/* -*- 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 http://mozilla.org/MPL/2.0/. */

#include "TextureClientSharedSurface.h"

#include "GLContext.h"

#include "mozilla/gfx/2D.h"

#include "mozilla/gfx/Logging.h"        // for gfxDebug

#include "mozilla/layers/ISurfaceAllocator.h"

#include "mozilla/Unused.h"

#include "nsThreadUtils.h"

#include "SharedSurface.h"

using namespace mozilla::gl;

namespace mozilla {

namespace layers {

SharedSurfaceTextureData::SharedSurfaceTextureData(UniquePtr<gl::SharedSurface> surf)

  : mSurf(std::move(surf))

{}

SharedSurfaceTextureData::~SharedSurfaceTextureData()

{}

void

SharedSurfaceTextureData::Deallocate(LayersIPCChannel*)

{}

void

SharedSurfaceTextureData::FillInfo(TextureData::Info& aInfo) const

{

  aInfo.size = mSurf->mSize;

  aInfo.format = gfx::SurfaceFormat::UNKNOWN;

  aInfo.hasIntermediateBuffer = false;

  aInfo.hasSynchronization = false;

  aInfo.supportsMoz2D = false;

  aInfo.canExposeMappedData = false;

}

bool

SharedSurfaceTextureData::Serialize(SurfaceDescriptor& aOutDescriptor)

{

  return mSurf->ToSurfaceDescriptor(&aOutDescriptor);

}

SharedSurfaceTextureClient::SharedSurfaceTextureClient(SharedSurfaceTextureData* aData,

                                                       TextureFlags aFlags,

                                                       LayersIPCChannel* aAllocator)

: TextureClient(aData, aFlags, aAllocator)

{

  mWorkaroundAnnoyingSharedSurfaceLifetimeIssues = true;

}

already_AddRefed<SharedSurfaceTextureClient>

SharedSurfaceTextureClient::Create(UniquePtr<gl::SharedSurface> surf, gl::SurfaceFactory* factory,

                                   LayersIPCChannel* aAllocator, TextureFlags aFlags)

{

  if (!surf) {

    return nullptr;

  }

  TextureFlags flags = aFlags | TextureFlags::RECYCLE | surf->GetTextureFlags();

  SharedSurfaceTextureData* data = new SharedSurfaceTextureData(std::move(surf));

  return MakeAndAddRef<SharedSurfaceTextureClient>(data, flags, aAllocator);

}

SharedSurfaceTextureClient::~SharedSurfaceTextureClient()

{

  // XXX - Things break when using the proper destruction handshake with

  // SharedSurfaceTextureData because the TextureData outlives its gl

  // context. Having a strong reference to the gl context creates a cycle.

  // This needs to be fixed in a better way, though, because deleting

  // the TextureData here can race with the compositor and cause flashing.

  TextureData* data = mData;

  mData = nullptr;

  Destroy();

  if (data) {

    // Destroy mData right away without doing the proper deallocation handshake,

    // because SharedSurface depends on things that may not outlive the texture's

    // destructor so we can't wait until we know the compositor isn't using the

    // texture anymore.

    // It goes without saying that this is really bad and we should fix the bugs

    // that block doing the right thing such as bug 1224199 sooner rather than

    // later.

    delete data;

  }

}

} // namespace layers

} // namespace mozilla