The Tor Browser: gfx/harfbuzz/src/hb-ot-shape-complex-myanmar.cc@129ffea94266 (annotated)

gfx/harfbuzz/src/hb-ot-shape-complex-myanmar.cc@129ffea94266 (annotated)

gfx/harfbuzz/src/hb-ot-shape-complex-myanmar.cc

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * Copyright © 2011,2012,2013  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.
  *
  * Google Author(s): Behdad Esfahbod
  */
 #include "hb-ot-shape-complex-indic-private.hh"
 /* buffer var allocations */
 #define myanmar_category() complex_var_u8_0() /* myanmar_category_t */
 #define myanmar_position() complex_var_u8_1() /* myanmar_position_t */
 /*
  * Myanmar shaper.
  */
 static const hb_tag_t
 basic_features[] =
 {
   /*
    * Basic features.
    * These features are applied in order, one at a time, after initial_reordering.
    */
   HB_TAG('r','p','h','f'),
   HB_TAG('p','r','e','f'),
   HB_TAG('b','l','w','f'),
   HB_TAG('p','s','t','f'),
 };
 static const hb_tag_t
 other_features[] =
 {
   /*
    * Other features.
    * These features are applied all at once, after final_reordering.
    */
   HB_TAG('p','r','e','s'),
   HB_TAG('a','b','v','s'),
   HB_TAG('b','l','w','s'),
   HB_TAG('p','s','t','s'),
   /* Positioning features, though we don't care about the types. */
   HB_TAG('d','i','s','t'),
   /* Pre-release version of Windows 8 Myanmar font had abvm,blwm
    * features.  The released Windows 8 version of the font (as well
    * as the released spec) used 'mark' instead.  The Windows 8
    * shaper however didn't apply 'mark' but did apply 'mkmk'.
    * Perhaps it applied abvm/blwm.  This was fixed in a Windows 8
    * update, so now it applies mark/mkmk.  We are guessing that
    * it still applies abvm/blwm too.
    */
   HB_TAG('a','b','v','m'),
   HB_TAG('b','l','w','m'),
 };
 static void
 setup_syllables (const hb_ot_shape_plan_t *plan,
 		 hb_font_t *font,
 		 hb_buffer_t *buffer);
 static void
 initial_reordering (const hb_ot_shape_plan_t *plan,
 		    hb_font_t *font,
 		    hb_buffer_t *buffer);
 static void
 final_reordering (const hb_ot_shape_plan_t *plan,
 		  hb_font_t *font,
 		  hb_buffer_t *buffer);
 static void
 collect_features_myanmar (hb_ot_shape_planner_t *plan)
 {
   hb_ot_map_builder_t *map = &plan->map;
   /* Do this before any lookups have been applied. */
   map->add_gsub_pause (setup_syllables);
   map->add_global_bool_feature (HB_TAG('l','o','c','l'));
   /* The Indic specs do not require ccmp, but we apply it here since if
    * there is a use of it, it's typically at the beginning. */
   map->add_global_bool_feature (HB_TAG('c','c','m','p'));
   map->add_gsub_pause (initial_reordering);
   for (unsigned int i = 0; i < ARRAY_LENGTH (basic_features); i++)
   {
     map->add_feature (basic_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
     map->add_gsub_pause (NULL);
   }
   map->add_gsub_pause (final_reordering);
   for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++)
     map->add_feature (other_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
 }
 static void
 override_features_myanmar (hb_ot_shape_planner_t *plan)
 {
   plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL);
 }
 enum syllable_type_t {
   consonant_syllable,
   punctuation_cluster,
   broken_cluster,
   non_myanmar_cluster,
 };
 #include "hb-ot-shape-complex-myanmar-machine.hh"
 /* Note: This enum is duplicated in the -machine.rl source file.
