src/fcmatch.c - third_party/fontconfig - Git at Google

 /*
  * $RCSId: xc/lib/fontconfig/src/fcmatch.c,v 1.20 2002/08/31 22:17:32 keithp Exp $
  *
  * Copyright © 2000 Keith Packard
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
  * the above copyright notice appear in all copies and that both that
  * copyright notice and this permission notice appear in supporting
  * documentation, and that the name of Keith Packard not be used in
  * advertising or publicity pertaining to distribution of the software without
  * specific, written prior permission.  Keith Packard makes no
  * representations about the suitability of this software for any purpose.  It
  * is provided "as is" without express or implied warranty.
  *
  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  * PERFORMANCE OF THIS SOFTWARE.
  */

 #include "fcint.h"
 #include <string.h>
 #include <ctype.h>
 #include <stdio.h>

 static double
 FcCompareNumber (FcValue *value1, FcValue *value2)
 {
     double  v1, v2, v;

     switch (value1->type) {
     case FcTypeInteger:
 	v1 = (double) value1->u.i;
 	break;
     case FcTypeDouble:
 	v1 = value1->u.d;
 	break;
     default:
 	return -1.0;
     }
     switch (value2->type) {
     case FcTypeInteger:
 	v2 = (double) value2->u.i;
 	break;
     case FcTypeDouble:
 	v2 = value2->u.d;
 	break;
     default:
 	return -1.0;
     }
     v = v2 - v1;
     if (v < 0)
 	v = -v;
     return v;
 }

 static double
 FcCompareString (FcValue *v1, FcValue *v2)
 {
     return (double) FcStrCmpIgnoreCase (fc_value_string(v1), fc_value_string(v2)) != 0;
 }

 static double
 FcCompareFamily (FcValue *v1, FcValue *v2)
 {
     /* rely on the guarantee in FcPatternAddWithBinding that
      * families are always FcTypeString. */
     const FcChar8* v1_string = fc_value_string(v1);
     const FcChar8* v2_string = fc_value_string(v2);

     if (FcToLower(*v1_string) != FcToLower(*v2_string))
        return 1.0;

     return (double) FcStrCmpIgnoreBlanksAndCase (v1_string, v2_string) != 0;
 }

 static double
 FcCompareLang (FcValue *v1, FcValue *v2)
 {
     FcLangResult    result;
     FcValue value1 = FcValueCanonicalize(v1), value2 = FcValueCanonicalize(v2);

     switch (value1.type) {
     case FcTypeLangSet:
 	switch (value2.type) {
 	case FcTypeLangSet:
 	    result = FcLangSetCompare (value1.u.l, value2.u.l);
 	    break;
 	case FcTypeString:
 	    result = FcLangSetHasLang (value1.u.l,
 				       value2.u.s);
 	    break;
 	default:
 	    return -1.0;
 	}
 	break;
     case FcTypeString:
 	switch (value2.type) {
 	case FcTypeLangSet:
 	    result = FcLangSetHasLang (value2.u.l, value1.u.s);
 	    break;
 	case FcTypeString:
 	    result = FcLangCompare (value1.u.s,
 				    value2.u.s);
 	    break;
 	default:
 	    return -1.0;
 	}
 	break;
     default:
 	return -1.0;
     }
     switch (result) {
     case FcLangEqual:
 	return 0;
     case FcLangDifferentCountry:
 	return 1;
     case FcLangDifferentLang:
     default:
 	return 2;
     }
 }

 static double
 FcCompareBool (FcValue *v1, FcValue *v2)
 {
     if (fc_storage_type(v2) != FcTypeBool || fc_storage_type(v1) != FcTypeBool)
 	return -1.0;
     return (double) v2->u.b != v1->u.b;
 }

 static double
 FcCompareCharSet (FcValue *v1, FcValue *v2)
 {
     return (double) FcCharSetSubtractCount (fc_value_charset(v1), fc_value_charset(v2));
 }

 static double
 FcCompareSize (FcValue *value1, FcValue *value2)
 {
     double  v1, v2, v;

     switch (value1->type) {
     case FcTypeInteger:
 	v1 = value1->u.i;
 	break;
     case FcTypeDouble:
 	v1 = value1->u.d;
 	break;
     default:
 	return -1;
     }
     switch (value2->type) {
     case FcTypeInteger:
 	v2 = value2->u.i;
 	break;
     case FcTypeDouble:
 	v2 = value2->u.d;
 	break;
     default:
 	return -1;
     }
     if (v2 == 0)
 	return 0;
     v = v2 - v1;
     if (v < 0)
 	v = -v;
     return v;
 }

 typedef struct _FcMatcher {
     FcObject	    object;
     double	    (*compare) (FcValue *value1, FcValue *value2);
     int		    strong, weak;
 } FcMatcher;

 /*
  * Order is significant, it defines the precedence of
  * each value, earlier values are more significant than
  * later values
  */
 static FcMatcher _FcMatchers [] = {
     { FC_FOUNDRY_OBJECT,	FcCompareString,	0, 0 },
 #define MATCH_FOUNDRY	    0
 #define MATCH_FOUNDRY_INDEX 0

     { FC_CHARSET_OBJECT,	FcCompareCharSet,	1, 1 },
 #define MATCH_CHARSET	    1
 #define MATCH_CHARSET_INDEX 1

     { FC_FAMILY_OBJECT,    	FcCompareFamily,	2, 4 },
 #define MATCH_FAMILY	    2
 #define MATCH_FAMILY_STRONG_INDEX   2
 #define MATCH_FAMILY_WEAK_INDEX	    4

     { FC_LANG_OBJECT,		FcCompareLang,	3, 3 },
 #define MATCH_LANG	    3
 #define MATCH_LANG_INDEX    3

     { FC_SPACING_OBJECT,	FcCompareNumber,	5, 5 },
 #define MATCH_SPACING	    4
 #define MATCH_SPACING_INDEX 5

     { FC_PIXEL_SIZE_OBJECT,	FcCompareSize,	6, 6 },
 #define MATCH_PIXEL_SIZE    5
 #define MATCH_PIXEL_SIZE_INDEX	6

