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diff --git a/gfx/layers/composite/TiledContentHost.h b/gfx/layers/composite/TiledContentHost.h
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+/* -*- Mode: C++; tab-width: 20; 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 GFX_TILEDCONTENTHOST_H
+#define GFX_TILEDCONTENTHOST_H
+
+#include <stdint.h> // for uint16_t
+#include <stdio.h> // for FILE
+#include <algorithm> // for swap
+#include "ContentHost.h" // for ContentHost
+#include "TiledLayerBuffer.h" // for TiledLayerBuffer, etc
+#include "CompositableHost.h"
+#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
+#include "mozilla/Attributes.h" // for override
+#include "mozilla/RefPtr.h" // for RefPtr
+#include "mozilla/gfx/MatrixFwd.h" // for Matrix4x4
+#include "mozilla/gfx/Point.h" // for Point
+#include "mozilla/gfx/Rect.h" // for Rect
+#include "mozilla/gfx/Types.h" // for SamplingFilter
+#include "mozilla/layers/CompositorTypes.h" // for TextureInfo, etc
+#include "mozilla/layers/LayersSurfaces.h" // for SurfaceDescriptor
+#include "mozilla/layers/LayersTypes.h" // for LayerRenderState, etc
+#include "mozilla/layers/TextureHost.h" // for TextureHost
+#include "mozilla/layers/TextureClient.h"
+#include "mozilla/mozalloc.h" // for operator delete
+#include "nsRegion.h" // for nsIntRegion
+#include "nscore.h" // for nsACString
+
+namespace mozilla {
+
+namespace layers {
+
+class Compositor;
+class ISurfaceAllocator;
+class Layer;
+class ThebesBufferData;
+class TextureReadLock;
+struct EffectChain;
+
+
+class TileHost {
+public:
+ // Constructs a placeholder TileHost. See the comments above
+ // TiledLayerBuffer for more information on what this is used for;
+ // essentially, this is a sentinel used to represent an invalid or blank
+ // tile.
+ TileHost()
+ {}
+
+ // Constructs a TileHost from a TextureReadLock and TextureHost.
+ TileHost(TextureReadLock* aSharedLock,
+ TextureHost* aTextureHost,
+ TextureHost* aTextureHostOnWhite,
+ TextureSource* aSource,
+ TextureSource* aSourceOnWhite)
+ : mTextureHost(aTextureHost)
+ , mTextureHostOnWhite(aTextureHostOnWhite)
+ , mTextureSource(aSource)
+ , mTextureSourceOnWhite(aSourceOnWhite)
+ {}
+
+ TileHost(const TileHost& o) {
+ mTextureHost = o.mTextureHost;
+ mTextureHostOnWhite = o.mTextureHostOnWhite;
+ mTextureSource = o.mTextureSource;
+ mTextureSourceOnWhite = o.mTextureSourceOnWhite;
+ mTilePosition = o.mTilePosition;
+ }
+ TileHost& operator=(const TileHost& o) {
+ if (this == &o) {
+ return *this;
+ }
+ mTextureHost = o.mTextureHost;
+ mTextureHostOnWhite = o.mTextureHostOnWhite;
+ mTextureSource = o.mTextureSource;
+ mTextureSourceOnWhite = o.mTextureSourceOnWhite;
+ mTilePosition = o.mTilePosition;
+ return *this;
+ }
+
+ bool operator== (const TileHost& o) const {
+ return mTextureHost == o.mTextureHost;
+ }
+ bool operator!= (const TileHost& o) const {
+ return mTextureHost != o.mTextureHost;
+ }
+
+ bool IsPlaceholderTile() const { return mTextureHost == nullptr; }
+
+ void Dump(std::stringstream& aStream) {
+ aStream << "TileHost(...)"; // fill in as needed
+ }
+
+ void DumpTexture(std::stringstream& aStream, TextureDumpMode /* aCompress, ignored for host tiles */) {
+ // TODO We should combine the OnWhite/OnBlack here an just output a single image.
