Adding upstream version 86.0.1.upstream/86.0.1upstream

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

1 files changed, 784 insertions, 0 deletions

diff --git a/gfx/webrender_bindings/WebRenderAPI.h b/gfx/webrender_bindings/WebRenderAPI.h
new file mode 100644
index 0000000000..9ab65b0784
--- /dev/null
+++ b/gfx/webrender_bindings/WebRenderAPI.h
@@ -0,0 +1,784 @@
+/* -*- 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_LAYERS_WEBRENDERAPI_H
+#define MOZILLA_LAYERS_WEBRENDERAPI_H
+
+#include <vector>
+#include <unordered_map>
+#include <unordered_set>
+
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/gfx/CompositorHitTestInfo.h"
+#include "mozilla/layers/IpcResourceUpdateQueue.h"
+#include "mozilla/layers/ScrollableLayerGuid.h"
+#include "mozilla/layers/SyncObject.h"
+#include "mozilla/layers/CompositionRecorder.h"
+#include "mozilla/MozPromise.h"
+#include "mozilla/Range.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/webrender/webrender_ffi.h"
+#include "mozilla/webrender/WebRenderTypes.h"
+#include "GLTypes.h"
+#include "Units.h"
+
+class gfxContext;
+class nsDisplayItem;
+class nsPaintedDisplayItem;
+class nsDisplayTransform;
+
+#undef None
+
+namespace mozilla {
+
+struct ActiveScrolledRoot;
+
+namespace widget {
+class CompositorWidget;
+}
+
+namespace layers {
+class CompositorBridgeParent;
+class DisplayItemCache;
+class WebRenderBridgeParent;
+class RenderRootStateManager;
+class StackingContextHelper;
+struct DisplayListData;
+}  // namespace layers
+
+namespace layout {
+class TextDrawTarget;
+}
+
+namespace wr {
+
+class DisplayListBuilder;
+class RendererOGL;
+class RendererEvent;
+
+// This isn't part of WR's API, but we define it here to simplify layout's
+// logic and data plumbing.
+struct Line {
+  wr::LayoutRect bounds;
+  float wavyLineThickness;
+  wr::LineOrientation orientation;
+  wr::ColorF color;
+  wr::LineStyle style;
+};
+
+/// A handler that can be bundled into a transaction and notified at specific
+/// points in the rendering pipeline, such as after scene building or after
+/// frame building.
+///
+/// If for any reason the handler is dropped before reaching the requested
+/// point, it is notified with the value Checkpoint::TransactionDropped.
+/// So it is safe to assume that the handler will be notified "at some point".
+class NotificationHandler {
+ public:
+  virtual void Notify(wr::Checkpoint aCheckpoint) = 0;
+  virtual ~NotificationHandler() = default;
+};
+
+struct WrHitResult {
+  layers::LayersId mLayersId;
+  layers::ScrollableLayerGuid::ViewID mScrollId;
+  gfx::CompositorHitTestInfo mHitInfo;
+  SideBits mSideBits;
+};
+
+class TransactionBuilder final {
+ public:
+  explicit TransactionBuilder(bool aUseSceneBuilderThread = true);
+
+  ~TransactionBuilder();
+
+  void SetLowPriority(bool aIsLowPriority);
+
+  void UpdateEpoch(PipelineId aPipelineId, Epoch aEpoch);
+
+  void SetRootPipeline(PipelineId aPipelineId);
+
+  void RemovePipeline(PipelineId aPipelineId);
+
+  void SetDisplayList(const gfx::DeviceColor& aBgColor, Epoch aEpoch,
+                      const wr::LayoutSize& aViewportSize,
+                      wr::WrPipelineId pipeline_id,
+                      wr::BuiltDisplayListDescriptor dl_descriptor,
+                      wr::Vec<uint8_t>& dl_data);
+
+  void ClearDisplayList(Epoch aEpoch, wr::WrPipelineId aPipeline);
+
+  void GenerateFrame(const VsyncId& aVsyncId);
+
+  void InvalidateRenderedFrame();
+
+  void UpdateDynamicProperties(
+      const nsTArray<wr::WrOpacityProperty>& aOpacityArray,
+      const nsTArray<wr::WrTransformProperty>& aTransformArray,
+      const nsTArray<wr::WrColorProperty>& aColorArray);
+
+  void SetDocumentView(const LayoutDeviceIntRect& aDocRect);
+
+  void UpdateScrollPosition(
+      const wr::WrPipelineId& aPipelineId,
+      const layers::ScrollableLayerGuid::ViewID& aScrollId,
+      const wr::LayoutPoint& aScrollPosition);
+
+  bool IsEmpty() const;
+
