Showing the changes to java/pkg2/sun/awt/image/JPEGImageDecoder.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,160 @@ | ||
| 1 | +/* | |
| 2 | + * @(#)JPEGImageDecoder.java 1.7 97/02/23 Jim Graham | |
| 3 | + * | |
| 4 | + * Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved. | |
| 5 | + * | |
| 6 | + * Permission to use, copy, modify, and distribute this software | |
| 7 | + * and its documentation for NON-COMMERCIAL purposes and without | |
| 8 | + * fee is hereby granted provided that this copyright notice | |
| 9 | + * appears in all copies. Please refer to the file "copyright.html" | |
| 10 | + * for further important copyright and licensing information. | |
| 11 | + * | |
| 12 | + * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF | |
| 13 | + * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED | |
| 14 | + * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A | |
| 15 | + * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR | |
| 16 | + * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR | |
| 17 | + * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. | |
| 18 | + */ | |
| 19 | + | |
| 20 | +/*- | |
| 21 | + * Reads JPEG images from an InputStream and reports the | |
| 22 | + * image data to an InputStreamImageSource object. | |
| 23 | + * | |
| 24 | + * The native implementation of the JPEG image decoder was adapted from | |
| 25 | + * release 6 of the free JPEG software from the Independent JPEG Group. | |
| 26 | + */ | |
| 27 | +package sun.awt.image; | |
| 28 | + | |
| 29 | +import java.util.Vector; | |
| 30 | +import java.util.Hashtable; | |
| 31 | +import java.io.InputStream; | |
| 32 | +import java.io.IOException; | |
| 33 | +import java.awt.image.*; | |
| 34 | + | |
| 35 | +/** | |
| 36 | + * JPEG Image converter | |
| 37 | + * | |
| 38 | + * @version 1.7 02/23/97 | |
| 39 | + * @author Jim Graham | |
| 40 | + */ | |
| 41 | +public class JPEGImageDecoder extends ImageDecoder { | |
| 42 | + private static ColorModel RGBcolormodel; | |
| 43 | + private static ColorModel Graycolormodel; | |
| 44 | + | |
| 45 | + static { | |
| 46 | + System.loadLibrary("jpeg"); | |
| 47 | + RGBcolormodel = new DirectColorModel(24, 0xff0000, 0xff00, 0xff); | |
| 48 | + byte g[] = new byte[256]; | |
| 49 | + for (int i = 0; i < 256; i++) { | |
| 50 | + g[i] = (byte) i; | |
| 51 | + } | |
| 52 | + Graycolormodel = new IndexColorModel(8, 256, g, g, g); | |
| 53 | + } | |
| 54 | + | |
| 55 | + private native void readImage(InputStream is, byte buf[]) | |
| 56 | + throws ImageFormatException, IOException; | |
| 57 | + | |
| 58 | + PixelStore store; | |
| 59 | + Hashtable props = new Hashtable(); | |
| 60 | + | |
| 61 | + public JPEGImageDecoder(InputStreamImageSource src, InputStream is) { | |
| 62 | + super(src, is); | |
| 63 | + } | |
| 64 | + | |
| 65 | + public synchronized boolean catchupConsumer(InputStreamImageSource src, | |
| 66 | + ImageConsumer ic) | |
| 67 | + { | |
| 68 | + return ((store == null) || store.replay(src, ic)); | |
| 69 | + } | |
| 70 | + | |
| 71 | + public synchronized void makeStore(int width, int height, boolean gray) { | |
| 72 | + if (gray) { | |
| 73 | + store = new PixelStore8(width, height); | |
| 74 | + } else { | |
| 75 | + store = new PixelStore32(width, height); | |
| 76 | + } | |
| 77 | + } | |
| 78 | + | |
| 79 | + /** | |
| 80 | + * An error has occurred. Throw an exception. | |
| 81 | + */ | |
| 82 | + private static void error(String s1) throws ImageFormatException { | |
| 83 | + throw new ImageFormatException(s1); | |
| 84 | + } | |
| 85 | + | |
| 86 | + public boolean sendHeaderInfo(int width, int height, | |
| 87 | + boolean gray, boolean multipass) { | |
| 88 | + setDimensions(width, height); | |
| 89 | + makeStore(width, height, gray); | |
| 90 | + | |
| 91 | + setProperties(props); | |
| 92 | + store.setProperties(props); | |
| 93 | + | |
| 94 | + ColorModel colormodel = gray ? Graycolormodel : RGBcolormodel; | |
| 95 | + setColorModel(colormodel); | |
| 96 | + store.setColorModel(colormodel); | |
| 97 | + | |
| 98 | + int flags = hintflags; | |
| 99 | + if (!multipass) { | |
| 100 | + flags |= ImageConsumer.SINGLEPASS; | |
| 101 | + } | |
| 102 | + setHints(hintflags); | |
| 103 | + store.setHints(hintflags); | |
| 104 | + | |
| 105 | + headerComplete(); | |
| 106 | + | |
| 107 | + return true; | |
| 108 | + } | |
| 109 | + | |
| 110 | + public boolean sendPixels(int pixels[], int y) { | |
| 111 | + int count = setPixels(0, y, pixels.length, 1, RGBcolormodel, | |
| 112 | + pixels, 0, pixels.length); | |
| 113 | + if (count > 0) { | |
| 114 | + store.setPixels(0, y, pixels.length, 1, pixels, 0, pixels.length); | |
| 115 | + } else { | |
| 116 | + aborted = true; | |
| 117 | + } | |
| 118 | + return !aborted; | |
| 119 | + } | |
| 120 | + | |
| 121 | + public boolean sendPixels(byte pixels[], int y) { | |
| 122 | + int count = setPixels(0, y, pixels.length, 1, Graycolormodel, | |
| 123 | + pixels, 0, pixels.length); | |
| 124 | + if (count > 0) { | |
| 125 | + store.setPixels(0, y, pixels.length, 1, pixels, 0, pixels.length); | |
| 126 | + } else { | |
| 127 | + aborted = true; | |
| 128 | + } | |
| 129 | + return !aborted; | |
| 130 | + } | |
| 131 | + | |
| 132 | + /** | |
| 133 | + * produce an image from the stream. | |
| 134 | + */ | |
| 135 | + public void produceImage() throws IOException, ImageFormatException { | |
| 136 | + try { | |
| 137 | + readImage(input, new byte[1024]); | |
| 138 | + if (!aborted) { | |
| 139 | + store.imageComplete(); | |
| 140 | + if (store.getBitState() != PixelStore.BITS_LOST) { | |
| 141 | + source.setPixelStore(this, store); | |
| 142 | + } | |
| 143 | + imageComplete(ImageConsumer.STATICIMAGEDONE, true); | |
| 144 | + } | |
| 145 | + } catch (IOException e) { | |
| 146 | + if (!aborted) { | |
| 147 | + throw e; | |
| 148 | + } | |
| 149 | + } finally { | |
| 150 | + close(); | |
| 151 | + } | |
| 152 | + } | |
| 153 | + | |
| 154 | + /** | |
| 155 | + * The ImageConsumer hints flag for a JPEG image. | |
| 156 | + */ | |
| 157 | + private static final int hintflags = | |
| 158 | + ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES | | |
| 159 | + ImageConsumer.SINGLEFRAME; | |
| 160 | +} | |