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/*
* GDI BiDirectional handling
*
* Copyright 2003 Shachar Shemesh
* Copyright 2007 Maarten Lankhorst
* Copyright 2010 CodeWeavers, Aric Stewart
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* Code derived from the modified reference implementation
* that was found in revision 17 of http://unicode.org/reports/tr9/
* "Unicode Standard Annex #9: THE BIDIRECTIONAL ALGORITHM"
*
* -- Copyright (C) 1999-2005, ASMUS, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of the Unicode data files and any associated documentation (the
* "Data Files") or Unicode software and any associated documentation (the
* "Software") to deal in the Data Files or Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, and/or sell copies of the Data Files or Software,
* and to permit persons to whom the Data Files or Software are furnished
* to do so, provided that (a) the above copyright notice(s) and this
* permission notice appear with all copies of the Data Files or Software,
* (b) both the above copyright notice(s) and this permission notice appear
* in associated documentation, and (c) there is clear notice in each
* modified Data File or in the Software as well as in the documentation
* associated with the Data File(s) or Software that the data or software
* has been modified.
*/
#include "config.h"
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winnls.h"
#include "usp10.h"
#include "wine/debug.h"
#include "gdi_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(bidi);
/* HELPER FUNCTIONS AND DECLARATIONS */
#define odd(x) ((x) & 1)
extern const unsigned short bidi_direction_table[] DECLSPEC_HIDDEN;
/*------------------------------------------------------------------------
Bidirectional Character Types
as defined by the Unicode Bidirectional Algorithm Table 3-7.
Note:
The list of bidirectional character types here is not grouped the
same way as the table 3-7, since the numeric values for the types
are chosen to keep the state and action tables compact.
------------------------------------------------------------------------*/
enum directions
{
/* input types */
/* ON MUST be zero, code relies on ON = N = 0 */
ON = 0, /* Other Neutral */
L, /* Left Letter */
R, /* Right Letter */
AN, /* Arabic Number */
EN, /* European Number */
AL, /* Arabic Letter (Right-to-left) */
NSM, /* Non-spacing Mark */
CS, /* Common Separator */
ES, /* European Separator */
ET, /* European Terminator (post/prefix e.g. $ and %) */
/* resolved types */
BN, /* Boundary neutral (type of RLE etc after explicit levels) */
/* input types, */
S, /* Segment Separator (TAB) // used only in L1 */
WS, /* White space // used only in L1 */
B, /* Paragraph Separator (aka as PS) */
/* types for explicit controls */
RLO, /* these are used only in X1-X9 */
RLE,
LRO,
LRE,
PDF,
LRI, /* Isolate formatting characters new with 6.3 */
RLI,
FSI,
PDI,
/* resolved types, also resolved directions */
NI = ON, /* alias, where ON, WS and S are treated the same */
};
/* HELPER FUNCTIONS */
static inline unsigned short get_table_entry(const unsigned short *table, WCHAR ch)
{
return table[table[table[ch >> 8] + ((ch >> 4) & 0x0f)] + (ch & 0xf)];
}
/* Convert the libwine information to the direction enum */
static void classify(LPCWSTR lpString, WORD *chartype, DWORD uCount)
{
unsigned i;
for (i = 0; i < uCount; ++i)
chartype[i] = get_table_entry( bidi_direction_table, lpString[i] );
}
/* Set a run of cval values at locations all prior to, but not including */
/* iStart, to the new value nval. */
static void SetDeferredRun(BYTE *pval, int cval, int iStart, int nval)
{
int i = iStart - 1;
for (; i >= iStart - cval; i--)
{
pval[i] = nval;
}
}
/* THE PARAGRAPH LEVEL */
/*------------------------------------------------------------------------
Function: resolveParagraphs
Resolves the input strings into blocks over which the algorithm
is then applied.
Implements Rule P1 of the Unicode Bidi Algorithm
Input: Text string
Character count
Output: revised character count
Note: This is a very simplistic function. In effect it restricts
the action of the algorithm to the first paragraph in the input
where a paragraph ends at the end of the first block separator
or at the end of the input text.
------------------------------------------------------------------------*/
static int resolveParagraphs(WORD *types, int cch)
{
/* skip characters not of type B */
int ich = 0;
for(; ich < cch && types[ich] != B; ich++);
/* stop after first B, make it a BN for use in the next steps */
if (ich < cch && types[ich] == B)
types[ich++] = BN;
return ich;
}
/* REORDER */
/*------------------------------------------------------------------------
Function: resolveLines
Breaks a paragraph into lines
Input: Array of line break flags
Character count
In/Out: Array of characters
Returns the count of characters on the first line
Note: This function only breaks lines at hard line breaks. Other
line breaks can be passed in. If pbrk[n] is TRUE, then a break
occurs after the character in pszInput[n]. Breaks before the first
character are not allowed.
------------------------------------------------------------------------*/
static int resolveLines(LPCWSTR pszInput, const BOOL * pbrk, int cch)
{
/* skip characters not of type LS */
int ich = 0;
for(; ich < cch; ich++)
{
if (pszInput[ich] == (WCHAR)'\n' || (pbrk && pbrk[ich]))
{
ich++;
break;
}
}
return ich;
}
/*------------------------------------------------------------------------
Function: resolveWhiteSpace
Resolves levels for WS and S
Implements rule L1 of the Unicode bidi Algorithm.
