| File: | /rootdir/_build/../src/bidi.cc |
| Warning: | line 694, column 33 Value stored to 'tl' is never read |
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| 1 | /* |
| 2 | * Copyright © 2018–2019 Egmont Koblinger |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 2.1 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | /* |
| 20 | * A BidiRow object stores the BiDi mapping between logical and visual positions |
| 21 | * for one visual line of text. (Characters are always shuffled within a line, |
| 22 | * never across lines.) |
| 23 | * |
| 24 | * It also stores additional per-character properties: the character's direction |
| 25 | * (needed for mirroring and mouse selecting) and Arabic shaping (as currently |
| 26 | * done using presentation form characters, although HarfBuzz would probably be |
| 27 | * a better approach). |
| 28 | * |
| 29 | * There are per-line properties as well, which are actually per-paragraph |
| 30 | * properties stored for each line: the overall potentially autodetected |
| 31 | * direction (needed for keyboard arrow swapping), and whether the paragraph |
| 32 | * contains any foreign direction character (used for the cursor shape). |
| 33 | * |
| 34 | * Note that the trivial LTR mapping, with no RTL or shaped characters at all, |
| 35 | * might be denoted by setting the BidiRow's width to 0. |
| 36 | * |
| 37 | * BidiRunner is a collection of methods that run the BiDi algorithm on one |
| 38 | * paragraph of RingView, and stores the result in BidiRow objects. |
| 39 | * |
| 40 | * BiDi is implemented according to Terminal-wg/bidi v0.2: |
| 41 | * https://terminal-wg.pages.freedesktop.org/bidi/ |
| 42 | */ |
| 43 | |
| 44 | #include <config.h> |
| 45 | |
| 46 | #ifdef WITH_FRIBIDI |
| 47 | #include <fribidi.h> |
| 48 | #endif |
| 49 | |
| 50 | #include "bidi.hh" |
| 51 | #include "debug.h" |
| 52 | #include "btedefines.hh" |
| 53 | #include "bteinternal.hh" |
| 54 | |
| 55 | #ifdef WITH_FRIBIDI |
| 56 | static_assert (sizeof (FriBidiChar) == sizeof (gunichar), "Unexpected FriBidiChar size"); |
| 57 | #endif |
| 58 | |
| 59 | /* Don't do Arabic ligatures as per bug 142. */ |
| 60 | #define BTE_ARABIC_SHAPING_FLAGS(( 0x00000100 | 0x00000200 ) & ~0x00000200) (FRIBIDI_FLAGS_ARABIC( 0x00000100 | 0x00000200 ) & ~FRIBIDI_FLAG_SHAPE_ARAB_LIGA0x00000200) |
| 61 | |
| 62 | using namespace bte::base; |
| 63 | |
| 64 | BidiRow::~BidiRow() |
| 65 | { |
| 66 | g_free (m_log2vis); |
| 67 | g_free (m_vis2log); |
| 68 | g_free (m_vis_rtl); |
| 69 | g_free (m_vis_shaped_base_char); |
| 70 | } |
| 71 | |
| 72 | void |
| 73 | BidiRow::set_width(bte::grid::column_t width) |
| 74 | { |
| 75 | g_assert_cmpint(width, >=, 0)do { gint64 __n1 = (width), __n2 = (0); if (__n1 >= __n2) ; else g_assertion_message_cmpnum ("BTE", "../src/bidi.cc", 75 , ((const char*) (__PRETTY_FUNCTION__)), "width" " " ">=" " " "0", (long double) __n1, ">=", (long double) __n2, 'i'); } while (0); |
| 76 | if (G_UNLIKELY (width > G_MAXUSHORT)(__builtin_expect (__extension__ ({ int _g_boolean_var_; if ( width > (32767 *2 +1)) _g_boolean_var_ = 1; else _g_boolean_var_ = 0; _g_boolean_var_; }), 0))) { |
| 77 | width = G_MAXUSHORT(32767 *2 +1); |
| 78 | } |
| 79 | |
| 80 | if (G_UNLIKELY (width > m_width_alloc)(__builtin_expect (__extension__ ({ int _g_boolean_var_; if ( width > m_width_alloc) _g_boolean_var_ = 1; else _g_boolean_var_ = 0; _g_boolean_var_; }), 0))) { |
| 81 | uint32_t alloc = m_width_alloc; /* use a wider data type to avoid overflow */ |
| 82 | if (alloc == 0) { |
| 83 | alloc = MAX(width, 80)(((width) > (80)) ? (width) : (80)); |
| 84 | } |
| 85 | while (width > alloc) { |
| 86 | /* Don't realloc too aggressively. */ |
| 87 | alloc = alloc * 5 / 4; |
| 88 | } |
| 89 | if (alloc > G_MAXUSHORT(32767 *2 +1)) { |
| 90 | alloc = G_MAXUSHORT(32767 *2 +1); |
| 91 | } |
| 92 | m_width_alloc = alloc; |
| 93 | |
| 94 | m_log2vis = (uint16_t *) g_realloc (m_log2vis, sizeof (uint16_t) * m_width_alloc); |
| 95 | m_vis2log = (uint16_t *) g_realloc (m_vis2log, sizeof (uint16_t) * m_width_alloc); |
| 96 | m_vis_rtl = (uint8_t *) g_realloc (m_vis_rtl, sizeof (uint8_t) * m_width_alloc); |
| 97 | m_vis_shaped_base_char = (gunichar *) g_realloc (m_vis_shaped_base_char, sizeof (gunichar) * m_width_alloc); |
| 98 | } |
| 99 | |
| 100 | m_width = width; |
| 101 | } |
| 102 | |
| 103 | /* Converts from logical to visual column. Offscreen columns are mirrored |
| 104 | * for RTL lines, e.g. (assuming 80 columns) -1 <=> 80, -2 <=> 81 etc. */ |
| 105 | bte::grid::column_t |
| 106 | BidiRow::log2vis(bte::grid::column_t col) const |
| 107 | { |
| 108 | if (col >= 0 && col < m_width) { |
| 109 | return m_log2vis[col]; |
| 110 | } else { |
| 111 | return m_base_rtl ? m_width - 1 - col : col; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | /* Converts from visual to logical column. Offscreen columns are mirrored |
