gecko-dev/gfx/layers/client/ImageClient.h

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef MOZILLA_GFX_IMAGECLIENT_H
#define MOZILLA_GFX_IMAGECLIENT_H
#include <stdint.h> // for uint32_t, uint64_t
#include <sys/types.h> // for int32_t
#include "mozilla/Attributes.h" // for MOZ_OVERRIDE
#include "mozilla/RefPtr.h" // for RefPtr, TemporaryRef
#include "mozilla/gfx/Types.h" // for SurfaceFormat
#include "mozilla/layers/CompositableClient.h" // for CompositableClient
#include "mozilla/layers/CompositorTypes.h" // for CompositableType, etc
#include "mozilla/layers/LayersSurfaces.h" // for SurfaceDescriptor
#include "mozilla/layers/TextureClient.h" // for TextureClient, etc
#include "mozilla/mozalloc.h" // for operator delete
#include "nsCOMPtr.h" // for already_AddRefed
#include "nsRect.h" // for nsIntRect
namespace mozilla {
namespace layers {
class CompositableForwarder;
class Image;
class ImageContainer;
class ShadowableLayer;
/**
* Image clients are used by basic image layers on the content thread, they
* always match with an ImageHost on the compositor thread. See
* CompositableClient.h for information on connecting clients to hosts.
*/
class ImageClient : public CompositableClient
{
public:
/**
* Creates, configures, and returns a new image client. If necessary, a
* message will be sent to the compositor to create a corresponding image
* host.
*/
static TemporaryRef<ImageClient> CreateImageClient(CompositableType aImageHostType,
CompositableForwarder* aFwd,
TextureFlags aFlags);
virtual ~ImageClient() {}
/**
* Update this ImageClient from aContainer in aLayer
* returns false if this is the wrong kind of ImageClient for aContainer.
* Note that returning true does not necessarily imply success
*/
virtual bool UpdateImage(ImageContainer* aContainer, uint32_t aContentFlags) = 0;
/**
* The picture rect is the area of the texture which makes up the image. That
* is, the area that should be composited. In texture space.
*/
virtual void UpdatePictureRect(nsIntRect aPictureRect);
virtual already_AddRefed<Image> CreateImage(ImageFormat aFormat) = 0;
/**
* Synchronously remove all the textures used by the image client.
*/
virtual void FlushAllImages(bool aExceptFront) {}
protected:
ImageClient(CompositableForwarder* aFwd, TextureFlags aFlags,
CompositableType aType);
CompositableType mType;
int32_t mLastPaintedImageSerial;
nsIntRect mPictureRect;
};
/**
* An image client which uses a single texture client.
*/
class ImageClientSingle : public ImageClient
{
public:
ImageClientSingle(CompositableForwarder* aFwd,
TextureFlags aFlags,
CompositableType aType);
virtual bool UpdateImage(ImageContainer* aContainer, uint32_t aContentFlags);
virtual void OnDetach() MOZ_OVERRIDE;
virtual bool AddTextureClient(TextureClient* aTexture) MOZ_OVERRIDE;
virtual TextureInfo GetTextureInfo() const MOZ_OVERRIDE;
virtual already_AddRefed<Image> CreateImage(ImageFormat aFormat) MOZ_OVERRIDE;
virtual void FlushAllImages(bool aExceptFront) MOZ_OVERRIDE;
protected:
virtual bool UpdateImageInternal(ImageContainer* aContainer, uint32_t aContentFlags, bool* aIsSwapped);
protected:
RefPtr<TextureClient> mFrontBuffer;
};
/**
* An image client which uses two texture clients.
*/
class ImageClientBuffered : public ImageClientSingle
{
public:
ImageClientBuffered(CompositableForwarder* aFwd,
TextureFlags aFlags,
CompositableType aType);
virtual bool UpdateImage(ImageContainer* aContainer, uint32_t aContentFlags);
virtual void OnDetach() MOZ_OVERRIDE;
virtual void FlushAllImages(bool aExceptFront) MOZ_OVERRIDE;
protected:
RefPtr<TextureClient> mBackBuffer;
};
/**
* Image class to be used for async image uploads using the image bridge
* protocol.
* We store the ImageBridge id in the TextureClientIdentifier.
*/
class ImageClientBridge : public ImageClient
{
public:
ImageClientBridge(CompositableForwarder* aFwd,
TextureFlags aFlags);
virtual bool UpdateImage(ImageContainer* aContainer, uint32_t aContentFlags);
virtual bool Connect() { return false; }
virtual void Updated() {}
void SetLayer(ShadowableLayer* aLayer)
{
mLayer = aLayer;
}
virtual TextureInfo GetTextureInfo() const MOZ_OVERRIDE
{
return TextureInfo(mType);
}
virtual void SetIPDLActor(CompositableChild* aChild) MOZ_OVERRIDE
{
MOZ_ASSERT(!aChild, "ImageClientBridge should not have IPDL actor");
}
virtual already_AddRefed<Image> CreateImage(ImageFormat aFormat) MOZ_OVERRIDE
{
NS_WARNING("Should not create an image through an ImageClientBridge");
return nullptr;
}
protected:
uint64_t mAsyncContainerID;
ShadowableLayer* mLayer;
};
}
}
#endif