/*
 * Copyright (C) 2008 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.cts;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.testng.Assert.assertThrows;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.graphics.Color;
import android.graphics.Rect;
import android.os.Parcel;
import android.os.ParcelFileDescriptor;
import android.platform.test.annotations.LargeTest;
import android.system.ErrnoException;
import android.system.Os;
import android.util.DisplayMetrics;
import android.util.TypedValue;

import androidx.test.InstrumentationRegistry;
import androidx.test.filters.SmallTest;

import com.android.compatibility.common.util.BitmapUtils;
import com.android.compatibility.common.util.CddTest;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.util.concurrent.CountDownLatch;

import junitparams.JUnitParamsRunner;
import junitparams.Parameters;

@SmallTest
@RunWith(JUnitParamsRunner.class)
public class BitmapFactoryTest {
    // height and width of start.jpg
    private static final int START_HEIGHT = 31;
    private static final int START_WIDTH = 31;

    static class TestImage {
        TestImage(int id, int width, int height) {
            this.id = id;
            this.width = width;
            this.height = height;
        }
        public final int id;
        public final int width;
        public final int height;
    }

    private Object[] testImages() {
        return new Object[] {
                new TestImage(R.drawable.baseline_jpeg, 1280, 960),
                new TestImage(R.drawable.png_test, 640, 480),
                new TestImage(R.drawable.gif_test, 320, 240),
                new TestImage(R.drawable.bmp_test, 320, 240),
                new TestImage(R.drawable.webp_test, 640, 480),
        };
    }

    private static final int[] RAW_COLORS = new int[] {
        // raw data from R.drawable.premul_data
        Color.argb(255, 0, 0, 0),
        Color.argb(128, 255, 0, 0),
        Color.argb(128, 25, 26, 27),
        Color.argb(2, 255, 254, 253),
    };

    private static final int[] DEPREMUL_COLORS = new int[] {
        // data from R.drawable.premul_data, after premultiplied store + un-premultiplied load
        Color.argb(255, 0, 0, 0),
        Color.argb(128, 255, 0, 0),
        Color.argb(128, 26, 26, 28),
        Color.argb(2, 255, 255, 255),
    };

    private Resources mRes;
    // opt for non-null
    private BitmapFactory.Options mOpt1;
    // opt for null
    private BitmapFactory.Options mOpt2;
    private int mDefaultDensity;
    private int mTargetDensity;

    @Before
    public void setup() {
        mRes = InstrumentationRegistry.getTargetContext().getResources();
        mDefaultDensity = DisplayMetrics.DENSITY_DEFAULT;
        mTargetDensity = mRes.getDisplayMetrics().densityDpi;

        mOpt1 = new BitmapFactory.Options();
        mOpt1.inScaled = false;
        mOpt2 = new BitmapFactory.Options();
        mOpt2.inScaled = false;
        mOpt2.inJustDecodeBounds = true;
    }

    @Test
    public void testConstructor() {
        new BitmapFactory();
    }

    @Test
    public void testDecodeResource1() {
        Bitmap b = BitmapFactory.decodeResource(mRes, R.drawable.start,
                mOpt1);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT, b.getHeight());
        assertEquals(START_WIDTH, b.getWidth());
        // Test if no bitmap
        assertNull(BitmapFactory.decodeResource(mRes, R.drawable.start, mOpt2));
    }

    @Test
    public void testDecodeResource2() {
        Bitmap b = BitmapFactory.decodeResource(mRes, R.drawable.start);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT * mTargetDensity / mDefaultDensity, b.getHeight(), 1.1);
        assertEquals(START_WIDTH * mTargetDensity / mDefaultDensity, b.getWidth(), 1.1);
    }

    @Test
    public void testDecodeResourceStream() {
        InputStream is = obtainInputStream();
        Rect r = new Rect(1, 1, 1, 1);
        TypedValue value = new TypedValue();
        Bitmap b = BitmapFactory.decodeResourceStream(mRes, value, is, r, mOpt1);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT, b.getHeight());
        assertEquals(START_WIDTH, b.getWidth());
    }

    @Test
    public void testDecodeByteArray1() {
        byte[] array = obtainArray();
        Bitmap b = BitmapFactory.decodeByteArray(array, 0, array.length, mOpt1);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT, b.getHeight());
        assertEquals(START_WIDTH, b.getWidth());
        // Test if no bitmap
        assertNull(BitmapFactory.decodeByteArray(array, 0, array.length, mOpt2));
    }

    @Test
    public void testDecodeByteArray2() {
        byte[] array = obtainArray();
        Bitmap b = BitmapFactory.decodeByteArray(array, 0, array.length);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT, b.getHeight());
        assertEquals(START_WIDTH, b.getWidth());
    }

