1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/generic/MathMLTextRunFactory.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,730 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "MathMLTextRunFactory.h"
1.10 +
1.11 +#include "mozilla/ArrayUtils.h"
1.12 +
1.13 +#include "nsStyleConsts.h"
1.14 +#include "nsStyleContext.h"
1.15 +#include "nsTextFrameUtils.h"
1.16 +
1.17 +using namespace mozilla;
1.18 +
1.19 +/*
1.20 + Entries for the mathvariant lookup tables. mKey represents the Unicode
1.21 + character to be transformed and is used for searching the tables.
1.22 + mReplacement represents the mapped mathvariant Unicode character.
1.23 +*/
1.24 +typedef struct
1.25 +{
1.26 + uint32_t mKey;
1.27 + uint32_t mReplacement;
1.28 +} MathVarMapping;
1.29 +
1.30 +/*
1.31 + Lookup tables for use with mathvariant mappings to transform a unicode
1.32 + character point to another unicode character that indicates the proper output.
1.33 + mKey represents one of two concepts.
1.34 + 1. In the Latin table it represents a hole in the mathematical alphanumeric
1.35 + block, where the character that should occupy that position is located
1.36 + elsewhere.
1.37 + 2. It represents an Arabic letter.
1.38 +
1.39 + As a replacement, 0 is reserved to indicate no mapping was found.
1.40 +*/
1.41 +static const MathVarMapping gArabicInitialMapTable[] = {
1.42 + { 0x628, 0x1EE21 },
1.43 + { 0x62A, 0x1EE35 },
1.44 + { 0x62B, 0x1EE36 },
1.45 + { 0x62C, 0x1EE22 },
1.46 + { 0x62D, 0x1EE27 },
1.47 + { 0x62E, 0x1EE37 },
1.48 + { 0x633, 0x1EE2E },
1.49 + { 0x634, 0x1EE34 },
1.50 + { 0x635, 0x1EE31 },
1.51 + { 0x636, 0x1EE39 },
1.52 + { 0x639, 0x1EE2F },
1.53 + { 0x63A, 0x1EE3B },
1.54 + { 0x641, 0x1EE30 },
1.55 + { 0x642, 0x1EE32 },
1.56 + { 0x643, 0x1EE2A },
1.57 + { 0x644, 0x1EE2B },
1.58 + { 0x645, 0x1EE2C },
1.59 + { 0x646, 0x1EE2D },
1.60 + { 0x647, 0x1EE24 },
1.61 + { 0x64A, 0x1EE29 }
1.62 +};
1.63 +
1.64 +static const MathVarMapping gArabicTailedMapTable[] = {
1.65 + { 0x62C, 0x1EE42 },
1.66 + { 0x62D, 0x1EE47 },
1.67 + { 0x62E, 0x1EE57 },
1.68 + { 0x633, 0x1EE4E },
1.69 + { 0x634, 0x1EE54 },
1.70 + { 0x635, 0x1EE51 },
1.71 + { 0x636, 0x1EE59 },
1.72 + { 0x639, 0x1EE4F },
1.73 + { 0x63A, 0x1EE5B },
1.74 + { 0x642, 0x1EE52 },
1.75 + { 0x644, 0x1EE4B },
1.76 + { 0x646, 0x1EE4D },
1.77 + { 0x64A, 0x1EE49 },
1.78 + { 0x66F, 0x1EE5F },
1.79 + { 0x6BA, 0x1EE5D }
1.80 +};
1.81 +
1.82 +static const MathVarMapping gArabicStretchedMapTable[] = {
1.83 + { 0x628, 0x1EE61 },
1.84 + { 0x62A, 0x1EE75 },
1.85 + { 0x62B, 0x1EE76 },
1.86 + { 0x62C, 0x1EE62 },
1.87 + { 0x62D, 0x1EE67 },
1.88 + { 0x62E, 0x1EE77 },
1.89 + { 0x633, 0x1EE6E },
1.90 + { 0x634, 0x1EE74 },
1.91 + { 0x635, 0x1EE71 },
1.92 + { 0x636, 0x1EE79 },
1.93 + { 0x637, 0x1EE68 },
1.94 + { 0x638, 0x1EE7A },