| 116 | * for RTL lines, e.g. (assuming 80 columns) -1 <=> 80, -2 <=> 81 etc. */ |
| 117 | bte::grid::column_t |
| 118 | BidiRow::vis2log(bte::grid::column_t col) const |
| 119 | { |
| 120 | if (col >= 0 && col < m_width) { |
| 121 | return m_vis2log[col]; |
| 122 | } else { |
| 123 | return m_base_rtl ? m_width - 1 - col : col; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /* Whether the cell at the given visual position has RTL directionality. |
| 128 | * For offscreen columns the line's base direction is returned. */ |
| 129 | bool |
| 130 | BidiRow::vis_is_rtl(bte::grid::column_t col) const |
| 131 | { |
| 132 | if (col >= 0 && col < m_width) { |
| 133 | return m_vis_rtl[col]; |
| 134 | } else { |
| 135 | return m_base_rtl; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | /* Whether the cell at the given logical position has RTL directionality. |
| 140 | * For offscreen columns the line's base direction is returned. */ |
| 141 | bool |
| 142 | BidiRow::log_is_rtl(bte::grid::column_t col) const |
| 143 | { |
| 144 | if (col >= 0 && col < m_width) { |
| 145 | col = m_log2vis[col]; |
| 146 | return m_vis_rtl[col]; |
| 147 | } else { |
| 148 | return m_base_rtl; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | /* Get the shaped character (including combining accents, i.e. bteunistr) for the |
| 153 | * given visual position. |
| 154 | * |
| 155 | * The unshaped character (including combining accents, i.e. bteunistr) needs to be |
| 156 | * passed to this method. |
| 157 | * |
| 158 | * m_vis_shaped_base_char stores the shaped base character without combining accents. |
| 159 | * Apply the combining accents here. There's no design rationale behind this, it's |
| 160 | * just much simpler to do it here than during the BiDi algorithm. |
| 161 | * |
| 162 | * In some cases a fully LTR line is denoted by m_width being 0. In other cases a |
| 163 | * character that didn't need shaping is stored as the value 0. In order to provide a |
| 164 | * consistent and straightforward behavior (where the caller doesn't need to special |
| 165 | * case the return value of 0) we need to ask for the unshaped character anyway. |
| 166 | * |
| 167 | * FIXMEegmont This should have a wrapper method in RingView. That could always return |
| 168 | * the actual (potentially shaped) character without asking for the unshaped one. |
| 169 | */ |
| 170 | bteunistr |
| 171 | BidiRow::vis_get_shaped_char(bte::grid::column_t col, bteunistr s) const |
| 172 | { |
| 173 | g_assert_cmpint (col, >=, 0)do { gint64 __n1 = (col), __n2 = (0); if (__n1 >= __n2) ; else g_assertion_message_cmpnum ("BTE", "../src/bidi.cc", 173, (( const char*) (__PRETTY_FUNCTION__)), "col" " " ">=" " " "0" , (long double) __n1, ">=", (long double) __n2, 'i'); } while (0); |
| 174 | |
| 175 | if (col >= m_width || m_vis_shaped_base_char[col] == 0) |
| 176 | return s; |
| 177 | |
| 178 | return _bte_unistr_replace_base(s, m_vis_shaped_base_char[col]); |
| 179 | } |
| 180 | |
| 181 | |
| 182 | #ifdef WITH_FRIBIDI |
| 183 | static inline bool |
| 184 | is_arabic(gunichar c) |
| 185 | { |
| 186 | return FRIBIDI_IS_ARABIC (fribidi_get_bidi_type (c))((fribidi_get_bidi_type (c)) & 0x00000002L); |
| 187 | } |
| 188 | |
| 189 | /* Perform Arabic shaping on an explicit line (which could be explicit LTR or explicit RTL), |
| 190 | * using presentation form characters. |
| 191 | * |
| 192 | * Don't do shaping across lines. (I'm unsure about this design decision. |
| 193 | * Shaping across soft linebreaks would require an even much more complex code.) |
| 194 | * |
| 195 | * The FriBiDi API doesn't have a method for shaping a visual string, so we need to extract |
| 196 | * Arabic words ourselves, by walking in the visual order from right to left. It's painful. |
| 197 | * |
| 198 | * This whole shaping business with presentation form characters should be replaced by HarfBuzz. |
| 199 | */ |
| 200 | void |
| 201 | BidiRunner::explicit_line_shape(bte::grid::row_t row) |
| 202 | { |
| 203 | const BteRowData *row_data = m_ringview->get_row(row); |
| 204 | |
| 205 | BidiRow *bidirow = m_ringview->get_bidirow_writable(row); |
| 206 | |
| 207 | auto width = m_ringview->get_width(); |
| 208 | |
| 209 | GArray *fribidi_chars_array = nullptr; |
| 210 | |
| 211 | FriBidiParType pbase_dir = FRIBIDI_PAR_RTL( 0x00000010L | 0x00000100L | 0x00000001L); |
| 212 | FriBidiLevel level; |
| 213 | FriBidiChar *fribidi_chars; |
| 214 | FriBidiCharType *fribidi_chartypes; |
| 215 | FriBidiBracketType *fribidi_brackettypes; |
| 216 | FriBidiJoiningType *fribidi_joiningtypes; |
| 217 | FriBidiLevel *fribidi_levels; |
| 218 | |
| 219 | int count; |
| 220 | |
| 221 | const BteCell *cell; |
| 222 | gunichar c; |
| 223 | gunichar base; |
| 224 | int i, j; /* visual columns */ |
| 225 | |
| 226 | fribidi_chars_array = g_array_sized_new (FALSE(0), FALSE(0), sizeof (FriBidiChar), width); |
