The Tor Browser: gfx/harfbuzz/src/hb-shape.cc@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-shape.cc@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-shape.cc

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /*
  * Copyright © 2009  Red Hat, Inc.
  * Copyright © 2012  Google, 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
  * Google Author(s): Behdad Esfahbod
  */
 #include "hb-private.hh"
 #include "hb-shaper-private.hh"
 #include "hb-shape-plan-private.hh"
 #include "hb-buffer-private.hh"
 #include "hb-font-private.hh"
 static void
 parse_space (const char **pp, const char *end)
 {
   char c;
   while (*pp < end && (c = **pp, ISSPACE (c)))
     (*pp)++;
 }
 static hb_bool_t
 parse_char (const char **pp, const char *end, char c)
 {
   parse_space (pp, end);
   if (*pp == end || **pp != c)
     return false;
   (*pp)++;
   return true;
 }
 static hb_bool_t
 parse_uint (const char **pp, const char *end, unsigned int *pv)
 {
   char buf[32];
   unsigned int len = MIN (ARRAY_LENGTH (buf) - 1, (unsigned int) (end - *pp));
   strncpy (buf, *pp, len);
   buf[len] = '\0';
   char *p = buf;
   char *pend = p;
   unsigned int v;
   /* Intentionally use strtol instead of strtoul, such that
    * -1 turns into "big number"... */
   errno = 0;
   v = strtol (p, &pend, 0);
   if (errno || p == pend)
     return false;
   *pv = v;
   *pp += pend - p;
   return true;
 }
 static hb_bool_t
 parse_feature_value_prefix (const char **pp, const char *end, hb_feature_t *feature)
 {
   if (parse_char (pp, end, '-'))
     feature->value = 0;
   else {
     parse_char (pp, end, '+');
     feature->value = 1;
   }
   return true;
 }
 static hb_bool_t
 parse_feature_tag (const char **pp, const char *end, hb_feature_t *feature)
 {
   const char *p = *pp;
   char c;
   parse_space (pp, end);
 #define ISALNUM(c) (('a' <= (c) && (c) <= 'z') || ('A' <= (c) && (c) <= 'Z') || ('0' <= (c) && (c) <= '9'))
   while (*pp < end && (c = **pp, ISALNUM(c)))
     (*pp)++;
 #undef ISALNUM
   if (p == *pp)
     return false;
   feature->tag = hb_tag_from_string (p, *pp - p);
   return true;
 }
 static hb_bool_t
 parse_feature_indices (const char **pp, const char *end, hb_feature_t *feature)
 {
   parse_space (pp, end);
   hb_bool_t has_start;
   feature->start = 0;
   feature->end = (unsigned int) -1;
   if (!parse_char (pp, end, '['))
     return true;
   has_start = parse_uint (pp, end, &feature->start);
   if (parse_char (pp, end, ':')) {
     parse_uint (pp, end, &feature->end);
   } else {
     if (has_start)
       feature->end = feature->start + 1;
   }
   return parse_char (pp, end, ']');
 }
 static hb_bool_t
 parse_feature_value_postfix (const char **pp, const char *end, hb_feature_t *feature)
 {
   return !parse_char (pp, end, '=') || parse_uint (pp, end, &feature->value);
 }
 static hb_bool_t
 parse_one_feature (const char **pp, const char *end, hb_feature_t *feature)
 {
   return parse_feature_value_prefix (pp, end, feature) &&
 	 parse_feature_tag (pp, end, feature) &&
 	 parse_feature_indices (pp, end, feature) &&
 	 parse_feature_value_postfix (pp, end, feature) &&
 	 *pp == end;
 }
 /**
  * hb_feature_from_string:
  * @str: (array length=len):
  * @len:
  * @feature: (out):
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 hb_bool_t
 hb_feature_from_string (const char *str, int len,
 			hb_feature_t *feature)
 {
   if (len < 0)
     len = strlen (str);
   return parse_one_feature (&str, str + len, feature);
 }
 /**
  * hb_feature_to_string:
  * @feature:
  * @buf: (array length=size):
  * @size:
  *
  *
  *
  * Since: 1.0
  **/
 void
 hb_feature_to_string (hb_feature_t *feature,
 		      char *buf, unsigned int size)
 {
   if (unlikely (!size)) return;
   char s[128];
   unsigned int len = 0;
   if (feature->value == 0)
     s[len++] = '-';
   hb_tag_to_string (feature->tag, s + len);
   len += 4;
   while (len && s[len - 1] == ' ')
     len--;
   if (feature->start != 0 || feature->end != (unsigned int) -1)
   {
     s[len++] = '[';
     if (feature->start)
       len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%d", feature->start));
     if (feature->end != feature->start + 1) {
       s[len++] = ':';
       if (feature->end != (unsigned int) -1)
 	len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%d", feature->end));
     }
     s[len++] = ']';
   }
   if (feature->value > 1)
   {
     s[len++] = '=';
     len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%d", feature->value));
   }
   assert (len < ARRAY_LENGTH (s));
   len = MIN (len, size - 1);
   memcpy (buf, s, len);
   buf[len] = '\0';
 }
 static const char **static_shaper_list;
 static inline
 void free_static_shaper_list (void)
 {
   free (static_shaper_list);
 }
 /**
  * hb_shape_list_shapers:
  *
  *
  *
  * Return value: (transfer none):
  *
  * Since: 1.0
  **/
 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 + HB_SHAPERS_COUNT, sizeof (const char *));
     if (unlikely (!shaper_list)) {
       static const char *nil_shaper_list[] = {NULL};
       return nil_shaper_list;
     }
     const hb_shaper_pair_t *shapers = _hb_shapers_get ();
     unsigned int i;
     for (i = 0; i < HB_SHAPERS_COUNT; 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_shape_full:
  * @font: a font.
  * @buffer: a buffer.
  * @features: (array length=num_features):
  * @num_features:
  * @shaper_list: (array zero-terminated=1):
  *
  *
  *
  * Return value:
  *
  * Since: 1.0
  **/
 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)
 {
   if (unlikely (!buffer->len))
     return true;
   assert (buffer->content_type == HB_BUFFER_CONTENT_TYPE_UNICODE);
   hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props, features, num_features, shaper_list);
   hb_bool_t res = hb_shape_plan_execute (shape_plan, font, buffer, features, num_features);
   hb_shape_plan_destroy (shape_plan);
   if (res)
     buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS;
   return res;
 }
 /**
  * hb_shape:
  * @font: a font.
  * @buffer: a buffer.
  * @features: (array length=num_features):
  * @num_features:
  *
  *
  *
  * Since: 1.0
  **/
 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);
 }

The Tor Browser / annotate

gfx/harfbuzz/src/hb-shape.cc@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-shape.cc