gecko-dev/gfx/vr/VRDisplayPresentation.cpp

148 строки
4.2 KiB
C++

/* -*- 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 "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();
}
void
VRDisplayPresentation::UpdateLayers(const nsTArray<mozilla::dom::VRLayer>& aLayers)
{
mDOMLayers = aLayers;
CreateLayers();
}
uint32_t
VRDisplayPresentation::GetGroup() const
{
return mGroup;
}
void
VRDisplayPresentation::CreateLayers()
{
VRManagerChild *manager = VRManagerChild::Get();
if (!manager) {
// This should not happen, but let's log it and avoid a crash in case
// of regression.
NS_WARNING("VRManagerChild::Get returned null!");
return;
}
unsigned int iLayer=0;
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.SetRect(layer.mLeftBounds[0],
layer.mLeftBounds[1],
layer.mLeftBounds[2],
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.SetRect(layer.mRightBounds[0],
layer.mRightBounds[1],
layer.mRightBounds[2],
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;
}
nsCOMPtr<nsIEventTarget> target;
nsIDocument* doc;
doc = canvasElement->OwnerDoc();
if (doc) {
target = doc->EventTargetFor(TaskCategory::Other);
}
if (mLayers.Length() <= iLayer) {
// Not enough layers, let's add one
RefPtr<VRLayerChild> vrLayer =
static_cast<VRLayerChild*>(manager->CreateVRLayer(mDisplayClient->GetDisplayInfo().GetDisplayID(),
target, mGroup));
if (!vrLayer) {
NS_WARNING("CreateVRLayer returned null!");
continue;
}
vrLayer->Initialize(canvasElement, leftBounds, rightBounds);
mLayers.AppendElement(vrLayer);
} else {
// We already have a layer, let's update it
mLayers[iLayer]->Initialize(canvasElement, leftBounds, rightBounds);
}
iLayer++;
}
// Truncate any excess layers that weren't included in the updated list
mLayers.SetLength(iLayer);
}
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(mDisplayClient->GetDisplayInfo().GetFrameId());
break; // Currently only one layer supported, submit only the first
}
}