/* -*- 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/. */
#include "GPUChild.h"
#include "gfxPrefs.h"
#include "GPUProcessHost.h"
#include "mozilla/gfx/gfxVars.h"

namespace mozilla {
namespace gfx {

GPUChild::GPUChild(GPUProcessHost* aHost)
 : mHost(aHost)
{
  MOZ_COUNT_CTOR(GPUChild);
}

GPUChild::~GPUChild()
{
  MOZ_COUNT_DTOR(GPUChild);
}

void
GPUChild::Init()
{
  // Build a list of prefs the GPU process will need. Note that because we
  // limit the GPU process to prefs contained in gfxPrefs, we can simplify
  // the message in two ways: one, we only need to send its index in gfxPrefs
  // rather than its name, and two, we only need to send prefs that don't
  // have their default value.
  nsTArray<GfxPrefSetting> prefs;
  for (auto pref : gfxPrefs::all()) {
    if (pref->HasDefaultValue()) {
      continue;
    }

    GfxPrefValue value;
    pref->GetCachedValue(&value);
    prefs.AppendElement(GfxPrefSetting(pref->Index(), value));
  }

  nsTArray<GfxVarUpdate> updates = gfxVars::FetchNonDefaultVars();
  SendInit(prefs, updates);

  gfxVars::AddReceiver(this);
}

void
GPUChild::OnVarChanged(const GfxVarUpdate& aVar)
{
  SendUpdateVar(aVar);
}

void
GPUChild::ActorDestroy(ActorDestroyReason aWhy)
{
  gfxVars::RemoveReceiver(this);
  mHost->OnChannelClosed();
}

class DeferredDeleteGPUChild : public Runnable
{
public:
  explicit DeferredDeleteGPUChild(UniquePtr<GPUChild>&& aChild)
    : mChild(Move(aChild))
  {
  }

  NS_IMETHODIMP Run() override {
    return NS_OK;
  }

private:
  UniquePtr<GPUChild> mChild;
};

/* static */ void
GPUChild::Destroy(UniquePtr<GPUChild>&& aChild)
{
  NS_DispatchToMainThread(new DeferredDeleteGPUChild(Move(aChild)));
}

} // namespace gfx
} // namespace mozilla