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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 org.eclipse.swt.graphics.ImageLoader;
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12
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13
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14 public import org.eclipse.swt.graphics.ImageLoaderListener;
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15 public import org.eclipse.swt.graphics.ImageLoaderEvent;
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16 public import org.eclipse.swt.graphics.ImageData;
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17
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18 import org.eclipse.swt.SWT;
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19 import org.eclipse.swt.internal.Compatibility;
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20 //import org.eclipse.swt.internal.image.*;
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21
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22 import tango.core.Exception;
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23 import tango.core.Array;
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24 import tango.io.model.IConduit;
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25
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26 class FileFormat{
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27 static ImageData[] load( InputStream, ImageLoader ){ return null; }
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28 static void save( OutputStream, int, ImageLoader ){}
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29 }
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30
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31 /**
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32 * Instances of this class are used to load images from,
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33 * and save images to, a file or stream.
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34 * <p>
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35 * Currently supported image formats are:
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36 * </p><ul>
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37 * <li>BMP (Windows or OS/2 Bitmap)</li>
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38 * <li>ICO (Windows Icon)</li>
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39 * <li>JPEG</li>
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40 * <li>GIF</li>
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41 * <li>PNG</li>
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42 * <li>TIFF</li>
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43 * </ul>
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44 * <code>ImageLoaders</code> can be used to:
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45 * <ul>
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46 * <li>load/save single images in all formats</li>
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47 * <li>load/save multiple images (GIF/ICO/TIFF)</li>
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48 * <li>load/save animated GIF images</li>
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49 * <li>load interlaced GIF/PNG images</li>
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50 * <li>load progressive JPEG images</li>
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51 * </ul>
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52 */
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53
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54 public class ImageLoader {
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55
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56 /**
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57 * the array of ImageData objects in this ImageLoader.
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58 * This array is read in when the load method is called,
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59 * and it is written out when the save method is called
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60 */
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61 public ImageData[] data;
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62
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63 /**
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64 * the width of the logical screen on which the images
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65 * reside, in pixels (this corresponds to the GIF89a
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66 * Logical Screen Width value)
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67 */
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68 public int logicalScreenWidth;
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69
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70 /**
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71 * the height of the logical screen on which the images
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72 * reside, in pixels (this corresponds to the GIF89a
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73 * Logical Screen Height value)
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74 */
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75 public int logicalScreenHeight;
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76
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77 /**
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78 * the background pixel for the logical screen (this
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79 * corresponds to the GIF89a Background Color Index value).
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80 * The default is -1 which means 'unspecified background'
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81 *
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82 */
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83 public int backgroundPixel;
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84
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85 /**
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86 * the number of times to repeat the display of a sequence
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87 * of animated images (this corresponds to the commonly-used
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88 * GIF application extension for "NETSCAPE 2.0 01").
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89 * The default is 1. A value of 0 means 'display repeatedly'
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90 */
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91 public int repeatCount;
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92
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93 /*
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94 * the set of ImageLoader event listeners, created on demand
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95 */
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96 ImageLoaderListener[] imageLoaderListeners;
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97
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98 /**
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99 * Construct a new empty ImageLoader.
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100 */
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101 public this() {
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102 reset();
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103 }
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104
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105 /**
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106 * Resets the fields of the ImageLoader, except for the
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107 * <code>imageLoaderListeners</code> field.
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108 */
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109 void reset() {
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110 data = null;
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111 logicalScreenWidth = 0;
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112 logicalScreenHeight = 0;
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113 backgroundPixel = -1;
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114 repeatCount = 1;
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115 }
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116
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117 /**
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118 * Loads an array of <code>ImageData</code> objects from the
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119 * specified input stream. Throws an error if either an error
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120 * occurs while loading the images, or if the images are not
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121 * of a supported type. Returns the loaded image data array.