1.95 + { 0x639, 0x1EE6F },
1.96 + { 0x63A, 0x1EE7B },
1.97 + { 0x641, 0x1EE70 },
1.98 + { 0x642, 0x1EE72 },
1.99 + { 0x643, 0x1EE6A },
1.100 + { 0x645, 0x1EE6C },
1.101 + { 0x646, 0x1EE6D },
1.102 + { 0x647, 0x1EE64 },
1.103 + { 0x64A, 0x1EE69 },
1.104 + { 0x66E, 0x1EE7C },
1.105 + { 0x6A1, 0x1EE7E }
1.106 +};
1.107 +
1.108 +static const MathVarMapping gArabicLoopedMapTable[] = {
1.109 + { 0x627, 0x1EE80 },
1.110 + { 0x628, 0x1EE81 },
1.111 + { 0x62A, 0x1EE95 },
1.112 + { 0x62B, 0x1EE96 },
1.113 + { 0x62C, 0x1EE82 },
1.114 + { 0x62D, 0x1EE87 },
1.115 + { 0x62E, 0x1EE97 },
1.116 + { 0x62F, 0x1EE83 },
1.117 + { 0x630, 0x1EE98 },
1.118 + { 0x631, 0x1EE93 },
1.119 + { 0x632, 0x1EE86 },
1.120 + { 0x633, 0x1EE8E },
1.121 + { 0x634, 0x1EE94 },
1.122 + { 0x635, 0x1EE91 },
1.123 + { 0x636, 0x1EE99 },
1.124 + { 0x637, 0x1EE88 },
1.125 + { 0x638, 0x1EE9A },
1.126 + { 0x639, 0x1EE8F },
1.127 + { 0x63A, 0x1EE9B },
1.128 + { 0x641, 0x1EE90 },
1.129 + { 0x642, 0x1EE92 },
1.130 + { 0x644, 0x1EE8B },
1.131 + { 0x645, 0x1EE8C },
1.132 + { 0x646, 0x1EE8D },
1.133 + { 0x647, 0x1EE84 },
1.134 + { 0x648, 0x1EE85 },
1.135 + { 0x64A, 0x1EE89 }
1.136 +};
1.137 +
1.138 +static const MathVarMapping gArabicDoubleMapTable[] = {
1.139 + { 0x628, 0x1EEA1 },
1.140 + { 0x62A, 0x1EEB5 },
1.141 + { 0x62B, 0x1EEB6 },
1.142 + { 0x62C, 0x1EEA2 },
1.143 + { 0x62D, 0x1EEA7 },
1.144 + { 0x62E, 0x1EEB7 },
1.145 + { 0x62F, 0x1EEA3 },
1.146 + { 0x630, 0x1EEB8 },
1.147 + { 0x631, 0x1EEB3 },
1.148 + { 0x632, 0x1EEA6 },
1.149 + { 0x633, 0x1EEAE },
1.150 + { 0x634, 0x1EEB4 },
1.151 + { 0x635, 0x1EEB1 },
1.152 + { 0x636, 0x1EEB9 },
1.153 + { 0x637, 0x1EEA8 },
1.154 + { 0x638, 0x1EEBA },
1.155 + { 0x639, 0x1EEAF },
1.156 + { 0x63A, 0x1EEBB },
1.157 + { 0x641, 0x1EEB0 },
1.158 + { 0x642, 0x1EEB2 },
1.159 + { 0x644, 0x1EEAB },
1.160 + { 0x645, 0x1EEAC },
1.161 + { 0x646, 0x1EEAD },
1.162 + { 0x648, 0x1EEA5 },
1.163 + { 0x64A, 0x1EEA9 }
1.164 +};
1.165 +
1.166 +static const MathVarMapping gLatinExceptionMapTable[] = {
1.167 + { 0x1D455, 0x210E },
1.168 + { 0x1D49D, 0x212C },
1.169 + { 0x1D4A0, 0x2130 },
1.170 + { 0x1D4A1, 0x2131 },
1.171 + { 0x1D4A3, 0x210B },
1.172 + { 0x1D4A4, 0x2110 },
1.173 + { 0x1D4A7, 0x2112 },
1.174 + { 0x1D4A8, 0x2133 },
1.175 + { 0x1D4AD, 0x211B },
1.176 + { 0x1D4BA, 0x212F },
1.177 + { 0x1D4BC, 0x210A },
1.178 + { 0x1D4C4, 0x2134 },
1.179 + { 0x1D506, 0x212D },
1.180 + { 0x1D50B, 0x210C },
1.181 + { 0x1D50C, 0x2111 },
1.182 + { 0x1D515, 0x211C },
1.183 + { 0x1D51D, 0x2128 },
1.184 + { 0x1D53A, 0x2102 },
1.185 + { 0x1D53F, 0x210D },
1.186 + { 0x1D545, 0x2115 },
1.187 + { 0x1D547, 0x2119 },
1.188 + { 0x1D548, 0x211A },
1.189 + { 0x1D549, 0x211D },
1.190 + { 0x1D551, 0x2124 }
1.191 +};
1.192 +
1.193 +// Finds a MathVarMapping struct with the specified key (aKey) within aTable.
