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[kern] Adjust some more 

Getting closer.  So many open questions still...
This commit is contained in:
Behdad Esfahbod 2018-11-06 21:04:40 -05:00
parent 4d003b8503
commit 564e8ac046
1 changed files with 22 additions and 14 deletions
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36
src/hb-ot-kern-table.hh
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@ -266,13 +266,9 @@ struct KernSubTableFormat1
}
hb_mask_t kern_mask = c->plan->kern_mask;
for (unsigned int i = 0; i < depth; i++)
while (depth--)
{
/* Apparently, when spec says "Each pops one glyph from the kerning stack
* and applies the kerning value to it.", it doesn't mean it in that order.
* The deepest item in the stack corresponds to the first item in the action
* list. Discovered by testing. */
unsigned int idx = stack[i];
unsigned int idx = stack[depth];
int v = *actions++;
/* The following two flags are undocumented in the spec, but described
@ -291,29 +287,41 @@ struct KernSubTableFormat1
{
if (crossStream)
{
if (!buffer->pos[idx].y_offset)
buffer->pos[idx].y_offset += c->font->em_scale_y (crossOffset);
/* XXX Why negative, not positive?!?! */
crossOffset -= v;
buffer->pos[idx].y_offset += c->font->em_scale_y (crossOffset);
v = -v;
crossOffset += v;
}
else
{
buffer->pos[idx].x_advance += c->font->em_scale_x (v);
if (last)
if (!buffer->pos[idx].x_offset)
{
buffer->pos[idx].x_advance += c->font->em_scale_x (v);
buffer->pos[idx].x_offset += c->font->em_scale_x (v);
}
}
}
else
{
if (crossStream)
{
crossOffset += v;
buffer->pos[idx].x_offset += c->font->em_scale_x (crossOffset);
/* CoreText doesn't do crossStream kerning in vertical. */
#if 0
if (!buffer->pos[idx].x_offset)
buffer->pos[idx].x_offset = c->font->em_scale_x (crossOffset);
#endif
/* XXX Why negative, not positive?!?! */
v = -v;
crossOffset += v;
}
else
{
buffer->pos[idx].y_advance += c->font->em_scale_y (v);
if (last)
if (!buffer->pos[idx].y_offset)
{
buffer->pos[idx].y_advance += c->font->em_scale_y (v);
buffer->pos[idx].y_offset += c->font->em_scale_y (v);
}
}
}
}