/*

 * 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

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 */

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);

    }

}