1.194 +// aTable must be an array, whose length is specified by aNumElements
1.195 +static uint32_t
1.196 +MathvarMappingSearch(uint32_t aKey, const MathVarMapping* aTable, uint32_t aNumElements)
1.197 +{
1.198 + uint32_t low = 0;
1.199 + uint32_t high = aNumElements;
1.200 + while (high > low) {
1.201 + uint32_t midPoint = (low+high) >> 1;
1.202 + if (aKey == aTable[midPoint].mKey) {
1.203 + return aTable[midPoint].mReplacement;
1.204 + }
1.205 + if (aKey > aTable[midPoint].mKey) {
1.206 + low = midPoint + 1;
1.207 + } else {
1.208 + high = midPoint;
1.209 + }
1.210 + }
1.211 + return 0;
1.212 +}
1.213 +
1.214 +#define GREEK_UPPER_THETA 0x03F4
1.215 +#define HOLE_GREEK_UPPER_THETA 0x03A2
1.216 +#define NABLA 0x2207
1.217 +#define PARTIAL_DIFFERENTIAL 0x2202
1.218 +#define GREEK_UPPER_ALPHA 0x0391
1.219 +#define GREEK_UPPER_OMEGA 0x03A9
1.220 +#define GREEK_LOWER_ALPHA 0x03B1
1.221 +#define GREEK_LOWER_OMEGA 0x03C9
1.222 +#define GREEK_LUNATE_EPSILON_SYMBOL 0x03F5
1.223 +#define GREEK_THETA_SYMBOL 0x03D1
1.224 +#define GREEK_KAPPA_SYMBOL 0x03F0
1.225 +#define GREEK_PHI_SYMBOL 0x03D5
1.226 +#define GREEK_RHO_SYMBOL 0x03F1
1.227 +#define GREEK_PI_SYMBOL 0x03D6
1.228 +#define GREEK_LETTER_DIGAMMA 0x03DC
1.229 +#define GREEK_SMALL_LETTER_DIGAMMA 0x03DD
1.230 +#define MATH_BOLD_CAPITAL_DIGAMMA 0x1D7CA
1.231 +#define MATH_BOLD_SMALL_DIGAMMA 0x1D7CB
1.232 +
1.233 +#define LATIN_SMALL_LETTER_DOTLESS_I 0x0131
1.234 +#define LATIN_SMALL_LETTER_DOTLESS_J 0x0237
1.235 +
1.236 +#define MATH_ITALIC_SMALL_DOTLESS_I 0x1D6A4
1.237 +#define MATH_ITALIC_SMALL_DOTLESS_J 0x1D6A5
1.238 +
1.239 +#define MATH_BOLD_UPPER_A 0x1D400
1.240 +#define MATH_ITALIC_UPPER_A 0x1D434
1.241 +#define MATH_BOLD_SMALL_A 0x1D41A
1.242 +#define MATH_BOLD_UPPER_ALPHA 0x1D6A8
1.243 +#define MATH_BOLD_SMALL_ALPHA 0x1D6C2
1.244 +#define MATH_ITALIC_UPPER_ALPHA 0x1D6E2
1.245 +#define MATH_BOLD_DIGIT_ZERO 0x1D7CE
1.246 +#define MATH_DOUBLE_STRUCK_ZERO 0x1D7D8
1.247 +
1.248 +#define MATH_BOLD_UPPER_THETA 0x1D6B9
1.249 +#define MATH_BOLD_NABLA 0x1D6C1
1.250 +#define MATH_BOLD_PARTIAL_DIFFERENTIAL 0x1D6DB
1.251 +#define MATH_BOLD_EPSILON_SYMBOL 0x1D6DC
1.252 +#define MATH_BOLD_THETA_SYMBOL 0x1D6DD
1.253 +#define MATH_BOLD_KAPPA_SYMBOL 0x1D6DE
1.254 +#define MATH_BOLD_PHI_SYMBOL 0x1D6DF
1.255 +#define MATH_BOLD_RHO_SYMBOL 0x1D6E0
1.256 +#define MATH_BOLD_PI_SYMBOL 0x1D6E1
1.257 +
1.258 +/*
1.259 + Performs the character mapping needed to implement MathML's mathvariant
1.260 + attribute. It takes a unicode character and maps it to its appropriate
1.261 + mathvariant counterpart specified by aMathVar. The mapped character is
1.262 + typically located within Unicode's mathematical blocks (0x1D***, 0x1EE**) but
1.263 + there are exceptions which this function accounts for.
1.264 + Characters without a valid mapping or valid aMathvar value are returned
1.265 + unaltered. Characters already in the mathematical blocks (or are one of the
1.266 + exceptions) are never transformed.
1.267 + Acceptable values for aMathVar are specified in layout/style/nsStyleConsts.h.
