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/*
* Copyright © 2009 Red Hat, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
*/
#include "hb-private.hh"
#include "hb-shape.h"
#include "hb-buffer-private.hh"
#ifdef HAVE_GRAPHITE
#include "hb-graphite2-private.hh"
#endif
#ifdef HAVE_UNISCRIBE
# include "hb-uniscribe-private.hh"
#endif
#ifdef HAVE_OT
# include "hb-ot-shape-private.hh"
#endif
#include "hb-fallback-shape-private.hh"
typedef hb_bool_t (*hb_shape_func_t) (hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features);
#define HB_SHAPER_IMPLEMENT(name) {#name, _hb_##name##_shape}
static const struct hb_shaper_pair_t {
char name[16];
hb_shape_func_t func;
} all_shapers[] = {
/* v--- Add new shapers in the right place here */
#ifdef HAVE_GRAPHITE
HB_SHAPER_IMPLEMENT (graphite2),
#endif
#ifdef HAVE_UNISCRIBE
HB_SHAPER_IMPLEMENT (uniscribe),
#endif
#ifdef HAVE_OT
HB_SHAPER_IMPLEMENT (ot),
#endif
HB_SHAPER_IMPLEMENT (fallback) /* should be last */
};
#undef HB_SHAPER_IMPLEMENT
/* Thread-safe, lock-free, shapers */
static hb_shaper_pair_t *static_shapers;
static
void free_static_shapers (void)
{
if (unlikely (static_shapers != all_shapers))
free (static_shapers);
}
static const hb_shaper_pair_t *
get_shapers (void)
{
retry:
hb_shaper_pair_t *shapers = (hb_shaper_pair_t *) hb_atomic_ptr_get (&static_shapers);
if (unlikely (!shapers))
{
char *env = getenv ("HB_SHAPER_LIST");
if (!env || !*env) {
(void) hb_atomic_ptr_cmpexch (&static_shapers, NULL, (const hb_shaper_pair_t *) all_shapers);
return (const hb_shaper_pair_t *) all_shapers;
}
/* Not found; allocate one. */
shapers = (hb_shaper_pair_t *) malloc (sizeof (all_shapers));
if (unlikely (!shapers))
return (const hb_shaper_pair_t *) all_shapers;
memcpy (shapers, all_shapers, sizeof (all_shapers));
/* Reorder shaper list to prefer requested shapers. */
unsigned int i = 0;
char *end, *p = env;
for (;;) {
end = strchr (p, ',');
if (!end)
end = p + strlen (p);
for (unsigned int j = i; j < ARRAY_LENGTH (all_shapers); j++)
if (end - p == (int) strlen (shapers[j].name) &&
0 == strncmp (shapers[j].name, p, end - p))
{
/* Reorder this shaper to position i */
struct hb_shaper_pair_t t = shapers[j];
memmove (&shapers[i + 1], &shapers[i], sizeof (shapers[i]) * (j - i));
shapers[i] = t;
i++;
}
if (!*end)
break;
else
p = end + 1;
}
if (!hb_atomic_ptr_cmpexch (&static_shapers, NULL, shapers)) {
free (shapers);
goto retry;
}
#ifdef HAVE_ATEXIT
atexit (free_static_shapers); /* First person registers atexit() callback. */
#endif
}
return shapers;
}
static const char **static_shaper_list;
static
void free_static_shaper_list (void)
{
free (static_shaper_list);
}
const char **
hb_shape_list_shapers (void)
{
retry:
const char **shaper_list = (const char **) hb_atomic_ptr_get (&static_shaper_list);
if (unlikely (!shaper_list))
{
/* Not found; allocate one. */
shaper_list = (const char **) calloc (1 + ARRAY_LENGTH (all_shapers), sizeof (const char *));
if (unlikely (!shaper_list)) {
static const char *nil_shaper_list[] = {NULL};
return nil_shaper_list;
}
const hb_shaper_pair_t *shapers = get_shapers ();
unsigned int i;
for (i = 0; i < ARRAY_LENGTH (all_shapers); i++)
shaper_list[i] = shapers[i].name;
shaper_list[i] = NULL;
if (!hb_atomic_ptr_cmpexch (&static_shaper_list, NULL, shaper_list)) {
free (shaper_list);
goto retry;
}
#ifdef HAVE_ATEXIT
atexit (free_static_shaper_list); /* First person registers atexit() callback. */
#endif
}
return shaper_list;
}
hb_bool_t
hb_shape_full (hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features,
const char * const *shaper_list)
{
hb_font_make_immutable (font); /* So we can safely cache stuff on it */
if (likely (!shaper_list)) {
const hb_shaper_pair_t *shapers = get_shapers ();
for (unsigned int i = 0; i < ARRAY_LENGTH (all_shapers); i++)
if (likely (shapers[i].func (font, buffer, features, num_features)))
return true;
} else {
while (*shaper_list) {
for (unsigned int i = 0; i < ARRAY_LENGTH (all_shapers); i++)
if (0 == strcmp (*shaper_list, all_shapers[i].name)) {
if (likely (all_shapers[i].func (font, buffer, features, num_features)))
return true;
break;
}
shaper_list++;
}
}
return false;
}
void
hb_shape (hb_font_t *font,
hb_buffer_t *buffer,
const hb_feature_t *features,
unsigned int num_features)
{
hb_shape_full (font, buffer, features, num_features, NULL);
}
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