mirror of
https://github.com/openjdk/jdk.git
synced 2026-01-30 21:18:25 +00:00
101 lines
3.3 KiB
Java
101 lines
3.3 KiB
Java
/*
|
|
* 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;
|
|
}
|
|
}
|