104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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* fontconfig/src/fcweight.c
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of the author(s) not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. The authors make no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "fcint.h"
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static const struct {
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int ot;
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int fc;
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} map[] = {
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{ 0, FC_WEIGHT_THIN },
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{ 100, FC_WEIGHT_THIN },
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{ 200, FC_WEIGHT_EXTRALIGHT },
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{ 300, FC_WEIGHT_LIGHT },
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{ 350, FC_WEIGHT_DEMILIGHT },
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{ 380, FC_WEIGHT_BOOK },
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{ 400, FC_WEIGHT_REGULAR },
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{ 500, FC_WEIGHT_MEDIUM },
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{ 600, FC_WEIGHT_DEMIBOLD },
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{ 700, FC_WEIGHT_BOLD },
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{ 800, FC_WEIGHT_EXTRABOLD },
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{ 900, FC_WEIGHT_BLACK },
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{1000, FC_WEIGHT_EXTRABLACK },
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};
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static double lerp(double x, int x1, int x2, int y1, int y2)
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{
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int dx = x2 - x1;
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int dy = y2 - y1;
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assert (dx > 0 && dy >= 0 && x1 <= x && x <= x2);
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return y1 + (x-x1) * dy / dx;
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}
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double
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FcWeightFromOpenTypeDouble (double ot_weight)
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{
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int i;
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if (ot_weight < 0)
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return -1;
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ot_weight = FC_MIN (ot_weight, map[(sizeof (map) / sizeof (map[0])) - 1].ot);
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for (i = 1; ot_weight > map[i].ot; i++)
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;
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if (ot_weight == map[i].ot)
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return map[i].fc;
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/* Interpolate between two items. */
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return lerp (ot_weight, map[i-1].ot, map[i].ot, map[i-1].fc, map[i].fc);
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}
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double
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FcWeightToOpenTypeDouble (double fc_weight)
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{
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int i;
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if (fc_weight < 0 || fc_weight > FC_WEIGHT_EXTRABLACK)
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return -1;
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for (i = 1; fc_weight > map[i].fc; i++)
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;
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if (fc_weight == map[i].fc)
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return map[i].ot;
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/* Interpolate between two items. */
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return lerp (fc_weight, map[i-1].fc, map[i].fc, map[i-1].ot, map[i].ot);
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}
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int
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FcWeightFromOpenType (int ot_weight)
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{
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return FcWeightFromOpenTypeDouble (ot_weight) + .5;
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}
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int
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FcWeightToOpenType (int fc_weight)
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{
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return FcWeightToOpenTypeDouble (fc_weight) + .5;
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}
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#define __fcweight__
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#include "fcaliastail.h"
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#undef __fcweight__
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