/* -*- 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/. */ #include "mozilla/DebugOnly.h" #include "FrameLayerBuilder.h" #include "mozilla/gfx/Matrix.h" #include "nsDisplayList.h" #include "nsPresContext.h" #include "nsLayoutUtils.h" #include "Layers.h" #include "BasicLayers.h" #include "gfxUtils.h" #include "nsRenderingContext.h" #include "MaskLayerImageCache.h" #include "nsIScrollableFrame.h" #include "nsPrintfCString.h" #include "LayerTreeInvalidation.h" #include "nsSVGIntegrationUtils.h" #include "ImageContainer.h" #include "ActiveLayerTracker.h" #include "gfx2DGlue.h" #include "mozilla/LookAndFeel.h" #include "GeckoProfiler.h" #include "mozilla/gfx/Tools.h" #include "mozilla/gfx/2D.h" #include "gfxPrefs.h" #include using namespace mozilla::layers; using namespace mozilla::gfx; namespace mozilla { FrameLayerBuilder::DisplayItemData::DisplayItemData(LayerManagerData* aParent, uint32_t aKey, nsIFrame* aFrame) : mParent(aParent) , mLayer(nullptr) , mDisplayItemKey(aKey) , mItem(nullptr) , mUsed(true) , mIsInvalid(false) { if (aFrame) { AddFrame(aFrame); } } FrameLayerBuilder::DisplayItemData::DisplayItemData(DisplayItemData &toCopy) { // This isn't actually a copy-constructor; notice that it steals toCopy's // mGeometry pointer. Be careful. mParent = toCopy.mParent; mLayer = toCopy.mLayer; mInactiveManager = toCopy.mInactiveManager; mFrameList = toCopy.mFrameList; mGeometry = toCopy.mGeometry; mDisplayItemKey = toCopy.mDisplayItemKey; mClip = toCopy.mClip; mContainerLayerGeneration = toCopy.mContainerLayerGeneration; mLayerState = toCopy.mLayerState; mItem = toCopy.mItem; mUsed = toCopy.mUsed; } void FrameLayerBuilder::DisplayItemData::AddFrame(nsIFrame* aFrame) { mFrameList.AppendElement(aFrame); nsTArray *array = reinterpret_cast*>(aFrame->Properties().Get(FrameLayerBuilder::LayerManagerDataProperty())); if (!array) { array = new nsTArray(); aFrame->Properties().Set(FrameLayerBuilder::LayerManagerDataProperty(), array); } array->AppendElement(this); } void FrameLayerBuilder::DisplayItemData::RemoveFrame(nsIFrame* aFrame) { DebugOnly result = mFrameList.RemoveElement(aFrame); NS_ASSERTION(result, "Can't remove a frame that wasn't added!"); nsTArray *array = reinterpret_cast*>(aFrame->Properties().Get(FrameLayerBuilder::LayerManagerDataProperty())); NS_ASSERTION(array, "Must be already stored on the frame!"); array->RemoveElement(this); } void FrameLayerBuilder::DisplayItemData::EndUpdate() { MOZ_ASSERT(!mItem); mIsInvalid = false; mUsed = false; } void FrameLayerBuilder::DisplayItemData::EndUpdate(nsAutoPtr aGeometry) { MOZ_ASSERT(mItem); mGeometry = aGeometry; mClip = mItem->GetClip(); mFrameListChanges.Clear(); mItem = nullptr; EndUpdate(); } void FrameLayerBuilder::DisplayItemData::BeginUpdate(Layer* aLayer, LayerState aState, uint32_t aContainerLayerGeneration, nsDisplayItem* aItem /* = nullptr */) { mLayer = aLayer; mOptLayer = nullptr; mInactiveManager = nullptr; mLayerState = aState; mContainerLayerGeneration = aContainerLayerGeneration; mUsed = true; if (aLayer->AsThebesLayer()) { mItem = aItem; } if (!aItem) { return; } // We avoid adding or removing element unnecessarily // since we have to modify userdata each time nsAutoTArray copy(mFrameList); if (!copy.RemoveElement(aItem->Frame())) { AddFrame(aItem->Frame()); mFrameListChanges.AppendElement(aItem->Frame()); } nsAutoTArray mergedFrames; aItem->GetMergedFrames(&mergedFrames); for (uint32_t i = 0; i < mergedFrames.Length(); ++i) { if (!copy.RemoveElement(mergedFrames[i])) { AddFrame(mergedFrames[i]); mFrameListChanges.AppendElement(mergedFrames[i]); } } for (uint32_t i = 0; i < copy.Length(); i++) { RemoveFrame(copy[i]); mFrameListChanges.AppendElement(copy[i]); } } static nsIFrame* sDestroyedFrame = nullptr; FrameLayerBuilder::DisplayItemData::~DisplayItemData() { for (uint32_t i = 0; i < mFrameList.Length(); i++) { nsIFrame* frame = mFrameList[i]; if (frame == sDestroyedFrame) { continue; } nsTArray *array = reinterpret_cast*>(frame->Properties().Get(LayerManagerDataProperty())); array->RemoveElement(this); } } const nsTArray& FrameLayerBuilder::DisplayItemData::GetFrameListChanges() { return mFrameListChanges; } /** * This is the userdata we associate with a layer manager. */ class LayerManagerData : public LayerUserData { public: LayerManagerData(LayerManager *aManager) : mLayerManager(aManager) #ifdef DEBUG_DISPLAY_ITEM_DATA , mParent(nullptr) #endif , mInvalidateAllLayers(false) { MOZ_COUNT_CTOR(LayerManagerData); } ~LayerManagerData() { MOZ_COUNT_DTOR(LayerManagerData); } #ifdef DEBUG_DISPLAY_ITEM_DATA void Dump(const char *aPrefix = "") { printf_stderr("%sLayerManagerData %p\n", aPrefix, this); nsAutoCString prefix; prefix += aPrefix; prefix += " "; mDisplayItems.EnumerateEntries( FrameLayerBuilder::DumpDisplayItemDataForFrame, (void*)prefix.get()); } #endif /** * Tracks which frames have layers associated with them. */ LayerManager *mLayerManager; #ifdef DEBUG_DISPLAY_ITEM_DATA LayerManagerData *mParent; #endif nsTHashtable > mDisplayItems; bool mInvalidateAllLayers; }; /* static */ void FrameLayerBuilder::DestroyDisplayItemDataFor(nsIFrame* aFrame) { FrameProperties props = aFrame->Properties(); props.Delete(LayerManagerDataProperty()); } // a global cache of image containers used for mask layers static MaskLayerImageCache* gMaskLayerImageCache = nullptr; static inline MaskLayerImageCache* GetMaskLayerImageCache() { if (!gMaskLayerImageCache) { gMaskLayerImageCache = new MaskLayerImageCache(); } return gMaskLayerImageCache; } /** * We keep a stack of these to represent the ThebesLayers that are * currently available to have display items added to. * We use a stack here because as much as possible we want to * assign display items to existing ThebesLayers, and to the lowest * ThebesLayer in z-order. This reduces the number of layers and * makes it more likely a display item will be rendered to an opaque * layer, giving us the best chance of getting subpixel AA. */ class ThebesLayerData { public: ThebesLayerData() : mAnimatedGeometryRoot(nullptr), mFixedPosFrameForLayerData(nullptr), mReferenceFrame(nullptr), mLayer(nullptr), mIsSolidColorInVisibleRegion(false), mSingleItemFixedToViewport(false), mNeedComponentAlpha(false), mForceTransparentSurface(false), mHideAllLayersBelow(false), mImage(nullptr), mCommonClipCount(-1), mNewChildLayersIndex(-1), mAllDrawingAbove(false) {} /** * Record that an item has been added to the ThebesLayer, so we * need to update our regions. * @param aVisibleRect the area of the item that's visible * @param aDrawRect the area of the item that would be drawn if it * was completely visible * @param aOpaqueRect if non-null, the area of the item that's opaque. * We pass in a separate opaque rect because the opaque rect can be * bigger than the visible rect, and we want to have the biggest * opaque rect that we can. * @param aSolidColor if non-null, the visible area of the item is * a constant color given by *aSolidColor */ void Accumulate(ContainerState* aState, nsDisplayItem* aItem, const nsIntRegion& aClippedOpaqueRegion, const nsIntRect& aVisibleRect, const nsIntRect& aDrawRect, const DisplayItemClip& aClip); const nsIFrame* GetAnimatedGeometryRoot() { return mAnimatedGeometryRoot; } /** * Add aHitRegion, aMaybeHitRegion, and aDispatchToContentHitRegion to the * hit regions for this ThebesLayer. */ void AccumulateEventRegions(const nsRegion& aHitRegion, const nsRegion& aMaybeHitRegion, const nsRegion& aDispatchToContentHitRegion) { mHitRegion.Or(mHitRegion, aHitRegion); mMaybeHitRegion.Or(mMaybeHitRegion, aMaybeHitRegion); mDispatchToContentHitRegion.Or(mDispatchToContentHitRegion, aDispatchToContentHitRegion); } /** * If this represents only a nsDisplayImage, and the image type * supports being optimized to an ImageLayer (TYPE_RASTER only) returns * an ImageContainer for the image. */ already_AddRefed CanOptimizeImageLayer(nsDisplayListBuilder* aBuilder); void AddDrawAboveRegion(const nsIntRegion& aAbove) { if (!mAllDrawingAbove) { mDrawAboveRegion.Or(mDrawAboveRegion, aAbove); mDrawAboveRegion.SimplifyOutward(8); } } void AddVisibleAboveRegion(const nsIntRegion& aAbove) { if (!mAllDrawingAbove) { mVisibleAboveRegion.Or(mVisibleAboveRegion, aAbove); mVisibleAboveRegion.SimplifyOutward(8); } } void CopyAboveRegion(ThebesLayerData* aOther) { if (aOther->mAllDrawingAbove || mAllDrawingAbove) { SetAllDrawingAbove(); } else { mVisibleAboveRegion.Or(mVisibleAboveRegion, aOther->mVisibleAboveRegion); mVisibleAboveRegion.Or(mVisibleAboveRegion, aOther->mVisibleRegion); mVisibleAboveRegion.SimplifyOutward(8); mDrawAboveRegion.Or(mDrawAboveRegion, aOther->mDrawAboveRegion); mDrawAboveRegion.Or(mDrawAboveRegion, aOther->mDrawRegion); mDrawAboveRegion.SimplifyOutward(8); } } void SetAllDrawingAbove() { mAllDrawingAbove = true; mDrawAboveRegion.SetEmpty(); mVisibleAboveRegion.SetEmpty(); } bool DrawAboveRegionIntersects(const nsIntRect& aRect) { return mAllDrawingAbove || mDrawAboveRegion.Intersects(aRect); } bool DrawRegionIntersects(const nsIntRect& aRect) { return IsSubjectToAsyncTransforms() || mDrawRegion.Intersects(aRect); } bool IntersectsVisibleAboveRegion(const nsIntRegion& aVisibleRegion) { if (mAllDrawingAbove) { return true; } nsIntRegion visibleAboveIntersection; visibleAboveIntersection.And(mVisibleAboveRegion, aVisibleRegion); if (visibleAboveIntersection.IsEmpty()) { return false; } return true; } bool IsSubjectToAsyncTransforms() { return mFixedPosFrameForLayerData != nullptr; } /** * The region of visible content in the layer, relative to the * container layer (which is at the snapped top-left of the display * list reference frame). */ nsIntRegion mVisibleRegion; /** * The region containing the bounds of all display items in the layer, * regardless of visbility. * Same coordinate system as mVisibleRegion. * This is a conservative approximation: it contains the true region. */ nsIntRegion mDrawRegion; /** * The region of visible content in the layer that is opaque. * Same coordinate system as mVisibleRegion. */ nsIntRegion mOpaqueRegion; /** * The definitely-hit region for this ThebesLayer. */ nsRegion mHitRegion; /** * The maybe-hit region for this ThebesLayer. */ nsRegion mMaybeHitRegion; /** * The dispatch-to-content hit region for this ThebesLayer. */ nsRegion mDispatchToContentHitRegion; /** * The "active scrolled root" for all content in the layer. Must * be non-null; all content in a ThebesLayer must have the same * active scrolled root. */ const nsIFrame* mAnimatedGeometryRoot; /** * If non-null, the frame from which we'll extract "fixed positioning" * metadata for this layer. This can be a position:fixed frame or a viewport * frame; the latter case is used for background-attachment:fixed content. */ const nsIFrame* mFixedPosFrameForLayerData; const nsIFrame* mReferenceFrame; ThebesLayer* mLayer; /** * If mIsSolidColorInVisibleRegion is true, this is the color of the visible * region. */ nscolor mSolidColor; /** * True if every pixel in mVisibleRegion will have color mSolidColor. */ bool mIsSolidColorInVisibleRegion; /** * True if the layer contains exactly one item that returned true for * ShouldFixToViewport. */ bool mSingleItemFixedToViewport; /** * True if there is any text visible in the layer that's over * transparent pixels in the layer. */ bool mNeedComponentAlpha; /** * Set if the layer should be treated as transparent, even if its entire * area is covered by opaque display items. For example, this needs to * be set if something is going to "punch holes" in the layer by clearing * part of its surface. */ bool mForceTransparentSurface; /** * Set if all layers below this ThebesLayer should be hidden. */ bool mHideAllLayersBelow; /** * Stores the pointer to the nsDisplayImage if we want to * convert this to an ImageLayer. */ nsDisplayImageContainer* mImage; /** * Stores the clip that we need to apply to the image or, if there is no * image, a clip for SOME item in the layer. There is no guarantee which * item's clip will be stored here and mItemClip should not be used to clip * the whole layer - only some part of the clip should be used, as determined * by ThebesDisplayItemLayerUserData::GetCommonClipCount() - which may even be * no part at all. */ DisplayItemClip mItemClip; /** * The first mCommonClipCount rounded rectangle clips are identical for * all items in the layer. * -1 if there are no items in the layer; must be >=0 by the time that this * data is popped from the stack. */ int32_t mCommonClipCount; /** * Index of this layer in mNewChildLayers. */ int32_t mNewChildLayersIndex; /* * Updates mCommonClipCount by checking for rounded rect clips in common * between the clip on a new item (aCurrentClip) and the common clips * on items already in the layer (the first mCommonClipCount rounded rects * in mItemClip). */ void UpdateCommonClipCount(const DisplayItemClip& aCurrentClip); private: /** * The region of visible content above the layer and below the * next ThebesLayerData currently in the stack, if any. Note that not * all ThebesLayers for the container are in the ThebesLayerData stack. * Same coordinate system as mVisibleRegion. * This is a conservative approximation: it contains the true region. */ nsIntRegion mVisibleAboveRegion; /** * The region containing the bounds of all display items (regardless * of visibility) in the layer and below the next ThebesLayerData * currently in the stack, if any. * Note that not all ThebesLayers for the container are in the * ThebesLayerData stack. * Same coordinate system as mVisibleRegion. */ nsIntRegion mDrawAboveRegion; /** * True if mDrawAboveRegion and mVisibleAboveRegion should be treated * as infinite, and all display items should be considered 'above' this layer. */ bool mAllDrawingAbove; }; struct NewLayerEntry { NewLayerEntry() : mAnimatedGeometryRoot(nullptr) , mFixedPosFrameForLayerData(nullptr) , mLayerContentsVisibleRect(0, 0, -1, -1) , mHideAllLayersBelow(false) , mOpaqueForAnimatedGeometryRootParent(false) , mPropagateComponentAlphaFlattening(true) {} // mLayer is null if the previous entry is for a ThebesLayer that hasn't // been optimized to some other form (yet). nsRefPtr mLayer; const nsIFrame* mAnimatedGeometryRoot; const nsIFrame* mFixedPosFrameForLayerData; // The following are only used for retained layers (for occlusion // culling of those layers). These regions are all relative to the // container reference frame. nsIntRegion mVisibleRegion; nsIntRegion mOpaqueRegion; // This rect is in the layer's own coordinate space. The computed visible // region for the layer cannot extend beyond this rect. nsIntRect mLayerContentsVisibleRect; bool mHideAllLayersBelow; // When mOpaqueForAnimatedGeometryRootParent is true, the opaque region of // this layer is opaque in the same position even subject to the animation of // geometry of mAnimatedGeometryRoot. For example when mAnimatedGeometryRoot // is a scrolled frame and the scrolled content is opaque everywhere in the // displayport, we can set this flag. // When this flag is set, we can treat this opaque region as covering // content whose animated geometry root is the animated geometry root for // mAnimatedGeometryRoot->GetParent(). bool mOpaqueForAnimatedGeometryRootParent; // If true, then the content flags for this layer should contribute // to our decision to flatten component alpha layers, false otherwise. bool mPropagateComponentAlphaFlattening; }; /** * This is a helper object used to build up the layer children for * a ContainerLayer. */ class ContainerState { public: ContainerState(nsDisplayListBuilder* aBuilder, LayerManager* aManager, FrameLayerBuilder* aLayerBuilder, nsIFrame* aContainerFrame, nsDisplayItem* aContainerItem, const nsRect& aContainerBounds, ContainerLayer* aContainerLayer, const ContainerLayerParameters& aParameters) : mBuilder(aBuilder), mManager(aManager), mLayerBuilder(aLayerBuilder), mContainerFrame(aContainerFrame), mContainerLayer(aContainerLayer), mContainerBounds(aContainerBounds), mParameters(aParameters), mNextFreeRecycledThebesLayer(0) { nsPresContext* presContext = aContainerFrame->PresContext(); mAppUnitsPerDevPixel = presContext->AppUnitsPerDevPixel(); mContainerReferenceFrame = const_cast(aContainerItem ? aContainerItem->ReferenceFrameForChildren() : mBuilder->FindReferenceFrameFor(mContainerFrame)); mContainerAnimatedGeometryRoot = aContainerItem ? nsLayoutUtils::GetAnimatedGeometryRootFor(aContainerItem, aBuilder, aManager) : mContainerReferenceFrame; NS_ASSERTION(!aContainerItem || !aContainerItem->ShouldFixToViewport(aManager), "Container items never return true for ShouldFixToViewport"); mContainerFixedPosFrame = FindFixedPosFrameForLayerData(mContainerAnimatedGeometryRoot, false); // When AllowResidualTranslation is false, display items will be drawn // scaled with a translation by integer pixels, so we know how the snapping // will work. mSnappingEnabled = aManager->IsSnappingEffectiveTransforms() && !mParameters.AllowResidualTranslation(); CollectOldLayers(); } enum ProcessDisplayItemsFlags { NO_COMPONENT_ALPHA = 0x01, }; /** * This is the method that actually walks a display list and builds * the child layers. */ void ProcessDisplayItems(nsDisplayList* aList, uint32_t aFlags); /** * This finalizes all the open ThebesLayers by popping every element off * mThebesLayerDataStack, then sets the children of the container layer * to be all the layers in mNewChildLayers in that order and removes any * layers as children of the container that aren't in mNewChildLayers. * @param aTextContentFlags if any child layer has CONTENT_COMPONENT_ALPHA, * set *aTextContentFlags to CONTENT_COMPONENT_ALPHA */ void Finish(uint32_t *aTextContentFlags, LayerManagerData* aData, const nsIntRect& aContainerPixelBounds, nsDisplayList* aChildItems, bool& aHasComponentAlphaChildren); nscoord GetAppUnitsPerDevPixel() { return mAppUnitsPerDevPixel; } nsIntRect ScaleToNearestPixels(const nsRect& aRect) { return aRect.ScaleToNearestPixels(mParameters.mXScale, mParameters.mYScale, mAppUnitsPerDevPixel); } nsIntRegion ScaleRegionToNearestPixels(const nsRegion& aRegion) { return aRegion.ScaleToNearestPixels(mParameters.mXScale, mParameters.mYScale, mAppUnitsPerDevPixel); } nsIntRect ScaleToOutsidePixels(const nsRect& aRect, bool aSnap = false) { if (aSnap && mSnappingEnabled) { return ScaleToNearestPixels(aRect); } return aRect.ScaleToOutsidePixels(mParameters.mXScale, mParameters.mYScale, mAppUnitsPerDevPixel); } nsIntRect ScaleToInsidePixels(const nsRect& aRect, bool aSnap = false) { if (aSnap && mSnappingEnabled) { return ScaleToNearestPixels(aRect); } return aRect.ScaleToInsidePixels(mParameters.mXScale, mParameters.mYScale, mAppUnitsPerDevPixel); } nsIntRegion