527 lines
15 KiB
C
527 lines
15 KiB
C
/*
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* Implementation of Shaping for the Uniscribe Script Processor (usp10.dll)
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*
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* Copyright 2010 CodeWeavers, Aric Stewart
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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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*/
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#include <stdarg.h>
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#include "windef.h"
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#include "winbase.h"
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#include "wingdi.h"
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#include "winuser.h"
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#include "winnls.h"
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#include "usp10.h"
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#include "winternl.h"
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#include "usp10_internal.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(uniscribe);
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#define FIRST_ARABIC_CHAR 0x0600
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#define LAST_ARABIC_CHAR 0x06ff
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extern const unsigned short wine_shaping_table[];
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extern const unsigned short wine_shaping_forms[LAST_ARABIC_CHAR - FIRST_ARABIC_CHAR + 1][4];
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enum joining_types {
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jtU,
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jtT,
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jtR,
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jtL,
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jtD,
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jtC
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};
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enum joined_forms {
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Xn=0,
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Xl,
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Xr,
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Xm
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};
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#ifdef WORDS_BIGENDIAN
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#define GET_BE_WORD(x) (x)
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#else
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#define GET_BE_WORD(x) RtlUshortByteSwap(x)
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#endif
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/* These are all structures needed for the GSUB table */
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#define MS_MAKE_TAG( _x1, _x2, _x3, _x4 ) \
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( ( (ULONG)_x4 << 24 ) | \
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( (ULONG)_x3 << 16 ) | \
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( (ULONG)_x2 << 8 ) | \
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(ULONG)_x1 )
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#define GSUB_TAG MS_MAKE_TAG('G', 'S', 'U', 'B')
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typedef struct {
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DWORD version;
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WORD ScriptList;
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WORD FeatureList;
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WORD LookupList;
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} GSUB_Header;
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typedef struct {
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CHAR ScriptTag[4];
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WORD Script;
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} GSUB_ScriptRecord;
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typedef struct {
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WORD ScriptCount;
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GSUB_ScriptRecord ScriptRecord[1];
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} GSUB_ScriptList;
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typedef struct {
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CHAR LangSysTag[4];
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WORD LangSys;
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} GSUB_LangSysRecord;
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typedef struct {
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WORD DefaultLangSys;
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WORD LangSysCount;
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GSUB_LangSysRecord LangSysRecord[1];
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} GSUB_Script;
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typedef struct {
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WORD LookupOrder; /* Reserved */
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WORD ReqFeatureIndex;
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WORD FeatureCount;
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WORD FeatureIndex[1];
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} GSUB_LangSys;
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typedef struct {
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CHAR FeatureTag[4];
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WORD Feature;
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} GSUB_FeatureRecord;
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typedef struct {
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WORD FeatureCount;
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GSUB_FeatureRecord FeatureRecord[1];
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} GSUB_FeatureList;
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typedef struct {
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WORD FeatureParams; /* Reserved */
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WORD LookupCount;
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WORD LookupListIndex[1];
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} GSUB_Feature;
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typedef struct {
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WORD LookupCount;
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WORD Lookup[1];
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} GSUB_LookupList;
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typedef struct {
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WORD LookupType;
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WORD LookupFlag;
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WORD SubTableCount;
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WORD SubTable[1];
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} GSUB_LookupTable;
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typedef struct {
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WORD CoverageFormat;
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WORD GlyphCount;
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WORD GlyphArray[1];
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} GSUB_CoverageFormat1;
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typedef struct {
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WORD Start;
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WORD End;
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WORD StartCoverageIndex;
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} GSUB_RangeRecord;
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typedef struct {
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WORD CoverageFormat;
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WORD RangeCount;
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GSUB_RangeRecord RangeRecord[1];
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} GSUB_CoverageFormat2;
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typedef struct {
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WORD SubstFormat; /* = 1 */
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WORD Coverage;
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WORD DeltaGlyphID;
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} GSUB_SingleSubstFormat1;
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typedef struct {
