1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/harfbuzz/src/hb-ot-shape.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,751 @@
1.4 +/*
1.5 + * Copyright © 2009,2010 Red Hat, Inc.
1.6 + * Copyright © 2010,2011,2012 Google, Inc.
1.7 + *
1.8 + * This is part of HarfBuzz, a text shaping library.
1.9 + *
1.10 + * Permission is hereby granted, without written agreement and without
1.11 + * license or royalty fees, to use, copy, modify, and distribute this
1.12 + * software and its documentation for any purpose, provided that the
1.13 + * above copyright notice and the following two paragraphs appear in
1.14 + * all copies of this software.
1.15 + *
1.16 + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
1.17 + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
1.18 + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
1.19 + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
1.20 + * DAMAGE.
1.21 + *
1.22 + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
1.23 + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
1.24 + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
1.25 + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
1.26 + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
1.27 + *
1.28 + * Red Hat Author(s): Behdad Esfahbod
1.29 + * Google Author(s): Behdad Esfahbod
1.30 + */
1.31 +
1.32 +#define HB_SHAPER ot
1.33 +#define hb_ot_shaper_face_data_t hb_ot_layout_t
1.34 +#define hb_ot_shaper_shape_plan_data_t hb_ot_shape_plan_t
1.35 +#include "hb-shaper-impl-private.hh"
1.36 +
1.37 +#include "hb-ot-shape-private.hh"
1.38 +#include "hb-ot-shape-complex-private.hh"
1.39 +#include "hb-ot-shape-fallback-private.hh"
1.40 +#include "hb-ot-shape-normalize-private.hh"
1.41 +
1.42 +#include "hb-ot-layout-private.hh"
1.43 +#include "hb-set-private.hh"
1.44 +
1.45 +
1.46 +static hb_tag_t common_features[] = {
1.47 + HB_TAG('c','c','m','p'),
1.48 + HB_TAG('l','i','g','a'),
1.49 + HB_TAG('l','o','c','l'),
1.50 + HB_TAG('m','a','r','k'),
1.51 + HB_TAG('m','k','m','k'),
1.52 + HB_TAG('r','l','i','g'),
1.53 +};
1.54 +
1.55 +
1.56 +static hb_tag_t horizontal_features[] = {
1.57 + HB_TAG('c','a','l','t'),
1.58 + HB_TAG('c','l','i','g'),
1.59 + HB_TAG('c','u','r','s'),
1.60 + HB_TAG('k','e','r','n'),
1.61 + HB_TAG('r','c','l','t'),
1.62 +};
1.63 +
1.64 +static hb_tag_t vertical_features[] = {
1.65 + HB_TAG('v','e','r','t'),
1.66 +};
1.67 +
1.68 +
1.69 +
1.70 +static void
1.71 +hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner,
1.72 + const hb_segment_properties_t *props,
1.73 + const hb_feature_t *user_features,
1.74 + unsigned int num_user_features)
1.75 +{
1.76 + hb_ot_map_builder_t *map = &planner->map;
1.77 +
1.78 + switch (props->direction) {
1.79 + case HB_DIRECTION_LTR:
1.80 + map->add_global_bool_feature (HB_TAG ('l','t','r','a'));
1.81 + map->add_global_bool_feature (HB_TAG ('l','t','r','m'));
1.82 + break;
1.83 + case HB_DIRECTION_RTL:
1.84 + map->add_global_bool_feature (HB_TAG ('r','t','l','a'));
1.85 + map->add_feature (HB_TAG ('r','t','l','m'), 1, F_NONE);
1.86 + break;
1.87 + case HB_DIRECTION_TTB:
1.88 + case HB_DIRECTION_BTT:
1.89 + case HB_DIRECTION_INVALID:
1.90 + default:
1.91 + break;
1.92 + }
1.93 +
1.94 + map->add_feature (HB_TAG ('f','r','a','c'), 1, F_NONE);
1.95 + map->add_feature (HB_TAG ('n','u','m','r'), 1, F_NONE);
1.96 + map->add_feature (HB_TAG ('d','n','o','m'), 1, F_NONE);
1.97 +
1.98 + if (planner->shaper->collect_features)
1.99 + planner->shaper->collect_features (planner);
1.100 +
1.101 + for (unsigned int i = 0; i < ARRAY_LENGTH (common_features); i++)
1.102 + map->add_global_bool_feature (common_features[i]);
1.103 +
1.104 + if (HB_DIRECTION_IS_HORIZONTAL (props->direction))
1.105 + for (unsigned int i = 0; i < ARRAY_LENGTH (horizontal_features); i++)
1.106 + map->add_feature (horizontal_features[i], 1, F_GLOBAL |
1.107 + (horizontal_features[i] == HB_TAG('k','e','r','n') ?
