author | prr |
Mon, 23 Nov 2015 09:58:44 -0800 | |
changeset 34414 | e496a8d8fc8a |
child 40435 | 553eb1a50733 |
permissions | -rw-r--r-- |
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/* |
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* Copyright © 2009 Red Hat, Inc. |
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* Copyright © 2011 Codethink Limited |
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* Copyright © 2010,2011,2012 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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* Codethink Author(s): Ryan Lortie |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_UNICODE_PRIVATE_HH |
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#define HB_UNICODE_PRIVATE_HH |
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#include "hb-private.hh" |
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#include "hb-object-private.hh" |
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extern HB_INTERNAL const uint8_t _hb_modified_combining_class[256]; |
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/* |
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* hb_unicode_funcs_t |
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*/ |
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#define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS \ |
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HB_UNICODE_FUNC_IMPLEMENT (combining_class) \ |
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HB_UNICODE_FUNC_IMPLEMENT (eastasian_width) \ |
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HB_UNICODE_FUNC_IMPLEMENT (general_category) \ |
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HB_UNICODE_FUNC_IMPLEMENT (mirroring) \ |
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HB_UNICODE_FUNC_IMPLEMENT (script) \ |
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HB_UNICODE_FUNC_IMPLEMENT (compose) \ |
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HB_UNICODE_FUNC_IMPLEMENT (decompose) \ |
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HB_UNICODE_FUNC_IMPLEMENT (decompose_compatibility) \ |
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/* ^--- Add new callbacks here */ |
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/* Simple callbacks are those taking a hb_codepoint_t and returning a hb_codepoint_t */ |
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#define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE \ |
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HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_combining_class_t, combining_class) \ |
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HB_UNICODE_FUNC_IMPLEMENT (unsigned int, eastasian_width) \ |
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HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_general_category_t, general_category) \ |
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HB_UNICODE_FUNC_IMPLEMENT (hb_codepoint_t, mirroring) \ |
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HB_UNICODE_FUNC_IMPLEMENT (hb_script_t, script) \ |
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/* ^--- Add new simple callbacks here */ |
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struct hb_unicode_funcs_t { |
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hb_object_header_t header; |
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ASSERT_POD (); |
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hb_unicode_funcs_t *parent; |
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bool immutable; |
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#define HB_UNICODE_FUNC_IMPLEMENT(return_type, name) \ |
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inline return_type name (hb_codepoint_t unicode) { return func.name (this, unicode, user_data.name); } |
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HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE |
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#undef HB_UNICODE_FUNC_IMPLEMENT |
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inline hb_bool_t compose (hb_codepoint_t a, hb_codepoint_t b, |
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hb_codepoint_t *ab) |
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{ |
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*ab = 0; |
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if (unlikely (!a || !b)) return false; |
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return func.compose (this, a, b, ab, user_data.compose); |
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} |
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inline hb_bool_t decompose (hb_codepoint_t ab, |
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hb_codepoint_t *a, hb_codepoint_t *b) |
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{ |
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*a = ab; *b = 0; |
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return func.decompose (this, ab, a, b, user_data.decompose); |
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} |
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inline unsigned int decompose_compatibility (hb_codepoint_t u, |
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hb_codepoint_t *decomposed) |
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{ |
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unsigned int ret = func.decompose_compatibility (this, u, decomposed, user_data.decompose_compatibility); |
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if (ret == 1 && u == decomposed[0]) { |
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decomposed[0] = 0; |
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return 0; |
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} |
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decomposed[ret] = 0; |
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return ret; |
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} |
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inline unsigned int |
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modified_combining_class (hb_codepoint_t unicode) |
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{ |
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/* XXX This hack belongs to the Myanmar shaper. */ |
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if (unlikely (unicode == 0x1037u)) unicode = 0x103Au; |
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/* XXX This hack belongs to the SEA shaper (for Tai Tham): |
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* Reorder SAKOT to ensure it comes after any tone marks. */ |
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if (unlikely (unicode == 0x1A60u)) return 254; |
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/* XXX This hack belongs to the Tibetan shaper: |
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* Reorder PADMA to ensure it comes after any vowel marks. */ |
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if (unlikely (unicode == 0x0FC6u)) return 254; |
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return _hb_modified_combining_class[combining_class (unicode)]; |
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120 |
} |
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121 |
|
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122 |
static inline hb_bool_t |
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123 |
is_variation_selector (hb_codepoint_t unicode) |
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124 |
{ |
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125 |
/* U+180B..180D MONGOLIAN FREE VARIATION SELECTORs are handled in the |
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126 |
* Arabic shaper. No need to match them here. */ |
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127 |
return unlikely (hb_in_ranges (unicode, |
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128 |
