mirror of
https://github.com/mozilla/gecko-dev.git
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741 lines
27 KiB
C++
741 lines
27 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef FRAMELAYERBUILDER_H_
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#define FRAMELAYERBUILDER_H_
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#include "nsTHashtable.h"
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#include "nsHashKeys.h"
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#include "nsTArray.h"
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#include "nsRegion.h"
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#include "nsIFrame.h"
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#include "ImageLayers.h"
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#include "DisplayItemClip.h"
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#include "mozilla/layers/LayersTypes.h"
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#include "LayerState.h"
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class nsDisplayListBuilder;
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class nsDisplayList;
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class nsDisplayItem;
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class gfxContext;
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class nsDisplayItemGeometry;
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namespace mozilla {
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namespace layers {
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class ContainerLayer;
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class LayerManager;
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class BasicLayerManager;
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class PaintedLayer;
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}
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namespace gfx {
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class Matrix4x4;
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}
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class FrameLayerBuilder;
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class LayerManagerData;
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class PaintedLayerData;
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class ContainerState;
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class RefCountedRegion {
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private:
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~RefCountedRegion() {}
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public:
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NS_INLINE_DECL_REFCOUNTING(RefCountedRegion)
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RefCountedRegion() : mIsInfinite(false) {}
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nsRegion mRegion;
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bool mIsInfinite;
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};
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struct NewLayerEntry;
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struct ContainerLayerParameters {
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ContainerLayerParameters()
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: mXScale(1)
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, mYScale(1)
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, mLayerContentsVisibleRect(nullptr)
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, mBackgroundColor(NS_RGBA(0,0,0,0))
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, mInTransformedSubtree(false)
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, mInActiveTransformedSubtree(false)
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, mDisableSubpixelAntialiasingInDescendants(false)
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, mInLowPrecisionDisplayPort(false)
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{}
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ContainerLayerParameters(float aXScale, float aYScale)
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: mXScale(aXScale)
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, mYScale(aYScale)
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, mLayerContentsVisibleRect(nullptr)
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, mBackgroundColor(NS_RGBA(0,0,0,0))
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, mInTransformedSubtree(false)
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, mInActiveTransformedSubtree(false)
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, mDisableSubpixelAntialiasingInDescendants(false)
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, mInLowPrecisionDisplayPort(false)
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{}
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ContainerLayerParameters(float aXScale, float aYScale,
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const nsIntPoint& aOffset,
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const ContainerLayerParameters& aParent)
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: mXScale(aXScale)
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, mYScale(aYScale)
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, mLayerContentsVisibleRect(nullptr)
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, mOffset(aOffset)
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, mBackgroundColor(aParent.mBackgroundColor)
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, mInTransformedSubtree(aParent.mInTransformedSubtree)
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, mInActiveTransformedSubtree(aParent.mInActiveTransformedSubtree)
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, mDisableSubpixelAntialiasingInDescendants(aParent.mDisableSubpixelAntialiasingInDescendants)
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, mInLowPrecisionDisplayPort(aParent.mInLowPrecisionDisplayPort)
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{}
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float mXScale, mYScale;
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/**
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* If non-null, the rectangle in which BuildContainerLayerFor stores the
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* visible rect of the layer, in the coordinate system of the created layer.
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*/
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nsIntRect* mLayerContentsVisibleRect;
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/**
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* An offset to apply to all child layers created.
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*/
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nsIntPoint mOffset;
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nscolor mBackgroundColor;
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bool mInTransformedSubtree;
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bool mInActiveTransformedSubtree;
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bool mDisableSubpixelAntialiasingInDescendants;
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bool mInLowPrecisionDisplayPort;
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/**
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* When this is false, PaintedLayer coordinates are drawn to with an integer
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* translation and the scale in mXScale/mYScale.
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*/
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bool AllowResidualTranslation()
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{
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// If we're in a transformed subtree, but no ancestor transform is actively
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// changing, we'll use the residual translation when drawing into the
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// PaintedLayer to ensure that snapping exactly matches the ideal transform.
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return mInTransformedSubtree && !mInActiveTransformedSubtree;
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}
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};
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/**
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* The FrameLayerBuilder is responsible for converting display lists
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* into layer trees. Every LayerManager needs a unique FrameLayerBuilder
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* to build layers.