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WORD SubstFormat; /* = 2 */
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WORD Coverage;
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WORD GlyphCount;
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WORD Substitute[1];
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}GSUB_SingleSubstFormat2;
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/* the orders of joined_forms and contextual_features need to line up */
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static const char* contextual_features[] =
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{
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"isol",
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"fina",
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"init",
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"medi"
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};
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static INT GSUB_is_glyph_covered(LPCVOID table , UINT glyph)
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{
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const GSUB_CoverageFormat1* cf1;
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cf1 = table;
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if (GET_BE_WORD(cf1->CoverageFormat) == 1)
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{
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int count = GET_BE_WORD(cf1->GlyphCount);
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int i;
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TRACE("Coverage Format 1, %i glyphs\n",count);
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for (i = 0; i < count; i++)
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if (glyph == GET_BE_WORD(cf1->GlyphArray[i]))
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return i;
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return -1;
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}
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else if (GET_BE_WORD(cf1->CoverageFormat) == 2)
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{
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const GSUB_CoverageFormat2* cf2;
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int i;
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int count;
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cf2 = (const GSUB_CoverageFormat2*)cf1;
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count = GET_BE_WORD(cf2->RangeCount);
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TRACE("Coverage Format 2, %i ranges\n",count);
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for (i = 0; i < count; i++)
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{
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if (glyph < GET_BE_WORD(cf2->RangeRecord[i].Start))
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return -1;
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if ((glyph >= GET_BE_WORD(cf2->RangeRecord[i].Start)) &&
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(glyph <= GET_BE_WORD(cf2->RangeRecord[i].End)))
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{
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return (GET_BE_WORD(cf2->RangeRecord[i].StartCoverageIndex) +
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glyph - GET_BE_WORD(cf2->RangeRecord[i].Start));
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}
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}
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return -1;
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}
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else
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ERR("Unknown CoverageFormat %i\n",GET_BE_WORD(cf1->CoverageFormat));
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return -1;
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}
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static const GSUB_Script* GSUB_get_script_table( const GSUB_Header* header, const char* tag)
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{
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const GSUB_ScriptList *script;
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const GSUB_Script *deflt = NULL;
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int i;
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script = (const GSUB_ScriptList*)((const BYTE*)header + GET_BE_WORD(header->ScriptList));
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TRACE("%i scripts in this font\n",GET_BE_WORD(script->ScriptCount));
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for (i = 0; i < GET_BE_WORD(script->ScriptCount); i++)
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{
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const GSUB_Script *scr;
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int offset;
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offset = GET_BE_WORD(script->ScriptRecord[i].Script);
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scr = (const GSUB_Script*)((const BYTE*)script + offset);
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if (strncmp(script->ScriptRecord[i].ScriptTag, tag,4)==0)
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return scr;
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if (strncmp(script->ScriptRecord[i].ScriptTag, "dflt",4)==0)
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deflt = scr;
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}
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return deflt;
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}
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static const GSUB_LangSys* GSUB_get_lang_table( const GSUB_Script* script, const char* tag)
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{
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int i;
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int offset;
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const GSUB_LangSys *Lang;
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TRACE("Deflang %x, LangCount %i\n",GET_BE_WORD(script->DefaultLangSys), GET_BE_WORD(script->LangSysCount));
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for (i = 0; i < GET_BE_WORD(script->LangSysCount) ; i++)
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{
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offset = GET_BE_WORD(script->LangSysRecord[i].LangSys);
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Lang = (const GSUB_LangSys*)((const BYTE*)script + offset);
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if ( strncmp(script->LangSysRecord[i].LangSysTag,tag,4)==0)
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return Lang;
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}
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offset = GET_BE_WORD(script->DefaultLangSys);
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if (offset)
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{
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Lang = (const GSUB_LangSys*)((const BYTE*)script + offset);
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return Lang;
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}
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return NULL;
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}
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static const GSUB_Feature * GSUB_get_feature(const GSUB_Header *header, const GSUB_LangSys *lang, const char* tag)
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{
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int i;
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const GSUB_FeatureList *feature;
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feature = (const GSUB_FeatureList*)((const BYTE*)header + GET_BE_WORD(header->FeatureList));
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TRACE("%i features\n",GET_BE_WORD(lang->FeatureCount));
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for (i = 0; i < GET_BE_WORD(lang->FeatureCount); i++)
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{
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int index = GET_BE_WORD(lang->FeatureIndex[i]);
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if (strncmp(feature->FeatureRecord[index].FeatureTag,tag,4)==0)
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{
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const GSUB_Feature *feat;
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feat = (const GSUB_Feature*)((const BYTE*)feature + GET_BE_WORD(feature->FeatureRecord[index].Feature));
