Mercurial > projects > dwt2
annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/internal/image/GIFFileFormat.d @ 112:9f4c18c268b2
Update to compile and execute with dmd 2.052.
author | kntroh |
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date | Wed, 16 Mar 2011 21:53:53 +0900 |
parents | 0ecb2b338560 |
children | 536e43f63c81 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2008 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 org.eclipse.swt.internal.image.GIFFileFormat; |
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14 |
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15 public import org.eclipse.swt.internal.image.FileFormat; |
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16 public import org.eclipse.swt.graphics.PaletteData; |
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17 import org.eclipse.swt.internal.image.LEDataInputStream; |
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18 import org.eclipse.swt.internal.image.LZWCodec; |
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19 import org.eclipse.swt.graphics.RGB; |
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20 import org.eclipse.swt.SWT; |
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21 import org.eclipse.swt.graphics.ImageData; |
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22 import org.eclipse.swt.graphics.ImageLoaderEvent; |
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23 import org.eclipse.swt.graphics.ImageLoader; |
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24 import java.lang.all; |
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25 |
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26 |
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27 final class GIFFileFormat : FileFormat { |
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28 String signature; |
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29 int screenWidth, screenHeight, backgroundPixel, bitsPerPixel, defaultDepth; |
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30 int disposalMethod = 0; |
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31 int delayTime = 0; |
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32 int transparentPixel = -1; |
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33 int repeatCount = 1; |
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34 |
36
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35 static const int GIF_APPLICATION_EXTENSION_BLOCK_ID = 0xFF; |
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36 static const int GIF_GRAPHICS_CONTROL_BLOCK_ID = 0xF9; |
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37 static const int GIF_PLAIN_TEXT_BLOCK_ID = 0x01; |
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38 static const int GIF_COMMENT_BLOCK_ID = 0xFE; |
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39 static const int GIF_EXTENSION_BLOCK_ID = 0x21; |
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40 static const int GIF_IMAGE_BLOCK_ID = 0x2C; |
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41 static const int GIF_TRAILER_ID = 0x3B; |
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42 static const byte[] GIF89a = cast(byte[])"GIF89a"; |
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43 static const byte[] NETSCAPE2_0 = cast(byte[])"NETSCAPE2.0"; |
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44 |
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45 /** |
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46 * Answer a palette containing numGrays |
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47 * shades of gray, ranging from black to white. |
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48 */ |
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49 static PaletteData grayRamp(int numGrays) { |
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50 int n = numGrays - 1; |
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51 RGB[] colors = new RGB[numGrays]; |
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52 for (int i = 0; i < numGrays; i++) { |
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53 int intensity = cast(byte)((i * 3) * 256 / n); |
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54 colors[i] = new RGB(intensity, intensity, intensity); |
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55 } |
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56 return new PaletteData(colors); |
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57 } |
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58 |
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59 override bool isFileFormat(LEDataInputStream stream) { |
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60 try { |
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61 byte[3] signature; |
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62 stream.read(signature); |
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63 stream.unread(signature); |
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64 return signature[0] is 'G' && signature[1] is 'I' && signature[2] is 'F'; |
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65 } catch (Exception e) { |
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66 return false; |
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67 } |
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68 } |
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69 |
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70 /** |
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71 * Load the GIF image(s) stored in the input stream. |
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72 * Return an array of ImageData representing the image(s). |
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73 */ |
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74 override ImageData[] loadFromByteStream() { |
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75 byte[3] signature; |
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76 byte[3] versionBytes; |
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77 byte[7] block; |
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78 try { |
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79 inputStream.read(signature); |
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80 if (!(signature[0] is 'G' && signature[1] is 'I' && signature[2] is 'F')) |
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81 SWT.error(SWT.ERROR_INVALID_IMAGE); |
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82 |
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83 inputStream.read(versionBytes); |
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84 |
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85 inputStream.read(block); |
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86 } catch (IOException e) { |
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87 SWT.error(SWT.ERROR_IO, e); |
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88 } |
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89 screenWidth = (block[0] & 0xFF) | ((block[1] & 0xFF) << 8); |
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90 loader.logicalScreenWidth = screenWidth; |
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91 screenHeight = (block[2] & 0xFF) | ((block[3] & 0xFF) << 8); |
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92 loader.logicalScreenHeight = screenHeight; |
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93 byte bitField = block[4]; |
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94 backgroundPixel = block[5] & 0xFF; |
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95 //aspect = block[6] & 0xFF; |
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96 bitsPerPixel = ((bitField >> 4) & 0x07) + 1; |
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97 defaultDepth = (bitField & 0x7) + 1; |
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98 PaletteData palette = null; |
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99 if ((bitField & 0x80) !is 0) { |
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100 // Global palette. |
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101 //sorted = (bitField & 0x8) !is 0; |
