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comparison dwt/internal/image/TIFFFileFormat.d @ 0:380af2bdd8e5

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author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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children 5123b17c98ef
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-1:000000000000 0:380af2bdd8e5
1 /*******************************************************************************
2 * Copyright (c) 2000, 2005 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 *******************************************************************************/
11 module dwt.internal.image;
12
13
14 import java.io.IOException;
15
16 import dwt.DWT;
17 import dwt.graphics.ImageData;
18 import dwt.graphics.ImageLoader;
19
20 /**
21 * Baseline TIFF decoder revision 6.0
22 * Extension T4-encoding CCITT T.4 1D
23 */
24 public final class TIFFFileFormat : FileFormat {
25
26 bool isFileFormat(LEDataInputStream stream) {
27 try {
28 byte[] header = new byte[4];
29 stream.read(header);
30 stream.unread(header);
31 if (header[0] !is header[1]) return false;
32 if (!(header[0] is 0x49 && header[2] is 42 && header[3] is 0) &&
33 !(header[0] is 0x4d && header[2] is 0 && header[3] is 42)) {
34 return false;
35 }
36 return true;
37 } catch (Exception e) {
38 return false;
39 }
40 }
41
42 ImageData[] loadFromByteStream() {
43 byte[] header = new byte[8];
44 bool isLittleEndian;
45 ImageData[] images = new ImageData[0];
46 TIFFRandomFileAccess file = new TIFFRandomFileAccess(inputStream);
47 try {
48 file.read(header);
49 if (header[0] !is header[1]) DWT.error(DWT.ERROR_INVALID_IMAGE);
50 if (!(header[0] is 0x49 && header[2] is 42 && header[3] is 0) &&
51 !(header[0] is 0x4d && header[2] is 0 && header[3] is 42)) {
52 DWT.error(DWT.ERROR_INVALID_IMAGE);
53 }
54 isLittleEndian = header[0] is 0x49;
55 int offset = isLittleEndian ?
56 (header[4] & 0xFF) | ((header[5] & 0xFF) << 8) | ((header[6] & 0xFF) << 16) | ((header[7] & 0xFF) << 24) :
57 (header[7] & 0xFF) | ((header[6] & 0xFF) << 8) | ((header[5] & 0xFF) << 16) | ((header[4] & 0xFF) << 24);
58 file.seek(offset);
59 TIFFDirectory directory = new TIFFDirectory(file, isLittleEndian, loader);
60 ImageData image = directory.read();
61 /* A baseline reader is only expected to read the first directory */
62 images = new ImageData[] {image};
63 } catch (IOException e) {
64 DWT.error(DWT.ERROR_IO, e);
65 }
66 return images;
67 }
68
69 void unloadIntoByteStream(ImageLoader loader) {
70 /* We do not currently support writing multi-page tiff,
71 * so we use the first image data in the loader's array. */
72 ImageData image = loader.data[0];
73 TIFFDirectory directory = new TIFFDirectory(image);
74 try {
75 directory.writeToStream(outputStream);
76 } catch (IOException e) {
77 DWT.error(DWT.ERROR_IO, e);
78 }
79 }
80
81 }