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annotate dwt/internal/image/PngIhdrChunk.d @ 34:5123b17c98ef

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Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sun, 14 Sep 2008 01:45:57 +0200
parents 1a8b3cb347e0
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * 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 dwt.internal.image.PngIhdrChunk;
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15 import dwt.dwthelper.utils;
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18 import dwt.DWT;
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19 import dwt.graphics.PaletteData;
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20 import dwt.graphics.RGB;
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21 import dwt.internal.image.PngFileReadState;
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22 import dwt.internal.image.PngIhdrChunk;
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23 import dwt.internal.image.PngChunk;
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24 import tango.text.convert.Format;
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26 class PngIhdrChunk : PngChunk {
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27 static const int IHDR_DATA_LENGTH = 13;
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29 static const int WIDTH_DATA_OFFSET = DATA_OFFSET + 0;
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30 static const int HEIGHT_DATA_OFFSET = DATA_OFFSET + 4;
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31 static const int BIT_DEPTH_OFFSET = DATA_OFFSET + 8;
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32 static const int COLOR_TYPE_OFFSET = DATA_OFFSET + 9;
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33 static const int COMPRESSION_METHOD_OFFSET = DATA_OFFSET + 10;
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34 static const int FILTER_METHOD_OFFSET = DATA_OFFSET + 11;
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35 static const int INTERLACE_METHOD_OFFSET = DATA_OFFSET + 12;
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37 static const byte COLOR_TYPE_GRAYSCALE = 0;
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38 static const byte COLOR_TYPE_RGB = 2;
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39 static const byte COLOR_TYPE_PALETTE = 3;
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40 static const byte COLOR_TYPE_GRAYSCALE_WITH_ALPHA = 4;
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41 static const byte COLOR_TYPE_RGB_WITH_ALPHA = 6;
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43 static const int INTERLACE_METHOD_NONE = 0;
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44 static const int INTERLACE_METHOD_ADAM7 = 1;
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46 static const int FILTER_NONE = 0;
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47 static const int FILTER_SUB = 1;
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48 static const int FILTER_UP = 2;
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49 static const int FILTER_AVERAGE = 3;
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50 static const int FILTER_PAETH = 4;
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52 static const byte[] ValidBitDepths = [ cast(byte)1, 2, 4, 8, 16];
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53 static const byte[] ValidColorTypes = [ cast(byte)0, 2, 3, 4, 6];
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54
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55 int width, height;
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56 byte bitDepth, colorType, compressionMethod, filterMethod, interlaceMethod;
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58 this(int width, int height, byte bitDepth, byte colorType, byte compressionMethod, byte filterMethod, byte interlaceMethod) {
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59 super(IHDR_DATA_LENGTH);
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60 setType(TYPE_IHDR);
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61 setWidth(width);
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62 setHeight(height);
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63 setBitDepth(bitDepth);
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64 setColorType(colorType);
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65 setCompressionMethod(compressionMethod);
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66 setFilterMethod(filterMethod);
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67 setInterlaceMethod(interlaceMethod);
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68 setCRC(computeCRC());
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69 }
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70
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71 /**
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72 * Construct a PNGChunk using the reference bytes
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73 * given.
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74 */
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75 this(byte[] reference) {
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76 super(reference);
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77 if (reference.length <= IHDR_DATA_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE);
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78 width = getInt32(WIDTH_DATA_OFFSET);
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79 height = getInt32(HEIGHT_DATA_OFFSET);
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80 bitDepth = reference[BIT_DEPTH_OFFSET];
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81 colorType = reference[COLOR_TYPE_OFFSET];
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82 compressionMethod = reference[COMPRESSION_METHOD_OFFSET];
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83 filterMethod = reference[FILTER_METHOD_OFFSET];
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84 interlaceMethod = reference[INTERLACE_METHOD_OFFSET];
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85 }
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86
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87 override int getChunkType() {
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88 return CHUNK_IHDR;
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89 }
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90
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91 /**
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92 * Get the image's width in pixels.
