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* particular file as subject to the "Classpath" exception as provided
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*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package sun.java2d.pipe;
/**
* This class defines the API for iterating through the bands
* of a region object.
*/
public class RegionIterator {
Region region;
int curIndex;
int numXbands;
RegionIterator(Region r) {
region = r;
}
/**
* Returns a new RegionIterator object representing the same
* iteration state as this object to allow multiple iteration
* branches from the current position.
*/
public RegionIterator createCopy() {
RegionIterator r = new RegionIterator(region);
r.curIndex = this.curIndex;
r.numXbands = this.numXbands;
return r;
}
/**
* Copies the iteration state from this RegionIterator object
* into another RegionIterator object to allow multiple iteration
* branches from the current position.
*/
public void copyStateFrom(RegionIterator ri) {
if (this.region != ri.region) {
throw new InternalError("region mismatch");
}
this.curIndex = ri.curIndex;
this.numXbands = ri.numXbands;
}
/**
* Moves the iteration state to the beginning of the next
* Y range in the region returning true if one is found
* and recording the low and high Y coordinates of the
* range in the array at locations 1 and 3 respectively.
*/
public boolean nextYRange(int[] range) {
curIndex += numXbands * 2;
numXbands = 0;
if (curIndex >= region.endIndex) {
return false;
}
range[1] = region.bands[curIndex++];
range[3] = region.bands[curIndex++];
numXbands = region.bands[curIndex++];
return true;
}
/**
* Moves the iteration state to the beginning of the next
* X band in the current Y range returning true if one is
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