     { FC_STYLE_OBJECT,		FcCompareString,	7, 7 },
 #define MATCH_STYLE	    6
 #define MATCH_STYLE_INDEX   7

     { FC_SLANT_OBJECT,		FcCompareNumber,	8, 8 },
 #define MATCH_SLANT	    7
 #define MATCH_SLANT_INDEX   8

     { FC_WEIGHT_OBJECT,		FcCompareNumber,	9, 9 },
 #define MATCH_WEIGHT	    8
 #define MATCH_WEIGHT_INDEX  9

     { FC_WIDTH_OBJECT,		FcCompareNumber,	10, 10 },
 #define MATCH_WIDTH	    9
 #define MATCH_WIDTH_INDEX   10

     { FC_DECORATIVE_OBJECT,	FcCompareBool,		11, 11 },
 #define MATCH_DECORATIVE	11
 #define MATCH_DECORATIVE_INDEX	12

     { FC_ANTIALIAS_OBJECT,	FcCompareBool,		12, 12 },

 #define MATCH_ANTIALIAS		    11
 #define MATCH_ANTIALIAS_INDEX	    12

     { FC_RASTERIZER_OBJECT,	FcCompareString,	13, 13 },
 #define MATCH_RASTERIZER	    12
 #define MATCH_RASTERIZER_INDEX	    12

     { FC_OUTLINE_OBJECT,	FcCompareBool,		14, 14 },
 #define MATCH_OUTLINE		    13
 #define MATCH_OUTLINE_INDEX	    14

     { FC_FONTVERSION_OBJECT,	FcCompareNumber,	15, 15 },
 #define MATCH_FONTVERSION	    14
 #define MATCH_FONTVERSION_INDEX	    15
 };

 #define NUM_MATCH_VALUES    16

 static FcMatcher*
 FcObjectToMatcher (FcObject object)
 {
     int 	i;

     i = -1;
     switch (object) {
     case FC_FOUNDRY_OBJECT:
 	i = MATCH_FOUNDRY; break;
     case FC_FONTVERSION_OBJECT:
 	i = MATCH_FONTVERSION; break;
     case FC_FAMILY_OBJECT:
 	i = MATCH_FAMILY; break;
     case FC_CHARSET_OBJECT:
 	i = MATCH_CHARSET; break;
     case FC_ANTIALIAS_OBJECT:
 	i = MATCH_ANTIALIAS; break;
     case FC_LANG_OBJECT:
 	i = MATCH_LANG; break;
     case FC_SPACING_OBJECT:
         i = MATCH_SPACING; break;
     case FC_STYLE_OBJECT:
         i = MATCH_STYLE; break;
     case FC_SLANT_OBJECT:
         i = MATCH_SLANT; break;
     case FC_PIXEL_SIZE_OBJECT:
 	i = MATCH_PIXEL_SIZE; break;
     case FC_WIDTH_OBJECT:
         i = MATCH_WIDTH; break;
     case FC_WEIGHT_OBJECT:
         i = MATCH_WEIGHT; break;
     case FC_RASTERIZER_OBJECT:
 	i = MATCH_RASTERIZER; break;
     case FC_OUTLINE_OBJECT:
 	i = MATCH_OUTLINE; break;
     case FC_DECORATIVE_OBJECT:
 	i = MATCH_DECORATIVE; break;
     }

     if (i < 0)
 	return NULL;

     return _FcMatchers+i;
 }

 static FcBool
 FcCompareValueList (FcObject	 object,
 		    FcValueListPtr v1orig,	/* pattern */
 		    FcValueListPtr v2orig,	/* target */
 		    FcValue	*bestValue,
 		    double	*value,
 		    FcResult	*result)
 {
     FcValueListPtr  v1, v2;
     double    	    v, best, bestStrong, bestWeak;
     int		    j;
     FcMatcher       *match = FcObjectToMatcher(object);

     if (!match)
     {
 	if (bestValue)
 	    *bestValue = FcValueCanonicalize(&v2orig->value);
 	return FcTrue;
     }

     best = 1e99;
     bestStrong = 1e99;
     bestWeak = 1e99;
     j = 0;
     for (v1 = v1orig; v1; v1 = FcValueListNext(v1))
     {
 	for (v2 = v2orig; v2; v2 = FcValueListNext(v2))
 	{
 	    v = (match->compare) (&v1->value, &v2->value);
 	    if (v < 0)
 	    {
 		*result = FcResultTypeMismatch;
 		return FcFalse;
 	    }
 	    v = v * 100 + j;
 	    if (v < best)
 	    {
 		if (bestValue)
 		    *bestValue = FcValueCanonicalize(&v2->value);
 		best = v;
 	    }
 	    if (v1->binding == FcValueBindingStrong)
 	    {
 		if (v < bestStrong)
 		    bestStrong = v;
 	    }
 	    else
 	    {
 		if (v < bestWeak)
 		    bestWeak = v;
 	    }
 	}
 	j++;
     }
     if (FcDebug () & FC_DBG_MATCHV)
     {
 	printf (" %s: %g ", FcObjectName (object), best);
 	FcValueListPrint (v1orig);
 	printf (", ");
 	FcValueListPrint (v2orig);
 	printf ("\n");
     }
     if (value)
     {
 	int weak    = match->weak;
 	int strong  = match->strong;
 	if (weak == strong)
 	    value[strong] += best;
 	else
 	{
 	    value[weak] += bestWeak;
 	    value[strong] += bestStrong;
 	}
     }
     return FcTrue;
 }

 /*
  * Return a value indicating the distance between the two lists of
  * values
  */

 static FcBool
 FcCompare (FcPattern	*pat,
 	   FcPattern	*fnt,
 	   double	*value,
 	   FcResult	*result)
 {
     int		    i, i1, i2;

     for (i = 0; i < NUM_MATCH_VALUES; i++)
 	value[i] = 0.0;

     i1 = 0;
     i2 = 0;
     while (i1 < pat->num && i2 < fnt->num)
     {
 	FcPatternElt *elt_i1 = &FcPatternElts(pat)[i1];
 	FcPatternElt *elt_i2 = &FcPatternElts(fnt)[i2];

 	i = FcObjectCompare(elt_i1->object, elt_i2->object);
 	if (i > 0)
 	    i2++;
 	else if (i < 0)
 	    i1++;
 	else
 	{
 	    if (!FcCompareValueList (elt_i1->object,
 				     FcPatternEltValues(elt_i1),
 				     FcPatternEltValues(elt_i2),
 				     0, value, result))
 		return FcFalse;
 	    i1++;
 	    i2++;
 	}
     }
     return FcTrue;
 }