    @Test
    public void testDecodeStream1() {
        InputStream is = obtainInputStream();
        Rect r = new Rect(1, 1, 1, 1);
        Bitmap b = BitmapFactory.decodeStream(is, r, mOpt1);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT, b.getHeight());
        assertEquals(START_WIDTH, b.getWidth());
        // Test if no bitmap
        assertNull(BitmapFactory.decodeStream(is, r, mOpt2));
    }

    @Test
    public void testDecodeStream2() {
        InputStream is = obtainInputStream();
        Bitmap b = BitmapFactory.decodeStream(is);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT, b.getHeight());
        assertEquals(START_WIDTH, b.getWidth());
    }

    @Test
    @Parameters(method = "testImages")
    public void testDecodeStream3(TestImage testImage) {
        InputStream is = obtainInputStream(testImage.id);
        Bitmap b = BitmapFactory.decodeStream(is);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(testImage.width, b.getWidth());
        assertEquals(testImage.height, b.getHeight());
    }

    private Object[] paramsForWebpDecodeEncode() {
        return new Object[] {
                new Object[] {Config.ARGB_8888, 16},
                new Object[] {Config.RGB_565, 49}
        };
    }

    private Bitmap decodeOpaqueImage(int resId, BitmapFactory.Options options) {
        return decodeOpaqueImage(obtainInputStream(resId), options);
    }

    private Bitmap decodeOpaqueImage(InputStream stream, BitmapFactory.Options options) {
        Bitmap bitmap = BitmapFactory.decodeStream(stream, null, options);
        assertNotNull(bitmap);
        assertFalse(bitmap.isPremultiplied());
        assertFalse(bitmap.hasAlpha());
        return bitmap;
    }

    @Test
    @Parameters(method = "paramsForWebpDecodeEncode")
    public void testWebpStreamDecode(Config config, int tolerance) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = config;

        // Decode the PNG & WebP test images. The WebP test image has been encoded from PNG test
        // image and should have same similar (within some error-tolerance) Bitmap data.
        Bitmap bPng = decodeOpaqueImage(R.drawable.png_test, options);
        assertEquals(bPng.getConfig(), config);
        Bitmap bWebp = decodeOpaqueImage(R.drawable.webp_test, options);
        BitmapUtils.assertBitmapsMse(bPng, bWebp, tolerance, true, bPng.isPremultiplied());
    }

    @Test
    @Parameters(method = "paramsForWebpDecodeEncode")
    public void testWebpStreamEncode(Config config, int tolerance) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = config;

        Bitmap bPng = decodeOpaqueImage(R.drawable.png_test, options);
        assertEquals(bPng.getConfig(), config);

        // Compress the PNG image to WebP format (Quality=90) and decode it back.
        // This will test end-to-end WebP encoding and decoding.
        ByteArrayOutputStream oStreamWebp = new ByteArrayOutputStream();
        assertTrue(bPng.compress(CompressFormat.WEBP, 90, oStreamWebp));
        InputStream iStreamWebp = new ByteArrayInputStream(oStreamWebp.toByteArray());
        Bitmap bWebp2 = decodeOpaqueImage(iStreamWebp, options);
        BitmapUtils.assertBitmapsMse(bPng, bWebp2, tolerance, true, bPng.isPremultiplied());
    }

    @Test
    public void testDecodeStream5() {
        final int tolerance = 72;
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Config.ARGB_8888;

        // Decode the PNG & WebP (google_logo) images. The WebP image has
        // been encoded from PNG image.
        InputStream iStreamPng = obtainInputStream(R.drawable.google_logo_1);
        Bitmap bPng = BitmapFactory.decodeStream(iStreamPng, null, options);
        assertNotNull(bPng);
        assertEquals(bPng.getConfig(), Config.ARGB_8888);
        assertTrue(bPng.isPremultiplied());
        assertTrue(bPng.hasAlpha());

        // Decode the corresponding WebP (transparent) image (google_logo_2.webp).
        InputStream iStreamWebP1 = obtainInputStream(R.drawable.google_logo_2);
        Bitmap bWebP1 = BitmapFactory.decodeStream(iStreamWebP1, null, options);
        assertNotNull(bWebP1);
        assertEquals(bWebP1.getConfig(), Config.ARGB_8888);
        assertTrue(bWebP1.isPremultiplied());
        assertTrue(bWebP1.hasAlpha());
        BitmapUtils.assertBitmapsMse(bPng, bWebP1, tolerance, true, bPng.isPremultiplied());