1.108 + F_HAS_FALLBACK : F_NONE));
1.109 + else
1.110 + for (unsigned int i = 0; i < ARRAY_LENGTH (vertical_features); i++)
1.111 + map->add_feature (vertical_features[i], 1, F_GLOBAL |
1.112 + (vertical_features[i] == HB_TAG('v','k','r','n') ?
1.113 + F_HAS_FALLBACK : F_NONE));
1.114 +
1.115 + if (planner->shaper->override_features)
1.116 + planner->shaper->override_features (planner);
1.117 +
1.118 + for (unsigned int i = 0; i < num_user_features; i++) {
1.119 + const hb_feature_t *feature = &user_features[i];
1.120 + map->add_feature (feature->tag, feature->value,
1.121 + (feature->start == 0 && feature->end == (unsigned int) -1) ?
1.122 + F_GLOBAL : F_NONE);
1.123 + }
1.124 +}
1.125 +
1.126 +
1.127 +/*
1.128 + * shaper face data
1.129 + */
1.130 +
1.131 +hb_ot_shaper_face_data_t *
1.132 +_hb_ot_shaper_face_data_create (hb_face_t *face)
1.133 +{
1.134 + return _hb_ot_layout_create (face);
1.135 +}
1.136 +
1.137 +void
1.138 +_hb_ot_shaper_face_data_destroy (hb_ot_shaper_face_data_t *data)
1.139 +{
1.140 + _hb_ot_layout_destroy (data);
1.141 +}
1.142 +
1.143 +
1.144 +/*
1.145 + * shaper font data
1.146 + */
1.147 +
1.148 +struct hb_ot_shaper_font_data_t {};
1.149 +
1.150 +hb_ot_shaper_font_data_t *
1.151 +_hb_ot_shaper_font_data_create (hb_font_t *font)
1.152 +{
1.153 + return (hb_ot_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
1.154 +}
1.155 +
1.156 +void
1.157 +_hb_ot_shaper_font_data_destroy (hb_ot_shaper_font_data_t *data)
1.158 +{
1.159 +}
1.160 +
1.161 +
1.162 +/*
1.163 + * shaper shape_plan data
1.164 + */
1.165 +
1.166 +hb_ot_shaper_shape_plan_data_t *
1.167 +_hb_ot_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan,
1.168 + const hb_feature_t *user_features,
1.169 + unsigned int num_user_features)
1.170 +{
1.171 + hb_ot_shape_plan_t *plan = (hb_ot_shape_plan_t *) calloc (1, sizeof (hb_ot_shape_plan_t));
1.172 + if (unlikely (!plan))
1.173 + return NULL;
1.174 +
1.175 + hb_ot_shape_planner_t planner (shape_plan);
1.176 +
1.177 + planner.shaper = hb_ot_shape_complex_categorize (&planner);
1.178 +
1.179 + hb_ot_shape_collect_features (&planner, &shape_plan->props, user_features, num_user_features);
1.180 +
1.181 + planner.compile (*plan);
1.182 +
1.183 + if (plan->shaper->data_create) {
1.184 + plan->data = plan->shaper->data_create (plan);
1.185 + if (unlikely (!plan->data))
1.186 + return NULL;
1.187 + }
1.188 +
1.189 + return plan;
1.190 +}
1.191 +
1.192 +void
1.193 +_hb_ot_shaper_shape_plan_data_destroy (hb_ot_shaper_shape_plan_data_t *plan)
1.194 +{
1.195 + if (plan->shaper->data_destroy)
1.196 + plan->shaper->data_destroy (const_cast<void *> (plan->data));
1.197 +
1.198 + plan->finish ();
1.199 +
1.200 + free (plan);
1.201 +}
1.202 +
1.203 +
1.204 +/*
1.205 + * shaper
1.206 + */
1.207 +
1.208 +struct hb_ot_shape_context_t
1.209 +{
1.210 + hb_ot_shape_plan_t *plan;
1.211 + hb_font_t *font;
1.212 + hb_face_t *face;
1.213 + hb_buffer_t *buffer;
1.214 + const hb_feature_t *user_features;
1.215 + unsigned int num_user_features;
1.216 +
1.217 + /* Transient stuff */
1.218 + hb_direction_t target_direction;