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*
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* The most important API in this class is BuildContainerLayerFor. This
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* method takes a display list as input and constructs a ContainerLayer
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* with child layers that render the contents of the display list. It
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* records the relationship between frames and layers.
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*
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* That data enables us to retain layer trees. When constructing a
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* ContainerLayer, we first check to see if there's an existing
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* ContainerLayer for the same frame that can be recycled. If we recycle
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* it, we also try to reuse its existing PaintedLayer children to render
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* the display items without layers of their own. The idea is that by
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* recycling layers deterministically, we can ensure that when nothing
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* changes in a display list, we will reuse the existing layers without
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* changes.
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*
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* We expose a GetLeafLayerFor method that can be called by display items
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* that make their own layers (e.g. canvas and video); this method
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* locates the last layer used to render the display item, if any, and
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* return it as a candidate for recycling.
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*
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* FrameLayerBuilder sets up PaintedLayers so that 0,0 in the Painted layer
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* corresponds to the (pixel-snapped) top-left of the aAnimatedGeometryRoot.
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* It sets up ContainerLayers so that 0,0 in the container layer
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* corresponds to the snapped top-left of the display item reference frame.
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*
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* When we construct a container layer, we know the transform that will be
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* applied to the layer. If the transform scales the content, we can get
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* better results when intermediate buffers are used by pushing some scale
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* from the container's transform down to the children. For PaintedLayer
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* children, the scaling can be achieved by changing the size of the layer
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* and drawing into it with increased or decreased resolution. By convention,
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* integer types (nsIntPoint/nsIntSize/nsIntRect/nsIntRegion) are all in layer
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* coordinates, post-scaling, whereas appunit types are all pre-scaling.
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*/
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class FrameLayerBuilder : public layers::LayerUserData {
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public:
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typedef layers::ContainerLayer ContainerLayer;
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typedef layers::Layer Layer;
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typedef layers::PaintedLayer PaintedLayer;
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typedef layers::ImageLayer ImageLayer;
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typedef layers::LayerManager LayerManager;
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typedef layers::BasicLayerManager BasicLayerManager;
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typedef layers::EventRegions EventRegions;
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FrameLayerBuilder() :
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mRetainingManager(nullptr),
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mDetectedDOMModification(false),
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mInvalidateAllLayers(false),
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mInLayerTreeCompressionMode(false),
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mContainerLayerGeneration(0),
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mMaxContainerLayerGeneration(0)
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{
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MOZ_COUNT_CTOR(FrameLayerBuilder);
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}
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~FrameLayerBuilder()
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{
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MOZ_COUNT_DTOR(FrameLayerBuilder);
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}
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static void Shutdown();
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void Init(nsDisplayListBuilder* aBuilder, LayerManager* aManager,
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PaintedLayerData* aLayerData = nullptr,
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ContainerState* aContainingContainerState = nullptr);
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/**
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* Call this to notify that we have just started a transaction on the
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* retained layer manager aManager.
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*/
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void DidBeginRetainedLayerTransaction(LayerManager* aManager);
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/**
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* Call this just before we end a transaction.
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*/
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void WillEndTransaction();
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/**
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* Call this after we end a transaction.
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*/
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void DidEndTransaction();
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enum {
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CONTAINER_NOT_CLIPPED_BY_ANCESTORS = 0x01,
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/**
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* Set this when pulling an opaque background color from behind the
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* container layer into the container doesn't change the visual results,
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* given the effects you're going to apply to the container layer.
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* For example, this is compatible with opacity or clipping/masking, but
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* not with non-OVER blend modes or filters.
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*/
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CONTAINER_ALLOW_PULL_BACKGROUND_COLOR = 0x02
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};
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/**
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* Build a container layer for a display item that contains a child
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* list, either reusing an existing one or creating a new one. It
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* sets the container layer children to layers which together render
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* the contents of the display list. It reuses existing layers from
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* the retained layer manager if possible.
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* aContainer may be null, in which case we construct a root layer.
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* This gets called by display list code. It calls BuildLayer on the
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* items in the display list, making items with their own layers
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* children of the new container, and assigning all other items to
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* PaintedLayer children created and managed by the FrameLayerBuilder.
