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annotate dwt/graphics/PaletteData.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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children 1a8b3cb347e0
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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 module dwt.graphics.PaletteData;
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12
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13 import dwt.dwthelper.utils;
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14
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15
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16 import dwt.DWT;
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17
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18 /**
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19 * Instances of this class describe the color data used by an image.
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20 * <p>
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21 * Depending on the depth of the image, the PaletteData can take one
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22 * of two forms, indicated by the isDirect field:
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23 * </p>
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24 * <dl>
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25 * <dt>
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26 * <em>isDirect is false</em>
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27 * </dt>
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28 * <dd>
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29 * If isDirect is <code>false</code>, this palette is an indexed
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30 * palette which maps pixel values to RGBs. The actual RGB values
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31 * may be retrieved by using the getRGBs() method.
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32 * </dd>
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33 * <dt>
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34 * <em>isDirect is true</em>
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35 * </dt>
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36 * <dd>
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37 * If isDirect is <code>true</code>, this palette is a direct color
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38 * palette. Instead of containing RGB values, it contains red,
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39 * green and blue mask and shift information which indicates how
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40 * the color components may be extracted from a given pixel.
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41 * This means that the RGB value is actually encoded in the pixel value.
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42 * <p>
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43 * In this case, the shift data is the number of bits required to shift
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44 * the RGB value to the left in order to align the high bit of the
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45 * corresponding mask with the high bit of the first byte. This number
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46 * may be negative, so care must be taken when shifting. For example,
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47 * with a red mask of 0xFF0000, the red shift would be -16. With a red
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48 * mask of 0x1F, the red shift would be 3.
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49 * </p>
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50 * </dd>
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51 * </dl>
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52 *
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53 * @see Image
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54 * @see RGB
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55 */
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56
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57 public final class PaletteData {
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58
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59 /**
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60 * true if the receiver is a direct palette,
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61 * and false otherwise
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62 */
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63 public bool isDirect;
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64
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65 /**
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66 * the RGB values for an indexed palette, where the
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67 * indices of the array correspond to pixel values
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68 */
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69 public RGB[] colors;
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70
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71 /**
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72 * the red mask for a direct palette
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73 */
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74 public int redMask;
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75
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76 /**
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77 * the green mask for a direct palette
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78 */
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79 public int greenMask;
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80
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81 /**
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82 * the blue mask for a direct palette
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83 */
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84 public int blueMask;
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85
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86 /**
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87 * the red shift for a direct palette
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88 */
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89 public int redShift;
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90
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91 /**
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92 * the green shift for a direct palette
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93 */
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94 public int greenShift;
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95
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96 /**
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97 * the blue shift for a direct palette
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98 */
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99 public int blueShift;
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100
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101 /**
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102 * Constructs a new indexed palette given an array of RGB values.
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103 *
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104 * @param colors the array of <code>RGB</code>s for the palette
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105 *
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106 * @exception IllegalArgumentException <ul>
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107 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
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108 * </ul>
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109 */
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110 public PaletteData(RGB[] colors) {
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111 if (colors is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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112 this.colors = colors;
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113 this.isDirect = false;
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114 }
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115
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116 /**
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117 * Constructs a new direct palette given the red, green and blue masks.
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118 *
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119 * @param redMask the red mask
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120 * @param greenMask the green mask
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121 * @param blueMask the blue mask
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122 */
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123 public PaletteData(int redMask, int greenMask, int blueMask) {
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124 this.redMask = redMask;
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125 this.greenMask = greenMask;
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126 this.blueMask = blueMask;
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127 this.isDirect = true;
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128 this.redShift = shiftForMask(redMask);
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129 this.greenShift = shiftForMask(greenMask);
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130 this.blueShift = shiftForMask(blueMask);
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131 }
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132
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133 /**
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134 * Returns the pixel value corresponding to the given <code>RGB</code>.
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135 *
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136 * @param rgb the RGB to get the pixel value for
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137 * @return the pixel value for the given RGB
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138 *
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139 * @exception IllegalArgumentException <ul>
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140 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
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141 * <li>ERROR_INVALID_ARGUMENT - if the RGB is not found in the palette</li>
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142 * </ul>
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143 */
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144 public int getPixel(RGB rgb) {
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145 if (rgb is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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146 if (isDirect) {
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147 int pixel = 0;
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148 pixel |= (redShift < 0 ? rgb.red << -redShift : rgb.red >>> redShift) & redMask;
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149 pixel |= (greenShift < 0 ? rgb.green << -greenShift : rgb.green >>> greenShift) & greenMask;
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150 pixel |= (blueShift < 0 ? rgb.blue << -blueShift : rgb.blue >>> blueShift) & blueMask;
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151 return pixel;
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152 } else {
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153 for (int i = 0; i < colors.length; i++) {
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154 if (colors[i].equals(rgb)) return i;
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155 }
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156 /* The RGB did not exist in the palette */
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157 DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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158 return 0;
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159 }
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160 }
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161
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162 /**
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163 * Returns an <code>RGB</code> corresponding to the given pixel value.
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164 *
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165 * @param pixel the pixel to get the RGB value for
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166 * @return the RGB value for the given pixel
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167 *
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168 * @exception IllegalArgumentException <ul>
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169 * <li>ERROR_NULL_ARGUMENT - if the argument is null</li>
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170 * <li>ERROR_INVALID_ARGUMENT - if the pixel does not exist in the palette</li>
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171 * </ul>
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172 */
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173 public RGB getRGB(int pixel) {
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174 if (isDirect) {
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175 int r = pixel & redMask;
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176 r = (redShift < 0) ? r >>> -redShift : r << redShift;
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177 int g = pixel & greenMask;
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178 g = (greenShift < 0) ? g >>> -greenShift : g << greenShift;
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179 int b = pixel & blueMask;
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180 b = (blueShift < 0) ? b >>> -blueShift : b << blueShift;
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181 return new RGB(r, g, b);
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182 } else {
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183 if (pixel < 0 || pixel >= colors.length) {
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184 DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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185 }
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186 return colors[pixel];
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187 }
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188 }
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189
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190 /**
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191 * Returns all the RGB values in the receiver if it is an
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192 * indexed palette, or null if it is a direct palette.
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193 *
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194 * @return the <code>RGB</code>s for the receiver or null
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195 */
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196 public RGB[] getRGBs() {
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197 return colors;
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198 }
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199
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200 /**
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201 * Computes the shift value for a given mask.
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202 *
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203 * @param mask the mask to compute the shift for
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204 * @return the shift amount
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205 *
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206 * @see PaletteData
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207 */
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208 int shiftForMask(int mask) {
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209 for (int i = 31; i >= 0; i--) {
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210 if (((mask >> i) & 0x1) !is 0) return 7 - i;
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211 }
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212 return 32;
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213 }
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214
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215 }