private void testAlphaRGB(boolean direct) {
assertTrue("Assertions should be enabled.", ImageWorker.class.desiredAssertionStatus());
ImageWorker worker = new ImageWorker(getSyntheticRGB(direct));
worker.applyOpacity(0.5f);
RenderedImage image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof ComponentColorModel);
assertTrue(image.getColorModel().hasAlpha());
int sample = image.getTile(0, 0).getSample(0, 0, 3);
assertEquals(128, sample);
}
@Test
public void testOpacityGray() {
assertTrue("Assertions should be enabled.", ImageWorker.class.desiredAssertionStatus());
ImageWorker worker = new ImageWorker(gray);
worker.applyOpacity(0.5f);
RenderedImage image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof ComponentColorModel);
assertTrue(image.getColorModel().hasAlpha());
int sample = image.getTile(0, 0).getSample(0, 0, 1);
assertEquals(128, sample);
}
@Test
public void testOpacityIndexed() {
assertTrue("Assertions should be enabled.", ImageWorker.class.desiredAssertionStatus());
assertFalse(worldDEMImage.getColorModel().hasAlpha());
ImageWorker worker = new ImageWorker(worldDEMImage);
worker.applyOpacity(0.5f);
RenderedImage image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof IndexColorModel);
assertTrue(image.getColorModel().hasAlpha());
// check the resulting palette
IndexColorModel index = (IndexColorModel) image.getColorModel();
for (int i = 0; i < index.getMapSize(); i++) {
assertEquals(128, index.getAlpha(i));
}
}
@Test
public void testOpacityIndexedTranslucent() {
assertTrue("Assertions should be enabled.", ImageWorker.class.desiredAssertionStatus());
assertFalse(worldDEMImage.getColorModel().hasAlpha());
final BufferedImage input = getSyntheticTranslucentIndexed();
ImageWorker worker = new ImageWorker(input);
worker.applyOpacity(0.5f);
RenderedImage image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof IndexColorModel);
assertTrue(image.getColorModel().hasAlpha());
// check the resulting palette
IndexColorModel outputCM = (IndexColorModel) image.getColorModel();
IndexColorModel inputCM = (IndexColorModel) input.getColorModel();
for (int i = 0; i < inputCM.getMapSize(); i++) {
assertEquals(Math.round(inputCM.getAlpha(i) * 0.5), outputCM.getAlpha(i));
}
}
@Test
public void testOpacityGrayAlpha() {
assertTrue("Assertions should be enabled.", ImageWorker.class.desiredAssertionStatus());
ImageWorker worker = new ImageWorker(gray);
worker.applyOpacity(0.5f);
RenderedImage image = worker.getRenderedImage();
assertTrue(image.getColorModel() instanceof ComponentColorModel);
assertTrue(image.getColorModel().hasAlpha());
Raster tile = gray.getTile(0, 0);
Raster outputTile = image.getTile(0, 0);
for (int i = 0; i < tile.getWidth(); i++) {
for (int j = 0; j < tile.getHeight(); j++) {
int original = tile.getSample(i, j, 1);
int result = outputTile.getSample(i, j, 1);
assertEquals(Math.round(original * 0.5), result);
}
}
}