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102 palette = readPalette(1 << defaultDepth); |
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103 } else { |
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104 // No global palette. |
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105 //sorted = false; |
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106 backgroundPixel = -1; |
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107 defaultDepth = bitsPerPixel; |
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108 } |
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109 loader.backgroundPixel = backgroundPixel; |
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110 |
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111 getExtensions(); |
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112 int id = readID(); |
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113 ImageData[] images = new ImageData[0]; |
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114 while (id is GIF_IMAGE_BLOCK_ID) { |
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115 ImageData image = readImageBlock(palette); |
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116 if (loader.hasListeners()) { |
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117 loader.notifyListeners(new ImageLoaderEvent(loader, image, 3, true)); |
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118 } |
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119 ImageData[] oldImages = images; |
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120 images = new ImageData[oldImages.length + 1]; |
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121 System.arraycopy(oldImages, 0, images, 0, oldImages.length); |
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122 images[images.length - 1] = image; |
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123 //images ~= image; |
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124 try { |
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125 /* Read the 0-byte terminator at the end of the image. */ |
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126 id = inputStream.read(); |
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127 if (id > 0) { |
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128 /* We read the terminator earlier. */ |
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129 byte[1] arr; |
112 | 130 arr[0] = cast(byte) id; |
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131 inputStream.unread( arr ); |
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132 } |
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133 } catch (IOException e) { |
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134 SWT.error(SWT.ERROR_IO, e); |
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135 } |
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136 getExtensions(); |
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137 id = readID(); |
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138 } |
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139 return images; |
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140 } |
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141 |
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142 /** |
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143 * Read and return the next block or extension identifier from the file. |
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144 */ |
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145 int readID() { |
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146 try { |
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147 return inputStream.read(); |
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148 } catch (IOException e) { |
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149 SWT.error(SWT.ERROR_IO, e); |
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150 } |
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151 return -1; |
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152 } |
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153 |
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154 /** |
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155 * Read extensions until an image descriptor appears. |
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156 * In the future, if we care about the extensions, they |
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157 * should be properly grouped with the image data before |
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158 * which they appeared. Right now, the interesting parts |
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159 * of some extensions are kept, but the rest is discarded. |
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160 * Throw an error if an error occurs. |
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161 */ |
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162 void getExtensions() { |
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163 int id = readID(); |
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164 while (id !is GIF_IMAGE_BLOCK_ID && id !is GIF_TRAILER_ID && id > 0) { |
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165 if (id is GIF_EXTENSION_BLOCK_ID) { |
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166 readExtension(); |
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167 } else { |
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168 SWT.error(SWT.ERROR_INVALID_IMAGE); |
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169 } |
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170 id = readID(); |
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171 } |
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172 if (id is GIF_IMAGE_BLOCK_ID || id is GIF_TRAILER_ID) { |
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173 try { |
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174 byte[1] arr; |
112 | 175 arr[0] = cast(byte) id; |
0
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176 inputStream.unread(arr); |
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177 } catch (IOException e) { |
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178 SWT.error(SWT.ERROR_IO, e); |
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179 } |
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180 } |
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181 } |
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182 |
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183 /** |
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184 * Read a control extension. |
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185 * Return the extension block data. |
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186 */ |
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187 byte[] readExtension() { |
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188 int extensionID = readID(); |
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189 if (extensionID is GIF_COMMENT_BLOCK_ID) |
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190 return readCommentExtension(); |
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191 if (extensionID is GIF_PLAIN_TEXT_BLOCK_ID) |
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192 return readPlainTextExtension(); |
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193 if (extensionID is GIF_GRAPHICS_CONTROL_BLOCK_ID) |
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194 return readGraphicsControlExtension(); |
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195 if (extensionID is GIF_APPLICATION_EXTENSION_BLOCK_ID) |
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196 return readApplicationExtension(); |
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197 // Otherwise, we don't recognize the block. If the |
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198 // field size is correct, we can just skip over |
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199 // the block contents. |
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200 try { |
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201 int extSize = inputStream.read(); |
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202 if (extSize < 0) { |
