kc3-lang/harfbuzz/src/hb-shape.cc

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• Author : Behdad Esfahbod
  Date : 2012-04-17 12:37:19
  Hash : a5e40542
  Message : Make font immutable in hb_shape()

• src/hb-shape.cc

• /*
   * 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 struct hb_shaper_pair_t {
    char name[16];
    hb_shape_func_t func;
  } 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
  
  static struct static_shaper_list_t
  {
    static_shaper_list_t (void)
    {
      char *env = getenv ("HB_SHAPER_LIST");
      if (env && *env)
      {
         /* Reorder shaper list to prefer requested shaper list. */
        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 (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;
        }
      }
  
      ASSERT_STATIC ((ARRAY_LENGTH (shapers) + 1) * sizeof (*shaper_list) <= sizeof (shaper_list));
      unsigned int i;
      for (i = 0; i < ARRAY_LENGTH (shapers); i++)
        shaper_list[i] = shapers[i].name;
      shaper_list[i] = NULL;
    }
  
    const char *shaper_list[ARRAY_LENGTH (shapers) + 1];
  } static_shaper_list;
  
  const char **
  hb_shape_list_shapers (void)
  {
    return static_shaper_list.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)) {
      for (unsigned int i = 0; i < ARRAY_LENGTH (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 (shapers); i++)
  	if (0 == strcmp (*shaper_list, shapers[i].name)) {
  	  if (likely (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);
  }