The Tor Browser: gfx/harfbuzz/src/hb-unicode-private.hh@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-unicode-private.hh@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-unicode-private.hh

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 © 2011  Codethink Limited
  * Copyright © 2010,2011,2012  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
  * Codethink Author(s): Ryan Lortie
  * Google Author(s): Behdad Esfahbod
  */
 #ifndef HB_UNICODE_PRIVATE_HH
 #define HB_UNICODE_PRIVATE_HH
 #include "hb-private.hh"
 #include "hb-object-private.hh"
 extern HB_INTERNAL const uint8_t _hb_modified_combining_class[256];
 /*
  * hb_unicode_funcs_t
  */
 #define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS \
   HB_UNICODE_FUNC_IMPLEMENT (combining_class) \
   HB_UNICODE_FUNC_IMPLEMENT (eastasian_width) \
   HB_UNICODE_FUNC_IMPLEMENT (general_category) \
   HB_UNICODE_FUNC_IMPLEMENT (mirroring) \
   HB_UNICODE_FUNC_IMPLEMENT (script) \
   HB_UNICODE_FUNC_IMPLEMENT (compose) \
   HB_UNICODE_FUNC_IMPLEMENT (decompose) \
   HB_UNICODE_FUNC_IMPLEMENT (decompose_compatibility) \
   /* ^--- Add new callbacks here */
 /* Simple callbacks are those taking a hb_codepoint_t and returning a hb_codepoint_t */
 #define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE \
   HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_combining_class_t, combining_class) \
   HB_UNICODE_FUNC_IMPLEMENT (unsigned int, eastasian_width) \
   HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_general_category_t, general_category) \
   HB_UNICODE_FUNC_IMPLEMENT (hb_codepoint_t, mirroring) \
   HB_UNICODE_FUNC_IMPLEMENT (hb_script_t, script) \
   /* ^--- Add new simple callbacks here */
 struct hb_unicode_funcs_t {
   hb_object_header_t header;
   ASSERT_POD ();
   hb_unicode_funcs_t *parent;
   bool immutable;
 #define HB_UNICODE_FUNC_IMPLEMENT(return_type, name) \
   inline return_type name (hb_codepoint_t unicode) { return func.name (this, unicode, user_data.name); }
 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE
 #undef HB_UNICODE_FUNC_IMPLEMENT
   inline hb_bool_t compose (hb_codepoint_t a, hb_codepoint_t b,
 			    hb_codepoint_t *ab)
   {
     *ab = 0;
     if (unlikely (!a || !b)) return false;
     return func.compose (this, a, b, ab, user_data.compose);
   }
   inline hb_bool_t decompose (hb_codepoint_t ab,
 			      hb_codepoint_t *a, hb_codepoint_t *b)
   {
     *a = ab; *b = 0;
     return func.decompose (this, ab, a, b, user_data.decompose);
   }
   inline unsigned int decompose_compatibility (hb_codepoint_t  u,
 					       hb_codepoint_t *decomposed)
   {
     unsigned int ret = func.decompose_compatibility (this, u, decomposed, user_data.decompose_compatibility);
     if (ret == 1 && u == decomposed[0]) {
       decomposed[0] = 0;
       return 0;
     }
     decomposed[ret] = 0;
     return ret;
   }
   unsigned int
   modified_combining_class (hb_codepoint_t unicode)
   {
     /* XXX This hack belongs to the Myanmar shaper. */
     if (unlikely (unicode == 0x1037)) unicode = 0x103A;
     /* XXX This hack belongs to the SEA shaper (for Tai Tham):
      * Reorder SAKOT to ensure it comes after any tone marks. */
     if (unlikely (unicode == 0x1A60)) return 254;
     return _hb_modified_combining_class[combining_class (unicode)];
   }
   inline hb_bool_t
   is_variation_selector (hb_codepoint_t unicode)
   {
     return unlikely (hb_in_ranges<hb_codepoint_t> (unicode,
 x180B, 0x180D, /* MONGOLIAN FREE VARIATION SELECTOR ONE..THREE */
 xFE00, 0xFE0F, /* VARIATION SELECTOR-1..16 */
 xE0100, 0xE01EF));  /* VARIATION SELECTOR-17..256 */
   }
   /* Default_Ignorable codepoints:
    *
    * Note that as of Oct 2012 (Unicode 6.2), U+180E MONGOLIAN VOWEL SEPARATOR
    * is NOT Default_Ignorable, but it really behaves in a way that it should
    * be.  That has been reported to the Unicode Technical Committee for
    * consideration.  As such, we include it here, since Uniscribe removes it.
    * It *is* in Unicode 6.3 however.  U+061C ARABIC LETTER MARK from Unicode
    * 6.3 is also added manually.  The new Unicode 6.3 bidi formatting
    * characters are encoded in a block that was Default_Ignorable already.
