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Diffstat (limited to 'gfx/harfbuzz/src/hb-icu.cc')
| -rw-r--r-- | gfx/harfbuzz/src/hb-icu.cc | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-icu.cc b/gfx/harfbuzz/src/hb-icu.cc new file mode 100644 index 000000000..ee54721fd --- /dev/null +++ b/gfx/harfbuzz/src/hb-icu.cc @@ -0,0 +1,371 @@ +/* + * 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/utf16.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(). */ + (void) hb_atomic_ptr_cmpexch (&normalizer, NULL, unorm2_getNFCInstance (&icu_err)); + } +#endif + return const_cast<hb_unicode_funcs_t *> (&_hb_icu_unicode_funcs); +} |