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671 lines
22 KiB
C
671 lines
22 KiB
C
/*
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* GDI BiDirectional handling
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*
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* Copyright 2003 Shachar Shemesh
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* Copyright 2007 Maarten Lankhorst
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* Copyright 2010 CodeWeavers, Aric Stewart
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*
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*
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* Code derived from the modified reference implementation
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* that was found in revision 17 of http://unicode.org/reports/tr9/
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* "Unicode Standard Annex #9: THE BIDIRECTIONAL ALGORITHM"
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*
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* -- Copyright (C) 1999-2005, ASMUS, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of the Unicode data files and any associated documentation (the
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* "Data Files") or Unicode software and any associated documentation (the
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* "Software") to deal in the Data Files or Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, and/or sell copies of the Data Files or Software,
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* and to permit persons to whom the Data Files or Software are furnished
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* to do so, provided that (a) the above copyright notice(s) and this
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* permission notice appear with all copies of the Data Files or Software,
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* (b) both the above copyright notice(s) and this permission notice appear
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* in associated documentation, and (c) there is clear notice in each
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* modified Data File or in the Software as well as in the documentation
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* associated with the Data File(s) or Software that the data or software
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* has been modified.
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*/
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#include "ros_lpk.h"
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WINE_DEFAULT_DEBUG_CHANNEL(bidi);
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/* HELPER FUNCTIONS AND DECLARATIONS */
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#define odd(x) ((x) & 1)
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extern const unsigned short bidi_direction_table[] DECLSPEC_HIDDEN;
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/*------------------------------------------------------------------------
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Bidirectional Character Types
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as defined by the Unicode Bidirectional Algorithm Table 3-7.
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Note:
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The list of bidirectional character types here is not grouped the
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same way as the table 3-7, since the numberic values for the types
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are chosen to keep the state and action tables compact.
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------------------------------------------------------------------------*/
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enum directions
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{
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/* input types */
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/* ON MUST be zero, code relies on ON = N = 0 */
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ON = 0, /* Other Neutral */
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L, /* Left Letter */
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R, /* Right Letter */
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AN, /* Arabic Number */
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EN, /* European Number */
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AL, /* Arabic Letter (Right-to-left) */
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NSM, /* Non-spacing Mark */
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CS, /* Common Separator */
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ES, /* European Separator */
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ET, /* European Terminator (post/prefix e.g. $ and %) */
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/* resolved types */
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BN, /* Boundary neutral (type of RLE etc after explicit levels) */
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/* input types, */
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S, /* Segment Separator (TAB) // used only in L1 */
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WS, /* White space // used only in L1 */
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B, /* Paragraph Separator (aka as PS) */
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/* types for explicit controls */
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RLO, /* these are used only in X1-X9 */
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RLE,
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LRO,
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LRE,
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PDF,
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LRI, /* Isolate formatting characters new with 6.3 */
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RLI,
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FSI,
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PDI,
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/* resolved types, also resolved directions */
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NI = ON, /* alias, where ON, WS and S are treated the same */
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};
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/* HELPER FUNCTIONS */
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static inline unsigned short get_table_entry(const unsigned short *table, WCHAR ch)
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{
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return table[table[table[ch >> 8] + ((ch >> 4) & 0x0f)] + (ch & 0xf)];
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}
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/* Convert the libwine information to the direction enum */
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static void classify(LPCWSTR lpString, WORD *chartype, DWORD uCount)
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{
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unsigned i;
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for (i = 0; i < uCount; ++i)
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chartype[i] = get_table_entry( bidi_direction_table, lpString[i] );
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}
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/* Set a run of cval values at locations all prior to, but not including */
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/* iStart, to the new value nval. */
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static void SetDeferredRun(BYTE *pval, int cval, int iStart, int nval)
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{
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int i = iStart - 1;
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for (; i >= iStart - cval; i--)
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{
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pval[i] = nval;
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}
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}
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/* THE PARAGRAPH LEVEL */
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/*------------------------------------------------------------------------
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Function: resolveParagraphs
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Resolves the input strings into blocks over which the algorithm
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is then applied.