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203 SWT.error(SWT.ERROR_INVALID_IMAGE); |
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204 } |
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205 byte[] ext = new byte[extSize]; |
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206 inputStream.read(ext, 0, extSize); |
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207 return ext; |
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208 } catch (IOException e) { |
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209 SWT.error(SWT.ERROR_IO, e); |
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210 return null; |
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211 } |
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212 } |
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213 |
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214 /** |
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215 * We have just read the Comment extension identifier |
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216 * from the input stream. Read in the rest of the comment |
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217 * and return it. GIF comment blocks are variable size. |
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218 */ |
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219 byte[] readCommentExtension() { |
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220 try { |
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221 byte[] comment = new byte[0]; |
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222 byte[] block = new byte[255]; |
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223 int size = inputStream.read(); |
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224 while ((size > 0) && (inputStream.read(block, 0, size) !is -1)) { |
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225 byte[] oldComment = comment; |
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226 comment = new byte[oldComment.length + size]; |
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227 System.arraycopy(oldComment, 0, comment, 0, oldComment.length); |
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228 System.arraycopy(block, 0, comment, oldComment.length, size); |
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229 //comment ~= block[ 0 .. size ]; |
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230 size = inputStream.read(); |
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231 } |
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232 return comment; |
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233 } catch (Exception e) { |
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234 SWT.error(SWT.ERROR_IO, e); |
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235 return null; |
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236 } |
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237 } |
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238 |
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239 /** |
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240 * We have just read the PlainText extension identifier |
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241 * from the input stream. Read in the plain text info and text, |
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242 * and return the text. GIF plain text blocks are variable size. |
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243 */ |
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244 byte[] readPlainTextExtension() { |
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245 try { |
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246 // Read size of block = 0x0C. |
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247 inputStream.read(); |
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248 // Read the text information (x, y, width, height, colors). |
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249 byte[] info = new byte[12]; |
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250 inputStream.read(info); |
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251 // Read the text. |
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252 byte[] text = new byte[0]; |
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253 byte[] block = new byte[255]; |
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254 int size = inputStream.read(); |
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255 while ((size > 0) && (inputStream.read(block, 0, size) !is -1)) { |
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256 byte[] oldText = text; |
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257 text = new byte[oldText.length + size]; |
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258 System.arraycopy(oldText, 0, text, 0, oldText.length); |
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259 System.arraycopy(block, 0, text, oldText.length, size); |
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260 //text ~= block[ 0 .. size ]; |
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261 size = inputStream.read(); |
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262 } |
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263 return text; |
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264 } catch (Exception e) { |
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265 SWT.error(SWT.ERROR_IO, e); |
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266 return null; |
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267 } |
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268 } |
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269 |
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270 /** |
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271 * We have just read the GraphicsControl extension identifier |
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272 * from the input stream. Read in the control information, store |
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273 * it, and return it. |
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274 */ |
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275 byte[] readGraphicsControlExtension() { |
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276 try { |
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277 // Read size of block = 0x04. |
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278 inputStream.read(); |
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279 // Read the control block. |
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280 byte[] controlBlock = new byte[4]; |
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281 inputStream.read(controlBlock); |
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282 byte bitField = controlBlock[0]; |
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283 // Store the user input field. |
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284 //userInput = (bitField & 0x02) !is 0; |
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285 // Store the disposal method. |
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286 disposalMethod = (bitField >> 2) & 0x07; |
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287 // Store the delay time. |
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288 delayTime = (controlBlock[1] & 0xFF) | ((controlBlock[2] & 0xFF) << 8); |
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289 // Store the transparent color. |
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290 if ((bitField & 0x01) !is 0) { |
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291 transparentPixel = controlBlock[3] & 0xFF; |
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292 } else { |
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293 transparentPixel = -1; |
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294 } |
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295 // Read block terminator. |
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296 inputStream.read(); |
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297 return controlBlock; |
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298 } catch (Exception e) { |
