Source Code Cross Referenced for QtImageDecoderFactory.java in  » 6.0-JDK-Modules » j2me » sun » awt » qt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » sun.awt.qt 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)QtImageDecoderFactory.java	1.5 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation. 
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt). 
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA 
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package sun.awt.qt;
029:
030:        import java.io.*;
031:        import sun.awt.image.*;
032:
033:        /**
034:         * <code>QtImageDecoderFactory</code> produces <code>QtImageDecoder</code>
035:         * for the GIF, JPEG and PNG image formats on QWS platform.
036:         * <code>QtToolkit</code> is responsible for instantiating this class 
037:         * and set as the default decoder factory.
038:         * <p>
039:         * Setting <b>-Dsun.awt.qt.img.decoder.factory.enable=false</b> on the 
040:         * application command line will disable the installation of this 
041:         * factory and will use java image decoders.
042:         *
043:         * @see sun.awt.image.ImageDecoderFactory
044:         */
045:        class QtImageDecoderFactory extends ImageDecoderFactory {
046:            java.util.HashMap nativeDecoderList;
047:
048:            QtImageDecoderFactory() {
049:                this .nativeDecoderList = new java.util.HashMap();
050:            }
051:
052:            /**
053:             * Create an instance of <codeQtImageDecoderFactory</code> with a 
054:             * list of QT image formats that should be enabled
055:             */
056:            QtImageDecoderFactory(String[] qtImgFormats) {
057:                this ();
058:                enableNativeDecoder(qtImgFormats);
059:            }
060:
061:            /**
062:             * Creates an instance of a new <code>ImageDecoder</code> for the 
063:             * image format specified.
064:             */
065:            public ImageDecoder newImageDecoder(InputStreamImageSource source,
066:                    InputStream input, String imgFormat) throws IOException {
067:                ImageDecoder decoder = null;
068:                if (this .nativeDecoderList.get(imgFormat) == QtImageDecoder.class) {
069:                    decoder = new QtImageDecoder(source, input, imgFormat);
070:                } else {
071:                    /* for all other formats, let us delegate to the 
072:                     * super class */
073:                    decoder = super .newImageDecoder(source, input, imgFormat);
074:                }
075:
076:                return decoder;
077:            }
078:
079:            /**
080:             * Enable the Qt's native decoder for the image format specified
081:             *
082:             * @param imgFormat image format as specified by the constants defined
083:             *        in <code>sun.awt.image.ImageDecoderFactory</code>
084:             */
085:            synchronized void enableNativeDecoder(String imgFormat) {
086:                this .nativeDecoderList.put(imgFormat, QtImageDecoder.class);
087:            }
088:
089:            /**
090:             * Disable the Qt's native decoder for the image format specified
091:             *
092:             * @param imgFormat image format as specified by the constants defined
093:             *        in <code>sun.awt.image.ImageDecoderFactory</code>
094:             */
095:            synchronized void disableNativeDecoder(String imgFormat) {
096:                this .nativeDecoderList.put(imgFormat, null);
097:            }
098:
099:            /**
100:             * Enable the native decoders for the image formats supported by 
101:             * Qt.
102:             *
103:             * @param qtImgFormats QT image formats. On Qt 2.3.2 the following are
104:             *        the constants of interest
105:             *        <ul>
106:             *        <li><b>GIF</b></li>
107:             *        <li><b>JPEG</b></li>
108:             *        <li><b>PNG</b></li>
109:             *        <li><b>XBM</b></li>
110:             *        </ul>
111:             */
112:            private void enableNativeDecoder(String[] qtImgFormats) {
113:                /* For all the image formats supported by Personal profile, 
114:                 * enable the native decoder if the Qt platform supports it
115:                 */
116:                for (int i = 0; i < qtImgFormats.length; i++) {
117:                    if (qtImgFormats[i].equals("GIF")) {
118:                        enableNativeDecoder(ImageDecoderFactory.IMG_FORMAT_GIF);
119:                    } else if (qtImgFormats[i].equals("JPEG")) {
120:                        enableNativeDecoder(ImageDecoderFactory.IMG_FORMAT_JPG);
121:                    } else if (qtImgFormats[i].equals("PNG")) {
122:                        enableNativeDecoder(ImageDecoderFactory.IMG_FORMAT_PNG);
123:                    }
124:
125:                    /*
126:                     * Note :- Eventhough Qt supports XBM, it does not render very
127:                     * well.  We get a black rectangle. This could be because of 
128:                     * the background color of the window. The same behavior is seen
129:                     * if we perform the same operations using a native QT app. So
130:                     * we are using the Java decoder for XBM which works fine.
131:                     */
132:                }
133:            }
134:
135:        }
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