/*
* Copyright (c) 1998, 1999, 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;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.PathIterator;
import sun.java2d.SunGraphics2D;
/**
* This class uses a Region iterator to modify the extents of alpha
* tiles created during Shape rendering based upon a non-rectangular
* clipping path.
*/
public class SpanClipRenderer implements CompositePipe
{
CompositePipe outpipe;
static Class RegionClass = Region.class;
static Class RegionIteratorClass = RegionIterator.class;
static {
initIDs(RegionClass, RegionIteratorClass);
}
static native void initIDs(Class rc, Class ric);
public SpanClipRenderer(CompositePipe pipe) {
outpipe = pipe;
}
class SCRcontext {
RegionIterator iterator;
Object outcontext;
int band[];
byte tile[];
public SCRcontext(RegionIterator ri, Object outctx) {
iterator = ri;
outcontext = outctx;
band = new int[4];
}
}
public Object startSequence(SunGraphics2D sg, Shape s, Rectangle devR,
int[] abox) {
RegionIterator ri = sg.clipRegion.getIterator();
return new SCRcontext(ri, outpipe.startSequence(sg, s, devR, abox));
}
public boolean needTile(Object ctx, int x, int y, int w, int h) {
SCRcontext context = (SCRcontext) ctx;
return (outpipe.needTile(context.outcontext, x, y, w, h));
}
public void renderPathTile(Object ctx,
byte[] atile, int offset, int tsize,
int x, int y, int w, int h,
ShapeSpanIterator sr) {
renderPathTile(ctx, atile, offset, tsize, x, y, w, h);
}
public void renderPathTile(Object ctx,
byte[] atile, int offset, int tsize,
int x, int y, int w, int h) {
SCRcontext context = (SCRcontext) ctx;
RegionIterator ri = context.iterator.createCopy();
int[] band = context.band;
band[0] = x;
band[1] = y;
band[2] = x + w;
band[3] = y + h;
if (atile == null) {
int size = w * h;
atile = context.tile;
if (atile != null && atile.length < size) {
atile = null;
}
if (atile == null) {
atile = new byte[size];
context.tile = atile;
}
offset = 0;
tsize = w;
fillTile(ri, atile, offset, tsize, band);
} else {
eraseTile(ri, atile, offset, tsize, band);
}
if (band[2] > band[0] && band[3] > band[1]) {
offset += (band[1] - y) * tsize + (band[0] - x);
outpipe.renderPathTile(context.outcontext,
atile, offset, tsize,
band[0], band[1],
band[2] - band[0],
band[3] - band[1]);
}
}
public native void fillTile(RegionIterator ri,
byte[] alpha, int offset, int tsize,
int[] band);
public native void eraseTile(RegionIterator ri,
byte[] alpha, int offset, int tsize,
int[] band);
public void skipTile(Object ctx, int x, int y) {
SCRcontext context = (SCRcontext) ctx;
outpipe.skipTile(context.outcontext, x, y);
}
public void endSequence(Object ctx) {
SCRcontext context = (SCRcontext) ctx;
outpipe.endSequence(context.outcontext);
}
}