 FcPattern *
 FcFontRenderPrepare (FcConfig	    *config,
 		     FcPattern	    *pat,
 		     FcPattern	    *font)
 {
     FcPattern	    *new;
     int		    i;
     FcPatternElt    *fe, *pe;
     FcValue	    v;
     FcResult	    result;

     new = FcPatternCreate ();
     if (!new)
 	return 0;
     for (i = 0; i < font->num; i++)
     {
 	fe = &FcPatternElts(font)[i];
 	pe = FcPatternObjectFindElt (pat, fe->object);
 	if (pe)
 	{
 	    if (!FcCompareValueList (pe->object, FcPatternEltValues(pe),
 				     FcPatternEltValues(fe), &v, 0, &result))
 	    {
 		FcPatternDestroy (new);
 		return 0;
 	    }
 	}
 	else
 	    v = FcValueCanonicalize(&FcPatternEltValues (fe)->value);
 	FcPatternObjectAdd (new, fe->object, v, FcFalse);
     }
     for (i = 0; i < pat->num; i++)
     {
 	pe = &FcPatternElts(pat)[i];
 	fe = FcPatternObjectFindElt (font, pe->object);
 	if (!fe)
 	{
 	    v = FcValueCanonicalize(&FcPatternEltValues(pe)->value);
 	    FcPatternObjectAdd (new, pe->object, v, FcTrue);
 	}
     }

     FcConfigSubstituteWithPat (config, new, pat, FcMatchFont);
     return new;
 }

 FcPattern *
 FcFontSetMatch (FcConfig    *config,
 		FcFontSet   **sets,
 		int	    nsets,
 		FcPattern   *p,
 		FcResult    *result)
 {
     double    	    score[NUM_MATCH_VALUES], bestscore[NUM_MATCH_VALUES];
     int		    f;
     FcFontSet	    *s;
     FcPattern	    *best;
     int		    i;
     int		    set;

     for (i = 0; i < NUM_MATCH_VALUES; i++)
 	bestscore[i] = 0;
     best = 0;
     if (FcDebug () & FC_DBG_MATCH)
     {
 	printf ("Match ");
 	FcPatternPrint (p);
     }
     if (!config)
     {
 	config = FcConfigGetCurrent ();
 	if (!config)
 	    return 0;
     }
     for (set = 0; set < nsets; set++)
     {
 	s = sets[set];
 	if (!s)
 	    continue;
 	for (f = 0; f < s->nfont; f++)
 	{
 	    if (FcDebug () & FC_DBG_MATCHV)
 	    {
 		printf ("Font %d ", f);
 		FcPatternPrint (s->fonts[f]);
 	    }
 	    if (!FcCompare (p, s->fonts[f], score, result))
 		return 0;
 	    if (FcDebug () & FC_DBG_MATCHV)
 	    {
 		printf ("Score");
 		for (i = 0; i < NUM_MATCH_VALUES; i++)
 		{
 		    printf (" %g", score[i]);
 		}
 		printf ("\n");
 	    }
 	    for (i = 0; i < NUM_MATCH_VALUES; i++)
 	    {
 		if (best && bestscore[i] < score[i])
 		    break;
 		if (!best || score[i] < bestscore[i])
 		{
 		    for (i = 0; i < NUM_MATCH_VALUES; i++)
 			bestscore[i] = score[i];
 		    best = s->fonts[f];
 		    break;
 		}
 	    }
 	}
     }
     if (FcDebug () & FC_DBG_MATCH)
     {
 	printf ("Best score");
 	for (i = 0; i < NUM_MATCH_VALUES; i++)
 	    printf (" %g", bestscore[i]);
 	FcPatternPrint (best);
     }
     if (!best)
     {
 	*result = FcResultNoMatch;
 	return 0;
     }
     return FcFontRenderPrepare (config, p, best);
 }

 FcPattern *
 FcFontMatch (FcConfig	*config,
 	     FcPattern	*p,
 	     FcResult	*result)
 {
     FcFontSet	*sets[2];
     int		nsets;

     if (!config)
     {
 	config = FcConfigGetCurrent ();
 	if (!config)
 	    return 0;
     }
     nsets = 0;
     if (config->fonts[FcSetSystem])
 	sets[nsets++] = config->fonts[FcSetSystem];
     if (config->fonts[FcSetApplication])
 	sets[nsets++] = config->fonts[FcSetApplication];
     return FcFontSetMatch (config, sets, nsets, p, result);
 }

 typedef struct _FcSortNode {
     FcPattern	*pattern;
     double	score[NUM_MATCH_VALUES];
 } FcSortNode;

 static int
 FcSortCompare (const void *aa, const void *ab)
 {
     FcSortNode  *a = *(FcSortNode **) aa;
     FcSortNode  *b = *(FcSortNode **) ab;
     double	*as = &a->score[0];
     double	*bs = &b->score[0];
     double	ad = 0, bd = 0;
     int         i;

     i = NUM_MATCH_VALUES;
     while (i-- && (ad = *as++) == (bd = *bs++))
 	;
     return ad < bd ? -1 : ad > bd ? 1 : 0;
 }

 static FcBool
 FcSortWalk (FcSortNode **n, int nnode, FcFontSet *fs, FcCharSet **cs, FcBool trim, FcBool build_cs)
 {
     FcCharSet	*ncs;
     FcSortNode	*node;

     while (nnode--)
     {
 	node = *n++;
 	if (FcPatternGetCharSet (node->pattern, FC_CHARSET, 0, &ncs) ==
 	    FcResultMatch)
 	{
 	    /*
 	     * If this font isn't a subset of the previous fonts,
 	     * add it to the list
 	     */
 	    if (!trim || !*cs || !FcCharSetIsSubset (ncs, *cs))
 	    {
                 if (trim || build_cs)
                 {
                     if (*cs)
                     {
                         ncs = FcCharSetUnion (ncs, *cs);
                         if (!ncs)
                             return FcFalse;
                         FcCharSetDestroy (*cs);
                     }
                     else
                         ncs = FcCharSetCopy (ncs);
                     *cs = ncs;
                 }