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299 SWT.error(SWT.ERROR_IO, e); |
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300 return null; |
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301 } |
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302 } |
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303 |
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304 /** |
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305 * We have just read the Application extension identifier |
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306 * from the input stream. Read in the rest of the extension, |
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307 * look for and store 'number of repeats', and return the data. |
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308 */ |
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309 byte[] readApplicationExtension() { |
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310 try { |
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311 // Read size of block = 0x0B. |
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312 inputStream.read(); |
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313 // Read application identifier. |
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314 byte[] application = new byte[8]; |
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315 inputStream.read(application); |
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316 // Read authentication code. |
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317 byte[] authentication = new byte[3]; |
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318 inputStream.read(authentication); |
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319 // Read application data. |
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320 byte[] data = new byte[0]; |
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321 byte[] block = new byte[255]; |
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322 int size = inputStream.read(); |
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323 while ((size > 0) && (inputStream.read(block, 0, size) !is -1)) { |
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324 byte[] oldData = data; |
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325 data = new byte[oldData.length + size]; |
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326 System.arraycopy(oldData, 0, data, 0, oldData.length); |
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327 System.arraycopy(block, 0, data, oldData.length, size); |
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328 //data ~= block[ 0 .. size ]; |
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329 size = inputStream.read(); |
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330 } |
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331 // Look for the NETSCAPE 'repeat count' field for an animated GIF. |
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332 bool netscape = |
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333 application[0] is 'N' && |
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334 application[1] is 'E' && |
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335 application[2] is 'T' && |
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336 application[3] is 'S' && |
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337 application[4] is 'C' && |
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338 application[5] is 'A' && |
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339 application[6] is 'P' && |
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340 application[7] is 'E'; |
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341 bool authentic = |
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342 authentication[0] is '2' && |
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343 authentication[1] is '.' && |
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344 authentication[2] is '0'; |
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345 if (netscape && authentic && data[0] is 01) { //$NON-NLS-1$ //$NON-NLS-2$ |
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346 repeatCount = (data[1] & 0xFF) | ((data[2] & 0xFF) << 8); |
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347 loader.repeatCount = repeatCount; |
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348 } |
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349 return data; |
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350 } catch (Exception e) { |
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351 SWT.error(SWT.ERROR_IO, e); |
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352 return null; |
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|
353 } |
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|
354 } |
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355 |
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356 /** |
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357 * Return a DeviceIndependentImage representing the |
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parents:
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|
358 * image block at the current position in the input stream. |
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|
359 * Throw an error if an error occurs. |
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|
360 */ |
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361 ImageData readImageBlock(PaletteData defaultPalette) { |
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362 int depth; |
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|
363 PaletteData palette; |
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364 byte[] block = new byte[9]; |
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|
365 try { |
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|
366 inputStream.read(block); |
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367 } catch (IOException e) { |
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|
368 SWT.error(SWT.ERROR_IO, e); |
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parents:
diff
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|
369 } |
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parents:
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|
370 int left = (block[0] & 0xFF) | ((block[1] & 0xFF) << 8); |
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|
371 int top = (block[2] & 0xFF) | ((block[3] & 0xFF) << 8); |
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372 int width = (block[4] & 0xFF) | ((block[5] & 0xFF) << 8); |
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373 int height = (block[6] & 0xFF) | ((block[7] & 0xFF) << 8); |
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374 byte bitField = block[8]; |
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|
375 bool interlaced = (bitField & 0x40) !is 0; |
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376 //bool sorted = (bitField & 0x20) !is 0; |
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diff
changeset
|
377 if ((bitField & 0x80) !is 0) { |
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parents:
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|
378 // Local palette. |
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379 depth = (bitField & 0x7) + 1; |
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parents:
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|
380 palette = readPalette(1 << depth); |
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|
381 } else { |
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|
382 // No local palette. |
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383 depth = defaultDepth; |
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parents:
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|
384 palette = defaultPalette; |
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|
385 } |
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parents:
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|
386 /* Work around: Ignore the case where a GIF specifies an |
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diff
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|
