Showing the changes to java/pkg/sun/java2d/pipe/RegionIterator.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,101 @@ | ||
| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2002, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.java2d.pipe; | |
| 27 | + | |
| 28 | +import java.awt.Rectangle; | |
| 29 | + | |
| 30 | +/** | |
| 31 | + * This class defines the API for iterating through the bands | |
| 32 | + * of a region object. | |
| 33 | + */ | |
| 34 | +public class RegionIterator { | |
| 35 | + Region region; | |
| 36 | + int curIndex; | |
| 37 | + int numXbands; | |
| 38 | + | |
| 39 | + RegionIterator(Region r) { | |
| 40 | + region = r; | |
| 41 | + } | |
| 42 | + | |
| 43 | + /** | |
| 44 | + * Returns a new RegionIterator object representing the same | |
| 45 | + * iteration state as this object to allow multiple iteration | |
| 46 | + * branches from the current position. | |
| 47 | + */ | |
| 48 | + public RegionIterator createCopy() { | |
| 49 | + RegionIterator r = new RegionIterator(region); | |
| 50 | + r.curIndex = this.curIndex; | |
| 51 | + r.numXbands = this.numXbands; | |
| 52 | + return r; | |
| 53 | + } | |
| 54 | + | |
| 55 | + /** | |
| 56 | + * Copies the iteration state from this RegionIterator object | |
| 57 | + * into another RegionIterator object to allow multiple iteration | |
| 58 | + * branches from the current position. | |
| 59 | + */ | |
| 60 | + public void copyStateFrom(RegionIterator ri) { | |
| 61 | + if (this.region != ri.region) { | |
| 62 | + throw new InternalError("region mismatch"); | |
| 63 | + } | |
| 64 | + this.curIndex = ri.curIndex; | |
| 65 | + this.numXbands = ri.numXbands; | |
| 66 | + } | |
| 67 | + | |
| 68 | + /** | |
| 69 | + * Moves the iteration state to the beginning of the next | |
| 70 | + * Y range in the region returning true if one is found | |
| 71 | + * and recording the low and high Y coordinates of the | |
| 72 | + * range in the array at locations 1 and 3 respectively. | |
| 73 | + */ | |
| 74 | + public boolean nextYRange(int range[]) { | |
| 75 | + curIndex += numXbands * 2; | |
| 76 | + numXbands = 0; | |
| 77 | + if (curIndex >= region.endIndex) { | |
| 78 | + return false; | |
| 79 | + } | |
| 80 | + range[1] = region.bands[curIndex++]; | |
| 81 | + range[3] = region.bands[curIndex++]; | |
| 82 | + numXbands = region.bands[curIndex++]; | |
| 83 | + return true; | |
| 84 | + } | |
| 85 | + | |
| 86 | + /** | |
| 87 | + * Moves the iteration state to the beginning of the next | |
| 88 | + * X band in the current Y range returning true if one is | |
| 89 | + * found and recording the low and high X coordinates of | |
| 90 | + * the range in the array at locations 0 and 2 respectively. | |
| 91 | + */ | |
| 92 | + public boolean nextXBand(int range[]) { | |
| 93 | + if (numXbands <= 0) { | |
| 94 | + return false; | |
| 95 | + } | |
| 96 | + numXbands--; | |
| 97 | + range[0] = region.bands[curIndex++]; | |
| 98 | + range[2] = region.bands[curIndex++]; | |
| 99 | + return true; | |
| 100 | + } | |
| 101 | +} | |