/**
* 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);
}