1.268 + The transformable characters can be found at:
1.269 + http://lists.w3.org/Archives/Public/www-math/2013Sep/0012.html and
1.270 + https://en.wikipedia.org/wiki/Mathematical_Alphanumeric_Symbols
1.271 +*/
1.272 +static uint32_t
1.273 +MathVariant(uint32_t aCh, uint8_t aMathVar)
1.274 +{
1.275 + uint32_t baseChar;
1.276 + enum CharacterType {
1.277 + kIsLatin,
1.278 + kIsGreekish,
1.279 + kIsNumber,
1.280 + kIsArabic,
1.281 + };
1.282 + CharacterType varType;
1.283 +
1.284 + int8_t multiplier;
1.285 +
1.286 + if (aMathVar <= NS_MATHML_MATHVARIANT_NORMAL) {
1.287 + // nothing to do here
1.288 + return aCh;
1.289 + }
1.290 + if (aMathVar > NS_MATHML_MATHVARIANT_STRETCHED) {
1.291 + NS_ASSERTION(false, "Illegal mathvariant value");
1.292 + return aCh;
1.293 + }
1.294 +
1.295 + // Exceptional characters with at most one possible transformation
1.296 + if (aCh == HOLE_GREEK_UPPER_THETA) {
1.297 + // Nothing at this code point is transformed
1.298 + return aCh;
1.299 + }
1.300 + if (aCh == GREEK_LETTER_DIGAMMA) {
1.301 + if (aMathVar == NS_MATHML_MATHVARIANT_BOLD) {
1.302 + return MATH_BOLD_CAPITAL_DIGAMMA;
1.303 + }
1.304 + return aCh;
1.305 + }
1.306 + if (aCh == GREEK_SMALL_LETTER_DIGAMMA) {
1.307 + if (aMathVar == NS_MATHML_MATHVARIANT_BOLD) {
1.308 + return MATH_BOLD_SMALL_DIGAMMA;
1.309 + }
1.310 + return aCh;
1.311 + }
1.312 + if (aCh == LATIN_SMALL_LETTER_DOTLESS_I) {
1.313 + if (aMathVar == NS_MATHML_MATHVARIANT_ITALIC) {
1.314 + return MATH_ITALIC_SMALL_DOTLESS_I;
1.315 + }
1.316 + return aCh;
1.317 + }
1.318 + if (aCh == LATIN_SMALL_LETTER_DOTLESS_J) {
1.319 + if (aMathVar == NS_MATHML_MATHVARIANT_ITALIC) {
1.320 + return MATH_ITALIC_SMALL_DOTLESS_J;
1.321 + }
1.322 + return aCh;
1.323 + }
1.324 +
1.325 + // The Unicode mathematical blocks are divided into four segments: Latin,
1.326 + // Greek, numbers and Arabic. In the case of the first three
1.327 + // baseChar represents the relative order in which the characters are
1.328 + // encoded in the Unicode mathematical block, normalised to the first
1.329 + // character of that sequence.
1.330 + //
1.331 + if ('A' <= aCh && aCh <= 'Z') {
1.332 + baseChar = aCh - 'A';
1.333 + varType = kIsLatin;
1.334 + } else if ('a' <= aCh && aCh <= 'z') {
1.335 + // Lowercase characters are placed immediately after the uppercase
1.336 + // characters in the Unicode mathematical block. The constant subtraction
1.337 + // represents the number of characters between the start of the sequence
1.338 + // (capital A) and the first lowercase letter.
1.339 + baseChar = MATH_BOLD_SMALL_A-MATH_BOLD_UPPER_A + aCh - 'a';
1.340 + varType = kIsLatin;
1.341 + } else if ('0' <= aCh && aCh <= '9') {
1.342 + baseChar = aCh - '0';
1.343 + varType = kIsNumber;
1.344 + } else if (GREEK_UPPER_ALPHA <= aCh && aCh <= GREEK_UPPER_OMEGA) {
1.345 + baseChar = aCh-GREEK_UPPER_ALPHA;
1.346 + varType = kIsGreekish;
1.347 + } else if (GREEK_LOWER_ALPHA <= aCh && aCh <= GREEK_LOWER_OMEGA) {
1.348 + // Lowercase Greek comes after uppercase Greek.
1.349 + // Note in this instance the presence of an additional character (Nabla)
1.350 + // between the end of the uppercase Greek characters and the lowercase
1.351 + // ones.
