gecko/content/media/VideoFrameContainer.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 "VideoFrameContainer.h"
#include "nsHTMLMediaElement.h"
#include "nsIFrame.h"
#include "nsDisplayList.h"
#include "nsSVGEffects.h"
#include "ImageContainer.h"
using namespace mozilla::layers;
namespace mozilla {
VideoFrameContainer::VideoFrameContainer(nsHTMLMediaElement* aElement,
already_AddRefed<ImageContainer> aContainer)
: mElement(aElement),
mImageContainer(aContainer), mMutex("nsVideoFrameContainer"),
mIntrinsicSizeChanged(false), mImageSizeChanged(false),
mNeedInvalidation(true)
{
NS_ASSERTION(aElement, "aElement must not be null");
NS_ASSERTION(mImageContainer, "aContainer must not be null");
}
VideoFrameContainer::~VideoFrameContainer()
{}
void VideoFrameContainer::SetCurrentFrame(const gfxIntSize& aIntrinsicSize,
Image* aImage,
TimeStamp aTargetTime)
{
MutexAutoLock lock(mMutex);
if (aIntrinsicSize != mIntrinsicSize) {
mIntrinsicSize = aIntrinsicSize;
mIntrinsicSizeChanged = true;
}
gfxIntSize oldFrameSize = mImageContainer->GetCurrentSize();
TimeStamp lastPaintTime = mImageContainer->GetPaintTime();
if (!lastPaintTime.IsNull() && !mPaintTarget.IsNull()) {
mPaintDelay = lastPaintTime - mPaintTarget;
}
// When using the OMX decoder, destruction of the current image can indirectly
// block on main thread I/O. If we let this happen while holding onto
// |mImageContainer|'s lock, then when the main thread then tries to
// composite it can then block on |mImageContainer|'s lock, causing a
// deadlock. We use this hack to defer the destruction of the current image
// until it is safe.
nsRefPtr<Image> kungFuDeathGrip;
kungFuDeathGrip = mImageContainer->LockCurrentImage();
mImageContainer->UnlockCurrentImage();
mImageContainer->SetCurrentImage(aImage);
gfxIntSize newFrameSize = mImageContainer->GetCurrentSize();
if (oldFrameSize != newFrameSize) {
mImageSizeChanged = true;
}
mPaintTarget = aTargetTime;
}
void VideoFrameContainer::ClearCurrentFrame()
{
MutexAutoLock lock(mMutex);
// See comment in SetCurrentFrame for the reasoning behind
// using a kungFuDeathGrip here.
nsRefPtr<Image> kungFuDeathGrip;
kungFuDeathGrip = mImageContainer->LockCurrentImage();
mImageContainer->UnlockCurrentImage();
mImageContainer->SetCurrentImage(nullptr);
}
ImageContainer* VideoFrameContainer::GetImageContainer() {
return mImageContainer;
}
double VideoFrameContainer::GetFrameDelay()
{
MutexAutoLock lock(mMutex);
return mPaintDelay.ToSeconds();
}
void VideoFrameContainer::Invalidate()
{
NS_ASSERTION(NS_IsMainThread(), "Must call on main thread");
if (!mNeedInvalidation) {
return;
}
if (mImageContainer && mImageContainer->IsAsync()) {
mNeedInvalidation = false;
}
if (!mElement) {
// Element has been destroyed
return;
}
nsIFrame* frame = mElement->GetPrimaryFrame();
bool invalidateFrame = false;
{
MutexAutoLock lock(mMutex);
// Get mImageContainerSizeChanged while holding the lock.
invalidateFrame = mImageSizeChanged;
mImageSizeChanged = false;
if (mIntrinsicSizeChanged) {
mElement->UpdateMediaSize(mIntrinsicSize);
mIntrinsicSizeChanged = false;
if (frame) {
nsPresContext* presContext = frame->PresContext();
nsIPresShell *presShell = presContext->PresShell();
presShell->FrameNeedsReflow(frame,
nsIPresShell::eStyleChange,
NS_FRAME_IS_DIRTY);
}
}
}
if (frame) {
nsRect contentRect = frame->GetContentRect() - frame->GetPosition();
if (invalidateFrame) {
frame->Invalidate(contentRect);
} else {
frame->InvalidateLayer(contentRect, nsDisplayItem::TYPE_VIDEO);
}
}
nsSVGEffects::InvalidateDirectRenderingObservers(mElement);
}
}