/**
* Creates the {@link RenderedImage} corresponding to the tile at index {@code tileIdx} and uses a
* {@link RenderedImageMapResponse} to encode it into the {@link #getResponseFormat() response
* format}.
*
* @see org.geowebcache.layer.MetaTile#writeTileToStream(int, org.geowebcache.io.Resource)
* @see RenderedImageMapResponse#write
*/
@Override
public boolean writeTileToStream(final int tileIdx, Resource target) throws IOException {
checkNotNull(metaTileMap, "webMap is not set");
if (!(metaTileMap instanceof RenderedImageMap)) {
throw new IllegalArgumentException(
"Only RenderedImageMaps are supported so far: " + metaTileMap.getClass().getName());
}
final RenderedImageMapResponse mapEncoder;
{
final GWC mediator = GWC.get();
final Response responseEncoder = mediator.getResponseEncoder(responseFormat, metaTileMap);
mapEncoder = (RenderedImageMapResponse) responseEncoder;
}
RenderedImage tile = metaTileMap.getImage();
WMSMapContent tileContext = metaTileMap.getMapContext();
if (this.tiles.length > 1 || (this.tiles.length == 1 && metaHasGutter())) {
final Rectangle tileDim = this.tiles[tileIdx];
tile = createTile(tileDim.x, tileDim.y, tileDim.width, tileDim.height);
disposeLater(tile);
{
final WMSMapContent metaTileContext = metaTileMap.getMapContext();
// do not create tileContext with metaTileContext.getLayers() as the layer list.
// It is not needed at this stage and the constructor would force a
// MapLayer.getBounds() that might fail
tileContext = new WMSMapContent();
tileContext.setRequest(metaTileContext.getRequest());
tileContext.setBgColor(metaTileContext.getBgColor());
tileContext.setMapWidth(tileDim.width);
tileContext.setMapHeight(tileDim.height);
tileContext.setPalette(metaTileContext.getPalette());
tileContext.setTransparent(tileContext.isTransparent());
long[][] tileIndexes = getTilesGridPositions();
BoundingBox tileBounds = gridSubset.boundsFromIndex(tileIndexes[tileIdx]);
ReferencedEnvelope tilebbox =
new ReferencedEnvelope(metaTileContext.getCoordinateReferenceSystem());
tilebbox.init(
tileBounds.getMinX(), tileBounds.getMaxX(), tileBounds.getMinY(), tileBounds.getMaxY());
tileContext.getViewport().setBounds(tilebbox);
}
}
OutputStream outStream = target.getOutputStream();
try {
// call formatImageOuputStream instead of write to avoid disposition of rendered images
// when processing a tile from a metatile and instead defer it to this class' dispose()
// method
mapEncoder.formatImageOutputStream(tile, outStream, tileContext);
return true;
} finally {
outStream.close();
}
}
byte[] toBytes(WebMap map) throws IOException {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
if (map instanceof RenderedImageMap) {
RenderedImageMapResponse response =
JPEG_MIME_TYPE.equals(map.getMimeType())
? new JPEGMapResponse(wms)
: new PNGMapResponse(wms);
response.write(map, bout, null);
} else if (map instanceof RawMap) {
((RawMap) map).writeTo(bout);
}
bout.flush();
return bout.toByteArray();
}