ScaleRegionToInsidePixels(const nsRegion& aRegion, bool aSnap = false) { if (aSnap && mSnappingEnabled) { return ScaleRegionToNearestPixels(aRegion); } return aRegion.ScaleToInsidePixels(mParameters.mXScale, mParameters.mYScale, mAppUnitsPerDevPixel); } nsIntRegion ScaleRegionToOutsidePixels(const nsRegion& aRegion, bool aSnap = false) { if (aSnap && mSnappingEnabled) { return ScaleRegionToNearestPixels(aRegion); } return aRegion.ScaleToOutsidePixels(mParameters.mXScale, mParameters.mYScale, mAppUnitsPerDevPixel); } nsIFrame* GetContainerFrame() const { return mContainerFrame; } /** * Sets aOuterVisibleRegion as aLayer's visible region. aOuterVisibleRegion * is in the coordinate space of the container reference frame. * aLayerContentsVisibleRect, if non-null, is in the layer's own * coordinate system. */ void SetOuterVisibleRegionForLayer(Layer* aLayer, const nsIntRegion& aOuterVisibleRegion, const nsIntRect* aLayerContentsVisibleRect = nullptr) const; protected: friend class ThebesLayerData; /** * Grab the next recyclable ThebesLayer, or create one if there are no * more recyclable ThebesLayers. Does any necessary invalidation of * a recycled ThebesLayer, and sets up the transform on the ThebesLayer * to account for scrolling. */ already_AddRefed CreateOrRecycleThebesLayer(const nsIFrame* aAnimatedGeometryRoot, const nsIFrame *aReferenceFrame, const nsPoint& aTopLeft); /** * Grab the next recyclable ColorLayer, or create one if there are no * more recyclable ColorLayers. */ already_AddRefed CreateOrRecycleColorLayer(ThebesLayer* aThebes); /** * Grab the next recyclable ImageLayer, or create one if there are no * more recyclable ImageLayers. */ already_AddRefed CreateOrRecycleImageLayer(ThebesLayer* aThebes); /** * Grab a recyclable ImageLayer for use as a mask layer for aLayer (that is a * mask layer which has been used for aLayer before), or create one if such * a layer doesn't exist. */ already_AddRefed CreateOrRecycleMaskImageLayerFor(Layer* aLayer); /** * Grabs all ThebesLayers and ColorLayers from the ContainerLayer and makes them * available for recycling. */ void CollectOldLayers(); /** * If aItem used to belong to a ThebesLayer, invalidates the area of * aItem in that layer. If aNewLayer is a ThebesLayer, invalidates the area of * aItem in that layer. */ void InvalidateForLayerChange(nsDisplayItem* aItem, ThebesLayer* aNewLayer); /** * Try to determine whether the ThebesLayer at aThebesLayerIndex * has a single opaque color behind it, over the entire bounds of its visible * region. * If successful, return that color, otherwise return NS_RGBA(0,0,0,0). */ nscolor FindOpaqueBackgroundColorFor(int32_t aThebesLayerIndex); /** * Find the fixed-pos frame, if any, containing (or equal to) * aAnimatedGeometryRoot. Only return a fixed-pos frame if its viewport * has a displayport. Updates *aVisibleRegion to be the intersection of * aDrawRegion and the displayport, and updates *aIsSolidColorInVisibleRegion * (if non-null) to false if the visible region grows. * aDisplayItemFixedToViewport is true if the layer contains a single display * item which returned true for ShouldFixToViewport. * This can return the actual viewport frame for layers whose display items * are directly on the viewport (e.g. background-attachment:fixed backgrounds). */ const nsIFrame* FindFixedPosFrameForLayerData(const nsIFrame* aAnimatedGeometryRoot, bool aDisplayItemFixedToViewport); void AdjustLayerDataForFixedPositioning(const nsIFrame* aFixedPosFrame, const nsIntRegion& aDrawRegion, nsIntRegion* aVisibleRegion, bool* aIsSolidColorInVisibleRegion = nullptr); /** * Set fixed-pos layer metadata on aLayer according to the data for aFixedPosFrame. */ void SetFixedPositionLayerData(Layer* aLayer, const nsIFrame* aFixedPosFrame); /** * Returns true if aItem's opaque area (in aOpaque) covers the entire * scrollable area of its presshell. */ bool ItemCoversScrollableArea(nsDisplayItem* aItem, const nsRegion& aOpaque); /** * For each layer in mNewChildLayers, remove from its visible region the * opaque regions of the layers at higher z-index, but only if they have * the same animated geometry root and fixed-pos frame ancestor. * The opaque region for the child layers that share the same animated * geometry root as the container frame is returned in * *aOpaqueRegionForContainer. */ void ApplyOcclusionCulling(nsIntRegion* aOpaqueRegionForContainer); /** * Computes the snapped opaque area of aItem. Sets aList's opaque flag * if it covers the entire list bounds. Sets *aHideAllLayersBelow to true * this item covers the entire viewport so that all layers below are * permanently invisible. */ nsIntRegion ComputeOpaqueRect(nsDisplayItem* aItem, const nsIFrame* aAnimatedGeometryRoot, const nsIFrame* aFixedPosFrame, const DisplayItemClip& aClip, nsDisplayList* aList, bool* aHideAllLayersBelow); /** * Indicate that we are done adding items to the ThebesLayer at the top of * mThebesLayerDataStack. Set the final visible region and opaque-content * flag, and pop it off the stack. */ void PopThebesLayerData(); /** * Find the ThebesLayer to which we should assign the next display item. * We scan the ThebesLayerData stack to find the topmost ThebesLayer * that is compatible with the display item (i.e., has the same * active scrolled root), and that has no content from other layers above * it and intersecting the aVisibleRect. * Returns the layer, and also updates the ThebesLayerData. Will * push a new ThebesLayerData onto the stack if no suitable existing * layer is found. If we choose a ThebesLayer that's already on the * ThebesLayerData stack, later elements on the stack will be popped off. * @param aVisibleRect the area of the next display item that's visible * @param aAnimatedGeometryRoot the active scrolled root for the next * display item * @param aOpaqueRect if non-null, a region of the display item that is opaque * @param aSolidColor if non-null, indicates that every pixel in aVisibleRect * will be painted with aSolidColor by the item * @param aShouldFixToViewport if true, aAnimatedGeometryRoot is the viewport * and we will be adding fixed-pos metadata for this layer because the * display item returned true from ShouldFixToViewport. */ ThebesLayerData* FindThebesLayerFor(nsDisplayItem* aItem, const nsIntRect& aVisibleRect, const nsIFrame* aAnimatedGeometryRoot, const nsPoint& aTopLeft, bool aShouldFixToViewport); ThebesLayerData* GetTopThebesLayerData() { return mThebesLayerDataStack.IsEmpty() ? nullptr : mThebesLayerDataStack[mThebesLayerDataStack.Length() - 1].get(); } /* Build a mask layer to represent the clipping region. Will return null if * there is no clipping specified or a mask layer cannot be built. * Builds an ImageLayer for the appropriate backend; the mask is relative to * aLayer's visible region. * aLayer is the layer to be clipped. * aLayerVisibleRegion is the region that will be set as aLayer's visible region, * relative to the container reference frame * aRoundedRectClipCount is used when building mask layers for ThebesLayers, * SetupMaskLayer will build a mask layer for only the first * aRoundedRectClipCount rounded rects in aClip */ void SetupMaskLayer(Layer *aLayer, const DisplayItemClip& aClip, const nsIntRegion& aLayerVisibleRegion, uint32_t aRoundedRectClipCount = UINT32_MAX); bool ChooseAnimatedGeometryRoot(const nsDisplayList& aList, const nsIFrame **aAnimatedGeometryRoot); nsDisplayListBuilder* mBuilder; LayerManager* mManager; FrameLayerBuilder* mLayerBuilder; nsIFrame* mContainerFrame; nsIFrame* mContainerReferenceFrame; const nsIFrame* mContainerAnimatedGeometryRoot; const nsIFrame* mContainerFixedPosFrame; ContainerLayer* mContainerLayer; nsRect mContainerBounds; DebugOnly mAccumulatedChildBounds; ContainerLayerParameters mParameters; /** * The region of ThebesLayers that should be invalidated every time * we recycle one. */ nsIntRegion mInvalidThebesContent; nsAutoTArray,1> mThebesLayerDataStack; /** * We collect the list of children in here. During ProcessDisplayItems, * the layers in this array either have mContainerLayer as their parent, * or no parent. * ThebesLayers have two entries in this array: the second one is used only if * the ThebesLayer is optimized away to a ColorLayer or ImageLayer. * It's essential that this array is only appended to, since ThebesLayerData * records the index of its ThebesLayer in this array. */ typedef nsAutoTArray AutoLayersArray; AutoLayersArray mNewChildLayers; nsTArray > mRecycledThebesLayers; nsDataHashtable, nsRefPtr > mRecycledMaskImageLayers; uint32_t mNextFreeRecycledThebesLayer; nscoord mAppUnitsPerDevPixel; bool mSnappingEnabled; }; class ThebesDisplayItemLayerUserData : public LayerUserData { public: ThebesDisplayItemLayerUserData() : mMaskClipCount(0), mForcedBackgroundColor(NS_RGBA(0,0,0,0)), mXScale(1.f), mYScale(1.f), mAppUnitsPerDevPixel(0), mTranslation(0, 0), mAnimatedGeometryRootPosition(0, 0) {} /** * Record the number of clips in the Thebes layer's mask layer. * Should not be reset when the layer is recycled since it is used to track * changes in the use of mask layers. */ uint32_t mMaskClipCount; /** * A color that should be painted over the bounds of the layer's visible * region before any other content is painted. */ nscolor mForcedBackgroundColor; /** * The resolution scale used. */ float mXScale, mYScale; /** * The appunits per dev pixel for the items in this layer. */ nscoord mAppUnitsPerDevPixel; /** * The offset from the ThebesLayer's 0,0 to the * reference frame. This isn't necessarily the same as the transform * set on the ThebesLayer since we might also be applying an extra * offset specified by the parent ContainerLayer/ */ nsIntPoint mTranslation; /** * We try to make 0,0 of the ThebesLayer be the top-left of the * border-box of the "active scrolled root" frame (i.e. the nearest ancestor * frame for the display items that is being actively scrolled). But * we force the ThebesLayer transform to be an integer translation, and we may * have a resolution scale, so we have to snap the ThebesLayer transform, so * 0,0 may not be exactly the top-left of the active scrolled root. Here we * store the coordinates in ThebesLayer space of the top-left of the * active scrolled root. */ gfxPoint mAnimatedGeometryRootPosition; nsIntRegion mRegionToInvalidate; // The offset between the active scrolled root of this layer // and the root of the container for the previous and current // paints respectively. nsPoint mLastAnimatedGeometryRootOrigin; nsPoint mAnimatedGeometryRootOrigin; nsRefPtr mColorLayer; nsRefPtr mImageLayer; }; /* * User data for layers which will be used as masks. */ struct MaskLayerUserData : public LayerUserData { MaskLayerUserData() : mScaleX(-1.0f) , mScaleY(-1.0f) , mAppUnitsPerDevPixel(-1) { } bool operator== (const MaskLayerUserData& aOther) const { return mRoundedClipRects == aOther.mRoundedClipRects && mScaleX == aOther.mScaleX && mScaleY == aOther.mScaleY && mOffset == aOther.mOffset && mAppUnitsPerDevPixel == aOther.mAppUnitsPerDevPixel; } nsRefPtr mImageKey; // properties of the mask layer; the mask layer may be re-used if these // remain unchanged. nsTArray mRoundedClipRects; // scale from the masked layer which is applied to the mask float mScaleX, mScaleY; // The ContainerLayerParameters offset which is applied to the mask's transform. nsIntPoint mOffset; int32_t mAppUnitsPerDevPixel; }; /** * The address of gThebesDisplayItemLayerUserData is used as the user * data key for ThebesLayers created by FrameLayerBuilder. * It identifies ThebesLayers used to draw non-layer content, which are * therefore eligible for recycling. We want display items to be able to * create their own dedicated ThebesLayers in BuildLayer, if necessary, * and we wouldn't want to accidentally recycle those. * The user data is a ThebesDisplayItemLayerUserData. */ uint8_t gThebesDisplayItemLayerUserData; /** * The address of gColorLayerUserData is used as the user * data key for ColorLayers created by FrameLayerBuilder. * The user data is null. */ uint8_t gColorLayerUserData; /** * The address of gImageLayerUserData is used as the user * data key for ImageLayers created by FrameLayerBuilder. * The user data is null. */ uint8_t gImageLayerUserData; /** * The address of gLayerManagerUserData is used as the user * data key for retained LayerManagers managed by FrameLayerBuilder. * The user data is a LayerManagerData. */ uint8_t gLayerManagerUserData; /** * The address of gMaskLayerUserData is used as the user * data key for mask layers managed by FrameLayerBuilder. * The user data is a MaskLayerUserData. */ uint8_t gMaskLayerUserData; /** * Helper functions for getting user data and casting it to the correct type. * aLayer is the layer where the user data is stored. */ MaskLayerUserData* GetMaskLayerUserData(Layer* aLayer) { return static_cast(aLayer->GetUserData(&gMaskLayerUserData)); } ThebesDisplayItemLayerUserData* GetThebesDisplayItemLayerUserData(Layer* aLayer) { return static_cast( aLayer->GetUserData(&gThebesDisplayItemLayerUserData)); } /* static */ void FrameLayerBuilder::Shutdown() { if (gMaskLayerImageCache) { delete gMaskLayerImageCache; gMaskLayerImageCache = nullptr; } } void FrameLayerBuilder::Init(nsDisplayListBuilder* aBuilder, LayerManager* aManager, ThebesLayerData* aLayerData) { mDisplayListBuilder = aBuilder; mRootPresContext = aBuilder->RootReferenceFrame()->PresContext()->GetRootPresContext(); if (mRootPresContext) { mInitialDOMGeneration = mRootPresContext->GetDOMGeneration(); } mContainingThebesLayer = aLayerData; aManager->SetUserData(&gLayerManagerLayerBuilder, this); } void FrameLayerBuilder::FlashPaint(gfxContext *aContext) { float r = float(rand()) / RAND_MAX; float g = float(rand()) / RAND_MAX; float b = float(rand()) / RAND_MAX; aContext->SetColor(gfxRGBA(r, g, b, 0.4)); aContext->Paint(); } FrameLayerBuilder::DisplayItemData* FrameLayerBuilder::GetDisplayItemData(nsIFrame* aFrame, uint32_t aKey) { nsTArray *array = reinterpret_cast*>(aFrame->Properties().Get(LayerManagerDataProperty())); if (array) { for (uint32_t i = 0; i < array->Length(); i++) { DisplayItemData* item = array->ElementAt(i); if (item->mDisplayItemKey == aKey && item->mLayer->Manager() == mRetainingManager) { return item; } } } return nullptr; } nsACString& AppendToString(nsACString& s, const nsIntRect& r, const char* pfx="", const char* sfx="") { s += pfx; s += nsPrintfCString( "(x=%d, y=%d, w=%d, h=%d)", r.x, r.y, r.width, r.height); return s += sfx; } nsACString& AppendToString(nsACString& s, const nsIntRegion& r, const char* pfx="", const char* sfx="") { s += pfx; nsIntRegionRectIterator it(r); s += "< "; while (const nsIntRect* sr = it.Next()) { AppendToString(s, *sr) += "; "; } s += ">"; return s += sfx; } /** * Invalidate aRegion in aLayer. aLayer is in the coordinate system * *after* aTranslation has been applied, so we need to * apply the inverse of that transform before calling InvalidateRegion. */ static void InvalidatePostTransformRegion(ThebesLayer* aLayer, const nsIntRegion& aRegion, const nsIntPoint& aTranslation) { // Convert the region from the coordinates of the container layer // (relative to the snapped top-left of the display list reference frame) // to the ThebesLayer's own coordinates nsIntRegion rgn = aRegion; rgn.MoveBy(-aTranslation); aLayer->InvalidateRegion(rgn); #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { nsAutoCString str; AppendToString(str, rgn); printf_stderr("Invalidating layer %p: %s\n", aLayer, str.get()); } #endif } static void InvalidatePostTransformRegion(ThebesLayer* aLayer, const nsRect& aRect, const DisplayItemClip& aClip, const nsIntPoint& aTranslation) { ThebesDisplayItemLayerUserData* data = static_cast(aLayer->GetUserData(&gThebesDisplayItemLayerUserData)); nsRect rect = aClip.ApplyNonRoundedIntersection(aRect); nsIntRect pixelRect = rect.ScaleToOutsidePixels(data->mXScale, data->mYScale, data->mAppUnitsPerDevPixel); InvalidatePostTransformRegion(aLayer, pixelRect, aTranslation); } static nsIntPoint GetTranslationForThebesLayer(ThebesLayer* aLayer) { ThebesDisplayItemLayerUserData* data = static_cast (aLayer->GetUserData(&gThebesDisplayItemLayerUserData)); NS_ASSERTION(data, "Must be a tracked thebes layer!"); return data->mTranslation; } /** * Some frames can have multiple, nested, retaining layer managers * associated with them (normal manager, inactive managers, SVG effects). * In these cases we store the 'outermost' LayerManager data property * on the frame since we can walk down the chain from there. * * If one of these frames has just been destroyed, we will free the inner * layer manager when removing the entry from mFramesWithLayers. Destroying * the layer manager destroys the LayerManagerData and calls into * the DisplayItemData destructor. If the inner layer manager had any * items with the same frame, then we attempt to retrieve properties * from the deleted frame. * * Cache the destroyed frame pointer here so we can avoid crashing in this case. */ /* static */ void FrameLayerBuilder::RemoveFrameFromLayerManager(nsIFrame* aFrame, void* aPropertyValue) { sDestroyedFrame = aFrame; nsTArray *array = reinterpret_cast*>(aPropertyValue); // Hold a reference to all the items so that they don't get // deleted from under us. nsTArray > arrayCopy; for (uint32_t i = 0; i < array->Length(); ++i) { arrayCopy.AppendElement(array->ElementAt(i)); } #ifdef DEBUG_DISPLAY_ITEM_DATA if (array->Length()) { LayerManagerData *rootData = array->ElementAt(0)->mParent; while (rootData->mParent) { rootData = rootData->mParent; } printf_stderr("Removing frame %p - dumping display data\n", aFrame); rootData->Dump(); } #endif for (uint32_t i = 0; i < array->Length(); ++i) { DisplayItemData* data = array->ElementAt(i); ThebesLayer* t = data->mLayer->AsThebesLayer(); if (t) { ThebesDisplayItemLayerUserData* thebesData = static_cast(t->GetUserData(&gThebesDisplayItemLayerUserData)); if (thebesData) { nsRegion old = data->mGeometry->ComputeInvalidationRegion(); nsIntRegion rgn = old.ScaleToOutsidePixels(thebesData->mXScale, thebesData->mYScale, thebesData->mAppUnitsPerDevPixel); rgn.MoveBy(-GetTranslationForThebesLayer(t)); thebesData->mRegionToInvalidate.Or(thebesData->mRegionToInvalidate, rgn); thebesData->mRegionToInvalidate.SimplifyOutward(8); } } data->mParent->mDisplayItems.RemoveEntry(data); } arrayCopy.Clear(); delete array; sDestroyedFrame = nullptr; } void FrameLayerBuilder::DidBeginRetainedLayerTransaction(LayerManager* aManager) { mRetainingManager = aManager; LayerManagerData* data = static_cast (aManager->GetUserData(&gLayerManagerUserData)); if (data) { mInvalidateAllLayers = data->mInvalidateAllLayers; } else { data = new LayerManagerData(aManager); aManager->SetUserData(&gLayerManagerUserData, data); } } void FrameLayerBuilder::StoreOptimizedLayerForFrame(nsDisplayItem* aItem, Layer* aLayer) { if (!mRetainingManager) { return; } DisplayItemData* data = GetDisplayItemDataForManager(aItem, aLayer->Manager()); NS_ASSERTION(data, "Must have already stored data for this item!"); data->mOptLayer = aLayer; } void FrameLayerBuilder::DidEndTransaction() { GetMaskLayerImageCache()->Sweep(); } void FrameLayerBuilder::WillEndTransaction() { if (!mRetainingManager) { return; } // We need to save the data we'll need to support retaining. LayerManagerData* data = static_cast (mRetainingManager->GetUserData(&gLayerManagerUserData)); NS_ASSERTION(data, "Must have data!"); // Update all the frames that used to have layers. data->mDisplayItems.EnumerateEntries(ProcessRemovedDisplayItems, this); data->mInvalidateAllLayers = false; } /* static */ PLDHashOperator FrameLayerBuilder::ProcessRemovedDisplayItems(nsRefPtrHashKey* aEntry, void* aUserArg) { DisplayItemData* data = aEntry->GetKey(); FrameLayerBuilder* layerBuilder = static_cast(aUserArg); if (!data->mUsed) { // This item was visible, but isn't anymore. ThebesLayer* t = data->mLayer->AsThebesLayer(); if (t && data->mGeometry) { #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Invalidating unused display item (%i) belonging to frame %p from layer %p\n", data->mDisplayItemKey, data->mFrameList[0], t); } #endif InvalidatePostTransformRegion(t, data->mGeometry->ComputeInvalidationRegion(), data->mClip, layerBuilder->GetLastPaintOffset(t)); } return PL_DHASH_REMOVE; } else { layerBuilder->ComputeGeometryChangeForItem(data); } return PL_DHASH_NEXT; } /* static */ PLDHashOperator FrameLayerBuilder::DumpDisplayItemDataForFrame(nsRefPtrHashKey* aEntry, void* aClosure) { #ifdef DEBUG_DISPLAY_ITEM_DATA DisplayItemData *data = aEntry->GetKey(); nsAutoCString prefix; prefix += static_cast(aClosure); const char *layerState; switch (data->mLayerState) { case LAYER_NONE: layerState = "LAYER_NONE"; break; case LAYER_INACTIVE: layerState = "LAYER_INACTIVE"; break; case LAYER_ACTIVE: layerState = "LAYER_ACTIVE"; break; case LAYER_ACTIVE_FORCE: layerState = "LAYER_ACTIVE_FORCE"; break; case LAYER_ACTIVE_EMPTY: layerState = "LAYER_ACTIVE_EMPTY"; break; case LAYER_SVG_EFFECTS: layerState = "LAYER_SVG_EFFECTS"; break; } uint32_t mask = (1 << nsDisplayItem::TYPE_BITS) - 1; nsAutoCString str; str += prefix; str += nsPrintfCString("Frame %p ", data->mFrameList[0]); str += nsDisplayItem::DisplayItemTypeName(static_cast(data->mDisplayItemKey & mask)); if ((data->mDisplayItemKey >> nsDisplayItem::TYPE_BITS)) { str += nsPrintfCString("(%i)", data->mDisplayItemKey >> nsDisplayItem::TYPE_BITS); } str += nsPrintfCString(", %s, Layer %p", layerState, data->mLayer.get()); if (data->mOptLayer) { str += nsPrintfCString(", OptLayer %p", data->mOptLayer.get()); } if (data->mInactiveManager) { str += nsPrintfCString(", InactiveLayerManager %p", data->mInactiveManager.get()); } str += "\n"; printf_stderr("%s", str.get()); if (data->mInactiveManager) { prefix += " "; printf_stderr("%sDumping inactive layer info:\n", prefix.get()); LayerManagerData* lmd = static_cast (data->mInactiveManager->GetUserData(&gLayerManagerUserData)); lmd->Dump(prefix.get()); } #endif return PL_DHASH_NEXT; } /* static */ FrameLayerBuilder::DisplayItemData* FrameLayerBuilder::GetDisplayItemDataForManager(nsDisplayItem* aItem, LayerManager* aManager) { nsTArray *array = reinterpret_cast*>(aItem->Frame()->Properties().Get(LayerManagerDataProperty())); if (array) { for (uint32_t i = 0; i < array->Length(); i++) { DisplayItemData* item = array->ElementAt(i); if (item->mDisplayItemKey == aItem->GetPerFrameKey() && item->mLayer->Manager() == aManager) { return item; } } } return nullptr; } bool FrameLayerBuilder::HasRetainedDataFor(nsIFrame* aFrame, uint32_t aDisplayItemKey) { nsTArray *array = reinterpret_cast*>(aFrame->Properties().Get(LayerManagerDataProperty())); if (array) { for (uint32_t i = 0; i < array->Length(); i++) { if (array->ElementAt(i)->mDisplayItemKey == aDisplayItemKey) { return true; } } } return false; } void FrameLayerBuilder::IterateRetainedDataFor(nsIFrame* aFrame, DisplayItemDataCallback aCallback) { nsTArray *array = reinterpret_cast*>(aFrame->Properties().Get(LayerManagerDataProperty())); if (!array) { return; } for (uint32_t i = 0; i < array->Length(); i++) { DisplayItemData* data = array->ElementAt(i); if (data->mDisplayItemKey != nsDisplayItem::TYPE_ZERO) { aCallback(aFrame, data); } } } FrameLayerBuilder::DisplayItemData* FrameLayerBuilder::GetOldLayerForFrame(nsIFrame* aFrame, uint32_t aDisplayItemKey) { // If we need to build a new layer tree, then just refuse to recycle // anything. if (!mRetainingManager || mInvalidateAllLayers) return nullptr; DisplayItemData *data = GetDisplayItemData(aFrame, aDisplayItemKey); if (data && data->mLayer->Manager() == mRetainingManager) { return data; } return nullptr; } Layer* FrameLayerBuilder::GetOldLayerFor(nsDisplayItem* aItem, nsDisplayItemGeometry** aOldGeometry, DisplayItemClip** aOldClip) { uint32_t key = aItem->GetPerFrameKey(); nsIFrame* frame = aItem->Frame(); DisplayItemData* oldData = GetOldLayerForFrame(frame, key); if (oldData) { if (aOldGeometry) { *aOldGeometry = oldData->mGeometry.get(); } if (aOldClip) { *aOldClip = &oldData->mClip; } return oldData->mLayer; } return nullptr; } void FrameLayerBuilder::ClearCachedGeometry(nsDisplayItem* aItem) { uint32_t key = aItem->GetPerFrameKey(); nsIFrame* frame = aItem->Frame(); DisplayItemData* oldData = GetOldLayerForFrame(frame, key); if (oldData) { oldData->mGeometry = nullptr; } } /* static */ Layer* FrameLayerBuilder::GetDebugOldLayerFor(nsIFrame* aFrame, uint32_t aDisplayItemKey) { nsTArray *array = reinterpret_cast*>(aFrame->Properties().Get(LayerManagerDataProperty())); if (!array) { return nullptr; } for (uint32_t i = 0; i < array->Length(); i++) { DisplayItemData *data = array->ElementAt(i); if (data->mDisplayItemKey == aDisplayItemKey) { return data->mLayer; } } return nullptr; } already_AddRefed ContainerState::CreateOrRecycleColorLayer(ThebesLayer *aThebes) { ThebesDisplayItemLayerUserData* data = static_cast(aThebes->GetUserData(&gThebesDisplayItemLayerUserData)); nsRefPtr layer = data->mColorLayer; if (layer) { layer->SetMaskLayer(nullptr); } else { // Create a new layer layer = mManager->CreateColorLayer(); if (!layer) return nullptr; // Mark this layer as being used for Thebes-painting display items data->mColorLayer = layer; layer->SetUserData(&gColorLayerUserData, nullptr); // Remove other layer types we might have stored for this ThebesLayer data->mImageLayer = nullptr; } return layer.forget(); } already_AddRefed ContainerState::CreateOrRecycleImageLayer(ThebesLayer *aThebes) { ThebesDisplayItemLayerUserData* data = static_cast(aThebes->GetUserData(&gThebesDisplayItemLayerUserData)); nsRefPtr layer = data->mImageLayer; if (layer) { layer->SetMaskLayer(nullptr); } else { // Create a new layer layer = mManager->CreateImageLayer(); if (!layer) return nullptr; // Mark this layer as being used for Thebes-painting display items data->mImageLayer = layer; layer->SetUserData(&gImageLayerUserData, nullptr); // Remove other layer types we might have stored for this ThebesLayer data->mColorLayer = nullptr; } return layer.forget(); } already_AddRefed ContainerState::CreateOrRecycleMaskImageLayerFor(Layer* aLayer) { nsRefPtr result = mRecycledMaskImageLayers.Get(aLayer); if (result) { mRecycledMaskImageLayers.Remove(aLayer); // XXX if we use clip on mask layers, null it out here } else { // Create a new layer result = mManager->CreateImageLayer(); if (!result) return nullptr; result->SetUserData(&gMaskLayerUserData, new MaskLayerUserData()); result->SetDisallowBigImage(true); } return result.forget(); } static const double SUBPIXEL_OFFSET_EPSILON = 0.02; /** * This normally computes NSToIntRoundUp(aValue). However, if that would * give a residual near 0.5 while aOldResidual is near -0.5, or * it would give a residual near -0.5 while aOldResidual is near 0.5, then * instead we return the integer in the other direction so that the residual * is close to aOldResidual. */ static int32_t RoundToMatchResidual(double aValue, double aOldResidual) { int32_t v = NSToIntRoundUp(aValue); double residual = aValue - v; if (aOldResidual < 0) { if (residual > 0 && fabs(residual - 1.0 - aOldResidual) < SUBPIXEL_OFFSET_EPSILON) { // Round up instead return int32_t(ceil(aValue)); } } else if (aOldResidual > 0) { if (residual < 0 && fabs(residual + 1.0 - aOldResidual) < SUBPIXEL_OFFSET_EPSILON) { // Round down instead return int32_t(floor(aValue)); } } return v; } static void ResetScrollPositionForLayerPixelAlignment(const nsIFrame* aAnimatedGeometryRoot) { nsIScrollableFrame* sf = nsLayoutUtils::GetScrollableFrameFor(aAnimatedGeometryRoot); if (sf) { sf->ResetScrollPositionForLayerPixelAlignment(); } } static void InvalidateEntireThebesLayer(ThebesLayer* aLayer, const nsIFrame* aAnimatedGeometryRoot) { #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Invalidating entire layer %p\n", aLayer); } #endif nsIntRect invalidate = aLayer->GetValidRegion().GetBounds(); aLayer->InvalidateRegion(invalidate); aLayer->SetInvalidRectToVisibleRegion(); ResetScrollPositionForLayerPixelAlignment(aAnimatedGeometryRoot); } already_AddRefed ContainerState::CreateOrRecycleThebesLayer(const nsIFrame* aAnimatedGeometryRoot, const nsIFrame* aReferenceFrame, const nsPoint& aTopLeft) { // We need a new thebes layer nsRefPtr layer; ThebesDisplayItemLayerUserData* data; bool layerRecycled = false; #ifndef MOZ_ANDROID_OMTC bool didResetScrollPositionForLayerPixelAlignment = false; #endif // Check whether the layer will be scrollable. This is used as a hint to // influence whether tiled layers are used or not. LayerManager::ThebesLayerCreationHint creationHint = LayerManager::NONE; nsIFrame* animatedGeometryRootParent = aAnimatedGeometryRoot->GetParent(); if (animatedGeometryRootParent && animatedGeometryRootParent->GetType() == nsGkAtoms::scrollFrame) { creationHint = LayerManager::SCROLLABLE; } if (mNextFreeRecycledThebesLayer < mRecycledThebesLayers.Length()) { // Try to recycle a layer layer = mRecycledThebesLayers[mNextFreeRecycledThebesLayer]; ++mNextFreeRecycledThebesLayer; // Check if the layer hint has changed and whether or not the layer should // be recreated because of it. if (mManager->IsOptimizedFor(layer->AsThebesLayer(), creationHint)) { layerRecycled = true; // Clear clip rect and mask layer so we don't accidentally stay clipped. // We will reapply any necessary clipping. layer->SetMaskLayer(nullptr); data = static_cast (layer->GetUserData(&gThebesDisplayItemLayerUserData)); NS_ASSERTION(data, "Recycled ThebesLayers must have user data"); // This gets called on recycled ThebesLayers that are going to be in the // final layer tree, so it's a convenient time to invalidate the // content that changed where we don't know what ThebesLayer it belonged // to, or if we need to invalidate the entire layer, we can do that. // This needs to be done before we update the ThebesLayer to its new // transform. See nsGfxScrollFrame::InvalidateInternal, where // we ensure that mInvalidThebesContent is updated according to the // scroll position as of the most recent paint. if (!FuzzyEqual(data->mXScale, mParameters.mXScale, 0.00001f) || !FuzzyEqual(data->mYScale, mParameters.mYScale, 0.00001f) || data->mAppUnitsPerDevPixel != mAppUnitsPerDevPixel) { #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Recycled layer %p changed scale\n", layer.get()); } #endif InvalidateEntireThebesLayer(layer, aAnimatedGeometryRoot); #ifndef MOZ_ANDROID_OMTC didResetScrollPositionForLayerPixelAlignment = true; #endif } if (!data->mRegionToInvalidate.IsEmpty()) { #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Invalidating deleted frame content from layer %p\n", layer.get()); } #endif layer->InvalidateRegion(data->mRegionToInvalidate); #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { nsAutoCString str; AppendToString(str, data->mRegionToInvalidate); printf_stderr("Invalidating layer %p: %s\n", layer.get(), str.get()); } #endif data->mRegionToInvalidate.SetEmpty(); } // We do not need to Invalidate these areas in the widget because we // assume the caller of InvalidateThebesLayerContents has ensured // the area is invalidated in the widget. } } if (!layerRecycled) { // Create a new thebes layer layer = mManager->CreateThebesLayerWithHint(creationHint); if (!layer) return nullptr; // Mark this layer as being used for Thebes-painting display items data = new ThebesDisplayItemLayerUserData(); layer->SetUserData(&gThebesDisplayItemLayerUserData, data); ResetScrollPositionForLayerPixelAlignment(aAnimatedGeometryRoot); #ifndef MOZ_ANDROID_OMTC didResetScrollPositionForLayerPixelAlignment = true; #endif } data->mXScale = mParameters.mXScale; data->mYScale = mParameters.mYScale; data->mLastAnimatedGeometryRootOrigin = data->mAnimatedGeometryRootOrigin; data->mAnimatedGeometryRootOrigin = aTopLeft; data->mAppUnitsPerDevPixel = mAppUnitsPerDevPixel; layer->SetAllowResidualTranslation(mParameters.AllowResidualTranslation()); mLayerBuilder->SavePreviousDataForLayer(layer, data->mMaskClipCount); // Set up transform so that 0,0 in the Thebes layer corresponds to the // (pixel-snapped) top-left of the aAnimatedGeometryRoot. nsPoint offset = aAnimatedGeometryRoot->GetOffsetToCrossDoc(aReferenceFrame); nscoord appUnitsPerDevPixel = aAnimatedGeometryRoot->PresContext()->AppUnitsPerDevPixel(); gfxPoint scaledOffset( NSAppUnitsToDoublePixels(offset.x, appUnitsPerDevPixel)*mParameters.mXScale, NSAppUnitsToDoublePixels(offset.y, appUnitsPerDevPixel)*mParameters.mYScale); // We call RoundToMatchResidual here so that the residual after rounding // is close to data->mAnimatedGeometryRootPosition if possible. nsIntPoint pixOffset(RoundToMatchResidual(scaledOffset.x, data->mAnimatedGeometryRootPosition.x), RoundToMatchResidual(scaledOffset.y, data->mAnimatedGeometryRootPosition.y)); data->mTranslation = pixOffset; pixOffset += mParameters.mOffset; Matrix matrix; matrix.Translate(pixOffset.x, pixOffset.y); layer->SetBaseTransform(Matrix4x4::From2D(matrix)); // FIXME: Temporary workaround for bug 681192 and bug 724786. #ifndef MOZ_ANDROID_OMTC // Calculate exact position of the top-left of the active scrolled root. // This might not be 0,0 due to the snapping in ScaleToNearestPixels. gfxPoint animatedGeometryRootTopLeft = scaledOffset - ThebesPoint(matrix.GetTranslation()) + mParameters.mOffset; // If it has changed, then we need to invalidate the entire layer since the // pixels in the layer buffer have the content at a (subpixel) offset // from what we need. if (!animatedGeometryRootTopLeft.WithinEpsilonOf(data->mAnimatedGeometryRootPosition, SUBPIXEL_OFFSET_EPSILON)) { data->mAnimatedGeometryRootPosition = animatedGeometryRootTopLeft; InvalidateEntireThebesLayer(layer, aAnimatedGeometryRoot); } else if (didResetScrollPositionForLayerPixelAlignment) { data->mAnimatedGeometryRootPosition = animatedGeometryRootTopLeft; } #endif return layer.forget(); } #if defined(DEBUG) || defined(MOZ_DUMP_PAINTING) /** * Returns the appunits per dev pixel for the item's frame */ static int32_t AppUnitsPerDevPixel(nsDisplayItem* aItem) { // The underlying frame for zoom items is the root frame of the subdocument. // But zoom display items report their bounds etc using the parent document's // APD because zoom items act as a conversion layer between the two different // APDs. if (aItem->GetType() == nsDisplayItem::TYPE_ZOOM) { return static_cast(aItem)->GetParentAppUnitsPerDevPixel(); } return aItem->Frame()->PresContext()->AppUnitsPerDevPixel(); } #endif /** * Set the visible region for aLayer. * aOuterVisibleRegion is the visible region relative to the parent layer. * aLayerContentsVisibleRect, if non-null, is a rectangle in the layer's * own coordinate system to which the layer's visible region is restricted. * Consumes *aOuterVisibleRegion. */ static void SetOuterVisibleRegion(Layer* aLayer, nsIntRegion* aOuterVisibleRegion, const nsIntRect* aLayerContentsVisibleRect = nullptr) { gfx3DMatrix transform = To3DMatrix(aLayer->GetTransform()); gfxMatrix transform2D; if (transform.Is2D(&transform2D) && !transform2D.HasNonIntegerTranslation()) { aOuterVisibleRegion->MoveBy(-int(transform2D._31), -int(transform2D._32)); if (aLayerContentsVisibleRect) { aOuterVisibleRegion->And(*aOuterVisibleRegion, *aLayerContentsVisibleRect); } } else { nsIntRect outerRect = aOuterVisibleRegion->GetBounds(); // if 'transform' is not invertible, then nothing will be displayed // for the layer, so it doesn't really matter what we do here gfxRect outerVisible(outerRect.x, outerRect.y, outerRect.width, outerRect.height); gfxRect layerVisible = transform.Inverse().ProjectRectBounds(outerVisible); if (aLayerContentsVisibleRect) { NS_ASSERTION(aLayerContentsVisibleRect->width >= 0 && aLayerContentsVisibleRect->height >= 0, "Bad layer contents rectangle"); // restrict to aLayerContentsVisibleRect before call GfxRectToIntRect, // in case layerVisible is extremely large (as it can be when // projecting through the inverse of a 3D transform) gfxRect layerContentsVisible( aLayerContentsVisibleRect->x, aLayerContentsVisibleRect->y, aLayerContentsVisibleRect->width, aLayerContentsVisibleRect->height); layerVisible.IntersectRect(layerVisible, layerContentsVisible); } layerVisible.RoundOut(); nsIntRect visRect; if (gfxUtils::GfxRectToIntRect(layerVisible, &visRect)) { *aOuterVisibleRegion = visRect; } else { aOuterVisibleRegion->SetEmpty(); } } aLayer->SetVisibleRegion(*aOuterVisibleRegion); } void ContainerState::SetOuterVisibleRegionForLayer(Layer* aLayer, const nsIntRegion& aOuterVisibleRegion, const nsIntRect* aLayerContentsVisibleRect) const { nsIntRegion visRegion = aOuterVisibleRegion; visRegion.MoveBy(mParameters.mOffset); SetOuterVisibleRegion(aLayer, &visRegion, aLayerContentsVisibleRect); } nscolor ContainerState::FindOpaqueBackgroundColorFor(int32_t aThebesLayerIndex) { ThebesLayerData* target = mThebesLayerDataStack[aThebesLayerIndex]; for (int32_t i = aThebesLayerIndex - 1; i >= 0; --i) { ThebesLayerData* candidate = mThebesLayerDataStack[i]; if (candidate->IntersectsVisibleAboveRegion(target->mVisibleRegion)) { // Some non-Thebes content between target and candidate; this is // hopeless break; } nsIntRegion intersection; intersection.And(candidate->mVisibleRegion, target->mVisibleRegion); if (intersection.IsEmpty()) { // The layer doesn't intersect our target, ignore it and move on continue; } // The