/**
* Tests capability to write GIF image.
*
* @throws IOException If an error occured while writting the image.
*/
@Test
public void testGIFImageWrite() throws IOException {
assertTrue("Assertions should be enabled.", ImageWorker.class.desiredAssertionStatus());
// Get the image of the world with transparency.
ImageWorker worker = new ImageWorker(worldDEMImage);
show(worker, "Input GIF");
RenderedImage image = worker.getRenderedImage();
ColorModel cm = image.getColorModel();
assertTrue("wrong color model", cm instanceof IndexColorModel);
assertEquals("wrong transparency model", Transparency.OPAQUE, cm.getTransparency());
// Writes it out as GIF on a file using index color model with
final File outFile = TestData.temp(this, "temp.gif");
worker.writeGIF(outFile, "LZW", 0.75f);
// Read it back
final ImageWorker readWorker = new ImageWorker(ImageIO.read(outFile));
show(readWorker, "GIF to file");
image = readWorker.getRenderedImage();
cm = image.getColorModel();
assertTrue("wrong color model", cm instanceof IndexColorModel);
assertEquals("wrong transparency model", Transparency.OPAQUE, cm.getTransparency());
// Write on an output streams.
final OutputStream os = new FileOutputStream(outFile);
worker = new ImageWorker(worldImage);
worker.forceIndexColorModelForGIF(true);
worker.writeGIF(os, "LZW", 0.75f);
// Read it back.
readWorker.setImage(ImageIO.read(outFile));
show(readWorker, "GIF to output stream");
image = readWorker.getRenderedImage();
cm = image.getColorModel();
assertTrue("wrong color model", cm instanceof IndexColorModel);
assertEquals("wrong transparency model", Transparency.BITMASK, cm.getTransparency());
assertEquals(
"wrong transparent color index", 255, ((IndexColorModel) cm).getTransparentPixel());
outFile.delete();
}
@Test
public void test16BitGIF() throws Exception {
// the resource has been compressed since the palette is way larger than the image itself,
// and the palette does not get compressed
InputStream gzippedStream =
ImageWorkerTest.class.getResource("test-data/sf-sfdem.tif.gz").openStream();
GZIPInputStream is = new GZIPInputStream(gzippedStream);
try {
ImageInputStream iis = ImageIO.createImageInputStream(is);
ImageReader reader = new TIFFImageReaderSpi().createReaderInstance(iis);
reader.setInput(iis);
BufferedImage bi = reader.read(0);
if (TestData.isInteractiveTest()) {
ImageIOUtilities.visualize(bi, "before");
}
reader.dispose();
iis.close();
IndexColorModel icm = (IndexColorModel) bi.getColorModel();
assertEquals(65536, icm.getMapSize());
final File outFile = TestData.temp(this, "temp.gif");
ImageWorker worker = new ImageWorker(bi);
worker.writeGIF(outFile, "LZW", 0.75f);
// Read it back.
bi = ImageIO.read(outFile);
if (TestData.isInteractiveTest()) {
ImageIOUtilities.visualize(bi, "after");
}
ColorModel cm = bi.getColorModel();
assertTrue("wrong color model", cm instanceof IndexColorModel);
assertEquals("wrong transparency model", Transparency.OPAQUE, cm.getTransparency());
final IndexColorModel indexColorModel = (IndexColorModel) cm;
assertEquals("wrong transparent color index", -1, indexColorModel.getTransparentPixel());
assertEquals("wrong component size", 8, indexColorModel.getComponentSize(0));
outFile.delete();
} finally {
is.close();
}
}