        // Compress the PNG image to WebP format (Quality=90) and decode it back.
        // This will test end-to-end WebP encoding and decoding.
        ByteArrayOutputStream oStreamWebp = new ByteArrayOutputStream();
        assertTrue(bPng.compress(CompressFormat.WEBP, 90, oStreamWebp));
        InputStream iStreamWebp2 = new ByteArrayInputStream(oStreamWebp.toByteArray());
        Bitmap bWebP2 = BitmapFactory.decodeStream(iStreamWebp2, null, options);
        assertNotNull(bWebP2);
        assertEquals(bWebP2.getConfig(), Config.ARGB_8888);
        assertTrue(bWebP2.isPremultiplied());
        assertTrue(bWebP2.hasAlpha());
        BitmapUtils.assertBitmapsMse(bPng, bWebP2, tolerance, true, bPng.isPremultiplied());
    }

    @Test
    public void testDecodeFileDescriptor1() throws IOException {
        ParcelFileDescriptor pfd = obtainParcelDescriptor(obtainPath());
        FileDescriptor input = pfd.getFileDescriptor();
        Rect r = new Rect(1, 1, 1, 1);
        Bitmap b = BitmapFactory.decodeFileDescriptor(input, r, mOpt1);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT, b.getHeight());
        assertEquals(START_WIDTH, b.getWidth());
        // Test if no bitmap
        assertNull(BitmapFactory.decodeFileDescriptor(input, r, mOpt2));
    }

    @Test
    public void testDecodeFileDescriptor2() throws IOException {
        ParcelFileDescriptor pfd = obtainParcelDescriptor(obtainPath());
        FileDescriptor input = pfd.getFileDescriptor();
        Bitmap b = BitmapFactory.decodeFileDescriptor(input);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT, b.getHeight());
        assertEquals(START_WIDTH, b.getWidth());
    }


    // TODO: Better parameterize this and split it up.
    @Test
    @Parameters(method = "testImages")
    public void testDecodeFileDescriptor3(TestImage testImage) throws IOException {
        // Arbitrary offsets to use. If the offset of the FD matches the offset of the image,
        // decoding should succeed, but if they do not match, decoding should fail.
        final long[] actual_offsets = new long[] { 0, 17 };
        for (int j = 0; j < actual_offsets.length; ++j) {
            // FIXME: The purgeable test should attempt to purge the memory
            // to force a re-decode.
            for (boolean purgeable : new boolean[] { false, true }) {
                BitmapFactory.Options opts = new BitmapFactory.Options();
                opts.inPurgeable = purgeable;
                opts.inInputShareable = purgeable;

                long actualOffset = actual_offsets[j];
                String path = Utils.obtainPath(testImage.id, actualOffset);
                RandomAccessFile file = new RandomAccessFile(path, "r");
                FileDescriptor fd = file.getFD();
                assertTrue(fd.valid());

                // Set the offset to ACTUAL_OFFSET
                file.seek(actualOffset);
                assertEquals(file.getFilePointer(), actualOffset);

                // Now decode. This should be successful and leave the offset
                // unchanged.
                Bitmap b = BitmapFactory.decodeFileDescriptor(fd, null, opts);
                assertNotNull(b);
                assertEquals(file.getFilePointer(), actualOffset);

                // Now use the other offset. It should fail to decode, and
                // the offset should remain unchanged.
                long otherOffset = actual_offsets[(j + 1) % actual_offsets.length];
                assertFalse(otherOffset == actualOffset);
                file.seek(otherOffset);
                assertEquals(file.getFilePointer(), otherOffset);

                b = BitmapFactory.decodeFileDescriptor(fd, null, opts);
                assertNull(b);
                assertEquals(file.getFilePointer(), otherOffset);
            }
        }
    }

    @Test
    public void testDecodeFile1() throws IOException {
        Bitmap b = BitmapFactory.decodeFile(obtainPath(), mOpt1);
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT, b.getHeight());
        assertEquals(START_WIDTH, b.getWidth());
        // Test if no bitmap
        assertNull(BitmapFactory.decodeFile(obtainPath(), mOpt2));
    }

    @Test
    public void testDecodeFile2() throws IOException {
        Bitmap b = BitmapFactory.decodeFile(obtainPath());
        assertNotNull(b);
        // Test the bitmap size
        assertEquals(START_HEIGHT, b.getHeight());
        assertEquals(START_WIDTH, b.getWidth());
    }

    @Test
    public void testDecodeReuseBasic() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inMutable = true;
        options.inSampleSize = 0; // treated as 1
        options.inScaled = false;
        Bitmap start = BitmapFactory.decodeResource(mRes, R.drawable.start, options);
        int originalSize = start.getByteCount();
        assertEquals(originalSize, start.getAllocationByteCount());

        options.inBitmap = start;
        options.inMutable = false; // will be overridden by non-null inBitmap
        options.inSampleSize = -42; // treated as 1
        Bitmap pass = BitmapFactory.decodeResource(mRes, R.drawable.pass, options);

        assertEquals(originalSize, pass.getByteCount());
        assertEquals(originalSize, pass.getAllocationByteCount());
        assertSame(start, pass);
        assertTrue(pass.isMutable());
    }

