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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 */
#include <stdint.h> // for uint32_t, uint64_t
#include <sys/types.h> // for int32_t
#include "mozilla/Attributes.h" // for override
#include "mozilla/RefPtr.h" // for RefPtr, already_AddRefed
#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 mozilla::gfx::IntRect
namespace mozilla {
namespace layers {
class CompositableForwarder;
class Image;
class ImageContainer;
class ImageClientSingle;
* 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 {
* 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 already_AddRefed<ImageClient> CreateImageClient(
CompositableType aImageHostType, CompositableForwarder* aFwd,
TextureFlags aFlags);
virtual ~ImageClient() = default;
* 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;
* asynchronously remove all the textures used by the image client.
virtual void FlushAllImages() {}
virtual void RemoveTexture(TextureClient* aTexture) override;
virtual ImageClientSingle* AsImageClientSingle() { return nullptr; }
static already_AddRefed<TextureClient> CreateTextureClientForImage(
Image* aImage, KnowsCompositor* aForwarder);
uint32_t GetLastUpdateGenerationCounter() {
return mLastUpdateGenerationCounter;
virtual RefPtr<TextureClient> GetForwardedTexture() { return nullptr; }
ImageClient(CompositableForwarder* aFwd, TextureFlags aFlags,
CompositableType aType);
CompositableType mType;
uint32_t mLastUpdateGenerationCounter;
* An image client which uses a single texture client.
class ImageClientSingle : public ImageClient {
ImageClientSingle(CompositableForwarder* aFwd, TextureFlags aFlags,
CompositableType aType);
bool UpdateImage(ImageContainer* aContainer, uint32_t aContentFlag) override;
void OnDetach() override;
bool AddTextureClient(TextureClient* aTexture) override;
TextureInfo GetTextureInfo() const override;
void FlushAllImages() override;
ImageClientSingle* AsImageClientSingle() override { return this; }
RefPtr<TextureClient> GetForwardedTexture() override;
bool IsEmpty() { return mBuffers.IsEmpty(); }
struct Buffer {
RefPtr<TextureClient> mTextureClient;
int32_t mImageSerial;
nsTArray<Buffer> mBuffers;
} // namespace layers
} // namespace mozilla