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1
7
8 package com.sun.imageio.plugins.jpeg;
9
10 import javax.imageio.spi.ImageWriterSpi  ;
11 import javax.imageio.spi.ServiceRegistry ;
12 import javax.imageio.spi.IIORegistry ;
13 import javax.imageio.ImageWriter ;
14 import javax.imageio.ImageTypeSpecifier ;
15 import javax.imageio.IIOException ;
16
17 import java.awt.image.ColorModel ;
18 import java.awt.image.IndexColorModel ;
19 import java.awt.image.SampleModel ;
20 import java.util.Locale ;
21
22 public class JPEGImageWriterSpi extends ImageWriterSpi {
23
24 private static String [] readerSpiNames =
25 {"com.sun.imageio.plugins.jpeg.JPEGImageReaderSpi"};
26
27 private boolean registered = false;
28
29 public JPEGImageWriterSpi() {
30 super(JPEG.vendor,
31 JPEG.version,
32 JPEG.names,
33 JPEG.suffixes,
34 JPEG.MIMETypes,
35 "com.sun.imageio.plugins.jpeg.JPEGImageWriter",
36 STANDARD_OUTPUT_TYPE,
37 readerSpiNames,
38 true,
39 JPEG.nativeStreamMetadataFormatName,
40 JPEG.nativeStreamMetadataFormatClassName,
41 null, null,
42 true,
43 JPEG.nativeImageMetadataFormatName,
44 JPEG.nativeImageMetadataFormatClassName,
45 null, null
46 );
47 }
48
49 public String getDescription(Locale locale) {
50 return "Standard JPEG Image Writer";
51 }
52
53 public void onRegistration(ServiceRegistry registry,
54 Class <?> category) {
55 if (registered) {
56 return;
57 }
58 try {
59 java.security.AccessController.doPrivileged(
60 new sun.security.action.LoadLibraryAction("jpeg"));
61 } catch (Throwable e) { registry.deregisterServiceProvider(this);
64 return;
65 }
66
67 registered = true;
68 }
69
70 public boolean isFormatLossless() {
71 return false;
72 }
73
74 public boolean canEncodeImage(ImageTypeSpecifier type) {
75 SampleModel sampleModel = type.getSampleModel();
76
77 int[] sampleSize = sampleModel.getSampleSize();
79 int bitDepth = sampleSize[0];
80 for (int i = 1; i < sampleSize.length; i++) {
81 if (sampleSize[i] > bitDepth) {
82 bitDepth = sampleSize[i];
83 }
84 }
85
86 if (bitDepth < 1 || bitDepth > 8) {
88 return false;
89 }
90
91 return true;
92 }
93
94 public ImageWriter createWriterInstance(Object extension)
95 throws IIOException {
96 return new JPEGImageWriter(this);
97 }
98 }
99 |
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