Mercurial > projects > dwt-mac
annotate dwt/graphics/PaletteData.d @ 33:965ac0a77267
Ported a couple of modules in dwt.graphics
author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Fri, 12 Sep 2008 13:53:21 +0200 |
parents | 1a8b3cb347e0 |
children | d8635bb48c7c |
rev | line source |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2005 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 * Port to the D programming language: |
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12 * Jacob Carlborg <jacob.carlborg@gmail.com> |
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13 *******************************************************************************/ |
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14 module dwt.graphics.PaletteData; |
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15 |
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16 |
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17 import dwt.DWT; |
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18 |
33
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19 import dwt.dwthelper.utils; |
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20 import dwt.graphics.RGB; |
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21 |
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22 /** |
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23 * Instances of this class describe the color data used by an image. |
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24 * <p> |
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25 * Depending on the depth of the image, the PaletteData can take one |
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26 * of two forms, indicated by the isDirect field: |
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27 * </p> |
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28 * <dl> |
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29 * <dt> |
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30 * <em>isDirect is false</em> |
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31 * </dt> |
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32 * <dd> |
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33 * If isDirect is <code>false</code>, this palette is an indexed |
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34 * palette which maps pixel values to RGBs. The actual RGB values |
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35 * may be retrieved by using the getRGBs() method. |
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36 * </dd> |
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37 * <dt> |
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38 * <em>isDirect is true</em> |
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39 * </dt> |
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40 * <dd> |
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41 * If isDirect is <code>true</code>, this palette is a direct color |
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42 * palette. Instead of containing RGB values, it contains red, |
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43 * green and blue mask and shift information which indicates how |
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44 * the color components may be extracted from a given pixel. |
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45 * This means that the RGB value is actually encoded in the pixel value. |
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46 * <p> |
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47 * In this case, the shift data is the number of bits required to shift |
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48 * the RGB value to the left in order to align the high bit of the |
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49 * corresponding mask with the high bit of the first byte. This number |
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50 * may be negative, so care must be taken when shifting. For example, |
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51 * with a red mask of 0xFF0000, the red shift would be -16. With a red |
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52 * mask of 0x1F, the red shift would be 3. |
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53 * </p> |
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54 * </dd> |
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55 * </dl> |
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56 * |
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57 * @see Image |
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58 * @see RGB |
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59 */ |
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60 |
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61 public final class PaletteData { |
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62 |
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63 /** |
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64 * true if the receiver is a direct palette, |
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65 * and false otherwise |
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66 */ |
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67 public bool isDirect; |
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68 |
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69 /** |
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70 * the RGB values for an indexed palette, where the |
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71 * indices of the array correspond to pixel values |
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72 */ |
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73 public RGB[] colors; |
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74 |
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75 /** |
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76 * the red mask for a direct palette |
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77 */ |
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78 public int redMask; |
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79 |
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80 /** |
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81 * the green mask for a direct palette |
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82 */ |
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83 public int greenMask; |
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84 |
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85 /** |
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86 * the blue mask for a direct palette |
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87 */ |
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88 public int blueMask; |
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89 |
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90 /** |
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91 * the red shift for a direct palette |
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92 */ |
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93 public int redShift; |
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94 |
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95 /** |
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96 * the green shift for a direct palette |
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97 */ |
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98 public int greenShift; |
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99 |
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100 /** |
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101 * the blue shift for a direct palette |
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102 */ |
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103 public int blueShift; |
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104 |
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105 /** |
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106 * Constructs a new indexed palette given an array of RGB values. |
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107 * |
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108 * @param colors the array of <code>RGB</code>s for the palette |
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109 * |
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110 * @exception IllegalArgumentException <ul> |
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111 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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112 * </ul> |
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113 */ |
5 | 114 public this(RGB[] colors) { |