+  bool IsResourceUpdatesEmpty() const;
+
+  bool IsRenderedFrameInvalidated() const;
+
+  void AddImage(wr::ImageKey aKey, const ImageDescriptor& aDescriptor,
+                wr::Vec<uint8_t>& aBytes);
+
+  void AddBlobImage(wr::BlobImageKey aKey, const ImageDescriptor& aDescriptor,
+                    wr::Vec<uint8_t>& aBytes,
+                    const wr::DeviceIntRect& aVisibleRect);
+
+  void AddExternalImageBuffer(ImageKey key, const ImageDescriptor& aDescriptor,
+                              ExternalImageId aHandle);
+
+  void AddExternalImage(ImageKey key, const ImageDescriptor& aDescriptor,
+                        ExternalImageId aExtID,
+                        wr::ExternalImageType aImageType,
+                        uint8_t aChannelIndex = 0);
+
+  void UpdateImageBuffer(wr::ImageKey aKey, const ImageDescriptor& aDescriptor,
+                         wr::Vec<uint8_t>& aBytes);
+
+  void UpdateBlobImage(wr::BlobImageKey aKey,
+                       const ImageDescriptor& aDescriptor,
+                       wr::Vec<uint8_t>& aBytes,
+                       const wr::DeviceIntRect& aVisibleRect,
+                       const wr::LayoutIntRect& aDirtyRect);
+
+  void UpdateExternalImage(ImageKey aKey, const ImageDescriptor& aDescriptor,
+                           ExternalImageId aExtID,
+                           wr::ExternalImageType aImageType,
+                           uint8_t aChannelIndex = 0);
+
+  void UpdateExternalImageWithDirtyRect(ImageKey aKey,
+                                        const ImageDescriptor& aDescriptor,
+                                        ExternalImageId aExtID,
+                                        wr::ExternalImageType aImageType,
+                                        const wr::DeviceIntRect& aDirtyRect,
+                                        uint8_t aChannelIndex = 0);
+
+  void SetBlobImageVisibleArea(BlobImageKey aKey,
+                               const wr::DeviceIntRect& aArea);
+
+  void DeleteImage(wr::ImageKey aKey);
+
+  void DeleteBlobImage(wr::BlobImageKey aKey);
+
+  void AddRawFont(wr::FontKey aKey, wr::Vec<uint8_t>& aBytes, uint32_t aIndex);
+
+  void AddFontDescriptor(wr::FontKey aKey, wr::Vec<uint8_t>& aBytes,
+                         uint32_t aIndex);
+
+  void DeleteFont(wr::FontKey aKey);
+
+  void AddFontInstance(wr::FontInstanceKey aKey, wr::FontKey aFontKey,
+                       float aGlyphSize,
+                       const wr::FontInstanceOptions* aOptions,
+                       const wr::FontInstancePlatformOptions* aPlatformOptions,
+                       wr::Vec<uint8_t>& aVariations);
+
+  void DeleteFontInstance(wr::FontInstanceKey aKey);
+
+  void UpdateQualitySettings(bool aForceSubpixelAAWherePossible);
+
+  void Notify(wr::Checkpoint aWhen, UniquePtr<NotificationHandler> aHandler);
+
+  void Clear();
+
+  bool UseSceneBuilderThread() const { return mUseSceneBuilderThread; }
+  Transaction* Raw() { return mTxn; }
+
+ protected:
+  bool mUseSceneBuilderThread;
+  Transaction* mTxn;
+};
+
+class TransactionWrapper final {
+ public:
+  explicit TransactionWrapper(Transaction* aTxn);
+
+  void UpdateDynamicProperties(
+      const nsTArray<wr::WrOpacityProperty>& aOpacityArray,
+      const nsTArray<wr::WrTransformProperty>& aTransformArray,
+      const nsTArray<wr::WrColorProperty>& aColorArray);
+  void AppendTransformProperties(
+      const nsTArray<wr::WrTransformProperty>& aTransformArray);
+  void UpdateScrollPosition(
+      const wr::WrPipelineId& aPipelineId,
+      const layers::ScrollableLayerGuid::ViewID& aScrollId,
+      const wr::LayoutPoint& aScrollPosition);
+  void UpdatePinchZoom(float aZoom);
+  void UpdateIsTransformAsyncZooming(uint64_t aAnimationId, bool aIsZooming);
+
+ private:
+  Transaction* mTxn;
+};
+
+class WebRenderAPI final {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(WebRenderAPI);
+
+ public:
+  /// This can be called on the compositor thread only.
