зеркало из https://github.com/mozilla/pjs.git
94 строки
3.7 KiB
C++
94 строки
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef VIDEOFRAMECONTAINER_H_
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#define VIDEOFRAMECONTAINER_H_
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#include "ImageLayers.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/TimeStamp.h"
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#include "nsISupportsImpl.h"
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#include "gfxPoint.h"
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class nsHTMLMediaElement;
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namespace mozilla {
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/**
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* This object is used in the decoder backend threads and the main thread
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* to manage the "current video frame" state. This state includes timing data
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* and an intrinsic size (see below).
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* This has to be a thread-safe object since it's accessed by resource decoders
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* and other off-main-thread components. So we can't put this state in the media
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* element itself ... well, maybe we could, but it could be risky and/or
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* confusing.
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*/
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class VideoFrameContainer {
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public:
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typedef mozilla::layers::ImageContainer ImageContainer;
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typedef mozilla::layers::Image Image;
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VideoFrameContainer)
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VideoFrameContainer(nsHTMLMediaElement* aElement,
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already_AddRefed<ImageContainer> aContainer)
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: mElement(aElement),
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mImageContainer(aContainer), mMutex("nsVideoFrameContainer"),
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mIntrinsicSizeChanged(false), mImageSizeChanged(false)
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{
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NS_ASSERTION(aElement, "aElement must not be null");
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NS_ASSERTION(mImageContainer, "aContainer must not be null");
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}
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// Call on any thread
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void SetCurrentFrame(const gfxIntSize& aIntrinsicSize, Image* aImage,
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TimeStamp aTargetTime);
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// Time in seconds by which the last painted video frame was late by.
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// E.g. if the last painted frame should have been painted at time t,
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// but was actually painted at t+n, this returns n in seconds. Threadsafe.
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double GetFrameDelay();
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// Call on main thread
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void Invalidate();
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ImageContainer* GetImageContainer() { return mImageContainer; }
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void ForgetElement() { mElement = nsnull; }
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protected:
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// Non-addreffed pointer to the element. The element calls ForgetElement
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// to clear this reference when the element is destroyed.
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nsHTMLMediaElement* mElement;
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nsRefPtr<ImageContainer> mImageContainer;
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// mMutex protects all the fields below.
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Mutex mMutex;
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// The intrinsic size is the ideal size which we should render the
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// ImageContainer's current Image at.
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// This can differ from the Image's actual size when the media resource
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// specifies that the Image should be stretched to have the correct aspect
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// ratio.
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gfxIntSize mIntrinsicSize;
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// The time at which the current video frame should have been painted.
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// Access protected by mVideoUpdateLock.
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TimeStamp mPaintTarget;
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// The delay between the last video frame being presented and it being
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// painted. This is time elapsed after mPaintTarget until the most recently
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// painted frame appeared on screen.
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TimeDuration mPaintDelay;
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// True when the intrinsic size has been changed by SetCurrentFrame() since
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// the last call to Invalidate().
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// The next call to Invalidate() will recalculate
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// and update the intrinsic size on the element, request a frame reflow and
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// then reset this flag.
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bool mIntrinsicSizeChanged;
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// True when the Image size has changed since the last time Invalidate() was
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// called. When set, the next call to Invalidate() will ensure that the
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// frame is fully invalidated instead of just invalidating for the image change
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// in the ImageLayer.
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bool mImageSizeChanged;
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};
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}
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#endif /* VIDEOFRAMECONTAINER_H_ */
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