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 * Copyright (c) 1997, 2007, 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
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package sun.java2d.pipe;

import java.awt.BasicStroke;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.PathIterator;
import sun.awt.SunHints;
import sun.java2d.SunGraphics2D;

This class is used to convert raw geometry into 8-bit alpha tiles
using an AATileGenerator for application by the next stage of
the pipeline.
This class sets up the Generator and computes the alpha tiles
and then passes them on to a CompositePipe object for painting.
/**
 * This class is used to convert raw geometry into 8-bit alpha tiles
 * using an AATileGenerator for application by the next stage of
 * the pipeline.
 * This class sets up the Generator and computes the alpha tiles
 * and then passes them on to a CompositePipe object for painting.
 */
public class AAShapePipe implements ShapeDrawPipe {
    static RenderingEngine renderengine = RenderingEngine.getInstance();

    CompositePipe outpipe;

    public AAShapePipe(CompositePipe pipe) {
        outpipe = pipe;
    }

    public void draw(SunGraphics2D sg, Shape s) {
        BasicStroke bs;

        if (sg.stroke instanceof BasicStroke) {
            bs = (BasicStroke) sg.stroke;
        } else {
            s = sg.stroke.createStrokedShape(s);
            bs = null;
        }

        renderPath(sg, s, bs);
    }

    public void fill(SunGraphics2D sg, Shape s) {
        renderPath(sg, s, null);
    }

    private static byte[] theTile;

    public synchronized static byte[] getAlphaTile(int len) {
        byte[] t = theTile;
        if (t == null || t.length < len) {
            t = new byte[len];
        } else {
            theTile = null;
        }
        return t;
    }

    public synchronized static void dropAlphaTile(byte[] t) {
        theTile = t;
    }

    public void renderPath(SunGraphics2D sg, Shape s, BasicStroke bs) {
        boolean adjust = (bs != null &&
                          sg.strokeHint != SunHints.INTVAL_STROKE_PURE);
        boolean thin = (sg.strokeState <= sg.STROKE_THINDASHED);
        Object context = null;
        byte alpha[] = null;

        Region clip = sg.getCompClip();
        int abox[] = new int[4];
        AATileGenerator aatg =
            renderengine.getAATileGenerator(s, sg.transform, clip,
                                            bs, thin, adjust, abox);
        if (aatg == null) {
            // Nothing to render
            return;
        }

        try {
            context = outpipe.startSequence(sg, s,
                                            new Rectangle(abox[0], abox[1],
                                                          abox[2] - abox[0],
                                                          abox[3] - abox[1]),
                                            abox);

            int tw = aatg.getTileWidth();
            int th = aatg.getTileHeight();
            alpha = getAlphaTile(tw * th);

            byte[] atile;

            for (int y = abox[1]; y < abox[3]; y += th) {
                for (int x = abox[0]; x < abox[2]; x += tw) {
                    int w = Math.min(tw, abox[2] - x);
                    int h = Math.min(th, abox[3] - y);

                    int a = aatg.getTypicalAlpha();
                    if (a == 0x00 ||
                        outpipe.needTile(context, x, y, w, h) == false)
                    {
                        aatg.nextTile();
                        outpipe.skipTile(context, x, y);
                        continue;
                    }
                    if (a == 0xff) {
                        atile = null;
                        aatg.nextTile();
                    } else {
                        atile = alpha;
                        aatg.getAlpha(alpha, 0, tw);
                    }

                    outpipe.renderPathTile(context, atile, 0, tw,
                                           x, y, w, h);
                }
            }
        } finally {
            aatg.dispose();
            if (context != null) {
                outpipe.endSequence(context);
            }
            if (alpha != null) {
                dropAlphaTile(alpha);
            }
        }
    }
}