1.219 +};
1.220 +
1.221 +
1.222 +
1.223 +/* Main shaper */
1.224 +
1.225 +
1.226 +/* Prepare */
1.227 +
1.228 +static void
1.229 +hb_set_unicode_props (hb_buffer_t *buffer)
1.230 +{
1.231 + unsigned int count = buffer->len;
1.232 + for (unsigned int i = 0; i < count; i++)
1.233 + _hb_glyph_info_set_unicode_props (&buffer->info[i], buffer->unicode);
1.234 +}
1.235 +
1.236 +static void
1.237 +hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font)
1.238 +{
1.239 + if (!(buffer->flags & HB_BUFFER_FLAG_BOT) ||
1.240 + _hb_glyph_info_get_general_category (&buffer->info[0]) !=
1.241 + HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
1.242 + return;
1.243 +
1.244 + if (!font->has_glyph (0x25CC))
1.245 + return;
1.246 +
1.247 + hb_glyph_info_t dottedcircle;
1.248 + dottedcircle.codepoint = 0x25CC;
1.249 + _hb_glyph_info_set_unicode_props (&dottedcircle, buffer->unicode);
1.250 +
1.251 + buffer->clear_output ();
1.252 +
1.253 + buffer->idx = 0;
1.254 + hb_glyph_info_t info = dottedcircle;
1.255 + info.cluster = buffer->cur().cluster;
1.256 + info.mask = buffer->cur().mask;
1.257 + buffer->output_info (info);
1.258 + while (buffer->idx < buffer->len)
1.259 + buffer->next_glyph ();
1.260 +
1.261 + buffer->swap_buffers ();
1.262 +}
1.263 +
1.264 +static void
1.265 +hb_form_clusters (hb_buffer_t *buffer)
1.266 +{
1.267 + unsigned int count = buffer->len;
1.268 + for (unsigned int i = 1; i < count; i++)
1.269 + if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&buffer->info[i])))
1.270 + buffer->merge_clusters (i - 1, i + 1);
1.271 +}
1.272 +
1.273 +static void
1.274 +hb_ensure_native_direction (hb_buffer_t *buffer)
1.275 +{
1.276 + hb_direction_t direction = buffer->props.direction;
1.277 +
1.278 + /* TODO vertical:
1.279 + * The only BTT vertical script is Ogham, but it's not clear to me whether OpenType
1.280 + * Ogham fonts are supposed to be implemented BTT or not. Need to research that
1.281 + * first. */
1.282 + if ((HB_DIRECTION_IS_HORIZONTAL (direction) && direction != hb_script_get_horizontal_direction (buffer->props.script)) ||
1.283 + (HB_DIRECTION_IS_VERTICAL (direction) && direction != HB_DIRECTION_TTB))
1.284 + {
1.285 + hb_buffer_reverse_clusters (buffer);
1.286 + buffer->props.direction = HB_DIRECTION_REVERSE (buffer->props.direction);
1.287 + }
1.288 +}
1.289 +
1.290 +
1.291 +/* Substitute */
1.292 +
1.293 +static inline void
1.294 +hb_ot_mirror_chars (hb_ot_shape_context_t *c)
1.295 +{
1.296 + if (HB_DIRECTION_IS_FORWARD (c->target_direction))
1.297 + return;
1.298 +
1.299 + hb_buffer_t *buffer = c->buffer;
1.300 + hb_unicode_funcs_t *unicode = buffer->unicode;
1.301 + hb_mask_t rtlm_mask = c->plan->rtlm_mask;
1.302 +
1.303 + unsigned int count = buffer->len;
1.304 + hb_glyph_info_t *info = buffer->info;
1.305 + for (unsigned int i = 0; i < count; i++) {
1.306 + hb_codepoint_t codepoint = unicode->mirroring (info[i].codepoint);
1.307 + if (likely (codepoint == info[i].codepoint))
1.308 + info[i].mask |= rtlm_mask;
1.309 + else
1.310 + info[i].codepoint = codepoint;
1.311 + }