  * Not sure how to avoid duplication. */
 enum myanmar_category_t {
   OT_As  = 18, /* Asat */
   OT_D   = 19, /* Digits except zero */
   OT_D0  = 20, /* Digit zero */
   OT_DB  = OT_N, /* Dot below */
   OT_GB  = OT_DOTTEDCIRCLE,
   OT_MH  = 21, /* Various consonant medial types */
   OT_MR  = 22, /* Various consonant medial types */
   OT_MW  = 23, /* Various consonant medial types */
   OT_MY  = 24, /* Various consonant medial types */
   OT_PT  = 25, /* Pwo and other tones */
   OT_VAbv = 26,
   OT_VBlw = 27,
   OT_VPre = 28,
   OT_VPst = 29,
   OT_VS   = 30, /* Variation selectors */
   OT_P    = 31  /* Punctuation */
 };
 static inline bool
 is_one_of (const hb_glyph_info_t &info, unsigned int flags)
 {
   /* If it ligated, all bets are off. */
   if (_hb_glyph_info_ligated (&info)) return false;
   return !!(FLAG (info.myanmar_category()) & flags);
 }
 /* Note:
  *
  * We treat Vowels and placeholders as if they were consonants.  This is safe because Vowels
  * cannot happen in a consonant syllable.  The plus side however is, we can call the
  * consonant syllable logic from the vowel syllable function and get it all right! */
 #define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_CM) | FLAG (OT_Ra) | FLAG (OT_V) | FLAG (OT_NBSP) | FLAG (OT_GB))
 static inline bool
 is_consonant (const hb_glyph_info_t &info)
 {
   return is_one_of (info, CONSONANT_FLAGS);
 }
 static inline void
 set_myanmar_properties (hb_glyph_info_t &info)
 {
   hb_codepoint_t u = info.codepoint;
   unsigned int type = hb_indic_get_categories (u);
   indic_category_t cat = (indic_category_t) (type & 0x7F);
   indic_position_t pos = (indic_position_t) (type >> 8);
   /* Myanmar
    * http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm#analyze
    */
   if (unlikely (hb_in_range<hb_codepoint_t> (u, 0xFE00, 0xFE0F)))
     cat = (indic_category_t) OT_VS;
   else if (unlikely (u == 0x200C)) cat = (indic_category_t) OT_ZWNJ;
   else if (unlikely (u == 0x200D)) cat = (indic_category_t) OT_ZWJ;
   switch (u)
   {
     case 0x104E:
       cat = (indic_category_t) OT_C; /* The spec says C, IndicSyllableCategory doesn't have. */
       break;
     case 0x002D: case 0x00A0: case 0x00D7: case 0x2012:
     case 0x2013: case 0x2014: case 0x2015: case 0x2022:
     case 0x25CC: case 0x25FB: case 0x25FC: case 0x25FD:
     case 0x25FE:
       cat = (indic_category_t) OT_GB;
       break;
     case 0x1004: case 0x101B: case 0x105A:
       cat = (indic_category_t) OT_Ra;
       break;
     case 0x1032: case 0x1036:
       cat = (indic_category_t) OT_A;
       break;
     case 0x103A:
       cat = (indic_category_t) OT_As;
       break;
     case 0x1041: case 0x1042: case 0x1043: case 0x1044:
     case 0x1045: case 0x1046: case 0x1047: case 0x1048:
     case 0x1049: case 0x1090: case 0x1091: case 0x1092:
     case 0x1093: case 0x1094: case 0x1095: case 0x1096:
     case 0x1097: case 0x1098: case 0x1099:
       cat = (indic_category_t) OT_D;
       break;
     case 0x1040:
       cat = (indic_category_t) OT_D; /* XXX The spec says D0, but Uniscribe doesn't seem to do. */
       break;
     case 0x103E: case 0x1060:
       cat = (indic_category_t) OT_MH;
       break;
     case 0x103C:
       cat = (indic_category_t) OT_MR;
       break;
     case 0x103D: case 0x1082:
       cat = (indic_category_t) OT_MW;
       break;
     case 0x103B: case 0x105E: case 0x105F:
       cat = (indic_category_t) OT_MY;
       break;
     case 0x1063: case 0x1064: case 0x1069: case 0x106A:
     case 0x106B: case 0x106C: case 0x106D: case 0xAA7B:
       cat = (indic_category_t) OT_PT;
       break;
     case 0x1038: case 0x1087: case 0x1088: case 0x1089:
     case 0x108A: case 0x108B: case 0x108C: case 0x108D:
     case 0x108F: case 0x109A: case 0x109B: case 0x109C:
       cat = (indic_category_t) OT_SM;
       break;
     case 0x104A: case 0x104B:
       cat = (indic_category_t) OT_P;
       break;
   }
   if (cat == OT_M)
   {
     switch ((int) pos)
     {
       case POS_PRE_C:	cat = (indic_category_t) OT_VPre;
 			pos = POS_PRE_M;                  break;
       case POS_ABOVE_C:	cat = (indic_category_t) OT_VAbv; break;
       case POS_BELOW_C:	cat = (indic_category_t) OT_VBlw; break;