1.352 + baseChar = MATH_BOLD_SMALL_ALPHA - MATH_BOLD_UPPER_ALPHA
1.353 + + aCh-GREEK_LOWER_ALPHA;
1.354 + varType = kIsGreekish;
1.355 + } else if (0x0600 <= aCh && aCh <= 0x06FF) {
1.356 + // Arabic characters are defined within this range
1.357 + varType = kIsArabic;
1.358 + } else {
1.359 + switch (aCh) {
1.360 + case GREEK_UPPER_THETA:
1.361 + baseChar = MATH_BOLD_UPPER_THETA-MATH_BOLD_UPPER_ALPHA;
1.362 + break;
1.363 + case NABLA:
1.364 + baseChar = MATH_BOLD_NABLA-MATH_BOLD_UPPER_ALPHA;
1.365 + break;
1.366 + case PARTIAL_DIFFERENTIAL:
1.367 + baseChar = MATH_BOLD_PARTIAL_DIFFERENTIAL - MATH_BOLD_UPPER_ALPHA;
1.368 + break;
1.369 + case GREEK_LUNATE_EPSILON_SYMBOL:
1.370 + baseChar = MATH_BOLD_EPSILON_SYMBOL - MATH_BOLD_UPPER_ALPHA;
1.371 + break;
1.372 + case GREEK_THETA_SYMBOL:
1.373 + baseChar = MATH_BOLD_THETA_SYMBOL - MATH_BOLD_UPPER_ALPHA;
1.374 + break;
1.375 + case GREEK_KAPPA_SYMBOL:
1.376 + baseChar = MATH_BOLD_KAPPA_SYMBOL - MATH_BOLD_UPPER_ALPHA;
1.377 + break;
1.378 + case GREEK_PHI_SYMBOL:
1.379 + baseChar = MATH_BOLD_PHI_SYMBOL - MATH_BOLD_UPPER_ALPHA;
1.380 + break;
1.381 + case GREEK_RHO_SYMBOL:
1.382 + baseChar = MATH_BOLD_RHO_SYMBOL - MATH_BOLD_UPPER_ALPHA;
1.383 + break;
1.384 + case GREEK_PI_SYMBOL:
1.385 + baseChar = MATH_BOLD_PI_SYMBOL - MATH_BOLD_UPPER_ALPHA;
1.386 + break;
1.387 + default:
1.388 + return aCh;
1.389 + }
1.390 +
1.391 + varType = kIsGreekish;
1.392 + }
1.393 +
1.394 + if (varType == kIsNumber) {
1.395 + switch (aMathVar) {
1.396 + // Each possible number mathvariant is encoded in a single, contiguous
1.397 + // block. For example the beginning of the double struck number range
1.398 + // follows immediately after the end of the bold number range.
1.399 + // multiplier represents the order of the sequences relative to the first
1.400 + // one.
1.401 + case NS_MATHML_MATHVARIANT_BOLD:
1.402 + multiplier = 0;
1.403 + break;
1.404 + case NS_MATHML_MATHVARIANT_DOUBLE_STRUCK:
1.405 + multiplier = 1;
1.406 + break;
1.407 + case NS_MATHML_MATHVARIANT_SANS_SERIF:
1.408 + multiplier = 2;
1.409 + break;
1.410 + case NS_MATHML_MATHVARIANT_BOLD_SANS_SERIF:
1.411 + multiplier = 3;
1.412 + break;
1.413 + case NS_MATHML_MATHVARIANT_MONOSPACE:
1.414 + multiplier = 4;
1.415 + break;
1.416 + default:
1.417 + // This mathvariant isn't defined for numbers or is otherwise normal
1.418 + return aCh;
1.419 + }
1.420 + // As the ranges are contiguous, to find the desired mathvariant range it
1.421 + // is sufficient to multiply the position within the sequence order
1.422 + // (multiplier) with the period of the sequence (which is constant for all
1.423 + // number sequences) and to add the character point of the first character
1.424 + // within the number mathvariant range.
1.425 + // To this the baseChar calculated earlier is added to obtain the final
1.426 + // code point.
1.427 + return baseChar+multiplier*(MATH_DOUBLE_STRUCK_ZERO-MATH_BOLD_DIGIT_ZERO)
1.428 + +MATH_BOLD_DIGIT_ZERO;
1.429 + } else if (varType == kIsGreekish) {
1.430 + switch (aMathVar) {
1.431 + case NS_MATHML_MATHVARIANT_BOLD:
1.432 + multiplier = 0;
1.433 + break;
1.434 + case NS_MATHML_MATHVARIANT_ITALIC:
1.435 + multiplier = 1;
1.436 + break;
1.437 + case NS_MATHML_MATHVARIANT_BOLD_ITALIC:
1.438 + multiplier = 2;
1.439 + break;
1.440 + case NS_MATHML_MATHVARIANT_BOLD_SANS_SERIF:
1.441 + multiplier = 3;
1.442 + break;
1.443 + case NS_MATHML_MATHVARIANT_SANS_SERIF_BOLD_ITALIC:
1.444 + multiplier = 4;
1.445 + break;
1.446 + default:
1.447 + // This mathvariant isn't defined for Greek or is otherwise normal
1.448 + return aCh;
1.449 + }
1.450 + // See the kIsNumber case for an explanation of the following calculation
1.451 + return baseChar + MATH_BOLD_UPPER_ALPHA +
1.452 + multiplier*(MATH_ITALIC_UPPER_ALPHA - MATH_BOLD_UPPER_ALPHA);
1.453 + }
1.454 +
1.455 + uint32_t tempChar;
1.456 + uint32_t newChar;
1.457 + if (varType == kIsArabic) {
1.458 + const MathVarMapping* mapTable;
1.459 + uint32_t tableLength;
1.460 + switch (aMathVar) {
1.461 + /* The Arabic mathematical block is not continuous, nor does it have a
1.462 + * monotonic mapping to the unencoded characters, requiring the use of a
1.463 + * lookup table.