1.312 +}
1.313 +
1.314 +static inline void
1.315 +hb_ot_shape_setup_masks_fraction (hb_ot_shape_context_t *c)
1.316 +{
1.317 + if (!c->plan->has_frac)
1.318 + return;
1.319 +
1.320 + hb_buffer_t *buffer = c->buffer;
1.321 +
1.322 + /* TODO look in pre/post context text also. */
1.323 + unsigned int count = buffer->len;
1.324 + hb_glyph_info_t *info = buffer->info;
1.325 + for (unsigned int i = 0; i < count; i++)
1.326 + {
1.327 + if (info[i].codepoint == 0x2044) /* FRACTION SLASH */
1.328 + {
1.329 + unsigned int start = i, end = i + 1;
1.330 + while (start &&
1.331 + _hb_glyph_info_get_general_category (&info[start - 1]) ==
1.332 + HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
1.333 + start--;
1.334 + while (end < count &&
1.335 + _hb_glyph_info_get_general_category (&info[end]) ==
1.336 + HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER)
1.337 + end++;
1.338 +
1.339 + for (unsigned int j = start; j < i; j++)
1.340 + info[j].mask |= c->plan->numr_mask | c->plan->frac_mask;
1.341 + info[i].mask |= c->plan->frac_mask;
1.342 + for (unsigned int j = i + 1; j < end; j++)
1.343 + info[j].mask |= c->plan->frac_mask | c->plan->dnom_mask;
1.344 +
1.345 + i = end - 1;
1.346 + }
1.347 + }
1.348 +}
1.349 +
1.350 +static inline void
1.351 +hb_ot_shape_initialize_masks (hb_ot_shape_context_t *c)
1.352 +{
1.353 + hb_ot_map_t *map = &c->plan->map;
1.354 + hb_buffer_t *buffer = c->buffer;
1.355 +
1.356 + hb_mask_t global_mask = map->get_global_mask ();
1.357 + buffer->reset_masks (global_mask);
1.358 +}
1.359 +
1.360 +static inline void
1.361 +hb_ot_shape_setup_masks (hb_ot_shape_context_t *c)
1.362 +{
1.363 + hb_ot_map_t *map = &c->plan->map;
1.364 + hb_buffer_t *buffer = c->buffer;
1.365 +
1.366 + hb_ot_shape_setup_masks_fraction (c);
1.367 +
1.368 + if (c->plan->shaper->setup_masks)
1.369 + c->plan->shaper->setup_masks (c->plan, buffer, c->font);
1.370 +
1.371 + for (unsigned int i = 0; i < c->num_user_features; i++)
1.372 + {
1.373 + const hb_feature_t *feature = &c->user_features[i];
1.374 + if (!(feature->start == 0 && feature->end == (unsigned int)-1)) {
1.375 + unsigned int shift;
1.376 + hb_mask_t mask = map->get_mask (feature->tag, &shift);
1.377 + buffer->set_masks (feature->value << shift, mask, feature->start, feature->end);
1.378 + }
1.379 + }
1.380 +}
1.381 +
1.382 +static inline void
1.383 +hb_ot_map_glyphs_fast (hb_buffer_t *buffer)
1.384 +{
1.385 + /* Normalization process sets up glyph_index(), we just copy it. */
1.386 + unsigned int count = buffer->len;
1.387 + for (unsigned int i = 0; i < count; i++)
1.388 + buffer->info[i].codepoint = buffer->info[i].glyph_index();
1.389 +}
1.390 +
1.391 +static inline void
1.392 +hb_synthesize_glyph_classes (hb_ot_shape_context_t *c)
1.393 +{
1.394 + unsigned int count = c->buffer->len;
1.395 + hb_glyph_info_t *info = c->buffer->info;
1.396 + for (unsigned int i = 0; i < count; i++)
1.397 + _hb_glyph_info_set_glyph_props (&info[i],
1.398 + _hb_glyph_info_get_general_category (&info[i])
1.399 + == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK ?