    @Test
    public void testDecodeReuseAttempt() {
        // BitmapFactory "silently" ignores an immutable inBitmap. (It does print a log message.)
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inMutable = false;

        Bitmap start = BitmapFactory.decodeResource(mRes, R.drawable.start, options);
        assertFalse(start.isMutable());

        options.inBitmap = start;
        Bitmap pass = BitmapFactory.decodeResource(mRes, R.drawable.pass, options);
        assertNotNull(pass);
        assertNotEquals(start, pass);
    }

    @Test
    public void testDecodeReuseRecycled() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inMutable = true;

        Bitmap start = BitmapFactory.decodeResource(mRes, R.drawable.start, options);
        assertNotNull(start);
        start.recycle();

        options.inBitmap = start;

        assertThrows(IllegalArgumentException.class, () -> {
            BitmapFactory.decodeResource(mRes, R.drawable.pass, options);
        });
    }

    @Test
    public void testDecodeReuseHardware() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.HARDWARE;

        Bitmap start = BitmapFactory.decodeResource(mRes, R.drawable.start, options);
        assertNotNull(start);

        options.inBitmap = start;

        assertThrows(IllegalArgumentException.class, () -> {
            BitmapFactory.decodeResource(mRes, R.drawable.pass, options);
        });
    }

    /**
     * Create bitmap sized to load unscaled resources: start, pass, and alpha
     */
    private Bitmap createBitmapForReuse(int pixelCount) {
        Bitmap bitmap = Bitmap.createBitmap(pixelCount, 1, Config.ARGB_8888);
        bitmap.eraseColor(Color.BLACK);
        bitmap.setHasAlpha(false);
        return bitmap;
    }

    /**
     * Decode resource with ResId into reuse bitmap without scaling, verifying expected hasAlpha
     */
    private void decodeResourceWithReuse(Bitmap reuse, int resId, boolean hasAlpha) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inMutable = true;
        options.inSampleSize = 1;
        options.inScaled = false;
        options.inBitmap = reuse;
        Bitmap output = BitmapFactory.decodeResource(mRes, resId, options);
        assertSame(reuse, output);
        assertEquals(output.hasAlpha(), hasAlpha);
    }

    @Test
    public void testDecodeReuseHasAlpha() {
        final int bitmapSize = 31; // size in pixels of start, pass, and alpha resources
        final int pixelCount = bitmapSize * bitmapSize;

        // Test reuse, hasAlpha false and true
        Bitmap bitmap = createBitmapForReuse(pixelCount);
        decodeResourceWithReuse(bitmap, R.drawable.start, false);
        decodeResourceWithReuse(bitmap, R.drawable.alpha, true);

        // Test pre-reconfigure, hasAlpha false and true
        bitmap = createBitmapForReuse(pixelCount);
        bitmap.reconfigure(bitmapSize, bitmapSize, Config.ARGB_8888);
        bitmap.setHasAlpha(true);
        decodeResourceWithReuse(bitmap, R.drawable.start, false);

        bitmap = createBitmapForReuse(pixelCount);
        bitmap.reconfigure(bitmapSize, bitmapSize, Config.ARGB_8888);
        decodeResourceWithReuse(bitmap, R.drawable.alpha, true);
    }

    @Test
    @Parameters(method = "testImages")
    public void testDecodeReuseFormats(TestImage testImage) {
        // reuse should support all image formats
        Bitmap reuseBuffer = Bitmap.createBitmap(1000000, 1, Bitmap.Config.ALPHA_8);

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inBitmap = reuseBuffer;
        options.inSampleSize = 4;
        options.inScaled = false;
        Bitmap decoded = BitmapFactory.decodeResource(mRes, testImage.id, options);
        assertSame(reuseBuffer, decoded);
    }

    @Test
    public void testDecodeReuseFailure() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inMutable = true;
        options.inScaled = false;
        options.inSampleSize = 4;
        Bitmap reduced = BitmapFactory.decodeResource(mRes, R.drawable.robot, options);

        options.inBitmap = reduced;
        options.inSampleSize = 1;
        try {
            BitmapFactory.decodeResource(mRes, R.drawable.robot, options);
            fail("should throw exception due to lack of space");
        } catch (IllegalArgumentException e) {
        }
    }

    @Test
    public void testDecodeReuseScaling() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inMutable = true;
        options.inScaled = false;
        Bitmap original = BitmapFactory.decodeResource(mRes, R.drawable.robot, options);
        int originalSize = original.getByteCount();
        assertEquals(originalSize, original.getAllocationByteCount());

        options.inBitmap = original;
        options.inSampleSize = 4;
        Bitmap reduced = BitmapFactory.decodeResource(mRes, R.drawable.robot, options);

        assertSame(original, reduced);
        assertEquals(originalSize, reduced.getAllocationByteCount());
        assertEquals(originalSize, reduced.getByteCount() * 16);
    }