1.464 + */
1.465 + case NS_MATHML_MATHVARIANT_INITIAL:
1.466 + mapTable = gArabicInitialMapTable;
1.467 + tableLength = ArrayLength(gArabicInitialMapTable);
1.468 + break;
1.469 + case NS_MATHML_MATHVARIANT_TAILED:
1.470 + mapTable = gArabicTailedMapTable;
1.471 + tableLength = ArrayLength(gArabicTailedMapTable);
1.472 + break;
1.473 + case NS_MATHML_MATHVARIANT_STRETCHED:
1.474 + mapTable = gArabicStretchedMapTable;
1.475 + tableLength = ArrayLength(gArabicStretchedMapTable);
1.476 + break;
1.477 + case NS_MATHML_MATHVARIANT_LOOPED:
1.478 + mapTable = gArabicLoopedMapTable;
1.479 + tableLength = ArrayLength(gArabicLoopedMapTable);
1.480 + break;
1.481 + case NS_MATHML_MATHVARIANT_DOUBLE_STRUCK:
1.482 + mapTable = gArabicDoubleMapTable;
1.483 + tableLength = ArrayLength(gArabicDoubleMapTable);
1.484 + break;
1.485 + default:
1.486 + // No valid transformations exist
1.487 + return aCh;
1.488 + }
1.489 + newChar = MathvarMappingSearch(aCh, mapTable, tableLength);
1.490 + } else {
1.491 + // Must be Latin
1.492 + if (aMathVar > NS_MATHML_MATHVARIANT_MONOSPACE) {
1.493 + // Latin doesn't support the Arabic mathvariants
1.494 + return aCh;
1.495 + }
1.496 + multiplier = aMathVar - 2;
1.497 + // This is possible because the values for NS_MATHML_MATHVARIANT_* are
1.498 + // chosen to coincide with the order in which the encoded mathvariant
1.499 + // characters are located within their unicode block (less an offset to
1.500 + // avoid _NONE and _NORMAL variants)
1.501 + // See the kIsNumber case for an explanation of the following calculation
1.502 + tempChar = baseChar + MATH_BOLD_UPPER_A +
1.503 + multiplier*(MATH_ITALIC_UPPER_A - MATH_BOLD_UPPER_A);
1.504 + // There are roughly twenty characters that are located outside of the
1.505 + // mathematical block, so the spaces where they ought to be are used
1.506 + // as keys for a lookup table containing the correct character mappings.
1.507 + newChar = MathvarMappingSearch(tempChar, gLatinExceptionMapTable,
1.508 + ArrayLength(gLatinExceptionMapTable));
1.509 + }
1.510 +
1.511 + if (newChar) {
1.512 + return newChar;
1.513 + } else if (varType == kIsLatin) {
1.514 + return tempChar;
1.515 + } else {
1.516 + // An Arabic character without a corresponding mapping
1.517 + return aCh;
1.518 + }
1.519 +
1.520 +}
1.521 +
1.522 +void
1.523 +MathMLTextRunFactory::RebuildTextRun(nsTransformedTextRun* aTextRun,
1.524 + gfxContext* aRefContext)
1.525 +{
1.526 + gfxFontGroup* fontGroup = aTextRun->GetFontGroup();
1.527 + gfxFontStyle fontStyle = *fontGroup->GetStyle();
1.528 +
1.529 + nsAutoString convertedString;
1.530 + nsAutoTArray<bool,50> charsToMergeArray;
1.531 + nsAutoTArray<bool,50> deletedCharsArray;
1.532 + nsAutoTArray<nsStyleContext*,50> styleArray;
1.533 + nsAutoTArray<uint8_t,50> canBreakBeforeArray;
1.534 + bool mergeNeeded = false;
1.535 +
1.536 + bool singleCharMI =
1.537 + aTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_SINGLE_CHAR_MI;
1.538 +
1.539 + uint32_t length = aTextRun->GetLength();
1.540 + const char16_t* str = aTextRun->mString.BeginReading();
1.541 + nsRefPtr<nsStyleContext>* styles = aTextRun->mStyles.Elements();
1.542 +
1.543 + if (mSSTYScriptLevel && length) {
1.544 + bool found = false;
1.545 + // We respect ssty settings explicitly set by the user
1.546 + for (uint32_t i = 0; i < fontStyle.featureSettings.Length(); i++) {
1.547 + if (fontStyle.featureSettings[i].mTag == TRUETYPE_TAG('s','s','t','y')) {
1.548 + found = true;
1.549 + break;
1.550 + }
1.551 + }
1.552 + if (!found) {
1.553 + uint8_t sstyLevel = 0;
1.554 + float scriptScaling = pow(styles[0]->StyleFont()->mScriptSizeMultiplier,
1.555 + mSSTYScriptLevel);
1.556 + static_assert(NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER < 1,
1.557 + "Shouldn't it make things smaller?");
1.558 + /*
1.559 + An SSTY level of 2 is set if the scaling factor is less than or equal
1.560 + to halfway between that for a scriptlevel of 1 (0.71) and that of a
1.561 + scriptlevel of 2 (0.71^2), assuming the default script size multiplier.
