Introduce TextPaint.measureText performance tests.

/*

 * Copyright (C) 2016 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package android.graphics.perftests;

import android.graphics.Canvas;

import android.perftests.utils.BenchmarkState;

import android.perftests.utils.PerfStatusReporter;

import android.support.test.filters.LargeTest;

import android.text.TextPaint;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.junit.runners.Parameterized;

import java.util.Arrays;

import java.util.Collection;

@LargeTest

@RunWith(Parameterized.class)

public class PaintMeasureTextTest {

    private static final int USE_CACHE = 0;

    private static final int DONT_USE_CACHE = 1;

    @Parameterized.Parameters(name = "{0}")

    public static Collection measureSpecs() {

        return Arrays.asList(new Object[][] {

                { "alphabet_cached", USE_CACHE, "a" },

                { "alphabet_not_cached", DONT_USE_CACHE, "a" },

                // U+4E80 is an ideograph.

                { "ideograph_cached", USE_CACHE, "\u4E80" },

                { "ideograph_not_cached", DONT_USE_CACHE, "\u4E80" },

                // U+20B9F(\uD842\uDF9F) is an ideograph.

                { "surrogate_pairs_cached", USE_CACHE, "\uD842\uDF9F" },

                { "surrogate_pairs_not_cached", DONT_USE_CACHE, "\uD842\uDF9F" },

                // U+303D is PART ALTERNATION MARK

                { "emoji_cached", USE_CACHE, "\u231A" },

                { "emoji_not_cached", DONT_USE_CACHE, "\u231A" },

                // U+1F368(\uD83C\uDF68) is ICE CREAM

                { "emoji_surrogate_pairs_cached", USE_CACHE, "\uD83C\uDF68" },

                { "emoji_surrogate_pairs_not_cached", DONT_USE_CACHE, "\uD83C\uDF68" },

        });

    }

    private final String mText;

    private final int mCacheMode;

    public PaintMeasureTextTest(String key, int cacheMode, String text) {

        mText = text;

        mCacheMode = cacheMode;

    }

    @Rule

    public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter();

    @Test

    public void testMeasureTextPerf() {

        TextPaint paint = new TextPaint();

        BenchmarkState state = mPerfStatusReporter.getBenchmarkState();

        if (mCacheMode == USE_CACHE) {

            paint.measureText(mText);

        } else {

            Canvas.freeTextLayoutCaches();

        }

        while (state.keepRunning()) {

            state.pauseTiming();

            if (mCacheMode == DONT_USE_CACHE) {

                Canvas.freeTextLayoutCaches();

            }

            state.resumeTiming();

            paint.measureText(mText);

        }

    }

}