+  static already_AddRefed<WebRenderAPI> Create(
+      layers::CompositorBridgeParent* aBridge,
+      RefPtr<widget::CompositorWidget>&& aWidget,
+      const wr::WrWindowId& aWindowId, LayoutDeviceIntSize aSize,
+      layers::WindowKind aWindowKind, nsACString& aError);
+
+  already_AddRefed<WebRenderAPI> Clone();
+
+  wr::WindowId GetId() const { return mId; }
+
+  /// Do a non-blocking hit-testing query on a shared version of the hit
+  /// testing information.
+  std::vector<WrHitResult> HitTest(const wr::WorldPoint& aPoint);
+
+  void SendTransaction(TransactionBuilder& aTxn);
+
+  void SetFrameStartTime(const TimeStamp& aTime);
+
+  void RunOnRenderThread(UniquePtr<RendererEvent> aEvent);
+
+  void Readback(const TimeStamp& aStartTime, gfx::IntSize aSize,
+                const gfx::SurfaceFormat& aFormat,
+                const Range<uint8_t>& aBuffer, bool* aNeedsYFlip);
+
+  void ClearAllCaches();
+  void EnableNativeCompositor(bool aEnable);
+  void EnableMultithreading(bool aEnable);
+  void SetBatchingLookback(uint32_t aCount);
+
+  void SetClearColor(const gfx::DeviceColor& aColor);
+  void SetProfilerUI(const nsCString& aUIString);
+
+  void Pause();
+  bool Resume();
+
+  void WakeSceneBuilder();
+  void FlushSceneBuilder();
+
+  void NotifyMemoryPressure();
+  void AccumulateMemoryReport(wr::MemoryReport*);
+
+  wr::WrIdNamespace GetNamespace();
+  layers::WebRenderBackend GetBackendType() { return mBackend; }
+  layers::WebRenderCompositor GetCompositorType() { return mCompositor; }
+  uint32_t GetMaxTextureSize() const { return mMaxTextureSize; }
+  bool GetUseANGLE() const { return mUseANGLE; }
+  bool GetUseDComp() const { return mUseDComp; }
+  bool GetUseTripleBuffering() const { return mUseTripleBuffering; }
+  bool SupportsExternalBufferTextures() const {
+    return mSupportsExternalBufferTextures;
+  }
+  layers::SyncHandle GetSyncHandle() const { return mSyncHandle; }
+
+  void Capture();
+
+  void ToggleCaptureSequence();
+
+  void BeginRecording(const TimeStamp& aRecordingStart,
+                      wr::PipelineId aRootPipelineId);
+
+  typedef MozPromise<bool, nsresult, true> WriteCollectedFramesPromise;
+  typedef MozPromise<layers::CollectedFrames, nsresult, true>
+      GetCollectedFramesPromise;
+
+  /**
+   * Write the frames collected since the call to BeginRecording() to disk.
+   *
+   * If there is not currently a recorder, this is a no-op.
+   */
+  RefPtr<WriteCollectedFramesPromise> WriteCollectedFrames();
+
+  /**
+   * Return the frames collected since the call to BeginRecording() encoded
+   * as data URIs.
+   *
+   * If there is not currently a recorder, this is a no-op and the promise will
+   * be rejected.
+   */
+  RefPtr<GetCollectedFramesPromise> GetCollectedFrames();
+
+ protected:
+  WebRenderAPI(wr::DocumentHandle* aHandle, wr::WindowId aId,
+               layers::WebRenderBackend aBackend,
+               layers::WebRenderCompositor aCompositor,
+               uint32_t aMaxTextureSize, bool aUseANGLE, bool aUseDComp,
+               bool aUseTripleBuffering, bool aSupportsExternalBufferTextures,
+               layers::SyncHandle aSyncHandle);
+
+  ~WebRenderAPI();
+  // Should be used only for shutdown handling
+  void WaitFlushed();
+
+  void UpdateDebugFlags(uint32_t aFlags);
+
+  wr::DocumentHandle* mDocHandle;
+  wr::WindowId mId;
+  layers::WebRenderBackend mBackend;
+  layers::WebRenderCompositor mCompositor;
+  int32_t mMaxTextureSize;
+  bool mUseANGLE;
+  bool mUseDComp;
+  bool mUseTripleBuffering;
+  bool mSupportsExternalBufferTextures;
+  bool mCaptureSequence;
+  layers::SyncHandle mSyncHandle;
+
+  // We maintain alive the root api to know when to shut the render backend
+  // down, and the root api for the document to know when to delete the
+  // document. mRootApi is null for the api object that owns the channel (and is
+  // responsible for shutting it down), and mRootDocumentApi is null for the api
+  // object owning (and responsible for destroying) a given document. All api
+  // objects in the same window use the same channel, and some api objects write
+  // to the same document (but there is only one owner for each channel and for
+  // each document).
