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[GX] Improve weight mapping 

Align the 'wght' axis default value to OS/2 weight value and
adjust accordingly.  This makes both default=1.0 and default=400
models to work.
This commit is contained in:
Behdad Esfahbod 2016-03-08 17:20:41 -08:00
parent d709220d74
commit d05d083e9f
1 changed files with 12 additions and 3 deletions
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15
src/fcfreetype.c
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@ -1252,15 +1252,17 @@ FcFreeTypeQueryFace (const FT_Face face,
for (i = 0; i < master->num_axis; i++)
{
double value = instance->coords[i] / (double) (1 << 16);
double default_value = master->axis[i].def / (double) (1 << 16);
double mult = value / default_value;
//printf ("named-instance, axis %d tag %lx value %g\n", i, master->axis[i].tag, value);
switch (master->axis[i].tag)
{
case FT_MAKE_TAG ('w','g','h','t'):
weight_mult = value;
weight_mult = mult;
break;
case FT_MAKE_TAG ('w','d','t','h'):
width_mult = value;
width_mult = mult;
break;
/* TODO optical size! */
@ -1637,7 +1639,14 @@ FcFreeTypeQueryFace (const FT_Face face,
if (os2 && os2->version != 0xffff)
{
weight = FcWeightFromOpenType ((int) (os2->usWeightClass * weight_mult + .5));
weight = os2->usWeightClass;
if (weight < 10 && weight_mult != 1.0)
{
/* Work around bad values by cleaning them up before
* multiplying by weight_mult. */
weight = FcWeightToOpenType (FcWeightFromOpenType (weight));
}
weight = FcWeightFromOpenType ((int) (weight * weight_mult + .5));
if ((FcDebug() & FC_DBG_SCANV) && weight != -1)
printf ("\tos2 weight class %d multiplier %g maps to weight %d\n",
os2->usWeightClass, weight_mult, weight);