    *
    * Note: While U+115F, U+1160, U+3164 and U+FFA0 are Default_Ignorable,
    * we do NOT want to hide them, as the way Uniscribe has implemented them
    * is with regular spacing glyphs, and that's the way fonts are made to work.
    * As such, we make exceptions for those four.
    *
    * Gathered from:
    * http://unicode.org/cldr/utility/list-unicodeset.jsp?a=[:DI:]&abb=on&ucd=on&esc=on
    *
    * Last updated to the page with the following versions:
    * Version 3.6; ICU version: 50.0.1.0; Unicode version: 6.1.0.0
    *
    * 4,167 Code Points
    *
    * [\u00AD\u034F\u115F\u1160\u17B4\u17B5\u180B-\u180D\u200B-\u200F\u202A-\u202E\u2060-\u206F\u3164\uFE00-\uFE0F\uFEFF\uFFA0\uFFF0-\uFFF8\U0001D173-\U0001D17A\U000E0000-\U000E0FFF]
    *
    * 00AD ;SOFT HYPHEN
    * 034F ;COMBINING GRAPHEME JOINER
    * #115F ;HANGUL CHOSEONG FILLER
    * #1160 ;HANGUL JUNGSEONG FILLER
    * 17B4 ;KHMER VOWEL INHERENT AQ
    * 17B5 ;KHMER VOWEL INHERENT AA
    * 180B..180D ;MONGOLIAN FREE VARIATION SELECTOR THREE
    * 200B..200F ;RIGHT-TO-LEFT MARK
    * 202A..202E ;RIGHT-TO-LEFT OVERRIDE
    * 2060..206F ;NOMINAL DIGIT SHAPES
    * #3164 ;HANGUL FILLER
    * FE00..FE0F ;VARIATION SELECTOR-16
    * FEFF ;ZERO WIDTH NO-BREAK SPACE
    * #FFA0 ;HALFWIDTH HANGUL FILLER
    * FFF0..FFF8 ;<unassigned-FFF8>
    * 1D173..1D17A ;MUSICAL SYMBOL END PHRASE
    * E0000..E0FFF ;<unassigned-E0FFF>
    */
   inline hb_bool_t
   is_default_ignorable (hb_codepoint_t ch)
   {
     hb_codepoint_t plane = ch >> 16;
     if (likely (plane == 0))
     {
       /* BMP */
       hb_codepoint_t page = ch >> 8;
       switch (page) {
 	case 0x00: return unlikely (ch == 0x00AD);
 	case 0x03: return unlikely (ch == 0x034F);
 	case 0x06: return unlikely (ch == 0x061C);
 	case 0x17: return hb_in_range<hb_codepoint_t> (ch, 0x17B4, 0x17B5);
 	case 0x18: return hb_in_range<hb_codepoint_t> (ch, 0x180B, 0x180E);
 	case 0x20: return hb_in_ranges<hb_codepoint_t> (ch, 0x200B, 0x200F,
 x202A, 0x202E,
 x2060, 0x206F);
 	case 0xFE: return hb_in_range<hb_codepoint_t> (ch, 0xFE00, 0xFE0F) || ch == 0xFEFF;
 	case 0xFF: return hb_in_range<hb_codepoint_t> (ch, 0xFFF0, 0xFFF8);
 	default: return false;
       }
     }
     else
     {
       /* Other planes */
       switch (plane) {
 	case 0x01: return hb_in_range<hb_codepoint_t> (ch, 0x0001D173, 0x0001D17A);
 	case 0x0E: return hb_in_range<hb_codepoint_t> (ch, 0x000E0000, 0x000E0FFF);
 	default: return false;
       }
     }
   }
   struct {
 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_func_t name;
     HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_UNICODE_FUNC_IMPLEMENT
   } func;
   struct {
 #define HB_UNICODE_FUNC_IMPLEMENT(name) void *name;
     HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_UNICODE_FUNC_IMPLEMENT
   } user_data;
   struct {
 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
     HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_UNICODE_FUNC_IMPLEMENT
   } destroy;
 };
 extern HB_INTERNAL const hb_unicode_funcs_t _hb_unicode_funcs_nil;
 /* Modified combining marks */
 /* Hebrew
  *
  * We permute the "fixed-position" classes 10-26 into the order
  * described in the SBL Hebrew manual:
  *
  * http://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf
  *
  * (as recommended by:
  *  http://forum.fontlab.com/archive-old-microsoft-volt-group/vista-and-diacritic-ordering-t6751.0.html)
  *
  * More details here:
