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| 1 | /* | ||
| 2 | * Copyright (c) 1995, 2003, 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 | * Reads JPEG images from an InputStream and reports the | ||
| 27 | * image data to an InputStreamImageSource object. | ||
| 28 | * | ||
| 29 | * The native implementation of the JPEG image decoder was adapted from | ||
| 30 | * release 6 of the free JPEG software from the Independent JPEG Group. | ||
| 31 | */ | ||
| 32 | package sun.awt.image; | ||
| 33 | |||
| 34 | import java.util.Vector; | ||
| 35 | import java.util.Hashtable; | ||
| 36 | import java.io.InputStream; | ||
| 37 | import java.io.IOException; | ||
| 38 | import java.awt.image.*; | ||
| 39 | |||
| 40 | /** | ||
| 41 | * JPEG Image converter | ||
| 42 | * | ||
| 43 | * @author Jim Graham | ||
| 44 | */ | ||
| 45 | public class JPEGImageDecoder extends ImageDecoder { | ||
| 46 | private static ColorModel RGBcolormodel; | ||
| 47 | private static ColorModel ARGBcolormodel; | ||
| 48 | private static ColorModel Graycolormodel; | ||
| 49 | |||
| 50 | private static final Class InputStreamClass = InputStream.class; | ||
| 51 | private static native void initIDs(Class InputStreamClass); | ||
| 52 | |||
| 53 | private ColorModel colormodel; | ||
| 54 | |||
| 55 | static { | ||
| 56 | java.security.AccessController.doPrivileged( | ||
| 57 | new sun.security.action.LoadLibraryAction("jpeg")); | ||
| 58 | initIDs(InputStreamClass); | ||
| 59 | RGBcolormodel = new DirectColorModel(24, 0xff0000, 0xff00, 0xff); | ||
| 60 | ARGBcolormodel = ColorModel.getRGBdefault(); | ||
| 61 | byte g[] = new byte[256]; | ||
| 62 | for (int i = 0; i < 256; i++) { | ||
| 63 | g[i] = (byte) i; | ||
| 64 | } | ||
| 65 | Graycolormodel = new IndexColorModel(8, 256, g, g, g); | ||
| 66 | } | ||
| 67 | |||
| 68 | private native void readImage(InputStream is, byte buf[]) | ||
| 69 | throws ImageFormatException, IOException; | ||
| 70 | |||
| 71 | Hashtable props = new Hashtable(); | ||
| 72 | |||
| 73 | public JPEGImageDecoder(InputStreamImageSource src, InputStream is) { | ||
| 74 | super(src, is); | ||
| 75 | } | ||
| 76 | |||
| 77 | /** | ||
| 78 | * An error has occurred. Throw an exception. | ||
| 79 | */ | ||
| 80 | private static void error(String s1) throws ImageFormatException { | ||
| 81 | throw new ImageFormatException(s1); | ||
| 82 | } | ||
| 83 | |||
| 84 | public boolean sendHeaderInfo(int width, int height, | ||
| 85 | boolean gray, boolean hasalpha, | ||
| 86 | boolean multipass) | ||
| 87 | { | ||
| 88 | setDimensions(width, height); | ||
| 89 | |||
| 90 | setProperties(props); | ||
| 91 | if (gray) { | ||
| 92 | colormodel = Graycolormodel; | ||
| 93 | } else { | ||
| 94 | if (hasalpha) { | ||
| 95 | colormodel = ARGBcolormodel; | ||
| 96 | } else { | ||
| 97 | colormodel = RGBcolormodel; | ||
| 98 | } | ||
| 99 | } | ||
| 100 | |||
| 101 | setColorModel(colormodel); | ||
| 102 | |||
| 103 | int flags = hintflags; | ||
| 104 | if (!multipass) { | ||
| 105 | flags |= ImageConsumer.SINGLEPASS; | ||
| 106 | } | ||
| 107 | setHints(hintflags); | ||
| 108 | headerComplete(); | ||
| 109 | |||
| 110 | return true; | ||
| 111 | } | ||
| 112 | |||
| 113 | public boolean sendPixels(int pixels[], int y) { | ||
| 114 | int count = setPixels(0, y, pixels.length, 1, colormodel, | ||
| 115 | pixels, 0, pixels.length); | ||
| 116 | if (count <= 0) { | ||
| 117 | aborted = true; | ||
| 118 | } | ||
| 119 | return !aborted; | ||
| 120 | } | ||
| 121 | |||
| 122 | public boolean sendPixels(byte pixels[], int y) { | ||
| 123 | int count = setPixels(0, y, pixels.length, 1, colormodel, | ||
| 124 | pixels, 0, pixels.length); | ||
| 125 | if (count <= 0) { | ||
| 126 | aborted = true; | ||
| 127 | } | ||
| 128 | return !aborted; | ||
| 129 | } | ||
| 130 | |||
| 131 | /** | ||
| 132 | * produce an image from the stream. | ||
| 133 | */ | ||
| 134 | public void produceImage() throws IOException, ImageFormatException { | ||
| 135 | try { | ||
| 136 | readImage(input, new byte[1024]); | ||
| 137 | if (!aborted) { | ||
| 138 | imageComplete(ImageConsumer.STATICIMAGEDONE, true); | ||
| 139 | } | ||
| 140 | } catch (IOException e) { | ||
| 141 | if (!aborted) { | ||
| 142 | throw e; | ||
| 143 | } | ||
| 144 | } finally { | ||
| 145 | close(); | ||
| 146 | } | ||
| 147 | } | ||
| 148 | |||
| 149 | /** | ||
| 150 | * The ImageConsumer hints flag for a JPEG image. | ||
| 151 | */ | ||
| 152 | private static final int hintflags = | ||
| 153 | ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES | | ||
| 154 | ImageConsumer.SINGLEFRAME; | ||
| 155 | } | ||