/**
* Tests the {@link ImageWorker#makeColorTransparent} methods. Some trivial tests are performed
* before.
*
* @throws IOException
* @throws FileNotFoundException
* @throws IllegalStateException
*/
@Test
public void testMakeColorTransparent()
throws IllegalStateException, FileNotFoundException, IOException {
assertTrue("Assertions should be enabled.", ImageWorker.class.desiredAssertionStatus());
ImageWorker worker = new ImageWorker(sstImage);
assertSame(sstImage, worker.getRenderedImage());
assertEquals(1, worker.getNumBands());
assertEquals(-1, worker.getTransparentPixel());
assertTrue(worker.isBytes());
assertFalse(worker.isBinary());
assertTrue(worker.isIndexed());
assertTrue(worker.isColorSpaceRGB());
assertFalse(worker.isColorSpaceGRAYScale());
assertFalse(worker.isTranslucent());
assertSame(
"Expected no operation.", sstImage, worker.forceIndexColorModel(false).getRenderedImage());
assertSame(
"Expected no operation.", sstImage, worker.forceIndexColorModel(true).getRenderedImage());
assertSame("Expected no operation.", sstImage, worker.forceColorSpaceRGB().getRenderedImage());
assertSame("Expected no operation.", sstImage, worker.retainFirstBand().getRenderedImage());
assertSame("Expected no operation.", sstImage, worker.retainLastBand().getRenderedImage());
// Following will change image, so we need to test after the above assertions.
assertEquals(0, worker.getMinimums()[0], 0);
assertEquals(255, worker.getMaximums()[0], 0);
assertNotSame(sstImage, worker.getRenderedImage());
assertSame(
"Expected same databuffer, i.e. pixels should not be duplicated.",
sstImage.getTile(0, 0).getDataBuffer(),
worker.getRenderedImage().getTile(0, 0).getDataBuffer());
assertSame(worker, worker.makeColorTransparent(Color.WHITE));
assertEquals(255, worker.getTransparentPixel());
assertFalse(worker.isTranslucent());
assertSame(
"Expected same databuffer, i.e. pixels should not be duplicated.",
sstImage.getTile(0, 0).getDataBuffer(),
worker.getRenderedImage().getTile(0, 0).getDataBuffer());
// INDEX TO INDEX-ALPHA
worker = new ImageWorker(chlImage).makeColorTransparent(Color.black);
show(worker, "CHL01195.png");
assertEquals(1, worker.getNumBands());
assertEquals(0, worker.getTransparentPixel());
assertTrue(worker.isBytes());
assertTrue(worker.isIndexed());
assertTrue(worker.isColorSpaceRGB());
assertFalse(worker.isColorSpaceGRAYScale());
assertFalse(worker.isTranslucent());
RenderedImage image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof IndexColorModel);
IndexColorModel iColorModel = (IndexColorModel) image.getColorModel();
int transparentColor = iColorModel.getRGB(worker.getTransparentPixel()) & 0x00ffffff;
assertTrue(transparentColor == 0);
// INDEX TO INDEX-ALPHA
worker = new ImageWorker(bathy).makeColorTransparent(Color.WHITE);
show(worker, "BATHY.png");
assertEquals(1, worker.getNumBands());
assertEquals(206, worker.getTransparentPixel());
assertTrue(worker.isBytes());
assertTrue(worker.isIndexed());
assertTrue(worker.isColorSpaceRGB());
assertFalse(worker.isColorSpaceGRAYScale());
assertFalse(worker.isTranslucent());
image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof IndexColorModel);
iColorModel = (IndexColorModel) image.getColorModel();
transparentColor = iColorModel.getRGB(worker.getTransparentPixel()) & 0x00ffffff;
assertTrue(transparentColor == (Color.WHITE.getRGB() & 0x00ffffff));
// RGB TO RGBA
worker = new ImageWorker(smallWorld).makeColorTransparent(new Color(11, 10, 50));
show(worker, "small_world.png");
assertEquals(4, worker.getNumBands());
assertEquals(-1, worker.getTransparentPixel());
assertTrue(worker.isBytes());
assertFalse(worker.isIndexed());
assertTrue(worker.isColorSpaceRGB());
assertFalse(worker.isColorSpaceGRAYScale());
assertTrue(worker.isTranslucent());
image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof ComponentColorModel);
// RGBA to RGBA
worker = new ImageWorker(worldImage).makeColorTransparent(Color.white);
show(worker, "world.png");
assertEquals(4, worker.getNumBands());
assertEquals(-1, worker.getTransparentPixel());
assertTrue(worker.isBytes());
assertFalse(worker.isIndexed());
assertTrue(worker.isColorSpaceRGB());
assertFalse(worker.isColorSpaceGRAYScale());
assertTrue(worker.isTranslucent());
image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof ComponentColorModel);
// GRAY TO GRAY-ALPHA
worker = new ImageWorker(gray).makeColorTransparent(Color.black);
show(worker, "gray.png");
assertEquals(2, worker.getNumBands());
assertEquals(-1, worker.getTransparentPixel());
assertTrue(worker.isBytes());
assertFalse(worker.isIndexed());
assertFalse(worker.isColorSpaceRGB());
assertTrue(worker.isColorSpaceGRAYScale());
assertTrue(worker.isTranslucent());
image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof ComponentColorModel);
// GRAY-ALPHA TO GRAY-ALPHA.
worker = new ImageWorker(grayAlpha).makeColorTransparent(Color.black);
show(worker, "gray-alpha.png");
assertEquals(2, worker.getNumBands());
assertEquals(-1, worker.getTransparentPixel());
assertTrue(worker.isBytes());
assertFalse(worker.isIndexed());
assertFalse(worker.isColorSpaceRGB());
assertTrue(worker.isColorSpaceGRAYScale());
assertTrue(worker.isTranslucent());
image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof ComponentColorModel);
}
/** 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);
}