Mercurial > projects > dwt-linux
annotate dwt/internal/image/PngPlteChunk.d @ 240:ce446666f5a2
Update to SWT 3.4M7
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Mon, 12 May 2008 19:13:01 +0200 |
| parents | 380bad9f6852 |
| children | c0d810de7093 |
| rev | line source |
|---|---|
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1 /******************************************************************************* |
| 14 | 2 * Copyright (c) 2000, 2006 IBM Corporation and others. |
| 3 * All rights reserved. This program and the accompanying materials | |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 108 | 10 * Port to the D programming language: |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 14 | 12 *******************************************************************************/ |
| 13 module dwt.internal.image.PngPlteChunk; | |
| 14 | |
| 238 | 15 import dwt.dwthelper.utils; |
| 16 | |
| 14 | 17 |
| 71 | 18 import dwt.DWT; |
| 14 | 19 import dwt.graphics.PaletteData; |
| 20 import dwt.graphics.RGB; | |
| 21 import dwt.internal.image.PngChunk; | |
| 22 import dwt.internal.image.PngFileReadState; | |
| 23 import dwt.internal.image.PngIhdrChunk; | |
| 24 | |
| 25 import tango.text.convert.Format; | |
| 26 | |
| 27 class PngPlteChunk : PngChunk { | |
| 28 | |
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29 int paletteSize; |
| 14 | 30 |
| 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()); |
| 14 | 37 } |
| 38 | |
| 39 this(byte[] reference){ | |
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40 super(reference); |
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41 paletteSize = length / 3; |
| 14 | 42 } |
| 43 | |
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44 override int getChunkType() { |
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45 return CHUNK_PLTE; |
| 14 | 46 } |
| 47 | |
| 48 /** | |
| 49 * Get the number of colors in this palette. | |
| 50 */ | |
| 51 int getPaletteSize() { | |
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52 return paletteSize; |
| 14 | 53 } |
| 54 | |
| 55 /** | |
| 56 * Get a PaletteData object representing the colors | |
| 57 * stored in this PLTE chunk. | |
| 58 * The result should be cached as the PLTE chunk | |
| 59 * does not store the palette data created. | |
| 60 */ | |
| 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); |
| 14 | 73 } |
| 74 | |
| 75 /** | |
| 76 * Set the data of a PLTE chunk to the colors | |
| 77 * stored in the specified PaletteData object. | |
| 78 */ | |
| 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 } |
| 14 | 87 } |
| 88 | |
| 89 /** | |
| 90 * Answer whether the chunk is a valid PLTE chunk. | |
| 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 { |
| 71 | 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 } |
| 14 | 105 |
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106 super.validate(readState, headerChunk); |
| 14 | 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. |
| 71 | 111 // if (!headerChunk.getCanHavePalette()) DWT.error(DWT.ERROR_INVALID_IMAGE); |
| 14 | 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. |
| 240 | 115 if (getLength() % 3 !is 0) DWT.error(DWT.ERROR_INVALID_IMAGE); |
| 14 | 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) { |
| 71 | 121 DWT.error(DWT.ERROR_INVALID_IMAGE); |
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122 } |
| 14 | 123 |
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124 // Palettes cannot have more than 256 entries. |
| 71 | 125 if (256 < paletteSize) DWT.error(DWT.ERROR_INVALID_IMAGE); |
| 14 | 126 } |
| 127 | |
| 238 | 128 override String contributeToString() { |
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129 return Format("\n\tPalette size:{}", paletteSize ); |
| 14 | 130 } |
| 131 | |
| 132 } |