  * https://bugzilla.mozilla.org/show_bug.cgi?id=662055
  */
 #define HB_MODIFIED_COMBINING_CLASS_CCC10 22 /* sheva */
 #define HB_MODIFIED_COMBINING_CLASS_CCC11 15 /* hataf segol */
 #define HB_MODIFIED_COMBINING_CLASS_CCC12 16 /* hataf patah */
 #define HB_MODIFIED_COMBINING_CLASS_CCC13 17 /* hataf qamats */
 #define HB_MODIFIED_COMBINING_CLASS_CCC14 23 /* hiriq */
 #define HB_MODIFIED_COMBINING_CLASS_CCC15 18 /* tsere */
 #define HB_MODIFIED_COMBINING_CLASS_CCC16 19 /* segol */
 #define HB_MODIFIED_COMBINING_CLASS_CCC17 20 /* patah */
 #define HB_MODIFIED_COMBINING_CLASS_CCC18 21 /* qamats */
 #define HB_MODIFIED_COMBINING_CLASS_CCC19 14 /* holam */
 #define HB_MODIFIED_COMBINING_CLASS_CCC20 24 /* qubuts */
 #define HB_MODIFIED_COMBINING_CLASS_CCC21 12 /* dagesh */
 #define HB_MODIFIED_COMBINING_CLASS_CCC22 25 /* meteg */
 #define HB_MODIFIED_COMBINING_CLASS_CCC23 13 /* rafe */
 #define HB_MODIFIED_COMBINING_CLASS_CCC24 10 /* shin dot */
 #define HB_MODIFIED_COMBINING_CLASS_CCC25 11 /* sin dot */
 #define HB_MODIFIED_COMBINING_CLASS_CCC26 26 /* point varika */
 /*
  * Arabic
  *
  * Modify to move Shadda (ccc=33) before other marks.  See:
  * http://unicode.org/faq/normalization.html#8
  * http://unicode.org/faq/normalization.html#9
  */
 #define HB_MODIFIED_COMBINING_CLASS_CCC27 28 /* fathatan */
 #define HB_MODIFIED_COMBINING_CLASS_CCC28 29 /* dammatan */
 #define HB_MODIFIED_COMBINING_CLASS_CCC29 30 /* kasratan */
 #define HB_MODIFIED_COMBINING_CLASS_CCC30 31 /* fatha */
 #define HB_MODIFIED_COMBINING_CLASS_CCC31 32 /* damma */
 #define HB_MODIFIED_COMBINING_CLASS_CCC32 33 /* kasra */
 #define HB_MODIFIED_COMBINING_CLASS_CCC33 27 /* shadda */
 #define HB_MODIFIED_COMBINING_CLASS_CCC34 34 /* sukun */
 #define HB_MODIFIED_COMBINING_CLASS_CCC35 35 /* superscript alef */
 /* Syriac */
 #define HB_MODIFIED_COMBINING_CLASS_CCC36 36 /* superscript alaph */
 /* Telugu
  *
  * Modify Telugu length marks (ccc=84, ccc=91).
  * These are the only matras in the main Indic scripts range that have
  * a non-zero ccc.  That makes them reorder with the Halant that is
  * ccc=9.  Just zero them, we don't need them in our Indic shaper.
  */
 #define HB_MODIFIED_COMBINING_CLASS_CCC84 0 /* length mark */
 #define HB_MODIFIED_COMBINING_CLASS_CCC91 0 /* ai length mark */
 /* Thai
  *
  * Modify U+0E38 and U+0E39 (ccc=103) to be reordered before U+0E3A (ccc=9).
  * Assign 3, which is unassigned otherwise.
  * Uniscribe does this reordering too.
  */
 #define HB_MODIFIED_COMBINING_CLASS_CCC103 3 /* sara u / sara uu */
 #define HB_MODIFIED_COMBINING_CLASS_CCC107 107 /* mai * */
 /* Lao */
 #define HB_MODIFIED_COMBINING_CLASS_CCC118 118 /* sign u / sign uu */
 #define HB_MODIFIED_COMBINING_CLASS_CCC122 122 /* mai * */
 /* Tibetan */
 #define HB_MODIFIED_COMBINING_CLASS_CCC129 129 /* sign aa */
 #define HB_MODIFIED_COMBINING_CLASS_CCC130 130 /* sign i */
 #define HB_MODIFIED_COMBINING_CLASS_CCC132 132 /* sign u */
 /* Misc */
 #define HB_UNICODE_GENERAL_CATEGORY_IS_MARK(gen_cat) \
 	(FLAG (gen_cat) & \
 	 (FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \
 	  FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | \
 	  FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))
 #endif /* HB_UNICODE_PRIVATE_HH */

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gfx/harfbuzz/src/hb-unicode-private.hh@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-unicode-private.hh