 		FcPatternReference (node->pattern);
 		if (FcDebug () & FC_DBG_MATCHV)
 		{
 		    printf ("Add ");
 		    FcPatternPrint (node->pattern);
 		}
 		if (!FcFontSetAdd (fs, node->pattern))
 		{
 		    FcPatternDestroy (node->pattern);
 		    return FcFalse;
 		}
 	    }
 	}
     }
     return FcTrue;
 }

 void
 FcFontSetSortDestroy (FcFontSet *fs)
 {
     FcFontSetDestroy (fs);
 }

 FcFontSet *
 FcFontSetSort (FcConfig	    *config,
 	       FcFontSet    **sets,
 	       int	    nsets,
 	       FcPattern    *p,
 	       FcBool	    trim,
 	       FcCharSet    **csp,
 	       FcResult	    *result)
 {
     FcFontSet	    *ret;
     FcFontSet	    *s;
     FcSortNode	    *nodes;
     FcSortNode	    **nodeps, **nodep;
     int		    nnodes;
     FcSortNode	    *new;
     FcCharSet	    *cs;
     int		    set;
     int		    f;
     int		    i;
     int		    nPatternLang;
     FcBool    	    *patternLangSat;
     FcValue	    patternLang;

     if (FcDebug () & FC_DBG_MATCH)
     {
 	printf ("Sort ");
 	FcPatternPrint (p);
     }
     nnodes = 0;
     for (set = 0; set < nsets; set++)
     {
 	s = sets[set];
 	if (!s)
 	    continue;
 	nnodes += s->nfont;
     }
     if (!nnodes)
 	goto bail0;

     for (nPatternLang = 0;
 	 FcPatternGet (p, FC_LANG, nPatternLang, &patternLang) == FcResultMatch;
 	 nPatternLang++)
 	;

     /* freed below */
     nodes = malloc (nnodes * sizeof (FcSortNode) +
 		    nnodes * sizeof (FcSortNode *) +
 		    nPatternLang * sizeof (FcBool));
     if (!nodes)
 	goto bail0;
     nodeps = (FcSortNode **) (nodes + nnodes);
     patternLangSat = (FcBool *) (nodeps + nnodes);

     new = nodes;
     nodep = nodeps;
     for (set = 0; set < nsets; set++)
     {
 	s = sets[set];
 	if (!s)
 	    continue;
 	for (f = 0; f < s->nfont; f++)
 	{
 	    if (FcDebug () & FC_DBG_MATCHV)
 	    {
 		printf ("Font %d ", f);
 		FcPatternPrint (s->fonts[f]);
 	    }
 	    new->pattern = s->fonts[f];
 	    if (!FcCompare (p, new->pattern, new->score, result))
 		goto bail1;
 	    if (FcDebug () & FC_DBG_MATCHV)
 	    {
 		printf ("Score");
 		for (i = 0; i < NUM_MATCH_VALUES; i++)
 		{
 		    printf (" %g", new->score[i]);
 		}
 		printf ("\n");
 	    }
 	    *nodep = new;
 	    new++;
 	    nodep++;
 	}
     }

     nnodes = new - nodes;

     qsort (nodeps, nnodes, sizeof (FcSortNode *),
 	   FcSortCompare);

     for (i = 0; i < nPatternLang; i++)
 	patternLangSat[i] = FcFalse;

     for (f = 0; f < nnodes; f++)
     {
 	FcBool	satisfies = FcFalse;
 	/*
 	 * If this node matches any language, go check
 	 * which ones and satisfy those entries
 	 */
 	if (nodeps[f]->score[MATCH_LANG_INDEX] < 200)
 	{
 	    for (i = 0; i < nPatternLang; i++)
 	    {
 		FcValue	    nodeLang;

 		if (!patternLangSat[i] &&
 		    FcPatternGet (p, FC_LANG, i, &patternLang) == FcResultMatch &&
 		    FcPatternGet (nodeps[f]->pattern, FC_LANG, 0, &nodeLang) == FcResultMatch)
 		{
 		    double  compare = FcCompareLang (&patternLang, &nodeLang);
 		    if (compare >= 0 && compare < 2)
 		    {
 			if (FcDebug () & FC_DBG_MATCHV)
 			{
 			    FcChar8 *family;
 			    FcChar8 *style;

 			    if (FcPatternGetString (nodeps[f]->pattern, FC_FAMILY, 0, &family) == FcResultMatch &&
 				FcPatternGetString (nodeps[f]->pattern, FC_STYLE, 0, &style) == FcResultMatch)
 				printf ("Font %s:%s matches language %d\n", family, style, i);
 			}
 			patternLangSat[i] = FcTrue;
 			satisfies = FcTrue;
 			break;
 		    }
 		}
 	    }
 	}
 	if (!satisfies)
 	    nodeps[f]->score[MATCH_LANG_INDEX] = 1000.0;
     }

     /*
      * Re-sort once the language issues have been settled
      */
     qsort (nodeps, nnodes, sizeof (FcSortNode *),
 	   FcSortCompare);

     ret = FcFontSetCreate ();
     if (!ret)
 	goto bail1;

     cs = 0;

     if (!FcSortWalk (nodeps, nnodes, ret, &cs, trim, (csp!=0)))
 	goto bail2;

     if (csp)
 	*csp = cs;
     else
     {
         if (cs)
             FcCharSetDestroy (cs);
     }

     free (nodes);

     if (FcDebug() & FC_DBG_MATCH)
     {
 	printf ("First font ");
 	FcPatternPrint (ret->fonts[0]);
     }
     return ret;

 bail2:
     if (cs)
 	FcCharSetDestroy (cs);
     FcFontSetDestroy (ret);
 bail1:
     free (nodes);
 bail0:
     return 0;
 }