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* Returns a layer with clip rect cleared; it is the
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* caller's responsibility to add any clip rect. The visible region
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* is set based on what's in the layer.
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* The container layer is transformed by aTransform (if non-null), and
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* the result is transformed by the scale factors in aContainerParameters.
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* aChildren is modified due to display item merging and flattening.
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* The visible region of the returned layer is set only if aContainerItem
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* is null.
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*/
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already_AddRefed<ContainerLayer>
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BuildContainerLayerFor(nsDisplayListBuilder* aBuilder,
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LayerManager* aManager,
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nsIFrame* aContainerFrame,
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nsDisplayItem* aContainerItem,
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nsDisplayList* aChildren,
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const ContainerLayerParameters& aContainerParameters,
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const gfx::Matrix4x4* aTransform,
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uint32_t aFlags = 0);
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/**
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* Get a retained layer for a display item that needs to create its own
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* layer for rendering (i.e. under nsDisplayItem::BuildLayer). Returns
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* null if no retained layer is available, which usually means that this
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* display item didn't have a layer before so the caller will
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* need to create one.
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* Returns a layer with clip rect cleared; it is the
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* caller's responsibility to add any clip rect and set the visible
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* region.
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*/
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Layer* GetLeafLayerFor(nsDisplayListBuilder* aBuilder,
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nsDisplayItem* aItem);
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/**
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* Call this to force all retained layers to be discarded and recreated at
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* the next paint.
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*/
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static void InvalidateAllLayers(LayerManager* aManager);
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static void InvalidateAllLayersForFrame(nsIFrame *aFrame);
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/**
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* Call this to determine if a frame has a dedicated (non-Painted) layer
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* for the given display item key. If there isn't one, we return null,
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* otherwise we return the layer.
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*/
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static Layer* GetDedicatedLayer(nsIFrame* aFrame, uint32_t aDisplayItemKey);
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/**
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* This callback must be provided to EndTransaction. The callback data
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* must be the nsDisplayListBuilder containing this FrameLayerBuilder.
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* This function can be called multiple times in a row to draw
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* different regions.
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*/
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static void DrawPaintedLayer(PaintedLayer* aLayer,
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gfxContext* aContext,
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const nsIntRegion& aRegionToDraw,
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mozilla::layers::DrawRegionClip aClip,
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const nsIntRegion& aRegionToInvalidate,
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void* aCallbackData);
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/**
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* Dumps this FrameLayerBuilder's retained layer manager's retained
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* layer tree. Defaults to dumping to stdout in non-HTML format.
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*/
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static void DumpRetainedLayerTree(LayerManager* aManager, std::stringstream& aStream, bool aDumpHtml = false);
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/**
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* Returns the most recently allocated geometry item for the given display
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* item.
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*
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* XXX(seth): The current implementation must iterate through all display
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* items allocated for this display item's frame. This may lead to O(n^2)
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* behavior in some situations.
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*/
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static nsDisplayItemGeometry* GetMostRecentGeometry(nsDisplayItem* aItem);
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/******* PRIVATE METHODS to FrameLayerBuilder.cpp ********/
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/* These are only in the public section because they need
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* to be called by file-scope helper functions in FrameLayerBuilder.cpp.
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*/
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/**
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* Record aItem as a display item that is rendered by aLayer.
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*
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* @param aLayer Layer that the display item will be rendered into
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* @param aItem Display item to be drawn.
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* @param aLayerState What LayerState the item is using.
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* @param aTopLeft offset from active scrolled root to reference frame
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* @param aManager If the layer is in the LAYER_INACTIVE state,
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* then this is the temporary layer manager to draw with.
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*/
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void AddLayerDisplayItem(Layer* aLayer,
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nsDisplayItem* aItem,
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LayerState aLayerState,
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const nsPoint& aTopLeft,
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BasicLayerManager* aManager);
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/**
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* Record aItem as a display item that is rendered by the PaintedLayer
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* aLayer, with aClipRect, where aContainerLayerFrame is the frame
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* for the container layer this ThebesItem belongs to.
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* aItem must have an underlying frame.