    @Test
    public void testDecodeReuseDoubleScaling() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inMutable = true;
        options.inScaled = false;
        options.inSampleSize = 1;
        Bitmap original = BitmapFactory.decodeResource(mRes, R.drawable.robot, options);
        int originalSize = original.getByteCount();

        // Verify that inSampleSize and density scaling both work with reuse concurrently
        options.inBitmap = original;
        options.inScaled = true;
        options.inSampleSize = 2;
        options.inDensity = 2;
        options.inTargetDensity = 4;
        Bitmap doubleScaled = BitmapFactory.decodeResource(mRes, R.drawable.robot, options);

        assertSame(original, doubleScaled);
        assertEquals(4, doubleScaled.getDensity());
        assertEquals(originalSize, doubleScaled.getByteCount());
    }

    @Test
    public void testDecodeReuseEquivalentScaling() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inMutable = true;
        options.inScaled = true;
        options.inDensity = 4;
        options.inTargetDensity = 2;
        Bitmap densityReduced = BitmapFactory.decodeResource(mRes, R.drawable.robot, options);
        assertEquals(2, densityReduced.getDensity());
        options.inBitmap = densityReduced;
        options.inDensity = 0;
        options.inScaled = false;
        options.inSampleSize = 2;
        Bitmap scaleReduced = BitmapFactory.decodeResource(mRes, R.drawable.robot, options);
        // verify that density isn't incorrectly carried over during bitmap reuse
        assertFalse(densityReduced.getDensity() == 2);
        assertFalse(densityReduced.getDensity() == 0);
        assertSame(densityReduced, scaleReduced);
    }

    @Test
    public void testDecodePremultipliedDefault() {
        Bitmap simplePremul = BitmapFactory.decodeResource(mRes, R.drawable.premul_data);
        assertTrue(simplePremul.isPremultiplied());
    }

    @Test
    public void testDecodePremultipliedData() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inScaled = false;
        Bitmap premul = BitmapFactory.decodeResource(mRes, R.drawable.premul_data, options);
        options.inPremultiplied = false;
        Bitmap unpremul = BitmapFactory.decodeResource(mRes, R.drawable.premul_data, options);
        assertEquals(premul.getConfig(), Bitmap.Config.ARGB_8888);
        assertEquals(unpremul.getConfig(), Bitmap.Config.ARGB_8888);
        assertTrue(premul.getHeight() == 1 && unpremul.getHeight() == 1);
        assertTrue(premul.getWidth() == unpremul.getWidth() &&
                   DEPREMUL_COLORS.length == RAW_COLORS.length &&
                   premul.getWidth() == DEPREMUL_COLORS.length);

        // verify pixel data - unpremul should have raw values, premul will have rounding errors
        for (int i = 0; i < premul.getWidth(); i++) {
            assertEquals(premul.getPixel(i, 0), DEPREMUL_COLORS[i]);
            assertEquals(unpremul.getPixel(i, 0), RAW_COLORS[i]);
        }
    }

    @Test
    public void testDecodeInPurgeableAllocationCount() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inSampleSize = 1;
        options.inJustDecodeBounds = false;
        options.inPurgeable = true;
        options.inInputShareable = false;
        byte[] array = obtainArray();
        Bitmap purgeableBitmap = BitmapFactory.decodeByteArray(array, 0, array.length, options);
        assertFalse(purgeableBitmap.getAllocationByteCount() == 0);
    }

    private int mDefaultCreationDensity;
    private void verifyScaled(Bitmap b) {
        assertEquals(b.getWidth(), START_WIDTH * 2);
        assertEquals(b.getDensity(), 2);
    }

    private void verifyUnscaled(Bitmap b) {
        assertEquals(b.getWidth(), START_WIDTH);
        assertEquals(b.getDensity(), mDefaultCreationDensity);
    }

    @Test
    public void testDecodeScaling() {
        BitmapFactory.Options defaultOpt = new BitmapFactory.Options();

        BitmapFactory.Options unscaledOpt = new BitmapFactory.Options();
        unscaledOpt.inScaled = false;

        BitmapFactory.Options scaledOpt = new BitmapFactory.Options();
        scaledOpt.inScaled = true;
        scaledOpt.inDensity = 1;
        scaledOpt.inTargetDensity = 2;

        mDefaultCreationDensity = Bitmap.createBitmap(1, 1, Config.ARGB_8888).getDensity();

        byte[] bytes = obtainArray();

        verifyUnscaled(BitmapFactory.decodeByteArray(bytes, 0, bytes.length));
        verifyUnscaled(BitmapFactory.decodeByteArray(bytes, 0, bytes.length, null));
        verifyUnscaled(BitmapFactory.decodeByteArray(bytes, 0, bytes.length, unscaledOpt));
        verifyUnscaled(BitmapFactory.decodeByteArray(bytes, 0, bytes.length, defaultOpt));

        verifyUnscaled(BitmapFactory.decodeStream(obtainInputStream()));
        verifyUnscaled(BitmapFactory.decodeStream(obtainInputStream(), null, null));
        verifyUnscaled(BitmapFactory.decodeStream(obtainInputStream(), null, unscaledOpt));
        verifyUnscaled(BitmapFactory.decodeStream(obtainInputStream(), null, defaultOpt));

