Mercurial > projects > dwt-mac
annotate dwt/internal/image/PNGFileFormat.d @ 0:380af2bdd8e5
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author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Sat, 09 Aug 2008 17:00:02 +0200 |
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children | b903c16b6f48 |
rev | line source |
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0
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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 *******************************************************************************/ |
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11 module dwt.internal.image; |
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12 |
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13 |
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14 import java.io.IOException; |
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15 import java.io.InputStream; |
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16 |
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17 import dwt.DWT; |
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18 import dwt.graphics.ImageData; |
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19 import dwt.graphics.ImageLoader; |
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20 import dwt.graphics.ImageLoaderEvent; |
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21 import dwt.graphics.PaletteData; |
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22 import dwt.internal.Compatibility; |
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23 |
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24 public final class PNGFileFormat : FileFormat { |
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25 static final int SIGNATURE_LENGTH = 8; |
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26 static final int PRIME = 65521; |
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27 PngIhdrChunk headerChunk; |
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28 PngPlteChunk paletteChunk; |
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29 ImageData imageData; |
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30 byte[] data; |
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31 byte[] alphaPalette; |
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32 byte headerByte1; |
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33 byte headerByte2; |
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34 int adler; |
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35 |
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36 /** |
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37 * Skip over signature data. This has already been |
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38 * verified in isFileFormat(). |
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39 */ |
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40 void readSignature() throws IOException { |
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41 byte[] signature = new byte[SIGNATURE_LENGTH]; |
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42 inputStream.read(signature); |
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43 } |
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44 /** |
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45 * Load the PNG image from the byte stream. |
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46 */ |
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47 ImageData[] loadFromByteStream() { |
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48 try { |
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49 readSignature(); |
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50 PngChunkReader chunkReader = new PngChunkReader(inputStream); |
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51 headerChunk = chunkReader.getIhdrChunk(); |
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52 int width = headerChunk.getWidth(), height = headerChunk.getHeight(); |
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53 if (width <= 0 || height <= 0) DWT.error(DWT.ERROR_INVALID_IMAGE); |
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54 int imageSize = getAlignedBytesPerRow() * height; |
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55 data = new byte[imageSize]; |
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56 imageData = ImageData.internal_new( |
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57 width, |
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58 height, |
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59 headerChunk.getSwtBitsPerPixel(), |
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60 new PaletteData(0, 0, 0), |
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61 4, |
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62 data, |
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63 0, |
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64 null, |
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65 null, |
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66 -1, |
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67 -1, |
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68 DWT.IMAGE_PNG, |
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69 0, |
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70 0, |
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71 0, |
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72 0); |
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73 |
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74 if (headerChunk.usesDirectColor()) { |
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75 imageData.palette = headerChunk.getPaletteData(); |
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76 } |
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77 |
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78 // Read and process chunks until the IEND chunk is encountered. |
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79 while (chunkReader.hasMoreChunks()) { |
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80 readNextChunk(chunkReader); |
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81 } |
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82 |
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83 return new ImageData[] {imageData}; |
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84 } catch (IOException e) { |
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85 DWT.error(DWT.ERROR_INVALID_IMAGE); |
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86 return null; |
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87 } |
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88 } |
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89 /** |
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90 * Read and handle the next chunk of data from the |
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91 * PNG file. |
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92 */ |
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93 void readNextChunk(PngChunkReader chunkReader) throws IOException { |
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94 PngChunk chunk = chunkReader.readNextChunk(); |
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95 switch (chunk.getChunkType()) { |