 FcFontSet *
 FcFontSort (FcConfig	*config,
 	    FcPattern	*p,
 	    FcBool	trim,
 	    FcCharSet	**csp,
 	    FcResult	*result)
 {
     FcFontSet	*sets[2];
     int		nsets;

     if (!config)
     {
 	config = FcConfigGetCurrent ();
 	if (!config)
 	    return 0;
     }
     nsets = 0;
     if (config->fonts[FcSetSystem])
 	sets[nsets++] = config->fonts[FcSetSystem];
     if (config->fonts[FcSetApplication])
 	sets[nsets++] = config->fonts[FcSetApplication];
     return FcFontSetSort (config, sets, nsets, p, trim, csp, result);
 }
	/*
	* $RCSId: xc/lib/fontconfig/src/fcmatch.c,v 1.20 2002/08/31 22:17:32 keithp Exp $
	*
	* Copyright © 2000 Keith Packard
	*
	* Permission to use, copy, modify, distribute, and sell this software and its
	* documentation for any purpose is hereby granted without fee, provided that
	* the above copyright notice appear in all copies and that both that
	* copyright notice and this permission notice appear in supporting
	* documentation, and that the name of Keith Packard not be used in
	* advertising or publicity pertaining to distribution of the software without
	* specific, written prior permission. Keith Packard makes no
	* representations about the suitability of this software for any purpose. It
	* is provided "as is" without express or implied warranty.
	*
	* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
	* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
	* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
	* PERFORMANCE OF THIS SOFTWARE.
	*/

	#include "fcint.h"
	#include <string.h>
	#include <ctype.h>
	#include <stdio.h>

	static double
	FcCompareNumber (FcValue value1, FcValue value2)
	{
	double v1, v2, v;

	switch (value1->type) {
	case FcTypeInteger:
	v1 = (double) value1->u.i;
	break;
	case FcTypeDouble:
	v1 = value1->u.d;
	break;
	default:
	return -1.0;
	}
	switch (value2->type) {
	case FcTypeInteger:
	v2 = (double) value2->u.i;
	break;
	case FcTypeDouble:
	v2 = value2->u.d;
	break;
	default:
	return -1.0;
	}
	v = v2 - v1;
	if (v < 0)
	v = -v;
	return v;
	}

	static double
	FcCompareString (FcValue v1, FcValue v2)
	{
	return (double) FcStrCmpIgnoreCase (fc_value_string(v1), fc_value_string(v2)) != 0;
	}

	static double
	FcCompareFamily (FcValue v1, FcValue v2)
	{
	/* rely on the guarantee in FcPatternAddWithBinding that
	* families are always FcTypeString. */
	const FcChar8* v1_string = fc_value_string(v1);
	const FcChar8* v2_string = fc_value_string(v2);

	if (FcToLower(v1_string) != FcToLower(v2_string))
	return 1.0;

	return (double) FcStrCmpIgnoreBlanksAndCase (v1_string, v2_string) != 0;
	}

	static double
	FcCompareLang (FcValue v1, FcValue v2)
	{
	FcLangResult result;
	FcValue value1 = FcValueCanonicalize(v1), value2 = FcValueCanonicalize(v2);

	switch (value1.type) {
	case FcTypeLangSet:
	switch (value2.type) {
	case FcTypeLangSet:
	result = FcLangSetCompare (value1.u.l, value2.u.l);
	break;
	case FcTypeString:
	result = FcLangSetHasLang (value1.u.l,
	value2.u.s);
	break;
	default:
	return -1.0;
	}
	break;
	case FcTypeString:
	switch (value2.type) {
	case FcTypeLangSet:
	result = FcLangSetHasLang (value2.u.l, value1.u.s);
	break;
	case FcTypeString:
	result = FcLangCompare (value1.u.s,
	value2.u.s);
	break;
	default:
	return -1.0;
	}
	break;
	default:
	return -1.0;
	}
	switch (result) {
	case FcLangEqual:
	return 0;
	case FcLangDifferentCountry:
	return 1;
	case FcLangDifferentLang:
	default:
	return 2;
	}
	}

	static double
	FcCompareBool (FcValue v1, FcValue v2)
	{
	if (fc_storage_type(v2) != FcTypeBool \|\| fc_storage_type(v1) != FcTypeBool)
	return -1.0;
	return (double) v2->u.b != v1->u.b;
	}

	static double
	FcCompareCharSet (FcValue v1, FcValue v2)
	{
	return (double) FcCharSetSubtractCount (fc_value_charset(v1), fc_value_charset(v2));
	}

	static double
	FcCompareSize (FcValue value1, FcValue value2)
	{
	double v1, v2, v;

	switch (value1->type) {
	case FcTypeInteger:
	v1 = value1->u.i;
	break;
	case FcTypeDouble:
	v1 = value1->u.d;
	break;
	default:
	return -1;
	}
	switch (value2->type) {
	case FcTypeInteger:
	v2 = value2->u.i;
	break;
	case FcTypeDouble:
	v2 = value2->u.d;
	break;
	default:
	return -1;
	}
	if (v2 == 0)
	return 0;
	v = v2 - v1;
	if (v < 0)
	v = -v;
	return v;
	}

	typedef struct _FcMatcher {
	FcObject object;
	double (compare) (FcValue value1, FcValue *value2);
	int strong, weak;
	} FcMatcher;

	/*
	* Order is significant, it defines the precedence of
	* each value, earlier values are more significant than
	* later values
	*/
	static FcMatcher _FcMatchers [] = {
	{ FC_FOUNDRY_OBJECT, FcCompareString, 0, 0 },
	#define MATCH_FOUNDRY 0
	#define MATCH_FOUNDRY_INDEX 0

	{ FC_CHARSET_OBJECT, FcCompareCharSet, 1, 1 },
	#define MATCH_CHARSET 1
	#define MATCH_CHARSET_INDEX 1

	{ FC_FAMILY_OBJECT, FcCompareFamily, 2, 4 },
	#define MATCH_FAMILY 2
	#define MATCH_FAMILY_STRONG_INDEX 2
	#define MATCH_FAMILY_WEAK_INDEX 4

