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/* Pango
* pango-impl-utils.h: Macros for get_type() functions
* Inspired by Jody Goldberg's gsf-impl-utils.h
*
* Copyright (C) 2003 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.
*/
#ifndef __PANGO_IMPL_UTILS_H__
#define __PANGO_IMPL_UTILS_H__
#include <glib.h>
#include <glib-object.h>
#include <pango/pango.h>
G_BEGIN_DECLS
#define PANGO_DEFINE_TYPE_FULL(name, prefix, \
class_init, instance_init, \
parent_type, abstract) \
GType \
prefix ## _get_type (void) \
{ \
static GType object_type = 0; \
\
if (!object_type) \
{ \
static const GTypeInfo object_info = \
{ \
sizeof (name ## Class), \
(GBaseInitFunc) NULL, \
(GBaseFinalizeFunc) NULL, \
(GClassInitFunc) class_init, \
(GClassFinalizeFunc) NULL, \
NULL, /* class_data */ \
sizeof (name), \
0, /* n_prelocs */ \
(GInstanceInitFunc) instance_init, \
NULL /* value_table */ \
}; \
\
object_type = g_type_register_static (parent_type, \
g_intern_static_string (# name), \
&object_info, abstract); \
} \
\
return object_type; \
}
#define PANGO_DEFINE_TYPE(name, prefix, \
class_init, instance_init, \
parent_type) \
PANGO_DEFINE_TYPE_FULL (name, prefix, \
class_init, instance_init, \
parent_type, 0)
#define PANGO_DEFINE_TYPE_ABSTRACT(name, prefix, \
class_init, instance_init, \
parent_type) \
PANGO_DEFINE_TYPE_FULL (name, prefix, \
class_init, instance_init, \
parent_type, G_TYPE_FLAG_ABSTRACT)
/* String interning for static strings */
#define I_(string) g_intern_static_string (string)
/* Some functions for handling PANGO_ATTR_SHAPE */
void _pango_shape_shape (const char *text,
gint n_chars,
PangoRectangle *shape_ink,
PangoRectangle *shape_logical,
PangoGlyphString *glyphs);
void _pango_shape_get_extents (gint n_chars,
PangoRectangle *shape_ink,
PangoRectangle *shape_logical,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect);
/* We define these functions static here because we don't want to add public API
* for them (if anything, it belongs to glib, but glib found it trivial enough
* not to add API for). At some point metrics calculations will be
* centralized and this mess can be minimized. Or so I hope.
*/
static inline G_GNUC_UNUSED int
pango_unichar_width (gunichar c)
{
return G_UNLIKELY (g_unichar_iszerowidth (c)) ? 0 :
G_UNLIKELY (g_unichar_iswide (c)) ? 2 : 1;
}
static G_GNUC_UNUSED glong
pango_utf8_strwidth (const gchar *p)
{
glong len = 0;
g_return_val_if_fail (p != NULL, 0);
while (*p)
{
len += pango_unichar_width (g_utf8_get_char (p));
p = g_utf8_next_char (p);
}
return len;
}
/* Glib's g_utf8_strlen() is broken and stops at embedded NUL's.
* Wrap it here. */
static G_GNUC_UNUSED glong
pango_utf8_strlen (const gchar *p, gssize max)
{
glong len = 0;
const gchar *start = p;
g_return_val_if_fail (p != NULL || max == 0, 0);
if (max <= 0)
return g_utf8_strlen (p, max);
p = g_utf8_next_char (p);
while (p - start < max)
{
++len;
p = g_utf8_next_char (p);
}
/* only do the last len increment if we got a complete
* char (don't count partial chars)
*/
if (p - start <= max)
++len;
return len;
}
G_END_DECLS
#endif /* __PANGO_IMPL_UTILS_H__ */
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