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view org.eclipse.swt.win32.win32.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> |
---|---|
date | Sat, 09 Jul 2011 15:50:20 +0300 |
parents | 6dd524f61e62 |
children |
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/******************************************************************************* * Copyright (c) 2000, 2008 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module org.eclipse.swt.internal.image.PngHuffmanTable; import org.eclipse.swt.internal.image.PngDecodingDataStream; public class PngHuffmanTable { CodeLengthInfo[] codeLengthInfo; int[] codeValues; static const int MAX_CODE_LENGTH = 15; static const int BAD_CODE = 0xFFFFFFF; static const int incs[] = [1391376, 463792, 198768, 86961, 33936, 13776, 4592, 1968, 861, 336, 112, 48, 21, 7, 3, 1]; this (int[] lengths) { initialize(lengths); generateTable(lengths); } private void initialize(in int[] lengths) { codeValues = new int[lengths.length]; for (int i = 0; i < codeValues.length; i++) { codeValues[i] = i; } // minCodesByLength[n] : The smallest Huffman code of length n + 1. // maxCodesByLength[n] : The largest Huffman code of length n + 1. // indexesByLength[n] : Index into the values array. First value with a code of length n + 1. codeLengthInfo = new CodeLengthInfo[MAX_CODE_LENGTH]; for (int i = 0; i < MAX_CODE_LENGTH; i++) { codeLengthInfo[i] = new CodeLengthInfo(); codeLengthInfo[i].length = i; codeLengthInfo[i].baseIndex = 0; codeLengthInfo[i].min = BAD_CODE; codeLengthInfo[i].max = -1; } } private void generateTable(int[] lengths) { // Sort the values using shellsort. Primary key is code size. Secondary key is value. int codeValuesTemp; for (int k = 0; k < 16; k++) { for (int h = incs[k], i = h; i < lengths.length; i++) { int v = lengths[i]; codeValuesTemp = codeValues[i]; int j = i; while (j >= h && (lengths[j - h] > v || (lengths[j - h] is v && codeValues[j - h] > codeValuesTemp))) { lengths[j] = lengths[j - h]; codeValues[j] = codeValues[j - h]; j -= h; } lengths[j] = v; codeValues[j] = codeValuesTemp; } } // These values in these arrays correspond to the elements of the // "values" array. The Huffman code for codeValues[N] is codes[N] // and the length of the code is lengths[N]. int[] codes = new int[lengths.length]; int lastLength = 0; int code = 0; for (int i = 0; i < lengths.length; i++) { while (lastLength !is lengths[i]) { lastLength++; code <<= 1; } if (lastLength !is 0) { codes[i] = code; code++; } } int last = 0; for (int i = 0; i < lengths.length; i++) { if (last !is lengths[i]) { last = lengths[i]; codeLengthInfo[last - 1].baseIndex = i; codeLengthInfo[last - 1].min = codes[i]; } if (last !is 0) codeLengthInfo[last - 1].max = codes[i]; } } int getNextValue(PngDecodingDataStream stream) { int code = stream.getNextIdatBit(); int codelength = 0; // Here we are taking advantage of the fact that 1 bits are used as // a prefix to the longer codeValues. while (codelength < MAX_CODE_LENGTH && code > codeLengthInfo[codelength].max) { code = ((code << 1) | stream.getNextIdatBit()); codelength++; } if (codelength >= MAX_CODE_LENGTH) stream.error(); // Now we have a Huffman code of length (codelength + 1) that // is somewhere in the range // minCodesByLength[codelength]..maxCodesByLength[codelength]. // This code is the (offset + 1)'th code of (codelength + 1); int offset = code - codeLengthInfo[codelength].min; // indexesByLength[codelength] is the first code of length (codelength + 1) // so now we can look up the value for the Huffman code in the table. int index = codeLengthInfo[codelength].baseIndex + offset; return codeValues[index]; } static class CodeLengthInfo { int length; int max; int min; int baseIndex; } }