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annotate dwt/internal/image/FileFormat.d @ 34:5123b17c98ef

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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sun, 14 Sep 2008 01:45:57 +0200
parents a9ab4c738ed8
children d8635bb48c7c
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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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15 import dwt.dwthelper.utils;
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17 public import dwt.graphics.ImageLoader;
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18 public import dwt.graphics.ImageData;
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19 public import dwt.internal.image.LEDataInputStream;
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20 public import dwt.internal.image.LEDataOutputStream;
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22 import dwt.DWT;
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24 public import dwt.dwthelper.InputStream;
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25 public import dwt.dwthelper.OutputStream;
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27 import dwt.internal.image.GIFFileFormat;
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28 import dwt.internal.image.WinBMPFileFormat;
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29 import dwt.internal.image.WinICOFileFormat;
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30 import dwt.internal.image.TIFFFileFormat;
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31 import dwt.internal.image.OS2BMPFileFormat;
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32 import dwt.internal.image.JPEGFileFormat;
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33 import dwt.internal.image.PNGFileFormat;
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35 import tango.core.Exception;
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36 import tango.core.Tuple;
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38 /**
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39 * Abstract factory class for loading/unloading images from files or streams
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40 * in various image file formats.
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41 *
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42 */
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43 public abstract class FileFormat {
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44 static const String FORMAT_PACKAGE = "dwt.internal.image"; //$NON-NLS-1$
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45 static const String FORMAT_SUFFIX = "FileFormat"; //$NON-NLS-1$
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46 static const 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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47 alias Tuple!( WinBMPFileFormat, WinBMPFileFormat, GIFFileFormat, WinICOFileFormat, JPEGFileFormat, PNGFileFormat, TIFFFileFormat, OS2BMPFileFormat ) TFormats;
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48 LEDataInputStream inputStream;
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49 LEDataOutputStream outputStream;
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50 ImageLoader loader;
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51 int compression;
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52
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53 /**
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54 * Return whether or not the specified input stream
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55 * represents a supported file format.
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56 */
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57 abstract bool isFileFormat(LEDataInputStream stream);
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58
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59 abstract ImageData[] loadFromByteStream();
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60
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61 /**
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62 * Read the specified input stream, and return the
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63 * device independent image array represented by the stream.
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64 */
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65 public ImageData[] loadFromStream(LEDataInputStream stream) {
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66 try {
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67 inputStream = stream;
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68 return loadFromByteStream();
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69 } catch (IOException e) {
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70 DWT.error(DWT.ERROR_IO, e);
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71 return null;
0
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72 } catch (Exception e) {
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73 DWT.error(DWT.ERROR_INVALID_IMAGE, e);
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74 return null;
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75 }
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76 }
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77
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78 /**
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79 * Read the specified input stream using the specified loader, and
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80 * return the device independent image array represented by the stream.
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81 */
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82 public static ImageData[] load(InputStream istr, ImageLoader loader) {
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83 FileFormat fileFormat = null;
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84 LEDataInputStream stream = new LEDataInputStream(istr);
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85 bool isSupported = false;
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86 foreach( TFormat; TFormats ){
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87 try{
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88 fileFormat = new TFormat();
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89 if (fileFormat.isFileFormat(stream)) {
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90 isSupported = true;
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91 break;
0
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92 }
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93 } catch (Exception e) {
0
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94 }
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95 }
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96 if (!isSupported) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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97 fileFormat.loader = loader;
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98 return fileFormat.loadFromStream(stream);
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99 }
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100
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101 /**
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102 * Write the device independent image array stored in the specified loader
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103 * to the specified output stream using the specified file format.
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104 */
0
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105 public static void save(OutputStream os, int format, ImageLoader loader) {
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106 if (format < 0 || format >= FORMATS.length) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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107 if (FORMATS[format] is null) DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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108 if (loader.data is null || loader.data.length < 1) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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109
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110 LEDataOutputStream stream = new LEDataOutputStream(os);
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111 FileFormat fileFormat = null;
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112 try {
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113 foreach( idx, TFormat; TFormats ){
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114 if( idx is format ){
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115 fileFormat = new TFormat();
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116 }
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117 }
0
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118 } catch (Exception e) {
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119 DWT.error(DWT.ERROR_UNSUPPORTED_FORMAT);
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120 }
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121 if (format is DWT.IMAGE_BMP_RLE) {
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122 switch (loader.data[0].depth) {
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123 case 8: fileFormat.compression = 1; break;
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124 case 4: fileFormat.compression = 2; break;
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125 default:
0
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126 }
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127 }
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128 fileFormat.unloadIntoStream(loader, stream);
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129 }
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130
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131 abstract void unloadIntoByteStream(ImageLoader loader);
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132
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133 /**
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134 * Write the device independent image array stored in the specified loader
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135 * to the specified output stream.
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136 */
0
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137 public void unloadIntoStream(ImageLoader loader, LEDataOutputStream stream) {
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138 try {
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139 outputStream = stream;
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140 unloadIntoByteStream(loader);
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141 outputStream.flush();
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142 } catch (Exception e) {
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143 try {outputStream.flush();} catch (Exception f) {}
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144 DWT.error(DWT.ERROR_IO, e);
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145 }
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146 }
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147 }