	{ FC_LANG_OBJECT, FcCompareLang, 3, 3 },
	#define MATCH_LANG 3
	#define MATCH_LANG_INDEX 3

	{ FC_SPACING_OBJECT, FcCompareNumber, 5, 5 },
	#define MATCH_SPACING 4
	#define MATCH_SPACING_INDEX 5

	{ FC_PIXEL_SIZE_OBJECT, FcCompareSize, 6, 6 },
	#define MATCH_PIXEL_SIZE 5
	#define MATCH_PIXEL_SIZE_INDEX 6

	{ FC_STYLE_OBJECT, FcCompareString, 7, 7 },
	#define MATCH_STYLE 6
	#define MATCH_STYLE_INDEX 7

	{ FC_SLANT_OBJECT, FcCompareNumber, 8, 8 },
	#define MATCH_SLANT 7
	#define MATCH_SLANT_INDEX 8

	{ FC_WEIGHT_OBJECT, FcCompareNumber, 9, 9 },
	#define MATCH_WEIGHT 8
	#define MATCH_WEIGHT_INDEX 9

	{ FC_WIDTH_OBJECT, FcCompareNumber, 10, 10 },
	#define MATCH_WIDTH 9
	#define MATCH_WIDTH_INDEX 10

	{ FC_DECORATIVE_OBJECT, FcCompareBool, 11, 11 },
	#define MATCH_DECORATIVE 11
	#define MATCH_DECORATIVE_INDEX 12

	{ FC_ANTIALIAS_OBJECT, FcCompareBool, 12, 12 },

	#define MATCH_ANTIALIAS 11
	#define MATCH_ANTIALIAS_INDEX 12

	{ FC_RASTERIZER_OBJECT, FcCompareString, 13, 13 },
	#define MATCH_RASTERIZER 12
	#define MATCH_RASTERIZER_INDEX 12

	{ FC_OUTLINE_OBJECT, FcCompareBool, 14, 14 },
	#define MATCH_OUTLINE 13
	#define MATCH_OUTLINE_INDEX 14

	{ FC_FONTVERSION_OBJECT, FcCompareNumber, 15, 15 },
	#define MATCH_FONTVERSION 14
	#define MATCH_FONTVERSION_INDEX 15
	};

	#define NUM_MATCH_VALUES 16

	static FcMatcher*
	FcObjectToMatcher (FcObject object)
	{
	int i;

	i = -1;
	switch (object) {
	case FC_FOUNDRY_OBJECT:
	i = MATCH_FOUNDRY; break;
	case FC_FONTVERSION_OBJECT:
	i = MATCH_FONTVERSION; break;
	case FC_FAMILY_OBJECT:
	i = MATCH_FAMILY; break;
	case FC_CHARSET_OBJECT:
	i = MATCH_CHARSET; break;
	case FC_ANTIALIAS_OBJECT:
	i = MATCH_ANTIALIAS; break;
	case FC_LANG_OBJECT:
	i = MATCH_LANG; break;
	case FC_SPACING_OBJECT:
	i = MATCH_SPACING; break;
	case FC_STYLE_OBJECT:
	i = MATCH_STYLE; break;
	case FC_SLANT_OBJECT:
	i = MATCH_SLANT; break;
	case FC_PIXEL_SIZE_OBJECT:
	i = MATCH_PIXEL_SIZE; break;
	case FC_WIDTH_OBJECT:
	i = MATCH_WIDTH; break;
	case FC_WEIGHT_OBJECT:
	i = MATCH_WEIGHT; break;
	case FC_RASTERIZER_OBJECT:
	i = MATCH_RASTERIZER; break;
	case FC_OUTLINE_OBJECT:
	i = MATCH_OUTLINE; break;
	case FC_DECORATIVE_OBJECT:
	i = MATCH_DECORATIVE; break;
	}

	if (i < 0)
	return NULL;

	return _FcMatchers+i;
	}

	static FcBool
	FcCompareValueList (FcObject object,
	FcValueListPtr v1orig, /* pattern */
	FcValueListPtr v2orig, /* target */
	FcValue *bestValue,
	double *value,
	FcResult *result)
	{
	FcValueListPtr v1, v2;
	double v, best, bestStrong, bestWeak;
	int j;
	FcMatcher *match = FcObjectToMatcher(object);

	if (!match)
	{
	if (bestValue)
	*bestValue = FcValueCanonicalize(&v2orig->value);
	return FcTrue;
	}

	best = 1e99;
	bestStrong = 1e99;
	bestWeak = 1e99;
	j = 0;
	for (v1 = v1orig; v1; v1 = FcValueListNext(v1))
	{
	for (v2 = v2orig; v2; v2 = FcValueListNext(v2))
	{
	v = (match->compare) (&v1->value, &v2->value);
	if (v < 0)
	{
	*result = FcResultTypeMismatch;
	return FcFalse;
	}
	v = v * 100 + j;
	if (v < best)
	{
	if (bestValue)
	*bestValue = FcValueCanonicalize(&v2->value);
	best = v;
	}
	if (v1->binding == FcValueBindingStrong)
	{
	if (v < bestStrong)
	bestStrong = v;
	}
	else
	{
	if (v < bestWeak)
	bestWeak = v;
	}
	}
	j++;
	}
	if (FcDebug () & FC_DBG_MATCHV)
	{
	printf (" %s: %g ", FcObjectName (object), best);
	FcValueListPrint (v1orig);
	printf (", ");
	FcValueListPrint (v2orig);
	printf ("\n");
	}
	if (value)
	{
	int weak = match->weak;
	int strong = match->strong;
	if (weak == strong)
	value[strong] += best;
	else
	{
	value[weak] += bestWeak;
	value[strong] += bestStrong;
	}
	}
	return FcTrue;
	}