        // scaling should only occur if Options are passed with inScaled=true
        verifyScaled(BitmapFactory.decodeByteArray(bytes, 0, bytes.length, scaledOpt));
        verifyScaled(BitmapFactory.decodeStream(obtainInputStream(), null, scaledOpt));
    }

    @Test
    public void testParcel() {
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inScaled = false;
        Bitmap b = BitmapFactory.decodeResource(mRes, R.drawable.gif_test, opts);
        assertNotNull(b);

        Parcel p = Parcel.obtain();
        b.writeToParcel(p, 0);

        p.setDataPosition(0);
        Bitmap b2 = Bitmap.CREATOR.createFromParcel(p);
        assertTrue(BitmapUtils.compareBitmaps(b, b2));

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        assertTrue(b2.compress(Bitmap.CompressFormat.JPEG, 50, baos));
    }

    @Test
    public void testConfigs() {
        // The output Config of a BitmapFactory decode depends on the request from the
        // client and the properties of the image to be decoded.
        //
        // Options.inPreferredConfig = Config.ARGB_8888
        //     This is the default value of inPreferredConfig.  In this case, the image
        //     will always be decoded to Config.ARGB_8888.
        // Options.inPreferredConfig = Config.RGB_565
        //     If the encoded image is opaque, we will decode to Config.RGB_565,
        //     otherwise we will decode to whichever color type is the most natural match
        //     for the encoded data.
        // Options.inPreferredConfig = Config.ARGB_4444
        //     This is deprecated and will always decode to Config.ARGB_8888.
        // Options.inPreferredConfig = Config.ALPHA_8
        //     If the encoded image is gray, we will decode to 8-bit grayscale values
        //     and indicate that the output bitmap is Config.ALPHA_8.  This is somewhat
        //     misleading because the image is really opaque and grayscale, but we are
        //     labeling each pixel as if it is a translucency (alpha) value.  If the
        //     encoded image is not gray, we will decode to whichever color type is the
        //     most natural match for the encoded data.
        // Options.inPreferredConfig = null
        //     We will decode to whichever Config is the most natural match with the
        //     encoded data.  This could be ALPHA_8 (gray) or ARGB_8888.
        //
        // This test ensures that images are decoded to the intended Config and that the
        // decodes match regardless of the Config.
        decodeConfigs(R.drawable.alpha, 31, 31, true, false);
        decodeConfigs(R.drawable.baseline_jpeg, 1280, 960, false, false);
        decodeConfigs(R.drawable.bmp_test, 320, 240, false, false);
        decodeConfigs(R.drawable.scaled2, 6, 8, false, false);
        decodeConfigs(R.drawable.grayscale_jpg, 128, 128, false, true);
        decodeConfigs(R.drawable.grayscale_png, 128, 128, false, true);
    }

    @Test(expected=IllegalArgumentException.class)
    public void testMutableHardwareInDecodeResource() {
        Options options = new Options();
        options.inMutable = true;
        options.inPreferredConfig = Config.HARDWARE;
        BitmapFactory.decodeResource(mRes, R.drawable.alpha, options);
    }

    @Test(expected=IllegalArgumentException.class)
    public void testMutableHardwareInDecodeByteArray() {
        Options options = new Options();
        options.inMutable = true;
        options.inPreferredConfig = Config.HARDWARE;
        BitmapFactory.decodeByteArray(new byte[100], 1, 20, options);
    }

    @Test(expected=IllegalArgumentException.class)
    public void testMutableHardwareInDecodeFile() {
        Options options = new Options();
        options.inMutable = true;
        options.inPreferredConfig = Config.HARDWARE;
        BitmapFactory.decodeFile("barely/care.jpg", options);
    }

    @Test(expected=IllegalArgumentException.class)
    public void testMutableHardwareInDecodeFileDescriptor() {
        Options options = new Options();
        options.inMutable = true;
        options.inPreferredConfig = Config.HARDWARE;
        BitmapFactory.decodeFileDescriptor(null, new Rect(), options);
    }

    @Test(expected=IllegalArgumentException.class)
    public void testMutableHardwareInDecodeResourceStream() {
        Options options = new Options();
        options.inMutable = true;
        options.inPreferredConfig = Config.HARDWARE;
        TypedValue value = new TypedValue();
        BitmapFactory.decodeResourceStream(mRes, value,
                new ByteArrayInputStream(new byte[20]), new Rect(), options);
    }

