static {
// getting default hints
final Hints defaultHints = GeoTools.getDefaultHints();
// check if someone asked us to use a specific precision model
final Object o = defaultHints.get(Hints.JTS_PRECISION_MODEL);
final PrecisionModel pm;
if (o != null) pm = (PrecisionModel) o;
else {
pm = new PrecisionModel();
}
GFACTORY = new GeometryFactory(pm, 0);
// Register manually the GTCrop operation, in web containers JAI registration may fails
GTCropDescriptor.register();
}
/**
* Overrides to use the same method to slice the tiles than {@code MetatileMapOutputFormat} so the
* GeoServer settings such as use native accel are leveraged in the same way when calling {@link
* RenderedImageMapResponse#formatImageOutputStream},
*
* @see org.geowebcache.layer.MetaTile#createTile(int, int, int, int)
*/
@Override
public RenderedImage createTile(
final int x, final int y, final int tileWidth, final int tileHeight) {
// check image type
final int type;
if (metaTileImage instanceof PlanarImage) {
type = 1;
} else if (metaTileImage instanceof BufferedImage) {
type = 2;
} else {
type = 0;
}
// now do the splitting
RenderedImage tile;
switch (type) {
case 0:
// do a crop, and then turn it into a buffered image so that we can release
// the image chain
RenderedOp cropped =
GTCropDescriptor.create(
metaTileImage,
Float.valueOf(x),
Float.valueOf(y),
Float.valueOf(tileWidth),
Float.valueOf(tileHeight),
NO_CACHE);
tile = cropped.getAsBufferedImage();
disposeLater(cropped);
break;
case 1:
final PlanarImage pImage = (PlanarImage) metaTileImage;
final WritableRaster wTile =
WritableRaster.createWritableRaster(
pImage.getSampleModel().createCompatibleSampleModel(tileWidth, tileHeight),
new Point(x, y));
Rectangle sourceArea = new Rectangle(x, y, tileWidth, tileHeight);
sourceArea = sourceArea.intersection(pImage.getBounds());
// copying the data to ensure we don't have side effects when we clean the cache
pImage.copyData(wTile);
if (wTile.getMinX() != 0 || wTile.getMinY() != 0) {
tile =
new BufferedImage(
pImage.getColorModel(),
(WritableRaster) wTile.createTranslatedChild(0, 0),
pImage.getColorModel().isAlphaPremultiplied(),
null);
} else {
tile =
new BufferedImage(
pImage.getColorModel(),
wTile,
pImage.getColorModel().isAlphaPremultiplied(),
null);
}
break;
case 2:
final BufferedImage image = (BufferedImage) metaTileImage;
tile = image.getSubimage(x, y, tileWidth, tileHeight);
break;
default:
throw new IllegalStateException(
Errors.format(
ErrorKeys.ILLEGAL_ARGUMENT_$2,
"metaTile class",
metaTileImage.getClass().toString()));
}
return tile;
}