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[Indic] More refactoring of consonant position peeking in the font 

To be moved to initial_reordering next...
This commit is contained in:
Behdad Esfahbod 2012-08-02 07:53:18 -04:00
parent 3eb6f81fd3
commit 8ef3d53255
1 changed files with 41 additions and 18 deletions
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59
src/hb-ot-shape-complex-indic.cc
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@ -123,20 +123,10 @@ struct indic_shape_plan_t
};
static indic_position_t
consonant_position_from_font (hb_codepoint_t u,
const indic_shape_plan_t *indic_plan,
hb_font_t *font)
consonant_position_from_font (const indic_shape_plan_t *indic_plan,
hb_codepoint_t *glyphs, unsigned int glyphs_len,
hb_face_t *face)
{
hb_codepoint_t virama = (u & ~0x007F) | 0x004D;
if ((u & ~0x007F) == 0x0D80) virama = 0x0DCA; /* Sinahla */
if ((u & ~0x007F) == 0x1780) virama = 0x17D2; /* Khmaer */
hb_codepoint_t glyphs[2];
unsigned int virama_pos = indic_plan->is_old_spec ? 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 (indic_plan->pref.would_substitute (glyphs, ARRAY_LENGTH (glyphs), face)) return POS_BELOW_C;
if (indic_plan->blwf.would_substitute (glyphs, ARRAY_LENGTH (glyphs), face)) return POS_BELOW_C;
if (indic_plan->pstf.would_substitute (glyphs, ARRAY_LENGTH (glyphs), face)) return POS_POST_C;
@ -246,6 +236,43 @@ override_features_indic (const hb_ot_complex_shaper_t *shaper,
}
static void
update_consonant_positions (const hb_ot_map_t *map,
hb_buffer_t *buffer,
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;
}
indic_shape_plan_t indic_plan (map);
unsigned int consonant_pos = indic_plan.is_old_spec ? 0 : 1;
hb_codepoint_t glyphs[2];
if (virama && font->get_glyph (virama, 0, &glyphs[1 - consonant_pos]))
{
hb_face_t *face = font->face;
unsigned int count = buffer->len;
for (unsigned int i = 0; i < count; i++)
if (buffer->info[i].indic_position() == POS_BASE_C) {
font->get_glyph (buffer->info[i].codepoint, 0, &glyphs[consonant_pos]);
buffer->info[i].indic_position() = consonant_position_from_font (&indic_plan, glyphs, 2, face);
}
}
}
static void
setup_masks_indic (const hb_ot_complex_shaper_t *shaper,
const hb_ot_map_t *map,
@ -258,15 +285,11 @@ 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. */
indic_shape_plan_t indic_plan (map);
unsigned int count = buffer->len;
for (unsigned int i = 0; i < count; i++)
set_indic_properties (buffer->info[i]);
for (unsigned int i = 0; i < count; i++)
if (buffer->info[i].indic_position() == POS_BASE_C)
buffer->info[i].indic_position() = consonant_position_from_font (buffer->info[i].codepoint, &indic_plan, font);
update_consonant_positions (map, buffer, font);
}
static int