    @Test
    public void testDecodeHardwareBitmap() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.HARDWARE;
        Bitmap hardwareBitmap = BitmapFactory.decodeResource(mRes, R.drawable.robot, options);
        assertNotNull(hardwareBitmap);
        // Test that checks that correct bitmap was obtained is in uirendering/HardwareBitmapTests
        assertEquals(Config.HARDWARE, hardwareBitmap.getConfig());
    }

    @Test
    public void testJpegInfiniteLoop() {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inSampleSize = 19;
        Bitmap bm = BitmapFactory.decodeResource(mRes, R.raw.b78329453, options);
        assertNotNull(bm);
    }

    private static final class DNG {
        public final int resId;
        public final int width;
        public final int height;

        DNG(int resId, int width, int height) {
            this.resId    = resId;
            this.width    = width;
            this.height   = height;
        }
    }

    @Test
    @CddTest(requirement = "5.1.5/C-0-6")
    @Parameters(method = "parametersForTestDng")
    @LargeTest
    public void testDng(DNG dng) {
        byte[] bytes = ImageDecoderTest.getAsByteArray(dng.resId);
        // No scaling
        Bitmap bm = BitmapFactory.decodeByteArray(bytes, 0, bytes.length, mOpt1);
        assertNotNull(bm);
        assertEquals(dng.width, bm.getWidth());
        assertEquals(dng.height, bm.getHeight());
    }

    private Object[] parametersForTestDng() {
        return new Object[]{
                new DNG(R.raw.sample_1mp, 600, 338),
                new DNG(R.raw.sample_arw, 1616, 1080),
                new DNG(R.raw.sample_cr2, 2304, 1536),
                new DNG(R.raw.sample_nef, 4608, 3072),
                new DNG(R.raw.sample_nrw, 4000, 3000),
                new DNG(R.raw.sample_orf, 3200, 2400),
                new DNG(R.raw.sample_pef, 4928, 3264),
                new DNG(R.raw.sample_raf, 2048, 1536),
                new DNG(R.raw.sample_rw2, 1920, 1440),
                new DNG(R.raw.sample_srw, 5472, 3648),
        };
    }

    @Test
    public void testDecodePngFromPipe() {
        // This test verifies that we can send a PNG over a pipe and
        // successfully decode it. This behavior worked in N, so this
        // verifies that do not break it for backwards compatibility.
        // This was already not supported for the other Bitmap.CompressFormats
        // (JPEG and WEBP), so we do not test those.
        Bitmap source = Bitmap.createBitmap(100, 100, Config.ARGB_8888);
        source.eraseColor(Color.RED);
        try {
            Bitmap result = sendOverPipe(source, CompressFormat.PNG);
            assertTrue(source.sameAs(result));
        } catch (Exception e) {
            fail(e.toString());
        }
    }

    private Bitmap sendOverPipe(Bitmap source, CompressFormat format)
            throws IOException, ErrnoException, InterruptedException {
        FileDescriptor[] pipeFds = Os.pipe();
        final FileDescriptor readFd = pipeFds[0];
        final FileDescriptor writeFd = pipeFds[1];
        final Throwable[] compressErrors = new Throwable[1];
        final CountDownLatch writeFinished = new CountDownLatch(1);
        final CountDownLatch readFinished = new CountDownLatch(1);
        final Bitmap[] decodedResult = new Bitmap[1];
        Thread writeThread = new Thread() {
            @Override
            public void run() {
                try {
                    FileOutputStream output = new FileOutputStream(writeFd);
                    source.compress(format, 100, output);
                    output.close();
                } catch (Throwable t) {
                    compressErrors[0] = t;
                    // Try closing the FD to unblock the test thread
                    try {
                        Os.close(writeFd);
                    } catch (Throwable ignore) {}
                } finally {
                    writeFinished.countDown();
                }
            }
        };
        Thread readThread = new Thread() {
            @Override
            public void run() {
                decodedResult[0] = BitmapFactory.decodeFileDescriptor(readFd);
            }
        };
        writeThread.start();
        readThread.start();
        writeThread.join(1000);
        readThread.join(1000);
        assertFalse(writeThread.isAlive());
        if (compressErrors[0] != null) {
            fail(compressErrors[0].toString());
        }
        if (readThread.isAlive()) {
            // Test failure, try to clean up
            Os.close(writeFd);
            readThread.join(500);
            fail("Read timed out");
        }
        assertValidFd("readFd", readFd);
        assertValidFd("writeFd", writeFd);
        Os.close(readFd);
        Os.close(writeFd);
        return decodedResult[0];
    }

