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[layout] If lookup has only one subtable, move the forward loop down to subtable 

I was hoping to see a nice speedup, but it resulted in a very minor one.
This commit is contained in:
Behdad Esfahbod 2015-02-19 17:30:05 +03:00
parent e2f50f2a7e
commit 640b66c634
1 changed files with 32 additions and 1 deletions
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33
src/hb-ot-layout.cc
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@ -873,6 +873,29 @@ apply_backward (OT::hb_apply_context_t *c,
return ret;
}
struct hb_apply_forward_context_t
{
inline const char *get_name (void) { return "APPLY_FORWARD"; }
static const unsigned int max_debug_depth = HB_DEBUG_APPLY;
typedef bool return_t;
template <typename T, typename F>
inline bool may_dispatch (const T *obj, const F *format) { return true; }
template <typename T>
inline return_t dispatch (const T &obj) { return apply_forward (c, obj, accel); }
static return_t default_return_value (void) { return false; }
bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return true; }
hb_apply_forward_context_t (OT::hb_apply_context_t *c_,
const hb_ot_layout_lookup_accelerator_t &accel_) :
c (c_),
accel (accel_),
debug_depth (0) {}
OT::hb_apply_context_t *c;
const hb_ot_layout_lookup_accelerator_t &accel;
unsigned int debug_depth;
};
template <typename Proxy>
static inline void
apply_string (OT::hb_apply_context_t *c,
@ -893,7 +916,15 @@ apply_string (OT::hb_apply_context_t *c,
buffer->clear_output ();
buffer->idx = 0;
if (apply_forward (c, lookup, accel))
bool ret;
if (lookup.get_subtable_count () == 1)
{
hb_apply_forward_context_t c_forward (c, accel);
ret = lookup.dispatch (&c_forward);
}
else
ret = apply_forward (c, lookup, accel);
if (ret)
{
if (!Proxy::inplace)
buffer->swap_buffers ();