1 /*
2 * $RCSfile: GIFImageWriterSpi.java,v $
3 *
4 *
5 * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * - Redistribution of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * - Redistribution in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * Neither the name of Sun Microsystems, Inc. or the names of
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * This software is provided "AS IS," without a warranty of any
24 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
25 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
27 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
28 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
29 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
30 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
31 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
32 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
33 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
34 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGES.
36 *
37 * You acknowledge that this software is not designed or intended for
38 * use in the design, construction, operation or maintenance of any
39 * nuclear facility.
40 *
41 * $Revision: 1.3 $
42 * $Date: 2006/03/31 19:43:39 $
43 * $State: Exp $
44 */
45
46 package com.github.jaiimageio.impl.plugins.gif;
47
48 import java.awt.image.ColorModel;
49 import java.awt.image.SampleModel;
50 import java.util.Locale;
51
52 import javax.imageio.ImageTypeSpecifier;
53 import javax.imageio.ImageWriter;
54 import javax.imageio.spi.ImageWriterSpi;
55 import javax.imageio.spi.ServiceRegistry;
56
57 import com.github.jaiimageio.impl.common.ImageUtil;
58 import com.github.jaiimageio.impl.common.PackageUtil;
59 import com.github.jaiimageio.impl.common.PaletteBuilder;
60
61 public class GIFImageWriterSpi extends ImageWriterSpi {
62
63 private static final String vendorName = "Sun Microsystems, Inc.";
64
65 private static final String version = "1.0";
66
67 private static final String[] names = { "gif", "GIF" };
68
69 private static final String[] suffixes = { "gif" };
70
71 private static final String[] MIMETypes = { "image/gif" };
72
73 private static final String writerClassName =
74 "com.github.jaiimageio.impl.plugins.gif.GIFImageWriter";
75
76 private static final String[] readerSpiNames = {
77 "com.sun.imageio.plugins.gif.GIFImageReaderSpi"
78 };
79
80 private boolean registered = false;
81
82 public GIFImageWriterSpi() {
83 super(vendorName,
84 version,
85 names,
86 suffixes,
87 MIMETypes,
88 writerClassName,
89 STANDARD_OUTPUT_TYPE,
90 readerSpiNames,
91 true,
92 GIFWritableStreamMetadata.NATIVE_FORMAT_NAME,
93 "com.github.jaiimageio.impl.plugins.gif.GIFStreamMetadataFormat",
94 null, null,
95 true,
96 GIFWritableImageMetadata.NATIVE_FORMAT_NAME,
97 "com.github.jaiimageio.impl.plugins.gif.GIFStreamMetadataFormat",
98 null, null
99 );
100 }
101
102 public boolean canEncodeImage(ImageTypeSpecifier type) {
103 if (type == null) {
104 throw new IllegalArgumentException("type == null!");
105 }
106
107 SampleModel sm = type.getSampleModel();
108 ColorModel cm = type.getColorModel();
109
110 boolean canEncode = sm.getNumBands() == 1 &&
111 sm.getSampleSize(0) <= 8 &&
112 sm.getWidth() <= 65535 &&
113 sm.getHeight() <= 65535 &&
114 (cm == null || cm.getComponentSize()[0] <= 8);
115
116 if (canEncode) {
117 return true;
118 } else {
119 return PaletteBuilder.canCreatePalette(type);
120 }
121 }
122
123 public String getDescription(Locale locale) {
124 String desc = PackageUtil.getSpecificationTitle() +
125 " GIF Image Writer";
126 return desc;
127 }
128
129 public void onRegistration(ServiceRegistry registry,
130 Class category) {
131 if (registered) {
132 return;
133 }
134
135 registered = true;
136
137 // By JDK 1.8, the GIFImageWriter will have been in JDK core for
138 // atleast two FCS releases, so we can set JIIO's to lower priority
139 // With JDK 1.9, we can entirely de-register the JIIO one
140 ImageUtil.processOnRegistration(registry, category, "GIF", this,
141 9, 8); // JDK version 1.9, 1.8
142 }
143
144 public ImageWriter createWriterInstance(Object extension) {
145 return new GIFImageWriter(this);
146 }
147 }
148