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* @param aTopLeft offset from active scrolled root to reference frame
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*/
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void AddPaintedDisplayItem(PaintedLayerData* aLayer,
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nsDisplayItem* aItem,
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const DisplayItemClip& aClip,
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const nsIntRect& aItemVisibleRect,
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ContainerState& aContainerState,
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LayerState aLayerState,
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const nsPoint& aTopLeft);
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/**
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* Calls GetOldLayerForFrame on the underlying frame of the display item,
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* and each subsequent merged frame if no layer is found for the underlying
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* frame.
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*/
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Layer* GetOldLayerFor(nsDisplayItem* aItem,
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nsDisplayItemGeometry** aOldGeometry = nullptr,
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DisplayItemClip** aOldClip = nullptr);
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void ClearCachedGeometry(nsDisplayItem* aItem);
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static Layer* GetDebugOldLayerFor(nsIFrame* aFrame, uint32_t aDisplayItemKey);
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/**
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* Destroy any stored LayerManagerDataProperty and the associated data for
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* aFrame.
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*/
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static void DestroyDisplayItemDataFor(nsIFrame* aFrame);
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LayerManager* GetRetainingLayerManager() { return mRetainingManager; }
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/**
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* Returns true if the given display item was rendered during the previous
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* paint. Returns false otherwise.
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*/
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static bool HasRetainedDataFor(nsIFrame* aFrame, uint32_t aDisplayItemKey);
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class DisplayItemData;
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typedef void (*DisplayItemDataCallback)(nsIFrame *aFrame, DisplayItemData* aItem);
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static void IterateRetainedDataFor(nsIFrame* aFrame, DisplayItemDataCallback aCallback);
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/**
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* Save transform that was in aLayer when we last painted, and the position
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* of the active scrolled root frame. It must be an integer
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* translation.
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*/
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void SavePreviousDataForLayer(PaintedLayer* aLayer, uint32_t aClipCount);
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/**
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* Get the translation transform that was in aLayer when we last painted. It's either
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* the transform saved by SaveLastPaintTransform, or else the transform
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* that's currently in the layer (which must be an integer translation).
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*/
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nsIntPoint GetLastPaintOffset(PaintedLayer* aLayer);
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/**
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* Return the resolution at which we expect to render aFrame's contents,
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* assuming they are being painted to retained layers. This takes into account
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* the resolution the contents of the ContainerLayer containing aFrame are
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* being rendered at, as well as any currently-inactive transforms between
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* aFrame and that container layer.
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*/
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static gfxSize GetPaintedLayerScaleForFrame(nsIFrame* aFrame);
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/**
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* Stores a Layer as the dedicated layer in the DisplayItemData for a given frame/key pair.
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*
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* Used when we optimize a PaintedLayer into an ImageLayer and want to retroactively update the
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* DisplayItemData so we can retrieve the layer from within layout.
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*/
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void StoreOptimizedLayerForFrame(nsDisplayItem* aItem, Layer* aLayer);
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NS_DECLARE_FRAME_PROPERTY_WITH_FRAME_IN_DTOR(LayerManagerDataProperty,
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RemoveFrameFromLayerManager)
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/**
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* Retained data storage:
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*
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* Each layer manager (widget, and inactive) stores a LayerManagerData object
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* that keeps a hash-set of DisplayItemData items that were drawn into it.
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* Each frame also keeps a list of DisplayItemData pointers that were
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* created for that frame. DisplayItemData objects manage these lists automatically.
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*
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* During layer construction we update the data in the LayerManagerData object, marking
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* items that are modified. At the end we sweep the LayerManagerData hash-set and remove
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* all items that haven't been modified.
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*/
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/**
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* Retained data for a display item.
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*/
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class DisplayItemData MOZ_FINAL {
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public:
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friend class FrameLayerBuilder;
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uint32_t GetDisplayItemKey() { return mDisplayItemKey; }
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Layer* GetLayer() { return mLayer; }
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nsDisplayItemGeometry* GetGeometry() const { return mGeometry.get(); }
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void Invalidate() { mIsInvalid = true; }
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private:
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DisplayItemData(LayerManagerData* aParent,
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uint32_t aKey,
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nsIFrame* aFrame = nullptr);
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DisplayItemData(DisplayItemData &toCopy);
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/**
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* Removes any references to this object from frames
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* in mFrameList.
