Mercurial > projects > dwt2
annotate org.eclipse.swt.gtk.linux.x86/src/org/eclipse/swt/internal/image/PngHuffmanTable.d @ 120:536e43f63c81
Comprehensive update for Win32/Linux32 dmd-2.053/dmd-1.068+Tango-r5661
===D2===
* added [Try]Immutable/Const/Shared templates to work with differenses in D1/D2 instead of version statements
used these templates to work with strict type storage rules of dmd-2.053
* com.ibm.icu now also compilable with D2, but not tested yet
* small fixes
Snippet288 - shared data is in TLS
===Phobos===
* fixed critical bugs in Phobos implemention
completely incorrect segfault prone fromStringz (Linux's port ruthless killer)
terrible, incorrect StringBuffer realization (StyledText killer)
* fixed small bugs as well
Snippet72 - misprint in the snippet
* implemented missed functionality for Phobos
ByteArrayOutputStream implemented (image loading available)
formatting correctly works for all DWT's cases
As a result, folowing snippets now works with Phobos (Snippet### - what is fixed):
Snippet24, 42, 111, 115, 130, 235, 276 - bad string formatting
Snippet48, 282 - crash on image loading
Snippet163, 189, 211, 213, 217, 218, 222 - crash on copy/cut in StyledText
Snippet244 - hang-up
===Tango===
* few changes for the latest Tango trunc-r5661
* few small performance improvments
===General===
* implMissing-s for only one version changed to implMissingInTango/InPhobos
* incorrect calls to Format in toString-s fixed
* fixed loading \uXXXX characters in ResourceBundle
* added good UTF-8 support for StyledText, TextLayout (Win32) and friends
UTF functions revised and tested. It is now in java.nonstandard.*Utf modules
StyledText and TextLayout (Win32) modules revised for UTF-8 support
* removed small diferences in most identical files in *.swt.* folders
*.swt.internal.image, *.swt.events and *.swt.custom are identical in Win32/Linux32
now 179 of 576 (~31%) files in *.swt.* folders are fully identical
* Win32: snippets now have right subsystem, pretty icons and native system style controls
* small fixes in snippets
Snippet44 - it's not Snippet44
Snippet212 - functions work with different images and offsets arrays
Win32: Snippet282 - crash on close if the button has an image
Snippet293 - setGrayed is commented
and others
Win32: As a result, folowing snippets now works
Snippet68 - color doesn't change
Snippet163, 189, 211, 213, 217, 218, 222 - UTF-8 issues (see above)
Snippet193 - no tabel headers
author | Denis Shelomovskij <verylonglogin.reg@gmail.com> |
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date | Sat, 09 Jul 2011 15:50:20 +0300 |
parents | f713da8bc051 |
children |
rev | line source |
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25 | 1 /******************************************************************************* |
2 * Copyright (c) 2000, 2008 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 | |
10 * Port to the D programming language: | |
11 * Frank Benoit <benoit@tionex.de> | |
12 *******************************************************************************/ | |
13 module org.eclipse.swt.internal.image.PngHuffmanTable; | |
14 | |
15 import org.eclipse.swt.internal.image.PngDecodingDataStream; | |
16 | |
17 public class PngHuffmanTable { | |
18 CodeLengthInfo[] codeLengthInfo; | |
19 int[] codeValues; | |
20 | |
21 static const int MAX_CODE_LENGTH = 15; | |
22 static const int BAD_CODE = 0xFFFFFFF; | |
23 static const int incs[] = [1391376, 463792, 198768, 86961, 33936, 13776, 4592, 1968, 861, 336, 112, 48, 21, 7, 3, 1]; | |
24 | |
25 this (int[] lengths) { | |
26 initialize(lengths); | |
27 generateTable(lengths); | |
28 } | |
29 | |
120
536e43f63c81