0xFE00u, 0xFE0Fu, /* VARIATION SELECTOR-1..16 */ |
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129 |
0xE0100u, 0xE01EFu)); /* VARIATION SELECTOR-17..256 */ |
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130 |
} |
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131 |
|
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132 |
/* Default_Ignorable codepoints: |
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133 |
* |
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134 |
* Note: While U+115F, U+1160, U+3164 and U+FFA0 are Default_Ignorable, |
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135 |
* we do NOT want to hide them, as the way Uniscribe has implemented them |
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136 |
* is with regular spacing glyphs, and that's the way fonts are made to work. |
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137 |
* As such, we make exceptions for those four. |
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138 |
* |
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139 |
* Unicode 7.0: |
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140 |
* $ grep '; Default_Ignorable_Code_Point ' DerivedCoreProperties.txt | sed 's/;.*#/#/' |
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141 |
* 00AD # Cf SOFT HYPHEN |
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142 |
* 034F # Mn COMBINING GRAPHEME JOINER |
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143 |
* 061C # Cf ARABIC LETTER MARK |
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144 |
* 115F..1160 # Lo [2] HANGUL CHOSEONG FILLER..HANGUL JUNGSEONG FILLER |
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145 |
* 17B4..17B5 # Mn [2] KHMER VOWEL INHERENT AQ..KHMER VOWEL INHERENT AA |
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146 |
* 180B..180D # Mn [3] MONGOLIAN FREE VARIATION SELECTOR ONE..MONGOLIAN FREE VARIATION SELECTOR THREE |
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147 |
* 180E # Cf MONGOLIAN VOWEL SEPARATOR |
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148 |
* 200B..200F # Cf [5] ZERO WIDTH SPACE..RIGHT-TO-LEFT MARK |
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149 |
* 202A..202E # Cf [5] LEFT-TO-RIGHT EMBEDDING..RIGHT-TO-LEFT OVERRIDE |
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150 |
* 2060..2064 # Cf [5] WORD JOINER..INVISIBLE PLUS |
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151 |
* 2065 # Cn <reserved-2065> |
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152 |
* 2066..206F # Cf [10] LEFT-TO-RIGHT ISOLATE..NOMINAL DIGIT SHAPES |
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153 |
* 3164 # Lo HANGUL FILLER |
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154 |
* FE00..FE0F # Mn [16] VARIATION SELECTOR-1..VARIATION SELECTOR-16 |
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155 |
* FEFF # Cf ZERO WIDTH NO-BREAK SPACE |
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156 |
* FFA0 # Lo HALFWIDTH HANGUL FILLER |
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157 |
* FFF0..FFF8 # Cn [9] <reserved-FFF0>..<reserved-FFF8> |
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158 |
* 1BCA0..1BCA3 # Cf [4] SHORTHAND FORMAT LETTER OVERLAP..SHORTHAND FORMAT UP STEP |
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159 |
* 1D173..1D17A # Cf [8] MUSICAL SYMBOL BEGIN BEAM..MUSICAL SYMBOL END PHRASE |
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160 |
* E0000 # Cn <reserved-E0000> |
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161 |
* E0001 # Cf LANGUAGE TAG |
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162 |
* E0002..E001F # Cn [30] <reserved-E0002>..<reserved-E001F> |
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163 |
* E0020..E007F # Cf [96] TAG SPACE..CANCEL TAG |
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164 |
* E0080..E00FF # Cn [128] <reserved-E0080>..<reserved-E00FF> |
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165 |
* E0100..E01EF # Mn [240] VARIATION SELECTOR-17..VARIATION SELECTOR-256 |
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166 |
* E01F0..E0FFF # Cn [3600] <reserved-E01F0>..<reserved-E0FFF> |
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167 |
*/ |
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168 |
static inline hb_bool_t |
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169 |
is_default_ignorable (hb_codepoint_t ch) |
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170 |
{ |
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171 |
hb_codepoint_t plane = ch >> 16; |
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172 |
if (likely (plane == 0)) |
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173 |
{ |
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|
174 |
/* BMP */ |
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175 |
hb_codepoint_t page = ch >> 8; |
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176 |
switch (page) { |
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177 |
case 0x00: return unlikely (ch == 0x00ADu); |
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|
178 |
case 0x03: return unlikely (ch == 0x034Fu); |
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179 |
case 0x06: return unlikely (ch == 0x061Cu); |
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180 |
case 0x17: return hb_in_range (ch, 0x17B4u, 0x17B5u); |
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181 |
case 0x18: return hb_in_range (ch, 0x180Bu, 0x180Eu); |
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182 |
case 0x20: return hb_in_ranges (ch, 0x200Bu, 0x200Fu, |
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183 |
0x202Au, 0x202Eu, |
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|
184 |
0x2060u, 0x206Fu); |
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|
185 |
case 0xFE: return hb_in_range (ch, 0xFE00u, 0xFE0Fu) || ch == 0xFEFFu; |
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186 |
case 0xFF: return hb_in_range (ch, 0xFFF0u, 0xFFF8u); |
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187 |
default: return false; |
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|
188 |
} |
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189 |
} |
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|
190 |
else |
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191 |
{ |
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|
192 |
/* Other planes */ |
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|
193 |
switch (plane) { |
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|
194 |
case 0x01: return hb_in_ranges (ch, 0x1BCA0u, 0x1BCA3u, |
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|
195 |
0x1D173u, 0x1D17Au); |
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|
196 |
case 0x0E: return hb_in_range (ch, 0xE0000u, 0xE0FFFu); |
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|
197 |
default: return false; |
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|
198 |
} |
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|
199 |
} |
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|
200 |
} |
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|
201 |
|
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|
202 |
|
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203 |
struct { |
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|
204 |
#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_func_t name; |
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|
205 |
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS |
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|
206 |
#undef HB_UNICODE_FUNC_IMPLEMENT |
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|
207 |
} func; |
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|
208 |
|
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209 |
struct { |
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210 |
#define HB_UNICODE_FUNC_IMPLEMENT(name) void *name; |
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211 |