	/*
	* Return a value indicating the distance between the two lists of
	* values
	*/

	static FcBool
	FcCompare (FcPattern *pat,
	FcPattern *fnt,
	double *value,
	FcResult *result)
	{
	int i, i1, i2;

	for (i = 0; i < NUM_MATCH_VALUES; i++)
	value[i] = 0.0;

	i1 = 0;
	i2 = 0;
	while (i1 < pat->num && i2 < fnt->num)
	{
	FcPatternElt *elt_i1 = &FcPatternElts(pat)[i1];
	FcPatternElt *elt_i2 = &FcPatternElts(fnt)[i2];

	i = FcObjectCompare(elt_i1->object, elt_i2->object);
	if (i > 0)
	i2++;
	else if (i < 0)
	i1++;
	else
	{
	if (!FcCompareValueList (elt_i1->object,
	FcPatternEltValues(elt_i1),
	FcPatternEltValues(elt_i2),
	0, value, result))
	return FcFalse;
	i1++;
	i2++;
	}
	}
	return FcTrue;
	}

	FcPattern *
	FcFontRenderPrepare (FcConfig *config,
	FcPattern *pat,
	FcPattern *font)
	{
	FcPattern *new;
	int i;
	FcPatternElt fe, pe;
	FcValue v;
	FcResult result;

	new = FcPatternCreate ();
	if (!new)
	return 0;
	for (i = 0; i < font->num; i++)
	{
	fe = &FcPatternElts(font)[i];
	pe = FcPatternObjectFindElt (pat, fe->object);
	if (pe)
	{
	if (!FcCompareValueList (pe->object, FcPatternEltValues(pe),
	FcPatternEltValues(fe), &v, 0, &result))
	{
	FcPatternDestroy (new);
	return 0;
	}
	}
	else
	v = FcValueCanonicalize(&FcPatternEltValues (fe)->value);
	FcPatternObjectAdd (new, fe->object, v, FcFalse);
	}
	for (i = 0; i < pat->num; i++)
	{
	pe = &FcPatternElts(pat)[i];
	fe = FcPatternObjectFindElt (font, pe->object);
	if (!fe)
	{
	v = FcValueCanonicalize(&FcPatternEltValues(pe)->value);
	FcPatternObjectAdd (new, pe->object, v, FcTrue);
	}
	}

	FcConfigSubstituteWithPat (config, new, pat, FcMatchFont);
	return new;
	}

	FcPattern *
	FcFontSetMatch (FcConfig *config,
	FcFontSet **sets,
	int nsets,
	FcPattern *p,
	FcResult *result)
	{
	double score[NUM_MATCH_VALUES], bestscore[NUM_MATCH_VALUES];
	int f;
	FcFontSet *s;
	FcPattern *best;
	int i;
	int set;

	for (i = 0; i < NUM_MATCH_VALUES; i++)
	bestscore[i] = 0;
	best = 0;
	if (FcDebug () & FC_DBG_MATCH)
	{
	printf ("Match ");
	FcPatternPrint (p);
	}
	if (!config)
	{
	config = FcConfigGetCurrent ();
	if (!config)
	return 0;
	}
	for (set = 0; set < nsets; set++)
	{
	s = sets[set];
	if (!s)
	continue;
	for (f = 0; f < s->nfont; f++)
	{
	if (FcDebug () & FC_DBG_MATCHV)
	{
	printf ("Font %d ", f);
	FcPatternPrint (s->fonts[f]);
	}
	if (!FcCompare (p, s->fonts[f], score, result))
	return 0;
	if (FcDebug () & FC_DBG_MATCHV)
	{
	printf ("Score");
	for (i = 0; i < NUM_MATCH_VALUES; i++)
	{
	printf (" %g", score[i]);
	}
	printf ("\n");
	}
	for (i = 0; i < NUM_MATCH_VALUES; i++)
	{
	if (best && bestscore[i] < score[i])
	break;
	if (!best \|\| score[i] < bestscore[i])
	{
	for (i = 0; i < NUM_MATCH_VALUES; i++)
	bestscore[i] = score[i];
	best = s->fonts[f];
	break;
	}
	}
	}
	}
	if (FcDebug () & FC_DBG_MATCH)
	{
	printf ("Best score");
	for (i = 0; i < NUM_MATCH_VALUES; i++)
	printf (" %g", bestscore[i]);
	FcPatternPrint (best);
	}
	if (!best)
	{
	*result = FcResultNoMatch;
	return 0;
	}
	return FcFontRenderPrepare (config, p, best);
	}

	FcPattern *
	FcFontMatch (FcConfig *config,
	FcPattern *p,
	FcResult *result)
	{
	FcFontSet *sets[2];
	int nsets;

	if (!config)
	{
	config = FcConfigGetCurrent ();
	if (!config)
	return 0;
	}
	nsets = 0;
	if (config->fonts[FcSetSystem])
	sets[nsets++] = config->fonts[FcSetSystem];
	if (config->fonts[FcSetApplication])
	sets[nsets++] = config->fonts[FcSetApplication];
	return FcFontSetMatch (config, sets, nsets, p, result);
	}

	typedef struct _FcSortNode {
	FcPattern *pattern;
	double score[NUM_MATCH_VALUES];
	} FcSortNode;

	static int
	FcSortCompare (const void aa, const void ab)
	{
	FcSortNode a = (FcSortNode **) aa;
	FcSortNode b = (FcSortNode **) ab;
	double *as = &a->score[0];
	double *bs = &b->score[0];
	double ad = 0, bd = 0;
	int i;

	i = NUM_MATCH_VALUES;
	while (i-- && (ad = as++) == (bd = bs++))
	;
	return ad < bd ? -1 : ad > bd ? 1 : 0;
	}

	static FcBool
	FcSortWalk (FcSortNode *n, int nnode, FcFontSet fs, FcCharSet **cs, FcBool trim, FcBool build_cs)
	{
	FcCharSet *ncs;
	FcSortNode *node;

	while (nnode--)
	{
	node = *n++;
	if (FcPatternGetCharSet (node->pattern, FC_CHARSET, 0, &ncs) ==
	FcResultMatch)
	{
	/*
	* If this font isn't a subset of the previous fonts,
	* add it to the list
	*/
	if (!trim \|\| !cs \|\| !FcCharSetIsSubset (ncs, cs))
	{
	if (trim \|\| build_cs)
	{
	if (*cs)
	{
	ncs = FcCharSetUnion (ncs, *cs);
	if (!ncs)
	return FcFalse;
	FcCharSetDestroy (*cs);
	}
	else
	ncs = FcCharSetCopy (ncs);
	*cs = ncs;
	}

