1/*
2 * Copyright (c) 2005, 2010, 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
26package com.sun.imageio.plugins.gif;
27
28import java.awt.image.ColorModel;
29import java.awt.image.SampleModel;
30import java.util.Locale;
31import javax.imageio.ImageTypeSpecifier;
32import javax.imageio.ImageWriter;
33import javax.imageio.spi.ImageWriterSpi;
34import javax.imageio.stream.ImageOutputStream;
35import com.sun.imageio.plugins.common.PaletteBuilder;
36
37public class GIFImageWriterSpi extends ImageWriterSpi {
38
39    private static final String vendorName = "Oracle Corporation";
40
41    private static final String version = "1.0";
42
43    private static final String[] names = { "gif", "GIF" };
44
45    private static final String[] suffixes = { "gif" };
46
47    private static final String[] MIMETypes = { "image/gif" };
48
49    private static final String writerClassName =
50    "com.sun.imageio.plugins.gif.GIFImageWriter";
51
52    private static final String[] readerSpiNames = {
53        "com.sun.imageio.plugins.gif.GIFImageReaderSpi"
54    };
55
56    public GIFImageWriterSpi() {
57        super(vendorName,
58              version,
59              names,
60              suffixes,
61              MIMETypes,
62              writerClassName,
63              new Class<?>[] { ImageOutputStream.class },
64              readerSpiNames,
65              true,
66              GIFWritableStreamMetadata.NATIVE_FORMAT_NAME,
67              "com.sun.imageio.plugins.gif.GIFStreamMetadataFormat",
68              null, null,
69              true,
70              GIFWritableImageMetadata.NATIVE_FORMAT_NAME,
71              "com.sun.imageio.plugins.gif.GIFImageMetadataFormat",
72              null, null
73              );
74    }
75
76    public boolean canEncodeImage(ImageTypeSpecifier type) {
77        if (type == null) {
78            throw new IllegalArgumentException("type == null!");
79        }
80
81        SampleModel sm = type.getSampleModel();
82        ColorModel cm = type.getColorModel();
83
84        boolean canEncode = sm.getNumBands() == 1 &&
85            sm.getSampleSize(0) <= 8 &&
86            sm.getWidth() <= 65535 &&
87            sm.getHeight() <= 65535 &&
88            (cm == null || cm.getComponentSize()[0] <= 8);
89
90        if (canEncode) {
91            return true;
92        } else {
93            return PaletteBuilder.canCreatePalette(type);
94        }
95    }
96
97    public String getDescription(Locale locale) {
98        return "Standard GIF image writer";
99    }
100
101    public ImageWriter createWriterInstance(Object extension) {
102        return new GIFImageWriter(this);
103    }
104}
105