82dbc7429f
This change moves the frame time history tracking code out of Layer and into a new class called FrameTracker. It also changes the tracking to use signal timestamps from fences when available for more accurate results. Change-Id: I323c5f075c58bf86ce363b52af885ad0f6365f2b
121 lines
4.3 KiB
C++
121 lines
4.3 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_FRAMETRACKER_H
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#define ANDROID_FRAMETRACKER_H
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#include <stddef.h>
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#include <utils/Timers.h>
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#include <utils/RefBase.h>
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namespace android {
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class String8;
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class Fence;
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// FrameTracker tracks information about the most recently rendered frames. It
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// uses a circular buffer of frame records, and is *NOT* thread-safe -
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// mutexing must be done at a higher level if multi-threaded access is
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// possible.
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//
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// Some of the time values tracked may be set either as a specific timestamp
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// or a fence. When a non-NULL fence is set for a given time value, the
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// signal time of that fence is used instead of the timestamp.
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class FrameTracker {
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public:
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// NUM_FRAME_RECORDS is the size of the circular buffer used to track the
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// frame time history.
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enum { NUM_FRAME_RECORDS = 128 };
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FrameTracker();
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// setDesiredPresentTime sets the time at which the current frame
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// should be presented to the user under ideal (i.e. zero latency)
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// conditions.
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void setDesiredPresentTime(nsecs_t desiredPresentTime);
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// setFrameReadyTime sets the time at which the current frame became ready
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// to be presented to the user. For example, if the frame contents is
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// being written to memory by some asynchronous hardware, this would be
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// the time at which those writes completed.
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void setFrameReadyTime(nsecs_t readyTime);
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// setFrameReadyFence sets the fence that is used to get the time at which
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// the current frame became ready to be presented to the user.
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void setFrameReadyFence(const sp<Fence>& readyFence);
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// setActualPresentTime sets the timestamp at which the current frame became
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// visible to the user.
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void setActualPresentTime(nsecs_t displayTime);
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// setActualPresentFence sets the fence that is used to get the time
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// at which the current frame became visible to the user.
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void setActualPresentFence(const sp<Fence>& fence);
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// advanceFrame advances the frame tracker to the next frame.
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void advanceFrame();
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// clear resets all the tracked frame data to zero.
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void clear();
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// dump appends the current frame display time history to the result string.
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void dump(String8& result) const;
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private:
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struct FrameRecord {
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FrameRecord() :
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desiredPresentTime(0),
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frameReadyTime(0),
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actualPresentTime(0) {}
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nsecs_t desiredPresentTime;
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nsecs_t frameReadyTime;
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nsecs_t actualPresentTime;
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sp<Fence> frameReadyFence;
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sp<Fence> actualPresentFence;
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};
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// processFences iterates over all the frame records that have a fence set
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// and replaces that fence with a timestamp if the fence has signaled. If
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// the fence is not signaled the record's displayTime is set to INT64_MAX.
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//
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// This method is const because although it modifies the frame records it
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// does so in such a way that the information represented should not
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// change. This allows it to be called from the dump method.
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void processFences() const;
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// mFrameRecords is the circular buffer storing the tracked data for each
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// frame.
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FrameRecord mFrameRecords[NUM_FRAME_RECORDS];
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// mOffset is the offset into mFrameRecords of the current frame.
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size_t mOffset;
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// mNumFences is the total number of fences set in the frame records. It
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// is incremented each time a fence is added and decremented each time a
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// signaled fence is removed in processFences or if advanceFrame clobbers
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// a fence.
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//
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// The number of fences is tracked so that the run time of processFences
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// doesn't grow with NUM_FRAME_RECORDS.
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int mNumFences;
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};
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}
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#endif // ANDROID_FRAMETRACKER_H
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