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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.java2d.pipe; | |
| 27 | + | |
| 28 | +import java.awt.geom.PathIterator; | |
| 29 | +import java.awt.Rectangle; | |
| 30 | +import sun.awt.geom.PathConsumer2D; | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * This class can iterate individual span elements generated by scan | |
| 34 | + * converting a Shape. | |
| 35 | + * This particular implementation flattens the incoming path and then | |
| 36 | + * performs simple polygon tracing to calculate the spans. | |
| 37 | + * | |
| 38 | + * Note that this class holds pointers to native data which must be | |
| 39 | + * disposed. It is not marked as finalizable since it is intended | |
| 40 | + * to be very lightweight and finalization is a comparitively expensive | |
| 41 | + * procedure. The caller must specifically use try{} finally{} to | |
| 42 | + * manually ensure that the object is disposed after use, otherwise | |
| 43 | + * native data structures might be leaked. | |
| 44 | + * | |
| 45 | + * Here is a code sample for using this class: | |
| 46 | + * | |
| 47 | + * public void fillShape(Shape s, Rectangle clipRect) { | |
| 48 | + * ShapeSpanIterator ssi = new ShapeSpanIterator(false); | |
| 49 | + * try { | |
| 50 | + * ssi.setOutputArea(clipRect); | |
| 51 | + * ssi.appendPath(s.getPathIterator(null)); | |
| 52 | + * int spanbox[] = new int[4]; | |
| 53 | + * while (ssi.nextSpan(spanbox)) { | |
| 54 | + * int x = spanbox[0]; | |
| 55 | + * int y = spanbox[1]; | |
| 56 | + * int w = spanbox[2] - x; | |
| 57 | + * int h = spanbox[3] - y; | |
| 58 | + * fillRect(x, y, w, h); | |
| 59 | + * } | |
| 60 | + * } finally { | |
| 61 | + * ssi.dispose(); | |
| 62 | + * } | |
| 63 | + * } | |
| 64 | + */ | |
| 65 | +public final class ShapeSpanIterator | |
| 66 | + implements SpanIterator, PathConsumer2D | |
| 67 | +{ | |
| 68 | + long pData; | |
| 69 | + | |
| 70 | + static { | |
| 71 | + initIDs(); | |
| 72 | + } | |
| 73 | + | |
| 74 | + public static native void initIDs(); | |
| 75 | + | |
| 76 | + public ShapeSpanIterator(boolean adjust) { | |
| 77 | + setNormalize(adjust); | |
| 78 | + } | |
| 79 | + | |
| 80 | + /* | |
| 81 | + * Appends the geometry and winding rule from the indicated | |
| 82 | + * path iterator. | |
| 83 | + */ | |
| 84 | + public void appendPath(PathIterator pi) { | |
| 85 | + float coords[] = new float[6]; | |
| 86 | + | |
| 87 | + setRule(pi.getWindingRule()); | |
| 88 | + while (!pi.isDone()) { | |
| 89 | + addSegment(pi.currentSegment(coords), coords); | |
| 90 | + pi.next(); | |
| 91 | + } | |
| 92 | + pathDone(); | |
| 93 | + } | |
| 94 | + | |
| 95 | + /* | |
| 96 | + * Appends the geometry from the indicated set of polygon points. | |
| 97 | + */ | |
| 98 | + public native void appendPoly(int xPoints[], int yPoints[], int nPoints, | |
| 99 | + int xoff, int yoff); | |
| 100 | + | |
| 101 | + /* | |
| 102 | + * Sets the normalization flag so that incoming data is | |
| 103 | + * adjusted to nearest (0.25, 0.25) subpixel position. | |
| 104 | + */ | |
| 105 | + private native void setNormalize(boolean adjust); | |
| 106 | + | |
| 107 | + /* | |
| 108 | + * Sets the rectangle of interest for storing and returning | |
| 109 | + * span segments. | |
| 110 | + */ | |
| 111 | + public void setOutputAreaXYWH(int x, int y, int w, int h) { | |
| 112 | + setOutputAreaXYXY(x, y, Region.dimAdd(x, w), Region.dimAdd(y, h)); | |
| 113 | + } | |
| 114 | + | |
| 115 | + /* | |
