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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
/* 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,
unsigned int 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;
}
/* To be made public at some point */
static G_GNUC_UNUSED void
pango_glyph_string_reverse_range (PangoGlyphString *glyphs,
int start, int end)
{
int i, j;
for (i = start, j = end - 1; i < j; i++, j--)
{
PangoGlyphInfo glyph_info;
gint log_cluster;
glyph_info = glyphs->glyphs[i];
glyphs->glyphs[i] = glyphs->glyphs[j];
glyphs->glyphs[j] = glyph_info;
log_cluster = glyphs->log_clusters[i];
glyphs->log_clusters[i] = glyphs->log_clusters[j];
glyphs->log_clusters[j] = log_cluster;
}
}
/* The cairo hexbox drawing code assumes
* that these nicks are 1-6 ASCII chars
*/
static struct {
gunichar ch;
const char *nick;
} ignorables[] = {
{ 0x00ad, "SHY" }, /* SOFT HYPHEN */
{ 0x034f, "CGJ" }, /* COMBINING GRAPHEME JOINER */
{ 0x200b, "ZWS" }, /* ZERO WIDTH SPACE */
{ 0x200c, "ZWNJ" }, /* ZERO WIDTH NON-JOINER */
{ 0x200d, "ZWJ" }, /* ZERO WIDTH JOINER */
{ 0x200e, "LRM" }, /* LEFT-TO-RIGHT MARK */
{ 0x200f, "RLM" }, /* RIGHT-TO-LEFT MARK */
{ 0x2028, "LS" }, /* LINE SEPARATOR */
{ 0x2029, "PS" }, /* PARAGRAPH SEPARATOR */
{ 0x202a, "LRE" }, /* LEFT-TO-RIGHT EMBEDDING */
{ 0x202b, "RLE" }, /* RIGHT-TO-LEFT EMBEDDING */
{ 0x202c, "PDF" }, /* POP DIRECTIONAL FORMATTING */
{ 0x202d, "LRO" }, /* LEFT-TO-RIGHT OVERRIDE */
{ 0x202e, "RLO" }, /* RIGHT-TO-LEFT OVERRIDE */
{ 0x2060, "WJ" }, /* WORD JOINER */
{ 0x2061, "FA" }, /* FUNCTION APPLICATION */
{ 0x2062, "IT" }, /* INVISIBLE TIMES */
{ 0x2063, "IS" }, /* INVISIBLE SEPARATOR */
{ 0xfeff, "ZWNBS" }, /* ZERO WIDTH NO-BREAK SPACE */
};
static inline G_GNUC_UNUSED const char *
pango_get_ignorable (gunichar ch)
{
int i;
for (i = 0; i < G_N_ELEMENTS (ignorables); i++)
{
if (ch == ignorables[i].ch)
return ignorables[i].nick;
}
return NULL;
}
static inline G_GNUC_UNUSED const char *
pango_get_ignorable_size (gunichar ch,
int *rows,
int *cols)
{
const char *nick;
int len;
nick = pango_get_ignorable (ch);
if (nick)
{
len = strlen (nick);
if (len < 4)
{
*rows = 1;
*cols = len;
}
else if (len > 4)
{
*rows = 2;
*cols = 3;
}
else
{
*rows = 2;
*cols = 2;
}
}
return nick;
}
G_END_DECLS
#endif /* __PANGO_IMPL_UTILS_H__ */
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