| /* |
| * Copyright (c) 1998, 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.geom.PathIterator; |
| import java.awt.Rectangle; |
| import sun.awt.geom.PathConsumer2D; |
| |
| /** |
| * This class can iterate individual span elements generated by scan |
| * converting a Shape. |
| * This particular implementation flattens the incoming path and then |
| * performs simple polygon tracing to calculate the spans. |
| * |
| * Note that this class holds pointers to native data which must be |
| * disposed. It is not marked as finalizable since it is intended |
| * to be very lightweight and finalization is a comparitively expensive |
| * procedure. The caller must specifically use try{} finally{} to |
| * manually ensure that the object is disposed after use, otherwise |
| * native data structures might be leaked. |
| * |
| * Here is a code sample for using this class: |
| * |
| * public void fillShape(Shape s, Rectangle clipRect) { |
| * ShapeSpanIterator ssi = new ShapeSpanIterator(false); |
| * try { |
| * ssi.setOutputArea(clipRect); |
| * ssi.appendPath(s.getPathIterator(null)); |
| * int spanbox[] = new int[4]; |
| * while (ssi.nextSpan(spanbox)) { |
| * int x = spanbox[0]; |
| * int y = spanbox[1]; |
| * int w = spanbox[2] - x; |
| * int h = spanbox[3] - y; |
| * fillRect(x, y, w, h); |
| * } |
| * } finally { |
| * ssi.dispose(); |
| * } |
| * } |
| */ |
| public final class ShapeSpanIterator |
| implements SpanIterator, PathConsumer2D |
| { |
| long pData; |
| |
| static { |
| initIDs(); |
| } |
| |
| public static native void initIDs(); |
| |
| public ShapeSpanIterator(boolean adjust) { |
| setNormalize(adjust); |
| } |
| |
| /* |
| * Appends the geometry and winding rule from the indicated |
| * path iterator. |
| */ |
| public void appendPath(PathIterator pi) { |
| float coords[] = new float[6]; |
| |
| setRule(pi.getWindingRule()); |
| while (!pi.isDone()) { |
| addSegment(pi.currentSegment(coords), coords); |
| pi.next(); |
| } |
| pathDone(); |
| } |
| |
| /* |
| * Appends the geometry from the indicated set of polygon points. |
| */ |
| public native void appendPoly(int xPoints[], int yPoints[], int nPoints, |
| int xoff, int yoff); |
| |
| /* |
| * Sets the normalization flag so that incoming data is |
| * adjusted to nearest (0.25, 0.25) subpixel position. |
| */ |
| private native void setNormalize(boolean adjust); |
| |
| /* |
| * Sets the rectangle of interest for storing and returning |
| * span segments. |
| */ |
| public void setOutputAreaXYWH(int x, int y, int w, int h) { |
| setOutputAreaXYXY(x, y, Region.dimAdd(x, w), Region.dimAdd(y, h)); |
| } |
| |
| /* |
| * Sets the rectangle of interest for storing and returning |
| * span segments. |
| */ |
| public native void setOutputAreaXYXY(int lox, int loy, int hix, int hiy); |
| |
| /* |
| * Sets the rectangle of interest for storing and returning |
| * span segments to the specified Rectangle. |
| */ |
| public void setOutputArea(Rectangle r) { |
| setOutputAreaXYWH(r.x, r.y, r.width, r.height); |
| } |
| |
| /* |
| * Sets the rectangle of interest for storing and returning |
| * span segments to the bounds of the specified Region. |
| */ |
| public void setOutputArea(Region r) { |
| setOutputAreaXYXY(r.getLoX(), r.getLoY(), r.getHiX(), r.getHiY()); |
| } |
| |
| /* |
| * Sets the winding rule in the native data structures. |
| */ |
| public native void setRule(int rule); |
| |
| /* |
| * Adds a single PathIterator segment to the internal list of |
| * path element structures. |
| */ |
| public native void addSegment(int type, float coords[]); |
| |
| /* |
| * Gets the bbox of the available path segments, clipped to the |
| * OutputArea. |
| */ |
| public native void getPathBox(int pathbox[]); |
| |
| /* |
| * Intersects the path box with the given bbox. |
| * Returned spans are clipped to this region, or discarded |
| * altogether if they lie outside it. |
| */ |
| public native void intersectClipBox(int lox, int loy, int hix, int hiy); |
| |
| /* |
| * Fetches the next span that needs to be operated on. |
| * If the return value is false then there are no more spans. |
| */ |
| public native boolean nextSpan(int spanbox[]); |
| |
| /** |
| * This method tells the iterator that it may skip all spans |
| * whose Y range is completely above the indicated Y coordinate. |
| */ |
| public native void skipDownTo(int y); |
| |
| /** |
| * This method returns a native pointer to a function block that |
| * can be used by a native method to perform the same iteration |
| * cycle that the above methods provide while avoiding upcalls to |
| * the Java object. |
| * The definition of the structure whose pointer is returned by |
| * this method is defined in: |
| * <pre> |
| * src/share/native/sun/java2d/pipe/SpanIterator.h |
| * </pre> |
| */ |
| public native long getNativeIterator(); |
| |
| /* |
| * Cleans out all internal data structures. |
| */ |
| public native void dispose(); |
| |
| public native void moveTo(float x, float y); |
| public native void lineTo(float x, float y); |
| public native void quadTo(float x1, float y1, |
| float x2, float y2); |
| public native void curveTo(float x1, float y1, |
| float x2, float y2, |
| float x3, float y3); |
| public native void closePath(); |
| public native void pathDone(); |
| public native long getNativeConsumer(); |
| } |