1.562 + An SSTY level of 1 is set if the script scaling factor is less than
1.563 + or equal that for a scriptlevel of 1 assuming the default script size
1.564 + multiplier.
1.565 +
1.566 + User specified values of script size multiplier will change the scaling
1.567 + factor which mSSTYScriptLevel values correspond to.
1.568 +
1.569 + In the event that the script size multiplier actually makes things
1.570 + larger, no change is made.
1.571 +
1.572 + If the user doesn't want this to happen, all they need to do is set
1.573 + style="-moz-font-feature-settings: 'ssty' 0"
1.574 + */
1.575 + if (scriptScaling <= (NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER +
1.576 + (NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER*
1.577 + NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER))/2) {
1.578 + // Currently only the first two ssty settings are used, so two is large
1.579 + // as we go
1.580 + sstyLevel = 2;
1.581 + } else if (scriptScaling <= NS_MATHML_DEFAULT_SCRIPT_SIZE_MULTIPLIER) {
1.582 + sstyLevel = 1;
1.583 + }
1.584 + if (sstyLevel) {
1.585 + gfxFontFeature settingSSTY;
1.586 + settingSSTY.mTag = TRUETYPE_TAG('s','s','t','y');
1.587 + settingSSTY.mValue = sstyLevel;
1.588 + fontStyle.featureSettings.AppendElement(settingSSTY);
1.589 + }
1.590 + }
1.591 + }
1.592 +
1.593 + uint8_t mathVar;
1.594 + bool doMathvariantStyling = true;
1.595 +
1.596 + for (uint32_t i = 0; i < length; ++i) {
1.597 + int extraChars = 0;
1.598 + nsStyleContext* styleContext = styles[i];
1.599 + mathVar = styleContext->StyleFont()->mMathVariant;
1.600 +
1.601 + if (singleCharMI && mathVar == NS_MATHML_MATHVARIANT_NONE) {
1.602 + mathVar = NS_MATHML_MATHVARIANT_ITALIC;
1.603 + }
1.604 +
1.605 + uint32_t ch = str[i];
1.606 + if (NS_IS_HIGH_SURROGATE(ch) && i < length - 1 &&
1.607 + NS_IS_LOW_SURROGATE(str[i + 1])) {
1.608 + ch = SURROGATE_TO_UCS4(ch, str[i + 1]);
1.609 + }
1.610 + uint32_t ch2 = MathVariant(ch, mathVar);
1.611 +
1.612 + if (mathVar == NS_MATHML_MATHVARIANT_BOLD ||
1.613 + mathVar == NS_MATHML_MATHVARIANT_BOLD_ITALIC ||
1.614 + mathVar == NS_MATHML_MATHVARIANT_ITALIC) {
1.615 + if (ch == ch2 && ch != 0x20 && ch != 0xA0) {
1.616 + // Don't apply the CSS style if a character cannot be
1.617 + // transformed. There is an exception for whitespace as it is both
1.618 + // common and innocuous.
1.619 + doMathvariantStyling = false;
1.620 + }
1.621 + if (ch2 != ch) {
1.622 + // Bug 930504. Some platforms do not have fonts for Mathematical
1.623 + // Alphanumeric Symbols. Hence we check whether the transformed
1.624 + // character is actually available.
1.625 + uint8_t matchType;
1.626 + nsRefPtr<gfxFont> mathFont = fontGroup->
1.627 + FindFontForChar(ch2, 0, HB_SCRIPT_COMMON, nullptr, &matchType);
1.628 + if (mathFont) {
1.629 + // Don't apply the CSS style if there is a math font for at least one
1.630 + // of the transformed character in this text run.
1.631 + doMathvariantStyling = false;
1.632 + } else {
1.633 + // We fallback to the original character.