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93 */
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94 int getWidth() {
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95 return width;
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96 }
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97
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98 /**
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99 * Set the image's width in pixels.
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100 */
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101 void setWidth(int value) {
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102 setInt32(WIDTH_DATA_OFFSET, value);
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103 width = value;
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104 }
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105
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106 /**
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107 * Get the image's height in pixels.
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108 */
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109 int getHeight() {
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110 return height;
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111 }
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112
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113 /**
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114 * Set the image's height in pixels.
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115 */
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116 void setHeight(int value) {
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117 setInt32(HEIGHT_DATA_OFFSET, value);
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118 height = value;
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119 }
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120
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121 /**
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122 * Get the image's bit depth.
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123 * This is limited to the values 1, 2, 4, 8, or 16.
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124 */
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125 byte getBitDepth() {
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126 return bitDepth;
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127 }
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128
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129 /**
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130 * Set the image's bit depth.
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131 * This is limited to the values 1, 2, 4, 8, or 16.
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132 */
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133 void setBitDepth(byte value) {
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134 reference[BIT_DEPTH_OFFSET] = value;
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135 bitDepth = value;
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136 }
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137
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138 /**
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139 * Get the image's color type.
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140 * This is limited to the values:
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141 * 0 - Grayscale image.
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142 * 2 - RGB triple.
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143 * 3 - Palette.
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144 * 4 - Grayscale with Alpha channel.
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145 * 6 - RGB with Alpha channel.
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146 */
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147 byte getColorType() {
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148 return colorType;
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149 }
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150
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151 /**
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152 * Set the image's color type.
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153 * This is limited to the values:
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154 * 0 - Grayscale image.
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155 * 2 - RGB triple.
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156 * 3 - Palette.
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157 * 4 - Grayscale with Alpha channel.
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158 * 6 - RGB with Alpha channel.
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159 */
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160 void setColorType(byte value) {
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161 reference[COLOR_TYPE_OFFSET] = value;
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162 colorType = value;
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163 }
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164
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165 /**
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166 * Get the image's compression method.
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167 * This value must be 0.
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168 */
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169 byte getCompressionMethod() {
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170 return compressionMethod;
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171 }
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172
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173 /**
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174 * Set the image's compression method.
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175 * This value must be 0.
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176 */
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177 void setCompressionMethod(byte value) {
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178 reference[COMPRESSION_METHOD_OFFSET] = value;
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179 compressionMethod = value;
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180 }
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181
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182 /**
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183 * Get the image's filter method.
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184 * This value must be 0.
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185 */
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186 byte getFilterMethod() {
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187 return filterMethod;
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188 }
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189
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190 /**
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191 * Set the image's filter method.
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192 * This value must be 0.
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193 */
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194 void setFilterMethod(byte value) {
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195 reference[FILTER_METHOD_OFFSET] = value;
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196 filterMethod = value;
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197 }
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198
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199 /**
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200 * Get the image's interlace method.
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201 * This value is limited to:
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202 * 0 - No interlacing used.
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203 * 1 - Adam7 interlacing used.
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204 */
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205 byte getInterlaceMethod() {
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206 return interlaceMethod;
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207 }
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208
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209 /**
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210 * Set the image's interlace method.
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211 * This value is limited to:
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212 * 0 - No interlacing used.
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213 * 1 - Adam7 interlacing used.
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214 */
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215 void setInterlaceMethod(byte value) {
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216 reference[INTERLACE_METHOD_OFFSET] = value;
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217 interlaceMethod = value;
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218 }
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219
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220 /**
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221 * Answer whether the chunk is a valid IHDR chunk.
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222 */
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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223 override void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
0
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224 // An IHDR chunk is invalid if any other chunk has
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225 // been read.