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Implements Rule P1 of the Unicode Bidi Algorithm
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Input: Text string
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Character count
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Output: revised character count
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Note: This is a very simplistic function. In effect it restricts
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the action of the algorithm to the first paragraph in the input
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where a paragraph ends at the end of the first block separator
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or at the end of the input text.
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------------------------------------------------------------------------*/
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static int resolveParagraphs(WORD *types, int cch)
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{
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/* skip characters not of type B */
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int ich = 0;
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for(; ich < cch && types[ich] != B; ich++);
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/* stop after first B, make it a BN for use in the next steps */
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if (ich < cch && types[ich] == B)
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types[ich++] = BN;
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return ich;
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}
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/* REORDER */
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/*------------------------------------------------------------------------
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Function: resolveLines
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Breaks a paragraph into lines
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Input: Array of line break flags
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Character count
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In/Out: Array of characters
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Returns the count of characters on the first line
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Note: This function only breaks lines at hard line breaks. Other
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line breaks can be passed in. If pbrk[n] is TRUE, then a break
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occurs after the character in pszInput[n]. Breaks before the first
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character are not allowed.
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------------------------------------------------------------------------*/
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static int resolveLines(LPCWSTR pszInput, const BOOL * pbrk, int cch)
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{
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/* skip characters not of type LS */
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int ich = 0;
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for(; ich < cch; ich++)
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{
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if (pszInput[ich] == (WCHAR)'\n' || (pbrk && pbrk[ich]))
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{
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ich++;
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break;
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}
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}
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return ich;
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}
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/*------------------------------------------------------------------------
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Function: resolveWhiteSpace
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Resolves levels for WS and S
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Implements rule L1 of the Unicode bidi Algorithm.
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Input: Base embedding level
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Character count
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Array of direction classes (for one line of text)
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In/Out: Array of embedding levels (for one line of text)
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Note: this should be applied a line at a time. The default driver
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code supplied in this file assumes a single line of text; for
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a real implementation, cch and the initial pointer values
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would have to be adjusted.
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------------------------------------------------------------------------*/
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static void resolveWhitespace(int baselevel, const WORD *pcls, BYTE *plevel, int cch)
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{
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int cchrun = 0;
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BYTE oldlevel = baselevel;
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int ich = 0;
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for (; ich < cch; ich++)
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{
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switch(pcls[ich])
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{
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default:
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cchrun = 0; /* any other character breaks the run */
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break;
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case WS:
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cchrun++;
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break;
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case RLE:
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case LRE:
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case LRO:
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case RLO:
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case PDF:
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case LRI:
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case RLI:
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case FSI:
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case PDI:
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case BN:
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plevel[ich] = oldlevel;
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cchrun++;
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break;
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case S:
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case B:
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/* reset levels for WS before eot */
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SetDeferredRun(plevel, cchrun, ich, baselevel);
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cchrun = 0;
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plevel[ich] = baselevel;
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break;
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}
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oldlevel = plevel[ich];
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}
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/* reset level before eot */
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SetDeferredRun(plevel, cchrun, ich, baselevel);
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}
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/*------------------------------------------------------------------------
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Function: BidiLines
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Implements the Line-by-Line phases of the Unicode Bidi Algorithm
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Input: Count of characters
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Array of character directions
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Inp/Out: Input text
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Array of levels
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------------------------------------------------------------------------*/
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static void BidiLines(int baselevel, LPWSTR pszOutLine, LPCWSTR pszLine, const WORD * pclsLine,
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BYTE * plevelLine, int cchPara, const BOOL * pbrk)
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{
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int cchLine = 0;
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int done = 0;
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int *run;
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run = HeapAlloc(GetProcessHeap(), 0, cchPara * sizeof(int));
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if (!run)
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{
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WARN("Out of memory\n");
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return;
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}
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do
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{
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/* break lines at LS */
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cchLine = resolveLines(pszLine, pbrk, cchPara);
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/* resolve whitespace */
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resolveWhitespace(baselevel, pclsLine, plevelLine, cchLine);
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if (pszOutLine)
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{
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int i;
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/* reorder each line in place */
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ScriptLayout(cchLine, plevelLine, NULL, run);
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for (i = 0; i < cchLine; i++)
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pszOutLine[done+run[i]] = pszLine[i];
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}
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pszLine += cchLine;
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plevelLine += cchLine;
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pbrk += pbrk ? cchLine : 0;
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pclsLine += cchLine;
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cchPara -= cchLine;
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done += cchLine;
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} while (cchPara);
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HeapFree(GetProcessHeap(), 0, run);
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}
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/*************************************************************
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* BIDI_Reorder
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*
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* Returns TRUE if reordering was required and done.