+  RefPtr<wr::WebRenderAPI> mRootApi;
+  RefPtr<wr::WebRenderAPI> mRootDocumentApi;
+
+  friend class DisplayListBuilder;
+  friend class layers::WebRenderBridgeParent;
+};
+
+// This is a RAII class that automatically sends the transaction on
+// destruction. This is useful for code that has multiple exit points and we
+// want to ensure that the stuff accumulated in the transaction gets sent
+// regardless of which exit we take. Note that if the caller explicitly calls
+// mApi->SendTransaction() that's fine too because that empties out the
+// TransactionBuilder and leaves it as a valid empty transaction, so calling
+// SendTransaction on it again ends up being a no-op.
+class MOZ_RAII AutoTransactionSender {
+ public:
+  AutoTransactionSender(WebRenderAPI* aApi, TransactionBuilder* aTxn)
+      : mApi(aApi), mTxn(aTxn) {}
+
+  ~AutoTransactionSender() { mApi->SendTransaction(*mTxn); }
+
+ private:
+  WebRenderAPI* mApi;
+  TransactionBuilder* mTxn;
+};
+
+/**
+ * A set of optional parameters for stacking context creation.
+ */
+struct MOZ_STACK_CLASS StackingContextParams : public WrStackingContextParams {
+  StackingContextParams()
+      : WrStackingContextParams{
+            WrStackingContextClip::None(),
+            nullptr,
+            nullptr,
+            nullptr,
+            wr::TransformStyle::Flat,
+            wr::WrReferenceFrameKind::Transform,
+            nullptr,
+            /* prim_flags = */ wr::PrimitiveFlags::IS_BACKFACE_VISIBLE,
+            wr::MixBlendMode::Normal,
+            wr::StackingContextFlags{0}} {}
+
+  void SetPreserve3D(bool aPreserve) {
+    transform_style =
+        aPreserve ? wr::TransformStyle::Preserve3D : wr::TransformStyle::Flat;
+  }
+
+  nsTArray<wr::FilterOp> mFilters;
+  nsTArray<wr::WrFilterData> mFilterDatas;
+  wr::LayoutRect mBounds = wr::ToLayoutRect(LayoutDeviceRect());
+  const gfx::Matrix4x4* mBoundTransform = nullptr;
+  const gfx::Matrix4x4* mTransformPtr = nullptr;
+  Maybe<nsDisplayTransform*> mDeferredTransformItem;
+  // Whether the stacking context is possibly animated. This alters how
+  // coordinates are transformed/snapped to invalidate less when transforms
+  // change frequently.
+  bool mAnimated = false;
+  // Whether items should be rasterized in a local space that is (mostly)
+  // invariant to transforms, i.e. disabling subpixel AA and screen space pixel
+  // snapping on text runs that would only make sense in screen space.
+  bool mRasterizeLocally = false;
+};
+
+/// This is a simple C++ wrapper around WrState defined in the rust bindings.
+/// We may want to turn this into a direct wrapper on top of
+/// WebRenderFrameBuilder instead, so the interface may change a bit.
