/*
* Copyright (c) 1998, 2002, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package sun.java2d.pipe;
import java.awt.Rectangle;
/**
* 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
* found and recording the low and high X coordinates of
* the range in the array at locations 0 and 2 respectively.
*/
public boolean nextXBand(int range[]) {
if (numXbands <= 0) {
return false;
}
numXbands--;
range[0] = region.bands[curIndex++];
range[2] = region.bands[curIndex++];
return true;
}
}