зеркало из https://github.com/mozilla/gecko-dev.git
140 строки
4.6 KiB
C++
140 строки
4.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_GFX_IMAGECOMPOSITE_H
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#define MOZILLA_GFX_IMAGECOMPOSITE_H
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#include "CompositableHost.h" // for CompositableTextureHostRef
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#include "mozilla/gfx/2D.h"
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#include "mozilla/TimeStamp.h" // for TimeStamp
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#include "nsTArray.h"
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namespace mozilla {
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namespace layers {
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/**
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* Implements Image selection logic.
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*/
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class ImageComposite {
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public:
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static const float BIAS_TIME_MS;
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explicit ImageComposite();
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virtual ~ImageComposite();
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int32_t GetFrameID() {
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const TimedImage* img = ChooseImage();
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return img ? img->mFrameID : -1;
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}
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int32_t GetProducerID() {
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const TimedImage* img = ChooseImage();
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return img ? img->mProducerID : -1;
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}
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int32_t GetLastFrameID() const { return mLastFrameID; }
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int32_t GetLastProducerID() const { return mLastProducerID; }
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uint32_t GetDroppedFramesAndReset() {
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uint32_t dropped = mDroppedFrames;
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mDroppedFrames = 0;
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return dropped;
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}
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enum Bias {
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// Don't apply bias to frame times
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BIAS_NONE,
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// Apply a negative bias to frame times to keep them before the vsync time
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BIAS_NEGATIVE,
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// Apply a positive bias to frame times to keep them after the vsync time
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BIAS_POSITIVE,
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};
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protected:
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virtual TimeStamp GetCompositionTime() const = 0;
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virtual CompositionOpportunityId GetCompositionOpportunityId() const = 0;
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virtual void AppendImageCompositeNotification(
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const ImageCompositeNotificationInfo& aInfo) const = 0;
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struct TimedImage {
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CompositableTextureHostRef mTextureHost;
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TimeStamp mTimeStamp;
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gfx::IntRect mPictureRect;
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int32_t mFrameID;
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int32_t mProducerID;
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};
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/**
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* ChooseImage is guaranteed to return the same TimedImage every time it's
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* called during the same composition, up to the end of Composite() ---
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* it depends only on mImages, mCompositor->GetCompositionTime(), and mBias.
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* mBias is updated at the end of Composite().
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*/
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const TimedImage* ChooseImage();
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int ChooseImageIndex();
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const TimedImage* GetImage(size_t aIndex) const;
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size_t ImagesCount() const { return mImages.Length(); }
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const nsTArray<TimedImage>& Images() const { return mImages; }
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void RemoveImagesWithTextureHost(TextureHost* aTexture);
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void ClearImages();
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void SetImages(nsTArray<TimedImage>&& aNewImages);
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protected:
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// Send ImageComposite notifications and update the ChooseImage bias.
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void OnFinishRendering(int aImageIndex, const TimedImage* aImage,
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base::ProcessId aProcessId,
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const CompositableHandle& aHandle);
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int32_t mLastFrameID = -1;
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int32_t mLastProducerID = -1;
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private:
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nsTArray<TimedImage> mImages;
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TimeStamp GetBiasedTime(const TimeStamp& aInput) const;
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// Called when we know that frames older than aImage will never get another
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// chance to be displayed.
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// Counts frames in mImages that were skipped, and adds the skipped count to
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// mSkippedFramesSinceLastComposite.
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void CountSkippedFrames(const TimedImage* aImage);
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// Update mLastFrameID and mLastProducerID, and report dropped frames.
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// Returns whether the frame changed.
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bool UpdateCompositedFrame(int aImageIndex,
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bool aWasVisibleAtPreviousComposition);
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void UpdateBias(size_t aImageIndex, bool aFrameUpdated);
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// Emit a profiler marker about video frame timestamp jitter.
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void DetectTimeStampJitter(const TimedImage* aNewImage);
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/**
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* Bias to apply to the next frame.
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*/
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Bias mBias = BIAS_NONE;
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// Video frames that were in mImages but that will never reach the screen.
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// This count is reset in UpdateCompositedFrame.
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int32_t mSkippedFramesSinceLastComposite = 0;
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// The number of dropped frames since the last call to
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// GetDroppedFramesAndReset(). Not all skipped frames are considered "dropped"
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// - for example, videos that are scrolled out of view or videos in background
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// tabs are expected to skip frames, and those skipped frames are not counted
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// as dropped frames.
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uint32_t mDroppedFrames = 0;
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// The composition opportunity IDs of the last calls to ChooseImageIndex and
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// UpdateCompositedFrame, respectively.
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CompositionOpportunityId mLastChooseImageIndexComposition;
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CompositionOpportunityId mLastFrameUpdateComposition;
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};
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} // namespace layers
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} // namespace mozilla
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#endif // MOZILLA_GFX_IMAGECOMPOSITE_H
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