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*/
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BOOL BIDI_Reorder(
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HDC hDC, /*[in] Display DC */
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LPCWSTR lpString, /* [in] The string for which information is to be returned */
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INT uCount, /* [in] Number of WCHARs in string. */
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DWORD dwFlags, /* [in] GetCharacterPlacement compatible flags specifying how to process the string */
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DWORD dwWineGCP_Flags, /* [in] Wine internal flags - Force paragraph direction */
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LPWSTR lpOutString, /* [out] Reordered string */
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INT uCountOut, /* [in] Size of output buffer */
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UINT *lpOrder, /* [out] Logical -> Visual order map */
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WORD **lpGlyphs, /* [out] reordered, mirrored, shaped glyphs to display */
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INT *cGlyphs /* [out] number of glyphs generated */
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)
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{
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WORD *chartype;
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BYTE *levels;
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INT i, done;
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unsigned glyph_i;
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BOOL is_complex;
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int maxItems;
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int nItems;
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SCRIPT_CONTROL Control;
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SCRIPT_STATE State;
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SCRIPT_ITEM *pItems;
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HRESULT res;
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SCRIPT_CACHE psc = NULL;
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WORD *run_glyphs = NULL;
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WORD *pwLogClust = NULL;
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SCRIPT_VISATTR *psva = NULL;
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DWORD cMaxGlyphs = 0;
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BOOL doGlyphs = TRUE;
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TRACE("%s, %d, 0x%08x lpOutString=%p, lpOrder=%p\n",
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debugstr_wn(lpString, uCount), uCount, dwFlags,
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lpOutString, lpOrder);
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memset(&Control, 0, sizeof(Control));
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memset(&State, 0, sizeof(State));
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if (lpGlyphs)
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*lpGlyphs = NULL;
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if (!(dwFlags & GCP_REORDER))
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{
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FIXME("Asked to reorder without reorder flag set\n");
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return FALSE;
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}
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if (lpOutString && uCountOut < uCount)
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{
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FIXME("lpOutString too small\n");
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return FALSE;
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}
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chartype = HeapAlloc(GetProcessHeap(), 0, uCount * sizeof(WORD));
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if (!chartype)
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{
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WARN("Out of memory\n");
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return FALSE;
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}
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if (lpOutString)
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memcpy(lpOutString, lpString, uCount * sizeof(WCHAR));
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is_complex = FALSE;
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for (i = 0; i < uCount && !is_complex; i++)
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{
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if ((lpString[i] >= 0x900 && lpString[i] <= 0xfff) ||