| 227 | |
| 228 | /* Walk in visual order from right to left. */ |
| 229 | i = width - 1; |
| 230 | while (i >= 0) { |
| 231 | cell = _bte_row_data_get(row_data, bidirow->vis2log(i)); |
| 232 | c = cell ? cell->c : 0; |
| 233 | base = _bte_unistr_get_base(c); |
| 234 | if (!is_arabic(base)) { |
| 235 | i--; |
| 236 | continue; |
| 237 | } |
| 238 | |
| 239 | /* Found an Arabic character. Keep walking to the left, extracting the word. */ |
| 240 | g_array_set_size(fribidi_chars_array, 0); |
| 241 | j = i; |
| 242 | do { |
| 243 | auto prev_len = fribidi_chars_array->len; |
| 244 | _bte_unistr_append_to_gunichars (cell->c, fribidi_chars_array); |
| 245 | g_assert_cmpint (fribidi_chars_array->len, >, prev_len)do { gint64 __n1 = (fribidi_chars_array->len), __n2 = (prev_len ); if (__n1 > __n2) ; else g_assertion_message_cmpnum ("BTE" , "../src/bidi.cc", 245, ((const char*) (__PRETTY_FUNCTION__) ), "fribidi_chars_array->len" " " ">" " " "prev_len", ( long double) __n1, ">", (long double) __n2, 'i'); } while ( 0); |
| 246 | |
| 247 | j--; |
| 248 | if (j >= 0) { |
| 249 | cell = _bte_row_data_get(row_data, bidirow->vis2log(j)); |
| 250 | c = cell ? cell->c : 0; |
| 251 | base = _bte_unistr_get_base(c); |
| 252 | } else { |
| 253 | /* Pretend that visual column -1 contains a stop char. */ |
| 254 | base = 0; |
| 255 | } |
| 256 | } while (is_arabic(base)); |
| 257 | |
| 258 | /* Extracted the Arabic run. Do the BiDi. */ |
| 259 | |
| 260 | /* Convenience stuff, we no longer need the auto-growing GArray wrapper. */ |
| 261 | count = fribidi_chars_array->len; |
| 262 | fribidi_chars = (FriBidiChar *) fribidi_chars_array->data; |
| 263 | |
| 264 | /* Run the BiDi algorithm on the paragraph to get the embedding levels. */ |
| 265 | fribidi_chartypes = g_newa (FriBidiCharType, count)((FriBidiCharType*) __builtin_alloca (sizeof (FriBidiCharType ) * (gsize) (count))); |
| 266 | fribidi_brackettypes = g_newa (FriBidiBracketType, count)((FriBidiBracketType*) __builtin_alloca (sizeof (FriBidiBracketType ) * (gsize) (count))); |
| 267 | fribidi_joiningtypes = g_newa (FriBidiJoiningType, count)((FriBidiJoiningType*) __builtin_alloca (sizeof (FriBidiJoiningType ) * (gsize) (count))); |
| 268 | fribidi_levels = g_newa (FriBidiLevel, count)((FriBidiLevel*) __builtin_alloca (sizeof (FriBidiLevel) * (gsize ) (count))); |
| 269 | |
| 270 | fribidi_get_bidi_types (fribidi_chars, count, fribidi_chartypes); |
| 271 | fribidi_get_bracket_types (fribidi_chars, count, fribidi_chartypes, fribidi_brackettypes); |
| 272 | fribidi_get_joining_types (fribidi_chars, count, fribidi_joiningtypes); |
| 273 | level = fribidi_get_par_embedding_levels_ex (fribidi_chartypes, fribidi_brackettypes, count, &pbase_dir, fribidi_levels) - 1; |
| 274 | if (level == (FriBidiLevel)(-1)) { |
| 275 | /* Error. Skip shaping this word. */ |
| 276 | i = j - 1; |
| 277 | continue; |
| 278 | } |
| 279 | |
| 280 | /* Shaping. */ |
| 281 | fribidi_join_arabic (fribidi_chartypes, count, fribidi_levels, fribidi_joiningtypes); |
| 282 | fribidi_shape_arabic (BTE_ARABIC_SHAPING_FLAGS(( 0x00000100 | 0x00000200 ) & ~0x00000200), fribidi_levels, count, fribidi_joiningtypes, fribidi_chars); |
| 283 | |
| 284 | /* If we have the shortcut notation for the trivial LTR mapping, we need to |
| 285 | * expand it to the nontrivial notation, in order to store the shaped character. */ |
| 286 | if (bidirow->m_width == 0) { |
| 287 | bidirow->set_width(width); |
| 288 | for (int k = 0; k < width; k++) { |
| 289 | bidirow->m_log2vis[k] = bidirow->m_vis2log[k] = k; |
| 290 | bidirow->m_vis_rtl[k] = false; |
| 291 | bidirow->m_vis_shaped_base_char[k] = 0; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | /* Walk through the Arabic word again. */ |
| 296 | j = i; |
| 297 | while (count > 0) { |
| 298 | g_assert_cmpint (j, >=, 0)do { gint64 __n1 = (j), __n2 = (0); if (__n1 >= __n2) ; else g_assertion_message_cmpnum ("BTE", "../src/bidi.cc", 298, (( const char*) (__PRETTY_FUNCTION__)), "j" " " ">=" " " "0", (long double) __n1, ">=", (long double) __n2, 'i'); } while (0); |
| 299 | cell = _bte_row_data_get(row_data, bidirow->vis2log(j)); |
| 300 | c = cell->c; |
| 301 | base = _bte_unistr_get_base(c); |
| 302 | if (*fribidi_chars != base) { |
| 303 | /* Shaping changed the codepoint, store it. */ |
| 304 | bidirow->m_vis_shaped_base_char[j] = *fribidi_chars; |
| 305 | } |
| 306 | int len = _bte_unistr_strlen(c); |
| 307 | fribidi_chars += len; |
| 308 | count -= len; |
| 309 | j--; |
| 310 | } |
| 311 | |
| 312 | /* Ready to look for the next word. Skip the stop char which isn't Arabic. */ |
| 313 | i = j - 1; |
| 314 | } |
| 315 | |
| 316 | g_array_free (fribidi_chars_array, TRUE(!(0))); |
| 317 | } |
| 318 | #endif /* WITH_FRIBIDI */ |
| 319 | |
| 320 | /* Set up the mapping according to explicit mode for a given line. |
