fontconfig/src/fcmatch.c

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2002-02-15 00:34:13 +01:00
/*
* $XFree86: $
*
* Copyright <EFBFBD> 2000 Keith Packard, member of The XFree86 Project, Inc.
*
* 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 <string.h>
#include <ctype.h>
#include "fcint.h"
#include <stdio.h>
static double
FcCompareInteger (char *object, FcValue value1, FcValue value2)
{
int v;
if (value2.type != FcTypeInteger || value1.type != FcTypeInteger)
return -1.0;
v = value2.u.i - value1.u.i;
if (v < 0)
v = -v;
return (double) v;
}
static double
FcCompareString (char *object, FcValue value1, FcValue value2)
{
if (value2.type != FcTypeString || value1.type != FcTypeString)
return -1.0;
return (double) FcStrCmpIgnoreCase (value1.u.s, value2.u.s) != 0;
}
static double
FcCompareBool (char *object, FcValue value1, FcValue value2)
{
if (value2.type != FcTypeBool || value1.type != FcTypeBool)
return -1.0;
return (double) value2.u.b != value1.u.b;
}
static double
FcCompareCharSet (char *object, FcValue value1, FcValue value2)
{
if (value2.type != FcTypeCharSet || value1.type != FcTypeCharSet)
return -1.0;
return (double) FcCharSetSubtractCount (value1.u.c, value2.u.c);
}
static double
FcCompareSize (char *object, 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;
}
/*
* Order is significant, it defines the precedence of
* each value, earlier values are more significant than
* later values
*/
static FcMatcher _FcMatchers [] = {
{ FC_FOUNDRY, FcCompareString, },
{ FC_CHARSET, FcCompareCharSet },
{ FC_ANTIALIAS, FcCompareBool, },
{ FC_LANG, FcCompareString },
{ FC_FAMILY, FcCompareString, },
{ FC_SPACING, FcCompareInteger, },
{ FC_PIXEL_SIZE, FcCompareSize, },
{ FC_STYLE, FcCompareString, },
{ FC_SLANT, FcCompareInteger, },
{ FC_WEIGHT, FcCompareInteger, },
{ FC_RASTERIZER, FcCompareString, },
{ FC_OUTLINE, FcCompareBool, },
};
#define NUM_MATCHER (sizeof _FcMatchers / sizeof _FcMatchers[0])
static FcBool
FcCompareValueList (const char *object,
FcValueList *v1orig, /* pattern */
FcValueList *v2orig, /* target */
FcValue *bestValue,
double *value,
FcResult *result)
{
FcValueList *v1, *v2;
double v, best;
int j;
int i;
for (i = 0; i < NUM_MATCHER; i++)
{
if (!FcStrCmpIgnoreCase ((FcChar8 *) _FcMatchers[i].object,
(FcChar8 *) object))
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break;
}
if (i == NUM_MATCHER)
{
if (bestValue)
*bestValue = v2orig->value;
return FcTrue;
}
best = 1e99;
j = 0;
for (v1 = v1orig; v1; v1 = v1->next)
{
for (v2 = v2orig; v2; v2 = v2->next)
{
v = (*_FcMatchers[i].compare) (_FcMatchers[i].object,
v1->value,
v2->value);
if (v < 0)
{
*result = FcResultTypeMismatch;
return FcFalse;
}
if (FcDebug () & FC_DBG_MATCHV)
printf (" v %g j %d ", v, j);
v = v * 100 + j;
if (v < best)
{
if (bestValue)
*bestValue = v2->value;
best = v;
}
}
j++;
}
if (FcDebug () & FC_DBG_MATCHV)
{
printf (" %s: %g ", object, best);
FcValueListPrint (v1orig);
printf (", ");
FcValueListPrint (v2orig);
printf ("\n");
}
value[i] += best;
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_MATCHER; i++)
value[i] = 0.0;
for (i1 = 0; i1 < pat->num; i1++)
{
for (i2 = 0; i2 < fnt->num; i2++)
{
if (!FcStrCmpIgnoreCase ((FcChar8 *) pat->elts[i1].object,
(FcChar8 *) fnt->elts[i2].object))
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{
if (!FcCompareValueList (pat->elts[i1].object,
pat->elts[i1].values,
fnt->elts[i2].values,
0,
value,
result))
return FcFalse;
break;
}
}
#if 0
/*
* Overspecified patterns are slightly penalized in
* case some other font includes the requested field
*/
if (i2 == fnt->num)
{
for (i2 = 0; i2 < NUM_MATCHER; i2++)
{
if (!FcStrCmpIgnoreCase (_FcMatchers[i2].object,
pat->elts[i1].object))
{
value[i2] = 1.0;
break;
}
}
}
#endif
}
return FcTrue;
}
FcPattern *
FcFontMatch (FcConfig *config,
FcPattern *p,
FcResult *result)
{
double score[NUM_MATCHER], bestscore[NUM_MATCHER];
int f;
FcFontSet *s;
FcPattern *best;
FcPattern *new;
FcPatternElt *fe, *pe;
FcValue v;
int i;
FcSetName set;
for (i = 0; i < NUM_MATCHER; 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 = FcSetSystem; set <= FcSetApplication; set++)
{
s = config->fonts[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_MATCHER; i++)
{
printf (" %g", score[i]);
}
printf ("\n");
}
for (i = 0; i < NUM_MATCHER; i++)
{
if (best && bestscore[i] < score[i])
break;
if (!best || score[i] < bestscore[i])
{
for (i = 0; i < NUM_MATCHER; i++)
bestscore[i] = score[i];
best = s->fonts[f];
break;
}
}
}
}
if (FcDebug () & FC_DBG_MATCH)
{
printf ("Best score");
for (i = 0; i < NUM_MATCHER; i++)
printf (" %g", bestscore[i]);
FcPatternPrint (best);
}
if (!best)
{
*result = FcResultNoMatch;
return 0;
}
new = FcPatternCreate ();
if (!new)
return 0;
for (i = 0; i < best->num; i++)
{
fe = &best->elts[i];
pe = FcPatternFind (p, fe->object, FcFalse);
if (pe)
{
if (!FcCompareValueList (pe->object, pe->values,
fe->values, &v, score, result))
{
FcPatternDestroy (new);
return 0;
}
}
else
v = fe->values->value;
FcPatternAdd (new, fe->object, v, FcTrue);
}
for (i = 0; i < p->num; i++)
{
pe = &p->elts[i];
fe = FcPatternFind (best, pe->object, FcFalse);
if (!fe)
FcPatternAdd (new, pe->object, pe->values->value, FcTrue);
}
FcConfigSubstitute (config, new, FcMatchFont);
return new;
}