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

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

gfx/harfbuzz/src/hb-icu.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 © 2009  Keith Stribley
  * Copyright © 2011  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-icu.h"
 #include "hb-unicode-private.hh"
 #include <unicode/uchar.h>
 #include <unicode/unorm.h>
 #include <unicode/ustring.h>
 #include <unicode/uversion.h>
 hb_script_t
 hb_icu_script_to_script (UScriptCode script)
 {
   if (unlikely (script == USCRIPT_INVALID_CODE))
     return HB_SCRIPT_INVALID;
   return hb_script_from_string (uscript_getShortName (script), -1);
 }
 UScriptCode
 hb_icu_script_from_script (hb_script_t script)
 {
   if (unlikely (script == HB_SCRIPT_INVALID))
     return USCRIPT_INVALID_CODE;
   for (unsigned int i = 0; i < USCRIPT_CODE_LIMIT; i++)
     if (unlikely (hb_icu_script_to_script ((UScriptCode) i) == script))
       return (UScriptCode) i;
   return USCRIPT_UNKNOWN;
 }
 static hb_unicode_combining_class_t
 hb_icu_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 				hb_codepoint_t      unicode,
 				void               *user_data HB_UNUSED)
 {
   return (hb_unicode_combining_class_t) u_getCombiningClass (unicode);
 }
 static unsigned int
 hb_icu_unicode_eastasian_width (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 				hb_codepoint_t      unicode,
 				void               *user_data HB_UNUSED)
 {
   switch (u_getIntPropertyValue(unicode, UCHAR_EAST_ASIAN_WIDTH))
   {
   case U_EA_WIDE:
   case U_EA_FULLWIDTH:
     return 2;
   case U_EA_NEUTRAL:
   case U_EA_AMBIGUOUS:
   case U_EA_HALFWIDTH:
   case U_EA_NARROW:
     return 1;
   }
   return 1;
 }
 static hb_unicode_general_category_t
 hb_icu_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 				 hb_codepoint_t      unicode,
 				 void               *user_data HB_UNUSED)
 {
   switch (u_getIntPropertyValue(unicode, UCHAR_GENERAL_CATEGORY))
   {
   case U_UNASSIGNED:			return HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED;
   case U_UPPERCASE_LETTER:		return HB_UNICODE_GENERAL_CATEGORY_UPPERCASE_LETTER;
   case U_LOWERCASE_LETTER:		return HB_UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER;
   case U_TITLECASE_LETTER:		return HB_UNICODE_GENERAL_CATEGORY_TITLECASE_LETTER;
   case U_MODIFIER_LETTER:		return HB_UNICODE_GENERAL_CATEGORY_MODIFIER_LETTER;
   case U_OTHER_LETTER:			return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER;
   case U_NON_SPACING_MARK:		return HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK;
   case U_ENCLOSING_MARK:		return HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK;
   case U_COMBINING_SPACING_MARK:	return HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK;
   case U_DECIMAL_DIGIT_NUMBER:		return HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER;
   case U_LETTER_NUMBER:			return HB_UNICODE_GENERAL_CATEGORY_LETTER_NUMBER;
   case U_OTHER_NUMBER:			return HB_UNICODE_GENERAL_CATEGORY_OTHER_NUMBER;
   case U_SPACE_SEPARATOR:		return HB_UNICODE_GENERAL_CATEGORY_SPACE_SEPARATOR;
   case U_LINE_SEPARATOR:		return HB_UNICODE_GENERAL_CATEGORY_LINE_SEPARATOR;
   case U_PARAGRAPH_SEPARATOR:		return HB_UNICODE_GENERAL_CATEGORY_PARAGRAPH_SEPARATOR;
   case U_CONTROL_CHAR:			return HB_UNICODE_GENERAL_CATEGORY_CONTROL;
   case U_FORMAT_CHAR:			return HB_UNICODE_GENERAL_CATEGORY_FORMAT;
   case U_PRIVATE_USE_CHAR:		return HB_UNICODE_GENERAL_CATEGORY_PRIVATE_USE;
   case U_SURROGATE:			return HB_UNICODE_GENERAL_CATEGORY_SURROGATE;
   case U_DASH_PUNCTUATION:		return HB_UNICODE_GENERAL_CATEGORY_DASH_PUNCTUATION;
   case U_START_PUNCTUATION:		return HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION;
