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

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