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133 lines
4.6 KiB
C++
133 lines
4.6 KiB
C++
/* 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFX_BASICIMPLDATA_H
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#define GFX_BASICIMPLDATA_H
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#include "Layers.h" // for Layer (ptr only), etc
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#include "gfxContext.h" // for gfxContext, etc
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#include "nsDebug.h" // for NS_ASSERTION
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#include "nsTraceRefcnt.h" // for MOZ_COUNT_CTOR, etc
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class gfxASurface;
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namespace mozilla {
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namespace layers {
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class ReadbackProcessor;
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class SurfaceDescriptor;
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/**
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* This is the ImplData for all Basic layers. It also exposes methods
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* private to the Basic implementation that are common to all Basic layer types.
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* In particular, there is an internal Paint() method that we can use
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* to paint the contents of non-Thebes layers.
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*
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* The class hierarchy for Basic layers is like this:
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* BasicImplData
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* Layer | | |
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* | | | |
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* +-> ContainerLayer | | |
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* | | | | |
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* | +-> BasicContainerLayer <--+ | |
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* | | |
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* +-> ThebesLayer | |
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* | | | |
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* | +-> BasicThebesLayer <---------+ |
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* | |
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* +-> ImageLayer |
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* | |
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* +-> BasicImageLayer <--------------+
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*/
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class BasicImplData {
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public:
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BasicImplData() : mHidden(false),
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mClipToVisibleRegion(false),
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mDrawAtomically(false),
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mOperator(gfxContext::OPERATOR_OVER)
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{
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MOZ_COUNT_CTOR(BasicImplData);
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}
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virtual ~BasicImplData()
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{
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MOZ_COUNT_DTOR(BasicImplData);
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}
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/**
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* Layers that paint themselves, such as ImageLayers, should paint
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* in response to this method call. aContext will already have been
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* set up to account for all the properties of the layer (transform,
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* opacity, etc).
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*/
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virtual void Paint(gfxContext* aContext, Layer* aMaskLayer) {}
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/**
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* Like Paint() but called for ThebesLayers with the additional parameters
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* they need.
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* If mClipToVisibleRegion is set, then the layer must clip to its
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* effective visible region (snapped or unsnapped, it doesn't matter).
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*/
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virtual void PaintThebes(gfxContext* aContext,
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Layer* aMasklayer,
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LayerManager::DrawThebesLayerCallback aCallback,
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void* aCallbackData,
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ReadbackProcessor* aReadback) {}
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virtual void Validate(LayerManager::DrawThebesLayerCallback aCallback,
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void* aCallbackData) {}
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/**
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* Layers will get this call when their layer manager is destroyed, this
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* indicates they should clear resources they don't really need after their
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* LayerManager ceases to exist.
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*/
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virtual void ClearCachedResources() {}
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/**
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* This variable is set by MarkLayersHidden() before painting. It indicates
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* that the layer should not be composited during this transaction.
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*/
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void SetHidden(bool aCovered) { mHidden = aCovered; }
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bool IsHidden() const { return false; }
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/**
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* This variable is set by MarkLayersHidden() before painting. This is
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* the operator to be used when compositing the layer in this transaction. It must
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* be OVER or SOURCE.
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*/
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void SetOperator(gfxContext::GraphicsOperator aOperator)
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{
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NS_ASSERTION(aOperator == gfxContext::OPERATOR_OVER ||
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aOperator == gfxContext::OPERATOR_SOURCE,
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"Bad composition operator");
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mOperator = aOperator;
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}
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gfxContext::GraphicsOperator GetOperator() const { return mOperator; }
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/**
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* Return a surface for this layer. Will use an existing surface, if
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* possible, or may create a temporary surface. Implement this
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* method for any layers that might be used as a mask. Should only
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* return false if a surface cannot be created. If true is
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* returned, only one of |aSurface| or |aDescriptor| is valid.
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*/
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virtual bool GetAsSurface(gfxASurface** aSurface,
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SurfaceDescriptor* aDescriptor)
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{ return false; }
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bool GetClipToVisibleRegion() { return mClipToVisibleRegion; }
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void SetClipToVisibleRegion(bool aClip) { mClipToVisibleRegion = aClip; }
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void SetDrawAtomically(bool aDrawAtomically) { mDrawAtomically = aDrawAtomically; }
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protected:
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bool mHidden;
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bool mClipToVisibleRegion;
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bool mDrawAtomically;
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gfxContext::GraphicsOperator mOperator;
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};
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} // layers
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} // mozilla
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#endif
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