Input: Base embedding level
Character count
Array of direction classes (for one line of text)
In/Out: Array of embedding levels (for one line of text)
Note: this should be applied a line at a time. The default driver
code supplied in this file assumes a single line of text; for
a real implementation, cch and the initial pointer values
would have to be adjusted.
------------------------------------------------------------------------*/
static void resolveWhitespace(int baselevel, const WORD *pcls, BYTE *plevel, int cch)
{
int cchrun = 0;
BYTE oldlevel = baselevel;
int ich = 0;
for (; ich < cch; ich++)
{
switch(pcls[ich])
{
default:
cchrun = 0; /* any other character breaks the run */
break;
case WS:
cchrun++;
break;
case RLE:
case LRE:
case LRO:
case RLO:
case PDF:
case LRI:
case RLI:
case FSI:
case PDI:
case BN:
plevel[ich] = oldlevel;
cchrun++;
break;
case S:
case B:
/* reset levels for WS before eot */
SetDeferredRun(plevel, cchrun, ich, baselevel);
cchrun = 0;
plevel[ich] = baselevel;
break;
}
oldlevel = plevel[ich];
}
/* reset level before eot */
SetDeferredRun(plevel, cchrun, ich, baselevel);
}
/*------------------------------------------------------------------------
Function: BidiLines
Implements the Line-by-Line phases of the Unicode Bidi Algorithm
Input: Count of characters
Array of character directions
Inp/Out: Input text
Array of levels
------------------------------------------------------------------------*/
static void BidiLines(int baselevel, LPWSTR pszOutLine, LPCWSTR pszLine, const WORD * pclsLine,
BYTE * plevelLine, int cchPara, const BOOL * pbrk)
{
int cchLine = 0;
int done = 0;
int *run;
run = HeapAlloc(GetProcessHeap(), 0, cchPara * sizeof(int));
if (!run)
{
WARN("Out of memory\n");
return;
}
do
{
/* break lines at LS */
cchLine = resolveLines(pszLine, pbrk, cchPara);
/* resolve whitespace */
resolveWhitespace(baselevel, pclsLine, plevelLine, cchLine);
if (pszOutLine)
{
int i;
/* reorder each line in place */
ScriptLayout(cchLine, plevelLine, NULL, run);
for (i = 0; i < cchLine; i++)
pszOutLine[done+run[i]] = pszLine[i];
}
pszLine += cchLine;
plevelLine += cchLine;
pbrk += pbrk ? cchLine : 0;
pclsLine += cchLine;
cchPara -= cchLine;
done += cchLine;
} while (cchPara);
HeapFree(GetProcessHeap(), 0, run);
}
/*************************************************************
* BIDI_Reorder
*
* Returns TRUE if reordering was required and done.
*/
BOOL BIDI_Reorder(
HDC hDC, /*[in] Display DC */
LPCWSTR lpString, /* [in] The string for which information is to be returned */
INT uCount, /* [in] Number of WCHARs in string. */
DWORD dwFlags, /* [in] GetCharacterPlacement compatible flags specifying how to process the string */
DWORD dwWineGCP_Flags, /* [in] Wine internal flags - Force paragraph direction */
LPWSTR lpOutString, /* [out] Reordered string */
INT uCountOut, /* [in] Size of output buffer */
UINT *lpOrder, /* [out] Logical -> Visual order map */
WORD **lpGlyphs, /* [out] reordered, mirrored, shaped glyphs to display */
INT *cGlyphs /* [out] number of glyphs generated */
)
{
WORD *chartype;
BYTE *levels;
INT i, done;
unsigned glyph_i;
BOOL is_complex;
int maxItems;
int nItems;
SCRIPT_CONTROL Control;
SCRIPT_STATE State;
SCRIPT_ITEM *pItems;
HRESULT res;
SCRIPT_CACHE psc = NULL;
WORD *run_glyphs = NULL;
WORD *pwLogClust = NULL;
SCRIPT_VISATTR *psva = NULL;
DWORD cMaxGlyphs = 0;
BOOL doGlyphs = TRUE;
TRACE("%s, %d, 0x%08x lpOutString=%p, lpOrder=%p\n",
debugstr_wn(lpString, uCount), uCount, dwFlags,
lpOutString, lpOrder);
memset(&Control, 0, sizeof(Control));
memset(&State, 0, sizeof(State));
if (lpGlyphs)
*lpGlyphs = NULL;
if (!(dwFlags & GCP_REORDER))
{
FIXME("Asked to reorder without reorder flag set\n");
return FALSE;
}