| 321 | * |
| 322 | * If @do_shaping then perform Arabic shaping on the visual string, independently |
| 323 | * from the paragraph direction (the @rtl parameter). This is done using |
| 324 | * presentation form characters, until we have something better (e.g. HarfBuzz) |
| 325 | * in place. |
| 326 | */ |
| 327 | void |
| 328 | BidiRunner::explicit_line(bte::grid::row_t row, bool rtl, bool do_shaping) |
| 329 | { |
| 330 | int i; |
| 331 | |
| 332 | BidiRow *bidirow = m_ringview->get_bidirow_writable(row); |
| 333 | if (G_UNLIKELY (bidirow == nullptr)(__builtin_expect (__extension__ ({ int _g_boolean_var_; if ( bidirow == nullptr) _g_boolean_var_ = 1; else _g_boolean_var_ = 0; _g_boolean_var_; }), 0))) |
| 334 | return; |
| 335 | bidirow->m_base_rtl = rtl; |
| 336 | bidirow->m_has_foreign = false; |
| 337 | |
| 338 | auto width = m_ringview->get_width(); |
| 339 | |
| 340 | if (G_LIKELY (!rtl)(__builtin_expect (__extension__ ({ int _g_boolean_var_; if ( !rtl) _g_boolean_var_ = 1; else _g_boolean_var_ = 0; _g_boolean_var_ ; }), 1))) { |
| 341 | /* Shortcut notation: a width of 0 means the trivial LTR mapping. */ |
| 342 | bidirow->set_width(0); |
| 343 | } else { |
| 344 | /* Set up the explicit RTL mapping. */ |
| 345 | bidirow->set_width(width); |
| 346 | for (i = 0; i < width; i++) { |
| 347 | bidirow->m_log2vis[i] = bidirow->m_vis2log[i] = width - 1 - i; |
| 348 | bidirow->m_vis_rtl[i] = true; |
| 349 | bidirow->m_vis_shaped_base_char[i] = 0; |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | #ifdef WITH_FRIBIDI |
| 354 | if (do_shaping) |
| 355 | explicit_line_shape(row); |
| 356 | #endif |
| 357 | } |
| 358 | |
| 359 | /* Figure out the mapping for the paragraph between the given rows. */ |
| 360 | void |
| 361 | BidiRunner::paragraph(bte::grid::row_t start, bte::grid::row_t end, |
| 362 | bool do_bidi, bool do_shaping) |
| 363 | { |
| 364 | const BteRowData *row_data = m_ringview->get_row(start); |
| 365 | |
| 366 | if (G_UNLIKELY (m_ringview->get_width() > G_MAXUSHORT)(__builtin_expect (__extension__ ({ int _g_boolean_var_; if ( m_ringview->get_width() > (32767 *2 +1)) _g_boolean_var_ = 1; else _g_boolean_var_ = 0; _g_boolean_var_; }), 0))) { |
| 367 | /* log2vis and vis2log mappings have 2 bytes per cell. |
| 368 | * Don't do BiDi for extremely wide terminals. */ |
| 369 | explicit_paragraph(start, end, false, false); |
| 370 | return; |
| 371 | } |
| 372 | |
| 373 | if (!do_bidi) { |
| 374 | explicit_paragraph(start, end, false, do_shaping); |
| 375 | return; |
| 376 | } |
| 377 | |
| 378 | #ifdef WITH_FRIBIDI |
| 379 | /* Have a consistent limit on the number of rows in a paragraph |
| 380 | * that can get implicit BiDi treatment, which is independent from |
| 381 | * the current scroll position. */ |
| 382 | if ((row_data->attr.bidi_flags & BTE_BIDI_FLAG_IMPLICIT) && |
| 383 | end - start <= BTE_RINGVIEW_PARAGRAPH_LENGTH_MAX500) { |
| 384 | if (implicit_paragraph(start, end, do_shaping)) |
| 385 | return; |
| 386 | } |
| 387 | #endif |
| 388 | |
| 389 | explicit_paragraph(start, end, row_data->attr.bidi_flags & BTE_BIDI_FLAG_RTL, do_shaping); |
| 390 | } |
| 391 | |
| 392 | /* Set up the mapping according to explicit mode, for all the lines |
| 393 | * of a paragraph between the given lines. */ |
| 394 | void |
| 395 | BidiRunner::explicit_paragraph(bte::grid::row_t start, bte::grid::row_t end, |
| 396 | bool rtl, bool do_shaping) |
| 397 | { |
| 398 | for (; start < end; start++) { |
| 399 | explicit_line(start, rtl, do_shaping); |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | #ifdef WITH_FRIBIDI |
| 404 | /* Figure out the mapping for the implicit paragraph between the given rows. |
| 405 | * Returns success. */ |
| 406 | bool |
| 407 | BidiRunner::implicit_paragraph(bte::grid::row_t start, bte::grid::row_t end, bool do_shaping) |
| 408 | { |
| 409 | const BteCell *cell; |
| 410 | const BteRowData *row_data; |
| 411 | bool rtl; |
| 412 | bool autodir; |
| 413 | bool has_foreign; |
| 414 | bte::grid::row_t row; |
| 415 | FriBidiParType pbase_dir; |
| 416 | FriBidiLevel level; |
| 417 | FriBidiChar *fribidi_chars; |
| 418 | FriBidiCharType *fribidi_chartypes; |
| 419 | FriBidiBracketType *fribidi_brackettypes; |
| 420 | FriBidiJoiningType *fribidi_joiningtypes; |
| 421 | FriBidiLevel *fribidi_levels; |
| 422 | FriBidiStrIndex *fribidi_map; |
| 423 | FriBidiStrIndex *fribidi_to_term; |
| 424 | BidiRow *bidirow; |
| 425 | |
| 426 | auto width = m_ringview->get_width(); |
| 427 | |
| 428 | row_data = m_ringview->get_row(start); |
| 429 | rtl = row_data->attr.bidi_flags & BTE_BIDI_FLAG_RTL; |
| 430 | autodir = row_data->attr.bidi_flags & BTE_BIDI_FLAG_AUTO; |
| 431 | |
| 432 | int lines[BTE_RINGVIEW_PARAGRAPH_LENGTH_MAX500 + 1]; /* offsets to the beginning of lines */ |
| 433 | lines[0] = 0; |
| 434 | int line = 0; /* line number within the paragraph */ |
