Introduce perf test for Layout.getOffsetForHorizontal

/*

 * Copyright (C) 2018 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.text;

import android.perftests.utils.BenchmarkState;

import android.perftests.utils.PerfStatusReporter;

import android.support.test.filters.LargeTest;

import android.support.test.runner.AndroidJUnit4;

import org.junit.Before;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;

@LargeTest

@RunWith(AndroidJUnit4.class)

public class StaticLayoutGetOffsetForHorizontalPerfTest {

    private static final int WORD_LENGTH = 9;  // Random word has 9 characters.

    private static final int WORDS_IN_LINE = 64;  // Roughly, 64 words in a line.

    private static final boolean NO_STYLE_TEXT = false;

    private static final boolean STYLE_TEXT = true;

    private static TextPaint PAINT = new TextPaint();

    static {

        PAINT.setTextSize(16.0f);

    }

    private static final int TEXT_WIDTH = WORDS_IN_LINE * WORD_LENGTH * (int) PAINT.getTextSize();

    public StaticLayoutGetOffsetForHorizontalPerfTest() {}

    @Rule

    public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter();

    private TextPerfUtils mTextUtil = new TextPerfUtils();

    @Before

    public void setUp() {

        mTextUtil.resetRandom(0 /* seed */);

    }

    @Test

    public void testGetOffsetForHorizontal_LTR() {

        final BenchmarkState state = mPerfStatusReporter.getBenchmarkState();

        while (state.keepRunning()) {

            state.pauseTiming();

            final CharSequence text = mTextUtil.nextRandomParagraph(WORD_LENGTH, NO_STYLE_TEXT,

                    "[a-zA-Z]");

            StaticLayout layout =

                    StaticLayout.Builder.obtain(text, 0, text.length(), PAINT, TEXT_WIDTH).build();

            state.resumeTiming();

            layout.getOffsetForHorizontal(0, TEXT_WIDTH / 2.0f);

        }

    }

    @Test

    public void testGetOffsetForHorizontal_RTL() {

        final BenchmarkState state = mPerfStatusReporter.getBenchmarkState();

        while (state.keepRunning()) {

            state.pauseTiming();

            final CharSequence text = mTextUtil.nextRandomParagraph(WORD_LENGTH, NO_STYLE_TEXT,

                    "[:Arabic:]");

            StaticLayout layout =

                    StaticLayout.Builder.obtain(text, 0, text.length(), PAINT, TEXT_WIDTH).build();

            state.resumeTiming();

            layout.getOffsetForHorizontal(0, TEXT_WIDTH / 2.0f);

        }

    }

    @Test

    public void testGetOffsetForHorizontal_BiDi() {

        final BenchmarkState state = mPerfStatusReporter.getBenchmarkState();

        while (state.keepRunning()) {

            state.pauseTiming();

            final CharSequence text = mTextUtil.nextRandomParagraph(WORD_LENGTH, NO_STYLE_TEXT,

                    "[[a-zA-Z][:Arabic:]]");

            StaticLayout layout =

                    StaticLayout.Builder.obtain(text, 0, text.length(), PAINT, TEXT_WIDTH).build();

            state.resumeTiming();

            layout.getOffsetForHorizontal(0, TEXT_WIDTH / 2.0f);

        }

    }

}