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/*
* Copyright 2014 ZXing authors
*
* 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.google.zxing;
import org.junit.Assert;
import org.junit.Test;
/**
* Tests {@link GrayscaleLuminanceSource}.
*/
public final class GrayscaleLuminanceSourceTestCase extends Assert {
private static final GrayscaleLuminanceSource SOURCE =
new GrayscaleLuminanceSource(3, 3, new byte[] {
0x00, 0x7F, (byte) 0xFF,
0x3F, 0x7F, 0x3F,
0x3F, 0x7F, 0x3F});
@Test
public void testCrop() {
assertTrue(SOURCE.isCropSupported());
LuminanceSource cropped = SOURCE.crop(1, 1, 1, 1);
assertEquals(1, cropped.getHeight());
assertEquals(1, cropped.getWidth());
assertArrayEquals(new byte[] { 0x7F }, cropped.getRow(0, null));
}
@Test
public void testRotate() {
assertTrue(SOURCE.isRotateSupported());
assertArrayEquals(new byte[] { 0x00, 0x7F, (byte) 0xFF}, SOURCE.getRow(0, null));
assertArrayEquals(new byte[] { 0x3F, 0x7F, 0x3F}, SOURCE.getRow(1, null));
assertArrayEquals(new byte[] { 0x3F, 0x7F, 0x3F}, SOURCE.getRow(2, null));
LuminanceSource rot90 = SOURCE.rotateCounterClockwise();
assertArrayEquals(new byte[] { (byte) 0xFF, 0x3F, 0x3F}, rot90.getRow(0, null));
assertArrayEquals(new byte[] { 0x7F, 0x7F, 0x7F}, rot90.getRow(1, null));
assertArrayEquals(new byte[] { 0x00, 0x3F, 0x3F}, rot90.getRow(2, null));
LuminanceSource rot180 = rot90.rotateCounterClockwise();
assertArrayEquals(new byte[] { 0x3F, 0x7F, 0x3F}, rot180.getRow(0, null));
assertArrayEquals(new byte[] { 0x3F, 0x7F, 0x3F}, rot180.getRow(1, null));
assertArrayEquals(new byte[] { (byte) 0xFF, 0x7F, 0x00}, rot180.getRow(2, null));
LuminanceSource rot270 = rot180.rotateCounterClockwise();
assertArrayEquals(new byte[] { 0x3F, 0x3F, 0x00}, rot270.getRow(0, null));
assertArrayEquals(new byte[] { 0x7F, 0x7F, 0x7F}, rot270.getRow(1, null));
assertArrayEquals(new byte[] { 0x3F, 0x3F, (byte) 0xFF}, rot270.getRow(2, null));
LuminanceSource rot360 = rot270.rotateCounterClockwise();
assertArrayEquals(new byte[] { 0x00, 0x7F, (byte) 0xFF}, rot360.getRow(0, null));
assertArrayEquals(new byte[] { 0x3F, 0x7F, 0x3F}, rot360.getRow(1, null));
assertArrayEquals(new byte[] { 0x3F, 0x7F, 0x3F}, rot360.getRow(2, null));
assertArrayEquals(SOURCE.getMatrix(), rot360.getMatrix());
}
@Test
public void testRotateCropped() {
assertTrue(SOURCE.isCropSupported());
assertTrue(SOURCE.isRotateSupported());
LuminanceSource cropped = SOURCE.crop(1, 1, 2, 2);
assertArrayEquals(new byte[] { 0x7F, 0x3F}, cropped.getRow(0, null));
assertArrayEquals(new byte[] { 0x7F, 0x3F}, cropped.getRow(1, null));
LuminanceSource rot90 = cropped.rotateCounterClockwise();
assertArrayEquals(new byte[] { 0x3F, 0x3F}, rot90.getRow(0, null));
assertArrayEquals(new byte[] { 0x7F, 0x7F}, rot90.getRow(1, null));
LuminanceSource rot180 = rot90.rotateCounterClockwise();
assertArrayEquals(new byte[] { 0x3F, 0x7F}, rot180.getRow(0, null));
assertArrayEquals(new byte[] { 0x3F, 0x7F}, rot180.getRow(1, null));
LuminanceSource rot270 = rot180.rotateCounterClockwise();
assertArrayEquals(new byte[] { 0x7F, 0x7F}, rot270.getRow(0, null));
assertArrayEquals(new byte[] { 0x3F, 0x3F}, rot270.getRow(1, null));
LuminanceSource rot360 = rot270.rotateCounterClockwise();
assertArrayEquals(new byte[] { 0x7F, 0x3F}, rot360.getRow(0, null));
assertArrayEquals(new byte[] { 0x7F, 0x3F}, rot360.getRow(1, null));
assertArrayEquals(cropped.getMatrix(), rot360.getMatrix());
}
@Test
public void testMatrix() {
assertArrayEquals(new byte[] { 0x00, 0x7F, (byte) 0xFF, 0x3F, 0x7F, 0x3F, 0x3F, 0x7F, 0x3F },
SOURCE.getMatrix());
LuminanceSource croppedFullWidth = SOURCE.crop(0, 1, 3, 2);
assertArrayEquals(new byte[] { 0x3F, 0x7F, 0x3F, 0x3F, 0x7F, 0x3F },
croppedFullWidth.getMatrix());
LuminanceSource croppedCorner = SOURCE.crop(1, 1, 2, 2);
assertArrayEquals(new byte[] { 0x7F, 0x3F, 0x7F, 0x3F },
croppedCorner.getMatrix());
}
@Test
public void testGetRow() {
assertArrayEquals(new byte[] { 0x3F, 0x7F, 0x3F }, SOURCE.getRow(2, new byte[3]));
}
@Test
public void testToString() {
assertEquals("#+ \n#+#\n#+#\n", SOURCE.toString());
}
@Test(expected = IllegalArgumentException.class)
public void testNegativeCrop() {
SOURCE.crop(-1, 0, 3, 3);
}
@Test(expected = IllegalArgumentException.class)
public void testOverflowCrop() {
SOURCE.crop(1, 0, Integer.MAX_VALUE, 3);
}
@Test(expected = IllegalArgumentException.class)
public void testNullPixelArray() {
// Test regression: null pixel array should throw IllegalArgumentException
new RGBLuminanceSource(3, 3, null);
}
@Test(expected = IllegalArgumentException.class)
public void testPixelArrayTooSmall() {
// Test regression: pixel array smaller than width * height should throw IllegalArgumentException
int width = 3;
int height = 3;
int[] pixels = new int[width * height - 1]; // One pixel short
new RGBLuminanceSource(width, height, pixels);
}
}
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