| 435 | int count; /* total character count */ |
| 436 | int tl, tv; /* terminal logical and visual */ |
| 437 | int fl, fv; /* fribidi logical and visual */ |
| 438 | unsigned int col; |
| 439 | |
| 440 | GArray *fribidi_chars_array = g_array_sized_new (FALSE(0), FALSE(0), sizeof (FriBidiChar), (end - start) * width); |
| 441 | GArray *fribidi_map_array = g_array_sized_new (FALSE(0), FALSE(0), sizeof (FriBidiStrIndex), (end - start) * width); |
| 442 | GArray *fribidi_to_term_array = g_array_sized_new (FALSE(0), FALSE(0), sizeof (FriBidiStrIndex), (end - start) * width); |
| 443 | |
| 444 | /* Extract the paragraph's contents, omitting unused and fragment cells. */ |
| 445 | |
| 446 | /* Example of what is going on, showing the most important steps: |
| 447 | * |
| 448 | * Let's take the string produced by this command: |
| 449 | * echo -e "\u0041\u05e9\u05b8\u05c1\u05dc\u05d5\u05b9\u05dd\u0031\u0032\uff1c\u05d0" |
| 450 | * |
| 451 | * This string consists of: |
| 452 | * - English letter A |
| 453 | * - Hebrew word Shalom: |
| 454 | * - Letter Shin: ש |
| 455 | * - Combining accent Qamats |
| 456 | * - Combining accent Shin Dot |
| 457 | * - Letter Lamed: ל |
| 458 | * - Letter Vav: ו |
| 459 | * - Combining accent Holam |
| 460 | * - Letter Final Mem: ם |
| 461 | * - Digits One and Two |
| 462 | * - Full-width less-than sign U+ff1c: ＜ |
| 463 | * - Hebrew letter Alef: א |
| 464 | * |
| 465 | * Features of this example: |
| 466 | * - Overall LTR direction for convenience (set up by the leading English letter) |
| 467 | * - Combining accents within RTL |
| 468 | * - Double width character with RTL resolved direction |
| 469 | * - A mapping that is not its own inverse (due to the digits being LTR inside RTL inside LTR), |
| 470 | * to help catch if we'd look up something in the wrong direction |
| 471 | * |
| 472 | * Not demonstrated in this example: |
| 473 | * - Wrapping a paragraph to lines |
| 474 | * - Spacing marks |
| 475 | * |
| 476 | * Pre-BiDi (logical) order, using approximating glyphs ("Shalom" is "w7io", Alef is "x"): |
| 477 | * Aw7io12<x |
| 478 | * |
| 479 | * Post-BiDi (visual) order, using approximating glyphs ("Shalom" is "oi7w", note the mirrored less-than): |
| 480 | * Ax>12oi7w |
| 481 | * |
| 482 | * Terminal's logical cells: |
| 483 | * [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] |
| 484 | * row_data: A Shin+qam+dot Lam Vav+hol Mem One Two Less Less (cont) Alef |
| 485 | * |
| 486 | * Extracted to pass to FriBidi (combining accents get -1, double wides' continuation cells are skipped): |
| 487 | * [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] |
| 488 | * fribidi_chars: A Shin qam dot Lam Vav hol Mem One Two Less Alef |
| 489 | * fribidi_map: 0 1 -1 -1 4 5 -1 7 8 9 10 11 |
| 490 | * fribidi_to_term: 0 1 -1 -1 2 3 -1 4 5 6 7 9 |
| 491 | * |
| 492 | * Embedding levels and other properties (shaping etc.) are looked up: |
| 493 | * [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] |
| 494 | * fribidi_levels: 0 1 1 1 1 1 1 1 2 2 1 1 |
| 495 | * |
| 496 | * The steps above were per-paragraph. The steps below are per-line. |
| 497 | * |
| 498 | * After fribidi_reorder_line (only this array gets shuffled): |
| 499 | * [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] |
| 500 | * fribidi_map: 0 11 10 8 9 7 5 -1 4 1 -1 -1 |
| 501 | * |
| 502 | * To get the visual order: walk in the new fribidi_map, and for each real entry look up the |
| 503 | * logical terminal column using fribidi_to_term: |
| 504 | * - map[0] is 0, to_term[0] is 0, hence visual column 0 belongs to logical column 0 (A) |
| 505 | * - map[1] is 11, to_term[11] is 9, hence visual column 1 belongs to logical column 9 (Alef) |
| 506 | * - map[2] is 10, to_term[10] is 7, row_data[7] is the "<" sign |
| 507 | * - this is a double wide character, we need to map the next two visual cells to two logical cells |
| 508 | * - due to levels[10] being odd, this character has a resolved RTL direction |
| 509 | * - thus we map in reverse order: visual 2 <=> logical 8, visual 3 <=> logical 7 |
| 510 | * - the glyph is also mirrorable, it'll be displayed accordingly |
| 511 | * - [3] -> 8 -> 5, so visual 4 <=> logical 5 (One) |
| 512 | * - [4] -> 9 -> 6, so visual 5 <=> logical 6 (Two) |
| 513 | * - [5] -> 7 -> 4, so visual 6 <=> logical 4 (Mem, the last, leftmost letter of Shalom) |
| 514 | * - [6] -> 5 -> 3, so visual 7 <=> logical 3 (Vav+hol) |
| 515 | * - [7] -> -1, skipped |
| 516 | * - [8] -> 4 -> 2, so visual 8 <=> logical 2 (Lam) |
| 517 | * - [9] -> 1 -> 1, so visual 9 <=> logical 1 (Shin+qam+dot, the first, rightmost letter of Shalom) |
| 518 | * - [10] -> -1, skipped |
| 519 | * - [11] -> -1, skipped |
| 520 | * |
| 521 | * Silly FriBidi API almost allows us to skip one level of indirection, by placing the to_term values |
| 522 | * in the map to be shuffled. However, we can't get the embedding levels then. |