       case POS_POST_C:	cat = (indic_category_t) OT_VPst; break;
     }
   }
   info.myanmar_category() = (myanmar_category_t) cat;
   info.myanmar_position() = pos;
 }
 static void
 setup_masks_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED,
 		   hb_buffer_t              *buffer,
 		   hb_font_t                *font HB_UNUSED)
 {
   HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_category);
   HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_position);
   /* We cannot setup masks here.  We save information about characters
    * and setup masks later on in a pause-callback. */
   unsigned int count = buffer->len;
   for (unsigned int i = 0; i < count; i++)
     set_myanmar_properties (buffer->info[i]);
 }
 static void
 setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED,
 		 hb_font_t *font HB_UNUSED,
 		 hb_buffer_t *buffer)
 {
   find_syllables (buffer);
 }
 static int
 compare_myanmar_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb)
 {
   int a = pa->myanmar_position();
   int b = pb->myanmar_position();
   return a < b ? -1 : a == b ? 0 : +1;
 }
 /* Rules from:
  * http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm */
 static void
 initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan,
 				       hb_face_t *face,
 				       hb_buffer_t *buffer,
 				       unsigned int start, unsigned int end)
 {
   hb_glyph_info_t *info = buffer->info;
   unsigned int base = end;
   bool has_reph = false;
   {
     unsigned int limit = start;
     if (start + 3 <= end &&
 	info[start  ].myanmar_category() == OT_Ra &&
 	info[start+1].myanmar_category() == OT_As &&
 	info[start+2].myanmar_category() == OT_H)
     {
       limit += 3;
       base = start;
       has_reph = true;
     }
     {
       if (!has_reph)
 	base = limit;
       for (unsigned int i = limit; i < end; i++)
 	if (is_consonant (info[i]))
 	{
 	  base = i;
 	  break;
 	}
     }
   }
   /* Reorder! */
   {
     unsigned int i = start;
     for (; i < start + (has_reph ? 3 : 0); i++)
       info[i].myanmar_position() = POS_AFTER_MAIN;
     for (; i < base; i++)
       info[i].myanmar_position() = POS_PRE_C;
     if (i < end)
     {
       info[i].myanmar_position() = POS_BASE_C;
       i++;
     }
     indic_position_t pos = POS_AFTER_MAIN;
     /* The following loop may be ugly, but it implements all of
      * Myanmar reordering! */
     for (; i < end; i++)
     {
       if (info[i].myanmar_category() == OT_MR) /* Pre-base reordering */
       {
 	info[i].myanmar_position() = POS_PRE_C;
 	continue;
       }
       if (info[i].myanmar_position() < POS_BASE_C) /* Left matra */
       {
 	continue;
       }
       if (pos == POS_AFTER_MAIN && info[i].myanmar_category() == OT_VBlw)
       {
 	pos = POS_BELOW_C;
 	info[i].myanmar_position() = pos;
 	continue;
       }
       if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_A)
       {
 	info[i].myanmar_position() = POS_BEFORE_SUB;
 	continue;
       }
       if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_VBlw)
       {
 	info[i].myanmar_position() = pos;
 	continue;
       }
       if (pos == POS_BELOW_C && info[i].myanmar_category() != OT_A)
       {
         pos = POS_AFTER_SUB;
 	info[i].myanmar_position() = pos;
 	continue;
       }
       info[i].myanmar_position() = pos;
     }
   }
   buffer->merge_clusters (start, end);
   /* Sit tight, rock 'n roll! */
   hb_bubble_sort (info + start, end - start, compare_myanmar_order);
 }
 static void
 initial_reordering_broken_cluster (const hb_ot_shape_plan_t *plan,
 				   hb_face_t *face,
 				   hb_buffer_t *buffer,
 				   unsigned int start, unsigned int end)
 {
   /* We already inserted dotted-circles, so just call the consonant_syllable. */
   initial_reordering_consonant_syllable (plan, face, buffer, start, end);
 }
 static void
 initial_reordering_punctuation_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED,
 					hb_face_t *face HB_UNUSED,
 					hb_buffer_t *buffer HB_UNUSED,
 					unsigned int start HB_UNUSED, unsigned int end HB_UNUSED)
 {
   /* Nothing to do right now.  If we ever switch to using the output
    * buffer in the reordering process, we'd need to next_glyph() here. */
 }
 static void