   case U_END_PUNCTUATION:		return HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION;
   case U_CONNECTOR_PUNCTUATION:		return HB_UNICODE_GENERAL_CATEGORY_CONNECT_PUNCTUATION;
   case U_OTHER_PUNCTUATION:		return HB_UNICODE_GENERAL_CATEGORY_OTHER_PUNCTUATION;
   case U_MATH_SYMBOL:			return HB_UNICODE_GENERAL_CATEGORY_MATH_SYMBOL;
   case U_CURRENCY_SYMBOL:		return HB_UNICODE_GENERAL_CATEGORY_CURRENCY_SYMBOL;
   case U_MODIFIER_SYMBOL:		return HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL;
   case U_OTHER_SYMBOL:			return HB_UNICODE_GENERAL_CATEGORY_OTHER_SYMBOL;
   case U_INITIAL_PUNCTUATION:		return HB_UNICODE_GENERAL_CATEGORY_INITIAL_PUNCTUATION;
   case U_FINAL_PUNCTUATION:		return HB_UNICODE_GENERAL_CATEGORY_FINAL_PUNCTUATION;
   }
   return HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED;
 }
 static hb_codepoint_t
 hb_icu_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 			  hb_codepoint_t      unicode,
 			  void               *user_data HB_UNUSED)
 {
   return u_charMirror(unicode);
 }
 static hb_script_t
 hb_icu_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 		       hb_codepoint_t      unicode,
 		       void               *user_data HB_UNUSED)
 {
   UErrorCode status = U_ZERO_ERROR;
   UScriptCode scriptCode = uscript_getScript(unicode, &status);
   if (unlikely (U_FAILURE (status)))
     return HB_SCRIPT_UNKNOWN;
   return hb_icu_script_to_script (scriptCode);
 }
 #if U_ICU_VERSION_MAJOR_NUM >= 49
 static const UNormalizer2 *normalizer;
 #endif
 static hb_bool_t
 hb_icu_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 			hb_codepoint_t      a,
 			hb_codepoint_t      b,
 			hb_codepoint_t     *ab,
 			void               *user_data HB_UNUSED)
 {
 #if U_ICU_VERSION_MAJOR_NUM >= 49
   {
     UChar32 ret = unorm2_composePair (normalizer, a, b);
     if (ret < 0) return false;
     *ab = ret;
     return true;
   }
 #endif
   /* We don't ifdef-out the fallback code such that compiler always
    * sees it and makes sure it's compilable. */
   UChar utf16[4], normalized[5];
   unsigned int len;
   hb_bool_t ret, err;
   UErrorCode icu_err;
   len = 0;
   err = false;
   U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), a, err);
   if (err) return false;
   U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), b, err);
   if (err) return false;
   icu_err = U_ZERO_ERROR;
   len = unorm_normalize (utf16, len, UNORM_NFC, 0, normalized, ARRAY_LENGTH (normalized), &icu_err);
   if (U_FAILURE (icu_err))
     return false;
   if (u_countChar32 (normalized, len) == 1) {
     U16_GET_UNSAFE (normalized, 0, *ab);
     ret = true;
   } else {
     ret = false;
   }
   return ret;
 }
 static hb_bool_t
 hb_icu_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 			  hb_codepoint_t      ab,
 			  hb_codepoint_t     *a,
 			  hb_codepoint_t     *b,
 			  void               *user_data HB_UNUSED)
 {
 #if U_ICU_VERSION_MAJOR_NUM >= 49
   {
     UChar decomposed[4];
     int len;
     UErrorCode icu_err = U_ZERO_ERROR;
     len = unorm2_getRawDecomposition (normalizer, ab, decomposed,
 				      ARRAY_LENGTH (decomposed), &icu_err);
     if (U_FAILURE (icu_err) || len < 0) return false;
     len = u_countChar32 (decomposed, len);
     if (len == 1) {
       U16_GET_UNSAFE (decomposed, 0, *a);
       *b = 0;
       return *a != ab;
     } else if (len == 2) {
       len =0;
       U16_NEXT_UNSAFE (decomposed, len, *a);
       U16_NEXT_UNSAFE (decomposed, len, *b);
     }
     return true;
   }
 #endif
   /* We don't ifdef-out the fallback code such that compiler always
    * sees it and makes sure it's compilable. */
   UChar utf16[2], normalized[2 * HB_UNICODE_MAX_DECOMPOSITION_LEN + 1];
   unsigned int len;
   hb_bool_t ret, err;
   UErrorCode icu_err;