387 * invalid index for the transparent pixel that is larger |
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parents:
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|
388 * than the number of entries in the palette. */ |
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parents:
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changeset
|
389 if (transparentPixel > 1 << depth) { |
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parents:
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changeset
|
390 transparentPixel = -1; |
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parents:
diff
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|
391 } |
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parents:
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|
392 // Promote depth to next highest supported value. |
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parents:
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|
393 if (!(depth is 1 || depth is 4 || depth is 8)) { |
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parents:
diff
changeset
|
394 if (depth < 4) |
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|
395 depth = 4; |
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diff
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|
396 else |
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|
397 depth = 8; |
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parents:
diff
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|
398 } |
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parents:
diff
changeset
|
399 if (palette is null) { |
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parents:
diff
changeset
|
400 palette = grayRamp(1 << depth); |
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parents:
diff
changeset
|
401 } |
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parents:
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changeset
|
402 int initialCodeSize = -1; |
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parents:
diff
changeset
|
403 try { |
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parents:
diff
changeset
|
404 initialCodeSize = inputStream.read(); |
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parents:
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|
405 } catch (IOException e) { |
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parents:
diff
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|
406 SWT.error(SWT.ERROR_IO, e); |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
407 } |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
408 if (initialCodeSize < 0) { |
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parents:
diff
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|
409 SWT.error(SWT.ERROR_INVALID_IMAGE); |
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parents:
diff
changeset
|
410 } |
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parents:
diff
changeset
|
411 ImageData image = ImageData.internal_new( |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
412 width, |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
413 height, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
414 depth, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
415 palette, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
416 4, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
417 null, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
418 0, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
419 null, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
420 null, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
421 -1, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
422 transparentPixel, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
423 SWT.IMAGE_GIF, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
424 left, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
425 top, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
426 disposalMethod, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
427 delayTime); |
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add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
428 LZWCodec codec = new LZWCodec(); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
429 codec.decode(inputStream, loader, image, interlaced, initialCodeSize); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
430 return image; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
431 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
432 |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
433 /** |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
434 * Read a palette from the input stream. |
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add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
435 */ |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
436 PaletteData readPalette(int numColors) { |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
437 byte[] bytes = new byte[numColors * 3]; |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
438 try { |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
439 if (inputStream.read(bytes) !is bytes.length) |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
440 SWT.error(SWT.ERROR_INVALID_IMAGE); |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
441 } catch (IOException e) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
442 SWT.error(SWT.ERROR_IO, e); |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
443 } |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
444 RGB[] colors = new RGB[numColors]; |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
445 for (int i = 0; i < numColors; i++) |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
446 colors[i] = new RGB(bytes[i*3] & 0xFF, |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
447 bytes[i*3+1] & 0xFF, bytes[i*3+2] & 0xFF); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
448 return new PaletteData(colors); |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
449 } |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
450 |
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add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
451 override void unloadIntoByteStream(ImageLoader loader) { |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
452 |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
453 /* Step 1: Acquire GIF parameters. */ |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
454 ImageData[] data = loader.data; |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
455 int frameCount = data.length; |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
456 bool multi = frameCount > 1; |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
457 ImageData firstImage = data[0]; |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
458 int logicalScreenWidth = multi ? loader.logicalScreenWidth : firstImage.width; |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
459 int logicalScreenHeight = multi ? loader.logicalScreenHeight : firstImage.height; |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
460 int backgroundPixel = loader.backgroundPixel; |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
461 int depth = firstImage.depth; |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
462 PaletteData palette = firstImage.palette; |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
463 RGB[] colors = palette.getRGBs(); |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
464 short globalTable = 1; |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
465 |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
466 /* Step 2: Check for validity and global/local color map. */ |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
467 if (!(depth is 1 || depth is 4 || depth is 8)) { |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
468 SWT.error(SWT.ERROR_UNSUPPORTED_DEPTH); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
469 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
470 for (int i=0; i<frameCount; i++) { |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
471 if (data[i].palette.isDirect) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
472 SWT.error(SWT.ERROR_INVALID_IMAGE); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