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5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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226 if (readState.readIHDR
0
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227 || readState.readPLTE
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228 || readState.readIDAT
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5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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229 || readState.readIEND)
0
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230 {
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231 DWT.error(DWT.ERROR_INVALID_IMAGE);
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232 } else {
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233 readState.readIHDR = true;
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234 }
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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235
0
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236 super.validate(readState, headerChunk);
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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237
0
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238 if (length !is IHDR_DATA_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE);
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239 if (compressionMethod !is 0) DWT.error(DWT.ERROR_INVALID_IMAGE);
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240 if (interlaceMethod !is INTERLACE_METHOD_NONE &&
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241 interlaceMethod !is INTERLACE_METHOD_ADAM7) {
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242 DWT.error(DWT.ERROR_INVALID_IMAGE);
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243 }
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
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244
0
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245 bool colorTypeIsValid = false;
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246 for (int i = 0; i < ValidColorTypes.length; i++) {
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247 if (ValidColorTypes[i] is colorType) {
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diff changeset
248 colorTypeIsValid = true;
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parents:
diff changeset
249 break;
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parents:
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250 }
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parents:
diff changeset
251 }
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parents:
diff changeset
252 if (!colorTypeIsValid) DWT.error(DWT.ERROR_INVALID_IMAGE);
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parents:
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253
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parents:
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254 bool bitDepthIsValid = false;
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parents:
diff changeset
255 for (int i = 0; i < ValidBitDepths.length; i++) {
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parents:
diff changeset
256 if (ValidBitDepths[i] is bitDepth) {
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parents:
diff changeset
257 bitDepthIsValid = true;
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parents:
diff changeset
258 break;
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parents:
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259 }
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parents:
diff changeset
260 }
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parents:
diff changeset
261 if (!bitDepthIsValid) DWT.error(DWT.ERROR_INVALID_IMAGE);
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
diff changeset
262
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
diff changeset
263 if ((colorType is COLOR_TYPE_RGB
0
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parents:
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264 || colorType is COLOR_TYPE_RGB_WITH_ALPHA
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parents:
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265 || colorType is COLOR_TYPE_GRAYSCALE_WITH_ALPHA)
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
diff changeset
266 && bitDepth < 8)
0
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parents:
diff changeset
267 {
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diff changeset
268 DWT.error(DWT.ERROR_INVALID_IMAGE);
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parents:
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269 }
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
diff changeset
270
0
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parents:
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271 if (colorType is COLOR_TYPE_PALETTE && bitDepth > 8) {
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272 DWT.error(DWT.ERROR_INVALID_IMAGE);
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parents:
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273 }
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parents:
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274 }
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parents:
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275
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276 String getColorTypeString() {
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277 switch (colorType) {
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parents:
diff changeset
278 case COLOR_TYPE_GRAYSCALE: return "Grayscale";
34
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
diff changeset
279 case COLOR_TYPE_RGB: return "RGB";
0
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parents:
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280 case COLOR_TYPE_PALETTE: return "Palette";
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parents:
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281 case COLOR_TYPE_GRAYSCALE_WITH_ALPHA: return "Grayscale with Alpha";
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parents:
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282 case COLOR_TYPE_RGB_WITH_ALPHA: return "RGB with Alpha";
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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diff changeset
283 default: return "Unknown - " ~ cast(char)colorType;
0
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parents:
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284 }
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parents:
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285 }
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parents:
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286
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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287 String getFilterMethodString() {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
288 switch (filterMethod) {
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parents:
diff changeset
289 case FILTER_NONE: return "None";
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parents:
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290 case FILTER_SUB: return "Sub";
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parents:
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291 case FILTER_UP: return "Up";
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parents:
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292 case FILTER_AVERAGE: return "Average";
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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293 case FILTER_PAETH: return "Paeth";
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parents:
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294 default: return "Unknown";
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parents:
diff changeset
295 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
296 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
297
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
298 String getInterlaceMethodString() {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
299 switch (interlaceMethod) {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
300 case INTERLACE_METHOD_NONE: return "Not Interlaced";
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
301 case INTERLACE_METHOD_ADAM7: return "Interlaced - ADAM7";
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
302 default: return "Unknown";
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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303 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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304 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
305
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
diff changeset
306 override String contributeToString() {
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
diff changeset
307 return Format( "\n\tWidth: {}\n\tHeight: {}\n\tBit Depth: {}\n\tColor Type: {}\n\tCompression Method: {}\n\tFilter Method: {}\n\tInterlace Method: {}",
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
diff changeset
308 width, height, bitDepth, getColorTypeString(), compressionMethod, getFilterMethodString(), getInterlaceMethodString() );
0
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parents:
diff changeset
309 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
310
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
311 bool getMustHavePalette() {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
312 return colorType is COLOR_TYPE_PALETTE;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
313 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
314
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
315 bool getCanHavePalette() {
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
diff changeset
316 return colorType !is COLOR_TYPE_GRAYSCALE &&
0
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parents:
diff changeset
317 colorType !is COLOR_TYPE_GRAYSCALE_WITH_ALPHA;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
318 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
319
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
320 /**
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
321 * Answer the pixel size in bits based on the color type
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
322 * and bit depth.