| 523 | * TODO: File an issue for a better API. |
| 524 | */ |
| 525 | for (row = start; row < end; row++) { |
| 526 | row_data = m_ringview->get_row(row); |
| 527 | |
| 528 | for (tl = 0; tl < row_data->len; tl++) { |
| 529 | auto prev_len = fribidi_chars_array->len; |
| 530 | FriBidiStrIndex val; |
| 531 | |
| 532 | cell = _bte_row_data_get (row_data, tl); |
| 533 | if (cell->attr.fragment()) |
| 534 | continue; |
| 535 | |
| 536 | /* Extract the base character and combining accents. |
| 537 | * Convert mid-line erased cells to spaces. |
| 538 | * Note: see the static assert at the top of this file. */ |
| 539 | _bte_unistr_append_to_gunichars (cell->c ? cell->c : ' ', fribidi_chars_array); |
| 540 | /* Make sure at least one character was produced. */ |
| 541 | g_assert_cmpint (fribidi_chars_array->len, >, prev_len)do { gint64 __n1 = (fribidi_chars_array->len), __n2 = (prev_len ); if (__n1 > __n2) ; else g_assertion_message_cmpnum ("BTE" , "../src/bidi.cc", 541, ((const char*) (__PRETTY_FUNCTION__) ), "fribidi_chars_array->len" " " ">" " " "prev_len", ( long double) __n1, ">", (long double) __n2, 'i'); } while ( 0); |
| 542 | |
| 543 | /* Track the base character, assign to it its current index in fribidi_chars. |
| 544 | * Don't track combining accents, assign -1's to them. */ |
| 545 | val = prev_len; |
| 546 | g_array_append_val (fribidi_map_array, val)g_array_append_vals (fribidi_map_array, &(val), 1); |
| 547 | val = tl; |
| 548 | g_array_append_val (fribidi_to_term_array, val)g_array_append_vals (fribidi_to_term_array, &(val), 1); |
| 549 | prev_len++; |
| 550 | val = -1; |
| 551 | while (prev_len++ < fribidi_chars_array->len) { |
| 552 | g_array_append_val (fribidi_map_array, val)g_array_append_vals (fribidi_map_array, &(val), 1); |
| 553 | g_array_append_val (fribidi_to_term_array, val)g_array_append_vals (fribidi_to_term_array, &(val), 1); |
| 554 | } |
| 555 | } |
| 556 | |
| 557 | lines[++line] = fribidi_chars_array->len; |
| 558 | } |
| 559 | |
| 560 | /* Convenience stuff, we no longer need the auto-growing GArray wrapper. */ |
| 561 | count = fribidi_chars_array->len; |
| 562 | fribidi_chars = (FriBidiChar *) fribidi_chars_array->data; |
| 563 | fribidi_map = (FriBidiStrIndex *) fribidi_map_array->data; |
| 564 | fribidi_to_term = (FriBidiStrIndex *) fribidi_to_term_array->data; |
| 565 | |
| 566 | /* Run the BiDi algorithm on the paragraph to get the embedding levels. */ |
| 567 | fribidi_chartypes = g_newa (FriBidiCharType, count)((FriBidiCharType*) __builtin_alloca (sizeof (FriBidiCharType ) * (gsize) (count))); |
| 568 | fribidi_brackettypes = g_newa (FriBidiBracketType, count)((FriBidiBracketType*) __builtin_alloca (sizeof (FriBidiBracketType ) * (gsize) (count))); |
| 569 | fribidi_joiningtypes = g_newa (FriBidiJoiningType, count)((FriBidiJoiningType*) __builtin_alloca (sizeof (FriBidiJoiningType ) * (gsize) (count))); |
| 570 | fribidi_levels = g_newa (FriBidiLevel, count)((FriBidiLevel*) __builtin_alloca (sizeof (FriBidiLevel) * (gsize ) (count))); |
| 571 | |
| 572 | pbase_dir = autodir ? (rtl ? FRIBIDI_PAR_WRTL( 0x00000020L | 0x00000001L ) : FRIBIDI_PAR_WLTR( 0x00000020L )) |
| 573 | : (rtl ? FRIBIDI_PAR_RTL( 0x00000010L | 0x00000100L | 0x00000001L) : FRIBIDI_PAR_LTR( 0x00000010L | 0x00000100L ) ); |
| 574 | |
| 575 | fribidi_get_bidi_types (fribidi_chars, count, fribidi_chartypes); |
| 576 | fribidi_get_bracket_types (fribidi_chars, count, fribidi_chartypes, fribidi_brackettypes); |
| 577 | fribidi_get_joining_types (fribidi_chars, count, fribidi_joiningtypes); |
| 578 | level = fribidi_get_par_embedding_levels_ex (fribidi_chartypes, fribidi_brackettypes, count, &pbase_dir, fribidi_levels) - 1; |
| 579 | |
| 580 | if (level == (FriBidiLevel)(-1)) { |
| 581 | /* error */ |
| 582 | g_array_free (fribidi_chars_array, TRUE(!(0))); |
| 583 | g_array_free (fribidi_map_array, TRUE(!(0))); |
| 584 | g_array_free (fribidi_to_term_array, TRUE(!(0))); |
| 585 | return false; |
| 586 | } |
| 587 | |
| 588 | if (do_shaping) { |
| 589 | /* Arabic shaping (on the entire paragraph in a single run). */ |
| 590 | fribidi_join_arabic (fribidi_chartypes, count, fribidi_levels, fribidi_joiningtypes); |
| 591 | fribidi_shape_arabic (BTE_ARABIC_SHAPING_FLAGS(( 0x00000100 | 0x00000200 ) & ~0x00000200), fribidi_levels, count, fribidi_joiningtypes, fribidi_chars); |
| 592 | } |
| 593 | |
| 594 | /* For convenience, from now on this variable contains the resolved (i.e. possibly autodetected) value. */ |
| 595 | g_assert_cmpint (pbase_dir, !=, FRIBIDI_PAR_ON)do { gint64 __n1 = (pbase_dir), __n2 = (( 0x00000040L )); if ( __n1 != __n2) ; else g_assertion_message_cmpnum ("BTE", "../src/bidi.cc" , 595, ((const char*) (__PRETTY_FUNCTION__)), "pbase_dir" " " "!=" " " "FRIBIDI_PAR_ON", (long double) __n1, "!=", (long double ) __n2, 'i'); } while (0); |
