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diff --git a/gfx/layers/basic/BasicCompositor.h b/gfx/layers/basic/BasicCompositor.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_BASICCOMPOSITOR_H
+#define MOZILLA_GFX_BASICCOMPOSITOR_H
+
+#include "mozilla/layers/Compositor.h"
+#include "mozilla/layers/TextureHost.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/Triangle.h"
+#include "mozilla/gfx/Polygon.h"
+
+namespace mozilla {
+namespace layers {
+
+class BasicCompositingRenderTarget : public CompositingRenderTarget {
+ public:
+  BasicCompositingRenderTarget(gfx::DrawTarget* aDrawTarget,
+                               const gfx::IntRect& aRect,
+                               const gfx::IntPoint& aClipSpaceOrigin)
+      : CompositingRenderTarget(aRect.TopLeft()),
+        mDrawTarget(aDrawTarget),
+        mSize(aRect.Size()),
+        mClipSpaceOrigin(aClipSpaceOrigin) {}
+
+  const char* Name() const override { return "BasicCompositingRenderTarget"; }
+
+  gfx::IntSize GetSize() const override { return mSize; }
+
+  // The point that DrawGeometry's aClipRect is relative to. Will be (0, 0) for
+  // root render targets and equal to GetOrigin() for non-root render targets.
+  gfx::IntPoint GetClipSpaceOrigin() const { return mClipSpaceOrigin; }
+
+  // In render target coordinates, i.e. the same space as GetOrigin().
+  // NOT relative to mClipSpaceOrigin!
+  void SetClipRect(const Maybe<gfx::IntRect>& aRect) { mClipRect = aRect; }
+  const Maybe<gfx::IntRect>& GetClipRect() const { return mClipRect; }
+
+  void BindRenderTarget();
+
+  gfx::SurfaceFormat GetFormat() const override {
+    return mDrawTarget ? mDrawTarget->GetFormat()
+                       : gfx::SurfaceFormat(gfx::SurfaceFormat::UNKNOWN);
+  }
+
+  RefPtr<gfx::DrawTarget> mDrawTarget;
+  gfx::IntSize mSize;
+  gfx::IntPoint mClipSpaceOrigin;
+  Maybe<gfx::IntRect> mClipRect;
+};
+
+class BasicCompositor : public Compositor {
+ public:
+  BasicCompositor(CompositorBridgeParent* aParent,
+                  widget::CompositorWidget* aWidget);
+
+ protected:
+  virtual ~BasicCompositor();
+
+ public:
+  BasicCompositor* AsBasicCompositor() override { return this; }
+
+  bool Initialize(nsCString* const out_failureReason) override;
+
+  void Destroy() override;
+
+  TextureFactoryIdentifier GetTextureFactoryIdentifier() override;
+
+  already_AddRefed<CompositingRenderTarget> CreateRenderTarget(
+      const gfx::IntRect& aRect, SurfaceInitMode aInit) override;
+
+  already_AddRefed<CompositingRenderTarget> CreateRenderTargetFromSource(
+      const gfx::IntRect& aRect, const CompositingRenderTarget* aSource,
+      const gfx::IntPoint& aSourcePoint) override;
+
+  virtual already_AddRefed<CompositingRenderTarget> CreateRootRenderTarget(
+      gfx::DrawTarget* aDrawTarget, const gfx::IntRect& aDrawTargetRect,
+      const gfx::IntRegion& aClearRegion);
+
+  already_AddRefed<DataTextureSource> CreateDataTextureSource(
+      TextureFlags aFlags = TextureFlags::NO_FLAGS) override;
+
+  already_AddRefed<DataTextureSource> CreateDataTextureSourceAround(
+      gfx::DataSourceSurface* aSurface) override;
+
+  already_AddRefed<DataTextureSource> CreateDataTextureSourceAroundYCbCr(
+      TextureHost* aTexture) override;
+
+  bool SupportsEffect(EffectTypes aEffect) override;
+
+  bool SupportsLayerGeometry() const override;
+
+  bool ReadbackRenderTarget(CompositingRenderTarget* aSource,
+                            AsyncReadbackBuffer* aDest) override;
+
+  already_AddRefed<AsyncReadbackBuffer> CreateAsyncReadbackBuffer(
+      const gfx::IntSize& aSize) override;
+
+  bool BlitRenderTarget(CompositingRenderTarget* aSource,
+                        const gfx::IntSize& aSourceSize,
+                        const gfx::IntSize& aDestSize) override;
+
+  void SetRenderTarget(CompositingRenderTarget* aSource) override {
+    mRenderTarget = static_cast<BasicCompositingRenderTarget*>(aSource);
+    mRenderTarget->BindRenderTarget();
+  }
+
+  already_AddRefed<CompositingRenderTarget> GetWindowRenderTarget()
+      const override {
+    return do_AddRef(mFullWindowRenderTarget);
+  }
+
+  already_AddRefed<CompositingRenderTarget> GetCurrentRenderTarget()
+      const override {
+    return do_AddRef(mRenderTarget);
+  }
+
+  void DrawQuad(const gfx::Rect& aRect, const gfx::IntRect& aClipRect,
+                const EffectChain& aEffectChain, gfx::Float aOpacity,
+                const gfx::Matrix4x4& aTransform,
+                const gfx::Rect& aVisibleRect) override;
