AsyncImagePipelineOp.h

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/* 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_AsyncImagePipelineOp_H

#define MOZILLA_GFX_AsyncImagePipelineOp_H

#include <queue>

#include "mozilla/layers/TextureHost.h"

#include "mozilla/RefPtr.h"

#include "mozilla/webrender/webrender_ffi.h"

#include "Units.h"

namespace mozilla {

namespace wr {

struct Transaction;

}  // namespace wr

namespace layers {

class AsyncImagePipelineManager;

class TextureHost;

class AsyncImagePipelineOp {

 public:

  enum class Tag {

    ApplyAsyncImageForPipeline,

    RemoveAsyncImagePipeline,

};

  const Tag mTag;

  // Hold a strong reference: queued ops can outlive their owning

  // WebRenderBridgeParent and be processed after StopAndClearResources frees

  // the manager via a deferred remote-texture callback.

  const RefPtr<AsyncImagePipelineManager> mAsyncImageManager;

  const wr::PipelineId mPipelineId;

  const CompositableTextureHostRef mTextureHost;

  // Out-of-line so callers don't need the full AsyncImagePipelineManager type

  // to instantiate ~RefPtr<AsyncImagePipelineManager>.

  ~AsyncImagePipelineOp();

  AsyncImagePipelineOp(AsyncImagePipelineOp&&);

  AsyncImagePipelineOp(const AsyncImagePipelineOp&);

 private:

  AsyncImagePipelineOp(Tag aTag, AsyncImagePipelineManager* aAsyncImageManager,

                       const wr::PipelineId& aPipelineId,

                       TextureHost* aTextureHost);

  AsyncImagePipelineOp(Tag aTag, AsyncImagePipelineManager* aAsyncImageManager,

                       const wr::PipelineId& aPipelineId);

 public:

  static AsyncImagePipelineOp ApplyAsyncImageForPipeline(

      AsyncImagePipelineManager* aAsyncImageManager,

      const wr::PipelineId& aPipelineId, TextureHost* aTextureHost) {

    return AsyncImagePipelineOp(Tag::ApplyAsyncImageForPipeline,

                                aAsyncImageManager, aPipelineId, aTextureHost);

  static AsyncImagePipelineOp RemoveAsyncImagePipeline(

      AsyncImagePipelineManager* aAsyncImageManager,

      const wr::PipelineId& aPipelineId) {

    return AsyncImagePipelineOp(Tag::RemoveAsyncImagePipeline,

                                aAsyncImageManager, aPipelineId);

};

struct AsyncImagePipelineOps {

  explicit AsyncImagePipelineOps(wr::Transaction* aTransaction)

      : mTransaction(aTransaction) {}

  // Out-of-line so callers don't need the full AsyncImagePipelineManager type

  // to instantiate ~RefPtr<AsyncImagePipelineManager> for queued ops.

  ~AsyncImagePipelineOps();

  void HandleOps(wr::TransactionBuilder& aTxn);

  wr::Transaction* const mTransaction;

  std::queue<AsyncImagePipelineOp> mList;

};

}  // namespace layers

}  // namespace mozilla

#endif  // MOZILLA_GFX_AsyncImagePipelineOp_H