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS |
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212 |
#undef HB_UNICODE_FUNC_IMPLEMENT |
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|
213 |
} user_data; |
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|
214 |
|
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215 |
struct { |
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216 |
#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_destroy_func_t name; |
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|
217 |
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS |
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218 |
#undef HB_UNICODE_FUNC_IMPLEMENT |
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|
219 |
} destroy; |
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|
220 |
}; |
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221 |
|
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222 |
|
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223 |
extern HB_INTERNAL const hb_unicode_funcs_t _hb_unicode_funcs_nil; |
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224 |
|
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225 |
|
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|
226 |
/* Modified combining marks */ |
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|
227 |
|
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|
228 |
/* Hebrew |
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|
229 |
* |
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|
230 |
* We permute the "fixed-position" classes 10-26 into the order |
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|
231 |
* described in the SBL Hebrew manual: |
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232 |
* |
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233 |
* http://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf |
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234 |
* |
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235 |
* (as recommended by: |
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236 |
* http://forum.fontlab.com/archive-old-microsoft-volt-group/vista-and-diacritic-ordering-t6751.0.html) |
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* |
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* More details here: |
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* https://bugzilla.mozilla.org/show_bug.cgi?id=662055 |
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*/ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC10 22 /* sheva */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC11 15 /* hataf segol */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC12 16 /* hataf patah */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC13 17 /* hataf qamats */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC14 23 /* hiriq */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC15 18 /* tsere */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC16 19 /* segol */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC17 20 /* patah */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC18 21 /* qamats */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC19 14 /* holam */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC20 24 /* qubuts */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC21 12 /* dagesh */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC22 25 /* meteg */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC23 13 /* rafe */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC24 10 /* shin dot */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC25 11 /* sin dot */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC26 26 /* point varika */ |
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|
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/* |
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* Arabic |
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* |
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* Modify to move Shadda (ccc=33) before other marks. See: |
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* http://unicode.org/faq/normalization.html#8 |
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* http://unicode.org/faq/normalization.html#9 |
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*/ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC27 28 /* fathatan */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC28 29 /* dammatan */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC29 30 /* kasratan */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC30 31 /* fatha */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC31 32 /* damma */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC32 33 /* kasra */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC33 27 /* shadda */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC34 34 /* sukun */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC35 35 /* superscript alef */ |
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|
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/* Syriac */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC36 36 /* superscript alaph */ |
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/* Telugu |
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* |
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* Modify Telugu length marks (ccc=84, ccc=91). |
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* These are the only matras in the main Indic scripts range that have |
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* a non-zero ccc. That makes them reorder with the Halant that is |
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* ccc=9. Just zero them, we don't need them in our Indic shaper. |
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*/ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC84 0 /* length mark */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC91 0 /* ai length mark */ |
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/* Thai |
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* |
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* Modify U+0E38 and U+0E39 (ccc=103) to be reordered before U+0E3A (ccc=9). |
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* Assign 3, which is unassigned otherwise. |
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* Uniscribe does this reordering too. |
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*/ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC103 3 /* sara u / sara uu */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC107 107 /* mai * */ |
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/* Lao */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC118 118 /* sign u / sign uu */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC122 122 /* mai * */ |
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/* Tibetan */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC129 129 /* sign aa */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC130 130 /* sign i */ |
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#define HB_MODIFIED_COMBINING_CLASS_CCC132 132 /* sign u */ |
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|
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/* Misc */ |
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#define HB_UNICODE_GENERAL_CATEGORY_IS_MARK(gen_cat) \ |
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(FLAG_SAFE (gen_cat) & \ |
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(FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \ |
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FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | \ |
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FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK))) |
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|
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#endif /* HB_UNICODE_PRIVATE_HH */ |