| 116 | + * Sets the rectangle of interest for storing and returning | |
| 117 | + * span segments. | |
| 118 | + */ | |
| 119 | + public native void setOutputAreaXYXY(int lox, int loy, int hix, int hiy); | |
| 120 | + | |
| 121 | + /* | |
| 122 | + * Sets the rectangle of interest for storing and returning | |
| 123 | + * span segments to the specified Rectangle. | |
| 124 | + */ | |
| 125 | + public void setOutputArea(Rectangle r) { | |
| 126 | + setOutputAreaXYWH(r.x, r.y, r.width, r.height); | |
| 127 | + } | |
| 128 | + | |
| 129 | + /* | |
| 130 | + * Sets the rectangle of interest for storing and returning | |
| 131 | + * span segments to the bounds of the specified Region. | |
| 132 | + */ | |
| 133 | + public void setOutputArea(Region r) { | |
| 134 | + setOutputAreaXYXY(r.lox, r.loy, r.hix, r.hiy); | |
| 135 | + } | |
| 136 | + | |
| 137 | + /* | |
| 138 | + * Sets the winding rule in the native data structures. | |
| 139 | + */ | |
| 140 | + public native void setRule(int rule); | |
| 141 | + | |
| 142 | + /* | |
| 143 | + * Adds a single PathIterator segment to the internal list of | |
| 144 | + * path element structures. | |
| 145 | + */ | |
| 146 | + public native void addSegment(int type, float coords[]); | |
| 147 | + | |
| 148 | + /* | |
| 149 | + * Gets the bbox of the available path segments, clipped to the | |
| 150 | + * OutputArea. | |
| 151 | + */ | |
| 152 | + public native void getPathBox(int pathbox[]); | |
| 153 | + | |
| 154 | + /* | |
| 155 | + * Intersects the path box with the given bbox. | |
| 156 | + * Returned spans are clipped to this region, or discarded | |
| 157 | + * altogether if they lie outside it. | |
| 158 | + */ | |
| 159 | + public native void intersectClipBox(int lox, int loy, int hix, int hiy); | |
| 160 | + | |
| 161 | + /* | |
| 162 | + * Fetches the next span that needs to be operated on. | |
| 163 | + * If the return value is false then there are no more spans. | |
| 164 | + */ | |
| 165 | + public native boolean nextSpan(int spanbox[]); | |
| 166 | + | |
| 167 | + /** | |
| 168 | + * This method tells the iterator that it may skip all spans | |
| 169 | + * whose Y range is completely above the indicated Y coordinate. | |
| 170 | + */ | |
| 171 | + public native void skipDownTo(int y); | |
| 172 | + | |
| 173 | + /** | |
| 174 | + * This method returns a native pointer to a function block that | |
| 175 | + * can be used by a native method to perform the same iteration | |
| 176 | + * cycle that the above methods provide while avoiding upcalls to | |
| 177 | + * the Java object. | |
| 178 | + * The definition of the structure whose pointer is returned by | |
| 179 | + * this method is defined in: | |
| 180 | + * <pre> | |
| 181 | + * src/share/native/sun/java2d/pipe/SpanIterator.h | |
| 182 | + * </pre> | |
| 183 | + */ | |
| 184 | + public native long getNativeIterator(); | |
| 185 | + | |
| 186 | + /* | |
| 187 | + * Cleans out all internal data structures. | |
| 188 | + */ | |
| 189 | + public native void dispose(); | |
| 190 | + | |
| 191 | + public native void moveTo(float x, float y); | |
| 192 | + public native void lineTo(float x, float y); | |
| 193 | + public native void quadTo(float x1, float y1, | |
| 194 | + float x2, float y2); | |
| 195 | + public native void curveTo(float x1, float y1, | |
| 196 | + float x2, float y2, | |
| 197 | + float x3, float y3); | |
| 198 | + public native void closePath(); | |
| 199 | + public native void pathDone(); | |
| 200 | + public native long getNativeConsumer(); | |
| 201 | +} | |