+class DisplayListBuilder final {
+ public:
+  explicit DisplayListBuilder(wr::PipelineId aId, size_t aCapacity = 0,
+                              layers::DisplayItemCache* aCache = nullptr);
+  DisplayListBuilder(DisplayListBuilder&&) = default;
+
+  ~DisplayListBuilder();
+
+  void Save();
+  void Restore();
+  void ClearSave();
+
+  usize Dump(usize aIndent, const Maybe<usize>& aStart,
+             const Maybe<usize>& aEnd);
+  void DumpSerializedDisplayList();
+
+  void Finalize(wr::BuiltDisplayList& aOutDisplayList);
+  void Finalize(layers::DisplayListData& aOutTransaction);
+
+  Maybe<wr::WrSpatialId> PushStackingContext(
+      const StackingContextParams& aParams, const wr::LayoutRect& aBounds,
+      const wr::RasterSpace& aRasterSpace);
+  void PopStackingContext(bool aIsReferenceFrame);
+
+  wr::WrClipChainId DefineClipChain(const nsTArray<wr::WrClipId>& aClips,
+                                    bool aParentWithCurrentChain = false);
+
+  wr::WrClipId DefineClip(
+      const Maybe<wr::WrSpaceAndClip>& aParent, const wr::LayoutRect& aClipRect,
+      const nsTArray<wr::ComplexClipRegion>* aComplex = nullptr);
+
+  wr::WrClipId DefineImageMaskClip(const wr::ImageMask& aMask);
+  wr::WrClipId DefineRoundedRectClip(const wr::ComplexClipRegion& aComplex);
+  wr::WrClipId DefineRectClip(wr::LayoutRect aClipRect);
+
+  wr::WrSpatialId DefineStickyFrame(const wr::LayoutRect& aContentRect,
+                                    const float* aTopMargin,
+                                    const float* aRightMargin,
+                                    const float* aBottomMargin,
+                                    const float* aLeftMargin,
+                                    const StickyOffsetBounds& aVerticalBounds,
+                                    const StickyOffsetBounds& aHorizontalBounds,
+                                    const wr::LayoutVector2D& aAppliedOffset);
+
+  Maybe<wr::WrSpaceAndClip> GetScrollIdForDefinedScrollLayer(
+      layers::ScrollableLayerGuid::ViewID aViewId) const;
+  wr::WrSpaceAndClip DefineScrollLayer(
+      const layers::ScrollableLayerGuid::ViewID& aViewId,
+      const Maybe<wr::WrSpaceAndClip>& aParent,
+      const wr::LayoutRect& aContentRect, const wr::LayoutRect& aClipRect,
+      const wr::LayoutPoint& aScrollOffset);
+
+  void PushRect(const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+                bool aIsBackfaceVisible, const wr::ColorF& aColor);
+  void PushRectWithAnimation(const wr::LayoutRect& aBounds,
+                             const wr::LayoutRect& aClip,
+                             bool aIsBackfaceVisible, const wr::ColorF& aColor,
+                             const WrAnimationProperty* aAnimation);
+  void PushRoundedRect(const wr::LayoutRect& aBounds,
+                       const wr::LayoutRect& aClip, bool aIsBackfaceVisible,
+                       const wr::ColorF& aColor);
+  void PushHitTest(const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+                   bool aIsBackfaceVisible,
+                   const layers::ScrollableLayerGuid::ViewID& aScrollId,
+                   gfx::CompositorHitTestInfo aHitInfo, SideBits aSideBits);
+  void PushClearRect(const wr::LayoutRect& aBounds);
+  void PushClearRectWithComplexRegion(const wr::LayoutRect& aBounds,
+                                      const wr::ComplexClipRegion& aRegion);
+
+  void PushBackdropFilter(const wr::LayoutRect& aBounds,
+                          const wr::ComplexClipRegion& aRegion,
+                          const nsTArray<wr::FilterOp>& aFilters,
+                          const nsTArray<wr::WrFilterData>& aFilterDatas,
+                          bool aIsBackfaceVisible);
+
+  void PushLinearGradient(const wr::LayoutRect& aBounds,
+                          const wr::LayoutRect& aClip, bool aIsBackfaceVisible,
+                          const wr::LayoutPoint& aStartPoint,
+                          const wr::LayoutPoint& aEndPoint,
+                          const nsTArray<wr::GradientStop>& aStops,
+                          wr::ExtendMode aExtendMode,
+                          const wr::LayoutSize aTileSize,
+                          const wr::LayoutSize aTileSpacing);
+
+  void PushRadialGradient(const wr::LayoutRect& aBounds,
