gfx/vr/VRDisplayPresentation.cpp
author Ryan VanderMeulen <ryanvm@gmail.com>
Fri, 01 Sep 2017 15:37:08 -0400
changeset 430269 1d02aa80f2f8c283428f0a8a6310e7d1fec3936c
parent 426549 2a8f664f107efeaa3be4dee08b3ac340df88892f
child 432376 7d20f9d48e02e895bc022eaa20b788f351db9463
permissions -rw-r--r--
Backed out 9 changesets (bug 1383880) for decision task bustage. Backed out changeset 53f5d47a7cb0 (bug 1383880) Backed out changeset a0abda41172a (bug 1383880) Backed out changeset 729a7e2091e8 (bug 1383880) Backed out changeset a33f5a14a471 (bug 1383880) Backed out changeset 5b10d321cfee (bug 1383880) Backed out changeset 8056488d8aed (bug 1383880) Backed out changeset e62c90e3c1e8 (bug 1383880) Backed out changeset 91f116ce6c2a (bug 1383880) Backed out changeset 045498bc36c4 (bug 1383880)

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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 "VRDisplayPresentation.h"

#include "mozilla/dom/DocGroup.h"
#include "mozilla/Unused.h"
#include "VRDisplayClient.h"
#include "VRLayerChild.h"

using namespace mozilla;
using namespace mozilla::gfx;

VRDisplayPresentation::VRDisplayPresentation(VRDisplayClient *aDisplayClient,
                                             const nsTArray<mozilla::dom::VRLayer>& aLayers,
                                             uint32_t aGroup)
  : mDisplayClient(aDisplayClient)
  , mDOMLayers(aLayers)
  , mGroup(aGroup)
{
  CreateLayers();
}

uint32_t
VRDisplayPresentation::GetGroup() const
{
  return mGroup;
}

void
VRDisplayPresentation::CreateLayers()
{
  if (mLayers.Length()) {
    return;
  }

  for (dom::VRLayer& layer : mDOMLayers) {
    dom::HTMLCanvasElement* canvasElement = layer.mSource;
    if (!canvasElement) {
      /// XXX In the future we will support WebVR in WebWorkers here
      continue;
    }

    Rect leftBounds(0.0, 0.0, 0.5, 1.0);
    if (layer.mLeftBounds.Length() == 4) {
      leftBounds.x = layer.mLeftBounds[0];
      leftBounds.y = layer.mLeftBounds[1];
      leftBounds.SetWidth(layer.mLeftBounds[2]);
      leftBounds.SetHeight(layer.mLeftBounds[3]);
    } else if (layer.mLeftBounds.Length() != 0) {
      /**
       * We ignore layers with an incorrect number of values.
       * In the future, VRDisplay.requestPresent may throw in
       * this case.  See https://github.com/w3c/webvr/issues/71
       */
      continue;
    }

    Rect rightBounds(0.5, 0.0, 0.5, 1.0);
    if (layer.mRightBounds.Length() == 4) {
      rightBounds.x = layer.mRightBounds[0];
      rightBounds.y = layer.mRightBounds[1];
      rightBounds.SetWidth(layer.mRightBounds[2]);
      rightBounds.SetHeight(layer.mRightBounds[3]);
    } else if (layer.mRightBounds.Length() != 0) {
      /**
       * We ignore layers with an incorrect number of values.
       * In the future, VRDisplay.requestPresent may throw in
       * this case.  See https://github.com/w3c/webvr/issues/71
       */
      continue;
    }

    VRManagerChild *manager = VRManagerChild::Get();
    if (!manager) {
      NS_WARNING("VRManagerChild::Get returned null!");
      continue;
    }

    nsCOMPtr<nsIEventTarget> target;
    nsIDocument* doc;
    doc = canvasElement->OwnerDoc();
    if (doc) {
      target = doc->EventTargetFor(TaskCategory::Other);
    }

    RefPtr<VRLayerChild> vrLayer =
      static_cast<VRLayerChild*>(manager->CreateVRLayer(mDisplayClient->GetDisplayInfo().GetDisplayID(),
                                                        leftBounds, rightBounds, target,
                                                        mGroup));
    if (!vrLayer) {
      NS_WARNING("CreateVRLayer returned null!");
      continue;
    }

    vrLayer->Initialize(canvasElement);

    mLayers.AppendElement(vrLayer);
  }
}

void
VRDisplayPresentation::DestroyLayers()
{
  for (VRLayerChild* layer : mLayers) {
    if (layer->IsIPCOpen()) {
      Unused << layer->SendDestroy();
    }
  }
  mLayers.Clear();
}

void
VRDisplayPresentation::GetDOMLayers(nsTArray<dom::VRLayer>& result)
{
  result = mDOMLayers;
}

VRDisplayPresentation::~VRDisplayPresentation()
{
  DestroyLayers();
  mDisplayClient->PresentationDestroyed();
}

void VRDisplayPresentation::SubmitFrame()
{
  for (VRLayerChild *layer : mLayers) {
    layer->SubmitFrame();
    break; // Currently only one layer supported, submit only the first
  }
}