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(lpString[i] >= 0x1cd0 && lpString[i] <= 0x1cff) ||
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(lpString[i] >= 0xa840 && lpString[i] <= 0xa8ff))
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is_complex = TRUE;
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}
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/* Verify reordering will be required */
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if ((WINE_GCPW_FORCE_RTL == (dwWineGCP_Flags&WINE_GCPW_DIR_MASK)) ||
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((dwWineGCP_Flags&WINE_GCPW_DIR_MASK) == WINE_GCPW_LOOSE_RTL))
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State.uBidiLevel = 1;
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else if (!is_complex)
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{
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done = 1;
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classify(lpString, chartype, uCount);
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for (i = 0; i < uCount; i++)
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switch (chartype[i])
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{
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case R:
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case AL:
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case RLE:
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case RLO:
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done = 0;
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break;
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}
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if (done)
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{
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HeapFree(GetProcessHeap(), 0, chartype);
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if (lpOrder)
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{
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for (i = 0; i < uCount; i++)
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lpOrder[i] = i;
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}
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return TRUE;
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}
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}
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levels = HeapAlloc(GetProcessHeap(), 0, uCount * sizeof(BYTE));
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if (!levels)
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{
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WARN("Out of memory\n");
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HeapFree(GetProcessHeap(), 0, chartype);
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return FALSE;
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}
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maxItems = 5;
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pItems = HeapAlloc(GetProcessHeap(),0, maxItems * sizeof(SCRIPT_ITEM));
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if (!pItems)
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{
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WARN("Out of memory\n");
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HeapFree(GetProcessHeap(), 0, chartype);
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HeapFree(GetProcessHeap(), 0, levels);
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return FALSE;
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}
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if (lpGlyphs)
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{
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#ifdef __REACTOS__
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/* ReactOS r57677 and r57679 */
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cMaxGlyphs = 3 * uCount / 2 + 16;
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#else
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cMaxGlyphs = 1.5 * uCount + 16;
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#endif
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run_glyphs = HeapAlloc(GetProcessHeap(),0,sizeof(WORD) * cMaxGlyphs);
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if (!run_glyphs)
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{
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WARN("Out of memory\n");
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HeapFree(GetProcessHeap(), 0, chartype);
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HeapFree(GetProcessHeap(), 0, levels);
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HeapFree(GetProcessHeap(), 0, pItems);
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return FALSE;
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}
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pwLogClust = HeapAlloc(GetProcessHeap(),0,sizeof(WORD) * uCount);
