/**
* Extract the ImageLayout from the provided reader for the first available image.
*
* @param reader an istance of {@link ImageReader}
* @throws IOException in case an error occurs
*/
protected void setLayout(ImageReader reader) throws IOException {
Utilities.ensureNonNull("reader", reader);
// save ImageLayout
ImageLayout2 layout = new ImageLayout2();
ImageTypeSpecifier its = reader.getImageTypes(0).next();
layout.setColorModel(its.getColorModel()).setSampleModel(its.getSampleModel());
layout.setMinX(0).setMinY(0).setWidth(reader.getWidth(0)).setHeight(reader.getHeight(0));
layout
.setTileGridXOffset(0)
.setTileGridYOffset(0)
.setTileWidth(reader.getTileWidth(0))
.setTileHeight(reader.getTileHeight(0));
setlayout(layout);
}
@Test
// @Ignore
public void nearestExternal() throws Exception {
final OverviewsEmbedder oe = new OverviewsEmbedder();
oe.setDownsampleStep(2);
oe.setNumSteps(5);
oe.setScaleAlgorithm(OverviewsEmbedder.SubsampleAlgorithm.Nearest.toString());
// use default
oe.setTileCache(JAI.getDefaultInstance().getTileCache());
oe.setTileWidth(256);
oe.setTileHeight(256);
oe.setExternalOverviews(true);
oe.setSourcePath(TestData.file(this, "DEM_.tiff").getAbsolutePath());
oe.addProcessingEventListener(
new ProcessingEventListener() {
@Override
public void getNotification(ProcessingEvent event) {
LOGGER.info(event.toString());
}
@Override
public void exceptionOccurred(ExceptionEvent event) {
LOGGER.warning(event.toString());
}
});
oe.run();
// now red it back and check that things are coherent
final ImageReader reader = new TIFFImageReaderSpi().createReaderInstance();
reader.setInput(
ImageIO.createImageInputStream(org.geotools.test.TestData.file(this, "DEM_.tiff")));
assertTrue(reader.getNumImages(true) == 1);
reader.reset();
assertTrue(org.geotools.test.TestData.file(this, "DEM_.tif.ovr").exists());
reader.setInput(
ImageIO.createImageInputStream(org.geotools.test.TestData.file(this, "DEM_.tif.ovr")));
assertTrue(reader.getNumImages(true) == 5);
assertTrue(reader.isImageTiled(0));
assertEquals(256, reader.getTileHeight(0));
assertEquals(256, reader.getTileWidth(0));
reader.dispose();
}