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96 case PngChunk.CHUNK_IEND: |
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97 break; |
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98 case PngChunk.CHUNK_PLTE: |
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99 if (!headerChunk.usesDirectColor()) { |
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100 paletteChunk = (PngPlteChunk) chunk; |
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101 imageData.palette = paletteChunk.getPaletteData(); |
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102 } |
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103 break; |
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104 case PngChunk.CHUNK_tRNS: |
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105 PngTrnsChunk trnsChunk = (PngTrnsChunk) chunk; |
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106 if (trnsChunk.getTransparencyType(headerChunk) is |
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107 PngTrnsChunk.TRANSPARENCY_TYPE_PIXEL) |
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108 { |
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109 imageData.transparentPixel = |
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110 trnsChunk.getSwtTransparentPixel(headerChunk); |
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111 } else { |
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112 alphaPalette = trnsChunk.getAlphaValues(headerChunk, paletteChunk); |
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113 int transparentCount = 0, transparentPixel = -1; |
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114 for (int i = 0; i < alphaPalette.length; i++) { |
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115 if ((alphaPalette[i] & 0xFF) !is 255) { |
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116 transparentCount++; |
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117 transparentPixel = i; |
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118 } |
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119 } |
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120 if (transparentCount is 0) { |
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121 alphaPalette = null; |
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122 } else if (transparentCount is 1 && alphaPalette[transparentPixel] is 0) { |
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123 alphaPalette = null; |
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124 imageData.transparentPixel = transparentPixel; |
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125 } |
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126 } |
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127 break; |
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128 case PngChunk.CHUNK_IDAT: |
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129 if (chunkReader.readPixelData()) { |
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130 // All IDAT chunks in an image file must be |
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131 // sequential. If the pixel data has already |
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132 // been read and another IDAT block is encountered, |
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133 // then this is an invalid image. |
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134 DWT.error(DWT.ERROR_INVALID_IMAGE); |
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135 } else { |
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136 // Read in the pixel data for the image. This should |
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137 // go through all the image's IDAT chunks. |
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138 PngIdatChunk dataChunk = (PngIdatChunk) chunk; |
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139 readPixelData(dataChunk, chunkReader); |
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140 } |
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141 break; |
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142 default: |
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143 if (chunk.isCritical()) { |
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144 // All critical chunks must be supported. |
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145 DWT.error(DWT.ERROR_NOT_IMPLEMENTED); |
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146 } |
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147 } |
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148 } |
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149 void unloadIntoByteStream(ImageLoader loader) { |
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150 PngEncoder encoder = new PngEncoder(loader); |
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151 encoder.encode(outputStream); |
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152 } |
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153 bool isFileFormat(LEDataInputStream stream) { |
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154 try { |
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155 byte[] signature = new byte[SIGNATURE_LENGTH]; |
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156 stream.read(signature); |
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157 stream.unread(signature); |
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158 if ((signature[0] & 0xFF) !is 137) return false; //137 |
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159 if ((signature[1] & 0xFF) !is 80) return false; //P |
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160 if ((signature[2] & 0xFF) !is 78) return false; //N |
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161 if ((signature[3] & 0xFF) !is 71) return false; //G |
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162 if ((signature[4] & 0xFF) !is 13) return false; //<RETURN> |
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163 if ((signature[5] & 0xFF) !is 10) return false; //<LINEFEED> |
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164 if ((signature[6] & 0xFF) !is 26) return false; //<CTRL/Z> |
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165 if ((signature[7] & 0xFF) !is 10) return false; //<LINEFEED> |
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166 return true; |
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167 } catch (Exception e) { |
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168 return false; |
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169 } |
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170 } |
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171 /** |
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172 * DWT does not support 16-bit depths. If this image uses |
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173 * 16-bit depths, convert the data to an 8-bit depth. |
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174 */ |
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175 byte[] validateBitDepth(byte[] data) { |
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176 if (headerChunk.getBitDepth() > 8) { |
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177 byte[] result = new byte[data.length / 2]; |
