HarfBuzz text shaping engine
http://harfbuzz.github.io/
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294 lines
9.1 KiB
294 lines
9.1 KiB
/* |
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* Copyright © 2009 Red Hat, Inc. |
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* Copyright © 2009 Keith Stribley |
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* Copyright © 2011 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Red Hat Author(s): Behdad Esfahbod |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#include "hb-private.hh" |
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#include "hb-icu.h" |
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#include "hb-unicode-private.hh" |
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#include <unicode/uversion.h> |
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#include <unicode/uchar.h> |
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#include <unicode/unorm.h> |
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#include <unicode/ustring.h> |
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hb_script_t |
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hb_icu_script_to_script (UScriptCode script) |
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{ |
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if (unlikely (script == USCRIPT_INVALID_CODE)) |
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return HB_SCRIPT_INVALID; |
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return hb_script_from_string (uscript_getShortName (script), -1); |
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} |
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UScriptCode |
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hb_icu_script_from_script (hb_script_t script) |
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{ |
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if (unlikely (script == HB_SCRIPT_INVALID)) |
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return USCRIPT_INVALID_CODE; |
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for (unsigned int i = 0; i < USCRIPT_CODE_LIMIT; i++) |
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if (unlikely (hb_icu_script_to_script ((UScriptCode) i) == script)) |
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return (UScriptCode) i; |
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return USCRIPT_UNKNOWN; |
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} |
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static unsigned int |
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hb_icu_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED, |
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hb_codepoint_t unicode, |
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void *user_data HB_UNUSED) |
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{ |
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return u_getCombiningClass (unicode); |
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} |
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static unsigned int |
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hb_icu_unicode_eastasian_width (hb_unicode_funcs_t *ufuncs HB_UNUSED, |
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hb_codepoint_t unicode, |
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void *user_data HB_UNUSED) |
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{ |
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switch (u_getIntPropertyValue(unicode, UCHAR_EAST_ASIAN_WIDTH)) |
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{ |
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case U_EA_WIDE: |
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case U_EA_FULLWIDTH: |
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return 2; |
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case U_EA_NEUTRAL: |
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case U_EA_AMBIGUOUS: |
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case U_EA_HALFWIDTH: |
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case U_EA_NARROW: |
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return 1; |
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} |
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return 1; |
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} |
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static hb_unicode_general_category_t |
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hb_icu_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED, |
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hb_codepoint_t unicode, |
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void *user_data HB_UNUSED) |
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{ |
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switch (u_getIntPropertyValue(unicode, UCHAR_GENERAL_CATEGORY)) |
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{ |
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case U_UNASSIGNED: return HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED; |
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case U_UPPERCASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_UPPERCASE_LETTER; |
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case U_LOWERCASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER; |
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case U_TITLECASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_TITLECASE_LETTER; |
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case U_MODIFIER_LETTER: return HB_UNICODE_GENERAL_CATEGORY_MODIFIER_LETTER; |
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case U_OTHER_LETTER: return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER; |
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case U_NON_SPACING_MARK: return HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK; |
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case U_ENCLOSING_MARK: return HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK; |
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case U_COMBINING_SPACING_MARK: return HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK; |
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case U_DECIMAL_DIGIT_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER; |
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case U_LETTER_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_LETTER_NUMBER; |
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case U_OTHER_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_OTHER_NUMBER; |
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case U_SPACE_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_SPACE_SEPARATOR; |
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case U_LINE_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_LINE_SEPARATOR; |
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case U_PARAGRAPH_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_PARAGRAPH_SEPARATOR; |
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case U_CONTROL_CHAR: return HB_UNICODE_GENERAL_CATEGORY_CONTROL; |
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case U_FORMAT_CHAR: return HB_UNICODE_GENERAL_CATEGORY_FORMAT; |
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case U_PRIVATE_USE_CHAR: return HB_UNICODE_GENERAL_CATEGORY_PRIVATE_USE; |
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case U_SURROGATE: return HB_UNICODE_GENERAL_CATEGORY_SURROGATE; |
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case U_DASH_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_DASH_PUNCTUATION; |
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case U_START_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION; |
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case U_END_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION; |
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case U_CONNECTOR_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_CONNECT_PUNCTUATION; |
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case U_OTHER_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_OTHER_PUNCTUATION; |
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case U_MATH_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_MATH_SYMBOL; |
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case U_CURRENCY_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_CURRENCY_SYMBOL; |
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case U_MODIFIER_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL; |
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case U_OTHER_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_OTHER_SYMBOL; |
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case U_INITIAL_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_INITIAL_PUNCTUATION; |
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case U_FINAL_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_FINAL_PUNCTUATION; |
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} |
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return HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED; |
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} |
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static hb_codepoint_t |
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hb_icu_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED, |
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hb_codepoint_t unicode, |
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void *user_data HB_UNUSED) |
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{ |
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return u_charMirror(unicode); |
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} |
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static hb_script_t |
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hb_icu_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED, |