| 596 | rtl = (pbase_dir == FRIBIDI_PAR_RTL( 0x00000010L | 0x00000100L | 0x00000001L) || pbase_dir == FRIBIDI_PAR_WRTL( 0x00000020L | 0x00000001L )); |
| 597 | |
| 598 | if (!rtl && level == 0) { |
| 599 | /* Fast and memory saving shortcut for LTR-only paragraphs. */ |
| 600 | g_array_free (fribidi_chars_array, TRUE(!(0))); |
| 601 | g_array_free (fribidi_map_array, TRUE(!(0))); |
| 602 | g_array_free (fribidi_to_term_array, TRUE(!(0))); |
| 603 | explicit_paragraph (start, end, false, false); |
| 604 | return true; |
| 605 | } |
| 606 | |
| 607 | /* Check if the paragraph has a foreign directionality character. In fact, also catch |
| 608 | * and treat it so if the paragraph has a mixture of multiple embedding levels, even if all |
| 609 | * of them has the same parity (direction). */ |
| 610 | if (!rtl) { |
| 611 | /* LTR. We already bailed out above if level == 0, so there must be a character |
| 612 | * with a higher embedding level. */ |
| 613 | has_foreign = true; |
| 614 | } else { |
| 615 | /* RTL. Check if any character has a level other than 1. Check the paragraph's |
| 616 | * maximum level as a shortcut, but note that in case of an empty paragraph |
| 617 | * its value is 0 rather than 1. */ |
| 618 | if (level <= 1) { |
| 619 | has_foreign = false; |
| 620 | for (int i = 0; i < count; i++) { |
| 621 | if (fribidi_levels[i] != 1) { |
| 622 | has_foreign = true; |
| 623 | break; |
| 624 | } |
| 625 | } |
| 626 | } else { |
| 627 | has_foreign = true; |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | /* Reshuffle line by line. */ |
| 632 | for (row = start, line = 0; row < end; row++, line++) { |
| 633 | bidirow = m_ringview->get_bidirow_writable(row); |
| 634 | if (bidirow == nullptr) |
| 635 | continue; |
| 636 | |
| 637 | bidirow->m_base_rtl = rtl; |
| 638 | bidirow->m_has_foreign = has_foreign; |
| 639 | bidirow->set_width(width); |
| 640 | |
| 641 | row_data = m_ringview->get_row(row); |
| 642 | |
| 643 | level = fribidi_reorder_line (FRIBIDI_FLAGS_DEFAULT( 0x00000001 | 0x00000002 | 0x00040000 ), |
| 644 | fribidi_chartypes, |
| 645 | lines[line + 1] - lines[line], |
| 646 | lines[line], |
| 647 | pbase_dir, |
| 648 | fribidi_levels, |
| 649 | NULL__null, |
| 650 | fribidi_map) - 1; |
| 651 | |
| 652 | if (level == (FriBidiLevel)(-1)) { |
| 653 | /* error, what should we do? */ |
| 654 | explicit_line (row, rtl, true); |
| 655 | bidirow->m_has_foreign = has_foreign; |
| 656 | continue; |
| 657 | } |
| 658 | |
| 659 | if (!rtl && level == 0) { |
| 660 | /* Fast shortcut for LTR-only lines. */ |
| 661 | explicit_line (row, false, false); |
| 662 | bidirow->m_has_foreign = has_foreign; |
| 663 | continue; |
| 664 | } |
| 665 | |
| 666 | /* Copy to our realm. Proceed in visual order.*/ |
| 667 | tv = 0; |
| 668 | if (rtl) { |
| 669 | /* Unused cells on the left for RTL paragraphs */ |
| 670 | int unused = width - row_data->len; |
| 671 | for (; tv < unused; tv++) { |
| 672 | bidirow->m_vis2log[tv] = width - 1 - tv; |
| 673 | bidirow->m_vis_rtl[tv] = true; |
| 674 | bidirow->m_vis_shaped_base_char[tv] = 0; |
| 675 | } |
| 676 | } |
| 677 | for (fv = lines[line]; fv < lines[line + 1]; fv++) { |
| 678 | /* Inflate fribidi's result by inserting fragments. */ |
| 679 | fl = fribidi_map[fv]; |
| 680 | if (fl == -1) |
| 681 | continue; |
| 682 | tl = fribidi_to_term[fl]; |
| 683 | cell = _bte_row_data_get (row_data, tl); |
| 684 | g_assert (!cell->attr.fragment())do { if (__builtin_expect (__extension__ ({ int _g_boolean_var_ ; if (!cell->attr.fragment()) _g_boolean_var_ = 1; else _g_boolean_var_ = 0; _g_boolean_var_; }), 1)) ; else g_assertion_message_expr ("BTE", "../src/bidi.cc", 684, ((const char*) (__PRETTY_FUNCTION__ )), "!cell->attr.fragment()"); } while (0); |
| 685 | g_assert (cell->attr.columns() > 0)do { if (__builtin_expect (__extension__ ({ int _g_boolean_var_ ; if (cell->attr.columns() > 0) _g_boolean_var_ = 1; else _g_boolean_var_ = 0; _g_boolean_var_; }), 1)) ; else g_assertion_message_expr ("BTE", "../src/bidi.cc", 685, ((const char*) (__PRETTY_FUNCTION__ )), "cell->attr.columns() > 0"); } while (0); |
| 686 | if (FRIBIDI_LEVEL_IS_RTL(fribidi_levels[fl])((fribidi_levels[fl]) & 1)) { |
| 687 | /* RTL character directionality. Map fragments in reverse order. */ |
| 688 | for (col = 0; col < cell->attr.columns(); col++) { |
| 689 | bidirow->m_vis2log[tv + col] = tl + cell->attr.columns() - 1 - col; |
| 690 | bidirow->m_vis_rtl[tv + col] = true; |
| 691 | bidirow->m_vis_shaped_base_char[tv + col] = fribidi_chars[fl]; |
| 692 | } |
| 693 | tv += cell->attr.columns(); |
| 694 | tl += cell->attr.columns(); |
Value stored to 'tl' is never read | |
| 695 | } else { |
| 696 | /* LTR character directionality. */ |
| 697 | for (col = 0; col < cell->attr.columns(); col++) { |
| 698 | bidirow->m_vis2log[tv] = tl; |
| 699 | bidirow->m_vis_rtl[tv] = false; |