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178 compress16BitDepthTo8BitDepth(data, 0, result, 0, result.length); |
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179 return result; |
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180 } else { |
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181 return data; |
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182 } |
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183 } |
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184 /** |
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185 * DWT does not support greyscale as a color type. For |
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186 * plain grayscale, we create a palette. For Grayscale |
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187 * with Alpha, however, we need to convert the pixels |
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188 * to use RGB values. |
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189 * Note: This method assumes that the bit depth of the |
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190 * data has already been restricted to 8 or less. |
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191 */ |
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192 void setPixelData(byte[] data, ImageData imageData) { |
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193 switch (headerChunk.getColorType()) { |
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194 case PngIhdrChunk.COLOR_TYPE_GRAYSCALE_WITH_ALPHA: |
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195 { |
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196 int width = imageData.width; |
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197 int height = imageData.height; |
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198 int destBytesPerLine = imageData.bytesPerLine; |
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199 /* |
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200 * If the image uses 16-bit depth, it is converted |
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201 * to an 8-bit depth image. |
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202 */ |
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203 int srcBytesPerLine = getAlignedBytesPerRow(); |
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204 if (headerChunk.getBitDepth() > 8) srcBytesPerLine /= 2; |
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205 |
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206 byte[] rgbData = new byte[destBytesPerLine * height]; |
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207 byte[] alphaData = new byte[width * height]; |
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208 for (int y = 0; y < height; y++) { |
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209 int srcIndex = srcBytesPerLine * y; |
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210 int destIndex = destBytesPerLine * y; |
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211 int destAlphaIndex = width * y; |
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212 for (int x = 0; x < width; x++) { |
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213 byte grey = data[srcIndex]; |
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214 byte alpha = data[srcIndex + 1]; |
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215 rgbData[destIndex + 0] = grey; |
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216 rgbData[destIndex + 1] = grey; |
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217 rgbData[destIndex + 2] = grey; |
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218 alphaData[destAlphaIndex] = alpha; |
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219 srcIndex += 2; |
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220 destIndex += 3; |
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221 destAlphaIndex++; |
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222 } |
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223 } |
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224 imageData.data = rgbData; |
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225 imageData.alphaData = alphaData; |
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226 break; |
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227 } |
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228 case PngIhdrChunk.COLOR_TYPE_RGB_WITH_ALPHA: |
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229 { |
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230 int width = imageData.width; |
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231 int height = imageData.height; |
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232 int destBytesPerLine = imageData.bytesPerLine; |
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233 int srcBytesPerLine = getAlignedBytesPerRow(); |
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234 /* |
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235 * If the image uses 16-bit depth, it is converted |
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236 * to an 8-bit depth image. |
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237 */ |
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238 if (headerChunk.getBitDepth() > 8) srcBytesPerLine /= 2; |
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239 |
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240 byte[] rgbData = new byte[destBytesPerLine * height]; |
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241 byte[] alphaData = new byte[width * height]; |
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242 for (int y = 0; y < height; y++) { |
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243 int srcIndex = srcBytesPerLine * y; |
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244 int destIndex = destBytesPerLine * y; |
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245 int destAlphaIndex = width * y; |
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246 for (int x = 0; x < width; x++) { |
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247 rgbData[destIndex + 0] = data[srcIndex + 0]; |
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248 rgbData[destIndex + 1] = data[srcIndex + 1]; |
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249 rgbData[destIndex + 2] = data[srcIndex + 2]; |
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250 alphaData[destAlphaIndex] = data[srcIndex + 3]; |
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251 srcIndex += 4; |
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252 destIndex += 3; |
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253 destAlphaIndex++; |
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254 } |
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255 } |
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256 imageData.data = rgbData; |
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257 imageData.alphaData = alphaData; |
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258 break; |
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259 } |
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260 case PngIhdrChunk.COLOR_TYPE_RGB: |
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261 imageData.data = data; |
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262 break; |