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
323 */
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
324 int getBitsPerPixel() {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
325 switch (colorType) {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
326 case COLOR_TYPE_RGB_WITH_ALPHA:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
327 return 4 * bitDepth;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
328 case COLOR_TYPE_RGB:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
329 return 3 * bitDepth;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
330 case COLOR_TYPE_GRAYSCALE_WITH_ALPHA:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
331 return 2 * bitDepth;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
332 case COLOR_TYPE_GRAYSCALE:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
333 case COLOR_TYPE_PALETTE:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
334 return bitDepth;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
335 default:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
336 DWT.error(DWT.ERROR_INVALID_IMAGE);
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
337 return 0;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
338 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
339 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
340
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
341 /**
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
342 * Answer the pixel size in bits based on the color type
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
343 * and bit depth.
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
344 */
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
345 int getSwtBitsPerPixel() {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
346 switch (colorType) {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
347 case COLOR_TYPE_RGB_WITH_ALPHA:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
348 case COLOR_TYPE_RGB:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
349 case COLOR_TYPE_GRAYSCALE_WITH_ALPHA:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
350 return 24;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
351 case COLOR_TYPE_GRAYSCALE:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
352 case COLOR_TYPE_PALETTE:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
353 return Math.min(bitDepth, 8);
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
354 default:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
355 DWT.error(DWT.ERROR_INVALID_IMAGE);
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
356 return 0;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
357 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
358 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
359
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
360 int getFilterByteOffset() {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
361 if (bitDepth < 8) return 1;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
362 return getBitsPerPixel() / 8;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
363 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
364
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
365 bool usesDirectColor() {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
366 switch (colorType) {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
367 case COLOR_TYPE_GRAYSCALE:
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
368 case COLOR_TYPE_GRAYSCALE_WITH_ALPHA:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
369 case COLOR_TYPE_RGB:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
370 case COLOR_TYPE_RGB_WITH_ALPHA:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
371 return true;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
372 default:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
373 return false;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
374 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
375 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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376
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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377 PaletteData createGrayscalePalette() {
380af2bdd8e5 Upload of whole dwt tree
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378 int depth = Math.min(bitDepth, 8);
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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379 int max = (1 << depth) - 1;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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380 int delta = 255 / max;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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381 int gray = 0;
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
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382 RGB[] rgbs = new RGB[max + 1];
0
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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383 for (int i = 0; i <= max; i++) {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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384 rgbs[i] = new RGB(gray, gray, gray);
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385 gray += delta;
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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386 }
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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387 return new PaletteData(rgbs);
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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388 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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389
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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390 PaletteData getPaletteData() {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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391 switch (colorType) {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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392 case COLOR_TYPE_GRAYSCALE:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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393 return createGrayscalePalette();
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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394 case COLOR_TYPE_GRAYSCALE_WITH_ALPHA:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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395 case COLOR_TYPE_RGB:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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396 case COLOR_TYPE_RGB_WITH_ALPHA:
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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397 return new PaletteData(0xFF0000, 0xFF00, 0xFF);
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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398 default:
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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399 return null;
34
5123b17c98ef Ported dwt.events.*, dwt.graphics.GC, Region, dwt.internal.image.*
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents: 5
diff changeset
400 }
0
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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401 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
402
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
403
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
404
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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405 }