| /* |
| * Copyright (c) 1995, 2003, 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. |
| */ |
| /*- |
| * Reads JPEG images from an InputStream and reports the |
| * image data to an InputStreamImageSource object. |
| * |
| * The native implementation of the JPEG image decoder was adapted from |
| * release 6 of the free JPEG software from the Independent JPEG Group. |
| */ |
| package sun.awt.image; |
| |
| import java.util.Vector; |
| import java.util.Hashtable; |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.awt.image.*; |
| |
| /** |
| * JPEG Image converter |
| * |
| * @author Jim Graham |
| */ |
| public class JPEGImageDecoder extends ImageDecoder { |
| private static ColorModel RGBcolormodel; |
| private static ColorModel ARGBcolormodel; |
| private static ColorModel Graycolormodel; |
| |
| private static final Class InputStreamClass = InputStream.class; |
| private static native void initIDs(Class InputStreamClass); |
| |
| private ColorModel colormodel; |
| |
| static { |
| java.security.AccessController.doPrivileged( |
| new sun.security.action.LoadLibraryAction("jpeg")); |
| initIDs(InputStreamClass); |
| RGBcolormodel = new DirectColorModel(24, 0xff0000, 0xff00, 0xff); |
| ARGBcolormodel = ColorModel.getRGBdefault(); |
| byte g[] = new byte[256]; |
| for (int i = 0; i < 256; i++) { |
| g[i] = (byte) i; |
| } |
| Graycolormodel = new IndexColorModel(8, 256, g, g, g); |
| } |
| |
| private native void readImage(InputStream is, byte buf[]) |
| throws ImageFormatException, IOException; |
| |
| Hashtable props = new Hashtable(); |
| |
| public JPEGImageDecoder(InputStreamImageSource src, InputStream is) { |
| super(src, is); |
| } |
| |
| /** |
| * An error has occurred. Throw an exception. |
| */ |
| private static void error(String s1) throws ImageFormatException { |
| throw new ImageFormatException(s1); |
| } |
| |
| public boolean sendHeaderInfo(int width, int height, |
| boolean gray, boolean hasalpha, |
| boolean multipass) |
| { |
| setDimensions(width, height); |
| |
| setProperties(props); |
| if (gray) { |
| colormodel = Graycolormodel; |
| } else { |
| if (hasalpha) { |
| colormodel = ARGBcolormodel; |
| } else { |
| colormodel = RGBcolormodel; |
| } |
| } |
| |
| setColorModel(colormodel); |
| |
| int flags = hintflags; |
| if (!multipass) { |
| flags |= ImageConsumer.SINGLEPASS; |
| } |
| setHints(hintflags); |
| headerComplete(); |
| |
| return true; |
| } |
| |
| public boolean sendPixels(int pixels[], int y) { |
| int count = setPixels(0, y, pixels.length, 1, colormodel, |
| pixels, 0, pixels.length); |
| if (count <= 0) { |
| aborted = true; |
| } |
| return !aborted; |
| } |
| |
| public boolean sendPixels(byte pixels[], int y) { |
| int count = setPixels(0, y, pixels.length, 1, colormodel, |
| pixels, 0, pixels.length); |
| if (count <= 0) { |
| aborted = true; |
| } |
| return !aborted; |
| } |
| |
| /** |
| * produce an image from the stream. |
| */ |
| public void produceImage() throws IOException, ImageFormatException { |
| try { |
| readImage(input, new byte[1024]); |
| if (!aborted) { |
| imageComplete(ImageConsumer.STATICIMAGEDONE, true); |
| } |
| } catch (IOException e) { |
| if (!aborted) { |
| throw e; |
| } |
| } finally { |
| close(); |
| } |
| } |
| |
| /** |
| * The ImageConsumer hints flag for a JPEG image. |
| */ |
| private static final int hintflags = |
| ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES | |
| ImageConsumer.SINGLEFRAME; |
| } |