+                          const wr::LayoutRect& aClip, bool aIsBackfaceVisible,
+                          const wr::LayoutPoint& aCenter,
+                          const wr::LayoutSize& aRadius,
+                          const nsTArray<wr::GradientStop>& aStops,
+                          wr::ExtendMode aExtendMode,
+                          const wr::LayoutSize aTileSize,
+                          const wr::LayoutSize aTileSpacing);
+
+  void PushConicGradient(const wr::LayoutRect& aBounds,
+                         const wr::LayoutRect& aClip, bool aIsBackfaceVisible,
+                         const wr::LayoutPoint& aCenter, const float aAngle,
+                         const nsTArray<wr::GradientStop>& aStops,
+                         wr::ExtendMode aExtendMode,
+                         const wr::LayoutSize aTileSize,
+                         const wr::LayoutSize aTileSpacing);
+
+  void PushImage(const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+                 bool aIsBackfaceVisible, wr::ImageRendering aFilter,
+                 wr::ImageKey aImage, bool aPremultipliedAlpha = true,
+                 const wr::ColorF& aColor = wr::ColorF{1.0f, 1.0f, 1.0f, 1.0f},
+                 bool aPreferCompositorSurface = false,
+                 bool aSupportsExternalCompositing = false);
+
+  void PushRepeatingImage(
+      const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+      bool aIsBackfaceVisible, const wr::LayoutSize& aStretchSize,
+      const wr::LayoutSize& aTileSpacing, wr::ImageRendering aFilter,
+      wr::ImageKey aImage, bool aPremultipliedAlpha = true,
+      const wr::ColorF& aColor = wr::ColorF{1.0f, 1.0f, 1.0f, 1.0f});
+
+  void PushYCbCrPlanarImage(
+      const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+      bool aIsBackfaceVisible, wr::ImageKey aImageChannel0,
+      wr::ImageKey aImageChannel1, wr::ImageKey aImageChannel2,
+      wr::WrColorDepth aColorDepth, wr::WrYuvColorSpace aColorSpace,
+      wr::WrColorRange aColorRange, wr::ImageRendering aFilter,
+      bool aPreferCompositorSurface = false,
+      bool aSupportsExternalCompositing = false);
+
+  void PushNV12Image(const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+                     bool aIsBackfaceVisible, wr::ImageKey aImageChannel0,
+                     wr::ImageKey aImageChannel1, wr::WrColorDepth aColorDepth,
+                     wr::WrYuvColorSpace aColorSpace,
+                     wr::WrColorRange aColorRange, wr::ImageRendering aFilter,
+                     bool aPreferCompositorSurface = false,
+                     bool aSupportsExternalCompositing = false);
+
+  void PushYCbCrInterleavedImage(
+      const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+      bool aIsBackfaceVisible, wr::ImageKey aImageChannel0,
+      wr::WrColorDepth aColorDepth, wr::WrYuvColorSpace aColorSpace,
+      wr::WrColorRange aColorRange, wr::ImageRendering aFilter,
+      bool aPreferCompositorSurface = false,
+      bool aSupportsExternalCompositing = false);
+
+  void PushIFrame(const wr::LayoutRect& aBounds, bool aIsBackfaceVisible,
+                  wr::PipelineId aPipeline, bool aIgnoreMissingPipeline);
+
+  // XXX WrBorderSides are passed with Range.
+  // It is just to bypass compiler bug. See Bug 1357734.
+  void PushBorder(const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+                  bool aIsBackfaceVisible, const wr::LayoutSideOffsets& aWidths,
+                  const Range<const wr::BorderSide>& aSides,
+                  const wr::BorderRadius& aRadius,
+                  wr::AntialiasBorder = wr::AntialiasBorder::Yes);
+
+  void PushBorderImage(const wr::LayoutRect& aBounds,
+                       const wr::LayoutRect& aClip, bool aIsBackfaceVisible,
+                       const wr::WrBorderImage& aParams);
+
+  void PushBorderGradient(const wr::LayoutRect& aBounds,
+                          const wr::LayoutRect& aClip, bool aIsBackfaceVisible,
+                          const wr::LayoutSideOffsets& aWidths,
+                          const int32_t aWidth, const int32_t aHeight,
+                          bool aFill, const wr::DeviceIntSideOffsets& aSlice,
+                          const wr::LayoutPoint& aStartPoint,
+                          const wr::LayoutPoint& aEndPoint,