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263 case PngIhdrChunk.COLOR_TYPE_PALETTE: |
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264 imageData.data = data; |
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265 if (alphaPalette !is null) { |
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266 int size = imageData.width * imageData.height; |
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267 byte[] alphaData = new byte[size]; |
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268 byte[] pixelData = new byte[size]; |
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269 imageData.getPixels(0, 0, size, pixelData, 0); |
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270 for (int i = 0; i < pixelData.length; i++) { |
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271 alphaData[i] = alphaPalette[pixelData[i] & 0xFF]; |
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272 } |
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273 imageData.alphaData = alphaData; |
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274 } |
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275 break; |
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276 default: |
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277 imageData.data = data; |
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278 break; |
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279 } |
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280 } |
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281 /** |
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282 * PNG supports some color types and bit depths that are |
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283 * unsupported by DWT. If the image uses an unsupported |
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284 * color type (either of the gray scale types) or bit |
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285 * depth (16), convert the data to an DWT-supported |
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286 * format. Then assign the data into the ImageData given. |
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287 */ |
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288 void setImageDataValues(byte[] data, ImageData imageData) { |
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289 byte[] result = validateBitDepth(data); |
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290 setPixelData(result, imageData); |
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291 } |
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292 /** |
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293 * Read the image data from the data stream. This must handle |
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294 * decoding the data, filtering, and interlacing. |
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295 */ |
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296 void readPixelData(PngIdatChunk chunk, PngChunkReader chunkReader) throws IOException { |
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297 InputStream stream = new PngInputStream(chunk, chunkReader); |
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298 //TEMPORARY CODE |
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299 bool use3_2 = System.getProperty("dwt.internal.image.PNGFileFormat_3.2") !is null; |
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300 InputStream inflaterStream = use3_2 ? null : Compatibility.newInflaterInputStream(stream); |
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301 if (inflaterStream !is null) { |
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302 stream = inflaterStream; |
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303 } else { |
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304 stream = new PngDecodingDataStream(stream); |
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305 } |
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306 int interlaceMethod = headerChunk.getInterlaceMethod(); |
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307 if (interlaceMethod is PngIhdrChunk.INTERLACE_METHOD_NONE) { |
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308 readNonInterlacedImage(stream); |
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309 } else { |
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310 readInterlacedImage(stream); |
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311 } |
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312 /* |
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313 * InflaterInputStream does not consume all bytes in the stream |
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314 * when it is closed. This may leave unread IDAT chunks. The fix |
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315 * is to read all available bytes before closing it. |
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316 */ |
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317 while (stream.available() > 0) stream.read(); |
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318 stream.close(); |
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319 } |
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320 /** |
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321 * Answer the number of bytes in a word-aligned row of pixel data. |
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322 */ |
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323 int getAlignedBytesPerRow() { |
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324 return ((getBytesPerRow(headerChunk.getWidth()) + 3) / 4) * 4; |
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325 } |
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326 /** |
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327 * Answer the number of bytes in each row of the image |
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328 * data. Each PNG row is byte-aligned, so images with bit |
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329 * depths less than a byte may have unused bits at the |
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330 * end of each row. The value of these bits is undefined. |
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331 */ |
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332 int getBytesPerRow() { |
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333 return getBytesPerRow(headerChunk.getWidth()); |
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334 } |
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335 /** |
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336 * Answer the number of bytes needed to represent a pixel. |
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337 * This value depends on the image's color type and bit |
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338 * depth. |
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339 * Note that this method rounds up if an image's pixel size |
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340 * isn't byte-aligned. |
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341 */ |
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342 int getBytesPerPixel() { |
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343 int bitsPerPixel = headerChunk.getBitsPerPixel(); |
