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annotate dwt/graphics/PaletteData.d @ 259:c0d810de7093
Update SWT 3.4M7 to 3.4
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Sun, 29 Jun 2008 14:33:38 +0200 |
| parents | df23b11d0b70 |
| children |
| rev | line source |
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| 72 | 1 /******************************************************************************* |
| 259 | 2 * Copyright (c) 2000, 2008 IBM Corporation and others. |
| 5 | 3 * All rights reserved. This program and the accompanying materials |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 72 | 10 * Port to the D programming language: |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 5 | 12 *******************************************************************************/ |
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13 module dwt.graphics.PaletteData; |
| 5 | 14 |
| 15 | |
| 71 | 16 import dwt.DWT; |
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17 import dwt.graphics.RGB; |
| 5 | 18 |
| 19 /** | |
| 20 * Instances of this class describe the color data used by an image. | |
| 21 * <p> | |
| 22 * Depending on the depth of the image, the PaletteData can take one | |
| 23 * of two forms, indicated by the isDirect field: | |
| 24 * </p> | |
| 25 * <dl> | |
| 26 * <dt> | |
| 27 * <em>isDirect is false</em> | |
| 28 * </dt> | |
| 29 * <dd> | |
| 30 * If isDirect is <code>false</code>, this palette is an indexed | |
| 31 * palette which maps pixel values to RGBs. The actual RGB values | |
| 32 * may be retrieved by using the getRGBs() method. | |
| 33 * </dd> | |
| 34 * <dt> | |
| 35 * <em>isDirect is true</em> | |
| 36 * </dt> | |
| 37 * <dd> | |
| 38 * If isDirect is <code>true</code>, this palette is a direct color | |
| 39 * palette. Instead of containing RGB values, it contains red, | |
| 40 * green and blue mask and shift information which indicates how | |
| 41 * the color components may be extracted from a given pixel. | |
| 42 * This means that the RGB value is actually encoded in the pixel value. | |
| 43 * <p> | |
| 44 * In this case, the shift data is the number of bits required to shift | |
| 45 * the RGB value to the left in order to align the high bit of the | |
| 46 * corresponding mask with the high bit of the first byte. This number | |
| 47 * may be negative, so care must be taken when shifting. For example, | |
| 48 * with a red mask of 0xFF0000, the red shift would be -16. With a red | |
| 49 * mask of 0x1F, the red shift would be 3. | |
| 50 * </p> | |
| 51 * </dd> | |
| 52 * </dl> | |
| 53 * | |
| 54 * @see Image | |
| 55 * @see RGB | |
| 259 | 56 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| 5 | 57 */ |
| 58 | |
| 59 public final class PaletteData { | |
| 60 | |
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61 /** |
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62 * true if the receiver is a direct palette, |
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63 * and false otherwise |
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64 */ |
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65 public bool isDirect; |
| 5 | 66 |
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67 /** |
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68 * the RGB values for an indexed palette, where the |
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69 * indices of the array correspond to pixel values |
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70 */ |
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71 public RGB[] colors; |
| 5 | 72 |
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73 /** |
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74 * the red mask for a direct palette |
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75 */ |
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76 public int redMask; |
| 5 | 77 |
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78 /** |
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79 * the green mask for a direct palette |
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80 */ |
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81 public int greenMask; |
| 5 | 82 |
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83 /** |
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84 * the blue mask for a direct palette |
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85 */ |
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86 public int blueMask; |
| 5 | 87 |
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88 /** |
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89 * the red shift for a direct palette |
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90 */ |
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91 public int redShift; |
| 5 | 92 |
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93 /** |
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94 * the green shift for a direct palette |
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95 */ |
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96 public int greenShift; |
| 5 | 97 |
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98 /** |
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99 * the blue shift for a direct palette |
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100 */ |
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101 public int blueShift; |
| 5 | 102 |
| 103 /** | |
| 104 * Constructs a new indexed palette given an array of RGB values. | |
| 105 * | |
| 106 * @param colors the array of <code>RGB</code>s for the palette | |
| 107 * | |
| 108 * @exception IllegalArgumentException <ul> | |
| 109 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> | |
| 110 * </ul> | |
| 111 */ | |
| 112 public this(RGB[] colors) { | |