+                          const nsTArray<wr::GradientStop>& aStops,
+                          wr::ExtendMode aExtendMode,
+                          const wr::LayoutSideOffsets& aOutset);
+
+  void PushBorderRadialGradient(
+      const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+      bool aIsBackfaceVisible, const wr::LayoutSideOffsets& aWidths, bool aFill,
+      const wr::LayoutPoint& aCenter, const wr::LayoutSize& aRadius,
+      const nsTArray<wr::GradientStop>& aStops, wr::ExtendMode aExtendMode,
+      const wr::LayoutSideOffsets& aOutset);
+
+  void PushBorderConicGradient(
+      const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+      bool aIsBackfaceVisible, const wr::LayoutSideOffsets& aWidths, bool aFill,
+      const wr::LayoutPoint& aCenter, const float aAngle,
+      const nsTArray<wr::GradientStop>& aStops, wr::ExtendMode aExtendMode,
+      const wr::LayoutSideOffsets& aOutset);
+
+  void PushText(const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+                bool aIsBackfaceVisible, const wr::ColorF& aColor,
+                wr::FontInstanceKey aFontKey,
+                Range<const wr::GlyphInstance> aGlyphBuffer,
+                const wr::GlyphOptions* aGlyphOptions = nullptr);
+
+  void PushLine(const wr::LayoutRect& aClip, bool aIsBackfaceVisible,
+                const wr::Line& aLine);
+
+  void PushShadow(const wr::LayoutRect& aBounds, const wr::LayoutRect& aClip,
+                  bool aIsBackfaceVisible, const wr::Shadow& aShadow,
+                  bool aShouldInflate);
+
+  void PopAllShadows();
+
+  void PushBoxShadow(const wr::LayoutRect& aRect, const wr::LayoutRect& aClip,
+                     bool aIsBackfaceVisible, const wr::LayoutRect& aBoxBounds,
+                     const wr::LayoutVector2D& aOffset,
+                     const wr::ColorF& aColor, const float& aBlurRadius,
+                     const float& aSpreadRadius,
+                     const wr::BorderRadius& aBorderRadius,
+                     const wr::BoxShadowClipMode& aClipMode);
+
+  /**
+   * Notifies the DisplayListBuilder that it can group together WR display items
+   * that are pushed until |CancelGroup()| or |FinishGroup()| call.
+   */
+  void StartGroup(nsPaintedDisplayItem* aItem);
+
+  /**
+   * Cancels grouping of the display items and discards all the display items
+   * pushed between the |StartGroup()| and |CancelGroup()| calls.
+   */
+  void CancelGroup(const bool aDiscard = false);
+
+  /**
+   * Finishes the display item group. The group is stored in WebRender backend,
+   * and can be reused with |ReuseItem()|, if the Gecko display item is reused.
+   */
+  void FinishGroup();
+
+  /**
+   * Try to reuse the previously created WebRender display items for the given
+   * Gecko display item |aItem|.
+   * Returns true if the items were reused, otherwise returns false.
+   */
+  bool ReuseItem(nsPaintedDisplayItem* aItem);
+
+  uint64_t CurrentClipChainId() const {
+    return mCurrentSpaceAndClipChain.clip_chain;
+  }
+
+  const wr::WrSpaceAndClipChain& CurrentSpaceAndClipChain() const {
+    return mCurrentSpaceAndClipChain;
+  }
+
+  const wr::PipelineId& CurrentPipelineId() const { return mPipelineId; }
+
+  // Checks to see if the innermost enclosing fixed pos item has the same
+  // ASR. If so, it returns the scroll target for that fixed-pos item.
+  // Otherwise, it returns Nothing().
+  Maybe<layers::ScrollableLayerGuid::ViewID> GetContainingFixedPosScrollTarget(
+      const ActiveScrolledRoot* aAsr);
+
+  Maybe<SideBits> GetContainingFixedPosSideBits(const ActiveScrolledRoot* aAsr);
+
+  already_AddRefed<gfxContext> GetTextContext(
+      wr::IpcResourceUpdateQueue& aResources,
+      const layers::StackingContextHelper& aSc,
+      layers::RenderRootStateManager* aManager, nsDisplayItem* aItem,
+      nsRect& aBounds, const gfx::Point& aDeviceOffset);
+
+  // Try to avoid using this when possible.
+  wr::WrState* Raw() { return mWrState; }
+
+  void SetClipChainLeaf(const Maybe<wr::LayoutRect>& aClipRect) {
+    mClipChainLeaf = aClipRect;
+  }
+
+  // A chain of RAII objects, each holding a (ASR, ViewID, SideBits) tuple of
+  // data. The topmost object is pointed to by the mActiveFixedPosTracker
+  // pointer in the wr::DisplayListBuilder.