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*/
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~DisplayItemData();
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NS_INLINE_DECL_REFCOUNTING(DisplayItemData)
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/**
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* Associates this DisplayItemData with a frame, and adds it
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* to the LayerManagerDataProperty list on the frame.
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*/
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void AddFrame(nsIFrame* aFrame);
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void RemoveFrame(nsIFrame* aFrame);
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const nsTArray<nsIFrame*>& GetFrameListChanges();
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/**
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* Updates the contents of this item to a new set of data, instead of allocating a new
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* object.
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* Set the passed in parameters, and clears the opt layer and inactive manager.
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* Parent, and display item key are assumed to be the same.
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*
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* EndUpdate must be called before the end of the transaction to complete the update.
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*/
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void BeginUpdate(Layer* aLayer, LayerState aState,
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uint32_t aContainerLayerGeneration, nsDisplayItem* aItem = nullptr);
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/**
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* Completes the update of this, and removes any references to data that won't live
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* longer than the transaction.
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*
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* Updates the geometry, frame list and clip.
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* For items within a PaintedLayer, a geometry object must be specifed to retain
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* until the next transaction.
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*
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*/
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void EndUpdate(nsAutoPtr<nsDisplayItemGeometry> aGeometry);
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void EndUpdate();
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LayerManagerData* mParent;
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nsRefPtr<Layer> mLayer;
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nsRefPtr<Layer> mOptLayer;
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nsRefPtr<BasicLayerManager> mInactiveManager;
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nsAutoTArray<nsIFrame*, 1> mFrameList;
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nsAutoPtr<nsDisplayItemGeometry> mGeometry;
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DisplayItemClip mClip;
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uint32_t mDisplayItemKey;
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uint32_t mContainerLayerGeneration;
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LayerState mLayerState;
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|
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/**
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* Temporary stoarage of the display item being referenced, only valid between
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* BeginUpdate and EndUpdate.
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*/
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nsDisplayItem* mItem;
|
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nsAutoTArray<nsIFrame*, 1> mFrameListChanges;
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|
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/**
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* Used to track if data currently stored in mFramesWithLayers (from an existing
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* paint) has been updated in the current paint.
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*/
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bool mUsed;
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bool mIsInvalid;
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};
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protected:
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friend class LayerManagerData;
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|
|
static void RemoveFrameFromLayerManager(nsIFrame* aFrame, void* aPropertyValue);
|
|
|
|
/**
|
|
* Given a frame and a display item key that uniquely identifies a
|
|
* display item for the frame, find the layer that was last used to
|
|
* render that display item. Returns null if there is no such layer.
|
|
* This could be a dedicated layer for the display item, or a PaintedLayer
|
|
* that renders many display items.
|
|
*/
|
|
DisplayItemData* GetOldLayerForFrame(nsIFrame* aFrame, uint32_t aDisplayItemKey);
|
|
|
|
/**
|
|
* Stores DisplayItemData associated with aFrame, stores the data in
|
|
* mNewDisplayItemData.
|
|
*/
|
|
DisplayItemData* StoreDataForFrame(nsDisplayItem* aItem, Layer* aLayer, LayerState aState);
|
|
void StoreDataForFrame(nsIFrame* aFrame,
|
|
uint32_t aDisplayItemKey,
|
|
Layer* aLayer,
|
|
LayerState aState);
|
|
|
|
// Flash the area within the context clip if paint flashing is enabled.
|
|
static void FlashPaint(gfxContext *aContext);
|
|
|
|
/*
|
|
* Get the DisplayItemData array associated with this frame, or null if one
|
|
* doesn't exist.
|
|
*
|
|
* Note that the pointer returned here is only valid so long as you don't
|
|
* poke the LayerManagerData's mFramesWithLayers hashtable.
|
|
*/
|
|
DisplayItemData* GetDisplayItemData(nsIFrame *aFrame, uint32_t aKey);
|
|
|
|
/*
|
|
* Get the DisplayItemData associated with this frame / display item pair,
|
|
* using the LayerManager instead of FrameLayerBuilder.
