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[Indic] Streamline feature would_apply() 

Comes with some 10% speedup for Devanagari even!
This commit is contained in:
Behdad Esfahbod 2012-08-02 05:27:46 -04:00
parent 1d002048d5
commit 610e5e8f71
3 changed files with 114 additions and 82 deletions
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101
src/hb-ot-map-private.hh
View File

@ -42,46 +42,6 @@ struct hb_ot_map_t
public:
hb_ot_map_t (void) { memset (this, 0, sizeof (*this)); }
typedef void (*gsub_pause_func_t) (const hb_ot_map_t *map, hb_face_t *face, hb_buffer_t *buffer, void *user_data);
typedef void (*gpos_pause_func_t) (const hb_ot_map_t *map, hb_font_t *font, hb_buffer_t *buffer, void *user_data);
inline hb_mask_t get_global_mask (void) const { return global_mask; }
inline hb_mask_t get_mask (hb_tag_t feature_tag, unsigned int *shift = NULL) const {
const feature_map_t *map = features.bsearch (&feature_tag);
if (shift) *shift = map ? map->shift : 0;
return map ? map->mask : 0;
}
inline hb_mask_t get_1_mask (hb_tag_t feature_tag) const {
const feature_map_t *map = features.bsearch (&feature_tag);
return map ? map->_1_mask : 0;
}
inline hb_mask_t get_feature_index (unsigned int table_index, hb_tag_t feature_tag) const {
const feature_map_t *map = features.bsearch (&feature_tag);
return map ? map->index[table_index] : HB_OT_LAYOUT_NO_FEATURE_INDEX;
}
inline hb_tag_t get_chosen_script (unsigned int table_index) const
{ return chosen_script[table_index]; }
HB_INTERNAL void substitute_closure (hb_face_t *face, hb_set_t *glyphs) const;
HB_INTERNAL void substitute (hb_face_t *face, hb_buffer_t *buffer) const;
HB_INTERNAL void position (hb_font_t *font, hb_buffer_t *buffer) const;
inline void finish (void) {
features.finish ();
lookups[0].finish ();
lookups[1].finish ();
pauses[0].finish ();
pauses[1].finish ();
}
private:
struct feature_map_t {
hb_tag_t tag; /* should be first for our bsearch to work */
unsigned int index[2]; /* GSUB/GPOS */
@ -113,6 +73,67 @@ struct hb_ot_map_t
pause_callback_t callback;
};
hb_ot_map_t (void) { memset (this, 0, sizeof (*this)); }
typedef void (*gsub_pause_func_t) (const hb_ot_map_t *map, hb_face_t *face, hb_buffer_t *buffer, void *user_data);
typedef void (*gpos_pause_func_t) (const hb_ot_map_t *map, hb_font_t *font, hb_buffer_t *buffer, void *user_data);
inline hb_mask_t get_global_mask (void) const { return global_mask; }
inline hb_mask_t get_mask (hb_tag_t feature_tag, unsigned int *shift = NULL) const {
const feature_map_t *map = features.bsearch (&feature_tag);
if (shift) *shift = map ? map->shift : 0;
return map ? map->mask : 0;
}
inline hb_mask_t get_1_mask (hb_tag_t feature_tag) const {
const feature_map_t *map = features.bsearch (&feature_tag);
return map ? map->_1_mask : 0;
}
inline unsigned int get_feature_index (unsigned int table_index, hb_tag_t feature_tag) const {
const feature_map_t *map = features.bsearch (&feature_tag);
return map ? map->index[table_index] : HB_OT_LAYOUT_NO_FEATURE_INDEX;
}
inline unsigned int get_feature_stage (unsigned int table_index, hb_tag_t feature_tag) const {
const feature_map_t *map = features.bsearch (&feature_tag);
return map ? map->stage[table_index] : (unsigned int) -1;
}
inline void get_stage_lookups (unsigned int table_index, unsigned int stage,
const struct lookup_map_t **plookups, unsigned int *lookup_count) const {
if (unlikely (stage == (unsigned int) -1)) {
*plookups = NULL;
*lookup_count = 0;
return;
}
assert (stage <= pauses[table_index].len);
unsigned int start = stage ? pauses[table_index][stage - 1].num_lookups : 0;
unsigned int end = stage < pauses[table_index].len ? pauses[table_index][stage].num_lookups : lookups[table_index].len;
*plookups = &lookups[table_index][start];
*lookup_count = end - start;
}
inline hb_tag_t get_chosen_script (unsigned int table_index) const
{ return chosen_script[table_index]; }
HB_INTERNAL void substitute_closure (hb_face_t *face, hb_set_t *glyphs) const;
HB_INTERNAL void substitute (hb_face_t *face, hb_buffer_t *buffer) const;
HB_INTERNAL void position (hb_font_t *font, hb_buffer_t *buffer) const;
inline void finish (void) {
features.finish ();
lookups[0].finish ();
lookups[1].finish ();
pauses[0].finish ();
pauses[1].finish ();
}
private:
HB_INTERNAL void add_lookups (hb_face_t *face,
unsigned int table_index,
unsigned int feature_index,