1.634 + ch2 = ch;
1.635 + }
1.636 + }
1.637 + }
1.638 +
1.639 + deletedCharsArray.AppendElement(false);
1.640 + charsToMergeArray.AppendElement(false);
1.641 + styleArray.AppendElement(styleContext);
1.642 + canBreakBeforeArray.AppendElement(aTextRun->CanBreakLineBefore(i));
1.643 +
1.644 + if (IS_IN_BMP(ch2)) {
1.645 + convertedString.Append(ch2);
1.646 + } else {
1.647 + convertedString.Append(H_SURROGATE(ch2));
1.648 + convertedString.Append(L_SURROGATE(ch2));
1.649 + ++extraChars;
1.650 + if (!IS_IN_BMP(ch)) {
1.651 + deletedCharsArray.AppendElement(true); // not exactly deleted, but
1.652 + // the trailing surrogate is skipped
1.653 + ++i;
1.654 + }
1.655 + }
1.656 +
1.657 + while (extraChars-- > 0) {
1.658 + mergeNeeded = true;
1.659 + charsToMergeArray.AppendElement(true);
1.660 + styleArray.AppendElement(styleContext);
1.661 + canBreakBeforeArray.AppendElement(false);
1.662 + }
1.663 + }
1.664 +
1.665 + uint32_t flags;
1.666 + gfxTextRunFactory::Parameters innerParams =
1.667 + GetParametersForInner(aTextRun, &flags, aRefContext);
1.668 +
1.669 + nsAutoPtr<nsTransformedTextRun> transformedChild;
1.670 + nsAutoPtr<gfxTextRun> cachedChild;
1.671 + gfxTextRun* child;
1.672 +
1.673 + if (mathVar == NS_MATHML_MATHVARIANT_BOLD && doMathvariantStyling) {
1.674 + fontStyle.style = NS_FONT_STYLE_NORMAL;
1.675 + fontStyle.weight = NS_FONT_WEIGHT_BOLD;
1.676 + } else if (mathVar == NS_MATHML_MATHVARIANT_ITALIC && doMathvariantStyling) {
1.677 + fontStyle.style = NS_FONT_STYLE_ITALIC;
1.678 + fontStyle.weight = NS_FONT_WEIGHT_NORMAL;
1.679 + } else if (mathVar == NS_MATHML_MATHVARIANT_BOLD_ITALIC &&
1.680 + doMathvariantStyling) {
1.681 + fontStyle.style = NS_FONT_STYLE_ITALIC;
1.682 + fontStyle.weight = NS_FONT_WEIGHT_BOLD;
1.683 + } else if (mathVar != NS_MATHML_MATHVARIANT_NONE) {
1.684 + // Mathvariant overrides fontstyle and fontweight
1.685 + // Need to check to see if mathvariant is actually applied as this function
1.686 + // is used for other purposes.
1.687 + fontStyle.style = NS_FONT_STYLE_NORMAL;
1.688 + fontStyle.weight = NS_FONT_WEIGHT_NORMAL;
1.689 + }
1.690 + nsRefPtr<gfxFontGroup> newFontGroup = fontGroup->Copy(&fontStyle);
1.691 +
1.692 + if (!newFontGroup)
1.693 + return;
1.694 +
1.695 + if (mInnerTransformingTextRunFactory) {
1.696 + transformedChild = mInnerTransformingTextRunFactory->MakeTextRun(
1.697 + convertedString.BeginReading(), convertedString.Length(),
1.698 + &innerParams, newFontGroup, flags, styleArray.Elements(), false);
1.699 + child = transformedChild.get();
1.700 + } else {
1.701 + cachedChild = newFontGroup->MakeTextRun(
1.702 + convertedString.BeginReading(), convertedString.Length(),
1.703 + &innerParams, flags);
1.704 + child = cachedChild.get();
1.705 + }
1.706 + if (!child)
1.707 + return;
1.708 + // Copy potential linebreaks into child so they're preserved
1.709 + // (and also child will be shaped appropriately)
1.710 + NS_ASSERTION(convertedString.Length() == canBreakBeforeArray.Length(),
1.711 + "Dropped characters or break-before values somewhere!");
1.712 + child->SetPotentialLineBreaks(0, canBreakBeforeArray.Length(),
1.713 + canBreakBeforeArray.Elements(), aRefContext);
1.714 + if (transformedChild) {
1.715 + transformedChild->FinishSettingProperties(aRefContext);
1.716 + }
1.717 +
1.718 + if (mergeNeeded) {
1.719 + // Now merge multiple characters into one multi-glyph character as required
1.720 + NS_ASSERTION(charsToMergeArray.Length() == child->GetLength(),
1.721 + "source length mismatch");
1.722 + NS_ASSERTION(deletedCharsArray.Length() == aTextRun->GetLength(),
1.723 + "destination length mismatch");
1.724 + MergeCharactersInTextRun(aTextRun, child, charsToMergeArray.Elements(),
1.725 + deletedCharsArray.Elements());
1.726 + } else {
1.727 + // No merging to do, so just copy; this produces a more optimized textrun.
1.728 + // We can't steal the data because the child may be cached and stealing
1.729 + // the data would break the cache.
1.730 + aTextRun->ResetGlyphRuns();
1.731 + aTextRun->CopyGlyphDataFrom(child, 0, child->GetLength(), 0);
1.732 + }
1.733 +}