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return feat;
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}
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}
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return NULL;
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}
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static UINT GSUB_apply_feature(const GSUB_Header * header, const GSUB_Feature* feature, UINT glyph)
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{
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int i;
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int offset;
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const GSUB_LookupList *lookup;
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lookup = (const GSUB_LookupList*)((const BYTE*)header + GET_BE_WORD(header->LookupList));
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TRACE("%i lookups\n", GET_BE_WORD(feature->LookupCount));
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for (i = 0; i < GET_BE_WORD(feature->LookupCount); i++)
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{
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const GSUB_LookupTable *look;
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offset = GET_BE_WORD(lookup->Lookup[GET_BE_WORD(feature->LookupListIndex[i])]);
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look = (const GSUB_LookupTable*)((const BYTE*)lookup + offset);
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TRACE("type %i, flag %x, subtables %i\n",GET_BE_WORD(look->LookupType),GET_BE_WORD(look->LookupFlag),GET_BE_WORD(look->SubTableCount));
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if (GET_BE_WORD(look->LookupType) != 1)
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FIXME("We only handle SubType 1 (%i)\n",GET_BE_WORD(look->LookupType));
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else
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{
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int j;
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for (j = 0; j < GET_BE_WORD(look->SubTableCount); j++)
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{
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const GSUB_SingleSubstFormat1 *ssf1;
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offset = GET_BE_WORD(look->SubTable[j]);
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ssf1 = (const GSUB_SingleSubstFormat1*)((const BYTE*)look+offset);
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if (GET_BE_WORD(ssf1->SubstFormat) == 1)
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{
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int offset = GET_BE_WORD(ssf1->Coverage);
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TRACE(" subtype 1, delta %i\n", GET_BE_WORD(ssf1->DeltaGlyphID));
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if (GSUB_is_glyph_covered((const BYTE*)ssf1+offset, glyph) != -1)
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{
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TRACE(" Glyph 0x%x ->",glyph);
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glyph += GET_BE_WORD(ssf1->DeltaGlyphID);
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TRACE(" 0x%x\n",glyph);
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}
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}
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else
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{
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const GSUB_SingleSubstFormat2 *ssf2;
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INT index;
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INT offset;
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ssf2 = (const GSUB_SingleSubstFormat2 *)ssf1;
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offset = GET_BE_WORD(ssf1->Coverage);
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TRACE(" subtype 2, glyph count %i\n", GET_BE_WORD(ssf2->GlyphCount));
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index = GSUB_is_glyph_covered((const BYTE*)ssf2+offset, glyph);
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TRACE(" Coverage index %i\n",index);
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if (index != -1)
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{
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TRACE(" Glyph is 0x%x ->",glyph);
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glyph = GET_BE_WORD(ssf2->Substitute[index]);
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TRACE("0x%x\n",glyph);
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}
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}
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}
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}
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}
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return glyph;
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}
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static const char* get_opentype_script(HDC hdc)
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{
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/*
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* I am not sure if this is the correct way to generate our script tag
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*/
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UINT charset = GetTextCharsetInfo(hdc, NULL, 0x0);
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switch (charset)
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{
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case ANSI_CHARSET: return "latn";
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case BALTIC_CHARSET: return "latn"; /* ?? */
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case CHINESEBIG5_CHARSET: return "hani";
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case EASTEUROPE_CHARSET: return "latn"; /* ?? */
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case GB2312_CHARSET: return "hani";
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case GREEK_CHARSET: return "grek";
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case HANGUL_CHARSET: return "hang";
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case RUSSIAN_CHARSET: return "cyrl";
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case SHIFTJIS_CHARSET: return "kana";
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case TURKISH_CHARSET: return "latn"; /* ?? */
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case VIETNAMESE_CHARSET: return "latn";
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case JOHAB_CHARSET: return "latn"; /* ?? */
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case ARABIC_CHARSET: return "arab";
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case HEBREW_CHARSET: return "hebr";
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case THAI_CHARSET: return "thai";
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default: return "latn";
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}
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}
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static WORD get_GSUB_feature_glyph(HDC hdc, void* GSUB_Table, UINT glyph, const char* feat)
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{
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const GSUB_Header *header;
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const GSUB_Script *script;
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const GSUB_LangSys *language;
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const GSUB_Feature *feature;
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if (!GSUB_Table)
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return glyph;
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header = GSUB_Table;
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script = GSUB_get_script_table(header, get_opentype_script(hdc));
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if (!script)
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{
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TRACE("Script not found\n");
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return glyph;
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}
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language = GSUB_get_lang_table(script, "xxxx"); /* Need to get Lang tag */
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if (!language)
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{
