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mobile/android/base/gfx/PanningPerfAPI.java@b8a032363ba2 (annotated)

mobile/android/base/gfx/PanningPerfAPI.java

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
michael@0	2	* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	3	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	4	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	5
michael@0	6	package org.mozilla.gecko.gfx;
michael@0	7
michael@0	8	import org.mozilla.gecko.mozglue.RobocopTarget;
michael@0	9
michael@0	10	import android.os.SystemClock;
michael@0	11	import android.util.Log;
michael@0	12
michael@0	13	import java.util.ArrayList;
michael@0	14	import java.util.List;
michael@0	15
michael@0	16	public class PanningPerfAPI {
michael@0	17	private static final String LOGTAG = "GeckoPanningPerfAPI";
michael@0	18
michael@0	19	// make this large enough to avoid having to resize the frame time
michael@0	20	// list, as that may be expensive and impact the thing we're trying
michael@0	21	// to measure.
michael@0	22	private static final int EXPECTED_FRAME_COUNT = 2048;
michael@0	23
michael@0	24	private static boolean mRecordingFrames = false;
michael@0	25	private static List<Long> mFrameTimes;
michael@0	26	private static long mFrameStartTime;
michael@0	27
michael@0	28	private static boolean mRecordingCheckerboard = false;
michael@0	29	private static List<Float> mCheckerboardAmounts;
michael@0	30	private static long mCheckerboardStartTime;
michael@0	31
michael@0	32	private static void initialiseRecordingArrays() {
michael@0	33	if (mFrameTimes == null) {
michael@0	34	mFrameTimes = new ArrayList<Long>(EXPECTED_FRAME_COUNT);
michael@0	35	} else {
michael@0	36	mFrameTimes.clear();
michael@0	37	}
michael@0	38	if (mCheckerboardAmounts == null) {
michael@0	39	mCheckerboardAmounts = new ArrayList<Float>(EXPECTED_FRAME_COUNT);
michael@0	40	} else {
michael@0	41	mCheckerboardAmounts.clear();
michael@0	42	}
michael@0	43	}
michael@0	44
michael@0	45	@RobocopTarget
michael@0	46	public static void startFrameTimeRecording() {
michael@0	47	if (mRecordingFrames || mRecordingCheckerboard) {
michael@0	48	Log.e(LOGTAG, "Error: startFrameTimeRecording() called while already recording!");
michael@0	49	return;
michael@0	50	}
michael@0	51	mRecordingFrames = true;
michael@0	52	initialiseRecordingArrays();
michael@0	53	mFrameStartTime = SystemClock.uptimeMillis();
michael@0	54	}
michael@0	55
michael@0	56	@RobocopTarget
michael@0	57	public static List<Long> stopFrameTimeRecording() {
michael@0	58	if (!mRecordingFrames) {
michael@0	59	Log.e(LOGTAG, "Error: stopFrameTimeRecording() called when not recording!");
michael@0	60	return null;
michael@0	61	}
michael@0	62	mRecordingFrames = false;
michael@0	63	return mFrameTimes;
michael@0	64	}
michael@0	65
michael@0	66	public static void recordFrameTime() {
michael@0	67	// this will be called often, so try to make it as quick as possible
michael@0	68	if (mRecordingFrames) {
michael@0	69	mFrameTimes.add(SystemClock.uptimeMillis() - mFrameStartTime);
michael@0	70	}
michael@0	71	}
michael@0	72
michael@0	73	public static boolean isRecordingCheckerboard() {
michael@0	74	return mRecordingCheckerboard;
michael@0	75	}
michael@0	76
michael@0	77	@RobocopTarget
michael@0	78	public static void startCheckerboardRecording() {
michael@0	79	if (mRecordingCheckerboard || mRecordingFrames) {
michael@0	80	Log.e(LOGTAG, "Error: startCheckerboardRecording() called while already recording!");
michael@0	81	return;
michael@0	82	}
michael@0	83	mRecordingCheckerboard = true;
michael@0	84	initialiseRecordingArrays();
michael@0	85	mCheckerboardStartTime = SystemClock.uptimeMillis();
michael@0	86	}
michael@0	87
michael@0	88	@RobocopTarget
michael@0	89	public static List<Float> stopCheckerboardRecording() {
michael@0	90	if (!mRecordingCheckerboard) {
michael@0	91	Log.e(LOGTAG, "Error: stopCheckerboardRecording() called when not recording!");
michael@0	92	return null;
michael@0	93	}
michael@0	94	mRecordingCheckerboard = false;
michael@0	95
michael@0	96	// We take the number of values in mCheckerboardAmounts here, as there's
michael@0	97	// the possibility that this function is called while recordCheckerboard
michael@0	98	// is still executing. As values are added to this list last, we use
michael@0	99	// this number as the canonical number of recordings.
michael@0	100	int values = mCheckerboardAmounts.size();
michael@0	101
michael@0	102	// The score will be the sum of all the values in mCheckerboardAmounts,
michael@0	103	// so weight the checkerboard values by time so that frame-rate and
michael@0	104	// run-length don't affect score.
michael@0	105	long lastTime = 0;
michael@0	106	float totalTime = mFrameTimes.get(values - 1);
michael@0	107	for (int i = 0; i < values; i++) {
michael@0	108	long elapsedTime = mFrameTimes.get(i) - lastTime;
michael@0	109	mCheckerboardAmounts.set(i, mCheckerboardAmounts.get(i) * elapsedTime / totalTime);
michael@0	110	lastTime += elapsedTime;
michael@0	111	}
michael@0	112
michael@0	113	return mCheckerboardAmounts;
michael@0	114	}
michael@0	115
michael@0	116	public static void recordCheckerboard(float amount) {
michael@0	117	// this will be called often, so try to make it as quick as possible
michael@0	118	if (mRecordingCheckerboard) {
michael@0	119	mFrameTimes.add(SystemClock.uptimeMillis() - mCheckerboardStartTime);
michael@0	120	mCheckerboardAmounts.add(amount);
michael@0	121	}
michael@0	122	}
michael@0	123	}