зеркало из https://github.com/mozilla/gecko-dev.git
93 строки
2.5 KiB
C++
93 строки
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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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{
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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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~ImageComposite();
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int32_t GetFrameID()
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{
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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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{
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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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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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static TimeStamp GetBiasedTime(const TimeStamp& aInput, ImageComposite::Bias aBias);
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protected:
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static Bias UpdateBias(const TimeStamp& aCompositionTime,
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const TimeStamp& aCompositedImageTime,
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const TimeStamp& aNextImageTime, // may be null
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ImageComposite::Bias aBias);
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virtual TimeStamp GetCompositionTime() 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() const;
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TimedImage* ChooseImage();
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int ChooseImageIndex() const;
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nsTArray<TimedImage> mImages;
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int32_t mLastFrameID;
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int32_t mLastProducerID;
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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;
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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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