+
+  void ClearRect(const gfx::Rect& aRect) override;
+
+  Maybe<gfx::IntRect> BeginFrameForWindow(
+      const nsIntRegion& aInvalidRegion, const Maybe<gfx::IntRect>& aClipRect,
+      const gfx::IntRect& aRenderBounds,
+      const nsIntRegion& aOpaqueRegion) override;
+
+  Maybe<gfx::IntRect> BeginFrameForTarget(
+      const nsIntRegion& aInvalidRegion, const Maybe<gfx::IntRect>& aClipRect,
+      const gfx::IntRect& aRenderBounds, const nsIntRegion& aOpaqueRegion,
+      gfx::DrawTarget* aTarget, const gfx::IntRect& aTargetBounds) override;
+
+  void BeginFrameForNativeLayers() override;
+
+  Maybe<gfx::IntRect> BeginRenderingToNativeLayer(
+      const nsIntRegion& aInvalidRegion, const Maybe<gfx::IntRect>& aClipRect,
+      const nsIntRegion& aOpaqueRegion, NativeLayer* aNativeLayer) override;
+
+  void EndRenderingToNativeLayer() override;
+
+  void NormalDrawingDone() override;
+  void EndFrame() override;
+
+  RefPtr<SurfacePoolHandle> GetSurfacePoolHandle() override;
+
+  bool SupportsPartialTextureUpdate() override { return true; }
+  bool CanUseCanvasLayerForSize(const gfx::IntSize& aSize) override {
+    return true;
+  }
+  int32_t GetMaxTextureSize() const override;
+  void SetDestinationSurfaceSize(const gfx::IntSize& aSize) override {}
+
+  void MakeCurrent(MakeCurrentFlags aFlags = 0) override {}
+
+#ifdef MOZ_DUMP_PAINTING
+  const char* Name() const override { return "Basic"; }
+#endif  // MOZ_DUMP_PAINTING
+
+  LayersBackend GetBackendType() const override {
+    return LayersBackend::LAYERS_BASIC;
+  }
+
+  bool IsPendingComposite() override { return mIsPendingEndRemoteDrawing; }
+
+  void FinishPendingComposite() override;
+
+ private:
+  template <typename Geometry>
+  void DrawGeometry(const Geometry& aGeometry, const gfx::Rect& aRect,
+                    const gfx::IntRect& aClipRect,
+                    const EffectChain& aEffectChain, gfx::Float aOpacity,
+                    const gfx::Matrix4x4& aTransform,
+                    const gfx::Rect& aVisibleRect, const bool aEnableAA);
+
+  void DrawPolygon(const gfx::Polygon& aPolygon, const gfx::Rect& aRect,
+                   const gfx::IntRect& aClipRect,
+                   const EffectChain& aEffectChain, gfx::Float aOpacity,
+                   const gfx::Matrix4x4& aTransform,
+                   const gfx::Rect& aVisibleRect) override;
+
+  void TryToEndRemoteDrawing();
+  void EndRemoteDrawing();
+
+  bool NeedsToDeferEndRemoteDrawing();
+
+  bool NeedToRecreateFullWindowRenderTarget() const;
+
+  // When rendering to a back buffer, this is the front buffer that the contents
+  // of the back buffer need to be copied to. Only non-null between
+  // BeginFrameForWindow and EndRemoteDrawing, and only when using a back
+  // buffer.
+  RefPtr<gfx::DrawTarget> mFrontBuffer;
+
+  // The current render target for drawing
+  RefPtr<BasicCompositingRenderTarget> mRenderTarget;
+
+  // The native layer that we're currently rendering to, if any.
+  // Non-null only between BeginFrameForWindow and EndFrame if
+  // BeginFrameForWindow has been called with a non-null aNativeLayer.
+  RefPtr<NativeLayer> mCurrentNativeLayer;
+
+  RefPtr<SurfacePoolHandle> mSurfacePoolHandle;
+
+  gfx::IntRegion mInvalidRegion;
+
+  uint32_t mMaxTextureSize;
+  bool mIsPendingEndRemoteDrawing;
+  bool mShouldInvalidateWindow = false;
+
+  // Where the current frame is being rendered to.
+  enum class FrameDestination : uint8_t {
+    NO_CURRENT_FRAME,  // before BeginFrameForXYZ or after EndFrame
+    WINDOW,            // between BeginFrameForWindow and EndFrame
+    TARGET,            // between BeginFrameForTarget and EndFrame
+    NATIVE_LAYERS      // between BeginFrameForNativeLayers and EndFrame
+  };
+  FrameDestination mCurrentFrameDest = FrameDestination::NO_CURRENT_FRAME;
+
+  // mDrawTarget will not be the full window on all platforms. We therefore need
+  // to keep a full window render target around when we are capturing
+  // screenshots on those platforms.
+  RefPtr<BasicCompositingRenderTarget> mFullWindowRenderTarget;
+
+  // The 1x1 dummy render target that's the "current" render target between
+  // BeginFrameForNativeLayers and EndFrame but outside pairs of
+  // Begin/EndRenderingToNativeLayer. Created on demand.
+  RefPtr<CompositingRenderTarget> mNativeLayersReferenceRT;
+};
+
+BasicCompositor* AssertBasicCompositor(Compositor* aCompositor);
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif /* MOZILLA_GFX_BASICCOMPOSITOR_H */