candidate intersects our target. If any layer has a solid-color // area behind our target, this must be it. Scan its display items. nsIntRect deviceRect = target->mVisibleRegion.GetBounds(); nsRect appUnitRect = deviceRect.ToAppUnits(mAppUnitsPerDevPixel); appUnitRect.ScaleInverseRoundOut(mParameters.mXScale, mParameters.mYScale); FrameLayerBuilder::ThebesLayerItemsEntry* entry = mLayerBuilder->GetThebesLayerItemsEntry(candidate->mLayer); NS_ASSERTION(entry, "Must know about this layer!"); for (int32_t j = entry->mItems.Length() - 1; j >= 0; --j) { nsDisplayItem* item = entry->mItems[j].mItem; bool snap; nsRect bounds = item->GetBounds(mBuilder, &snap); if (snap && mSnappingEnabled) { nsIntRect snappedBounds = ScaleToNearestPixels(bounds); if (!snappedBounds.Intersects(deviceRect)) continue; if (!snappedBounds.Contains(deviceRect)) break; } else { // The layer's visible rect is already (close enough to) pixel // aligned, so no need to round out and in here. if (!bounds.Intersects(appUnitRect)) continue; if (!bounds.Contains(appUnitRect)) break; } if (item->IsInvisibleInRect(appUnitRect)) { continue; } if (item->GetClip().IsRectAffectedByClip(deviceRect, mParameters.mXScale, mParameters.mYScale, mAppUnitsPerDevPixel)) { break; } nscolor color; if (item->IsUniform(mBuilder, &color) && NS_GET_A(color) == 255) return color; break; } break; } return NS_RGBA(0,0,0,0); } void ThebesLayerData::UpdateCommonClipCount( const DisplayItemClip& aCurrentClip) { if (!mLayer->Manager()->IsWidgetLayerManager()) { return; } if (mCommonClipCount >= 0) { mCommonClipCount = mItemClip.GetCommonRoundedRectCount(aCurrentClip, mCommonClipCount); } else { // first item in the layer mCommonClipCount = aCurrentClip.GetRoundedRectCount(); } } already_AddRefed ThebesLayerData::CanOptimizeImageLayer(nsDisplayListBuilder* aBuilder) { if (!mImage) { return nullptr; } return mImage->GetContainer(mLayer->Manager(), aBuilder); } const nsIFrame* ContainerState::FindFixedPosFrameForLayerData(const nsIFrame* aAnimatedGeometryRoot, bool aDisplayItemFixedToViewport) { if (!mManager->IsWidgetLayerManager()) { // Never attach any fixed-pos metadata to inactive layers, it's pointless! return nullptr; } nsPresContext* presContext = mContainerFrame->PresContext(); nsIFrame* viewport = presContext->PresShell()->GetRootFrame(); if (viewport == aAnimatedGeometryRoot && aDisplayItemFixedToViewport && nsLayoutUtils::ViewportHasDisplayPort(presContext)) { // Probably a background-attachment:fixed item return viewport; } // Viewports with no fixed-pos frames are not relevant. if (!viewport->GetFirstChild(nsIFrame::kFixedList)) { return nullptr; } for (const nsIFrame* f = aAnimatedGeometryRoot; f; f = f->GetParent()) { if (nsLayoutUtils::IsFixedPosFrameInDisplayPort(f)) { return f; } if (f == mContainerReferenceFrame) { // The metadata will go on an ancestor layer if necessary. return nullptr; } } return nullptr; } void ContainerState::AdjustLayerDataForFixedPositioning(const nsIFrame* aFixedPosFrame, const nsIntRegion& aDrawRegion, nsIntRegion* aVisibleRegion, bool* aIsSolidColorInVisibleRegion) { if (!aFixedPosFrame) { return; } nsRect fixedVisibleRect; nsPresContext* presContext = aFixedPosFrame->PresContext(); nsIPresShell* presShell = presContext->PresShell(); DebugOnly hasDisplayPort = nsLayoutUtils::ViewportHasDisplayPort(presContext, &fixedVisibleRect); NS_ASSERTION(hasDisplayPort, "No fixed-pos layer data if there's no displayport"); // Display ports are relative to the viewport, convert it to be relative // to our reference frame. nsIFrame* viewport = presShell->GetRootFrame(); if (aFixedPosFrame != viewport) { // position: fixed items are reflowed into and only drawn inside the // viewport, or the scroll position clamping scrollport size, if one is // set. We differentiate background-attachment: fixed items from // position: fixed items by the fact that background-attachment: fixed // items use the viewport as their aFixedPosFrame. NS_ASSERTION(aFixedPosFrame->StyleDisplay()->mPosition == NS_STYLE_POSITION_FIXED, "should be position fixed items only"); fixedVisibleRect.MoveTo(0, 0); if (presShell->IsScrollPositionClampingScrollPortSizeSet()) { fixedVisibleRect.SizeTo(presShell->GetScrollPositionClampingScrollPortSize()); } else { fixedVisibleRect.SizeTo(viewport->GetSize()); } } fixedVisibleRect += viewport->GetOffsetToCrossDoc(mContainerReferenceFrame); nsIntRegion newVisibleRegion; newVisibleRegion.And(ScaleToOutsidePixels(fixedVisibleRect, false), aDrawRegion); if (!aVisibleRegion->Contains(newVisibleRegion)) { if (aIsSolidColorInVisibleRegion) { *aIsSolidColorInVisibleRegion = false; } *aVisibleRegion = newVisibleRegion; } } void ContainerState::SetFixedPositionLayerData(Layer* aLayer, const nsIFrame* aFixedPosFrame) { aLayer->SetIsFixedPosition(aFixedPosFrame != nullptr); if (!aFixedPosFrame) { return; } nsPresContext* presContext = aFixedPosFrame->PresContext(); const nsIFrame* viewportFrame = aFixedPosFrame->GetParent(); // anchorRect will be in the container's coordinate system (aLayer's parent layer). // This is the same as the display items' reference frame. nsRect anchorRect; if (viewportFrame) { // Fixed position frames are reflowed into the scroll-port size if one has // been set. if (presContext->PresShell()->IsScrollPositionClampingScrollPortSizeSet()) { anchorRect.SizeTo(presContext->PresShell()->GetScrollPositionClampingScrollPortSize()); } else { anchorRect.SizeTo(viewportFrame->GetSize()); } } else { // A display item directly attached to the viewport. // For background-attachment:fixed items, the anchor point is always the // top-left of the viewport currently. viewportFrame = aFixedPosFrame; } // The anchorRect top-left is always the viewport top-left. anchorRect.MoveTo(viewportFrame->GetOffsetToCrossDoc(mContainerReferenceFrame)); nsLayoutUtils::SetFixedPositionLayerData(aLayer, viewportFrame, anchorRect, aFixedPosFrame, presContext, mParameters); } static bool CanOptimizeAwayThebesLayer(ThebesLayerData* aData, FrameLayerBuilder* aLayerBuilder) { if (!aLayerBuilder->IsBuildingRetainedLayers()) { return false; } // If there's no thebes layer with valid content in it that we can reuse, // always create a color or image layer (and potentially throw away an // existing completely invalid thebes layer). if (aData->mLayer->GetValidRegion().IsEmpty()) { return true; } // There is an existing thebes layer we can reuse. Throwing it away can make // compositing cheaper (see bug 946952), but it might cause us to re-allocate // the thebes layer frequently due to an animation. So we only discard it if // we're in tree compression mode, which is triggered at a low frequency. return aLayerBuilder->CheckInLayerTreeCompressionMode(); } #ifdef DEBUG static int32_t FindIndexOfLayerIn(nsTArray& aArray, Layer* aLayer) { for (uint32_t i = 0; i < aArray.Length(); ++i) { if (aArray[i].mLayer == aLayer) { return i; } } return -1; } #endif void ContainerState::PopThebesLayerData() { NS_ASSERTION(!mThebesLayerDataStack.IsEmpty(), "Can't pop"); int32_t lastIndex = mThebesLayerDataStack.Length() - 1; ThebesLayerData* data = mThebesLayerDataStack[lastIndex]; AdjustLayerDataForFixedPositioning(data->mFixedPosFrameForLayerData, data->mDrawRegion, &data->mVisibleRegion, &data->mIsSolidColorInVisibleRegion); NewLayerEntry* newLayerEntry = &mNewChildLayers[data->mNewChildLayersIndex]; nsRefPtr layer; nsRefPtr imageContainer = data->CanOptimizeImageLayer(mBuilder); if ((data->mIsSolidColorInVisibleRegion || imageContainer) && CanOptimizeAwayThebesLayer(data, mLayerBuilder)) { NS_ASSERTION(!(data->mIsSolidColorInVisibleRegion && imageContainer), "Can't be a solid color as well as an image!"); if (imageContainer) { nsRefPtr imageLayer = CreateOrRecycleImageLayer(data->mLayer); imageLayer->SetContainer(imageContainer); data->mImage->ConfigureLayer(imageLayer, mParameters.mOffset); imageLayer->SetPostScale(mParameters.mXScale, mParameters.mYScale); if (data->mItemClip.HasClip()) { nsIntRect clip = ScaleToNearestPixels(data->mItemClip.GetClipRect()); clip.MoveBy(mParameters.mOffset); imageLayer->SetClipRect(&clip); } else { imageLayer->SetClipRect(nullptr); } layer = imageLayer; mLayerBuilder->StoreOptimizedLayerForFrame(data->mImage, imageLayer); } else { nsRefPtr colorLayer = CreateOrRecycleColorLayer(data->mLayer); colorLayer->SetColor(data->mSolidColor); // Copy transform colorLayer->SetBaseTransform(data->mLayer->GetBaseTransform()); colorLayer->SetPostScale(data->mLayer->GetPostXScale(), data->mLayer->GetPostYScale()); nsIntRect visibleRect = data->mVisibleRegion.GetBounds(); visibleRect.MoveBy(-GetTranslationForThebesLayer(data->mLayer)); colorLayer->SetBounds(visibleRect); layer = colorLayer; } NS_ASSERTION(FindIndexOfLayerIn(mNewChildLayers, layer) < 0, "Layer already in list???"); NS_ASSERTION(newLayerEntry->mLayer == data->mLayer, "Thebes layer at wrong index"); // Store optimized layer in reserved slot newLayerEntry = &mNewChildLayers[data->mNewChildLayersIndex + 1]; NS_ASSERTION(!newLayerEntry->mLayer, "Slot already occupied?"); newLayerEntry->mLayer = layer; newLayerEntry->mAnimatedGeometryRoot = data->mAnimatedGeometryRoot; newLayerEntry->mFixedPosFrameForLayerData = data->mFixedPosFrameForLayerData; // Hide the ThebesLayer. We leave it in the layer tree so that we // can find and recycle it later. nsIntRect emptyRect; data->mLayer->SetClipRect(&emptyRect); data->mLayer->SetVisibleRegion(nsIntRegion()); data->mLayer->SetEventRegions(EventRegions()); } else { layer = data->mLayer; imageContainer = nullptr; layer->SetClipRect(nullptr); } if (mLayerBuilder->IsBuildingRetainedLayers()) { newLayerEntry->mVisibleRegion = data->mVisibleRegion; newLayerEntry->mOpaqueRegion = data->mOpaqueRegion; newLayerEntry->mHideAllLayersBelow = data->mHideAllLayersBelow; if (nsLayoutUtils::GetScrollableFrameFor(newLayerEntry->mAnimatedGeometryRoot) && !nsDisplayScrollLayer::IsConstructingScrollLayerForScrolledFrame(newLayerEntry->mAnimatedGeometryRoot)) { // Async scrolling not currently active so we can propagate our opaque region // up to the parent animated geometry root. newLayerEntry->mOpaqueForAnimatedGeometryRootParent = true; } } else { SetOuterVisibleRegionForLayer(layer, data->mVisibleRegion); } nsIntRegion transparentRegion; transparentRegion.Sub(data->mVisibleRegion, data->mOpaqueRegion); bool isOpaque = transparentRegion.IsEmpty(); // For translucent ThebesLayers, try to find an opaque background // color that covers the entire area beneath it so we can pull that // color into this layer to make it opaque. if (layer == data->mLayer) { nscolor backgroundColor = NS_RGBA(0,0,0,0); if (!isOpaque) { backgroundColor = FindOpaqueBackgroundColorFor(lastIndex); if (NS_GET_A(backgroundColor) == 255) { isOpaque = true; } } // Store the background color ThebesDisplayItemLayerUserData* userData = GetThebesDisplayItemLayerUserData(data->mLayer); NS_ASSERTION(userData, "where did our user data go?"); if (userData->mForcedBackgroundColor != backgroundColor) { // Invalidate the entire target ThebesLayer since we're changing // the background color #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Forced background color has changed from #%08X to #%08X on layer %p\n", userData->mForcedBackgroundColor, backgroundColor, data->mLayer); nsAutoCString str; AppendToString(str, data->mLayer->GetValidRegion()); printf_stderr("Invalidating layer %p: %s\n", data->mLayer, str.get()); } #endif data->mLayer->InvalidateRegion(data->mLayer->GetValidRegion()); } userData->mForcedBackgroundColor = backgroundColor; // use a mask layer for rounded rect clipping. // data->mCommonClipCount may be -1 if we haven't put any actual // drawable items in this layer (i.e. it's only catching events). int32_t commonClipCount = std::max(0, data->mCommonClipCount); SetupMaskLayer(layer, data->mItemClip, data->mVisibleRegion, commonClipCount); // copy commonClipCount to the entry FrameLayerBuilder::ThebesLayerItemsEntry* entry = mLayerBuilder-> GetThebesLayerItemsEntry(static_cast(layer.get())); entry->mCommonClipCount = commonClipCount; } else { // mask layer for image and color layers SetupMaskLayer(layer, data->mItemClip, data->mVisibleRegion); } uint32_t flags = 0; nsIWidget* widget = mContainerReferenceFrame->PresContext()->GetRootWidget(); // See bug 941095. Not quite ready to disable this. bool hidpi = false && widget && widget->GetDefaultScale().scale >= 2; if (hidpi) { flags |= Layer::CONTENT_DISABLE_SUBPIXEL_AA; } if (isOpaque && !data->mForceTransparentSurface) { flags |= Layer::CONTENT_OPAQUE; } else if (data->mNeedComponentAlpha && !hidpi) { flags |= Layer::CONTENT_COMPONENT_ALPHA; } layer->SetContentFlags(flags); SetFixedPositionLayerData(layer, data->mFixedPosFrameForLayerData); ThebesLayerData* containingThebesLayerData = mLayerBuilder->GetContainingThebesLayerData(); if (containingThebesLayerData) { if (!data->mDispatchToContentHitRegion.GetBounds().IsEmpty()) { nsRect rect = nsLayoutUtils::TransformFrameRectToAncestor( mContainerReferenceFrame, data->mDispatchToContentHitRegion.GetBounds(), containingThebesLayerData->mReferenceFrame); containingThebesLayerData->mDispatchToContentHitRegion.Or( containingThebesLayerData->mDispatchToContentHitRegion, rect); } if (!data->mMaybeHitRegion.GetBounds().IsEmpty()) { nsRect rect = nsLayoutUtils::TransformFrameRectToAncestor( mContainerReferenceFrame, data->mMaybeHitRegion.GetBounds(), containingThebesLayerData->mReferenceFrame); containingThebesLayerData->mMaybeHitRegion.Or( containingThebesLayerData->mMaybeHitRegion, rect); } if (!data->mHitRegion.GetBounds().IsEmpty()) { // Our definitely-hit region must go to the maybe-hit-region since // this function is an approximation. gfx3DMatrix matrix = nsLayoutUtils::GetTransformToAncestor( mContainerReferenceFrame, containingThebesLayerData->mReferenceFrame); gfxMatrix matrix2D; bool isPrecise = matrix.Is2D(&matrix2D) && !matrix2D.HasNonAxisAlignedTransform(); nsRect rect = nsLayoutUtils::TransformFrameRectToAncestor( mContainerReferenceFrame, data->mHitRegion.GetBounds(), containingThebesLayerData->mReferenceFrame); nsRegion* dest = isPrecise ? &containingThebesLayerData->mHitRegion : &containingThebesLayerData->mMaybeHitRegion; dest->Or(*dest, rect); } } else { EventRegions regions; regions.mHitRegion = ScaleRegionToOutsidePixels(data->mHitRegion); // Points whose hit-region status we're not sure about need to be dispatched // to the content thread. nsIntRegion maybeHitRegion = ScaleRegionToOutsidePixels(data->mMaybeHitRegion); regions.mDispatchToContentHitRegion.Sub(maybeHitRegion, regions.mHitRegion); regions.mDispatchToContentHitRegion.Or(regions.mDispatchToContentHitRegion, ScaleRegionToOutsidePixels(data->mDispatchToContentHitRegion)); nsIntPoint translation = -GetTranslationForThebesLayer(data->mLayer); regions.mHitRegion.MoveBy(translation); regions.mDispatchToContentHitRegion.MoveBy(translation); layer->SetEventRegions(regions); } if (lastIndex > 0) { // Since we're going to pop off the last ThebesLayerData, the // mVisibleAboveRegion of the second-to-last item will need to include // the regions of the last item. ThebesLayerData* nextData = mThebesLayerDataStack[lastIndex - 1]; nextData->CopyAboveRegion(data); } mThebesLayerDataStack.RemoveElementAt(lastIndex); } static bool IsItemAreaInWindowOpaqueRegion(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem, const nsRect& aComponentAlphaBounds) { if (!aItem->Frame()->PresContext()->IsChrome()) { // Assume that Web content is always in the window opaque region. return true; } if (aItem->ReferenceFrame() != aBuilder->RootReferenceFrame()) { // aItem is probably in some transformed subtree. // We're not going to bother figuring out where this landed, we're just // going to assume it might have landed over a transparent part of // the window. return false; } return aBuilder->GetWindowOpaqueRegion().Contains(aComponentAlphaBounds); } void ThebesLayerData::Accumulate(ContainerState* aState, nsDisplayItem* aItem, const nsIntRegion& aClippedOpaqueRegion, const nsIntRect& aVisibleRect, const nsIntRect& aDrawRect, const DisplayItemClip& aClip) { if (aState->mBuilder->NeedToForceTransparentSurfaceForItem(aItem)) { mForceTransparentSurface = true; } if (aState->mParameters.mDisableSubpixelAntialiasingInDescendants) { // Disable component alpha. // Note that the transform (if any) on the ThebesLayer is always an integer translation so // we don't have to factor that in here. aItem->DisableComponentAlpha(); } /* Mark as available for conversion to image layer if this is a nsDisplayImage and * we are the first visible item in the ThebesLayerData object. */ if (mVisibleRegion.IsEmpty() && aItem->SupportsOptimizingToImage()) { mImage = static_cast(aItem); } else { mImage = nullptr; } bool clipMatches = mItemClip == aClip; mItemClip = aClip; if (!mIsSolidColorInVisibleRegion && mOpaqueRegion.Contains(aDrawRect) && mVisibleRegion.Contains(aVisibleRect)) { // A very common case! Most pages have a ThebesLayer with the page // background (opaque) visible and most or all of the page content over the // top of that background. // The rest of this method won't do anything. mVisibleRegion, mOpaqueRegion // and mDrawRegion don't need updating. mVisibleRegion contains aVisibleRect // already, mOpaqueRegion contains aDrawRect and therefore whatever // the opaque region of the item is. mDrawRegion must contain mOpaqueRegion // and therefore aDrawRect. NS_ASSERTION(mDrawRegion.Contains(aDrawRect), "Draw region not covered"); return; } nscolor uniformColor; bool isUniform = aItem->IsUniform(aState->mBuilder, &uniformColor); // Some display items have to exist (so they can set forceTransparentSurface // below) but don't draw anything. They'll return true for isUniform but // a color with opacity 0. if (!isUniform || NS_GET_A(uniformColor) > 0) { // Make sure that the visible area is covered by uniform pixels. In // particular this excludes cases where the edges of the item are not // pixel-aligned (thus the item will not be truly uniform). if (isUniform) { bool snap; nsRect bounds = aItem->GetBounds(aState->mBuilder, &snap); if (!aState->ScaleToInsidePixels(bounds, snap).Contains(aVisibleRect)) { isUniform = false; } } if (isUniform) { if (mVisibleRegion.IsEmpty()) { // This color is all we have mSolidColor = uniformColor; mIsSolidColorInVisibleRegion = true; } else if (mIsSolidColorInVisibleRegion && mVisibleRegion.IsEqual(nsIntRegion(aVisibleRect)) && clipMatches) { // we can just blend the colors together mSolidColor = NS_ComposeColors(mSolidColor, uniformColor); } else { mIsSolidColorInVisibleRegion = false; } } else { mIsSolidColorInVisibleRegion = false; } mVisibleRegion.Or(mVisibleRegion, aVisibleRect); mVisibleRegion.SimplifyOutward(4); mDrawRegion.Or(mDrawRegion, aDrawRect); mDrawRegion.SimplifyOutward(4); } if (!aClippedOpaqueRegion.IsEmpty()) { nsIntRegionRectIterator iter(aClippedOpaqueRegion); for (const nsIntRect* r = iter.Next(); r; r = iter.Next()) { // We don't use SimplifyInward here since it's not defined exactly // what it will discard. For our purposes the most important case // is a large opaque background at the bottom of z-order (e.g., // a canvas background), so we need to make sure that the first rect // we see doesn't get discarded. nsIntRegion tmp; tmp.Or(mOpaqueRegion, *r); // Opaque display items in chrome documents whose window is partially // transparent are always added to the opaque region. This helps ensure // that we get as much subpixel-AA as possible in the chrome. if (tmp.GetNumRects() <= 4 || aItem->Frame()->PresContext()->IsChrome()) { mOpaqueRegion = tmp; } } } if (!aState->mParameters.mDisableSubpixelAntialiasingInDescendants) { nsRect componentAlpha = aItem->GetComponentAlphaBounds(aState->mBuilder); if (!componentAlpha.IsEmpty()) { nsIntRect componentAlphaRect = aState->ScaleToOutsidePixels(componentAlpha, false).Intersect(aVisibleRect); if (!mOpaqueRegion.Contains(componentAlphaRect)) { if (IsItemAreaInWindowOpaqueRegion(aState->mBuilder, aItem, componentAlpha.Intersect(aItem->GetVisibleRect()))) { mNeedComponentAlpha = true; } else { aItem->DisableComponentAlpha(); } } } } } ThebesLayerData* ContainerState::FindThebesLayerFor(nsDisplayItem* aItem, const nsIntRect& aVisibleRect, const nsIFrame* aAnimatedGeometryRoot, const nsPoint& aTopLeft, bool aShouldFixToViewport) { int32_t i; int32_t lowestUsableLayerWithScrolledRoot = -1; int32_t topmostLayerWithScrolledRoot = -1; for (i = mThebesLayerDataStack.Length() - 1; i >= 0; --i) { // Don't let should-fix-to-viewport items share a layer with any other items. if (aShouldFixToViewport) { ++i; break; } ThebesLayerData* data = mThebesLayerDataStack[i]; // Give up if there is content drawn above (in z-order) this layer that // intersects aItem's visible region; aItem must be placed in a // layer above this layer. if (data->DrawAboveRegionIntersects(aVisibleRect)) { ++i; break; } // If the animated scrolled roots are the same and we can share this layer // with the item, note this as a usable layer. if (data->mAnimatedGeometryRoot == aAnimatedGeometryRoot && !data->mSingleItemFixedToViewport) { lowestUsableLayerWithScrolledRoot = i; if (topmostLayerWithScrolledRoot < 0) { topmostLayerWithScrolledRoot = i; } } // If the layer's drawn region intersects the item, stop now since no // lower layer will be usable. Do the same if the layer is subject to // async transforms, since we don't know where it will really be drawn. if (data->DrawRegionIntersects(aVisibleRect)) break; } if (topmostLayerWithScrolledRoot < 0) { --i; for (; i >= 0; --i) { ThebesLayerData* data = mThebesLayerDataStack[i]; if (data->mAnimatedGeometryRoot == aAnimatedGeometryRoot) { topmostLayerWithScrolledRoot = i; break; } } } if (topmostLayerWithScrolledRoot >= 0) { while (uint32_t(topmostLayerWithScrolledRoot + 1) < mThebesLayerDataStack.Length()) { PopThebesLayerData(); } } ThebesLayerData* thebesLayerData = nullptr; if (lowestUsableLayerWithScrolledRoot < 0) { nsRefPtr layer = CreateOrRecycleThebesLayer(aAnimatedGeometryRoot, aItem->ReferenceFrame(), aTopLeft); thebesLayerData = new ThebesLayerData(); mThebesLayerDataStack.AppendElement(thebesLayerData); thebesLayerData->mLayer = layer; thebesLayerData->mAnimatedGeometryRoot = aAnimatedGeometryRoot; thebesLayerData->mFixedPosFrameForLayerData = FindFixedPosFrameForLayerData(aAnimatedGeometryRoot, aShouldFixToViewport); thebesLayerData->mReferenceFrame = aItem->ReferenceFrame(); thebesLayerData->mSingleItemFixedToViewport = aShouldFixToViewport; NS_ASSERTION(FindIndexOfLayerIn(mNewChildLayers, layer) < 0, "Layer already in list???"); thebesLayerData->mNewChildLayersIndex = mNewChildLayers.Length(); NewLayerEntry* newLayerEntry = mNewChildLayers.AppendElement(); newLayerEntry->mLayer = layer.forget(); newLayerEntry->mAnimatedGeometryRoot = aAnimatedGeometryRoot; newLayerEntry->mFixedPosFrameForLayerData = thebesLayerData->mFixedPosFrameForLayerData; // newLayerEntry->mOpaqueRegion is filled in later from // thebesLayerData->mOpaqueRegion, if necessary. // Allocate another entry for this layer's optimization to ColorLayer/ImageLayer mNewChildLayers.AppendElement(); } else { thebesLayerData = mThebesLayerDataStack[lowestUsableLayerWithScrolledRoot]; } return thebesLayerData; } #ifdef MOZ_DUMP_PAINTING static void DumpPaintedImage(nsDisplayItem* aItem, SourceSurface* aSurface) { nsCString string(aItem->Name()); string.Append('-'); string.AppendInt((uint64_t)aItem); fprintf_stderr(gfxUtils::sDumpPaintFile, "array[\"%s\"]=\"", string.BeginReading()); gfxUtils::DumpAsDataURI(aSurface, gfxUtils::sDumpPaintFile); fprintf_stderr(gfxUtils::sDumpPaintFile, "\";"); } #endif static void PaintInactiveLayer(nsDisplayListBuilder* aBuilder, LayerManager* aManager, nsDisplayItem* aItem, gfxContext* aContext, nsRenderingContext* aCtx) { // This item has an inactive layer. Render it to a ThebesLayer // using a temporary BasicLayerManager. BasicLayerManager* basic = static_cast(aManager); nsRefPtr context = aContext; #ifdef MOZ_DUMP_PAINTING int32_t appUnitsPerDevPixel = AppUnitsPerDevPixel(aItem); nsIntRect itemVisibleRect = aItem->GetVisibleRect().ToOutsidePixels(appUnitsPerDevPixel); RefPtr tempDT; if (gfxUtils::sDumpPainting) { tempDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget( itemVisibleRect.Size().ToIntSize(), SurfaceFormat::B8G8R8A8); context = new gfxContext(tempDT); context->SetMatrix(gfxMatrix().Translate(-gfxPoint(itemVisibleRect.x, itemVisibleRect.y))); } #endif basic->BeginTransaction(); basic->SetTarget(context); if (aItem->GetType() == nsDisplayItem::TYPE_SVG_EFFECTS) { static_cast(aItem)->PaintAsLayer(aBuilder, aCtx, basic); if (basic->InTransaction()) { basic->AbortTransaction(); } } else { basic->EndTransaction(FrameLayerBuilder::DrawThebesLayer, aBuilder); } FrameLayerBuilder *builder = static_cast(basic->GetUserData(&gLayerManagerLayerBuilder)); if (builder) { builder->DidEndTransaction(); } basic->SetTarget(nullptr); #ifdef MOZ_DUMP_PAINTING if (gfxUtils::sDumpPainting) { RefPtr surface = tempDT->Snapshot(); DumpPaintedImage(aItem, surface); DrawTarget* drawTarget = aContext->GetDrawTarget(); Rect rect(itemVisibleRect.x, itemVisibleRect.y, itemVisibleRect.width, itemVisibleRect.height); drawTarget->DrawSurface(surface, rect, Rect(Point(0,0), rect.Size())); aItem->SetPainted(); } #endif } /** * Chooses a single active scrolled root for the entire display list, used * when we are flattening layers. */ bool ContainerState::ChooseAnimatedGeometryRoot(const nsDisplayList& aList, const nsIFrame **aAnimatedGeometryRoot) { for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) { LayerState layerState = item->GetLayerState(mBuilder, mManager, mParameters); // Don't use an item that won't be part of any ThebesLayers to pick the // active scrolled root. if (layerState == LAYER_ACTIVE_FORCE) { continue; } // Try using the actual active scrolled root of the backmost item, as that // should result in the least invalidation when scrolling. *aAnimatedGeometryRoot = nsLayoutUtils::GetAnimatedGeometryRootFor(item, mBuilder, mManager); return true; } return false; } /* Checks if aPotentialScrollItem is a scroll layer item and aPotentialScrollbarItem * is an overlay scrollbar item for the same scroll frame. */ static bool IsScrollLayerItemAndOverlayScrollbarForScrollFrame( nsDisplayItem* aPotentialScrollItem, nsDisplayItem* aPotentialScrollbarItem) { if (aPotentialScrollItem->GetType() == nsDisplayItem::TYPE_SCROLL_LAYER && aPotentialScrollbarItem && aPotentialScrollbarItem->GetType() == nsDisplayItem::TYPE_OWN_LAYER && LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars)) { nsDisplayScrollLayer* scrollItem = static_cast(aPotentialScrollItem); nsDisplayOwnLayer* layerItem = static_cast(aPotentialScrollbarItem); if ((layerItem->GetFlags() & (nsDisplayOwnLayer::VERTICAL_SCROLLBAR | nsDisplayOwnLayer::HORIZONTAL_SCROLLBAR)) && layerItem->Frame()->GetParent() == scrollItem->GetScrollFrame()) { return true; } } return false; } bool ContainerState::ItemCoversScrollableArea(nsDisplayItem* aItem, const nsRegion& aOpaque) { nsIPresShell* presShell = aItem->Frame()->PresContext()->PresShell(); nsIFrame* rootFrame = presShell->GetRootFrame(); if (mContainerFrame != rootFrame) { return false; } nsRect scrollableArea; if (presShell->IsScrollPositionClampingScrollPortSizeSet()) { scrollableArea = nsRect(nsPoint(0, 0), presShell->GetScrollPositionClampingScrollPortSize()); } else { scrollableArea = rootFrame->GetRectRelativeToSelf(); } return aOpaque.Contains(scrollableArea); } nsIntRegion ContainerState::ComputeOpaqueRect(nsDisplayItem* aItem, const nsIFrame* aAnimatedGeometryRoot, const nsIFrame* aFixedPosFrame, const DisplayItemClip& aClip, nsDisplayList* aList, bool* aHideAllLayersBelow) { bool snapOpaque; nsRegion opaque = aItem->GetOpaqueRegion(mBuilder, &snapOpaque); nsIntRegion opaquePixels; if (!opaque.IsEmpty()) { nsRegion opaqueClipped; nsRegionRectIterator iter(opaque); for (const nsRect* r = iter.Next(); r; r = iter.Next()) { opaqueClipped.Or(opaqueClipped, aClip.ApproximateIntersectInward(*r)); } if (aAnimatedGeometryRoot == mContainerAnimatedGeometryRoot && aFixedPosFrame == mContainerFixedPosFrame && !aList->IsOpaque() && opaqueClipped.Contains(mContainerBounds)) { aList->SetIsOpaque(); } // Add opaque areas to the "exclude glass" region. Only do this when our // container layer is going to be the rootmost layer, otherwise transforms // etc will mess us up (and opaque contributions from other containers are // not needed). if (!nsLayoutUtils::GetCrossDocParentFrame(mContainerFrame)) { mBuilder->AddWindowOpaqueRegion(opaqueClipped); } opaquePixels = ScaleRegionToInsidePixels(opaqueClipped, snapOpaque); if (aFixedPosFrame && ItemCoversScrollableArea(aItem, opaque)) { *aHideAllLayersBelow = true; } } return opaquePixels; } /* * Iterate through the non-clip items in aList and its descendants. * For each item we compute the effective clip rect. Each item is assigned * to a layer. We invalidate the areas in ThebesLayers where an item * has moved from one ThebesLayer to another. Also, * aState->mInvalidThebesContent is invalidated in every ThebesLayer. * We set the clip rect for items that generated their own layer, and * create a mask layer to do any rounded rect clipping. * (ThebesLayers don't need a clip rect on the layer, we clip the items * individually when we draw them.) * We set the visible rect for all layers, although the actual setting * of visible rects for some ThebesLayers is deferred until the calling * of ContainerState::Finish. */ void ContainerState::ProcessDisplayItems(nsDisplayList* aList, uint32_t aFlags) { PROFILER_LABEL("ContainerState", "ProcessDisplayItems", js::ProfileEntry::Category::GRAPHICS); const nsIFrame* lastAnimatedGeometryRoot = mContainerReferenceFrame; nsPoint topLeft(0,0); // When NO_COMPONENT_ALPHA is set, items will be flattened into a single // layer, so we need to choose which active scrolled root to use for all // items. if (aFlags & NO_COMPONENT_ALPHA) { if (ChooseAnimatedGeometryRoot(*aList, &lastAnimatedGeometryRoot)) { topLeft = lastAnimatedGeometryRoot->GetOffsetToCrossDoc(mContainerReferenceFrame); } } int32_t maxLayers = nsDisplayItem::MaxActiveLayers(); int layerCount = 0; nsDisplayList savedItems; nsDisplayItem* item; while ((item = aList->RemoveBottom()) != nullptr) { // Peek ahead to the next item and try merging with it or swapping with it // if necessary. nsDisplayItem* aboveItem; while ((aboveItem = aList->GetBottom()) != nullptr) { if (aboveItem->TryMerge(mBuilder, item)) { aList->RemoveBottom(); item->~nsDisplayItem(); item = aboveItem; } else if (IsScrollLayerItemAndOverlayScrollbarForScrollFrame(aboveItem, item)) { // If an overlay scrollbar item is between a scroll layer item and the // other scroll layer items that we need to merge with just move the // scrollbar item up, that way it will be on top of the scrolled content // and we can try to merge all the scroll layer items. aList->RemoveBottom(); aList->AppendToBottom(item); item = aboveItem; } else { break; } } nsDisplayList* itemSameCoordinateSystemChildren = item->GetSameCoordinateSystemChildren(); if (item->ShouldFlattenAway(mBuilder)) { aList->AppendToBottom(itemSameCoordinateSystemChildren); item->~nsDisplayItem(); continue; } savedItems.AppendToTop(item); NS_ASSERTION(mAppUnitsPerDevPixel == AppUnitsPerDevPixel(item), "items in a container layer should all have the same app units per dev pixel"); nsIntRect itemVisibleRect = ScaleToOutsidePixels(item->GetVisibleRect(), false); bool snap; nsRect itemContent = item->GetBounds(mBuilder, &snap); nsIntRect itemDrawRect = ScaleToOutsidePixels(itemContent, snap); nsDisplayItem::Type itemType = item->GetType(); bool prerenderedTransform = itemType == nsDisplayItem::TYPE_TRANSFORM && static_cast(item)->ShouldPrerender(); nsIntRect clipRect; const DisplayItemClip& itemClip = item->GetClip(); if (itemClip.HasClip()) { itemContent.IntersectRect(itemContent, itemClip.GetClipRect()); clipRect = ScaleToNearestPixels(itemClip.GetClipRect()); if (!prerenderedTransform) { itemDrawRect.IntersectRect(itemDrawRect, clipRect); } clipRect.MoveBy(mParameters.mOffset); } #ifdef DEBUG ((nsRect&)mAccumulatedChildBounds).UnionRect(mAccumulatedChildBounds, itemContent); #endif itemVisibleRect.IntersectRect(itemVisibleRect, itemDrawRect); LayerState layerState = item->GetLayerState(mBuilder, mManager, mParameters); if (layerState == LAYER_INACTIVE && nsDisplayItem::ForceActiveLayers()) { layerState = LAYER_ACTIVE; } bool forceInactive; const nsIFrame* animatedGeometryRoot; if (aFlags & NO_COMPONENT_ALPHA) { forceInactive = true; animatedGeometryRoot = lastAnimatedGeometryRoot; } else { forceInactive = false; if (mManager->IsWidgetLayerManager()) { animatedGeometryRoot = nsLayoutUtils::GetAnimatedGeometryRootFor(item, mBuilder, mManager); } else { // For inactive layer subtrees, splitting content into ThebesLayers // based on animated geometry roots is pointless. It's more efficient // to build the minimum number of layers. animatedGeometryRoot = mContainerAnimatedGeometryRoot; } if (animatedGeometryRoot != lastAnimatedGeometryRoot) { lastAnimatedGeometryRoot = animatedGeometryRoot; topLeft = animatedGeometryRoot->GetOffsetToCrossDoc(mContainerReferenceFrame); } } bool shouldFixToViewport = !animatedGeometryRoot->GetParent() && item->ShouldFixToViewport(mManager); if (maxLayers != -1 && layerCount >= maxLayers) { forceInactive = true; } // Assign the item to a layer if (layerState == LAYER_ACTIVE_FORCE || (layerState == LAYER_INACTIVE && !mManager->IsWidgetLayerManager()) || (!forceInactive && (layerState == LAYER_ACTIVE_EMPTY || layerState == LAYER_ACTIVE))) { layerCount++; // LAYER_ACTIVE_EMPTY means the layer is created just for its metadata. // We should never see an empty layer with any visible content! NS_ASSERTION(layerState != LAYER_ACTIVE_EMPTY || itemVisibleRect.IsEmpty(), "State is LAYER_ACTIVE_EMPTY but visible rect is not."); // As long as the new layer isn't going to be a ThebesLayer, // InvalidateForLayerChange doesn't need the new layer pointer. // We also need to check the old data now, because BuildLayer // can overwrite it. InvalidateForLayerChange(item, nullptr); // If the item would have its own layer but is invisible, just hide it. // Note that items without their own layers can't be skipped this // way, since their ThebesLayer may decide it wants to draw them // into its buffer even if they're currently covered. if (itemVisibleRect.IsEmpty() && !item->ShouldBuildLayerEvenIfInvisible(mBuilder)) { continue; } // Just use its layer. // Set layerContentsVisibleRect.width/height to -1 to indicate we // currently don't know. If BuildContainerLayerFor gets called by // item->BuildLayer, this will be set to a proper rect. nsIntRect layerContentsVisibleRect(0, 0, -1, -1); mParameters.mLayerContentsVisibleRect = &layerContentsVisibleRect; nsRefPtr ownLayer = item->BuildLayer(mBuilder, mManager, mParameters); if (!ownLayer) { continue; } NS_ASSERTION(!ownLayer->AsThebesLayer(), "Should never have created a dedicated Thebes layer!"); const nsIFrame* fixedPosFrame = FindFixedPosFrameForLayerData(animatedGeometryRoot, shouldFixToViewport); if (fixedPosFrame) { nsIntRegion visibleRegion(itemVisibleRect); AdjustLayerDataForFixedPositioning(fixedPosFrame, nsIntRegion(itemDrawRect), &visibleRegion); itemVisibleRect = visibleRegion.GetBounds(); } SetFixedPositionLayerData(ownLayer, fixedPosFrame); nsRect invalid; if (item->IsInvalid(invalid)) { ownLayer->SetInvalidRectToVisibleRegion(); } // If it's not a ContainerLayer, we need to apply the scale transform // ourselves. if (!ownLayer->AsContainerLayer()) { ownLayer->SetPostScale(mParameters.mXScale, mParameters.mYScale); } // Update that layer's clip and visible rects. NS_ASSERTION(ownLayer->Manager() == mManager, "Wrong manager"); NS_ASSERTION(!ownLayer->HasUserData(&gLayerManagerUserData), "We shouldn't have a FrameLayerBuilder-managed layer here!"); NS_ASSERTION(itemClip.HasClip() || itemClip.GetRoundedRectCount() == 0, "If we have rounded rects, we must have a clip rect"); // It has its own layer. Update that layer's clip and visible rects. if (itemClip.HasClip()) { ownLayer->SetClipRect(&clipRect); } else { ownLayer->SetClipRect(nullptr); } ThebesLayerData* data = GetTopThebesLayerData(); if (data) { // Prerendered transform items can be updated without layer building // (async animations or an empty transaction), so we need to put items // that the transform item can potentially move under into a layer // above this item. if (prerenderedTransform) { if (!itemClip.HasClip()) { // The transform item can move anywhere, treat all other content // as being above this item. data->SetAllDrawingAbove(); } else { // The transform can't escape from the clip rect, and the clip // rect can't change without new layer building. Treat all content // that intersects the clip rect as being above this item. data->AddVisibleAboveRegion(clipRect); data->AddDrawAboveRegion(clipRect); } } else { data->AddVisibleAboveRegion(itemVisibleRect); // Add the entire bounds rect to the mDrawAboveRegion. // The visible region may be excluding opaque content above the // item, and we need to ensure that that content is not placed // in a ThebesLayer below the item! data->AddDrawAboveRegion(itemDrawRect); } } // rounded