gecko-dev/gfx/ipc/CompositorOptions.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=99: */
/* 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 _include_mozilla_gfx_ipc_CompositorOptions_h_
#define _include_mozilla_gfx_ipc_CompositorOptions_h_

namespace IPC {
template <typename> struct ParamTraits;
} // namespace IPC

namespace mozilla {
namespace layers {

/**
 * This class holds options that are "per compositor" - that is, these options
 * affect a particular CompositorBridgeParent and all the content that it
 * renders.
 *
 * This class is intended to be created by a platform widget (but NOT
 * PuppetWidget) and passed to the graphics code during initialization of the
 * top level compositor associated with that widget. The options are immutable
 * after creation. The CompositorBridgeParent holds the canonical version of
 * the options, but they may be accessed by other parts of the code as needed,
 * and are accessible to content processes over PCompositorBridge as well.
 */
class CompositorOptions
{
public:
  // This constructor needed for IPDL purposes, don't use it anywhere else.
  CompositorOptions()
    : mUseAPZ(false)
    , mUseWebRender(false)
    , mUseAdvancedLayers(false)
  {
  }

  explicit CompositorOptions(bool aUseAPZ,
                             bool aUseWebRender)
    : mUseAPZ(aUseAPZ)
    , mUseWebRender(aUseWebRender)
    , mUseAdvancedLayers(false)
  {
  }

  bool UseAPZ() const { return mUseAPZ; }
  bool UseWebRender() const { return mUseWebRender; }
  bool UseAdvancedLayers() const { return mUseAdvancedLayers; }

  void SetUseAdvancedLayers(bool aUseAdvancedLayers) {
    mUseAdvancedLayers = aUseAdvancedLayers;
  }

  bool operator==(const CompositorOptions& aOther) const {
    return mUseAPZ == aOther.mUseAPZ &&
           mUseWebRender == aOther.mUseWebRender;
  }

  friend struct IPC::ParamTraits<CompositorOptions>;

private:
  bool mUseAPZ;
  bool mUseWebRender;
  bool mUseAdvancedLayers;

  // Make sure to add new fields to the ParamTraits implementation
};

} // namespace layers
} // namespace mozilla

#endif // _include_mozilla_gfx_ipc_CompositorOptions_h_