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if (!pwLogClust)
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{
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WARN("Out of memory\n");
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HeapFree(GetProcessHeap(), 0, chartype);
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HeapFree(GetProcessHeap(), 0, levels);
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HeapFree(GetProcessHeap(), 0, pItems);
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HeapFree(GetProcessHeap(), 0, run_glyphs);
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return FALSE;
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}
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psva = HeapAlloc(GetProcessHeap(),0,sizeof(SCRIPT_VISATTR) * uCount);
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if (!psva)
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{
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WARN("Out of memory\n");
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HeapFree(GetProcessHeap(), 0, chartype);
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HeapFree(GetProcessHeap(), 0, levels);
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HeapFree(GetProcessHeap(), 0, pItems);
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HeapFree(GetProcessHeap(), 0, run_glyphs);
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HeapFree(GetProcessHeap(), 0, pwLogClust);
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return FALSE;
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}
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}
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done = 0;
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glyph_i = 0;
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while (done < uCount)
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{
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INT j;
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classify(lpString + done, chartype, uCount - done);
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/* limit text to first block */
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i = resolveParagraphs(chartype, uCount - done);
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for (j = 0; j < i; ++j)
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switch(chartype[j])
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{
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case B:
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case S:
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case WS:
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case ON: chartype[j] = NI;
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default: continue;
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}
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if ((dwWineGCP_Flags&WINE_GCPW_DIR_MASK) == WINE_GCPW_LOOSE_RTL)
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State.uBidiLevel = 1;
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else if ((dwWineGCP_Flags&WINE_GCPW_DIR_MASK) == WINE_GCPW_LOOSE_LTR)
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State.uBidiLevel = 0;
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if (dwWineGCP_Flags & WINE_GCPW_LOOSE_MASK)
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{
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for (j = 0; j < i; ++j)
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if (chartype[j] == L)
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{
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State.uBidiLevel = 0;
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break;
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}
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else if (chartype[j] == R || chartype[j] == AL)
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{
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State.uBidiLevel = 1;
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break;
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}
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}
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res = ScriptItemize(lpString + done, i, maxItems, &Control, &State, pItems, &nItems);
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while (res == E_OUTOFMEMORY)
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{
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maxItems = maxItems * 2;
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pItems = HeapReAlloc(GetProcessHeap(), 0, pItems, sizeof(SCRIPT_ITEM) * maxItems);
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if (!pItems)
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{
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WARN("Out of memory\n");
