Subversion Repositories SmartDukaan

/*

 * Copyright (C) 2011 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 com.android.volley.toolbox;

import android.graphics.Bitmap;

import android.graphics.Bitmap.Config;

import android.widget.ImageView;

import android.widget.ImageView.ScaleType;

import com.android.volley.NetworkResponse;

import com.android.volley.Response;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.robolectric.RobolectricTestRunner;

import org.robolectric.shadows.ShadowBitmapFactory;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import static org.junit.Assert.assertEquals;

import static org.junit.Assert.assertNotNull;

import static org.junit.Assert.assertTrue;

@RunWith(RobolectricTestRunner.class)

public class ImageRequestTest {

    @Test public void parseNetworkResponse_resizing() throws Exception {

        // This is a horrible hack but Robolectric doesn't have a way to provide

        // width and height hints for decodeByteArray. It works because the byte array

        // "file:fake" is ASCII encodable and thus the name in Robolectric's fake

        // bitmap creator survives as-is, and provideWidthAndHeightHints puts

        // "file:" + name in its lookaside map. I write all this because it will

        // probably break mysteriously at some point and I feel terrible about your

        // having to debug it.

        byte[] jpegBytes = "file:fake".getBytes();

        ShadowBitmapFactory.provideWidthAndHeightHints("fake", 1024, 500);

        NetworkResponse jpeg = new NetworkResponse(jpegBytes);

        // Scale the image uniformly (maintain the image's aspect ratio) so that

        // both dimensions (width and height) of the image will be equal to or

        // less than the corresponding dimension of the view.

        ScaleType scalteType = ScaleType.CENTER_INSIDE;

        // Exact sizes

        verifyResize(jpeg, 512, 250, scalteType, 512, 250); // exactly half

        verifyResize(jpeg, 511, 249, scalteType, 509, 249); // just under half

        verifyResize(jpeg, 1080, 500, scalteType, 1024, 500); // larger

        verifyResize(jpeg, 500, 500, scalteType, 500, 244); // keep same ratio

        // Specify only width, preserve aspect ratio

        verifyResize(jpeg, 512, 0, scalteType, 512, 250);

        verifyResize(jpeg, 800, 0, scalteType, 800, 390);

        verifyResize(jpeg, 1024, 0, scalteType, 1024, 500);

        // Specify only height, preserve aspect ratio

        verifyResize(jpeg, 0, 250, scalteType, 512, 250);

        verifyResize(jpeg, 0, 391, scalteType, 800, 391);

        verifyResize(jpeg, 0, 500, scalteType, 1024, 500);

        // No resize

        verifyResize(jpeg, 0, 0, scalteType, 1024, 500);

        // Scale the image uniformly (maintain the image's aspect ratio) so that

        // both dimensions (width and height) of the image will be equal to or

        // larger than the corresponding dimension of the view.

        scalteType = ScaleType.CENTER_CROP;

        // Exact sizes

        verifyResize(jpeg, 512, 250, scalteType, 512, 250);

        verifyResize(jpeg, 511, 249, scalteType, 511, 249);

        verifyResize(jpeg, 1080, 500, scalteType, 1024, 500);

        verifyResize(jpeg, 500, 500, scalteType, 1024, 500);

        // Specify only width

        verifyResize(jpeg, 512, 0, scalteType, 512, 250);

        verifyResize(jpeg, 800, 0, scalteType, 800, 390);

        verifyResize(jpeg, 1024, 0, scalteType, 1024, 500);

        // Specify only height

        verifyResize(jpeg, 0, 250, scalteType, 512, 250);

        verifyResize(jpeg, 0, 391, scalteType, 800, 391);

        verifyResize(jpeg, 0, 500, scalteType, 1024, 500);

        // No resize

        verifyResize(jpeg, 0, 0, scalteType, 1024, 500);

        // Scale in X and Y independently, so that src matches dst exactly. This

        // may change the aspect ratio of the src.

        scalteType = ScaleType.FIT_XY;

        // Exact sizes

        verifyResize(jpeg, 512, 250, scalteType, 512, 250);

        verifyResize(jpeg, 511, 249, scalteType, 511, 249);

        verifyResize(jpeg, 1080, 500, scalteType, 1024, 500);

        verifyResize(jpeg, 500, 500, scalteType, 500, 500);

        // Specify only width

        verifyResize(jpeg, 512, 0, scalteType, 512, 500);

        verifyResize(jpeg, 800, 0, scalteType, 800, 500);

        verifyResize(jpeg, 1024, 0, scalteType, 1024, 500);

        // Specify only height

        verifyResize(jpeg, 0, 250, scalteType, 1024, 250);

        verifyResize(jpeg, 0, 391, scalteType, 1024, 391);

        verifyResize(jpeg, 0, 500, scalteType, 1024, 500);

        // No resize

        verifyResize(jpeg, 0, 0, scalteType, 1024, 500);

    }

    private void verifyResize(NetworkResponse networkResponse, int maxWidth, int maxHeight,

                              ScaleType scaleType, int expectedWidth, int expectedHeight) {

        ImageRequest request = new ImageRequest("", null, maxWidth, maxHeight, scaleType,

                Config.RGB_565, null);

        Response<Bitmap> response = request.parseNetworkResponse(networkResponse);

        assertNotNull(response);

        assertTrue(response.isSuccess());

        Bitmap bitmap = response.result;

        assertNotNull(bitmap);

        assertEquals(expectedWidth, bitmap.getWidth());

        assertEquals(expectedHeight, bitmap.getHeight());

    }

    @Test public void findBestSampleSize() {

        // desired == actual == 1

        assertEquals(1, ImageRequest.findBestSampleSize(100, 150, 100, 150));

        // exactly half == 2

        assertEquals(2, ImageRequest.findBestSampleSize(280, 160, 140, 80));

        // just over half == 1

        assertEquals(1, ImageRequest.findBestSampleSize(1000, 800, 501, 401));

        // just under 1/4 == 4

        assertEquals(4, ImageRequest.findBestSampleSize(100, 200, 24, 50));

    }

    private static byte[] readInputStream(InputStream in) throws IOException {

        ByteArrayOutputStream bytes = new ByteArrayOutputStream();

        byte[] buffer = new byte[1024];

        int count;

        while ((count = in.read(buffer)) != -1) {

            bytes.write(buffer, 0, count);

        }

        in.close();

        return bytes.toByteArray();

    }

    @Test

    public void publicMethods() throws Exception {

        // Catch-all test to find API-breaking changes.

        assertNotNull(ImageRequest.class.getConstructor(String.class, Response.Listener.class,

                int.class, int.class, Bitmap.Config.class, Response.ErrorListener.class));

        assertNotNull(ImageRequest.class.getConstructor(String.class, Response.Listener.class,

                int.class, int.class, ImageView.ScaleType.class, Bitmap.Config.class,

                Response.ErrorListener.class));

    }

}