/** Tests the {@link ImageWorker#tile()} methods. Some trivial tests are performed before. */
@Test
public void testReTile() {
assertTrue("Assertions should be enabled.", ImageWorker.class.desiredAssertionStatus());
ImageWorker worker = new ImageWorker(worldImage);
assertSame(worldImage, worker.getRenderedImage());
assertEquals(4, worker.getNumBands());
assertEquals(-1, worker.getTransparentPixel());
assertTrue(worker.isBytes());
assertFalse(worker.isBinary());
assertFalse(worker.isIndexed());
assertTrue(worker.isColorSpaceRGB());
assertFalse(worker.isColorSpaceGRAYScale());
assertTrue(worker.isTranslucent());
assertSame("Expected no operation.", worldImage, worker.rescaleToBytes().getRenderedImage());
assertSame(
"Expected no operation.", worldImage, worker.forceComponentColorModel().getRenderedImage());
assertSame(
"Expected no operation.", worldImage, worker.forceColorSpaceRGB().getRenderedImage());
assertSame("Expected no operation.", worldImage, worker.retainBands(4).getRenderedImage());
// Following will change image, so we need to test after the above assertions.
worker.setRenderingHint(
JAI.KEY_IMAGE_LAYOUT,
new ImageLayout()
.setTileGridXOffset(0)
.setTileGridYOffset(0)
.setTileHeight(64)
.setTileWidth(64));
worker.tile();
assertSame("Expected 64.", 64, worker.getRenderedImage().getTileWidth());
assertSame("Expected 64.", 64, worker.getRenderedImage().getTileHeight());
}
/** Tests the {@link #rescaleToBytes()} operation. */
@Test
public void rescaleToBytes() {
assertTrue("Assertions should be enabled.", ImageWorker.class.desiredAssertionStatus());
// set up synthetic images for testing
final RenderedImage test1 =
ConstantDescriptor.create(128.0f, 128.0f, new Double[] {20000.0}, null);
final RenderedImage test2 =
ConstantDescriptor.create(128.0f, 128.0f, new Double[] {255.0}, null);
final RenderedImage test3 = getSynthetic(20000);
final RenderedImage test4 = getSynthetic(255);
// starting to check the results
// single band value exceed the byte upper bound and is constant
final ImageWorker test1I = new ImageWorker(test1).rescaleToBytes();
Assert.assertEquals("Format", test1I.getRenderedOperation().getOperationName());
final double[] maximums1 = test1I.getMaximums();
Assert.assertTrue(maximums1.length == 1);
Assert.assertEquals(255.0, maximums1[0], 1E-10);
final double[] minimums1 = test1I.getMinimums();
Assert.assertTrue(minimums1.length == 1);
Assert.assertEquals(255.0, minimums1[0], 1E-10);
// single band value does not exceed the byte upper bound and is constant
final ImageWorker test2I = new ImageWorker(test2).rescaleToBytes();
Assert.assertEquals("Format", test2I.getRenderedOperation().getOperationName());
final double[] maximums2 = test1I.getMaximums();
Assert.assertTrue(maximums2.length == 1);
Assert.assertEquals(255.0, maximums2[0], 1E-10);
final double[] minimums2 = test1I.getMinimums();
Assert.assertTrue(minimums2.length == 1);
Assert.assertEquals(255.0, minimums2[0], 1E-10);
// single band value exceed the byte upper bound
ImageWorker test3I = new ImageWorker(test3);
final double[] maximums3a = test3I.getMaximums();
final double[] minimums3a = test3I.getMinimums();
test3I.rescaleToBytes();
Assert.assertEquals("Rescale", test3I.getRenderedOperation().getOperationName());
final double[] maximums3b = test3I.getMaximums();
final double[] minimums3b = test3I.getMinimums();
if (maximums3a[0] > 255) {
Assert.assertTrue(Math.abs(maximums3a[0] - maximums3b[0]) > 1E-10);
Assert.assertTrue(Math.abs(255.0 - maximums3b[0]) >= 0);
}
if (minimums3a[0] < 0) {
Assert.assertTrue(minimums3b[0] >= 0);
}
// single band value does not exceed the byte upper bound
ImageWorker test4I = new ImageWorker(test4);
final double[] maximums4a = test4I.getMaximums();
final double[] minimums4a = test4I.getMinimums();
test4I.rescaleToBytes();
Assert.assertEquals("Format", test4I.getRenderedOperation().getOperationName());
final double[] maximums4b = test4I.getMaximums();
final double[] minimums4b = test4I.getMinimums();
Assert.assertEquals(maximums4a[0], maximums4b[0], 1E-10);
Assert.assertEquals(minimums4a[0], minimums4b[0], 1E-10);
// now test multibands case
final RenderedImage multiband = BandMergeDescriptor.create(test2, test3, null);
ImageWorker testmultibandI = new ImageWorker(multiband);
final double[] maximums5a = testmultibandI.getMaximums();
final double[] minimums5a = testmultibandI.getMinimums();
testmultibandI.rescaleToBytes();
final double[] maximums5b = testmultibandI.getMaximums();
final double[] minimums5b = testmultibandI.getMinimums();
Assert.assertEquals(maximums5a[0], maximums5b[0], 1E-10);
Assert.assertEquals(minimums5a[0], minimums5b[0], 1E-10);
Assert.assertTrue(Math.abs(maximums5a[1] - maximums5b[1]) > 1E-10);
Assert.assertTrue(Math.abs(minimums5a[1] - minimums5b[1]) > 1E-10);
}