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HeapFree(GetProcessHeap(), 0, chartype);
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HeapFree(GetProcessHeap(), 0, levels);
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HeapFree(GetProcessHeap(), 0, run_glyphs);
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HeapFree(GetProcessHeap(), 0, pwLogClust);
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HeapFree(GetProcessHeap(), 0, psva);
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return FALSE;
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}
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res = ScriptItemize(lpString + done, i, maxItems, &Control, &State, pItems, &nItems);
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}
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if (lpOutString || lpOrder)
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for (j = 0; j < nItems; j++)
|
|
{
|
|
int k;
|
|
for (k = pItems[j].iCharPos; k < pItems[j+1].iCharPos; k++)
|
|
levels[k] = pItems[j].a.s.uBidiLevel;
|
|
}
|
|
|
|
if (lpOutString)
|
|
{
|
|
/* assign directional types again, but for WS, S this time */
|
|
classify(lpString + done, chartype, i);
|
|
|
|
BidiLines(State.uBidiLevel, lpOutString + done, lpString + done,
|
|
chartype, levels, i, 0);
|
|
}
|
|
|
|
if (lpOrder)
|
|
{
|
|
int k, lastgood;
|
|
for (j = lastgood = 0; j < i; ++j)
|
|
if (levels[j] != levels[lastgood])
|
|
{
|
|
--j;
|
|
if (odd(levels[lastgood]))
|
|
for (k = j; k >= lastgood; --k)
|
|
lpOrder[done + k] = done + j - k;
|
|
else
|
|
for (k = lastgood; k <= j; ++k)
|
|
lpOrder[done + k] = done + k;
|
|
lastgood = ++j;
|
|
}
|
|
if (odd(levels[lastgood]))
|
|
for (k = j - 1; k >= lastgood; --k)
|
|
lpOrder[done + k] = done + j - 1 - k;
|
|
else
|
|
for (k = lastgood; k < j; ++k)
|
|
lpOrder[done + k] = done + k;
|
|
}
|
|
|
|
if (lpGlyphs && doGlyphs)
|
|
{
|
|
BYTE *runOrder;
|
|
int *visOrder;
|
|
SCRIPT_ITEM *curItem;
|
|
|
|
runOrder = HeapAlloc(GetProcessHeap(), 0, maxItems * sizeof(*runOrder));
|
|
visOrder = HeapAlloc(GetProcessHeap(), 0, maxItems * sizeof(*visOrder));
|
|
if (!runOrder || !visOrder)
|
|
{
|
|
WARN("Out of memory\n");
|
|
HeapFree(GetProcessHeap(), 0, runOrder);
|
|
HeapFree(GetProcessHeap(), 0, visOrder);
|
|
HeapFree(GetProcessHeap(), 0, chartype);
|
|
HeapFree(GetProcessHeap(), 0, levels);
|
|
HeapFree(GetProcessHeap(), 0, pItems);
|
|
HeapFree(GetProcessHeap(), 0, psva);
|
|
HeapFree(GetProcessHeap(), 0, pwLogClust);
|
|
return FALSE;
|
|
}
|
|
|
|
for (j = 0; j < nItems; j++)
|
|
runOrder[j] = pItems[j].a.s.uBidiLevel;
|
|
|
|
ScriptLayout(nItems, runOrder, visOrder, NULL);
|
|
|
|
for (j = 0; j < nItems; j++)
|
|
{
|
|
int k;
|
|
int cChars,cOutGlyphs;
|
|
curItem = &pItems[visOrder[j]];
|
|
|
|
cChars = pItems[visOrder[j]+1].iCharPos - curItem->iCharPos;
|
|
|
|
res = ScriptShape(hDC, &psc, lpString + done + curItem->iCharPos, cChars, cMaxGlyphs, &curItem->a, run_glyphs, pwLogClust, psva, &cOutGlyphs);
|
|
while (res == E_OUTOFMEMORY)
|
|
{
|
|
cMaxGlyphs *= 2;
|
|
run_glyphs = HeapReAlloc(GetProcessHeap(), 0, run_glyphs, sizeof(WORD) * cMaxGlyphs);
|
|
if (!run_glyphs)
|
|
{
|
|
WARN("Out of memory\n");
|
|
HeapFree(GetProcessHeap(), 0, runOrder);
|
|
HeapFree(GetProcessHeap(), 0, visOrder);
|
|
HeapFree(GetProcessHeap(), 0, chartype);
|
|
HeapFree(GetProcessHeap(), 0, levels);
|
|
HeapFree(GetProcessHeap(), 0, pItems);
|
|
HeapFree(GetProcessHeap(), 0, psva);
|
|
HeapFree(GetProcessHeap(), 0, pwLogClust);
|
|
HeapFree(GetProcessHeap(), 0, *lpGlyphs);
|
|
ScriptFreeCache(&psc);
|
|
*lpGlyphs = NULL;
|
|
return FALSE;
|
|
}
|
|
res = ScriptShape(hDC, &psc, lpString + done + curItem->iCharPos, cChars, cMaxGlyphs, &curItem->a, run_glyphs, pwLogClust, psva, &cOutGlyphs);
|
|
}
|
|
if (res)
|
|
{
|
|
if (res == USP_E_SCRIPT_NOT_IN_FONT)
|
|
TRACE("Unable to shape with currently selected font\n");
|
|
else
|
|
FIXME("Unable to shape string (%x)\n",res);
|
|
j = nItems;
|
|
doGlyphs = FALSE;
|
|
HeapFree(GetProcessHeap(), 0, *lpGlyphs);
|
|
*lpGlyphs = NULL;
|
|
}
|
|
else
|
|
{
|
|
if (*lpGlyphs)
|
|
*lpGlyphs = HeapReAlloc(GetProcessHeap(), 0, *lpGlyphs, sizeof(WORD) * (glyph_i + cOutGlyphs));
|
|
else
|
|
*lpGlyphs = HeapAlloc(GetProcessHeap(), 0, sizeof(WORD) * (glyph_i + cOutGlyphs));
|
|
for (k = 0; k < cOutGlyphs; k++)
|
|
(*lpGlyphs)[glyph_i+k] = run_glyphs[k];
|
|
glyph_i += cOutGlyphs;
|
|
}
|
|
}
|
|
HeapFree(GetProcessHeap(), 0, runOrder);
|
|
HeapFree(GetProcessHeap(), 0, visOrder);
|
|
}
|
|
|
|
done += i;
|
|
}
|
|
if (cGlyphs)
|
|
*cGlyphs = glyph_i;
|
|
|
|
HeapFree(GetProcessHeap(), 0, chartype);
|
|
HeapFree(GetProcessHeap(), 0, levels);
|
|
HeapFree(GetProcessHeap(), 0, pItems);
|
|
HeapFree(GetProcessHeap(), 0, run_glyphs);
|
|
HeapFree(GetProcessHeap(), 0, pwLogClust);
|
|
HeapFree(GetProcessHeap(), 0, psva);
|
|
ScriptFreeCache(&psc);
|
|
return TRUE;
|
|
}
|