473 } |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
474 if (multi) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
475 if (!(data[i].height <= logicalScreenHeight && data[i].width <= logicalScreenWidth && data[i].depth is depth)) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
476 SWT.error(SWT.ERROR_INVALID_IMAGE); |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
477 } |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
478 if (globalTable is 1) { |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
479 RGB rgbs[] = data[i].palette.getRGBs(); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
480 if (rgbs.length !is colors.length) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
481 globalTable = 0; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
482 } else { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
483 for (int j=0; j<colors.length; j++) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
484 if (!(rgbs[j].red is colors[j].red && |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
485 rgbs[j].green is colors[j].green && |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
486 rgbs[j].blue is colors[j].blue)) |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
487 globalTable = 0; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
488 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
489 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
490 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
491 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
492 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
493 |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
494 try { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
495 /* Step 3: Write the GIF89a Header and Logical Screen Descriptor. */ |
39
0ecb2b338560
further work on phobosification
Frank Benoit <benoit@tionex.de>
parents:
36
diff
changeset
|
496 outputStream.write(cast(byte[])GIF89a); |
0
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
497 int bitField = globalTable*128 + (depth-1)*16 + depth-1; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
498 outputStream.writeShort(cast(short)logicalScreenWidth); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
499 outputStream.writeShort(cast(short)logicalScreenHeight); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
500 outputStream.write(bitField); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
501 outputStream.write(backgroundPixel); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
502 outputStream.write(0); // Aspect ratio is 1:1 |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
503 } catch (IOException e) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
504 SWT.error(SWT.ERROR_IO, e); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
505 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
506 |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
507 /* Step 4: Write Global Color Table if applicable. */ |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
508 if (globalTable is 1) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
509 writePalette(palette, depth); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
510 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
511 |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
512 /* Step 5: Write Application Extension if applicable. */ |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
513 if (multi) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
514 int repeatCount = loader.repeatCount; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
515 try { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
516 outputStream.write(GIF_EXTENSION_BLOCK_ID); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
517 outputStream.write(GIF_APPLICATION_EXTENSION_BLOCK_ID); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
518 outputStream.write(NETSCAPE2_0.length); |
39
0ecb2b338560
further work on phobosification
Frank Benoit <benoit@tionex.de>
parents:
36
diff
changeset
|
519 outputStream.write(cast(byte[])NETSCAPE2_0); |
0
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
520 outputStream.write(3); // Three bytes follow |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
521 outputStream.write(1); // Extension type |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
522 outputStream.writeShort(cast(short) repeatCount); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
523 outputStream.write(0); // Block terminator |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
524 } catch (IOException e) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
525 SWT.error(SWT.ERROR_IO, e); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
526 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
527 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
528 |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
529 for (int frame=0; frame<frameCount; frame++) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
530 |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
531 /* Step 6: Write Graphics Control Block for each frame if applicable. */ |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
532 if (multi || data[frame].transparentPixel !is -1) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
533 writeGraphicsControlBlock(data[frame]); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
534 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
535 |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
536 /* Step 7: Write Image Header for each frame. */ |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
537 int x = data[frame].x; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
538 int y = data[frame].y; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
539 int width = data[frame].width; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
540 int height = data[frame].height; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
541 try { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
542 outputStream.write(GIF_IMAGE_BLOCK_ID); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
543 byte[] block = new byte[9]; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
544 block[0] = cast(byte)(x & 0xFF); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
545 block[1] = cast(byte)((x >> 8) & 0xFF); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
546 block[2] = cast(byte)(y & 0xFF); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
547 block[3] = cast(byte)((y >> 8) & 0xFF); |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
548 block[4] = cast(byte)(width & 0xFF); |
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549 block[5] = cast(byte)((width >> 8) & 0xFF); |
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550 block[6] = cast(byte)(height & 0xFF); |
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551 block[7] = cast(byte)((height >> 8) & 0xFF); |
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parents:
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552 block[8] = cast(byte)(globalTable is 0 ? (depth-1) | 0x80 : 0x00); |
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553 outputStream.write(block); |
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554 } catch (IOException e) { |
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Frank Benoit <benoit@tionex.de>
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555 SWT.error(SWT.ERROR_IO, e); |
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parents:
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556 } |
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557 |
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558 /* Step 8: Write Local Color Table for each frame if applicable. */ |
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559 if (globalTable is 0) { |
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560 writePalette(data[frame].palette, depth); |
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|
561 } |
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|
562 |
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Frank Benoit <benoit@tionex.de>
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563 /* Step 9: Write the actual data for each frame. */ |
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Frank Benoit <benoit@tionex.de>