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TRACE("Language not found\n");
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return glyph;
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}
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feature = GSUB_get_feature(header, language, feat);
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if (!feature)
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{
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TRACE("%s feature not found\n",feat);
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return glyph;
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}
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return GSUB_apply_feature(header, feature, glyph);
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}
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static VOID *load_gsub_table(HDC hdc)
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{
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VOID* GSUB_Table = NULL;
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int length = GetFontData(hdc, GSUB_TAG , 0, NULL, 0);
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if (length != GDI_ERROR)
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{
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GSUB_Table = HeapAlloc(GetProcessHeap(),0,length);
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GetFontData(hdc, GSUB_TAG , 0, GSUB_Table, length);
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TRACE("Loaded GSUB table of %i bytes\n",length);
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}
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return GSUB_Table;
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}
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static CHAR neighbour_joining_type(int i, int delta, const CHAR* context_type, INT cchLen, SCRIPT_ANALYSIS *psa)
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{
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if (i + delta < 0)
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{
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if (psa->fLinkBefore)
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return jtR;
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else
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return jtU;
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}
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if ( i+ delta >= cchLen)
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{
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if (psa->fLinkAfter)
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return jtL;
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else
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return jtU;
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}
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i += delta;
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if (context_type[i] == jtT)
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return neighbour_joining_type(i,delta,context_type,cchLen,psa);
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else
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return context_type[i];
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}
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static inline BOOL right_join_causing(CHAR joining_type)
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{
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return (joining_type == jtR || joining_type == jtD || joining_type == jtC);
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}
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static inline BOOL left_join_causing(CHAR joining_type)
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{
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return (joining_type == jtL || joining_type == jtD || joining_type == jtC);
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}
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/* SHAPE_ShapeArabicGlyphs
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*/
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void SHAPE_ShapeArabicGlyphs(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WCHAR* pwcChars, INT cChars, WORD* pwOutGlyphs, INT cMaxGlyphs)
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{
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CHAR *context_type;
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INT *context_shape;
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INT dirR, dirL;
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int i;
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if (psa->eScript != Script_Arabic)
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return;
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if (!psa->fLogicalOrder && psa->fRTL)
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{
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dirR = -1;
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dirL = 1;
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}
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else
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{
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dirR = 1;
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dirL = -1;
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}
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if (!psc->GSUB_Table)
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psc->GSUB_Table = load_gsub_table(hdc);
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context_type = HeapAlloc(GetProcessHeap(),0,cChars);
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context_shape = HeapAlloc(GetProcessHeap(),0,sizeof(INT) * cChars);
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for (i = 0; i < cChars; i++)
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context_type[i] = wine_shaping_table[wine_shaping_table[pwcChars[i] >> 8] + (pwcChars[i] & 0xff)];
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for (i = 0; i < cChars; i++)
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{
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if (context_type[i] == jtR && right_join_causing(neighbour_joining_type(i,dirR,context_type,cChars,psa)))
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context_shape[i] = Xr;
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else if (context_type[i] == jtL && left_join_causing(neighbour_joining_type(i,dirL,context_type,cChars,psa)))
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context_shape[i] = Xl;
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else if (context_type[i] == jtD && left_join_causing(neighbour_joining_type(i,dirL,context_type,cChars,psa)) && right_join_causing(neighbour_joining_type(i,dirR,context_type,cChars,psa)))
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context_shape[i] = Xm;
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else if (context_type[i] == jtD && right_join_causing(neighbour_joining_type(i,dirR,context_type,cChars,psa)))
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context_shape[i] = Xr;
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else if (context_type[i] == jtD && left_join_causing(neighbour_joining_type(i,dirL,context_type,cChars,psa)))
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context_shape[i] = Xl;
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else
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context_shape[i] = Xn;
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}
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for (i = 0; i < cChars; i++)
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{
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WORD newGlyph = pwOutGlyphs[i];
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if (psc->GSUB_Table)
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newGlyph = get_GSUB_feature_glyph(hdc, psc->GSUB_Table, pwOutGlyphs[i], contextual_features[context_shape[i]]);
|
|
if (newGlyph == pwOutGlyphs[i] && pwcChars[i] >= FIRST_ARABIC_CHAR && pwcChars[i] <= LAST_ARABIC_CHAR)
|
|
{
|
|
/* fall back to presentation form B */
|
|
WCHAR context_char = wine_shaping_forms[pwcChars[i] - FIRST_ARABIC_CHAR][context_shape[i]];
|
|
if (context_char != pwcChars[i] && GetGlyphIndicesW(hdc, &context_char, 1, &newGlyph, 0) != GDI_ERROR && newGlyph != 0x0000)
|
|
pwOutGlyphs[i] = newGlyph;
|
|
}
|
|
else if (newGlyph != pwOutGlyphs[i])
|
|
pwOutGlyphs[i] = newGlyph;
|
|
}
|
|
|
|
HeapFree(GetProcessHeap(),0,context_shape);
|
|
HeapFree(GetProcessHeap(),0,context_type);
|
|
}
|