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/* Pango
* pango-ot-ruleset.c: Shaping using OpenType features
*
* Copyright (C) 2000 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include "pango-ot-private.h"
#include "pango-impl-utils.h"
typedef struct _PangoOTRule PangoOTRule;
struct _PangoOTRule
{
gulong property_bit;
FT_UShort feature_index;
guint table_type : 1;
};
static void pango_ot_ruleset_class_init (GObjectClass *object_class);
static void pango_ot_ruleset_init (PangoOTRuleset *ruleset);
static void pango_ot_ruleset_finalize (GObject *object);
static GObjectClass *parent_class;
GType
pango_ot_ruleset_get_type (void)
{
static GType object_type = 0;
if (!object_type)
{
static const GTypeInfo object_info =
{
sizeof (PangoOTRulesetClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc)pango_ot_ruleset_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (PangoOTRuleset),
0, /* n_preallocs */
(GInstanceInitFunc)pango_ot_ruleset_init,
NULL /* value_table */
};
object_type = g_type_register_static (G_TYPE_OBJECT,
I_("PangoOTRuleset"),
&object_info, 0);
}
return object_type;
}
static void
pango_ot_ruleset_class_init (GObjectClass *object_class)
{
parent_class = g_type_class_peek_parent (object_class);
object_class->finalize = pango_ot_ruleset_finalize;
}
static void
pango_ot_ruleset_init (PangoOTRuleset *ruleset)
{
ruleset->rules = g_array_new (FALSE, FALSE, sizeof (PangoOTRule));
}
static void
pango_ot_ruleset_finalize (GObject *object)
{
PangoOTRuleset *ruleset = PANGO_OT_RULESET (object);
g_array_free (ruleset->rules, TRUE);
g_object_unref (ruleset->info);
parent_class->finalize (object);
}
/**
* pango_ot_ruleset_new:
* @info: a #PangoOTInfo.
*
* Creates a new #PangoOTRuleset for the given OpenType info.
*
* Return value: the newly allocated #PangoOTRuleset, which
* should be freed with g_object_unref().
**/
PangoOTRuleset *
pango_ot_ruleset_new (PangoOTInfo *info)
{
PangoOTRuleset *ruleset;
ruleset = g_object_new (PANGO_TYPE_OT_RULESET, NULL);
ruleset->info = g_object_ref (info);
return ruleset;
}
/**
* pango_ot_ruleset_add_feature:
* @ruleset: a #PangoOTRuleset.
* @table_type: the table type to add a feature to.
* @feature_index: the index of the feature to add.
* @property_bit: the property bit to use for this feature. Used to identify
* the glyphs that this feature should be applied to, or
* %PANGO_OT_ALL_GLYPHS if it should be applied to all glyphs.
*
* Adds a feature to the ruleset.
**/
void
pango_ot_ruleset_add_feature (PangoOTRuleset *ruleset,
PangoOTTableType table_type,
guint feature_index,
gulong property_bit)
{
PangoOTRule tmp_rule;
g_return_if_fail (PANGO_OT_IS_RULESET (ruleset));
tmp_rule.table_type = table_type;
tmp_rule.feature_index = feature_index;
tmp_rule.property_bit = property_bit;
g_array_append_val (ruleset->rules, tmp_rule);
}
/**
* pango_ot_ruleset_substitute:
* @ruleset: a #PangoOTRuleset.
* @buffer: a #PangoOTBuffer.
*
* Performs the OpenType GSUB substitution on @buffer using the features
* in @ruleset
*
* Since: 1.4
**/
void
pango_ot_ruleset_substitute (PangoOTRuleset *ruleset,
PangoOTBuffer *buffer)
{
unsigned int i;
HB_GSUB gsub = NULL;
g_return_if_fail (PANGO_OT_IS_RULESET (ruleset));
for (i = 0; i < ruleset->rules->len; i++)
{
PangoOTRule *rule = &g_array_index (ruleset->rules, PangoOTRule, i);
if (rule->table_type != PANGO_OT_TABLE_GSUB)
continue;
if (!gsub)
{
gsub = pango_ot_info_get_gsub (ruleset->info);
if (gsub)
HB_GSUB_Clear_Features (gsub);
else
return;
}
HB_GSUB_Add_Feature (gsub, rule->feature_index, rule->property_bit);
}
HB_GSUB_Apply_String (gsub, buffer->buffer);
}
/**
* pango_ot_ruleset_position:
* @ruleset: a #PangoOTRuleset.
* @buffer: a #PangoOTBuffer.
*
* Performs the OpenType GPOS positionoing on @buffer using the features
* in @ruleset
*
* Since: 1.4
**/
void
pango_ot_ruleset_position (PangoOTRuleset *ruleset,
PangoOTBuffer *buffer)
{
unsigned int i;
HB_GPOS gpos = NULL;
g_return_if_fail (PANGO_OT_IS_RULESET (ruleset));
for (i = 0; i < ruleset->rules->len; i++)
{
PangoOTRule *rule = &g_array_index (ruleset->rules, PangoOTRule, i);
if (rule->table_type != PANGO_OT_TABLE_GPOS)
continue;
if (!gpos)
{
gpos = pango_ot_info_get_gpos (ruleset->info);
if (gpos)
HB_GPOS_Clear_Features (gpos);
else
return;
}
HB_GPOS_Add_Feature (gpos, rule->feature_index, rule->property_bit);
}
if (HB_GPOS_Apply_String (ruleset->info->face, gpos, 0, buffer->buffer,
FALSE /* enable device-dependant values */,
buffer->rtl) == FT_Err_Ok)
buffer->applied_gpos = TRUE;
}
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