    private static void assertValidFd(String name, FileDescriptor fd) {
        try {
            assertTrue(fd.valid());
            // Hacky check to test that the underlying FD is still valid without using
            // the private fcntlVoid to do F_GETFD
            Os.close(Os.dup(fd));
        } catch (ErrnoException ex) {
            fail(name + " is invalid: " + ex.getMessage());
        }
    }

    private void decodeConfigs(int id, int width, int height, boolean hasAlpha, boolean isGray) {
        Options opts = new BitmapFactory.Options();
        opts.inScaled = false;
        assertEquals(Config.ARGB_8888, opts.inPreferredConfig);
        Bitmap reference = BitmapFactory.decodeResource(mRes, id, opts);
        assertNotNull(reference);
        assertEquals(width, reference.getWidth());
        assertEquals(height, reference.getHeight());
        assertEquals(Config.ARGB_8888, reference.getConfig());

        opts.inPreferredConfig = Config.ARGB_4444;
        Bitmap argb4444 = BitmapFactory.decodeResource(mRes, id, opts);
        assertNotNull(argb4444);
        assertEquals(width, argb4444.getWidth());
        assertEquals(height, argb4444.getHeight());
        // ARGB_4444 is deprecated and we should decode to ARGB_8888.
        assertEquals(Config.ARGB_8888, argb4444.getConfig());
        assertTrue(BitmapUtils.compareBitmaps(reference, argb4444));

        opts.inPreferredConfig = Config.RGB_565;
        Bitmap rgb565 = BitmapFactory.decodeResource(mRes, id, opts);
        assertNotNull(rgb565);
        assertEquals(width, rgb565.getWidth());
        assertEquals(height, rgb565.getHeight());
        if (!hasAlpha) {
            assertEquals(Config.RGB_565, rgb565.getConfig());
            // Convert the RGB_565 bitmap to ARGB_8888 and test that it is similar to
            // the reference.  We lose information when decoding to 565, so there must
            // be some tolerance.  The tolerance is intentionally loose to allow us some
            // flexibility regarding if we dither and how we color convert.
            BitmapUtils.assertBitmapsMse(reference, rgb565.copy(Config.ARGB_8888, false), 30, true,
                    true);
        }

        opts.inPreferredConfig = Config.ALPHA_8;
        Bitmap alpha8 = BitmapFactory.decodeResource(mRes, id, opts);
        assertNotNull(alpha8);
        assertEquals(width, reference.getWidth());
        assertEquals(height, reference.getHeight());
        if (isGray) {
            assertEquals(Config.ALPHA_8, alpha8.getConfig());
            // Convert the ALPHA_8 bitmap to ARGB_8888 and test that it is identical to
            // the reference.  We must do this manually because we are abusing ALPHA_8
            // in order to represent grayscale.
            assertTrue(BitmapUtils.compareBitmaps(reference, grayToARGB(alpha8)));
            assertNull(alpha8.getColorSpace());
        }

        // Setting inPreferredConfig to nullptr will cause the default Config to be
        // selected, which in this case is ARGB_8888.
        opts.inPreferredConfig = null;
        Bitmap defaultBitmap = BitmapFactory.decodeResource(mRes, id, opts);
        assertNotNull(defaultBitmap);
        assertEquals(width, defaultBitmap.getWidth());
        assertEquals(height, defaultBitmap.getHeight());
        assertEquals(Config.ARGB_8888, defaultBitmap.getConfig());
        assertTrue(BitmapUtils.compareBitmaps(reference, defaultBitmap));
    }

    private static Bitmap grayToARGB(Bitmap gray) {
        Bitmap argb = Bitmap.createBitmap(gray.getWidth(), gray.getHeight(), Config.ARGB_8888);
        for (int y = 0; y < argb.getHeight(); y++) {
            for (int x = 0; x < argb.getWidth(); x++) {
                int grayByte = Color.alpha(gray.getPixel(x, y));
                argb.setPixel(x, y, Color.rgb(grayByte, grayByte, grayByte));
            }
        }
        return argb;
    }

    private byte[] obtainArray() {
        ByteArrayOutputStream stm = new ByteArrayOutputStream();
        Options opt = new BitmapFactory.Options();
        opt.inScaled = false;
        Bitmap bitmap = BitmapFactory.decodeResource(mRes, R.drawable.start, opt);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 0, stm);
        return(stm.toByteArray());
    }

    private InputStream obtainInputStream() {
        return mRes.openRawResource(R.drawable.start);
    }

    private InputStream obtainInputStream(int resId) {
        return mRes.openRawResource(resId);
    }

    private static ParcelFileDescriptor obtainParcelDescriptor(String path) throws IOException {
        File file = new File(path);
        return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
    }

    private String obtainPath() throws IOException {
        return Utils.obtainPath(R.drawable.start, 0);
    }
}