rectangle clipping using mask layers // (must be done after visible rect is set on layer) if (itemClip.IsRectClippedByRoundedCorner(itemContent)) { SetupMaskLayer(ownLayer, itemClip, itemVisibleRect); } ContainerLayer* oldContainer = ownLayer->GetParent(); if (oldContainer && oldContainer != mContainerLayer) { oldContainer->RemoveChild(ownLayer); } NS_ASSERTION(FindIndexOfLayerIn(mNewChildLayers, ownLayer) < 0, "Layer already in list???"); NewLayerEntry* newLayerEntry = mNewChildLayers.AppendElement(); newLayerEntry->mLayer = ownLayer; newLayerEntry->mAnimatedGeometryRoot = animatedGeometryRoot; newLayerEntry->mFixedPosFrameForLayerData = fixedPosFrame; // Don't attempt to flatten compnent alpha layers that are within // a forced active layer, or an active transform; if (itemType == nsDisplayItem::TYPE_TRANSFORM || layerState == LAYER_ACTIVE_FORCE) { newLayerEntry->mPropagateComponentAlphaFlattening = false; } // nsDisplayTransform::BuildLayer must set layerContentsVisibleRect. // We rely on this to ensure 3D transforms compute a reasonable // layer visible region. NS_ASSERTION(itemType != nsDisplayItem::TYPE_TRANSFORM || layerContentsVisibleRect.width >= 0, "Transform items must set layerContentsVisibleRect!"); if (mLayerBuilder->IsBuildingRetainedLayers()) { newLayerEntry->mLayerContentsVisibleRect = layerContentsVisibleRect; newLayerEntry->mVisibleRegion = itemVisibleRect; newLayerEntry->mOpaqueRegion = ComputeOpaqueRect(item, animatedGeometryRoot, fixedPosFrame, itemClip, aList, &newLayerEntry->mHideAllLayersBelow); } else { SetOuterVisibleRegionForLayer(ownLayer, itemVisibleRect, layerContentsVisibleRect.width >= 0 ? &layerContentsVisibleRect : nullptr); } if (itemType == nsDisplayItem::TYPE_SCROLL_LAYER) { nsDisplayScrollLayer* scrollItem = static_cast(item); newLayerEntry->mOpaqueForAnimatedGeometryRootParent = scrollItem->IsDisplayPortOpaque(); } /** * No need to allocate geometry for items that aren't * part of a ThebesLayer. */ mLayerBuilder->AddLayerDisplayItem(ownLayer, item, layerState, topLeft, nullptr); } else { ThebesLayerData* thebesLayerData = FindThebesLayerFor(item, itemVisibleRect, animatedGeometryRoot, topLeft, shouldFixToViewport); if (itemType == nsDisplayItem::TYPE_LAYER_EVENT_REGIONS) { nsDisplayLayerEventRegions* eventRegions = static_cast(item); thebesLayerData->AccumulateEventRegions(eventRegions->HitRegion(), eventRegions->MaybeHitRegion(), eventRegions->DispatchToContentHitRegion()); } else { // check to see if the new item has rounded rect clips in common with // other items in the layer thebesLayerData->UpdateCommonClipCount(itemClip); InvalidateForLayerChange(item, thebesLayerData->mLayer); mLayerBuilder->AddThebesDisplayItem(thebesLayerData, item, itemClip, itemVisibleRect, *this, layerState, topLeft); nsIntRegion opaquePixels = ComputeOpaqueRect(item, animatedGeometryRoot, thebesLayerData->mFixedPosFrameForLayerData, itemClip, aList, &thebesLayerData->mHideAllLayersBelow); thebesLayerData->Accumulate(this, item, opaquePixels, itemVisibleRect, itemDrawRect, itemClip); } } if (itemSameCoordinateSystemChildren && itemSameCoordinateSystemChildren->NeedsTransparentSurface()) { aList->SetNeedsTransparentSurface(); } } aList->AppendToTop(&savedItems); } void ContainerState::InvalidateForLayerChange(nsDisplayItem* aItem, ThebesLayer* aNewLayer) { NS_ASSERTION(aItem->GetPerFrameKey(), "Display items that render using Thebes must have a key"); nsDisplayItemGeometry* oldGeometry = nullptr; DisplayItemClip* oldClip = nullptr; Layer* oldLayer = mLayerBuilder->GetOldLayerFor(aItem, &oldGeometry, &oldClip); if (aNewLayer != oldLayer && oldLayer) { // The item has changed layers. // Invalidate the old bounds in the old layer and new bounds in the new layer. ThebesLayer* t = oldLayer->AsThebesLayer(); if (t && oldGeometry) { // Note that whenever the layer's scale changes, we invalidate the whole thing, // so it doesn't matter whether we are using the old scale at last paint // or a new scale here #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Display item type %s(%p) changed layers %p to %p!\n", aItem->Name(), aItem->Frame(), t, aNewLayer); } #endif InvalidatePostTransformRegion(t, oldGeometry->ComputeInvalidationRegion(), *oldClip, mLayerBuilder->GetLastPaintOffset(t)); } // Clear the old geometry so that invalidation thinks the item has been // added this paint. mLayerBuilder->ClearCachedGeometry(aItem); aItem->NotifyRenderingChanged(); } } void FrameLayerBuilder::ComputeGeometryChangeForItem(DisplayItemData* aData) { nsDisplayItem *item = aData->mItem; ThebesLayer* thebesLayer = aData->mLayer->AsThebesLayer(); if (!item || !thebesLayer) { aData->EndUpdate(); return; } ThebesLayerItemsEntry* entry = mThebesLayerItems.GetEntry(thebesLayer); nsAutoPtr geometry(item->AllocateGeometry(mDisplayListBuilder)); ThebesDisplayItemLayerUserData* layerData = static_cast(aData->mLayer->GetUserData(&gThebesDisplayItemLayerUserData)); nsPoint shift = layerData->mAnimatedGeometryRootOrigin - layerData->mLastAnimatedGeometryRootOrigin; const DisplayItemClip& clip = item->GetClip(); // If the frame is marked as invalidated, and didn't specify a rect to invalidate then we want to // invalidate both the old and new bounds, otherwise we only want to invalidate the changed areas. // If we do get an invalid rect, then we want to add this on top of the change areas. nsRect invalid; nsRegion combined; bool notifyRenderingChanged = true; if (!aData->mGeometry) { // This item is being added for the first time, invalidate its entire area. //TODO: We call GetGeometry again in AddThebesDisplayItem, we should reuse this. combined = clip.ApplyNonRoundedIntersection(geometry->ComputeInvalidationRegion()); #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Display item type %s(%p) added to layer %p!\n", item->Name(), item->Frame(), aData->mLayer.get()); } #endif } else if (aData->mIsInvalid || (item->IsInvalid(invalid) && invalid.IsEmpty())) { // Either layout marked item as needing repainting, invalidate the entire old and new areas. combined = aData->mClip.ApplyNonRoundedIntersection(aData->mGeometry->ComputeInvalidationRegion()); combined.MoveBy(shift); combined.Or(combined, clip.ApplyNonRoundedIntersection(geometry->ComputeInvalidationRegion())); #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Display item type %s(%p) (in layer %p) belongs to an invalidated frame!\n", item->Name(), item->Frame(), aData->mLayer.get()); } #endif } else { // Let the display item check for geometry changes and decide what needs to be // repainted. const nsTArray& changedFrames = aData->GetFrameListChanges(); // We have an optimization to cache the drawing background-attachment: fixed canvas // background images so we can scroll and just blit them when they are flattened into // the same layer as scrolling content. NotifyRenderingChanged is only used to tell // the canvas bg image item to purge this cache. We want to be careful not to accidentally // purge the cache if we are just invalidating due to scrolling (ie the background image // moves on the scrolling layer but it's rendering stays the same) so if // AddOffsetAndComputeDifference is the only thing that will invalidate we skip the // NotifyRenderingChanged call (ComputeInvalidationRegion for background images also calls // NotifyRenderingChanged if anything changes). if (aData->mGeometry->ComputeInvalidationRegion() == geometry->ComputeInvalidationRegion() && aData->mClip == clip && invalid.IsEmpty() && changedFrames.Length() == 0) { notifyRenderingChanged = false; } aData->mGeometry->MoveBy(shift); item->ComputeInvalidationRegion(mDisplayListBuilder, aData->mGeometry, &combined); aData->mClip.AddOffsetAndComputeDifference(entry->mCommonClipCount, shift, aData->mGeometry->ComputeInvalidationRegion(), clip, entry->mLastCommonClipCount, geometry->ComputeInvalidationRegion(), &combined); // Add in any rect that the frame specified combined.Or(combined, invalid); for (uint32_t i = 0; i < changedFrames.Length(); i++) { combined.Or(combined, changedFrames[i]->GetVisualOverflowRect()); } // Restrict invalidation to the clipped region nsRegion clipRegion; if (clip.ComputeRegionInClips(&aData->mClip, shift, &clipRegion)) { combined.And(combined, clipRegion); } #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { if (!combined.IsEmpty()) { printf_stderr("Display item type %s(%p) (in layer %p) changed geometry!\n", item->Name(), item->Frame(), aData->mLayer.get()); } } #endif } if (!combined.IsEmpty()) { if (notifyRenderingChanged) { item->NotifyRenderingChanged(); } InvalidatePostTransformRegion(thebesLayer, combined.ScaleToOutsidePixels(layerData->mXScale, layerData->mYScale, layerData->mAppUnitsPerDevPixel), layerData->mTranslation); } aData->EndUpdate(geometry); } void FrameLayerBuilder::AddThebesDisplayItem(ThebesLayerData* aLayerData, nsDisplayItem* aItem, const DisplayItemClip& aClip, const nsIntRect& aItemVisibleRect, const ContainerState& aContainerState, LayerState aLayerState, const nsPoint& aTopLeft) { ThebesLayer* layer = aLayerData->mLayer; ThebesDisplayItemLayerUserData* thebesData = static_cast (layer->GetUserData(&gThebesDisplayItemLayerUserData)); nsRefPtr tempManager; nsIntRect intClip; bool hasClip = false; if (aLayerState != LAYER_NONE) { DisplayItemData *data = GetDisplayItemDataForManager(aItem, layer->Manager()); if (data) { tempManager = data->mInactiveManager; } if (!tempManager) { tempManager = new BasicLayerManager(BasicLayerManager::BLM_INACTIVE); } // We need to grab these before calling AddLayerDisplayItem because it will overwrite them. nsRegion clip; DisplayItemClip* oldClip = nullptr; GetOldLayerFor(aItem, nullptr, &oldClip); hasClip = aClip.ComputeRegionInClips(oldClip, aTopLeft - thebesData->mLastAnimatedGeometryRootOrigin, &clip); if (hasClip) { intClip = clip.GetBounds().ScaleToOutsidePixels(thebesData->mXScale, thebesData->mYScale, thebesData->mAppUnitsPerDevPixel); } } AddLayerDisplayItem(layer, aItem, aLayerState, aTopLeft, tempManager); ThebesLayerItemsEntry* entry = mThebesLayerItems.PutEntry(layer); if (entry) { entry->mContainerLayerFrame = aContainerState.GetContainerFrame(); if (entry->mContainerLayerGeneration == 0) { entry->mContainerLayerGeneration = mContainerLayerGeneration; } if (tempManager) { FrameLayerBuilder* layerBuilder = new FrameLayerBuilder(); layerBuilder->Init(mDisplayListBuilder, tempManager, aLayerData); tempManager->BeginTransaction(); if (mRetainingManager) { layerBuilder->DidBeginRetainedLayerTransaction(tempManager); } nsAutoPtr props(LayerProperties::CloneFrom(tempManager->GetRoot())); nsRefPtr tmpLayer = aItem->BuildLayer(mDisplayListBuilder, tempManager, ContainerLayerParameters()); // We have no easy way of detecting if this transaction will ever actually get finished. // For now, I've just silenced the warning with nested transactions in BasicLayers.cpp if (!tmpLayer) { tempManager->EndTransaction(nullptr, nullptr); tempManager->SetUserData(&gLayerManagerLayerBuilder, nullptr); return; } bool snap; nsRect visibleRect = aItem->GetVisibleRect().Intersect(aItem->GetBounds(mDisplayListBuilder, &snap)); nsIntRegion rgn = visibleRect.ToOutsidePixels(thebesData->mAppUnitsPerDevPixel); SetOuterVisibleRegion(tmpLayer, &rgn); // If BuildLayer didn't call BuildContainerLayerFor, then our new layer won't have been // stored in layerBuilder. Manually add it now. if (mRetainingManager) { #ifdef DEBUG_DISPLAY_ITEM_DATA LayerManagerData* parentLmd = static_cast (layer->Manager()->GetUserData(&gLayerManagerUserData)); LayerManagerData* lmd = static_cast (tempManager->GetUserData(&gLayerManagerUserData)); lmd->mParent = parentLmd; #endif layerBuilder->StoreDataForFrame(aItem, tmpLayer, LAYER_ACTIVE); } tempManager->SetRoot(tmpLayer); layerBuilder->WillEndTransaction(); tempManager->AbortTransaction(); nsIntPoint offset = GetLastPaintOffset(layer) - GetTranslationForThebesLayer(layer); props->MoveBy(-offset); nsIntRegion invalid = props->ComputeDifferences(tmpLayer, nullptr); if (aLayerState == LAYER_SVG_EFFECTS) { invalid = nsSVGIntegrationUtils::AdjustInvalidAreaForSVGEffects(aItem->Frame(), aItem->ToReferenceFrame(), invalid); } if (!invalid.IsEmpty()) { #ifdef MOZ_DUMP_PAINTING if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) { printf_stderr("Inactive LayerManager(%p) for display item %s(%p) has an invalid region - invalidating layer %p\n", tempManager.get(), aItem->Name(), aItem->Frame(), layer); } #endif invalid.ScaleRoundOut(thebesData->mXScale, thebesData->mYScale); if (hasClip) { invalid.And(invalid, intClip); } InvalidatePostTransformRegion(layer, invalid, GetTranslationForThebesLayer(layer)); } } ClippedDisplayItem* cdi = entry->mItems.AppendElement(ClippedDisplayItem(aItem, mContainerLayerGeneration)); cdi->mInactiveLayerManager = tempManager; } } FrameLayerBuilder::DisplayItemData* FrameLayerBuilder::StoreDataForFrame(nsDisplayItem* aItem, Layer* aLayer, LayerState aState) { DisplayItemData* oldData = GetDisplayItemDataForManager(aItem, mRetainingManager); if (oldData) { if (!oldData->mUsed) { oldData->BeginUpdate(aLayer, aState, mContainerLayerGeneration, aItem); } return oldData; } LayerManagerData* lmd = static_cast (mRetainingManager->GetUserData(&gLayerManagerUserData)); nsRefPtr data = new DisplayItemData(lmd, aItem->GetPerFrameKey()); data->BeginUpdate(aLayer, aState, mContainerLayerGeneration, aItem); lmd->mDisplayItems.PutEntry(data); return data; } void FrameLayerBuilder::StoreDataForFrame(nsIFrame* aFrame, uint32_t aDisplayItemKey, Layer* aLayer, LayerState aState) { DisplayItemData* oldData = GetDisplayItemData(aFrame, aDisplayItemKey); if (oldData && oldData->mFrameList.Length() == 1) { oldData->BeginUpdate(aLayer, aState, mContainerLayerGeneration); return; } LayerManagerData* lmd = static_cast (mRetainingManager->GetUserData(&gLayerManagerUserData)); nsRefPtr data = new DisplayItemData(lmd, aDisplayItemKey, aFrame); data->BeginUpdate(aLayer, aState, mContainerLayerGeneration); lmd->mDisplayItems.PutEntry(data); } FrameLayerBuilder::ClippedDisplayItem::~ClippedDisplayItem() { if (mInactiveLayerManager) { BasicLayerManager* basic = static_cast(mInactiveLayerManager.get()); basic->SetUserData(&gLayerManagerLayerBuilder, nullptr); } } void FrameLayerBuilder::AddLayerDisplayItem(Layer* aLayer, nsDisplayItem* aItem, LayerState aLayerState, const nsPoint& aTopLeft, BasicLayerManager* aManager) { if (aLayer->Manager() != mRetainingManager) return; DisplayItemData *data = StoreDataForFrame(aItem, aLayer, aLayerState); data->mInactiveManager = aManager; } nsIntPoint FrameLayerBuilder::GetLastPaintOffset(ThebesLayer* aLayer) { ThebesLayerItemsEntry* entry = mThebesLayerItems.PutEntry(aLayer); if (entry) { if (entry->mContainerLayerGeneration == 0) { entry->mContainerLayerGeneration = mContainerLayerGeneration; } if (entry->mHasExplicitLastPaintOffset) return entry->mLastPaintOffset; } return GetTranslationForThebesLayer(aLayer); } void FrameLayerBuilder::SavePreviousDataForLayer(ThebesLayer* aLayer, uint32_t aClipCount) { ThebesLayerItemsEntry* entry = mThebesLayerItems.PutEntry(aLayer); if (entry) { if (entry->mContainerLayerGeneration == 0) { entry->mContainerLayerGeneration = mContainerLayerGeneration; } entry->mLastPaintOffset = GetTranslationForThebesLayer(aLayer); entry->mHasExplicitLastPaintOffset = true; entry->mLastCommonClipCount = aClipCount; } } bool FrameLayerBuilder::CheckInLayerTreeCompressionMode() { if (mInLayerTreeCompressionMode) { return true; } // If we wanted to be in layer tree compression mode, but weren't, then scheduled // a delayed repaint where we will be. mRootPresContext->PresShell()->GetRootFrame()->SchedulePaint(nsIFrame::PAINT_DELAYED_COMPRESS); return false; } void ContainerState::CollectOldLayers() { for (Layer* layer = mContainerLayer->GetFirstChild(); layer; layer = layer->GetNextSibling()) { NS_ASSERTION(!layer->HasUserData(&gMaskLayerUserData), "Mask layer in layer tree; could not be recycled."); if (layer->HasUserData(&gThebesDisplayItemLayerUserData)) { NS_ASSERTION(layer->AsThebesLayer(), "Wrong layer type"); mRecycledThebesLayers.AppendElement(static_cast(layer)); } if (Layer* maskLayer = layer->GetMaskLayer()) { NS_ASSERTION(maskLayer->GetType() == Layer::TYPE_IMAGE, "Could not recycle mask layer, unsupported layer type."); mRecycledMaskImageLayers.Put(layer, static_cast(maskLayer)); } } } struct OpaqueRegionEntry { const nsIFrame* mAnimatedGeometryRoot; const nsIFrame* mFixedPosFrameForLayerData; nsIntRegion mOpaqueRegion; }; static OpaqueRegionEntry* FindOpaqueRegionEntry(nsTArray& aEntries, const nsIFrame* aAnimatedGeometryRoot, const nsIFrame* aFixedPosFrameForLayerData) { for (uint32_t i = 0; i < aEntries.Length(); ++i) { OpaqueRegionEntry* d = &aEntries[i]; if (d->mAnimatedGeometryRoot == aAnimatedGeometryRoot && d->mFixedPosFrameForLayerData == aFixedPosFrameForLayerData) { return d; } } return nullptr; } void ContainerState::ApplyOcclusionCulling(nsIntRegion* aOpaqueRegionForContainer) { nsAutoTArray opaqueRegions; bool hideAll = false; int32_t opaqueRegionForContainer = -1; for (int32_t i = mNewChildLayers.Length() - 1; i >= 0; --i) { NewLayerEntry* e = &mNewChildLayers.ElementAt(i); if (!e->mLayer) { continue; } OpaqueRegionEntry* data = FindOpaqueRegionEntry(opaqueRegions, e->mAnimatedGeometryRoot, e->mFixedPosFrameForLayerData); if (hideAll) { e->mVisibleRegion.SetEmpty(); } else if (data) { e->mVisibleRegion.Sub(e->mVisibleRegion, data->mOpaqueRegion); } if (!e->mOpaqueRegion.IsEmpty()) { const nsIFrame* animatedGeometryRootToCover = e->mAnimatedGeometryRoot; if (e->mOpaqueForAnimatedGeometryRootParent && nsLayoutUtils::GetAnimatedGeometryRootForFrame(e->mAnimatedGeometryRoot->GetParent(), mContainerAnimatedGeometryRoot) == mContainerAnimatedGeometryRoot) { animatedGeometryRootToCover = mContainerAnimatedGeometryRoot; data = FindOpaqueRegionEntry(opaqueRegions, animatedGeometryRootToCover, e->mFixedPosFrameForLayerData); } if (!data) { if (animatedGeometryRootToCover == mContainerAnimatedGeometryRoot && !e->mFixedPosFrameForLayerData) { NS_ASSERTION(opaqueRegionForContainer == -1, "Already found it?"); opaqueRegionForContainer = opaqueRegions.Length(); } data = opaqueRegions.AppendElement(); data->mAnimatedGeometryRoot = animatedGeometryRootToCover; data->mFixedPosFrameForLayerData = e->mFixedPosFrameForLayerData; } data->mOpaqueRegion.Or(data->mOpaqueRegion, e->mOpaqueRegion); if (e->mHideAllLayersBelow) { hideAll = true; } } SetOuterVisibleRegionForLayer(e->mLayer, e->mVisibleRegion, e->mLayerContentsVisibleRect.width >= 0 ? &e->mLayerContentsVisibleRect : nullptr); if (e->mLayer->GetType() == Layer::TYPE_READBACK) { // ReadbackLayers need to accurately read what's behind them. So, // we don't want to do any occlusion culling of layers behind them. // Theoretically we could just punch out the ReadbackLayer's rectangle // from all mOpaqueRegions, but that's probably not worth doing. opaqueRegions.Clear(); opaqueRegionForContainer = -1; } } if (opaqueRegionForContainer >= 0) { aOpaqueRegionForContainer->Or(*aOpaqueRegionForContainer, opaqueRegions[opaqueRegionForContainer].mOpaqueRegion); } } void ContainerState::Finish(uint32_t* aTextContentFlags, LayerManagerData* aData, const nsIntRect& aContainerPixelBounds, nsDisplayList* aChildItems, bool& aHasComponentAlphaChildren) { while (!mThebesLayerDataStack.IsEmpty()) { PopThebesLayerData(); } NS_ASSERTION(mContainerBounds.IsEqualInterior(mAccumulatedChildBounds), "Bounds computation mismatch"); if (mLayerBuilder->IsBuildingRetainedLayers()) { nsIntRegion containerOpaqueRegion; ApplyOcclusionCulling(&containerOpaqueRegion); if (containerOpaqueRegion.Contains(aContainerPixelBounds)) { aChildItems->SetIsOpaque(); } } uint32_t textContentFlags = 0; // Make sure that current/existing layers are added to the parent and are // in the correct order. Layer* layer = nullptr; Layer* prevChild = nullptr; for (uint32_t i = 0; i < mNewChildLayers.Length(); ++i, prevChild = layer) { if (!mNewChildLayers[i].mLayer) { continue; } layer = mNewChildLayers[i].mLayer; if (!layer->GetVisibleRegion().IsEmpty()) { textContentFlags |= layer->GetContentFlags() & (Layer::CONTENT_COMPONENT_ALPHA | Layer::CONTENT_COMPONENT_ALPHA_DESCENDANT); // Notify the parent of component alpha children unless it's coming from // within a child that has asked not to contribute to layer flattening. if (mNewChildLayers[i].mPropagateComponentAlphaFlattening && (layer->GetContentFlags() & Layer::CONTENT_COMPONENT_ALPHA)) { aHasComponentAlphaChildren = true; } } if (!layer->GetParent()) { // This is not currently a child of the container, so just add it // now. mContainerLayer->InsertAfter(layer, prevChild); continue; } NS_ASSERTION(layer->GetParent() == mContainerLayer, "Layer shouldn't be the child of some other container"); if (layer->GetPrevSibling() != prevChild) { mContainerLayer->RepositionChild(layer, prevChild); } } // Remove old layers that have become unused. if (!layer) { layer = mContainerLayer->GetFirstChild(); } else { layer = layer->GetNextSibling(); } while (layer) { Layer *layerToRemove = layer; layer = layer->GetNextSibling(); mContainerLayer->RemoveChild(layerToRemove); } *aTextContentFlags = textContentFlags; } static inline gfxSize RoundToFloatPrecision(const gfxSize& aSize) { return gfxSize(float(aSize.width), float(aSize.height)); } static void RestrictScaleToMaxLayerSize(gfxSize& aScale, const nsRect& aVisibleRect, nsIFrame* aContainerFrame, Layer* aContainerLayer) { if (!aContainerLayer->Manager()->IsWidgetLayerManager()) { return; } nsIntRect pixelSize = aVisibleRect.ScaleToOutsidePixels(aScale.width, aScale.height, aContainerFrame->PresContext()->AppUnitsPerDevPixel()); int32_t maxLayerSize = aContainerLayer->GetMaxLayerSize(); if (pixelSize.width > maxLayerSize) { float scale = (float)pixelSize.width / maxLayerSize; scale = gfxUtils::ClampToScaleFactor(scale); aScale.width /= scale; } if (pixelSize.height > maxLayerSize) { float scale = (float)pixelSize.height / maxLayerSize; scale = gfxUtils::ClampToScaleFactor(scale); aScale.height /= scale; } } static bool ChooseScaleAndSetTransform(FrameLayerBuilder* aLayerBuilder, nsDisplayListBuilder* aDisplayListBuilder, nsIFrame* aContainerFrame, const nsRect& aVisibleRect, const Matrix4x4* aTransform, const ContainerLayerParameters& aIncomingScale, ContainerLayer* aLayer, LayerState aState, ContainerLayerParameters& aOutgoingScale) { nsIntPoint offset; Matrix4x4 transform = Matrix4x4().Scale(aIncomingScale.mXScale, aIncomingScale.mYScale, 1.0); if (aTransform) { // aTransform is applied first, then the scale is applied to the result transform = (*aTransform)*transform; // Set any matrix entries close to integers to be those exact integers. // This protects against floating-point inaccuracies causing problems // in the checks below. // We use the fixed epsilon version here because we don't want the nudging // to depend on the scroll position. transform.NudgeToIntegersFixedEpsilon(); } Matrix transform2d; if (aContainerFrame && (aState == LAYER_INACTIVE || aState == LAYER_SVG_EFFECTS) && (!aTransform || (aTransform->Is2D(&transform2d) && !transform2d.HasNonTranslation()))) { // When we have an inactive ContainerLayer, translate the container by the offset to the // reference frame (and offset all child layers by the reverse) so that the coordinate // space of the child layers isn't affected by scrolling. // This gets confusing for complicated transform (since we'd have to compute the scale // factors for the matrix), so we don't bother. Any frames that are building an nsDisplayTransform // for a css transform would have 0,0 as their offset to the reference frame, so this doesn't // matter. nsPoint appUnitOffset = aDisplayListBuilder->ToReferenceFrame(aContainerFrame); nscoord appUnitsPerDevPixel = aContainerFrame->PresContext()->AppUnitsPerDevPixel(); offset = nsIntPoint( NS_lround(NSAppUnitsToDoublePixels(appUnitOffset.x, appUnitsPerDevPixel)*aIncomingScale.mXScale), NS_lround(NSAppUnitsToDoublePixels(appUnitOffset.y, appUnitsPerDevPixel)*aIncomingScale.mYScale)); } transform = transform * Matrix4x4().Translate(offset.x + aIncomingScale.mOffset.x, offset.y + aIncomingScale.mOffset.y, 0); if (transform.IsSingular()) { return false; } bool canDraw2D = transform.CanDraw2D(&transform2d); gfxSize scale; // XXX Should we do something for 3D transforms? if (canDraw2D) { // If the container's transform is animated off main thread, fix a suitable scale size // for animation if (aContainerFrame->GetContent() && nsLayoutUtils::HasAnimationsForCompositor( aContainerFrame->GetContent(), eCSSProperty_transform)) { scale = nsLayoutUtils::ComputeSuitableScaleForAnimation(aContainerFrame->GetContent()); } else { // Scale factors are normalized to a power of 2 to reduce the number of resolution changes scale = RoundToFloatPrecision(ThebesMatrix(transform2d).ScaleFactors(true)); // For frames with a changing transform that's not just a translation, // round scale factors up to nearest power-of-2 boundary so that we don't // keep having to redraw the content as it scales up and down. Rounding up to nearest // power-of-2 boundary ensures we never scale up, only down --- avoiding // jaggies. It also ensures we never scale down by more than a factor of 2, // avoiding bad downscaling quality. Matrix frameTransform; if (ActiveLayerTracker::IsStyleAnimated(aContainerFrame, eCSSProperty_transform) && aTransform && (!aTransform->Is2D(&frameTransform) || frameTransform.HasNonTranslationOrFlip())) { // Don't clamp the scale factor when the new desired scale factor matches the old one // or it was previously unscaled. bool clamp = true; Matrix oldFrameTransform2d; if (aLayer->GetBaseTransform().Is2D(&oldFrameTransform2d)) { gfxSize oldScale = RoundToFloatPrecision(ThebesMatrix(oldFrameTransform2d).ScaleFactors(true)); if (oldScale == scale || oldScale == gfxSize(1.0, 1.0)) { clamp = false; } } if (clamp) { scale.width = gfxUtils::ClampToScaleFactor(scale.width); scale.height = gfxUtils::ClampToScaleFactor(scale.height); } } else { // XXX Do we need to move nearly-integer values to integers here? } } // If the scale factors are too small, just use 1.0. The content is being // scaled out of sight anyway. if (fabs(scale.width) < 1e-8 || fabs(scale.height) < 1e-8) { scale = gfxSize(1.0, 1.0); } // If this is a transform container layer, then pre-rendering might // mean we try render a layer bigger than the max texture size. Apply // clmaping to prevent this. if (aTransform) { RestrictScaleToMaxLayerSize(scale, aVisibleRect, aContainerFrame, aLayer); } } else { scale = gfxSize(1.0, 1.0); } // Store the inverse of our resolution-scale on the layer aLayer->SetBaseTransform(transform); aLayer->SetPreScale(1.0f/float(scale.width), 1.0f/float(scale.height)); aLayer->SetInheritedScale(aIncomingScale.mXScale, aIncomingScale.mYScale); aOutgoingScale = ContainerLayerParameters(scale.width, scale.height, -offset, aIncomingScale); if (aTransform) { aOutgoingScale.mInTransformedSubtree = true; if (ActiveLayerTracker::IsStyleAnimated(aContainerFrame, eCSSProperty_transform)) { aOutgoingScale.mInActiveTransformedSubtree = true; } } if (aLayerBuilder->IsBuildingRetainedLayers() && (!canDraw2D || transform2d.HasNonIntegerTranslation())) { aOutgoingScale.mDisableSubpixelAntialiasingInDescendants = true; } return true; } /* static */ PLDHashOperator FrameLayerBuilder::RestoreDisplayItemData(nsRefPtrHashKey* aEntry, void* aUserArg) { DisplayItemData* data = aEntry->GetKey(); uint32_t *generation = static_cast(aUserArg); if (data->mUsed && data->mContainerLayerGeneration >= *generation) { return PL_DHASH_REMOVE; } return PL_DHASH_NEXT; } /* static */ PLDHashOperator FrameLayerBuilder::RestoreThebesLayerItemEntries(ThebesLayerItemsEntry* aEntry, void* aUserArg) { uint32_t *generation = static_cast(aUserArg); if (aEntry->mContainerLayerGeneration >= *generation) { // We can just remove these items rather than attempting to revert them // because we're going to want to invalidate everything when transitioning // to component alpha flattening. return PL_DHASH_REMOVE; } for (uint32_t i = 0; i < aEntry->mItems.Length(); i++) { if (aEntry->mItems[i].mContainerLayerGeneration >= *generation) { aEntry->mItems.TruncateLength(i); return PL_DHASH_NEXT; } } return PL_DHASH_NEXT; } already_AddRefed FrameLayerBuilder::BuildContainerLayerFor(nsDisplayListBuilder* aBuilder, LayerManager* aManager, nsIFrame* aContainerFrame, nsDisplayItem* aContainerItem, nsDisplayList* aChildren, const ContainerLayerParameters& aParameters, const Matrix4x4* aTransform, uint32_t aFlags) { uint32_t containerDisplayItemKey = aContainerItem ? aContainerItem->GetPerFrameKey() : nsDisplayItem::TYPE_ZERO; NS_ASSERTION(aContainerFrame, "Container display items here should have a frame"); NS_ASSERTION(!aContainerItem || aContainerItem->Frame() == aContainerFrame, "Container display item must match given frame"); if (!aParameters.mXScale || !aParameters.mYScale) { return nullptr; } nsRefPtr containerLayer; if (aManager == mRetainingManager) { // Using GetOldLayerFor will search merged frames, as well as the underlying // frame. The underlying frame can change when a page scrolls, so this // avoids layer recreation in the situation that a new underlying frame is // picked for a layer. Layer* oldLayer = nullptr; if (aContainerItem) { oldLayer = GetOldLayerFor(aContainerItem); } else { DisplayItemData *data = GetOldLayerForFrame(aContainerFrame, containerDisplayItemKey); if (data) { oldLayer = data->mLayer; } } if (oldLayer) { NS_ASSERTION(oldLayer->Manager() == aManager, "Wrong manager"); if (oldLayer->HasUserData(&gThebesDisplayItemLayerUserData)) { // The old layer for this item is actually our ThebesLayer // because we rendered its layer into that ThebesLayer. So we // don't actually have a retained container layer. } else { NS_ASSERTION(oldLayer->GetType() == Layer::TYPE_CONTAINER, "Wrong layer type"); containerLayer = static_cast(oldLayer); containerLayer->SetMaskLayer(nullptr); } } } if (!containerLayer) { // No suitable existing layer was found. containerLayer = aManager->CreateContainerLayer(); if (!containerLayer) return nullptr; } LayerState state = aContainerItem ? aContainerItem->GetLayerState(aBuilder, aManager, aParameters) : LAYER_ACTIVE; if (state == LAYER_INACTIVE && nsDisplayItem::ForceActiveLayers()) { state = LAYER_ACTIVE; } if (aContainerItem && state == LAYER_ACTIVE_EMPTY) { // Empty layers only have metadata and should never have display items. We // early exit because later, invalidation will walk up the frame tree to // determine which thebes layer gets invalidated. Since an empty layer // should never have anything to paint, it should never be invalidated. NS_ASSERTION(aChildren->IsEmpty(), "Should have no children"); return containerLayer.forget(); } ContainerLayerParameters scaleParameters; nsRect bounds = aChildren->GetBounds(aBuilder); nsRect childrenVisible = aContainerItem ? aContainerItem->GetVisibleRectForChildren() : aContainerFrame->GetVisualOverflowRectRelativeToSelf(); if (!ChooseScaleAndSetTransform(this, aBuilder, aContainerFrame, bounds.Intersect(childrenVisible), aTransform, aParameters, containerLayer, state, scaleParameters)) { return nullptr; } uint32_t oldGeneration = mContainerLayerGeneration; mContainerLayerGeneration = ++mMaxContainerLayerGeneration; nsRefPtr thebesLayerInvalidRegion = nullptr; if (mRetainingManager) { if (aContainerItem) { StoreDataForFrame(aContainerItem, containerLayer, LAYER_ACTIVE); } else { StoreDataForFrame(aContainerFrame, containerDisplayItemKey, containerLayer, LAYER_ACTIVE); } } LayerManagerData* data = static_cast (aManager->GetUserData(&gLayerManagerUserData)); nsIntRect pixBounds; nscoord appUnitsPerDevPixel; uint32_t stateFlags = 0; if ((aContainerFrame->GetStateBits() & NS_FRAME_NO_COMPONENT_ALPHA) && mRetainingManager && mRetainingManager->ShouldAvoidComponentAlphaLayers()) { stateFlags = ContainerState::NO_COMPONENT_ALPHA; } uint32_t flags; while (true) { ContainerState state(aBuilder, aManager, aManager->GetLayerBuilder(), aContainerFrame, aContainerItem, bounds, containerLayer, scaleParameters); state.ProcessDisplayItems(aChildren, stateFlags); // Set CONTENT_COMPONENT_ALPHA if any of our children have it. // This is suboptimal ... a child could have text that's over transparent // pixels in its own layer, but over opaque parts of previous siblings. bool hasComponentAlphaChildren = false; pixBounds = state.ScaleToOutsidePixels(bounds, false); appUnitsPerDevPixel = state.GetAppUnitsPerDevPixel(); state.Finish(&flags, data, pixBounds, aChildren, hasComponentAlphaChildren); if (hasComponentAlphaChildren && mRetainingManager && mRetainingManager->ShouldAvoidComponentAlphaLayers() && containerLayer->HasMultipleChildren() && !stateFlags) { // Since we don't want any component alpha layers on BasicLayers, we repeat // the layer building process with this explicitely forced off. // We restore the previous FrameLayerBuilder state since the first set // of layer building will have changed it. stateFlags = ContainerState::NO_COMPONENT_ALPHA; data->mDisplayItems.EnumerateEntries(RestoreDisplayItemData, &mContainerLayerGeneration); mThebesLayerItems.EnumerateEntries(RestoreThebesLayerItemEntries, &mContainerLayerGeneration); aContainerFrame->AddStateBits(NS_FRAME_NO_COMPONENT_ALPHA); continue; } break; } // CONTENT_COMPONENT_ALPHA is propogated up to the nearest CONTENT_OPAQUE // ancestor so that BasicLayerManager knows when to copy the background into // pushed groups. Accelerated layers managers can't necessarily do this (only // when the visible region is a simple rect), so we propogate // CONTENT_COMPONENT_ALPHA_DESCENDANT all the way to the root. if (flags & Layer::CONTENT_COMPONENT_ALPHA) { flags |= Layer::CONTENT_COMPONENT_ALPHA_DESCENDANT; } // Make sure that rounding the visible region out didn't add any area // we won't paint if (aChildren->IsOpaque() && !aChildren->NeedsTransparentSurface()) { bounds.ScaleRoundIn(scaleParameters.mXScale, scaleParameters.mYScale); if (bounds.Contains(pixBounds.ToAppUnits(appUnitsPerDevPixel))) { // Clear CONTENT_COMPONENT_ALPHA and add CONTENT_OPAQUE instead. flags &= ~Layer::CONTENT_COMPONENT_ALPHA; flags |= Layer::CONTENT_OPAQUE; } } containerLayer->SetContentFlags(flags); // If aContainerItem is non-null some BuildContainerLayer further up the // call stack is responsible for setting containerLayer's visible region. if (!aContainerItem) { containerLayer->SetVisibleRegion(pixBounds); } if (aParameters.mLayerContentsVisibleRect) { *aParameters.mLayerContentsVisibleRect = pixBounds + scaleParameters.mOffset; } mContainerLayerGeneration = oldGeneration; nsPresContext::ClearNotifySubDocInvalidationData(containerLayer); return containerLayer.forget(); } Layer* FrameLayerBuilder::GetLeafLayerFor(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) { Layer* layer = GetOldLayerFor(aItem); if (!layer) return nullptr; if (layer->HasUserData(&gThebesDisplayItemLayerUserData)) { // This layer was created to render Thebes-rendered content for this // display item. The display item should not use it for its own // layer rendering. return nullptr; } layer->SetMaskLayer(nullptr); return layer; } /* static */ void FrameLayerBuilder::InvalidateAllLayers(LayerManager* aManager) { LayerManagerData* data = static_cast (aManager->GetUserData(&gLayerManagerUserData)); if (data) { data->mInvalidateAllLayers = true; } } /* static */ void FrameLayerBuilder::InvalidateAllLayersForFrame(nsIFrame *aFrame) { nsTArray *array = reinterpret_cast*>(aFrame->Properties().Get(LayerManagerDataProperty())); if (array) { for (uint32_t i = 0; i < array->Length(); i++) { array->ElementAt(i)->mParent->mInvalidateAllLayers = true; } } } /* static */ Layer* FrameLayerBuilder::GetDedicatedLayer(nsIFrame* aFrame, uint32_t aDisplayItemKey) { //TODO: This isn't completely correct, since a frame could exist as a layer // in the normal widget manager, and as a different layer (or no layer) // in the secondary manager nsTArray *array = reinterpret_cast*>(aFrame->Properties().Get(LayerManagerDataProperty())); if (array) { for (uint32_t i = 0; i < array->Length(); i++) { DisplayItemData *element = array->ElementAt(i); if (!element->mParent->mLayerManager->IsWidgetLayerManager()) { continue; } if (element->mDisplayItemKey == aDisplayItemKey) { if (element->mOptLayer) { return element->mOptLayer; } Layer* layer = element->mLayer; if (!layer->HasUserData(&gColorLayerUserData) && !layer->HasUserData(&gImageLayerUserData) && !layer->HasUserData(&gThebesDisplayItemLayerUserData)) { return layer; } } } } return nullptr; } static gfxSize PredictScaleForContent(nsIFrame* aFrame, nsIFrame* aAncestorWithScale, const gfxSize& aScale) { gfx3DMatrix transform = gfx3DMatrix::ScalingMatrix(aScale.width, aScale.height, 1.0); if (aFrame != aAncestorWithScale) { // aTransform is applied first, then the scale is applied to the result transform = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestorWithScale)*transform; } gfxMatrix transform2d; if (transform.CanDraw2D(&transform2d)) { return transform2d.ScaleFactors(true); } return gfxSize(1.0, 1.0); } gfxSize FrameLayerBuilder::GetThebesLayerScaleForFrame(nsIFrame* aFrame) { MOZ_ASSERT(aFrame, "need a frame"); nsIFrame* last = nullptr; for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) { last = f; if (nsLayoutUtils::IsPopup(f)) { // Don't examine ancestors of a popup. It won't make sense to check // the transform from some content inside the popup to some content // which is an ancestor of the popup. break; } nsTArray *array = reinterpret_cast*>(f->Properties().Get(LayerManagerDataProperty())); if (!array) { continue; } for (uint32_t i = 0; i < array->Length(); i++) { Layer* layer = array->ElementAt(i)->mLayer; ContainerLayer* container = layer->AsContainerLayer(); if (!container || !layer->Manager()->IsWidgetLayerManager()) { continue; } for (Layer* l = container->GetFirstChild(); l; l = l->GetNextSibling()) { ThebesDisplayItemLayerUserData* data = static_cast (l->GetUserData(&gThebesDisplayItemLayerUserData)); if (data) { return PredictScaleForContent(aFrame, f, gfxSize(data->mXScale, data->mYScale)); } } } } return PredictScaleForContent(aFrame, last, last->PresContext()->PresShell()->GetResolution()); } #ifdef MOZ_DUMP_PAINTING static void DebugPaintItem(nsRenderingContext* aDest, nsPresContext* aPresContext, nsDisplayItem *aItem, nsDisplayListBuilder* aBuilder) { bool snap; nsRect appUnitBounds = aItem->GetBounds(aBuilder, &snap); gfxRect bounds(appUnitBounds.x, appUnitBounds.y, appUnitBounds.width, appUnitBounds.height); bounds.ScaleInverse(aPresContext->AppUnitsPerDevPixel()); RefPtr tempDT = gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget( IntSize(bounds.width, bounds.height), SurfaceFormat::B8G8R8A8); nsRefPtr context = new gfxContext(tempDT); context->SetMatrix(gfxMatrix().Translate(-gfxPoint(bounds.x, bounds.y))); nsRefPtr ctx = new nsRenderingContext(); ctx->Init(aDest->DeviceContext(), context); aItem->Paint(aBuilder, ctx); RefPtr surface = tempDT->Snapshot(); DumpPaintedImage(aItem, surface); DrawTarget* drawTarget = aDest->ThebesContext()->GetDrawTarget(); Rect rect = ToRect(bounds); drawTarget->DrawSurface(surface, rect, Rect(Point(0,0), rect.Size())); aItem->SetPainted(); } #endif /* static */ void FrameLayerBuilder::RecomputeVisibilityForItems(nsTArray& aItems, nsDisplayListBuilder *aBuilder, const nsIntRegion& aRegionToDraw, const nsIntPoint& aOffset, int32_t aAppUnitsPerDevPixel, float aXScale, float aYScale) { uint32_t i; // Update visible regions. We perform visibility analysis to take account // of occlusion culling. nsRegion visible = aRegionToDraw.ToAppUnits(aAppUnitsPerDevPixel); visible.MoveBy(NSIntPixelsToAppUnits(aOffset.x, aAppUnitsPerDevPixel), NSIntPixelsToAppUnits(aOffset.y, aAppUnitsPerDevPixel)); visible.ScaleInverseRoundOut(aXScale, aYScale); for (i = aItems.Length(); i > 0; --i) { ClippedDisplayItem* cdi = &aItems[i - 1]; const DisplayItemClip& clip = cdi->mItem->GetClip(); NS_ASSERTION(AppUnitsPerDevPixel(cdi->mItem) == aAppUnitsPerDevPixel, "a thebes layer should contain items only at the same zoom"); NS_ABORT_IF_FALSE(clip.HasClip() || clip.GetRoundedRectCount() == 0, "If we have rounded rects, we must have a clip rect"); if (!clip.IsRectAffectedByClip(visible.GetBounds())) { cdi->mItem->RecomputeVisibility(aBuilder, &visible); continue; } // Do a little dance to account for the fact that we're clipping // to cdi->mClipRect nsRegion clipped; clipped.And(visible, clip.NonRoundedIntersection()); nsRegion finalClipped = clipped; cdi->mItem->RecomputeVisibility(aBuilder, &finalClipped); // If we have rounded clip rects, don't subtract from the visible // region since we aren't displaying everything inside the rect. if (clip.GetRoundedRectCount() == 0) { nsRegion removed; removed.Sub(clipped, finalClipped); nsRegion newVisible; newVisible.Sub(visible, removed); // Don't let the visible region get too complex. if (newVisible.GetNumRects() <= 15) { visible = newVisible; } } } } void FrameLayerBuilder::PaintItems(nsTArray& aItems, const nsIntRect& aRect, gfxContext *aContext, nsRenderingContext *aRC, nsDisplayListBuilder* aBuilder, nsPresContext* aPresContext, const nsIntPoint& aOffset, float aXScale, float aYScale, int32_t aCommonClipCount) { int32_t appUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel(); nsRect boundRect = aRect.ToAppUnits(appUnitsPerDevPixel); boundRect.MoveBy(NSIntPixelsToAppUnits(aOffset.x, appUnitsPerDevPixel), NSIntPixelsToAppUnits(aOffset.y, appUnitsPerDevPixel)); boundRect.ScaleInverseRoundOut(aXScale, aYScale); DisplayItemClip currentClip; bool currentClipIsSetInContext = false; DisplayItemClip tmpClip; for (uint32_t i = 0; i < aItems.Length(); ++i) { ClippedDisplayItem* cdi = &aItems[i]; nsRect paintRect = cdi->mItem->GetVisibleRect().Intersect(boundRect); if (paintRect.IsEmpty()) continue; #ifdef MOZ_DUMP_PAINTING PROFILER_LABEL_PRINTF("DisplayList", "Draw", js::ProfileEntry::Category::GRAPHICS, "%s %p", cdi->mItem->Name(), cdi->mItem); #else PROFILER_LABEL_PRINTF("DisplayList", "Draw", js::ProfileEntry::Category::GRAPHICS, "%p", cdi->mItem); #endif // If the new desired clip state is different from the current state, // update the clip. const DisplayItemClip* clip = &cdi->mItem->GetClip(); if (clip->GetRoundedRectCount() > 0 && !clip->IsRectClippedByRoundedCorner(cdi->mItem->GetVisibleRect())) { tmpClip = *clip; tmpClip.RemoveRoundedCorners(); clip = &tmpClip; } if (currentClipIsSetInContext != clip->HasClip() || (clip->HasClip() && *clip != currentClip)) { if (currentClipIsSetInContext) { aContext->Restore(); } currentClipIsSetInContext = clip->HasClip(); if (currentClipIsSetInContext) { currentClip = *clip; aContext->Save(); NS_ASSERTION(aCommonClipCount < 100, "Maybe you really do have more than a hundred clipping rounded rects, or maybe something has gone wrong."); currentClip.ApplyTo(aContext, aPresContext, aCommonClipCount); aContext->NewPath(); } } if (cdi->mInactiveLayerManager) { PaintInactiveLayer(aBuilder, cdi->mInactiveLayerManager, cdi->mItem, aContext, aRC); } else { nsIFrame* frame = cdi->mItem->Frame(); frame->AddStateBits(NS_FRAME_PAINTED_THEBES); #ifdef MOZ_DUMP_PAINTING if (gfxUtils::sDumpPainting) { DebugPaintItem(aRC, aPresContext, cdi->mItem, aBuilder); } else { #else { #endif cdi->mItem->Paint(aBuilder, aRC); } } if (CheckDOMModified()) break; } if (currentClipIsSetInContext) { aContext->Restore(); } } /** * Returns true if it is preferred to draw the list of display * items separately for each rect in the visible region rather * than clipping to a complex region. */ static bool ShouldDrawRectsSeparately(gfxContext* aContext, DrawRegionClip aClip) { if (!gfxPrefs::LayoutPaintRectsSeparately() || aClip == DrawRegionClip::CLIP_NONE) { return false; } DrawTarget *dt = aContext->GetDrawTarget(); return dt->GetBackendType() == BackendType::DIRECT2D; } static void DrawForcedBackgroundColor(gfxContext* aContext, Layer* aLayer, nscolor aBackgroundColor) { if (NS_GET_A(aBackgroundColor) > 0) { nsIntRect r = aLayer->GetVisibleRegion().GetBounds(); aContext->NewPath(); aContext->Rectangle(gfxRect(r.x, r.y, r.width, r.height)); aContext->SetColor(gfxRGBA(aBackgroundColor)); aContext->Fill(); } } /* * A note on residual transforms: * * In a transformed subtree we sometimes apply the ThebesLayer's * "residual transform" when drawing content into the ThebesLayer. * This is a translation by components in the range [-0.5,0.5) provided * by the layer system; applying the residual transform followed by the * transforms used by layer compositing ensures that the subpixel alignment * of the content of the ThebesLayer exactly matches what it would be if * we used cairo/Thebes to draw directly to the screen without going through * retained layer buffers. * * The visible and valid regions of the ThebesLayer are computed without * knowing the residual transform (because we don't know what the residual * transform is going to be until we've built the layer tree!). So we have to * consider whether content painted in the range [x, xmost) might be painted * outside the visible region we computed for that content. The visible region * would be [floor(x), ceil(xmost)). The content would be rendered at * [x + r, xmost + r), where -0.5 <= r < 0.5. So some half-rendered pixels could * indeed fall outside the computed visible region, which is not a big deal; * similar issues already arise when we snap cliprects to nearest pixels. * Note that if the rendering of the content is snapped to nearest pixels --- * which it often is --- then the content is actually rendered at * [snap(x + r), snap(xmost + r)). It turns out that floor(x) <= snap(x + r) * and ceil(xmost) >= snap(xmost + r), so the rendering of snapped content * always falls within the visible region we computed. */ /* static */ void FrameLayerBuilder::DrawThebesLayer(ThebesLayer* aLayer, gfxContext* aContext, const nsIntRegion& aRegionToDraw, DrawRegionClip aClip, const nsIntRegion& aRegionToInvalidate, void* aCallbackData) { PROFILER_LABEL("FrameLayerBuilder", "DrawThebesLayer", js::ProfileEntry::Category::GRAPHICS); nsDisplayListBuilder* builder = static_cast (aCallbackData); FrameLayerBuilder *layerBuilder = aLayer->Manager()->GetLayerBuilder(); NS_ASSERTION(layerBuilder, "Unexpectedly null layer builder!"); if (layerBuilder->CheckDOMModified()) return; ThebesLayerItemsEntry* entry = layerBuilder->mThebesLayerItems.GetEntry(aLayer); NS_ASSERTION(entry, "We shouldn't be drawing into a layer with no items!"); if (!entry->mContainerLayerFrame) { return; } ThebesDisplayItemLayerUserData* userData = static_cast (aLayer->GetUserData(&gThebesDisplayItemLayerUserData)); NS_ASSERTION(userData, "where did our user data go?"); bool shouldDrawRectsSeparately = ShouldDrawRectsSeparately(aContext, aClip); if (!shouldDrawRectsSeparately) { if (aClip == DrawRegionClip::DRAW_SNAPPED) { gfxUtils::ClipToRegionSnapped(aContext, aRegionToDraw); } else if (aClip == DrawRegionClip::DRAW) { gfxUtils::ClipToRegion(aContext, aRegionToDraw); } DrawForcedBackgroundColor(aContext, aLayer, userData->mForcedBackgroundColor); } // make the origin of the context coincide with the origin of the // ThebesLayer gfxContextMatrixAutoSaveRestore saveMatrix(aContext); nsIntPoint offset = GetTranslationForThebesLayer(aLayer); nsPresContext* presContext = entry->mContainerLayerFrame->PresContext(); if (!layerBuilder->GetContainingThebesLayerData()) { // Recompute visibility of items in our ThebesLayer. Note that this // recomputes visibility for all descendants of our display items too, // so there's no need to do this for the items in inactive ThebesLayers. int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel(); RecomputeVisibilityForItems(entry->mItems, builder, aRegionToDraw, offset, appUnitsPerDevPixel, userData->mXScale, userData->mYScale); } nsRefPtr rc = new nsRenderingContext(); rc->Init(presContext->DeviceContext(), aContext); if (shouldDrawRectsSeparately) { nsIntRegionRectIterator it(aRegionToDraw); while (const nsIntRect* iterRect = it.Next()) { gfxContextAutoSaveRestore save(aContext); aContext->NewPath(); aContext->Rectangle(*iterRect, aClip == DrawRegionClip::DRAW_SNAPPED); aContext->Clip(); DrawForcedBackgroundColor(aContext, aLayer, userData->mForcedBackgroundColor); // Apply the residual transform if it has been enabled, to ensure that // snapping when we draw into aContext exactly matches the ideal transform. // See above for why this is OK. aContext->Translate(aLayer->GetResidualTranslation() - gfxPoint(offset.x, offset.y)); aContext->Scale(userData->mXScale, userData->mYScale); layerBuilder->PaintItems(entry->mItems, *iterRect, aContext, rc, builder, presContext, offset, userData->mXScale, userData->mYScale, entry->mCommonClipCount); } } else { // Apply the residual transform if it has been enabled, to ensure that // snapping when we draw into aContext exactly matches the ideal transform. // See above for why this is OK. aContext->Translate(aLayer->GetResidualTranslation() - gfxPoint(offset.x, offset.y)); aContext->Scale(userData->mXScale, userData->mYScale); layerBuilder->PaintItems(entry->mItems, aRegionToDraw.GetBounds(), aContext, rc, builder, presContext, offset, userData->mXScale, userData->mYScale, entry->mCommonClipCount); } if (presContext->GetPaintFlashing() && !aLayer->Manager()->IsInactiveLayerManager()) { gfxContextAutoSaveRestore save(aContext); if (shouldDrawRectsSeparately) { if (aClip == DrawRegionClip::DRAW_SNAPPED) { gfxUtils::ClipToRegionSnapped(aContext, aRegionToDraw); } else if (aClip == DrawRegionClip::DRAW) { gfxUtils::ClipToRegion(aContext, aRegionToDraw); } } FlashPaint(aContext); } if (!aRegionToInvalidate.IsEmpty()) { aLayer->AddInvalidRect(aRegionToInvalidate.GetBounds()); } } bool FrameLayerBuilder::CheckDOMModified() { if (!mRootPresContext || mInitialDOMGeneration == mRootPresContext->GetDOMGeneration()) return false; if (mDetectedDOMModification) { // Don't spam the console with extra warnings return true; } mDetectedDOMModification = true; // Painting is not going to complete properly. There's not much // we can do here though. Invalidating the window to get another repaint // is likely to lead to an infinite repaint loop. NS_WARNING("Detected DOM modification during paint, bailing out!"); return true; } #ifdef MOZ_DUMP_PAINTING /* static */ void FrameLayerBuilder::DumpRetainedLayerTree(LayerManager* aManager, std::stringstream& aStream, bool aDumpHtml) { aManager->Dump(aStream, "", aDumpHtml); } #endif gfx::Rect CalculateBounds(const nsTArray& aRects, int32_t A2D) { nsRect bounds = aRects[0].mRect; for (uint32_t i = 1; i < aRects.Length(); ++i) { bounds.UnionRect(bounds, aRects[i].mRect); } return gfx::ToRect(nsLayoutUtils::RectToGfxRect(bounds, A2D)); } static void SetClipCount(ThebesDisplayItemLayerUserData* aThebesData, uint32_t aClipCount) { if (aThebesData) { aThebesData->mMaskClipCount = aClipCount; } } void ContainerState::SetupMaskLayer(Layer *aLayer, const DisplayItemClip& aClip, const nsIntRegion& aLayerVisibleRegion, uint32_t aRoundedRectClipCount) { // if the number of clips we are going to mask has decreased, then aLayer might have // cached graphics which assume the existence of a soon-to-be non-existent mask layer // in that case, invalidate the whole layer. ThebesDisplayItemLayerUserData* thebesData = GetThebesDisplayItemLayerUserData(aLayer); if (thebesData && aRoundedRectClipCount < thebesData->mMaskClipCount) { ThebesLayer* thebes = aLayer->AsThebesLayer(); thebes->InvalidateRegion(thebes->GetValidRegion().GetBounds()); } // don't build an unnecessary mask nsIntRect layerBounds = aLayerVisibleRegion.GetBounds(); if (aClip.GetRoundedRectCount() == 0 || aRoundedRectClipCount == 0 || layerBounds.IsEmpty()) { SetClipCount(thebesData, 0); return; } // check if we can re-use the mask layer nsRefPtr maskLayer = CreateOrRecycleMaskImageLayerFor(aLayer); MaskLayerUserData* userData = GetMaskLayerUserData(maskLayer); MaskLayerUserData newData; aClip.AppendRoundedRects(&newData.mRoundedClipRects, aRoundedRectClipCount); newData.mScaleX = mParameters.mXScale; newData.mScaleY = mParameters.mYScale; newData.mOffset = mParameters.mOffset; newData.mAppUnitsPerDevPixel = mContainerFrame->PresContext()->AppUnitsPerDevPixel(); if (*userData == newData) { aLayer->SetMaskLayer(maskLayer); SetClipCount(thebesData, aRoundedRectClipCount); return; } // calculate a more precise bounding rect gfx::Rect boundingRect = CalculateBounds(newData.mRoundedClipRects, newData.mAppUnitsPerDevPixel); boundingRect.Scale(mParameters.mXScale, mParameters.mYScale); uint32_t maxSize = mManager->GetMaxTextureSize(); NS_ASSERTION(maxSize > 0, "Invalid max texture size"); gfx::Size surfaceSize(std::min(boundingRect.Width(), maxSize), std::min(boundingRect.Height(), maxSize)); // maskTransform is applied to the clip when it is painted into the mask (as a // component of imageTransform), and its inverse used when the mask is used for // masking. // It is the transform from the masked layer's space to mask space gfx::Matrix maskTransform; maskTransform.Scale(surfaceSize.width/boundingRect.Width(), surfaceSize.height/boundingRect.Height()); gfx::Point p = boundingRect.TopLeft(); maskTransform.Translate(-p.x, -p.y); // imageTransform is only used when the clip is painted to the mask gfx::Matrix imageTransform = maskTransform; imageTransform.Scale(mParameters.mXScale, mParameters.mYScale); nsAutoPtr newKey( new MaskLayerImageCache::MaskLayerImageKey()); // copy and transform the rounded rects for (uint32_t i = 0; i < newData.mRoundedClipRects.Length(); ++i) { newKey->mRoundedClipRects.AppendElement( MaskLayerImageCache::PixelRoundedRect(newData.mRoundedClipRects[i], mContainerFrame->PresContext())); newKey->mRoundedClipRects[i].ScaleAndTranslate(imageTransform); } const MaskLayerImageCache::MaskLayerImageKey* lookupKey = newKey; // check to see if we can reuse a mask image nsRefPtr container = GetMaskLayerImageCache()->FindImageFor(&lookupKey); if (!container) { IntSize surfaceSizeInt(NSToIntCeil(surfaceSize.width), NSToIntCeil(surfaceSize.height)); // no existing mask image, so build a new one RefPtr dt = aLayer->Manager()->CreateOptimalMaskDrawTarget(surfaceSizeInt); // fail if we can't get the right surface if (!dt) { NS_WARNING("Could not create DrawTarget for mask layer."); SetClipCount(thebesData, 0); return; } nsRefPtr context = new gfxContext(dt); context->Multiply(ThebesMatrix(imageTransform)); // paint the clipping rects with alpha to create the mask context->SetColor(gfxRGBA(1, 1, 1, 1)); aClip.DrawRoundedRectsTo(context, newData.mAppUnitsPerDevPixel, 0, aRoundedRectClipCount); RefPtr surface = dt->Snapshot(); // build the image and container container = aLayer->Manager()->CreateImageContainer(); NS_ASSERTION(container, "Could not create image container for mask layer."); nsRefPtr image = container->CreateImage(ImageFormat::CAIRO_SURFACE); NS_ASSERTION(image, "Could not create image container for mask layer."); CairoImage::Data data; data.mSize = surfaceSizeInt; data.mSourceSurface = surface; static_cast(image.get())->SetData(data); container->SetCurrentImageInTransaction(image); GetMaskLayerImageCache()->PutImage(newKey.forget(), container); } maskLayer->SetContainer(container); maskTransform.Invert(); Matrix4x4 matrix = Matrix4x4::From2D(maskTransform); matrix.Translate(mParameters.mOffset.x, mParameters.mOffset.y, 0); maskLayer->SetBaseTransform(matrix); // save the details of the clip in user data userData->mScaleX = newData.mScaleX; userData->mScaleY = newData.mScaleY; userData->mOffset = newData.mOffset; userData->mAppUnitsPerDevPixel = newData.mAppUnitsPerDevPixel; userData->mRoundedClipRects.SwapElements(newData.mRoundedClipRects); userData->mImageKey = lookupKey; aLayer->SetMaskLayer(maskLayer); SetClipCount(thebesData, aRoundedRectClipCount); return; } } // namespace mozilla