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1
7
8 package com.sun.imageio.plugins.gif;
9
10 import java.awt.image.ColorModel  ;
11 import java.awt.image.SampleModel ;
12 import java.util.Locale ;
13 import javax.imageio.ImageTypeSpecifier ;
14 import javax.imageio.ImageWriter ;
15 import javax.imageio.spi.ImageWriterSpi ;
16 import com.sun.imageio.plugins.common.PaletteBuilder;
17
18 public class GIFImageWriterSpi extends ImageWriterSpi {
19
20 private static final String vendorName = "Sun Microsystems, Inc.";
21
22 private static final String version = "1.0";
23
24 private static final String [] names = { "gif", "GIF" };
25
26 private static final String [] suffixes = { "gif" };
27
28 private static final String [] MIMETypes = { "image/gif" };
29
30 private static final String writerClassName =
31 "com.sun.imageio.plugins.gif.GIFImageWriter";
32
33 private static final String [] readerSpiNames = {
34 "com.sun.imageio.plugins.gif.GIFImageReaderSpi"
35 };
36
37 public GIFImageWriterSpi() {
38 super(vendorName,
39 version,
40 names,
41 suffixes,
42 MIMETypes,
43 writerClassName,
44 STANDARD_OUTPUT_TYPE,
45 readerSpiNames,
46 true,
47 GIFWritableStreamMetadata.NATIVE_FORMAT_NAME,
48 "com.sun.imageio.plugins.gif.GIFStreamMetadataFormat",
49 null, null,
50 true,
51 GIFWritableImageMetadata.NATIVE_FORMAT_NAME,
52 "com.sun.imageio.plugins.gif.GIFImageMetadataFormat",
53 null, null
54 );
55 }
56
57 public boolean canEncodeImage(ImageTypeSpecifier type) {
58 if (type == null) {
59 throw new IllegalArgumentException ("type == null!");
60 }
61
62 SampleModel sm = type.getSampleModel();
63 ColorModel cm = type.getColorModel();
64
65 boolean canEncode = sm.getNumBands() == 1 &&
66 sm.getSampleSize(0) <= 8 &&
67 sm.getWidth() <= 65535 &&
68 sm.getHeight() <= 65535 &&
69 (cm == null || cm.getComponentSize()[0] <= 8);
70
71 if (canEncode) {
72 return true;
73 } else {
74 return PaletteBuilder.canCreatePalette(type);
75 }
76 }
77
78 public String getDescription(Locale locale) {
79 return "Standard GIF image writer";
80 }
81
82 public ImageWriter createWriterInstance(Object extension) {
83 return new GIFImageWriter(this);
84 }
85 }
86 |
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