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/* Pango
* thai-ot.c:
*
* Copyright (C) 2004 Theppitak Karoonboonyanan
* Author: Theppitak Karoonboonyanan <thep@linux.thai.net>
*/
#include <string.h>
#include "thai-ot.h"
static gint
maybe_add_gsub_feature (PangoOTRuleset *ruleset,
PangoOTInfo *info,
guint script_index,
PangoOTTag feature_tag,
gulong property_bit)
{
guint feature_index;
/* 0xffff == default language system */
if (pango_ot_info_find_feature (info, PANGO_OT_TABLE_GSUB,
feature_tag, script_index, 0xffff, &feature_index))
{
pango_ot_ruleset_add_feature (ruleset, PANGO_OT_TABLE_GSUB, feature_index,
property_bit);
return 1;
}
return 0;
}
static gint
maybe_add_gpos_feature (PangoOTRuleset *ruleset,
PangoOTInfo *info,
guint script_index,
PangoOTTag feature_tag,
gulong property_bit)
{
guint feature_index;
if (pango_ot_info_find_feature (info, PANGO_OT_TABLE_GPOS,
feature_tag, script_index, 0xffff, &feature_index))
{
pango_ot_ruleset_add_feature (ruleset, PANGO_OT_TABLE_GPOS, feature_index,
property_bit);
return 1;
}
return 0;
}
PangoOTRuleset *
thai_ot_get_ruleset (PangoFont *font)
{
PangoFcFont *fc_font;
FT_Face face;
PangoOTInfo *info;
PangoOTRuleset *ruleset = NULL;
g_return_val_if_fail (font != NULL, NULL);
fc_font = PANGO_FC_FONT (font);
face = pango_fc_font_lock_face (fc_font);
g_assert (face != NULL);
info = pango_ot_info_get (face);
if (info != NULL)
{
static GQuark ruleset_quark = 0;
if (!ruleset_quark)
ruleset_quark = g_quark_from_string ("thai-ot-ruleset");
ruleset = g_object_get_qdata (G_OBJECT (info), ruleset_quark);
if (!ruleset)
{
PangoOTTag thai_tag = FT_MAKE_TAG ('t', 'h', 'a', 'i');
guint script_index;
gint n = 0;
ruleset = pango_ot_ruleset_new (info);
if (pango_ot_info_find_script (info, PANGO_OT_TABLE_GSUB,
thai_tag, &script_index))
{
n += maybe_add_gsub_feature (ruleset, info, script_index,
FT_MAKE_TAG ('c','c','m','p'),
0xFFFF);
n += maybe_add_gsub_feature (ruleset, info, script_index,
FT_MAKE_TAG ('l','i','g','a'),
0xFFFF);
}
if (pango_ot_info_find_script (info, PANGO_OT_TABLE_GPOS,
thai_tag, &script_index))
{
n += maybe_add_gpos_feature (ruleset, info, script_index,
FT_MAKE_TAG ('k','e','r','n'),
0xFFFF);
n += maybe_add_gpos_feature (ruleset, info, script_index,
FT_MAKE_TAG ('m','a','r','k'),
0xFFFF);
n += maybe_add_gpos_feature (ruleset, info, script_index,
FT_MAKE_TAG ('m','k','m','k'),
0xFFFF);
}
if (n > 0)
g_object_set_qdata_full (G_OBJECT (info), ruleset_quark, ruleset,
(GDestroyNotify)g_object_unref);
else
{
g_object_unref (ruleset);
ruleset = NULL;
}
}
}
pango_fc_font_unlock_face (fc_font);
return ruleset;
}
void
thai_ot_shape (PangoFont *font,
PangoGlyphString *glyphs)
{
PangoOTRuleset *ot_ruleset;
g_return_if_fail (font != NULL);
g_return_if_fail (glyphs != NULL);
ot_ruleset = thai_ot_get_ruleset (font);
if (ot_ruleset != NULL)
{
gint i;
PangoOTBuffer *buffer;
/* prepare ot buffer */
buffer = pango_ot_buffer_new (PANGO_FC_FONT (font));
for (i = 0; i < glyphs->num_glyphs; i++)
{
pango_ot_buffer_add_glyph (buffer,
glyphs->glyphs[i].glyph,
0,
glyphs->log_clusters[i]);
}
pango_ot_ruleset_substitute (ot_ruleset, buffer);
pango_ot_ruleset_position (ot_ruleset, buffer);
pango_ot_buffer_output (buffer, glyphs);
pango_ot_buffer_destroy (buffer);
}
}
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