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113 if (colors is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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114 this.colors = colors; |
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115 this.isDirect = false; |
| 5 | 116 } |
| 117 | |
| 118 /** | |
| 119 * Constructs a new direct palette given the red, green and blue masks. | |
| 120 * | |
| 121 * @param redMask the red mask | |
| 122 * @param greenMask the green mask | |
| 123 * @param blueMask the blue mask | |
| 124 */ | |
| 125 public this(int redMask, int greenMask, int blueMask) { | |
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126 this.redMask = redMask; |
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127 this.greenMask = greenMask; |
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128 this.blueMask = blueMask; |
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129 this.isDirect = true; |
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130 this.redShift = shiftForMask(redMask); |
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131 this.greenShift = shiftForMask(greenMask); |
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132 this.blueShift = shiftForMask(blueMask); |
| 5 | 133 } |
| 134 | |
| 135 /** | |
| 136 * Returns the pixel value corresponding to the given <code>RGB</code>. | |
| 137 * | |
| 138 * @param rgb the RGB to get the pixel value for | |
| 139 * @return the pixel value for the given RGB | |
| 140 * | |
| 141 * @exception IllegalArgumentException <ul> | |
| 142 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> | |
| 143 * <li>ERROR_INVALID_ARGUMENT - if the RGB is not found in the palette</li> | |
| 144 * </ul> | |
| 145 */ | |
| 146 public int getPixel(RGB rgb) { | |
| 71 | 147 if (rgb is null) DWT.error(DWT.ERROR_NULL_ARGUMENT); |
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148 if (isDirect) { |
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149 int pixel = 0; |
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150 pixel |= (redShift < 0 ? rgb.red << -redShift : rgb.red >>> redShift) & redMask; |
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151 pixel |= (greenShift < 0 ? rgb.green << -greenShift : rgb.green >>> greenShift) & greenMask; |
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152 pixel |= (blueShift < 0 ? rgb.blue << -blueShift : rgb.blue >>> blueShift) & blueMask; |
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153 return pixel; |
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154 } else { |
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155 for (int i = 0; i < colors.length; i++) { |
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156 if (colors[i].opEquals(rgb) ) return i; |
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157 } |
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158 /* The RGB did not exist in the palette */ |
| 71 | 159 DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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160 return 0; |
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161 } |
| 5 | 162 } |
| 163 | |
| 164 /** | |
| 165 * Returns an <code>RGB</code> corresponding to the given pixel value. | |
| 166 * | |
| 167 * @param pixel the pixel to get the RGB value for | |
| 168 * @return the RGB value for the given pixel | |
| 169 * | |
| 170 * @exception IllegalArgumentException <ul> | |
| 171 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li> | |
| 172 * <li>ERROR_INVALID_ARGUMENT - if the pixel does not exist in the palette</li> | |
| 173 * </ul> | |
| 174 */ | |
| 175 public RGB getRGB(int pixel) { | |
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176 if (isDirect) { |
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177 int r = pixel & redMask; |
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178 r = (redShift < 0) ? r >>> -redShift : r << redShift; |
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179 int g = pixel & greenMask; |
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180 g = (greenShift < 0) ? g >>> -greenShift : g << greenShift; |
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181 int b = pixel & blueMask; |
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182 b = (blueShift < 0) ? b >>> -blueShift : b << blueShift; |
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183 return new RGB(r, g, b); |
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184 } else { |
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185 if (pixel < 0 || pixel >= colors.length) { |
| 71 | 186 DWT.error(DWT.ERROR_INVALID_ARGUMENT); |
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187 } |
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188 return colors[pixel]; |
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189 } |
| 5 | 190 } |
| 191 | |
| 192 /** | |
| 193 * Returns all the RGB values in the receiver if it is an | |
| 194 * indexed palette, or null if it is a direct palette. | |
| 195 * | |
| 196 * @return the <code>RGB</code>s for the receiver or null | |
| 197 */ | |
| 198 public RGB[] getRGBs() { | |
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199 return colors; |
| 5 | 200 } |
| 201 | |
| 202 /** | |
| 203 * Computes the shift value for a given mask. | |
| 204 * | |
| 205 * @param mask the mask to compute the shift for | |
| 206 * @return the shift amount | |
| 207 * | |
| 208 * @see PaletteData | |
| 209 */ | |
| 210 int shiftForMask(int mask) { | |
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211 for (int i = 31; i >= 0; i--) { |
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212 if (((mask >> i) & 0x1) !is 0) return 7 - i; |
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213 } |
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|
214 return 32; |
| 5 | 215 } |
| 216 | |
| 217 } |