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122 *
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123 * @param stream the input stream to load the images from
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124 * @return an array of <code>ImageData</code> objects loaded from the specified input stream
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125 *
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126 * @exception IllegalArgumentException <ul>
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127 * <li>ERROR_NULL_ARGUMENT - if the stream is null</li>
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128 * </ul>
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129 * @exception SWTException <ul>
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130 * <li>ERROR_IO - if an IO error occurs while reading from the stream</li>
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131 * <li>ERROR_INVALID_IMAGE - if the image stream contains invalid data</li>
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132 * <li>ERROR_UNSUPPORTED_FORMAT - if the image stream contains an unrecognized format</li>
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133 * </ul>
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134 */
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135 public ImageData[] load(InputStream stream) {
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136 if (stream is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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137 reset();
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138 data = FileFormat.load(stream, this);
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139 return data;
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140 }
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141
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142 /**
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143 * Loads an array of <code>ImageData</code> objects from the
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144 * file with the specified name. Throws an error if either
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145 * an error occurs while loading the images, or if the images are
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146 * not of a supported type. Returns the loaded image data array.
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147 *
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148 * @param filename the name of the file to load the images from
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149 * @return an array of <code>ImageData</code> objects loaded from the specified file
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150 *
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151 * @exception IllegalArgumentException <ul>
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152 * <li>ERROR_NULL_ARGUMENT - if the file name is null</li>
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153 * </ul>
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154 * @exception SWTException <ul>
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155 * <li>ERROR_IO - if an IO error occurs while reading from the file</li>
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156 * <li>ERROR_INVALID_IMAGE - if the image file contains invalid data</li>
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157 * <li>ERROR_UNSUPPORTED_FORMAT - if the image file contains an unrecognized format</li>
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158 * </ul>
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159 */
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160 public ImageData[] load(char[] filename) {
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161 if (filename is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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162 InputStream stream = null;
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163 void close(){
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164 try {
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165 if( stream !is null ) stream.close();
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166 } catch (IOException e) {
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167 // Ignore error
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168 }
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169 }
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170 try {
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171 stream = Compatibility.newFileInputStream(filename);
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172 scope(exit) close();
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173
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174 return load(stream);
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175 } catch (IOException e) {
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176 SWT.error(SWT.ERROR_IO, e);
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177 }
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178 return null;
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179 }
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180
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181 /**
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182 * Saves the image data in this ImageLoader to the specified stream.
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183 * The format parameter can have one of the following values:
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184 * <dl>
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185 * <dt><code>IMAGE_BMP</code></dt>
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186 * <dd>Windows BMP file format, no compression</dd>
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187 * <dt><code>IMAGE_BMP_RLE</code></dt>
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188 * <dd>Windows BMP file format, RLE compression if appropriate</dd>
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189 * <dt><code>IMAGE_GIF</code></dt>
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190 * <dd>GIF file format</dd>
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191 * <dt><code>IMAGE_ICO</code></dt>
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192 * <dd>Windows ICO file format</dd>
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193 * <dt><code>IMAGE_JPEG</code></dt>
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194 * <dd>JPEG file format</dd>
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195 * <dt><code>IMAGE_PNG</code></dt>
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196 * <dd>PNG file format</dd>
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197 * </dl>
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198 *
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199 * @param stream the output stream to write the images to
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200 * @param format the format to write the images in
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201 *
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202 * @exception IllegalArgumentException <ul>
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203 * <li>ERROR_NULL_ARGUMENT - if the stream is null</li>
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204 * </ul>
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205 * @exception SWTException <ul>
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206 * <li>ERROR_IO - if an IO error occurs while writing to the stream</li>
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207 * <li>ERROR_INVALID_IMAGE - if the image data contains invalid data</li>
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208 * <li>ERROR_UNSUPPORTED_FORMAT - if the image data cannot be saved to the requested format</li>
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209 * </ul>
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210 */
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211 public void save(OutputStream stream, int format) {
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212 if (stream is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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213 FileFormat.save(stream, format, this);
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214 }
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215
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216 /**
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217 * Saves the image data in this ImageLoader to a file with the specified name.
