androidx/palette/graphics/BucketTests.java

/*
 * Copyright 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 androidx.palette.graphics;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.test.filters.SmallTest;
import android.support.test.runner.AndroidJUnit4;

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

import java.util.ArrayList;

@RunWith(AndroidJUnit4.class)
public class BucketTests {

    @Test
    @SmallTest
    public void testSourceBitmapNotRecycled() {
        final Bitmap sample = TestUtils.loadSampleBitmap();

        Palette.from(sample).generate();
        assertFalse(sample.isRecycled());
    }

    @Test(expected = UnsupportedOperationException.class)
    @SmallTest
    public void testSwatchesUnmodifiable() {
        Palette p = Palette.from(TestUtils.loadSampleBitmap()).generate();
        p.getSwatches().remove(0);
    }

    @Test
    @SmallTest
    public void testSwatchesBuilder() {
        ArrayList<Palette.Swatch> swatches = new ArrayList<>();
        swatches.add(new Palette.Swatch(Color.BLACK, 40));
        swatches.add(new Palette.Swatch(Color.GREEN, 60));
        swatches.add(new Palette.Swatch(Color.BLUE, 10));

        Palette p = Palette.from(swatches);

        assertEquals(swatches, p.getSwatches());
    }

    @Test
    @SmallTest
    public void testRegionWhole() {
        final Bitmap sample = TestUtils.loadSampleBitmap();

        Palette.Builder b = new Palette.Builder(sample);
        b.setRegion(0, 0, sample.getWidth(), sample.getHeight());
        b.generate();
    }

    @Test
    @SmallTest
    public void testRegionUpperLeft() {
        final Bitmap sample = TestUtils.loadSampleBitmap();

        Palette.Builder b = new Palette.Builder(sample);
        b.setRegion(0, 0, sample.getWidth() / 2, sample.getHeight() / 2);
        b.generate();
    }

    @Test
    @SmallTest
    public void testRegionBottomRight() {
        final Bitmap sample = TestUtils.loadSampleBitmap();

        Palette.Builder b = new Palette.Builder(sample);
        b.setRegion(sample.getWidth() / 2, sample.getHeight() / 2,
                sample.getWidth(), sample.getHeight());
        b.generate();
    }

    @Test
    @SmallTest
    public void testOnePixelTallBitmap() {
        final Bitmap bitmap = Bitmap.createBitmap(1000, 1, Bitmap.Config.ARGB_8888);

        Palette.Builder b = new Palette.Builder(bitmap);
        b.generate();
    }

    @Test
    @SmallTest
    public void testOnePixelWideBitmap() {
        final Bitmap bitmap = Bitmap.createBitmap(1, 1000, Bitmap.Config.ARGB_8888);

        Palette.Builder b = new Palette.Builder(bitmap);
        b.generate();
    }

    @Test
    @SmallTest
    public void testBlueBitmapReturnsBlueSwatch() {
        final Bitmap bitmap = Bitmap.createBitmap(300, 300, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        canvas.drawColor(Color.BLUE);

        final Palette palette = Palette.from(bitmap).generate();

        assertEquals(1, palette.getSwatches().size());

        final Palette.Swatch swatch = palette.getSwatches().get(0);
        TestUtils.assertCloseColors(Color.BLUE, swatch.getRgb());
    }

    @Test
    @SmallTest
    public void testBlueBitmapWithRegionReturnsBlueSwatch() {
        final Bitmap bitmap = Bitmap.createBitmap(300, 300, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        canvas.drawColor(Color.BLUE);

        final Palette palette = Palette.from(bitmap)
                .setRegion(0, bitmap.getHeight() / 2, bitmap.getWidth(), bitmap.getHeight())
                .generate();

        assertEquals(1, palette.getSwatches().size());

        final Palette.Swatch swatch = palette.getSwatches().get(0);
        TestUtils.assertCloseColors(Color.BLUE, swatch.getRgb());
    }

    @Test
    @SmallTest
    public void testDominantSwatch() {
        final Bitmap bitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);

        // First fill the canvas with blue
        Canvas canvas = new Canvas(bitmap);
        canvas.drawColor(Color.BLUE);

        final Paint paint = new Paint();
        // Now we'll draw the top 10px tall rect with green
        paint.setColor(Color.GREEN);
        canvas.drawRect(0, 0, 100, 10, paint);

        // Now we'll draw the next 20px tall rect with red
        paint.setColor(Color.RED);
        canvas.drawRect(0, 11, 100, 30, paint);

        // Now generate a palette from the bitmap
        final Palette palette = Palette.from(bitmap).generate();

        // First assert that there are 3 swatches
        assertEquals(3, palette.getSwatches().size());

        // Now assert that the dominant swatch is blue
        final Palette.Swatch swatch = palette.getDominantSwatch();
        assertNotNull(swatch);
        TestUtils.assertCloseColors(Color.BLUE, swatch.getRgb());
    }

}