4
src/hb-ot-map.cc
View File

@ -89,6 +89,7 @@ void hb_ot_map_t::substitute (hb_face_t *face, hb_buffer_t *buffer) const
buffer->clear_output ();
if (pause->callback.func)
pause->callback.func (this, face, buffer, pause->callback.user_data);
}
@ -106,6 +107,7 @@ void hb_ot_map_t::position (hb_font_t *font, hb_buffer_t *buffer) const
for (; i < pause->num_lookups; i++)
hb_ot_layout_position_lookup_fast (font, buffer, lookups[table_index][i].index, lookups[table_index][i].mask);
if (pause->callback.func)
pause->callback.func (this, font, buffer, pause->callback.user_data);
}
@ -131,14 +133,12 @@ void hb_ot_map_t::substitute_closure (hb_face_t *face,
void hb_ot_map_builder_t::add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func, void *user_data)
{
if (pause_func) {
pause_info_t *p = pauses[table_index].push ();
if (likely (p)) {
p->stage = current_stage[table_index];
p->callback.func = pause_func;
p->callback.user_data = user_data;
}
}
current_stage[table_index]++;
}

73
src/hb-ot-shape-complex-indic.cc
View File

@ -106,38 +106,47 @@ compare_codepoint (const void *pa, const void *pb)
return a < b ? -1 : a == b ? 0 : +1;
}
static bool
would_substitute (hb_codepoint_t *glyphs,
unsigned int glyphs_count,
hb_tag_t feature_tag,
const hb_ot_map_t *map,
hb_face_t *face)
struct consonant_position_closure_t
{
unsigned int lookup_indices[32];
unsigned int offset, len;
struct feature_t
{
feature_t (const hb_ot_map_t *map, hb_tag_t feature_tag)
{
map->get_stage_lookups (0/*GSUB*/,
map->get_feature_stage (0/*GSUB*/, feature_tag),
&lookups, &count);
}
offset = 0;
do {
len = ARRAY_LENGTH (lookup_indices);
hb_ot_layout_feature_get_lookup_indexes (face, HB_OT_TAG_GSUB,
map->get_feature_index (0/*GSUB*/, feature_tag),
offset,
&len,
lookup_indices);
for (unsigned int i = 0; i < len; i++)
if (hb_ot_layout_would_substitute_lookup_fast (face, glyphs, glyphs_count, lookup_indices[i]))
inline bool would_substitute (hb_codepoint_t *glyphs,
unsigned int glyphs_count,
hb_face_t *face) const
{
for (unsigned int i = 0; i < count; i++)
if (hb_ot_layout_would_substitute_lookup_fast (face, glyphs, glyphs_count, lookups[i].index))
return true;
offset += len;
} while (len == ARRAY_LENGTH (lookup_indices));
return false;
}
private:
const hb_ot_map_t::lookup_map_t *lookups;
unsigned int count;
};
consonant_position_closure_t (const hb_ot_map_t *map_) :
map (map_),
pref (map_, HB_TAG('p','r','e','f')),
blwf (map_, HB_TAG('b','l','w','f')),
pstf (map_, HB_TAG('p','s','t','f')) {}
const hb_ot_map_t *map;
feature_t pref;
feature_t blwf;
feature_t pstf;
};
static indic_position_t
consonant_position (hb_codepoint_t u,
const hb_ot_map_t *map,
const consonant_position_closure_t *closure,
hb_font_t *font)
{
if ((u & ~0x007F) == 0x1780)
@ -148,14 +157,14 @@ consonant_position (hb_codepoint_t u,
if ((u & ~0x007F) == 0x1780) virama = 0x17D2; /* Khmaer */
hb_codepoint_t glyphs[2];
unsigned int virama_pos = IS_OLD_INDIC_TAG (map->get_chosen_script (0)) ? 1 : 0;
unsigned int virama_pos = IS_OLD_INDIC_TAG (closure->map->get_chosen_script (0)) ? 1 : 0;
font->get_glyph (virama, 0, &glyphs[virama_pos]);
font->get_glyph (u, 0, &glyphs[1-virama_pos]);
hb_face_t *face = font->face;
if (would_substitute (glyphs, ARRAY_LENGTH (glyphs), HB_TAG('p','r','e','f'), map, face)) return POS_BELOW_C;
if (would_substitute (glyphs, ARRAY_LENGTH (glyphs), HB_TAG('b','l','w','f'), map, face)) return POS_BELOW_C;
if (would_substitute (glyphs, ARRAY_LENGTH (glyphs), HB_TAG('p','s','t','f'), map, face)) return POS_POST_C;
if (closure->pref.would_substitute (glyphs, ARRAY_LENGTH (glyphs), face)) return POS_BELOW_C;
if (closure->blwf.would_substitute (glyphs, ARRAY_LENGTH (glyphs), face)) return POS_BELOW_C;
if (closure->pstf.would_substitute (glyphs, ARRAY_LENGTH (glyphs), face)) return POS_POST_C;
return POS_BASE_C;
}
@ -260,7 +269,7 @@ is_halant_or_coeng (const hb_glyph_info_t &info)
static inline void
set_indic_properties (hb_glyph_info_t &info,
const hb_ot_map_t *map,
const consonant_position_closure_t *closure,
hb_font_t *font)
{
hb_codepoint_t u = info.codepoint;
@ -322,7 +331,7 @@ set_indic_properties (hb_glyph_info_t &info,
if ((FLAG (cat) & CONSONANT_FLAGS))
{
pos = consonant_position (u, map, font);
pos = consonant_position (u, closure, font);
if (is_ra (u))
cat = OT_Ra;
}
@ -462,9 +471,11 @@ setup_masks_indic (const hb_ot_complex_shaper_t *shaper,
/* We cannot setup masks here. We save information about characters
* and setup masks later on in a pause-callback. */
consonant_position_closure_t closure (map);
unsigned int count = buffer->len;
for (unsigned int i = 0; i < count; i++)
set_indic_properties (buffer->info[i], map, font);
set_indic_properties (buffer->info[i], &closure, font);
}
static int