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This commit is contained in:
Behdad Esfahbod 2013-02-21 15:23:39 -05:00
parent 2b2a6e8944
commit ba87b8fc89
3 changed files with 46 additions and 37 deletions
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5
src/hb-ot-shape-fallback-private.hh
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@ -41,4 +41,9 @@ HB_INTERNAL void _hb_ot_shape_fallback_position_recategorize_marks (const hb_ot_
hb_buffer_t *buffer);
HB_INTERNAL void _hb_ot_shape_fallback_kern (const hb_ot_shape_plan_t *plan,
hb_font_t *font,
hb_buffer_t *buffer);
#endif /* HB_OT_SHAPE_FALLBACK_PRIVATE_HH */

40
src/hb-ot-shape-fallback.cc
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@ -407,3 +407,43 @@ _hb_ot_shape_fallback_position (const hb_ot_shape_plan_t *plan,
}
position_cluster (plan, font, buffer, start, count);
}
/* Performs old-style TrueType kerning. */
void
_hb_ot_shape_fallback_kern (const hb_ot_shape_plan_t *plan,
hb_font_t *font,
hb_buffer_t *buffer)
{
unsigned int count = buffer->len;
hb_mask_t kern_mask = plan->map.get_1_mask (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction) ?
HB_TAG ('k','e','r','n') : HB_TAG ('v','k','r','n'));
if (unlikely (!count)) return;
bool enabled = buffer->info[0].mask & kern_mask;
for (unsigned int i = 1; i < count; i++)
{
bool next = buffer->info[i].mask & kern_mask;
if (enabled && next)
{
hb_position_t x_kern, y_kern, kern1, kern2;
font->get_glyph_kerning_for_direction (buffer->info[i - 1].codepoint, buffer->info[i].codepoint,
buffer->props.direction,
&x_kern, &y_kern);
kern1 = x_kern >> 1;
kern2 = x_kern - kern1;
buffer->pos[i - 1].x_advance += kern1;
buffer->pos[i].x_advance += kern2;
buffer->pos[i].x_offset += kern2;
kern1 = y_kern >> 1;
kern2 = y_kern - kern1;
buffer->pos[i - 1].y_advance += kern1;
buffer->pos[i].y_advance += kern2;
buffer->pos[i].y_offset += kern2;
}
enabled = next;
}
}

38
src/hb-ot-shape.cc
View File

@ -492,42 +492,6 @@ hb_ot_position_complex (hb_ot_shape_context_t *c)
return ret;
}
static inline void
hb_ot_truetype_kern (hb_ot_shape_context_t *c)
{
unsigned int count = c->buffer->len;
hb_mask_t kern_mask = c->plan->map.get_1_mask (HB_DIRECTION_IS_HORIZONTAL (c->buffer->props.direction) ?
HB_TAG ('k','e','r','n') : HB_TAG ('v','k','r','n'));
if (unlikely (!count)) return;
bool enabled = c->buffer->info[0].mask & kern_mask;
for (unsigned int i = 1; i < count; i++)
{
bool next = c->buffer->info[i].mask & kern_mask;
if (enabled && next)
{
hb_position_t x_kern, y_kern, kern1, kern2;
c->font->get_glyph_kerning_for_direction (c->buffer->info[i - 1].codepoint, c->buffer->info[i].codepoint,
c->buffer->props.direction,
&x_kern, &y_kern);
kern1 = x_kern >> 1;
kern2 = x_kern - kern1;
c->buffer->pos[i - 1].x_advance += kern1;
c->buffer->pos[i].x_advance += kern2;
c->buffer->pos[i].x_offset += kern2;
kern1 = y_kern >> 1;
kern2 = y_kern - kern1;
c->buffer->pos[i - 1].y_advance += kern1;
c->buffer->pos[i].y_advance += kern2;
c->buffer->pos[i].y_offset += kern2;
}
enabled = next;
}
}
static inline void
hb_ot_position (hb_ot_shape_context_t *c)
{
@ -544,7 +508,7 @@ hb_ot_position (hb_ot_shape_context_t *c)
/* Visual fallback goes here. */
if (fallback)
hb_ot_truetype_kern (c);
_hb_ot_shape_fallback_kern (c->plan, c->font, c->buffer);
}