1 files changed, 112 insertions, 0 deletions
diff --git a/gfx/vr/VRDisplayPresentation.cpp b/gfx/vr/VRDisplayPresentation.cpp
new file mode 100644
index 000000000..ba528ae7c
--- /dev/null
+++ b/gfx/vr/VRDisplayPresentation.cpp
@@ -0,0 +1,112 @@
+/* -*- 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/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)
+  : mDisplayClient(aDisplayClient)
+  , mDOMLayers(aLayers)
+{
+  CreateLayers();
+}
+
+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.width = layer.mLeftBounds[2];
+      leftBounds.height = 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.width = layer.mRightBounds[2];
+      rightBounds.height = 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;
+    }
+
+    RefPtr<VRLayerChild> vrLayer = static_cast<VRLayerChild*>(manager->CreateVRLayer(mDisplayClient->GetDisplayInfo().GetDisplayID(), leftBounds, rightBounds));
+    if (!vrLayer) {
+      NS_WARNING("CreateVRLayer returned null!");
+      continue;
+    }
+
+    vrLayer->Initialize(canvasElement);
+
+    mLayers.AppendElement(vrLayer);
+  }
+}
+
+void
+VRDisplayPresentation::DestroyLayers()
+{
+  for (VRLayerChild* layer : mLayers) {
+    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
+  }
+}