+  class MOZ_RAII FixedPosScrollTargetTracker final {
+   public:
+    FixedPosScrollTargetTracker(DisplayListBuilder& aBuilder,
+                                const ActiveScrolledRoot* aAsr,
+                                layers::ScrollableLayerGuid::ViewID aScrollId,
+                                SideBits aSideBits);
+    ~FixedPosScrollTargetTracker();
+    Maybe<layers::ScrollableLayerGuid::ViewID> GetScrollTargetForASR(
+        const ActiveScrolledRoot* aAsr);
+    Maybe<SideBits> GetSideBitsForASR(const ActiveScrolledRoot* aAsr);
+
+   private:
+    FixedPosScrollTargetTracker* mParentTracker;
+    DisplayListBuilder& mBuilder;
+    const ActiveScrolledRoot* mAsr;
+    layers::ScrollableLayerGuid::ViewID mScrollId;
+    SideBits mSideBits;
+  };
+
+ protected:
+  wr::LayoutRect MergeClipLeaf(const wr::LayoutRect& aClip) {
+    if (mClipChainLeaf) {
+      return wr::IntersectLayoutRect(*mClipChainLeaf, aClip);
+    }
+    return aClip;
+  }
+
+  // See the implementation of PushShadow for details on these methods.
+  void SuspendClipLeafMerging();
+  void ResumeClipLeafMerging();
+
+  wr::WrState* mWrState;
+
+  // Track each scroll id that we encountered. We use this structure to
+  // ensure that we don't define a particular scroll layer multiple times,
+  // as that results in undefined behaviour in WR.
+  std::unordered_map<layers::ScrollableLayerGuid::ViewID, wr::WrSpaceAndClip>
+      mScrollIds;
+
+  wr::WrSpaceAndClipChain mCurrentSpaceAndClipChain;
+
+  // Contains the current leaf of the clip chain to be merged with the
+  // display item's clip rect when pushing an item. May be set to Nothing() if
+  // there is no clip rect to merge with.
+  Maybe<wr::LayoutRect> mClipChainLeaf;
+
+  // Versions of the above that are on hold while SuspendClipLeafMerging is on
+  // (see the implementation of PushShadow for details).
+  Maybe<wr::WrSpaceAndClipChain> mSuspendedSpaceAndClipChain;
+  Maybe<wr::LayoutRect> mSuspendedClipChainLeaf;
+
+  RefPtr<layout::TextDrawTarget> mCachedTextDT;
+  RefPtr<gfxContext> mCachedContext;
+
+  FixedPosScrollTargetTracker* mActiveFixedPosTracker;
+
+  wr::PipelineId mPipelineId;
+  wr::LayoutSize mContentSize;
+
+  nsTArray<wr::PipelineId> mRemotePipelineIds;
+
+  layers::DisplayItemCache* mDisplayItemCache;
+  Maybe<uint16_t> mCurrentCacheSlot;
+
+  friend class WebRenderAPI;
+  friend class SpaceAndClipChainHelper;
+};
+
+// This is a RAII class that overrides the current Wr's SpatialId and
+// ClipChainId.
+class MOZ_RAII SpaceAndClipChainHelper final {
+ public:
+  SpaceAndClipChainHelper(DisplayListBuilder& aBuilder,
+                          wr::WrSpaceAndClipChain aSpaceAndClipChain)
+      : mBuilder(aBuilder),
+        mOldSpaceAndClipChain(aBuilder.mCurrentSpaceAndClipChain) {
+    aBuilder.mCurrentSpaceAndClipChain = aSpaceAndClipChain;
+  }
+  SpaceAndClipChainHelper(DisplayListBuilder& aBuilder,
+                          wr::WrSpatialId aSpatialId)
+      : mBuilder(aBuilder),
+        mOldSpaceAndClipChain(aBuilder.mCurrentSpaceAndClipChain) {
+    aBuilder.mCurrentSpaceAndClipChain.space = aSpatialId;
+  }
+  SpaceAndClipChainHelper(DisplayListBuilder& aBuilder,
+                          wr::WrClipChainId aClipChainId)
+      : mBuilder(aBuilder),
+        mOldSpaceAndClipChain(aBuilder.mCurrentSpaceAndClipChain) {
+    aBuilder.mCurrentSpaceAndClipChain.clip_chain = aClipChainId.id;
+  }
+
+  ~SpaceAndClipChainHelper() {
+    mBuilder.mCurrentSpaceAndClipChain = mOldSpaceAndClipChain;
+  }
+
+ private:
+  SpaceAndClipChainHelper(const SpaceAndClipChainHelper&) = delete;
+
+  DisplayListBuilder& mBuilder;
+  wr::WrSpaceAndClipChain mOldSpaceAndClipChain;
+};
+
+Maybe<wr::ImageFormat> SurfaceFormatToImageFormat(gfx::SurfaceFormat aFormat);
+
+}  // namespace wr
+}  // namespace mozilla
+
+#endif