   /* This function is a monster! Maybe it wasn't a good idea adding a
    * pairwise decompose API... */
   /* Watchout for the dragons.  Err, watchout for macros changing len. */
   len = 0;
   err = false;
   U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), ab, err);
   if (err) return false;
   icu_err = U_ZERO_ERROR;
   len = unorm_normalize (utf16, len, UNORM_NFD, 0, normalized, ARRAY_LENGTH (normalized), &icu_err);
   if (U_FAILURE (icu_err))
     return false;
   len = u_countChar32 (normalized, len);
   if (len == 1) {
     U16_GET_UNSAFE (normalized, 0, *a);
     *b = 0;
     ret = *a != ab;
   } else if (len == 2) {
     len =0;
     U16_NEXT_UNSAFE (normalized, len, *a);
     U16_NEXT_UNSAFE (normalized, len, *b);
     /* Here's the ugly part: if ab decomposes to a single character and
      * that character decomposes again, we have to detect that and undo
      * the second part :-(. */
     UChar recomposed[20];
     icu_err = U_ZERO_ERROR;
     unorm_normalize (normalized, len, UNORM_NFC, 0, recomposed, ARRAY_LENGTH (recomposed), &icu_err);
     if (U_FAILURE (icu_err))
       return false;
     hb_codepoint_t c;
     U16_GET_UNSAFE (recomposed, 0, c);
     if (c != *a && c != ab) {
       *a = c;
       *b = 0;
     }
     ret = true;
   } else {
     /* If decomposed to more than two characters, take the last one,
      * and recompose the rest to get the first component. */
     U16_PREV_UNSAFE (normalized, len, *b); /* Changes len in-place. */
     UChar recomposed[18 * 2];
     icu_err = U_ZERO_ERROR;
     len = unorm_normalize (normalized, len, UNORM_NFC, 0, recomposed, ARRAY_LENGTH (recomposed), &icu_err);
     if (U_FAILURE (icu_err))
       return false;
     /* We expect that recomposed has exactly one character now. */
     if (unlikely (u_countChar32 (recomposed, len) != 1))
       return false;
     U16_GET_UNSAFE (recomposed, 0, *a);
     ret = true;
   }
   return ret;
 }
 static unsigned int
 hb_icu_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs HB_UNUSED,
 					hb_codepoint_t      u,
 					hb_codepoint_t     *decomposed,
 					void               *user_data HB_UNUSED)
 {
   UChar utf16[2], normalized[2 * HB_UNICODE_MAX_DECOMPOSITION_LEN + 1];
   unsigned int len;
   int32_t utf32_len;
   hb_bool_t err;
   UErrorCode icu_err;
   /* Copy @u into a UTF-16 array to be passed to ICU. */
   len = 0;
   err = FALSE;
   U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), u, err);
   if (err)
     return 0;
   /* Normalise the codepoint using NFKD mode. */
   icu_err = U_ZERO_ERROR;
   len = unorm_normalize (utf16, len, UNORM_NFKD, 0, normalized, ARRAY_LENGTH (normalized), &icu_err);
   if (icu_err)
     return 0;
   /* Convert the decomposed form from UTF-16 to UTF-32. */
   icu_err = U_ZERO_ERROR;
   u_strToUTF32 ((UChar32*) decomposed, HB_UNICODE_MAX_DECOMPOSITION_LEN, &utf32_len, normalized, len, &icu_err);
   if (icu_err)
     return 0;
   return utf32_len;
 }
 hb_unicode_funcs_t *
 hb_icu_get_unicode_funcs (void)
 {
   static const hb_unicode_funcs_t _hb_icu_unicode_funcs = {
     HB_OBJECT_HEADER_STATIC,
     NULL, /* parent */
     true, /* immutable */
     {
 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_icu_unicode_##name,
       HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_UNICODE_FUNC_IMPLEMENT
     }
   };
 #if U_ICU_VERSION_MAJOR_NUM >= 49
   if (!hb_atomic_ptr_get (&normalizer)) {
     UErrorCode icu_err = U_ZERO_ERROR;
     /* We ignore failure in getNFCInstace(). */
     hb_atomic_ptr_cmpexch (&normalizer, NULL, unorm2_getNFCInstance (&icu_err));
   }
 #endif
   return const_cast<hb_unicode_funcs_t *> (&_hb_icu_unicode_funcs);
 }

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

gfx/harfbuzz/src/hb-icu.cc