Comprehensive update for Win32/Linux32 dmd-2.053/dmd-1.068+Tango-r5661
Denis Shelomovskij <verylonglogin.reg@gmail.com>
parents:
25
diff
changeset
|
30 private void initialize(in int[] lengths) { |
25 | 31 codeValues = new int[lengths.length]; |
32 for (int i = 0; i < codeValues.length; i++) { | |
33 codeValues[i] = i; | |
34 } | |
35 | |
36 // minCodesByLength[n] : The smallest Huffman code of length n + 1. | |
37 // maxCodesByLength[n] : The largest Huffman code of length n + 1. | |
38 // indexesByLength[n] : Index into the values array. First value with a code of length n + 1. | |
39 codeLengthInfo = new CodeLengthInfo[MAX_CODE_LENGTH]; | |
40 for (int i = 0; i < MAX_CODE_LENGTH; i++) { | |
41 codeLengthInfo[i] = new CodeLengthInfo(); | |
42 codeLengthInfo[i].length = i; | |
43 codeLengthInfo[i].baseIndex = 0; | |
44 codeLengthInfo[i].min = BAD_CODE; | |
45 codeLengthInfo[i].max = -1; | |
46 } | |
47 } | |
48 | |
49 private void generateTable(int[] lengths) { | |
50 // Sort the values using shellsort. Primary key is code size. Secondary key is value. | |
51 int codeValuesTemp; | |
52 for (int k = 0; k < 16; k++) { | |
53 for (int h = incs[k], i = h; i < lengths.length; i++) { | |
54 int v = lengths[i]; | |
55 codeValuesTemp = codeValues[i]; | |
56 int j = i; | |
57 while (j >= h && (lengths[j - h] > v || (lengths[j - h] is v && codeValues[j - h] > codeValuesTemp))) { | |
58 lengths[j] = lengths[j - h]; | |
59 codeValues[j] = codeValues[j - h]; | |
60 j -= h; | |
61 } | |
62 lengths[j] = v; | |
63 codeValues[j] = codeValuesTemp; | |
64 } | |
65 } | |
66 | |
67 // These values in these arrays correspond to the elements of the | |
68 // "values" array. The Huffman code for codeValues[N] is codes[N] | |
69 // and the length of the code is lengths[N]. | |
70 int[] codes = new int[lengths.length]; | |
71 int lastLength = 0; | |
72 int code = 0; | |
73 for (int i = 0; i < lengths.length; i++) { | |
74 while (lastLength !is lengths[i]) { | |
75 lastLength++; | |
76 code <<= 1; | |
77 } | |
78 if (lastLength !is 0) { | |
79 codes[i] = code; | |
80 code++; | |
81 } | |
82 } | |
83 | |
84 int last = 0; | |
85 for (int i = 0; i < lengths.length; i++) { | |
86 if (last !is lengths[i]) { | |
87 last = lengths[i]; | |
88 codeLengthInfo[last - 1].baseIndex = i; | |
89 codeLengthInfo[last - 1].min = codes[i]; | |
90 } | |
91 if (last !is 0) codeLengthInfo[last - 1].max = codes[i]; | |
92 } | |
93 } | |
94 | |
95 int getNextValue(PngDecodingDataStream stream) { | |
96 int code = stream.getNextIdatBit(); | |
97 int codelength = 0; | |
98 | |
99 // Here we are taking advantage of the fact that 1 bits are used as | |
100 // a prefix to the longer codeValues. | |
101 while (codelength < MAX_CODE_LENGTH && code > codeLengthInfo[codelength].max) { | |
102 code = ((code << 1) | stream.getNextIdatBit()); | |
103 codelength++; | |
104 } | |
105 if (codelength >= MAX_CODE_LENGTH) stream.error(); | |
106 | |
107 // Now we have a Huffman code of length (codelength + 1) that | |
108 // is somewhere in the range | |
109 // minCodesByLength[codelength]..maxCodesByLength[codelength]. | |
110 // This code is the (offset + 1)'th code of (codelength + 1); | |
111 int offset = code - codeLengthInfo[codelength].min; | |
112 | |
113 // indexesByLength[codelength] is the first code of length (codelength + 1) | |
114 // so now we can look up the value for the Huffman code in the table. | |
115 int index = codeLengthInfo[codelength].baseIndex + offset; | |
116 return codeValues[index]; | |
117 } | |
118 | |
119 static class CodeLengthInfo { | |
120 int length; | |
121 int max; | |
122 int min; | |
123 int baseIndex; | |
124 } | |
125 | |
126 } |