+ CompositableHost::DumpTextureHost(aStream, mTextureHost);
+ }
+
+ /**
+ * This does a linear tween of the passed opacity (which is assumed
+ * to be between 0.0 and 1.0). The duration of the fade is controlled
+ * by the 'layers.tiles.fade-in.duration-ms' preference. It is enabled
+ * via 'layers.tiles.fade-in.enabled'
+ */
+ float GetFadeInOpacity(float aOpacity);
+
+ CompositableTextureHostRef mTextureHost;
+ CompositableTextureHostRef mTextureHostOnWhite;
+ mutable CompositableTextureSourceRef mTextureSource;
+ mutable CompositableTextureSourceRef mTextureSourceOnWhite;
+ // This is not strictly necessary but makes debugging whole lot easier.
+ TileIntPoint mTilePosition;
+ TimeStamp mFadeStart;
+};
+
+class TiledLayerBufferComposite
+ : public TiledLayerBuffer<TiledLayerBufferComposite, TileHost>
+{
+ friend class TiledLayerBuffer<TiledLayerBufferComposite, TileHost>;
+
+public:
+ TiledLayerBufferComposite();
+ ~TiledLayerBufferComposite();
+
+ bool UseTiles(const SurfaceDescriptorTiles& aTileDescriptors,
+ Compositor* aCompositor,
+ ISurfaceAllocator* aAllocator);
+
+ void Clear();
+
+ TileHost GetPlaceholderTile() const { return TileHost(); }
+
+ // Stores the absolute resolution of the containing frame, calculated
+ // by the sum of the resolutions of all parent layers' FrameMetrics.
+ const CSSToParentLayerScale2D& GetFrameResolution() { return mFrameResolution; }
+
+ void SetCompositor(Compositor* aCompositor);
+
+ void AddAnimationInvalidation(nsIntRegion& aRegion);
+protected:
+
+ CSSToParentLayerScale2D mFrameResolution;
+};
+
+/**
+ * ContentHost for tiled PaintedLayers. Since tiled layers are special snow
+ * flakes, we have a unique update process. All the textures that back the
+ * tiles are added in the usual way, but Updated is called on the host side
+ * in response to a message that describes the transaction for every tile.
+ * Composition happens in the normal way.
+ *
+ * TiledContentHost has a TiledLayerBufferComposite which keeps hold of the tiles.
+ * Each tile has a reference to a texture host. During the layers transaction, we
+ * receive a list of descriptors for the client-side tile buffer tiles
+ * (UseTiledLayerBuffer). If we receive two transactions before a composition,
+ * we immediately unlock and discard the unused buffer.
+ *
+ * When the content host is composited, we first validate the TiledLayerBuffer
+ * (Upload), which calls Updated on each tile's texture host to make sure the
+ * texture data has been uploaded. For single-buffered tiles, we unlock at this
+ * point, for double-buffered tiles we unlock and discard the last composited
+ * buffer after compositing a new one. Rendering takes us to RenderTile which
+ * is similar to Composite for non-tiled ContentHosts.
+ */
+class TiledContentHost : public ContentHost
+{
+public:
+ explicit TiledContentHost(const TextureInfo& aTextureInfo);
+
+protected:
+ ~TiledContentHost();
+
+public:
+ virtual LayerRenderState GetRenderState() override
+ {
+ // If we have exactly one high precision tile, then we can support hwc.
+ if (mTiledBuffer.GetTileCount() == 1 &&
+ mLowPrecisionTiledBuffer.GetTileCount() == 0) {
+ TextureHost* host = mTiledBuffer.GetTile(0).mTextureHost;
+ if (host) {
+ MOZ_ASSERT(!mTiledBuffer.GetTile(0).mTextureHostOnWhite, "Component alpha not supported!");
+
+ gfx::IntPoint offset = mTiledBuffer.GetTileOffset(mTiledBuffer.GetPlacement().TilePosition(0));
+
+ // Don't try to use HWC if the content doesn't start at the top-left of the tile.
