Mercurial > projects > dwt-win
annotate dwt/internal/image/PngPlteChunk.d @ 341:f403c83322c3 default tip
fix: thx torhu
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 08 Nov 2009 20:58:32 +0100 |
parents | 0e2b4fed7a0f |
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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.PngPlteChunk; |
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14 |
213 | 15 import dwt.dwthelper.utils; |
16 | |
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17 |
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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.PngChunk; |
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22 import dwt.internal.image.PngFileReadState; |
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23 import dwt.internal.image.PngIhdrChunk; |
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24 |
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25 import tango.text.convert.Format; |
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26 |
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27 class PngPlteChunk : PngChunk { |
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28 |
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29 int paletteSize; |
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30 |
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31 this(PaletteData palette) { |
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32 super(palette.getRGBs().length * 3); |
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33 paletteSize = length / 3; |
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34 setType(TYPE_PLTE); |
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35 setPaletteData(palette); |
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36 setCRC(computeCRC()); |
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37 } |
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38 |
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39 this(byte[] reference){ |
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40 super(reference); |
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41 paletteSize = length / 3; |
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42 } |
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43 |
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44 override int getChunkType() { |
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45 return CHUNK_PLTE; |
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46 } |
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47 |
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48 /** |
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49 * Get the number of colors in this palette. |
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50 */ |
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51 int getPaletteSize() { |
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52 return paletteSize; |
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53 } |
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54 |
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55 /** |
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56 * Get a PaletteData object representing the colors |
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57 * stored in this PLTE chunk. |
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58 * The result should be cached as the PLTE chunk |
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59 * does not store the palette data created. |
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60 */ |
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61 PaletteData getPaletteData() { |
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62 RGB[] rgbs = new RGB[paletteSize]; |
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63 // int start = DATA_OFFSET; |
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64 // int end = DATA_OFFSET + length; |
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65 for (int i = 0; i < rgbs.length; i++) { |
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66 int offset = DATA_OFFSET + (i * 3); |
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67 int red = reference[offset] & 0xFF; |
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68 int green = reference[offset + 1] & 0xFF; |
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69 int blue = reference[offset + 2] & 0xFF; |
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70 rgbs[i] = new RGB(red, green, blue); |
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71 } |
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72 return new PaletteData(rgbs); |
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73 } |
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74 |
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75 /** |
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76 * Set the data of a PLTE chunk to the colors |
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77 * stored in the specified PaletteData object. |
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78 */ |
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79 void setPaletteData(PaletteData palette) { |
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80 RGB[] rgbs = palette.getRGBs(); |
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81 for (int i = 0; i < rgbs.length; i++) { |
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82 int offset = DATA_OFFSET + (i * 3); |
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83 reference[offset] = cast(byte) rgbs[i].red; |
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84 reference[offset + 1] = cast(byte) rgbs[i].green; |
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85 reference[offset + 2] = cast(byte) rgbs[i].blue; |
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86 } |
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87 } |
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88 |
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89 /** |
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90 * Answer whether the chunk is a valid PLTE chunk. |
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91 */ |
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92 override void validate(PngFileReadState readState, PngIhdrChunk headerChunk) { |
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93 // A PLTE chunk is invalid if no IHDR has been read or if any PLTE, |
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94 // IDAT, or IEND chunk has been read. |
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95 if (!readState.readIHDR |
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96 || readState.readPLTE |
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97 || readState.readTRNS |
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98 || readState.readIDAT |
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99 || readState.readIEND) |
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100 { |
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101 DWT.error(DWT.ERROR_INVALID_IMAGE); |
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102 } else { |
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103 readState.readPLTE = true; |
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104 } |
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105 |
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106 super.validate(readState, headerChunk); |
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107 |
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108 // Palettes cannot be included in grayscale images. |
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109 // |
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110 // Note: just ignore the palette. |
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111 // if (!headerChunk.getCanHavePalette()) DWT.error(DWT.ERROR_INVALID_IMAGE); |
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112 |
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113 // Palette chunks' data fields must be event multiples |
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114 // of 3. Each 3-byte group represents an RGB value. |
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115 if (getLength() % 3 !is 0) DWT.error(DWT.ERROR_INVALID_IMAGE); |
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116 |
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117 // Palettes cannot have more entries than 2^bitDepth |
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118 // where bitDepth is the bit depth of the image given |
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119 // in the IHDR chunk. |
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120 if (1 << headerChunk.getBitDepth() < paletteSize) { |
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121 DWT.error(DWT.ERROR_INVALID_IMAGE); |
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122 } |
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123 |
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124 // Palettes cannot have more than 256 entries. |
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125 if (256 < paletteSize) DWT.error(DWT.ERROR_INVALID_IMAGE); |
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126 } |
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127 |
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128 override String contributeToString() { |
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129 return Format("\n\tPalette size:{}", paletteSize ); |
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130 } |
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131 |
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132 } |