	FcPatternReference (node->pattern);
	if (FcDebug () & FC_DBG_MATCHV)
	{
	printf ("Add ");
	FcPatternPrint (node->pattern);
	}
	if (!FcFontSetAdd (fs, node->pattern))
	{
	FcPatternDestroy (node->pattern);
	return FcFalse;
	}
	}
	}
	}
	return FcTrue;
	}

	void
	FcFontSetSortDestroy (FcFontSet *fs)
	{
	FcFontSetDestroy (fs);
	}

	FcFontSet *
	FcFontSetSort (FcConfig *config,
	FcFontSet **sets,
	int nsets,
	FcPattern *p,
	FcBool trim,
	FcCharSet **csp,
	FcResult *result)
	{
	FcFontSet *ret;
	FcFontSet *s;
	FcSortNode *nodes;
	FcSortNode nodeps, nodep;
	int nnodes;
	FcSortNode *new;
	FcCharSet *cs;
	int set;
	int f;
	int i;
	int nPatternLang;
	FcBool *patternLangSat;
	FcValue patternLang;

	if (FcDebug () & FC_DBG_MATCH)
	{
	printf ("Sort ");
	FcPatternPrint (p);
	}
	nnodes = 0;
	for (set = 0; set < nsets; set++)
	{
	s = sets[set];
	if (!s)
	continue;
	nnodes += s->nfont;
	}
	if (!nnodes)
	goto bail0;

	for (nPatternLang = 0;
	FcPatternGet (p, FC_LANG, nPatternLang, &patternLang) == FcResultMatch;
	nPatternLang++)
	;

	/* freed below */
	nodes = malloc (nnodes * sizeof (FcSortNode) +
	nnodes * sizeof (FcSortNode *) +
	nPatternLang * sizeof (FcBool));
	if (!nodes)
	goto bail0;
	nodeps = (FcSortNode **) (nodes + nnodes);
	patternLangSat = (FcBool *) (nodeps + nnodes);

	new = nodes;
	nodep = nodeps;
	for (set = 0; set < nsets; set++)
	{
	s = sets[set];
	if (!s)
	continue;
	for (f = 0; f < s->nfont; f++)
	{
	if (FcDebug () & FC_DBG_MATCHV)
	{
	printf ("Font %d ", f);
	FcPatternPrint (s->fonts[f]);
	}
	new->pattern = s->fonts[f];
	if (!FcCompare (p, new->pattern, new->score, result))
	goto bail1;
	if (FcDebug () & FC_DBG_MATCHV)
	{
	printf ("Score");
	for (i = 0; i < NUM_MATCH_VALUES; i++)
	{
	printf (" %g", new->score[i]);
	}
	printf ("\n");
	}
	*nodep = new;
	new++;
	nodep++;
	}
	}

	nnodes = new - nodes;

	qsort (nodeps, nnodes, sizeof (FcSortNode *),
	FcSortCompare);

	for (i = 0; i < nPatternLang; i++)
	patternLangSat[i] = FcFalse;

	for (f = 0; f < nnodes; f++)
	{
	FcBool satisfies = FcFalse;
	/*
	* If this node matches any language, go check
	* which ones and satisfy those entries
	*/
	if (nodeps[f]->score[MATCH_LANG_INDEX] < 200)
	{
	for (i = 0; i < nPatternLang; i++)
	{
	FcValue nodeLang;

	if (!patternLangSat[i] &&
	FcPatternGet (p, FC_LANG, i, &patternLang) == FcResultMatch &&
	FcPatternGet (nodeps[f]->pattern, FC_LANG, 0, &nodeLang) == FcResultMatch)
	{
	double compare = FcCompareLang (&patternLang, &nodeLang);
	if (compare >= 0 && compare < 2)
	{
	if (FcDebug () & FC_DBG_MATCHV)
	{
	FcChar8 *family;
	FcChar8 *style;

	if (FcPatternGetString (nodeps[f]->pattern, FC_FAMILY, 0, &family) == FcResultMatch &&
	FcPatternGetString (nodeps[f]->pattern, FC_STYLE, 0, &style) == FcResultMatch)
	printf ("Font %s:%s matches language %d\n", family, style, i);
	}
	patternLangSat[i] = FcTrue;
	satisfies = FcTrue;
	break;
	}
	}
	}
	}
	if (!satisfies)
	nodeps[f]->score[MATCH_LANG_INDEX] = 1000.0;
	}

	/*
	* Re-sort once the language issues have been settled
	*/
	qsort (nodeps, nnodes, sizeof (FcSortNode *),
	FcSortCompare);

	ret = FcFontSetCreate ();
	if (!ret)
	goto bail1;

	cs = 0;

	if (!FcSortWalk (nodeps, nnodes, ret, &cs, trim, (csp!=0)))
	goto bail2;

	if (csp)
	*csp = cs;
	else
	{
	if (cs)
	FcCharSetDestroy (cs);
	}

	free (nodes);

	if (FcDebug() & FC_DBG_MATCH)
	{
	printf ("First font ");
	FcPatternPrint (ret->fonts[0]);
	}
	return ret;

	bail2:
	if (cs)
	FcCharSetDestroy (cs);
	FcFontSetDestroy (ret);
	bail1:
	free (nodes);
	bail0:
	return 0;
	}

	FcFontSet *
	FcFontSort (FcConfig *config,
	FcPattern *p,
	FcBool trim,
	FcCharSet **csp,
	FcResult *result)
	{
	FcFontSet *sets[2];
	int nsets;

	if (!config)
	{
	config = FcConfigGetCurrent ();
	if (!config)
	return 0;
	}
	nsets = 0;
	if (config->fonts[FcSetSystem])
	sets[nsets++] = config->fonts[FcSetSystem];
	if (config->fonts[FcSetApplication])
	sets[nsets++] = config->fonts[FcSetApplication];
	return FcFontSetSort (config, sets, nsets, p, trim, csp, result);
	}