if (lpOutString && uCountOut < uCount)
{
FIXME("lpOutString too small\n");
return FALSE;
}
chartype = HeapAlloc(GetProcessHeap(), 0, uCount * sizeof(WORD));
if (!chartype)
{
WARN("Out of memory\n");
return FALSE;
}
if (lpOutString)
memcpy(lpOutString, lpString, uCount * sizeof(WCHAR));
is_complex = FALSE;
for (i = 0; i < uCount && !is_complex; i++)
{
if ((lpString[i] >= 0x900 && lpString[i] <= 0xfff) ||
(lpString[i] >= 0x1cd0 && lpString[i] <= 0x1cff) ||
(lpString[i] >= 0xa840 && lpString[i] <= 0xa8ff))
is_complex = TRUE;
}
/* Verify reordering will be required */
if ((WINE_GCPW_FORCE_RTL == (dwWineGCP_Flags&WINE_GCPW_DIR_MASK)) ||
((dwWineGCP_Flags&WINE_GCPW_DIR_MASK) == WINE_GCPW_LOOSE_RTL))
State.uBidiLevel = 1;
else if (!is_complex)
{
done = 1;
classify(lpString, chartype, uCount);
for (i = 0; i < uCount; i++)
switch (chartype[i])
{
case R:
case AL:
case RLE:
case RLO:
done = 0;
break;
}
if (done)
{
HeapFree(GetProcessHeap(), 0, chartype);
if (lpOrder)
{
for (i = 0; i < uCount; i++)
lpOrder[i] = i;
}
return TRUE;
}
}
levels = HeapAlloc(GetProcessHeap(), 0, uCount * sizeof(BYTE));
if (!levels)
{
WARN("Out of memory\n");
HeapFree(GetProcessHeap(), 0, chartype);
return FALSE;
}
maxItems = 5;
pItems = HeapAlloc(GetProcessHeap(),0, maxItems * sizeof(SCRIPT_ITEM));
if (!pItems)
{
WARN("Out of memory\n");
HeapFree(GetProcessHeap(), 0, chartype);
HeapFree(GetProcessHeap(), 0, levels);
return FALSE;
}
if (lpGlyphs)
{
cMaxGlyphs = 1.5 * uCount + 16;
run_glyphs = HeapAlloc(GetProcessHeap(),0,sizeof(WORD) * cMaxGlyphs);
if (!run_glyphs)
{
WARN("Out of memory\n");
HeapFree(GetProcessHeap(), 0, chartype);
HeapFree(GetProcessHeap(), 0, levels);
HeapFree(GetProcessHeap(), 0, pItems);
return FALSE;
}
pwLogClust = HeapAlloc(GetProcessHeap(),0,sizeof(WORD) * uCount);
if (!pwLogClust)
{
WARN("Out of memory\n");
HeapFree(GetProcessHeap(), 0, chartype);
HeapFree(GetProcessHeap(), 0, levels);
HeapFree(GetProcessHeap(), 0, pItems);
HeapFree(GetProcessHeap(), 0, run_glyphs);
return FALSE;
}
psva = HeapAlloc(GetProcessHeap(),0,sizeof(SCRIPT_VISATTR) * uCount);
if (!psva)
{
WARN("Out of memory\n");
HeapFree(GetProcessHeap(), 0, chartype);
HeapFree(GetProcessHeap(), 0, levels);
HeapFree(GetProcessHeap(), 0, pItems);
HeapFree(GetProcessHeap(), 0, run_glyphs);
HeapFree(GetProcessHeap(), 0, pwLogClust);
return FALSE;
}
}
done = 0;
glyph_i = 0;
while (done < uCount)
{
INT j;
classify(lpString + done, chartype, uCount - done);
/* limit text to first block */
i = resolveParagraphs(chartype, uCount - done);
for (j = 0; j < i; ++j)
switch(chartype[j])
{
case B:
case S:
case WS:
case ON: chartype[j] = NI;
default: continue;
}
if ((dwWineGCP_Flags&WINE_GCPW_DIR_MASK) == WINE_GCPW_LOOSE_RTL)
State.uBidiLevel = 1;
else if ((dwWineGCP_Flags&WINE_GCPW_DIR_MASK) == WINE_GCPW_LOOSE_LTR)
State.uBidiLevel = 0;
if (dwWineGCP_Flags & WINE_GCPW_LOOSE_MASK)
{
for (j = 0; j < i; ++j)
if (chartype[j] == L)
{
State.uBidiLevel = 0;
break;
}
else if (chartype[j] == R || chartype[j] == AL)
{
State.uBidiLevel = 1;
break;
}
}
res = ScriptItemize(lpString + done, i, maxItems, &Control, &State, pItems, &nItems);
while (res == E_OUTOFMEMORY)
{
maxItems = maxItems * 2;
pItems = HeapReAlloc(GetProcessHeap(), 0, pItems, sizeof(SCRIPT_ITEM) * maxItems);
if (!pItems)
{
WARN("Out of memory\n");
HeapFree(GetProcessHeap(), 0, chartype);
HeapFree(GetProcessHeap(), 0, levels);
HeapFree(GetProcessHeap(), 0, run_glyphs);
HeapFree(GetProcessHeap(), 0, pwLogClust);
HeapFree(GetProcessHeap(), 0, psva);
return FALSE;
}
res = ScriptItemize(lpString + done, i, maxItems, &Control, &State, pItems, &nItems);
}
if (lpOutString || lpOrder)
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;
}
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