 initial_reordering_non_myanmar_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED,
 					hb_face_t *face HB_UNUSED,
 					hb_buffer_t *buffer HB_UNUSED,
 					unsigned int start HB_UNUSED, unsigned int end HB_UNUSED)
 {
   /* Nothing to do right now.  If we ever switch to using the output
    * buffer in the reordering process, we'd need to next_glyph() here. */
 }
 static void
 initial_reordering_syllable (const hb_ot_shape_plan_t *plan,
 			     hb_face_t *face,
 			     hb_buffer_t *buffer,
 			     unsigned int start, unsigned int end)
 {
   syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F);
   switch (syllable_type) {
   case consonant_syllable:	initial_reordering_consonant_syllable  (plan, face, buffer, start, end); return;
   case punctuation_cluster:	initial_reordering_punctuation_cluster (plan, face, buffer, start, end); return;
   case broken_cluster:		initial_reordering_broken_cluster      (plan, face, buffer, start, end); return;
   case non_myanmar_cluster:	initial_reordering_non_myanmar_cluster (plan, face, buffer, start, end); return;
   }
 }
 static inline void
 insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
 		       hb_font_t *font,
 		       hb_buffer_t *buffer)
 {
   /* Note: This loop is extra overhead, but should not be measurable. */
   bool has_broken_syllables = false;
   unsigned int count = buffer->len;
   for (unsigned int i = 0; i < count; i++)
     if ((buffer->info[i].syllable() & 0x0F) == broken_cluster) {
       has_broken_syllables = true;
       break;
     }
   if (likely (!has_broken_syllables))
     return;
   hb_codepoint_t dottedcircle_glyph;
   if (!font->get_glyph (0x25CC, 0, &dottedcircle_glyph))
     return;
   hb_glyph_info_t dottedcircle = {0};
   dottedcircle.codepoint = 0x25CC;
   set_myanmar_properties (dottedcircle);
   dottedcircle.codepoint = dottedcircle_glyph;
   buffer->clear_output ();
   buffer->idx = 0;
   unsigned int last_syllable = 0;
   while (buffer->idx < buffer->len)
   {
     unsigned int syllable = buffer->cur().syllable();
     syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F);
     if (unlikely (last_syllable != syllable && syllable_type == broken_cluster))
     {
       last_syllable = syllable;
       hb_glyph_info_t info = dottedcircle;
       info.cluster = buffer->cur().cluster;
       info.mask = buffer->cur().mask;
       info.syllable() = buffer->cur().syllable();
       buffer->output_info (info);
     }
     else
       buffer->next_glyph ();
   }
   buffer->swap_buffers ();
 }
 static void
 initial_reordering (const hb_ot_shape_plan_t *plan,
 		    hb_font_t *font,
 		    hb_buffer_t *buffer)
 {
   insert_dotted_circles (plan, font, buffer);
   hb_glyph_info_t *info = buffer->info;
   unsigned int count = buffer->len;
   if (unlikely (!count)) return;
   unsigned int last = 0;
   unsigned int last_syllable = info[0].syllable();
   for (unsigned int i = 1; i < count; i++)
     if (last_syllable != info[i].syllable()) {
       initial_reordering_syllable (plan, font->face, buffer, last, i);
       last = i;
       last_syllable = info[last].syllable();
     }
   initial_reordering_syllable (plan, font->face, buffer, last, count);
 }
 static void
 final_reordering (const hb_ot_shape_plan_t *plan,
 		  hb_font_t *font HB_UNUSED,
 		  hb_buffer_t *buffer)
 {
   hb_glyph_info_t *info = buffer->info;
   unsigned int count = buffer->len;
   /* Zero syllables now... */
   for (unsigned int i = 0; i < count; i++)
     info[i].syllable() = 0;
   HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_category);
   HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_position);
 }
 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar =
 {
   "myanmar",
   collect_features_myanmar,
   override_features_myanmar,
   NULL, /* data_create */
   NULL, /* data_destroy */
   NULL, /* preprocess_text */
   HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
   NULL, /* decompose */
   NULL, /* compose */
   setup_masks_myanmar,
   HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY,
   false, /* fallback_position */
 };

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gfx/harfbuzz/src/hb-ot-shape-complex-myanmar.cc@129ffea94266 (annotated)

gfx/harfbuzz/src/hb-ot-shape-complex-myanmar.cc