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hb_codepoint_t unicode, |
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void *user_data HB_UNUSED) |
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{ |
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UErrorCode status = U_ZERO_ERROR; |
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UScriptCode scriptCode = uscript_getScript(unicode, &status); |
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if (unlikely (U_FAILURE (status))) |
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return HB_SCRIPT_UNKNOWN; |
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return hb_icu_script_to_script (scriptCode); |
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} |
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static hb_bool_t |
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hb_icu_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED, |
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hb_codepoint_t a, |
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hb_codepoint_t b, |
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hb_codepoint_t *ab, |
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void *user_data HB_UNUSED) |
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{ |
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if (!a || !b) |
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return false; |
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UChar utf16[4], normalized[5]; |
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int len; |
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hb_bool_t ret, err; |
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UErrorCode icu_err; |
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len = 0; |
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err = false; |
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U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), a, err); |
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if (err) return false; |
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U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), b, err); |
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if (err) return false; |
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icu_err = U_ZERO_ERROR; |
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len = unorm_normalize (utf16, len, UNORM_NFC, 0, normalized, ARRAY_LENGTH (normalized), &icu_err); |
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if (U_FAILURE (icu_err)) |
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return false; |
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if (u_countChar32 (normalized, len) == 1) { |
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U16_GET_UNSAFE (normalized, 0, *ab); |
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ret = true; |
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} else { |
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ret = false; |
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} |
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return ret; |
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} |
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static hb_bool_t |
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hb_icu_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED, |
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hb_codepoint_t ab, |
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hb_codepoint_t *a, |
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hb_codepoint_t *b, |
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void *user_data HB_UNUSED) |
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{ |
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UChar utf16[2], normalized[20]; |
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int len; |
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hb_bool_t ret, err; |
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UErrorCode icu_err; |
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/* This function is a monster! Maybe it wasn't a good idea adding a |
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* pairwise decompose API... */ |
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/* Watchout for the dragons. Err, watchout for macros changing len. */ |
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len = 0; |
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err = false; |
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U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), ab, err); |
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if (err) return false; |
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icu_err = U_ZERO_ERROR; |
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len = unorm_normalize (utf16, len, UNORM_NFD, 0, normalized, ARRAY_LENGTH (normalized), &icu_err); |
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if (U_FAILURE (icu_err)) |
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return false; |
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len = u_countChar32 (normalized, len); |
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if (len == 1) { |
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U16_GET_UNSAFE (normalized, 0, *a); |
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*b = 0; |
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ret = *a != ab; |
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} else if (len == 2) { |
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len =0; |
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U16_NEXT_UNSAFE (normalized, len, *a); |
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U16_NEXT_UNSAFE (normalized, len, *b); |
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/* Here's the ugly part: if ab decomposes to a single character and |
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* that character decomposes again, we have to detect that and undo |
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* the second part :-(. */ |
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UChar recomposed[20]; |
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icu_err = U_ZERO_ERROR; |
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unorm_normalize (normalized, len, UNORM_NFC, 0, recomposed, ARRAY_LENGTH (recomposed), &icu_err); |
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if (U_FAILURE (icu_err)) |
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return false; |
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hb_codepoint_t c; |
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U16_GET_UNSAFE (recomposed, 0, c); |
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if (c != *a && c != ab) { |
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*a = c; |
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*b = 0; |
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} |
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ret = true; |
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} else { |
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/* If decomposed to more than two characters, take the last one, |
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* and recompose the rest to get the first component. */ |
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U16_PREV_UNSAFE (normalized, len, *b); /* Changes len in-place. */ |
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UChar recomposed[18 * 2]; |
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icu_err = U_ZERO_ERROR; |
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len = unorm_normalize (normalized, len, UNORM_NFC, 0, recomposed, ARRAY_LENGTH (recomposed), &icu_err); |
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if (U_FAILURE (icu_err)) |
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return false; |
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/* We expect that recomposed has exactly one character now. */ |
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if (unlikely (u_countChar32 (recomposed, len) != 1)) |
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return false; |
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U16_GET_UNSAFE (recomposed, 0, *a); |
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ret = true; |
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} |
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return ret; |
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} |
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extern HB_INTERNAL const hb_unicode_funcs_t _hb_icu_unicode_funcs; |
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const hb_unicode_funcs_t _hb_icu_unicode_funcs = { |
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HB_OBJECT_HEADER_STATIC, |
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NULL, /* parent */ |
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true, /* immutable */ |
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{ |
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#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_icu_unicode_##name, |
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HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS |
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#undef HB_UNICODE_FUNC_IMPLEMENT |
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} |
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}; |
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hb_unicode_funcs_t * |
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hb_icu_get_unicode_funcs (void) |
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{ |
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return const_cast<hb_unicode_funcs_t *> (&_hb_icu_unicode_funcs); |
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} |
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