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[kern] More tweaks 

Solves a mystery or two.  I'm fairly confident this is what CoreText does now.
This commit is contained in:
Behdad Esfahbod 2018-11-06 21:41:28 -05:00
parent 564e8ac046
commit 80a33b9ac3
1 changed files with 23 additions and 19 deletions
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42
src/hb-ot-kern-table.hh
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@ -266,15 +266,27 @@ struct KernSubTableFormat1
}
hb_mask_t kern_mask = c->plan->kern_mask;
while (depth--)
{
unsigned int idx = stack[depth];
int v = *actions++;
/* The following two flags are undocumented in the spec, but described
* in the example. */
bool last = v & 1;
/* "Each pops one glyph from the kerning stack and applies the kerning value to it.
* The end of the list is marked by an odd value... */
unsigned int i;
for (i = 0; i < depth; i++)
if (actions[i] & 1)
{
i++;
break;
}
for (; i; i--)
{
unsigned int idx = stack[depth - i];
int v = actions[i - 1];
/* "The end of the list is marked by an odd value..."
* Ignore it. */
v &= ~1;
/* The following flag is undocumented in the spec, but described
* in the example. */
if (v == 0x8000)
{
crossOffset = 0;
@ -287,11 +299,9 @@ struct KernSubTableFormat1
{
if (crossStream)
{
crossOffset += v;
if (!buffer->pos[idx].y_offset)
buffer->pos[idx].y_offset += c->font->em_scale_y (crossOffset);
/* XXX Why negative, not positive?!?! */
v = -v;
crossOffset += v;
}
else
{
@ -307,13 +317,9 @@ struct KernSubTableFormat1
if (crossStream)
{
/* 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;
//crossOffset += v;
//if (!buffer->pos[idx].x_offset)
// buffer->pos[idx].x_offset = c->font->em_scale_x (crossOffset);
}
else
{
@ -325,8 +331,6 @@ struct KernSubTableFormat1
}
}
}
if (last)
break;
}
depth = 0;
}