+ if (offset != GetValidRegion().GetBounds().TopLeft()) {
+ return LayerRenderState();
+ }
+
+ LayerRenderState state = host->GetRenderState();
+ state.SetOffset(offset);
+ return state;
+ }
+ }
+ return LayerRenderState();
+ }
+
+ // Generate effect for layerscope when using hwc.
+ virtual already_AddRefed<TexturedEffect> GenEffect(const gfx::SamplingFilter aSamplingFilter) override;
+
+ virtual bool UpdateThebes(const ThebesBufferData& aData,
+ const nsIntRegion& aUpdated,
+ const nsIntRegion& aOldValidRegionBack,
+ nsIntRegion* aUpdatedRegionBack) override
+ {
+ NS_ERROR("N/A for tiled layers");
+ return false;
+ }
+
+ const nsIntRegion& GetValidLowPrecisionRegion() const
+ {
+ return mLowPrecisionTiledBuffer.GetValidRegion();
+ }
+
+ const nsIntRegion& GetValidRegion() const
+ {
+ return mTiledBuffer.GetValidRegion();
+ }
+
+ virtual void SetCompositor(Compositor* aCompositor) override
+ {
+ MOZ_ASSERT(aCompositor);
+ CompositableHost::SetCompositor(aCompositor);
+ mTiledBuffer.SetCompositor(aCompositor);
+ mLowPrecisionTiledBuffer.SetCompositor(aCompositor);
+ }
+
+ bool UseTiledLayerBuffer(ISurfaceAllocator* aAllocator,
+ const SurfaceDescriptorTiles& aTiledDescriptor);
+
+ virtual void Composite(LayerComposite* aLayer,
+ EffectChain& aEffectChain,
+ float aOpacity,
+ const gfx::Matrix4x4& aTransform,
+ const gfx::SamplingFilter aSamplingFilter,
+ const gfx::IntRect& aClipRect,
+ const nsIntRegion* aVisibleRegion = nullptr) override;
+
+ virtual CompositableType GetType() override { return CompositableType::CONTENT_TILED; }
+
+ virtual TiledContentHost* AsTiledContentHost() override { return this; }
+
+ virtual void Attach(Layer* aLayer,
+ Compositor* aCompositor,
+ AttachFlags aFlags = NO_FLAGS) override;
+
+ virtual void Detach(Layer* aLayer = nullptr,
+ AttachFlags aFlags = NO_FLAGS) override;
+
+ virtual void Dump(std::stringstream& aStream,
+ const char* aPrefix="",
+ bool aDumpHtml=false) override;
+
+ virtual void PrintInfo(std::stringstream& aStream, const char* aPrefix) override;
+
+ virtual void AddAnimationInvalidation(nsIntRegion& aRegion) override;
+
+private:
+
+ void RenderLayerBuffer(TiledLayerBufferComposite& aLayerBuffer,
+ const gfx::Color* aBackgroundColor,
+ EffectChain& aEffectChain,
+ float aOpacity,
+ const gfx::SamplingFilter aSamplingFilter,
+ const gfx::IntRect& aClipRect,
+ nsIntRegion aMaskRegion,
+ gfx::Matrix4x4 aTransform);
+
+ // Renders a single given tile.
+ void RenderTile(TileHost& aTile,
+ EffectChain& aEffectChain,
+ float aOpacity,
+ const gfx::Matrix4x4& aTransform,
+ const gfx::SamplingFilter aSamplingFilter,
+ const gfx::IntRect& aClipRect,
+ const nsIntRegion& aScreenRegion,
+ const gfx::IntPoint& aTextureOffset,
+ const gfx::IntSize& aTextureBounds,
+ const gfx::Rect& aVisibleRect);
+
+ void EnsureTileStore() {}
+
+ TiledLayerBufferComposite mTiledBuffer;
+ TiledLayerBufferComposite mLowPrecisionTiledBuffer;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif
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