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annotate dwt/internal/image/FileFormat.d @ 8:a9ab4c738ed8

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Fix: instanceof
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:32:39 +0200
parents e831403a80a9
children 5123b17c98ef
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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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 import java.io.InputStream;
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16 import java.io.OutputStream;
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17
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18 import dwt.DWT;
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19 import dwt.graphics.ImageData;
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20 import dwt.graphics.ImageLoader;
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21
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22 /**
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23 * Abstract factory class for loading/unloading images from files or streams
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24 * in various image file formats.
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25 *
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26 */
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27 public abstract class FileFormat {
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28 static final String FORMAT_PACKAGE = "dwt.internal.image"; //$NON-NLS-1$
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29 static final String FORMAT_SUFFIX = "FileFormat"; //$NON-NLS-1$
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30 static final String[] FORMATS = {"WinBMP", "WinBMP", "GIF", "WinICO", "JPEG", "PNG", "TIFF", "OS2BMP"}; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$//$NON-NLS-5$ //$NON-NLS-6$//$NON-NLS-7$//$NON-NLS-8$
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31
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32 LEDataInputStream inputStream;
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33 LEDataOutputStream outputStream;
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34 ImageLoader loader;
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35 int compression;
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36
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37 /**
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38 * Return whether or not the specified input stream
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39 * represents a supported file format.
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40 */
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41 abstract bool isFileFormat(LEDataInputStream stream);
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42
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43 abstract ImageData[] loadFromByteStream();
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44
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45 /**
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46 * Read the specified input stream, and return the
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47 * device independent image array represented by the stream.
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48 */
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49 public ImageData[] loadFromStream(LEDataInputStream stream) {
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50 try {
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51 inputStream = stream;
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52 return loadFromByteStream();
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53 } catch (Exception e) {
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54 if ( null !is cast(IOException)e ) {
0
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55 DWT.error(DWT.ERROR_IO, e);
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56 } else {
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57 DWT.error(DWT.ERROR_INVALID_IMAGE, e);
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58 }
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59 return null;
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60 }
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61 }
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62
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63 /**
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64 * Read the specified input stream using the specified loader, and
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65 * return the device independent image array represented by the stream.
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66 */
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67 public static ImageData[] load(InputStream is, ImageLoader loader) {
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68 FileFormat fileFormat = null;
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69 LEDataInputStream stream = new LEDataInputStream(is);
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70 bool isSupported = false;
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71 for (int i = 1; i < FORMATS.length; i++) {
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72 if (FORMATS[i] !is null) {
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73 try {
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74 Class clazz = Class.forName(FORMAT_PACKAGE + '.' + FORMATS[i] + FORMAT_SUFFIX);
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75 fileFormat = cast(FileFormat) clazz.newInstance();
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76 if (fileFormat.isFileFormat(stream)) {
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77 isSupported = true;
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78 break;
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79 }
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80 } catch (ClassNotFoundException e) {
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81 FORMATS[i] = null;
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82 } catch (Exception e) {
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83 }
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84 }
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85 }
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86 if (!isSupported) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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87 fileFormat.loader = loader;
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88 return fileFormat.loadFromStream(stream);
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89 }
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90
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91 /**
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92 * Write the device independent image array stored in the specified loader
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93 * to the specified output stream using the specified file format.
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94 */
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95 public static void save(OutputStream os, int format, ImageLoader loader) {
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96 if (format < 0 || format >= FORMATS.length) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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97 if (FORMATS[format] is null) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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98 if (loader.data is null || loader.data.length < 1) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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99
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100 LEDataOutputStream stream = new LEDataOutputStream(os);
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101 FileFormat fileFormat = null;
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102 try {
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103 Class clazz = Class.forName(FORMAT_PACKAGE + '.' + FORMATS[format] + FORMAT_SUFFIX);
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104 fileFormat = cast(FileFormat) clazz.newInstance();
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105 } catch (Exception e) {
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106 DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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107 }
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108 if (format is DWT.IMAGE_BMP_RLE) {
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109 switch (loader.data[0].depth) {
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110 case 8: fileFormat.compression = 1; break;
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111 case 4: fileFormat.compression = 2; break;
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112 }
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113 }
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114 fileFormat.unloadIntoStream(loader, stream);
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115 }
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116
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117 abstract void unloadIntoByteStream(ImageLoader loader);
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118
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119 /**
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120 * Write the device independent image array stored in the specified loader
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121 * to the specified output stream.
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122 */
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123 public void unloadIntoStream(ImageLoader loader, LEDataOutputStream stream) {
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124 try {
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125 outputStream = stream;
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126 unloadIntoByteStream(loader);
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127 outputStream.flush();
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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128 } catch (Exception e) {
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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129 try {outputStream.flush();} catch (Exception f) {}
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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130 DWT.error(DWT.ERROR_IO, e);
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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131 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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132 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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133 }