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218 * The format parameter can have one of the following values:
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219 * <dl>
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220 * <dt><code>IMAGE_BMP</code></dt>
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221 * <dd>Windows BMP file format, no compression</dd>
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222 * <dt><code>IMAGE_BMP_RLE</code></dt>
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223 * <dd>Windows BMP file format, RLE compression if appropriate</dd>
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224 * <dt><code>IMAGE_GIF</code></dt>
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225 * <dd>GIF file format</dd>
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226 * <dt><code>IMAGE_ICO</code></dt>
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227 * <dd>Windows ICO file format</dd>
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228 * <dt><code>IMAGE_JPEG</code></dt>
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229 * <dd>JPEG file format</dd>
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230 * <dt><code>IMAGE_PNG</code></dt>
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231 * <dd>PNG file format</dd>
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232 * </dl>
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233 *
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234 * @param filename the name of the file to write the images to
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235 * @param format the format to write the images in
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236 *
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237 * @exception IllegalArgumentException <ul>
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238 * <li>ERROR_NULL_ARGUMENT - if the file name is null</li>
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239 * </ul>
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240 * @exception SWTException <ul>
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241 * <li>ERROR_IO - if an IO error occurs while writing to the file</li>
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242 * <li>ERROR_INVALID_IMAGE - if the image data contains invalid data</li>
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243 * <li>ERROR_UNSUPPORTED_FORMAT - if the image data cannot be saved to the requested format</li>
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244 * </ul>
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245 */
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246 public void save(char[] filename, int format) {
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247 if (filename is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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248 OutputStream stream = null;
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249 try {
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250 stream = Compatibility.newFileOutputStream(filename);
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251 } catch (IOException e) {
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252 SWT.error(SWT.ERROR_IO, e);
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253 }
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254 save(stream, format);
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255 try {
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256 stream.close();
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257 } catch (IOException e) {
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258 }
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259 }
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260
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261 /**
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262 * Adds the listener to the collection of listeners who will be
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263 * notified when image data is either partially or completely loaded.
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264 * <p>
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265 * An ImageLoaderListener should be added before invoking
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266 * one of the receiver's load methods. The listener's
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267 * <code>imageDataLoaded</code> method is called when image
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268 * data has been partially loaded, as is supported by interlaced
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269 * GIF/PNG or progressive JPEG images.
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270 *
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271 * @param listener the listener which should be notified
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272 *
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273 * @exception IllegalArgumentException <ul>
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274 * <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
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275 * </ul>
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276 *
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277 * @see ImageLoaderListener
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278 * @see ImageLoaderEvent
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279 */
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280 public void addImageLoaderListener(ImageLoaderListener listener) {
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281 if (listener is null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
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282 imageLoaderListeners ~= listener;
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283 }
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284
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285 /**
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286 * Removes the listener from the collection of listeners who will be
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287 * notified when image data is either partially or completely loaded.
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288 *
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289 * @param listener the listener which should no longer be notified
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290 *
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291 * @exception IllegalArgumentException <ul>
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292 * <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
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293 * </ul>
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294 *
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295 * @see #addImageLoaderListener(ImageLoaderListener)
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296 */
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297 public void removeImageLoaderListener(ImageLoaderListener listener) {
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298 if (listener is null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
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299 if (imageLoaderListeners.length == 0 ) return;
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300 tango.core.Array.remove( imageLoaderListeners, listener, delegate bool(ImageLoaderListener l1, ImageLoaderListener l2 ){ return l1 is l2; });
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301 }
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302
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303 /**
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304 * Returns <code>true</code> if the receiver has image loader
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305 * listeners, and <code>false</code> otherwise.
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306 *
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307 * @return <code>true</code> if there are <code>ImageLoaderListener</code>s, and <code>false</code> otherwise
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308 *
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309 * @see #addImageLoaderListener(ImageLoaderListener)
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310 * @see #removeImageLoaderListener(ImageLoaderListener)
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311 */
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312 public bool hasListeners() {
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313 return imageLoaderListeners.length > 0;
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314 }
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315
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316 /**
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317 * Notifies all image loader listeners that an image loader event
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318 * has occurred. Pass the specified event object to each listener.
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319 *
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320 * @param event the <code>ImageLoaderEvent</code> to send to each <code>ImageLoaderListener</code>
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321 */
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322 public void notifyListeners(ImageLoaderEvent event) {
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323 if (!hasListeners()) return;
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324 foreach( listener; imageLoaderListeners ){
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325 listener.imageDataLoaded(event);
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326 }
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327 }
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328
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329 }
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