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	/*
	* Copyright (c) 1997, 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;

	import java.awt.BasicStroke;
	import java.awt.Rectangle;
	import java.awt.Shape;
	import java.awt.geom.Rectangle2D;
	import java.util.concurrent.ConcurrentLinkedQueue;
	import sun.awt.SunHints;
	import sun.java2d.ReentrantContext;
	import sun.java2d.ReentrantContextProvider;
	import sun.java2d.ReentrantContextProviderTL;
	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.
	*/
	public final class AAShapePipe
	implements ShapeDrawPipe, ParallelogramPipe
	{
	static final RenderingEngine renderengine = RenderingEngine.getInstance();

	// Per-thread TileState (~1K very small so do not use any Weak Reference)
	private static final ReentrantContextProvider<TileState> tileStateProvider =
	new ReentrantContextProviderTL<TileState>(
	ReentrantContextProvider.REF_HARD)
	{
	@Override
	protected TileState newContext() {
	return new TileState();
	}
	};

	final CompositePipe outpipe;

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

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

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

	renderPath(sg, s, bs);
	}

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

	@Override
	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)
	{
	final TileState ts = tileStateProvider.acquire();
	try {
	final int[] abox = ts.abox;

	final AATileGenerator aatg =
	renderengine.getAATileGenerator(x, y, dx1, dy1, dx2, dy2, 0, 0,
	sg.getCompClip(), abox);
	if (aatg != null) {
	renderTiles(sg, ts.computeBBox(ux1, uy1, ux2, uy2),
	aatg, abox, ts);
	}
	} finally {
	tileStateProvider.release(ts);
	}
	}

	@Override
	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)
	{
	final TileState ts = tileStateProvider.acquire();
	try {
	final int[] abox = ts.abox;

	final AATileGenerator aatg =
	renderengine.getAATileGenerator(x, y, dx1, dy1, dx2, dy2, lw1,
	lw2, sg.getCompClip(), abox);
	if (aatg != null) {
	// Note that bbox is of the original shape, not the wide path.
	// This is appropriate for handing to Paint methods...
	renderTiles(sg, ts.computeBBox(ux1, uy1, ux2, uy2),
	aatg, abox, ts);
	}
	} finally {
	tileStateProvider.release(ts);
	}
	}

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

	final TileState ts = tileStateProvider.acquire();
	try {
	final int[] abox = ts.abox;

	final AATileGenerator aatg =
	renderengine.getAATileGenerator(s, sg.transform, sg.getCompClip(),
	bs, thin, adjust, abox);
	if (aatg != null) {
	renderTiles(sg, s, aatg, abox, ts);
	}
	} finally {
	tileStateProvider.release(ts);
	}
	}

	public void renderTiles(SunGraphics2D sg, Shape s,
	final AATileGenerator aatg,
	final int[] abox, final TileState ts)
	{
	Object context = null;
	try {
	// reentrance: outpipe may also use AAShapePipe:
	context = outpipe.startSequence(sg, s,
	ts.computeDevBox(abox),
	abox);

	// copy of int[] abox as local variables for performance:
	final int x0 = abox[0];
	final int y0 = abox[1];
	final int x1 = abox[2];
	final int y1 = abox[3];

	final int tw = aatg.getTileWidth();
	final int th = aatg.getTileHeight();

	// get tile from thread local storage:
	final byte[] alpha = ts.getAlphaTile(tw * th);
	byte[] atile;

	for (int y = y0; y < y1; y += th) {
	final int h = Math.min(th, y1 - y);

	for (int x = x0; x < x1; x += tw) {
	final int w = Math.min(tw, x1 - x);

	final int a = aatg.getTypicalAlpha();

	if (a == 0x00 \|\| !outpipe.needTile(context, x, y, w, h)) {
	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);
	}
	}
	}

	// Tile state used by AAShapePipe
	static final class TileState extends ReentrantContext {
	// cached tile (32 x 32 tile by default)
	private byte[] theTile = new byte[32 * 32];
	// dirty aabox array
	final int[] abox = new int[4];
	// dirty bbox rectangle
	private final Rectangle dev = new Rectangle();
	// dirty bbox rectangle2D.Double
	private final Rectangle2D.Double bbox2D = new Rectangle2D.Double();

	byte[] getAlphaTile(int len) {
	byte[] t = theTile;
	if (t.length < len) {
	// create a larger tile and may free current theTile (too small)
	theTile = t = new byte[len];
	}
	return t;
	}

	Rectangle computeDevBox(final int[] abox) {
	final Rectangle box = this.dev;
	box.x = abox[0];
	box.y = abox[1];
	box.width = abox[2] - abox[0];
	box.height = abox[3] - abox[1];
	return box;
	}

	Rectangle2D computeBBox(double ux1, double uy1,
	double ux2, double uy2)
	{
	if ((ux2 -= ux1) < 0.0) {
	ux1 += ux2;
	ux2 = -ux2;
	}
	if ((uy2 -= uy1) < 0.0) {
	uy1 += uy2;
	uy2 = -uy2;
	}
	final Rectangle2D.Double box = this.bbox2D;
	box.x = ux1;
	box.y = uy1;
	box.width = ux2;
	box.height = uy2;
	return box;
	}
	}
	}

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