERLAY:
+    case gfx::CompositionOp::OP_DARKEN:
+    case gfx::CompositionOp::OP_LIGHTEN:
+    case gfx::CompositionOp::OP_COLOR_DODGE:
+    case gfx::CompositionOp::OP_COLOR_BURN:
+    case gfx::CompositionOp::OP_HARD_LIGHT:
+    case gfx::CompositionOp::OP_SOFT_LIGHT:
+    case gfx::CompositionOp::OP_DIFFERENCE:
+    case gfx::CompositionOp::OP_EXCLUSION:
+    case gfx::CompositionOp::OP_HUE:
+    case gfx::CompositionOp::OP_SATURATION:
+    case gfx::CompositionOp::OP_COLOR:
+    case gfx::CompositionOp::OP_LUMINOSITY:
+      return true;
+    default:
+      return false;
+  }
+}
+
+class AsyncReadbackBuffer {
+ public:
+  NS_INLINE_DECL_REFCOUNTING(AsyncReadbackBuffer)
+
+  gfx::IntSize GetSize() const { return mSize; }
+  virtual bool MapAndCopyInto(gfx::DataSourceSurface* aSurface,
+                              const gfx::IntSize& aReadSize) const = 0;
+
+ protected:
+  explicit AsyncReadbackBuffer(const gfx::IntSize& aSize) : mSize(aSize) {}
+  virtual ~AsyncReadbackBuffer() = default;
+
+  gfx::IntSize mSize;
+};
+
+struct TexturedVertex {
+  float position[2];
+  float texCoords[2];
+};
+
+nsTArray<TexturedVertex> TexturedTrianglesToVertexArray(
+    const nsTArray<gfx::TexturedTriangle>& aTriangles);
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif /* MOZILLA_GFX_COMPOSITOR_H */