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annotate dwt/internal/image/FileFormat.d @ 57:41dbc4d9faab

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Update to tango trunk -r3152. Thanks DavidLeon for the adjustment of TracedException to Exception and creating the patch.
author Frank Benoit <benoit@tionex.de>
date Mon, 04 Feb 2008 12:46:24 +0100
parents 57151e2793a2
children ab60f3309436
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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 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.internal.image.FileFormat;
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14
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15 public import dwt.graphics.ImageLoader;
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16 public import dwt.graphics.ImageData;
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17 public import dwt.internal.image.LEDataInputStream;
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18 public import dwt.internal.image.LEDataOutputStream;
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19
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20 import dwt.DWT;
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21
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22 public import dwt.dwthelper.InputStream;
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23 public import dwt.dwthelper.OutputStream;
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24
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25 import dwt.internal.image.GIFFileFormat;
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26 import dwt.internal.image.WinBMPFileFormat;
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27 import dwt.internal.image.WinICOFileFormat;
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28 import dwt.internal.image.TIFFFileFormat;
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29 import dwt.internal.image.OS2BMPFileFormat;
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30 import dwt.internal.image.JPEGFileFormat;
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31 import dwt.internal.image.PNGFileFormat;
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32
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33 import tango.core.Exception;
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34 import tango.core.Tuple;
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35
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36 /**
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37 * Abstract factory class for loading/unloading images from files or streams
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38 * in various image file formats.
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39 *
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40 */
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41 public abstract class FileFormat {
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42 static const char[] FORMAT_PACKAGE = "dwt.internal.image"; //$NON-NLS-1$
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43 static const char[] FORMAT_SUFFIX = "FileFormat"; //$NON-NLS-1$
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44 static const char[][] 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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45 alias Tuple!( WinBMPFileFormat, WinBMPFileFormat, GIFFileFormat, WinICOFileFormat, JPEGFileFormat, PNGFileFormat, TIFFFileFormat, OS2BMPFileFormat ) TFormats;
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46 LEDataInputStream inputStream;
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47 LEDataOutputStream outputStream;
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48 ImageLoader loader;
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49 int compression;
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50
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51 /**
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52 * Return whether or not the specified input stream
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53 * represents a supported file format.
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54 */
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55 abstract bool isFileFormat(LEDataInputStream stream);
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56
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57 abstract ImageData[] loadFromByteStream();
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58
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59 /**
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60 * Read the specified input stream, and return the
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61 * device independent image array represented by the stream.
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62 */
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63 public ImageData[] loadFromStream(LEDataInputStream stream) {
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64 try {
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65 inputStream = stream;
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66 return loadFromByteStream();
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67 } catch (IOException e) {
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68 DWT.error(DWT.ERROR_IO, e);
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69 return null;
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70 } catch (Exception e) {
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71 DWT.error(DWT.ERROR_INVALID_IMAGE, e);
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72 return null;
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73 }
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74 }
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75
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76 /**
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77 * Read the specified input stream using the specified loader, and
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78 * return the device independent image array represented by the stream.
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79 */
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80 public static ImageData[] load(InputStream istr, ImageLoader loader) {
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81 FileFormat fileFormat = null;
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82 LEDataInputStream stream = new LEDataInputStream(istr);
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83 bool isSupported = false;
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84 foreach( TFormat; TFormats ){
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85 try{
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86 fileFormat = new TFormat();
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87 if (fileFormat.isFileFormat(stream)) {
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88 isSupported = true;
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89 break;
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90 }
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41dbc4d9faab Update to tango trunk -r3152. Thanks DavidLeon for the adjustment of TracedException to Exception and creating the patch.
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91 } catch (Exception e) {
2
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92 }
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93 }
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94 if (!isSupported) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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95 fileFormat.loader = loader;
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96 return fileFormat.loadFromStream(stream);
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97 }
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98
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99 /**
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100 * Write the device independent image array stored in the specified loader
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101 * to the specified output stream using the specified file format.
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102 */
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103 public static void save(OutputStream os, int format, ImageLoader loader) {
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104 if (format < 0 || format >= FORMATS.length) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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105 if (FORMATS[format] is null) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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106 if (loader.data is null || loader.data.length < 1) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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107
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108 LEDataOutputStream stream = new LEDataOutputStream(os);
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109 FileFormat fileFormat = null;
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110 try {
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111 foreach( idx, TFormat; TFormats ){
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112 if( idx is format ){
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113 fileFormat = new TFormat();
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114 }
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115 }
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116 } catch (Exception e) {
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117 DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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118 }
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119 if (format is DWT.IMAGE_BMP_RLE) {
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120 switch (loader.data[0].depth) {
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121 case 8: fileFormat.compression = 1; break;
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122 case 4: fileFormat.compression = 2; break;
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123 default:
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124 }
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125 }
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126 fileFormat.unloadIntoStream(loader, stream);
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127 }
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128
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129 abstract void unloadIntoByteStream(ImageLoader loader);
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130
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131 /**
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132 * Write the device independent image array stored in the specified loader
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133 * to the specified output stream.
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134 */
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135 public void unloadIntoStream(ImageLoader loader, LEDataOutputStream stream) {
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136 try {
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137 outputStream = stream;
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138 unloadIntoByteStream(loader);
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139 outputStream.flush();
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140 } catch (Exception e) {
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141 try {outputStream.flush();} catch (Exception f) {}
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142 DWT.error(DWT.ERROR_IO, e);
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143 }
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144 }
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145 }