gecko/gfx/layers/client/ClientTiledThebesLayer.h

129 lines
4.2 KiB
C++

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFX_CLIENTTILEDTHEBESLAYER_H
#define GFX_CLIENTTILEDTHEBESLAYER_H
#include "ClientLayerManager.h" // for ClientLayer, etc
#include "Layers.h" // for ThebesLayer, etc
#include "mozilla/RefPtr.h" // for RefPtr
#include "mozilla/layers/TiledContentClient.h"
#include "nsDebug.h" // for NS_RUNTIMEABORT
#include "nsRegion.h" // for nsIntRegion
class gfxContext;
namespace mozilla {
namespace layers {
class ShadowableLayer;
class SpecificLayerAttributes;
/**
* An implementation of ThebesLayer that ONLY supports remote
* composition that is backed by tiles. This thebes layer implementation
* is better suited to mobile hardware to work around slow implementation
* of glTexImage2D (for OGL compositors), and restrait memory bandwidth.
*
* Tiled Thebes layers use a different protocol compared with other
* layers. A copy of the tiled buffer is made and sent to the compositing
* thread via the layers protocol. Tiles are uploaded by the buffers
* asynchonously without using IPC, that means they are not safe for cross-
* process use (bug 747811). Each tile has a TextureHost/Client pair but
* they communicate directly rather than using the Texture protocol.
*
* There is no ContentClient for tiled layers. There is a ContentHost, however.
*/
class ClientTiledThebesLayer : public ThebesLayer,
public ClientLayer
{
typedef ThebesLayer Base;
public:
ClientTiledThebesLayer(ClientLayerManager* const aManager,
ClientLayerManager::ThebesLayerCreationHint aCreationHint = LayerManager::NONE);
~ClientTiledThebesLayer();
// Override name to distinguish it from ClientThebesLayer in layer dumps
virtual const char* Name() const { return "TiledThebesLayer"; }
// Thebes Layer
virtual Layer* AsLayer() { return this; }
virtual void InvalidateRegion(const nsIntRegion& aRegion) {
mInvalidRegion.Or(mInvalidRegion, aRegion);
mValidRegion.Sub(mValidRegion, aRegion);
mLowPrecisionValidRegion.Sub(mLowPrecisionValidRegion, aRegion);
}
// Shadow methods
virtual void FillSpecificAttributes(SpecificLayerAttributes& aAttrs);
virtual ShadowableLayer* AsShadowableLayer() { return this; }
virtual void Disconnect()
{
ClientLayer::Disconnect();
}
virtual void RenderLayer();
virtual void ClearCachedResources() MOZ_OVERRIDE;
/**
* Helper method to find the nearest ancestor layers which
* scroll and have a displayport. The parameters are out-params
* which hold the return values; the values passed in may be null.
*/
void GetAncestorLayers(ContainerLayer** aOutScrollAncestor,
ContainerLayer** aOutDisplayPortAncestor);
private:
ClientLayerManager* ClientManager()
{
return static_cast<ClientLayerManager*>(mManager);
}
/**
* For the initial PaintThebes of a transaction, calculates all the data
* needed for that paint and any repeated transactions.
*/
void BeginPaint();
/**
* Determine if we can use a fast path to just do a single high-precision,
* non-progressive paint.
*/
bool UseFastPath();
/**
* Helper function to do the high-precision paint.
* This function returns true if it updated the paint buffer.
*/
bool RenderHighPrecision(nsIntRegion& aInvalidRegion,
LayerManager::DrawThebesLayerCallback aCallback,
void* aCallbackData);
/**
* Helper function to do the low-precision paint.
* This function returns true if it updated the paint buffer.
*/
bool RenderLowPrecision(nsIntRegion& aInvalidRegion,
LayerManager::DrawThebesLayerCallback aCallback,
void* aCallbackData);
/**
* This causes the paint to be marked as finished, and updates any data
* necessary to persist until the next paint.
*/
void EndPaint();
RefPtr<TiledContentClient> mContentClient;
nsIntRegion mLowPrecisionValidRegion;
BasicTiledLayerPaintData mPaintData;
};
} // layers
} // mozilla
#endif