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[Indic] Move more repeated work into shape_plan

This commit is contained in:
Behdad Esfahbod 2012-08-02 11:03:39 -04:00
parent a8c6da90f4
commit 914ffaa40f
1 changed files with 42 additions and 21 deletions
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63
src/hb-ot-shape-complex-indic.cc
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@ -210,12 +210,50 @@ struct indic_shape_plan_t
pref (&plan->map, HB_TAG('p','r','e','f')), pref (&plan->map, HB_TAG('p','r','e','f')),
blwf (&plan->map, HB_TAG('b','l','w','f')), blwf (&plan->map, HB_TAG('b','l','w','f')),
pstf (&plan->map, HB_TAG('p','s','t','f')), pstf (&plan->map, HB_TAG('p','s','t','f')),
is_old_spec (IS_OLD_INDIC_TAG (plan->map.get_chosen_script (0))) {} is_old_spec (IS_OLD_INDIC_TAG (plan->map.get_chosen_script (0))),
virama_glyph ((hb_codepoint_t) -1)
{
switch ((int) plan->props.script) {
case HB_SCRIPT_DEVANAGARI:virama = 0x094D; break;
case HB_SCRIPT_BENGALI: virama = 0x09CD; break;
case HB_SCRIPT_GURMUKHI: virama = 0x0A4D; break;
case HB_SCRIPT_GUJARATI: virama = 0x0ACD; break;
case HB_SCRIPT_ORIYA: virama = 0x0B4D; break;
case HB_SCRIPT_TAMIL: virama = 0x0BCD; break;
case HB_SCRIPT_TELUGU: virama = 0x0C4D; break;
case HB_SCRIPT_KANNADA: virama = 0x0CCD; break;
case HB_SCRIPT_MALAYALAM: virama = 0x0D4D; break;
case HB_SCRIPT_SINHALA: virama = 0x0DCA; break;
case HB_SCRIPT_KHMER: virama = 0x17D2; break;
default: virama = 0; break;
}
}
would_apply_feature_t pref; would_apply_feature_t pref;
would_apply_feature_t blwf; would_apply_feature_t blwf;
would_apply_feature_t pstf; would_apply_feature_t pstf;
bool is_old_spec; bool is_old_spec;
hb_codepoint_t virama;
hb_codepoint_t virama_glyph;
inline bool get_virama_glyph (hb_font_t *font, hb_codepoint_t *pglyph) const
{
hb_codepoint_t glyph = virama_glyph;
if (unlikely (virama_glyph == (hb_codepoint_t) -1))
{
if (!font->get_glyph (virama, 0, &glyph))
glyph = 0;
/* Technically speaking, the spec says we should apply 'locl' to virama too.
* Maybe one day... */
/* Our get_glyph() function needs a font, so we can't get the virama glyph
* during shape planning... Instead, overwrite it here. It's safe. Don't worry! */
(const_cast<indic_shape_plan_t *> (this))->virama_glyph = glyph;
}
*pglyph = glyph;
return glyph != 0;
}
}; };
static void * static void *
@ -282,30 +320,12 @@ update_consonant_positions (const hb_ot_shape_plan_t *plan,
hb_buffer_t *buffer, hb_buffer_t *buffer,
hb_font_t *font) hb_font_t *font)
{ {
hb_codepoint_t virama;
switch ((int) buffer->props.script) {
case HB_SCRIPT_DEVANAGARI: virama = 0x094D; break;
case HB_SCRIPT_BENGALI: virama = 0x09CD; break;
case HB_SCRIPT_GURMUKHI: virama = 0x0A4D; break;
case HB_SCRIPT_GUJARATI: virama = 0x0ACD; break;
case HB_SCRIPT_ORIYA: virama = 0x0B4D; break;
case HB_SCRIPT_TAMIL: virama = 0x0BCD; break;
case HB_SCRIPT_TELUGU: virama = 0x0C4D; break;
case HB_SCRIPT_KANNADA: virama = 0x0CCD; break;
case HB_SCRIPT_MALAYALAM: virama = 0x0D4D; break;
case HB_SCRIPT_SINHALA: virama = 0x0DCA; break;
case HB_SCRIPT_KHMER: virama = 0x17D2; break;
default: virama = 0; break;
}
const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data; const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data;
unsigned int consonant_pos = indic_plan->is_old_spec ? 0 : 1; unsigned int consonant_pos = indic_plan->is_old_spec ? 0 : 1;
hb_codepoint_t glyphs[2]; hb_codepoint_t glyphs[2];
if (virama && font->get_glyph (virama, 0, &glyphs[1 - consonant_pos])) if (indic_plan->get_virama_glyph (font, &glyphs[1 - consonant_pos]))
{ {
/* Technically speaking, the spec says we should apply 'locl' to virama too.
* Maybe one day... */
hb_face_t *face = font->face; hb_face_t *face = font->face;
unsigned int count = buffer->len; unsigned int count = buffer->len;
for (unsigned int i = 0; i < count; i++) for (unsigned int i = 0; i < count; i++)
@ -324,6 +344,7 @@ static void
initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan, hb_buffer_t *buffer, hb_mask_t *basic_mask_array, initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan, hb_buffer_t *buffer, hb_mask_t *basic_mask_array,
unsigned int start, unsigned int end) unsigned int start, unsigned int end)
{ {
const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data;
hb_glyph_info_t *info = buffer->info; hb_glyph_info_t *info = buffer->info;
@ -526,7 +547,7 @@ initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan, hb_buffer
/* For old-style Indic script tags, move the first post-base Halant after /* For old-style Indic script tags, move the first post-base Halant after
* last consonant. */ * last consonant. */
if (IS_OLD_INDIC_TAG (plan->map.get_chosen_script (0))) { if (indic_plan->is_old_spec) {
for (unsigned int i = base + 1; i < end; i++) for (unsigned int i = base + 1; i < end; i++)
if (info[i].indic_category() == OT_H) { if (info[i].indic_category() == OT_H) {
unsigned int j; unsigned int j;