|
|
*/
|
|
static DisplayItemData* GetDisplayItemDataForManager(nsIFrame* aFrame,
|
|
uint32_t aDisplayItemKey,
|
|
LayerManager* aManager);
|
|
static DisplayItemData* GetDisplayItemDataForManager(nsIFrame* aFrame,
|
|
uint32_t aDisplayItemKey);
|
|
static DisplayItemData* GetDisplayItemDataForManager(nsDisplayItem* aItem, LayerManager* aManager);
|
|
static DisplayItemData* GetDisplayItemDataForManager(nsIFrame* aFrame,
|
|
uint32_t aDisplayItemKey,
|
|
LayerManagerData* aData);
|
|
|
|
static PLDHashOperator DumpDisplayItemDataForFrame(nsRefPtrHashKey<DisplayItemData>* aEntry,
|
|
void* aClosure);
|
|
/**
|
|
* We store one of these for each display item associated with a
|
|
* PaintedLayer, in a hashtable that maps each PaintedLayer to an array
|
|
* of ClippedDisplayItems. (PaintedLayerItemsEntry is the hash entry
|
|
* for that hashtable.)
|
|
* These are only stored during the paint process, so that the
|
|
* DrawPaintedLayer callback can figure out which items to draw for the
|
|
* PaintedLayer.
|
|
*/
|
|
struct ClippedDisplayItem {
|
|
ClippedDisplayItem(nsDisplayItem* aItem, uint32_t aGeneration)
|
|
: mItem(aItem), mContainerLayerGeneration(aGeneration)
|
|
{
|
|
}
|
|
|
|
~ClippedDisplayItem();
|
|
|
|
nsDisplayItem* mItem;
|
|
|
|
/**
|
|
* If the display item is being rendered as an inactive
|
|
* layer, then this stores the layer manager being
|
|
* used for the inactive transaction.
|
|
*/
|
|
nsRefPtr<LayerManager> mInactiveLayerManager;
|
|
|
|
uint32_t mContainerLayerGeneration;
|
|
|
|
};
|
|
|
|
static void RecomputeVisibilityForItems(nsTArray<ClippedDisplayItem>& aItems,
|
|
nsDisplayListBuilder* aBuilder,
|
|
const nsIntRegion& aRegionToDraw,
|
|
const nsIntPoint& aOffset,
|
|
int32_t aAppUnitsPerDevPixel,
|
|
float aXScale,
|
|
float aYScale);
|
|
|
|
void PaintItems(nsTArray<ClippedDisplayItem>& aItems,
|
|
const nsIntRect& aRect,
|
|
gfxContext* aContext,
|
|
nsRenderingContext* aRC,
|
|
nsDisplayListBuilder* aBuilder,
|
|
nsPresContext* aPresContext,
|
|
const nsIntPoint& aOffset,
|
|
float aXScale, float aYScale,
|
|
int32_t aCommonClipCount);
|
|
|
|
/**
|
|
* We accumulate ClippedDisplayItem elements in a hashtable during
|
|
* the paint process. This is the hashentry for that hashtable.
|
|
*/
|
|
public:
|
|
class PaintedLayerItemsEntry : public nsPtrHashKey<PaintedLayer> {
|
|
public:
|
|
explicit PaintedLayerItemsEntry(const PaintedLayer *key)
|
|
: nsPtrHashKey<PaintedLayer>(key)
|
|
, mContainerLayerFrame(nullptr)
|
|
, mLastCommonClipCount(0)
|
|
, mContainerLayerGeneration(0)
|
|
, mHasExplicitLastPaintOffset(false)
|
|
, mCommonClipCount(0)
|
|
{}
|
|
PaintedLayerItemsEntry(const PaintedLayerItemsEntry &toCopy) :
|
|
nsPtrHashKey<PaintedLayer>(toCopy.mKey), mItems(toCopy.mItems)
|
|
{
|
|
NS_ERROR("Should never be called, since we ALLOW_MEMMOVE");
|
|
}
|
|
|
|
nsTArray<ClippedDisplayItem> mItems;
|
|
nsIFrame* mContainerLayerFrame;
|
|
// The translation set on this PaintedLayer before we started updating the
|
|
// layer tree.