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344 return (bitsPerPixel + 7) / 8; |
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345 } |
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346 /** |
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347 * Answer the number of bytes in a row of the given pixel |
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348 * width. Each row is byte-aligned, so images with bit |
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349 * depths less than a byte may have unused bits at the |
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350 * end of each row. The value of these bits is undefined. |
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351 */ |
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352 int getBytesPerRow(int rowWidthInPixels) { |
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353 int bitsPerPixel = headerChunk.getBitsPerPixel(); |
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354 int bitsPerRow = bitsPerPixel * rowWidthInPixels; |
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355 int bitsPerByte = 8; |
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356 return (bitsPerRow + (bitsPerByte - 1)) / bitsPerByte; |
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357 } |
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358 /** |
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359 * 1. Read one of the seven frames of interlaced data. |
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360 * 2. Update the imageData. |
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361 * 3. Notify the image loader's listeners of the frame load. |
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362 */ |
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363 void readInterlaceFrame( |
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364 InputStream inputStream, |
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365 int rowInterval, |
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366 int columnInterval, |
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367 int startRow, |
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368 int startColumn, |
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369 int frameCount) throws IOException |
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370 { |
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371 int width = headerChunk.getWidth(); |
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372 int alignedBytesPerRow = getAlignedBytesPerRow(); |
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373 int height = headerChunk.getHeight(); |
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374 if (startRow >= height || startColumn >= width) return; |
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375 |
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376 int pixelsPerRow = (width - startColumn + columnInterval - 1) / columnInterval; |
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377 int bytesPerRow = getBytesPerRow(pixelsPerRow); |
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378 byte[] row1 = new byte[bytesPerRow]; |
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379 byte[] row2 = new byte[bytesPerRow]; |
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380 byte[] currentRow = row1; |
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381 byte[] lastRow = row2; |
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382 for (int row = startRow; row < height; row += rowInterval) { |
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383 byte filterType = (byte)inputStream.read(); |
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384 int read = 0; |
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385 while (read !is bytesPerRow) { |
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386 read += inputStream.read(currentRow, read, bytesPerRow - read); |
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387 } |
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388 filterRow(currentRow, lastRow, filterType); |
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389 if (headerChunk.getBitDepth() >= 8) { |
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390 int bytesPerPixel = getBytesPerPixel(); |
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391 int dataOffset = (row * alignedBytesPerRow) + (startColumn * bytesPerPixel); |
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392 for (int rowOffset = 0; rowOffset < currentRow.length; rowOffset += bytesPerPixel) { |
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393 for (int byteOffset = 0; byteOffset < bytesPerPixel; byteOffset++) { |
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394 data[dataOffset + byteOffset] = currentRow[rowOffset + byteOffset]; |
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395 } |
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396 dataOffset += (columnInterval * bytesPerPixel); |
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397 } |
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398 } else { |
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399 int bitsPerPixel = headerChunk.getBitDepth(); |
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400 int pixelsPerByte = 8 / bitsPerPixel; |
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401 int column = startColumn; |
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402 int rowBase = row * alignedBytesPerRow; |
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403 int valueMask = 0; |
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404 for (int i = 0; i < bitsPerPixel; i++) { |
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405 valueMask <<= 1; |
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406 valueMask |= 1; |
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407 } |
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408 int maxShift = 8 - bitsPerPixel; |
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409 for (int byteOffset = 0; byteOffset < currentRow.length; byteOffset++) { |
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410 for (int bitOffset = maxShift; bitOffset >= 0; bitOffset -= bitsPerPixel) { |
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411 if (column < width) { |
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412 int dataOffset = rowBase + (column * bitsPerPixel / 8); |
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413 int value = (currentRow[byteOffset] >> bitOffset) & valueMask; |
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414 int dataShift = maxShift - (bitsPerPixel * (column % pixelsPerByte)); |
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415 data[dataOffset] |= value << dataShift; |
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416 } |
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417 column += columnInterval; |
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418 } |
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419 } |
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420 } |
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421 currentRow = (currentRow is row1) ? row2 : row1; |
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422 lastRow = (lastRow is row1) ? row2 : row1; |