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115 if (colors is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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116 this.colors = colors; |
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117 this.isDirect = false; |
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118 } |
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119 |
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120 /** |
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121 * Constructs a new direct palette given the red, green and blue masks. |
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122 * |
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123 * @param redMask the red mask |
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124 * @param greenMask the green mask |
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125 * @param blueMask the blue mask |
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126 */ |
5 | 127 public this(int redMask, int greenMask, int blueMask) { |
0
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128 this.redMask = redMask; |
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129 this.greenMask = greenMask; |
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130 this.blueMask = blueMask; |
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131 this.isDirect = true; |
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132 this.redShift = shiftForMask(redMask); |
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133 this.greenShift = shiftForMask(greenMask); |
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134 this.blueShift = shiftForMask(blueMask); |
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135 } |
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136 |
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137 /** |
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138 * Returns the pixel value corresponding to the given <code>RGB</code>. |
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139 * |
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140 * @param rgb the RGB to get the pixel value for |
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141 * @return the pixel value for the given RGB |
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142 * |
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143 * @exception IllegalArgumentException <ul> |
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144 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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145 * <li>ERROR_INVALID_ARGUMENT - if the RGB is not found in the palette</li> |
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146 * </ul> |
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147 */ |
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148 public int getPixel(RGB rgb) { |
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149 if (rgb is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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150 if (isDirect) { |
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151 int pixel = 0; |
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152 pixel |= (redShift < 0 ? rgb.red << -redShift : rgb.red >>> redShift) & redMask; |
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153 pixel |= (greenShift < 0 ? rgb.green << -greenShift : rgb.green >>> greenShift) & greenMask; |
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154 pixel |= (blueShift < 0 ? rgb.blue << -blueShift : rgb.blue >>> blueShift) & blueMask; |
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155 return pixel; |
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156 } else { |
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157 for (int i = 0; i < colors.length; i++) { |
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158 if (colors[i].equals(rgb)) return i; |
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159 } |
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160 /* The RGB did not exist in the palette */ |
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161 DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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162 return 0; |
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163 } |
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164 } |
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165 |
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166 /** |
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167 * Returns an <code>RGB</code> corresponding to the given pixel value. |
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168 * |
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169 * @param pixel the pixel to get the RGB value for |
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170 * @return the RGB value for the given pixel |
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171 * |
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172 * @exception IllegalArgumentException <ul> |
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173 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> |
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174 * <li>ERROR_INVALID_ARGUMENT - if the pixel does not exist in the palette</li> |
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175 * </ul> |
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176 */ |
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177 public RGB getRGB(int pixel) { |
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178 if (isDirect) { |
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179 int r = pixel & redMask; |
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180 r = (redShift < 0) ? r >>> -redShift : r << redShift; |
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181 int g = pixel & greenMask; |
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182 g = (greenShift < 0) ? g >>> -greenShift : g << greenShift; |
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183 int b = pixel & blueMask; |
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184 b = (blueShift < 0) ? b >>> -blueShift : b << blueShift; |
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185 return new RGB(r, g, b); |
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186 } else { |
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187 if (pixel < 0 || pixel >= colors.length) { |
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188 DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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189 } |
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190 return colors[pixel]; |
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191 } |
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192 } |
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193 |
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194 /** |
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195 * Returns all the RGB values in the receiver if it is an |
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196 * indexed palette, or null if it is a direct palette. |
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197 * |
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198 * @return the <code>RGB</code>s for the receiver or null |
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199 */ |
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200 public RGB[] getRGBs() { |
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201 return colors; |
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202 } |
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203 |
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204 /** |
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205 * Computes the shift value for a given mask. |
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206 * |
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207 * @param mask the mask to compute the shift for |
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208 * @return the shift amount |
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209 * |
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210 * @see PaletteData |
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211 */ |
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212 int shiftForMask(int mask) { |
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213 for (int i = 31; i >= 0; i--) { |
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214 if (((mask >> i) & 0x1) !is 0) return 7 - i; |
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215 } |
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216 return 32; |
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217 } |
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218 |
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219 } |