|
|
nsIntPoint mLastPaintOffset;
|
|
uint32_t mLastCommonClipCount;
|
|
|
|
uint32_t mContainerLayerGeneration;
|
|
bool mHasExplicitLastPaintOffset;
|
|
/**
|
|
* The first mCommonClipCount rounded rectangle clips are identical for
|
|
* all items in the layer. Computed in PaintedLayerData.
|
|
*/
|
|
uint32_t mCommonClipCount;
|
|
|
|
enum { ALLOW_MEMMOVE = true };
|
|
};
|
|
|
|
/**
|
|
* Get the PaintedLayerItemsEntry object associated with aLayer in this
|
|
* FrameLayerBuilder
|
|
*/
|
|
PaintedLayerItemsEntry* GetPaintedLayerItemsEntry(PaintedLayer* aLayer)
|
|
{
|
|
return mPaintedLayerItems.GetEntry(aLayer);
|
|
}
|
|
|
|
PaintedLayerData* GetContainingPaintedLayerData()
|
|
{
|
|
return mContainingPaintedLayer;
|
|
}
|
|
|
|
bool IsBuildingRetainedLayers()
|
|
{
|
|
return !mContainingPaintedLayer && mRetainingManager;
|
|
}
|
|
|
|
ContainerState* GetContainingContainerState()
|
|
{
|
|
return mContainingContainerState;
|
|
}
|
|
|
|
/**
|
|
* Attempt to build the most compressed layer tree possible, even if it means
|
|
* throwing away existing retained buffers.
|
|
*/
|
|
void SetLayerTreeCompressionMode() { mInLayerTreeCompressionMode = true; }
|
|
bool CheckInLayerTreeCompressionMode();
|
|
|
|
void ComputeGeometryChangeForItem(DisplayItemData* aData);
|
|
|
|
protected:
|
|
static PLDHashOperator ProcessRemovedDisplayItems(nsRefPtrHashKey<DisplayItemData>* aEntry,
|
|
void* aUserArg);
|
|
static PLDHashOperator RestoreDisplayItemData(nsRefPtrHashKey<DisplayItemData>* aEntry,
|
|
void *aUserArg);
|
|
|
|
static PLDHashOperator RestorePaintedLayerItemEntries(PaintedLayerItemsEntry* aEntry,
|
|
void *aUserArg);
|
|
|
|
/**
|
|
* Returns true if the DOM has been modified since we started painting,
|
|
* in which case we should bail out and not paint anymore. This should
|
|
* never happen, but plugins can trigger it in some cases.
|
|
*/
|
|
bool CheckDOMModified();
|
|
|
|
/**
|
|
* The layer manager belonging to the widget that is being retained
|
|
* across paints.
|
|
*/
|
|
LayerManager* mRetainingManager;
|
|
/**
|
|
* The root prescontext for the display list builder reference frame
|
|
*/
|
|
nsRefPtr<nsRootPresContext> mRootPresContext;
|
|
|
|
/**
|
|
* The display list builder being used.
|
|
*/
|
|
nsDisplayListBuilder* mDisplayListBuilder;
|
|
/**
|
|
* A map from PaintedLayers to the list of display items (plus
|
|
* clipping data) to be rendered in the layer.
|
|
*/
|
|
nsTHashtable<PaintedLayerItemsEntry> mPaintedLayerItems;
|
|
|
|
/**
|
|
* When building layers for an inactive layer, this is where the
|
|
* inactive layer will be placed.
|
|
*/
|
|
PaintedLayerData* mContainingPaintedLayer;
|
|
|
|
ContainerState* mContainingContainerState;
|
|
|
|
/**
|
|
* Saved generation counter so we can detect DOM changes.
|
|
*/
|
|
uint32_t mInitialDOMGeneration;
|
|
/**
|
|
* Set to true if we have detected and reported DOM modification during
|
|
* the current paint.
|
|
*/
|
|
bool mDetectedDOMModification;
|
|
/**
|
|
* Indicates that the entire layer tree should be rerendered
|
|
* during this paint.
|
|
*/
|
|
bool mInvalidateAllLayers;
|
|
|
|
bool mInLayerTreeCompressionMode;
|
|
|
|
uint32_t mContainerLayerGeneration;
|
|
uint32_t mMaxContainerLayerGeneration;
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* FRAMELAYERBUILDER_H_ */
|