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423 } |
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424 setImageDataValues(data, imageData); |
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425 fireInterlacedFrameEvent(frameCount); |
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426 } |
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427 /** |
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428 * Read the pixel data for an interlaced image from the |
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429 * data stream. |
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430 */ |
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431 void readInterlacedImage(InputStream inputStream) throws IOException { |
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432 readInterlaceFrame(inputStream, 8, 8, 0, 0, 0); |
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433 readInterlaceFrame(inputStream, 8, 8, 0, 4, 1); |
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434 readInterlaceFrame(inputStream, 8, 4, 4, 0, 2); |
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435 readInterlaceFrame(inputStream, 4, 4, 0, 2, 3); |
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436 readInterlaceFrame(inputStream, 4, 2, 2, 0, 4); |
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437 readInterlaceFrame(inputStream, 2, 2, 0, 1, 5); |
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438 readInterlaceFrame(inputStream, 2, 1, 1, 0, 6); |
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439 } |
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440 /** |
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441 * Fire an event to let listeners know that an interlaced |
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442 * frame has been loaded. |
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443 * finalFrame should be true if the image has finished |
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444 * loading, false if there are more frames to come. |
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445 */ |
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446 void fireInterlacedFrameEvent(int frameCount) { |
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447 if (loader.hasListeners()) { |
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448 ImageData image = (ImageData) imageData.clone(); |
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449 bool finalFrame = frameCount is 6; |
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450 loader.notifyListeners(new ImageLoaderEvent(loader, image, frameCount, finalFrame)); |
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451 } |
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452 } |
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453 /** |
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454 * Read the pixel data for a non-interlaced image from the |
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455 * data stream. |
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456 * Update the imageData to reflect the new data. |
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457 */ |
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458 void readNonInterlacedImage(InputStream inputStream) throws IOException { |
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459 int dataOffset = 0; |
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460 int alignedBytesPerRow = getAlignedBytesPerRow(); |
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461 int bytesPerRow = getBytesPerRow(); |
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462 byte[] row1 = new byte[bytesPerRow]; |
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463 byte[] row2 = new byte[bytesPerRow]; |
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464 byte[] currentRow = row1; |
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465 byte[] lastRow = row2; |
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466 int height = headerChunk.getHeight(); |
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467 for (int row = 0; row < height; row++) { |
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468 byte filterType = (byte)inputStream.read(); |
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469 int read = 0; |
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470 while (read !is bytesPerRow) { |
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471 read += inputStream.read(currentRow, read, bytesPerRow - read); |
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472 } |
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473 filterRow(currentRow, lastRow, filterType); |
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474 System.arraycopy(currentRow, 0, data, dataOffset, bytesPerRow); |
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475 dataOffset += alignedBytesPerRow; |
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476 currentRow = (currentRow is row1) ? row2 : row1; |
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477 lastRow = (lastRow is row1) ? row2 : row1; |
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478 } |
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479 setImageDataValues(data, imageData); |
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480 } |
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481 /** |
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482 * DWT does not support 16-bit depth color formats. |
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483 * Convert the 16-bit data to 8-bit data. |
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484 * The correct way to do this is to multiply each |
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485 * 16 bit value by the value: |
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486 * (2^8 - 1) / (2^16 - 1). |
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487 * The fast way to do this is just to drop the low |
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488 * byte of the 16-bit value. |
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489 */ |
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490 static void compress16BitDepthTo8BitDepth( |
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491 byte[] source, |
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492 int sourceOffset, |
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493 byte[] destination, |
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494 int destinationOffset, |
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495 int numberOfValues) |
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496 { |
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497 //double multiplier = (Compatibility.pow2(8) - 1) / (Compatibility.pow2(16) - 1); |
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498 for (int i = 0; i < numberOfValues; i++) { |
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499 int sourceIndex = sourceOffset + (2 * i); |
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500 int destinationIndex = destinationOffset + i; |
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501 //int value = (source[sourceIndex] << 8) | source[sourceIndex + 1]; |
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502 //byte compressedValue = (byte)(value * multiplier); |