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564 try { |
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Frank Benoit <benoit@tionex.de>
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565 outputStream.write(depth); // Minimum LZW Code size |
6dd524f61e62
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566 } catch (IOException e) { |
6dd524f61e62
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567 SWT.error(SWT.ERROR_IO, e); |
6dd524f61e62
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568 } |
6dd524f61e62
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parents:
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569 (new LZWCodec()).encode(outputStream, data[frame]); |
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570 } |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
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571 |
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Frank Benoit <benoit@tionex.de>
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572 /* Step 10: Write GIF terminator. */ |
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Frank Benoit <benoit@tionex.de>
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573 try { |
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Frank Benoit <benoit@tionex.de>
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574 outputStream.write(0x3B); |
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Frank Benoit <benoit@tionex.de>
parents:
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575 } catch (IOException e) { |
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parents:
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576 SWT.error(SWT.ERROR_IO, e); |
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parents:
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|
577 } |
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Frank Benoit <benoit@tionex.de>
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|
578 } |
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Frank Benoit <benoit@tionex.de>
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579 |
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Frank Benoit <benoit@tionex.de>
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|
580 /** |
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parents:
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581 * Write out a GraphicsControlBlock to describe |
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parents:
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582 * the specified device independent image. |
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parents:
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583 */ |
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parents:
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|
584 void writeGraphicsControlBlock(ImageData image) { |
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585 try { |
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diff
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586 outputStream.write(GIF_EXTENSION_BLOCK_ID); |
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parents:
diff
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587 outputStream.write(GIF_GRAPHICS_CONTROL_BLOCK_ID); |
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parents:
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588 byte[] gcBlock = new byte[4]; |
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Frank Benoit <benoit@tionex.de>
parents:
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589 gcBlock[0] = 0; |
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parents:
diff
changeset
|
590 gcBlock[1] = 0; |
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parents:
diff
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591 gcBlock[2] = 0; |
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Frank Benoit <benoit@tionex.de>
parents:
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592 gcBlock[3] = 0; |
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Frank Benoit <benoit@tionex.de>
parents:
diff
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|
593 if (image.transparentPixel !is -1) { |
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Frank Benoit <benoit@tionex.de>
parents:
diff
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|
594 gcBlock[0] = cast(byte)0x01; |
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Frank Benoit <benoit@tionex.de>
parents:
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595 gcBlock[3] = cast(byte)image.transparentPixel; |
6dd524f61e62
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parents:
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596 } |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
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|
597 if (image.disposalMethod !is 0) { |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
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|
598 gcBlock[0] |= cast(byte)((image.disposalMethod & 0x07) << 2); |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
599 } |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
600 if (image.delayTime !is 0) { |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
601 gcBlock[1] = cast(byte)(image.delayTime & 0xFF); |
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parents:
diff
changeset
|
602 gcBlock[2] = cast(byte)((image.delayTime >> 8) & 0xFF); |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
603 } |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
604 outputStream.write(cast(byte)gcBlock.length); |
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Frank Benoit <benoit@tionex.de>
parents:
diff
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|
605 outputStream.write(gcBlock); |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
606 outputStream.write(0); // Block terminator |
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Frank Benoit <benoit@tionex.de>
parents:
diff
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|
607 } catch (IOException e) { |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
608 SWT.error(SWT.ERROR_IO, e); |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
609 } |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
610 } |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
611 |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
612 /** |
6dd524f61e62
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parents:
diff
changeset
|
613 * Write the specified palette to the output stream. |
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parents:
diff
changeset
|
614 */ |
6dd524f61e62
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parents:
diff
changeset
|
615 void writePalette(PaletteData palette, int depth) { |
6dd524f61e62
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parents:
diff
changeset
|
616 byte[] bytes = new byte[(1 << depth) * 3]; |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
617 int offset = 0; |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
618 for (int i = 0; i < palette.colors.length; i++) { |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
619 RGB color = palette.colors[i]; |
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
620 bytes[offset] = cast(byte)color.red; |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
621 bytes[offset + 1] = cast(byte)color.green; |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
622 bytes[offset + 2] = cast(byte)color.blue; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
623 offset += 3; |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
624 } |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
625 try { |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
626 outputStream.write(bytes); |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
627 } catch (IOException e) { |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
628 SWT.error(SWT.ERROR_IO, e); |
6dd524f61e62
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Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
629 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
630 } |
6dd524f61e62
add dwt win and basic java stuff
Frank Benoit <benoit@tionex.de>
parents:
diff
changeset
|
631 } |