| /* |
| * Copyright (c) 1998, 2016, 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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 |
| * 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; |
| } |
| } |