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annotate dwt/internal/image/PngPlteChunk.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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children 1a8b3cb347e0
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 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 dwt.DWT;
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15 import dwt.graphics.PaletteData;
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16 import dwt.graphics.RGB;
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17
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18 class PngPlteChunk : PngChunk {
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19
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20 int paletteSize;
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21
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22 PngPlteChunk(PaletteData palette) {
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23 super(palette.getRGBs().length * 3);
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24 paletteSize = length / 3;
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25 setType(TYPE_PLTE);
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26 setPaletteData(palette);
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27 setCRC(computeCRC());
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28 }
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29
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30 PngPlteChunk(byte[] reference){
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31 super(reference);
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32 paletteSize = length / 3;
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33 }
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34
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35 int getChunkType() {
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36 return CHUNK_PLTE;
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37 }
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38
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39 /**
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40 * Get the number of colors in this palette.
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41 */
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42 int getPaletteSize() {
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43 return paletteSize;
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44 }
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45
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46 /**
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47 * Get a PaletteData object representing the colors
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48 * stored in this PLTE chunk.
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49 * The result should be cached as the PLTE chunk
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50 * does not store the palette data created.
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51 */
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52 PaletteData getPaletteData() {
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53 RGB[] rgbs = new RGB[paletteSize];
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54 // int start = DATA_OFFSET;
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55 // int end = DATA_OFFSET + length;
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56 for (int i = 0; i < rgbs.length; i++) {
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57 int offset = DATA_OFFSET + (i * 3);
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58 int red = reference[offset] & 0xFF;
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59 int green = reference[offset + 1] & 0xFF;
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60 int blue = reference[offset + 2] & 0xFF;
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61 rgbs[i] = new RGB(red, green, blue);
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62 }
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63 return new PaletteData(rgbs);
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64 }
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65
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66 /**
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67 * Set the data of a PLTE chunk to the colors
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68 * stored in the specified PaletteData object.
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69 */
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70 void setPaletteData(PaletteData palette) {
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71 RGB[] rgbs = palette.getRGBs();
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72 for (int i = 0; i < rgbs.length; i++) {
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73 int offset = DATA_OFFSET + (i * 3);
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74 reference[offset] = (byte) rgbs[i].red;
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75 reference[offset + 1] = (byte) rgbs[i].green;
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76 reference[offset + 2] = (byte) rgbs[i].blue;
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77 }
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78 }
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79
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80 /**
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81 * Answer whether the chunk is a valid PLTE chunk.
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82 */
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83 void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
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84 // A PLTE chunk is invalid if no IHDR has been read or if any PLTE,
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85 // IDAT, or IEND chunk has been read.
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86 if (!readState.readIHDR
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87 || readState.readPLTE
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88 || readState.readTRNS
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89 || readState.readIDAT
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90 || readState.readIEND)
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91 {
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92 DWT.error(DWT.ERROR_INVALID_IMAGE);
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93 } else {
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94 readState.readPLTE = true;
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95 }
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96
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97 super.validate(readState, headerChunk);
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98
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99 // Palettes cannot be included in grayscale images.
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100 //
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101 // Note: just ignore the palette.
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102 // if (!headerChunk.getCanHavePalette()) DWT.error(DWT.ERROR_INVALID_IMAGE);
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103
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104 // Palette chunks' data fields must be event multiples
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105 // of 3. Each 3-byte group represents an RGB value.
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106 if (getLength() % 3 !is 0) DWT.error(DWT.ERROR_INVALID_IMAGE);
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107
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108 // Palettes cannot have more entries than 2^bitDepth
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109 // where bitDepth is the bit depth of the image given
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110 // in the IHDR chunk.
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111 if (1 << headerChunk.getBitDepth() < paletteSize) {
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112 DWT.error(DWT.ERROR_INVALID_IMAGE);
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113 }
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114
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115 // Palettes cannot have more than 256 entries.
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116 if (256 < paletteSize) DWT.error(DWT.ERROR_INVALID_IMAGE);
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117 }
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118
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119 void contributeToString(StringBuffer buffer) {
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120 buffer.append("\n\tPalette size:");
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121 buffer.append(paletteSize);
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122 }
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123
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124 }