| 700 | bidirow->m_vis_shaped_base_char[tv] = fribidi_chars[fl]; |
| 701 | tv++; |
| 702 | tl++; |
| 703 | } |
| 704 | } |
| 705 | } |
| 706 | if (!rtl) { |
| 707 | /* Unused cells on the right for LTR paragraphs */ |
| 708 | g_assert_cmpint (tv, ==, row_data->len)do { gint64 __n1 = (tv), __n2 = (row_data->len); if (__n1 == __n2) ; else g_assertion_message_cmpnum ("BTE", "../src/bidi.cc" , 708, ((const char*) (__PRETTY_FUNCTION__)), "tv" " " "==" " " "row_data->len", (long double) __n1, "==", (long double) __n2 , 'i'); } while (0); |
| 709 | for (; tv < width; tv++) { |
| 710 | bidirow->m_vis2log[tv] = tv; |
| 711 | bidirow->m_vis_rtl[tv] = false; |
| 712 | bidirow->m_vis_shaped_base_char[tv] = 0; |
| 713 | } |
| 714 | } |
| 715 | g_assert_cmpint (tv, ==, width)do { gint64 __n1 = (tv), __n2 = (width); if (__n1 == __n2) ; else g_assertion_message_cmpnum ("BTE", "../src/bidi.cc", 715, (( const char*) (__PRETTY_FUNCTION__)), "tv" " " "==" " " "width" , (long double) __n1, "==", (long double) __n2, 'i'); } while (0); |
| 716 | |
| 717 | /* From vis2log create the log2vis mapping too. |
| 718 | * In debug mode assert that we have a bijective mapping. */ |
| 719 | if (_bte_debug_on (BTE_DEBUG_BIDI)) { |
| 720 | for (tl = 0; tl < width; tl++) { |
| 721 | bidirow->m_log2vis[tl] = -1; |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | for (tv = 0; tv < width; tv++) { |
| 726 | bidirow->m_log2vis[bidirow->m_vis2log[tv]] = tv; |
| 727 | } |
| 728 | |
| 729 | if (_bte_debug_on (BTE_DEBUG_BIDI)) { |
| 730 | for (tl = 0; tl < width; tl++) { |
| 731 | g_assert_cmpint (bidirow->m_log2vis[tl], !=, -1)do { gint64 __n1 = (bidirow->m_log2vis[tl]), __n2 = (-1); if (__n1 != __n2) ; else g_assertion_message_cmpnum ("BTE", "../src/bidi.cc" , 731, ((const char*) (__PRETTY_FUNCTION__)), "bidirow->m_log2vis[tl]" " " "!=" " " "-1", (long double) __n1, "!=", (long double) __n2 , 'i'); } while (0); |
| 732 | } |
| 733 | } |
| 734 | } |
| 735 | |
| 736 | g_array_free (fribidi_chars_array, TRUE(!(0))); |
| 737 | g_array_free (fribidi_map_array, TRUE(!(0))); |
| 738 | g_array_free (fribidi_to_term_array, TRUE(!(0))); |
| 739 | return true; |
| 740 | } |
| 741 | #endif /* WITH_FRIBIDI */ |
| 742 | |
| 743 | |
| 744 | /* Find the mirrored counterpart of a codepoint, just like |
| 745 | * fribidi_get_mirror_char() or g_unichar_get_mirror_char() does. |
| 746 | * Two additions: |
| 747 | * - works with bteunistr, that is, preserves combining accents; |
| 748 | * - optionally mirrors box drawing characters. |
| 749 | */ |
| 750 | gboolean |
| 751 | bte_bidi_get_mirror_char (bteunistr unistr, gboolean mirror_box_drawing, bteunistr *out) |
| 752 | { |
| 753 | static const unsigned char mirrored_2500[0x80] = { |
| 754 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x10, 0x11, 0x12, 0x13, |
| 755 | 0x0c, 0x0d, 0x0e, 0x0f, 0x18, 0x19, 0x1a, 0x1b, 0x14, 0x15, 0x16, 0x17, 0x24, 0x25, 0x26, 0x27, |
| 756 | 0x28, 0x29, 0x2a, 0x2b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x2c, 0x2e, 0x2d, 0x2f, |
| 757 | 0x30, 0x32, 0x31, 0x33, 0x34, 0x36, 0x35, 0x37, 0x38, 0x3a, 0x39, 0x3b, 0x3c, 0x3e, 0x3d, 0x3f, |
| 758 | 0x40, 0x41, 0x42, 0x44, 0x43, 0x46, 0x45, 0x47, 0x48, 0x4a, 0x49, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, |
| 759 | 0x50, 0x51, 0x55, 0x56, 0x57, 0x52, 0x53, 0x54, 0x5b, 0x5c, 0x5d, 0x58, 0x59, 0x5a, 0x61, 0x62, |
| 760 | 0x63, 0x5e, 0x5f, 0x60, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6e, 0x6d, 0x70, |
| 761 | 0x6f, 0x72, 0x71, 0x73, 0x76, 0x75, 0x74, 0x77, 0x7a, 0x79, 0x78, 0x7b, 0x7e, 0x7d, 0x7c, 0x7f }; |
| 762 | |
| 763 | gunichar base_ch = _bte_unistr_get_base (unistr); |
| 764 | gunichar base_ch_mirrored = base_ch; |
| 765 | |
| 766 | if (G_UNLIKELY (base_ch >= 0x2500 && base_ch < 0x2580)(__builtin_expect (__extension__ ({ int _g_boolean_var_; if ( base_ch >= 0x2500 && base_ch < 0x2580) _g_boolean_var_ = 1; else _g_boolean_var_ = 0; _g_boolean_var_; }), 0))) { |
| 767 | if (G_UNLIKELY (mirror_box_drawing)(__builtin_expect (__extension__ ({ int _g_boolean_var_; if ( mirror_box_drawing) _g_boolean_var_ = 1; else _g_boolean_var_ = 0; _g_boolean_var_; }), 0))) |
| 768 | base_ch_mirrored = 0x2500 + mirrored_2500[base_ch - 0x2500]; |
| 769 | } else { |
| 770 | #ifdef WITH_FRIBIDI |
| 771 | /* Prefer the FriBidi variant as that's more likely to be in sync with the rest of our BiDi stuff. */ |
| 772 | fribidi_get_mirror_char (base_ch, &base_ch_mirrored); |
| 773 | #else |
| 774 | /* Fall back to glib, so that we still get mirrored characters in explicit RTL mode without BiDi support. */ |
| 775 | g_unichar_get_mirror_char (base_ch, &base_ch_mirrored); |
| 776 | #endif |
| 777 | } |
| 778 | |
| 779 | bteunistr unistr_mirrored = _bte_unistr_replace_base (unistr, base_ch_mirrored); |
| 780 | |
| 781 | if (out) |
| 782 | *out = unistr_mirrored; |
| 783 | return unistr_mirrored == unistr; |
| 784 | } |