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[layout] Add apply_forward / apply_backward

This commit is contained in:
Behdad Esfahbod 2015-02-19 17:15:05 +03:00
parent 1d4a328472
commit e2f50f2a7e
1 changed files with 46 additions and 23 deletions
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69
src/hb-ot-layout.cc
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@ -829,6 +829,50 @@ struct GPOSProxy
};
template <typename Obj>
static inline bool
apply_forward (OT::hb_apply_context_t *c,
const Obj &obj,
const hb_ot_layout_lookup_accelerator_t &accel)
{
bool ret = false;
hb_buffer_t *buffer = c->buffer;
while (buffer->idx < buffer->len)
{
if (accel.may_have (buffer->cur().codepoint) &&
(buffer->cur().mask & c->lookup_mask) &&
c->check_glyph_property (&c->buffer->cur(), c->lookup_props) &&
obj.apply (c))
ret = true;
else
buffer->next_glyph ();
}
return ret;
}
template <typename Obj>
static inline bool
apply_backward (OT::hb_apply_context_t *c,
const Obj &obj,
const hb_ot_layout_lookup_accelerator_t &accel)
{
bool ret = false;
hb_buffer_t *buffer = c->buffer;
do
{
if (accel.may_have (buffer->cur().codepoint) &&
(buffer->cur().mask & c->lookup_mask) &&
c->check_glyph_property (&c->buffer->cur(), c->lookup_props) &&
obj.apply (c))
ret = true;
/* The reverse lookup doesn't "advance" cursor (for good reason). */
buffer->idx--;
}
while ((int) buffer->idx >= 0);
return ret;
}
template <typename Proxy>
static inline void
apply_string (OT::hb_apply_context_t *c,
@ -849,18 +893,7 @@ apply_string (OT::hb_apply_context_t *c,
buffer->clear_output ();
buffer->idx = 0;
bool ret = false;
while (buffer->idx < buffer->len)
{
if (accel.may_have (buffer->cur().codepoint) &&
(buffer->cur().mask & c->lookup_mask) &&
c->check_glyph_property (&c->buffer->cur(), c->lookup_props) &&
lookup.apply (c))
ret = true;
else
buffer->next_glyph ();
}
if (ret)
if (apply_forward (c, lookup, accel))
{
if (!Proxy::inplace)
buffer->swap_buffers ();
@ -874,18 +907,8 @@ apply_string (OT::hb_apply_context_t *c,
if (Proxy::table_index == 0)
buffer->remove_output ();
buffer->idx = buffer->len - 1;
do
{
if (accel.may_have (buffer->cur().codepoint) &&
(buffer->cur().mask & c->lookup_mask) &&
c->check_glyph_property (&c->buffer->cur(), c->lookup_props) &&
lookup.apply (c))
/* nothing */;
/* The reverse lookup doesn't "advance" cursor (for good reason). */
buffer->idx--;
}
while ((int) buffer->idx >= 0);
apply_backward (c, lookup, accel);
}
}