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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 void
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);
}
}
static void
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);
}
}
static PangoOTRuleset *
get_gsub_ruleset (FT_Face face)
{
PangoOTInfo *info = pango_ot_info_get (face);
GQuark ruleset_quark = g_quark_from_string ("thai-gsub-ruleset");
PangoOTRuleset *ruleset;
if (!info)
return NULL;
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;
ruleset = pango_ot_ruleset_new (info);
if (pango_ot_info_find_script (info, PANGO_OT_TABLE_GSUB,
thai_tag, &script_index))
{
maybe_add_gsub_feature (ruleset, info, script_index, FT_MAKE_TAG ('c','c','m','p'), 0xFFFF);
maybe_add_gsub_feature (ruleset, info, script_index, FT_MAKE_TAG ('l','i','g','a'), 0xFFFF);
}
g_object_set_qdata_full (G_OBJECT (info), ruleset_quark, ruleset,
(GDestroyNotify)g_object_unref);
}
return ruleset;
}
static PangoOTRuleset *
get_gpos_ruleset (FT_Face face)
{
PangoOTInfo *info = pango_ot_info_get (face);
GQuark ruleset_quark = g_quark_from_string ("thai-gpos-ruleset");
PangoOTRuleset *ruleset;
if (!info)
return NULL;
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;
ruleset = pango_ot_ruleset_new (info);
if (pango_ot_info_find_script (info, PANGO_OT_TABLE_GPOS,
thai_tag, &script_index))
{
maybe_add_gpos_feature (ruleset, info, script_index, FT_MAKE_TAG ('k','e','r','n'), 0xFFFF);
maybe_add_gpos_feature (ruleset, info, script_index, FT_MAKE_TAG ('m','a','r','k'), 0xFFFF);
maybe_add_gpos_feature (ruleset, info, script_index, FT_MAKE_TAG ('m','k','m','k'), 0xFFFF);
}
g_object_set_qdata_full (G_OBJECT (info), ruleset_quark, ruleset,
(GDestroyNotify)g_object_unref);
}
return ruleset;
}
void
thai_ot_shape (PangoFont *font,
PangoGlyphString *glyphs)
{
FT_Face face;
PangoOTRuleset *gsub_ruleset, *gpos_ruleset;
PangoFcFont *fc_font;
g_return_if_fail (font != NULL);
g_return_if_fail (glyphs != NULL);
fc_font = PANGO_FC_FONT (font);
face = pango_fc_font_lock_face (fc_font);
g_assert (face != NULL);
gsub_ruleset = get_gsub_ruleset (face);
gpos_ruleset = get_gpos_ruleset (face);
if (gsub_ruleset != NULL || gpos_ruleset != NULL)
{
gint i;
PangoOTBuffer *buffer;
/* prepare ot buffer */
buffer = pango_ot_buffer_new (fc_font);
for (i = 0; i < glyphs->num_glyphs; i++)
{
pango_ot_buffer_add_glyph (buffer,
glyphs->glyphs[i].glyph,
0,
glyphs->log_clusters[i]);
}
/* do gsub processing */
if (gsub_ruleset != NULL)
pango_ot_ruleset_substitute (gsub_ruleset, buffer);
/* do gpos processing */
if (gpos_ruleset != NULL)
pango_ot_ruleset_position (gpos_ruleset, buffer);
pango_ot_buffer_output (buffer, glyphs);
pango_ot_buffer_destroy (buffer);
}
pango_fc_font_unlock_face (fc_font);
}
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