/**
* Generates a trimmed tileset image from the supplied source tileset. The source tileset must be
* configured with an image provider so that the tile images can be obtained. The tile images will
* be trimmed and a new tileset image generated and written to the <code>destImage</code> output
* stream argument.
*
* @param source the source tileset.
* @param destImage an output stream to which the new trimmed image will be written.
* @param tmr a callback object that will be used to inform the caller of the trimmed tile
* metrics.
* @param imgFormat the format in which to write the image file - or if null, use FastImageIO.
*/
public static void trimTileSet(
TileSet source, OutputStream destImage, TrimMetricsReceiver tmr, String imgFormat)
throws IOException {
int tcount = source.getTileCount();
BufferedImage[] timgs = new BufferedImage[tcount];
// these will contain the bounds of the trimmed image in the
// coordinate system defined by the untrimmed image
Rectangle[] tbounds = new Rectangle[tcount];
// compute some tile metrics
int nextx = 0, maxy = 0;
for (int ii = 0; ii < tcount; ii++) {
// extract the image from the original tileset
try {
timgs[ii] = source.getRawTileImage(ii);
} catch (RasterFormatException rfe) {
throw new IOException(
"Failed to get tile image "
+ "[tidx="
+ ii
+ ", tset="
+ source
+ ", rfe="
+ rfe
+ "].");
}
// figure out how tightly we can trim it
tbounds[ii] = new Rectangle();
ImageUtil.computeTrimmedBounds(timgs[ii], tbounds[ii]);
// let our caller know what we did
tmr.trimmedTile(
ii, nextx, 0, tbounds[ii].x, tbounds[ii].y, tbounds[ii].width, tbounds[ii].height);
// adjust the new tileset image dimensions
maxy = Math.max(maxy, tbounds[ii].height);
nextx += tbounds[ii].width;
}
// create the new tileset image
BufferedImage image = null;
try {
image = ImageUtil.createCompatibleImage(source.getRawTileSetImage(), nextx, maxy);
} catch (RasterFormatException rfe) {
throw new IOException(
"Failed to create trimmed tileset image "
+ "[wid="
+ nextx
+ ", hei="
+ maxy
+ ", tset="
+ source
+ ", rfe="
+ rfe
+ "].");
}
// copy the tile data
WritableRaster drast = image.getRaster();
int xoff = 0;
for (int ii = 0; ii < tcount; ii++) {
Rectangle tb = tbounds[ii];
Raster srast = timgs[ii].getRaster().createChild(tb.x, tb.y, tb.width, tb.height, 0, 0, null);
drast.setRect(xoff, 0, srast);
xoff += tb.width;
}
if (destImage != null) {
// write out trimmed image
if (imgFormat == null || FastImageIO.FILE_SUFFIX.equals(imgFormat)) {
FastImageIO.write(image, destImage);
} else {
ImageIO.write(image, imgFormat, destImage);
}
}
}