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503 byte compressedValue = source[sourceIndex]; |
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504 destination[destinationIndex] = compressedValue; |
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505 } |
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506 } |
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507 /** |
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508 * DWT does not support 16-bit depth color formats. |
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509 * Convert the 16-bit data to 8-bit data. |
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510 * The correct way to do this is to multiply each |
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511 * 16 bit value by the value: |
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512 * (2^8 - 1) / (2^16 - 1). |
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513 * The fast way to do this is just to drop the low |
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514 * byte of the 16-bit value. |
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515 */ |
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516 static int compress16BitDepthTo8BitDepth(int value) { |
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517 //double multiplier = (Compatibility.pow2(8) - 1) / (Compatibility.pow2(16) - 1); |
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518 //byte compressedValue = (byte)(value * multiplier); |
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519 return value >> 8; |
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520 } |
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521 /** |
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522 * PNG supports four filtering types. These types are applied |
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523 * per row of image data. This method unfilters the given row |
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524 * based on the filterType. |
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525 */ |
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526 void filterRow(byte[] row, byte[] previousRow, int filterType) { |
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527 int byteOffset = headerChunk.getFilterByteOffset(); |
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528 switch (filterType) { |
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529 case PngIhdrChunk.FILTER_NONE: |
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530 break; |
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531 case PngIhdrChunk.FILTER_SUB: |
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532 for (int i = byteOffset; i < row.length; i++) { |
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533 int current = row[i] & 0xFF; |
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534 int left = row[i - byteOffset] & 0xFF; |
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535 row[i] = (byte)((current + left) & 0xFF); |
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536 } |
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537 break; |
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parents:
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538 case PngIhdrChunk.FILTER_UP: |
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539 for (int i = 0; i < row.length; i++) { |
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540 int current = row[i] & 0xFF; |
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541 int above = previousRow[i] & 0xFF; |
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542 row[i] = (byte)((current + above) & 0xFF); |
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543 } |
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544 break; |
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545 case PngIhdrChunk.FILTER_AVERAGE: |
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546 for (int i = 0; i < row.length; i++) { |
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547 int left = (i < byteOffset) ? 0 : row[i - byteOffset] & 0xFF; |
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548 int above = previousRow[i] & 0xFF; |
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549 int current = row[i] & 0xFF; |
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550 row[i] = (byte)((current + ((left + above) / 2)) & 0xFF); |
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551 } |
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552 break; |
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parents:
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changeset
|
553 case PngIhdrChunk.FILTER_PAETH: |
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parents:
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|
554 for (int i = 0; i < row.length; i++) { |
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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changeset
|
555 int left = (i < byteOffset) ? 0 : row[i - byteOffset] & 0xFF; |
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changeset
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556 int aboveLeft = (i < byteOffset) ? 0 : previousRow[i - byteOffset] & 0xFF; |
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changeset
|
557 int above = previousRow[i] & 0xFF; |
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|
558 |
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559 int a = Math.abs(above - aboveLeft); |
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|
560 int b = Math.abs(left - aboveLeft); |
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561 int c = Math.abs(left - aboveLeft + above - aboveLeft); |
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|
562 |
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|
563 int preductor = 0; |
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564 if (a <= b && a <= c) { |
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565 preductor = left; |
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566 } else if (b <= c) { |
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|
567 preductor = above; |
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568 } else { |
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|
569 preductor = aboveLeft; |
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|
570 } |
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|
571 |
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|
572 int currentValue = row[i] & 0xFF; |
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parents:
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573 row[i] = (byte) ((currentValue + preductor) & 0xFF); |
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parents:
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574 } |
380af2bdd8e5
Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff
changeset
|
575 break; |
380af2bdd8e5
Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff
changeset
|
576 } |
380af2bdd8e5
Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff
changeset
|
577 } |
380af2bdd8e5
Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff
changeset
|
578 |
380af2bdd8e5
Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff
changeset
|
579 } |