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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
 *
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package sun.java2d.pipe;

import java.awt.BasicStroke;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.Rectangle2D;
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, ParallelogramPipe
{
    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 Rectangle2D computeBBox(double ux1, double uy1,
                                           double ux2, double uy2)
    {
        if ((ux2 -= ux1) < 0) {
            ux1 += ux2;
            ux2 = -ux2;
        }
        if ((uy2 -= uy1) < 0) {
            uy1 += uy2;
            uy2 = -uy2;
        }
        return new Rectangle2D.Double(ux1, uy1, ux2, uy2);
    }

    public void fillParallelogram(SunGraphics2D sg,
                                  double ux1, double uy1,
                                  double ux2, double uy2,
                                  double x, double y,
                                  double dx1, double dy1,
                                  double dx2, double dy2)
    {
        Region clip = sg.getCompClip();
        int abox[] = new int[4];
        AATileGenerator aatg =
            renderengine.getAATileGenerator(x, y, dx1, dy1, dx2, dy2, 0, 0,
                                            clip, abox);
        if (aatg == null) {
            // Nothing to render
            return;
        }

        renderTiles(sg, computeBBox(ux1, uy1, ux2, uy2), aatg, abox);
    }

    public void drawParallelogram(SunGraphics2D sg,
                                  double ux1, double uy1,
                                  double ux2, double uy2,
                                  double x, double y,
                                  double dx1, double dy1,
                                  double dx2, double dy2,
                                  double lw1, double lw2)
    {
        Region clip = sg.getCompClip();
        int abox[] = new int[4];
        AATileGenerator aatg =
            renderengine.getAATileGenerator(x, y, dx1, dy1, dx2, dy2, lw1, lw2,
                                            clip, abox);
        if (aatg == null) {
            // Nothing to render
            return;
        }

        // Note that bbox is of the original shape, not the wide path.
        // This is appropriate for handing to Paint methods...
        renderTiles(sg, computeBBox(ux1, uy1, ux2, uy2), aatg, abox);
    }

    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);

        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;
        }

        renderTiles(sg, s, aatg, abox);
    }

    public void renderTiles(SunGraphics2D sg, Shape s,
                            AATileGenerator aatg, int abox[])
    {
        Object context = null;
        byte alpha[] = null;
        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);
            }
        }
    }
}