1.400 + HB_OT_LAYOUT_GLYPH_PROPS_MARK :
1.401 + HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH);
1.402 +}
1.403 +
1.404 +static inline void
1.405 +hb_ot_substitute_default (hb_ot_shape_context_t *c)
1.406 +{
1.407 + hb_buffer_t *buffer = c->buffer;
1.408 +
1.409 + if (c->plan->shaper->preprocess_text)
1.410 + c->plan->shaper->preprocess_text (c->plan, buffer, c->font);
1.411 +
1.412 + hb_ot_shape_initialize_masks (c);
1.413 +
1.414 + hb_ot_mirror_chars (c);
1.415 +
1.416 + HB_BUFFER_ALLOCATE_VAR (buffer, glyph_index);
1.417 +
1.418 + _hb_ot_shape_normalize (c->plan, buffer, c->font);
1.419 +
1.420 + hb_ot_shape_setup_masks (c);
1.421 +
1.422 + /* This is unfortunate to go here, but necessary... */
1.423 + if (!hb_ot_layout_has_positioning (c->face))
1.424 + _hb_ot_shape_fallback_position_recategorize_marks (c->plan, c->font, buffer);
1.425 +
1.426 + hb_ot_map_glyphs_fast (buffer);
1.427 +
1.428 + HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_index);
1.429 +}
1.430 +
1.431 +static inline void
1.432 +hb_ot_substitute_complex (hb_ot_shape_context_t *c)
1.433 +{
1.434 + hb_buffer_t *buffer = c->buffer;
1.435 +
1.436 + hb_ot_layout_substitute_start (c->font, buffer);
1.437 +
1.438 + if (!hb_ot_layout_has_glyph_classes (c->face))
1.439 + hb_synthesize_glyph_classes (c);
1.440 +
1.441 + c->plan->substitute (c->font, buffer);
1.442 +
1.443 + hb_ot_layout_substitute_finish (c->font, buffer);
1.444 +
1.445 + return;
1.446 +}
1.447 +
1.448 +static inline void
1.449 +hb_ot_substitute (hb_ot_shape_context_t *c)
1.450 +{
1.451 + hb_ot_substitute_default (c);
1.452 + hb_ot_substitute_complex (c);
1.453 +}
1.454 +
1.455 +/* Position */
1.456 +
1.457 +static inline void
1.458 +zero_mark_widths_by_unicode (hb_buffer_t *buffer)
1.459 +{
1.460 + unsigned int count = buffer->len;
1.461 + for (unsigned int i = 0; i < count; i++)
1.462 + if (_hb_glyph_info_get_general_category (&buffer->info[i]) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
1.463 + {
1.464 + buffer->pos[i].x_advance = 0;
1.465 + buffer->pos[i].y_advance = 0;
1.466 + }
1.467 +}
1.468 +
1.469 +static inline void
1.470 +zero_mark_widths_by_gdef (hb_buffer_t *buffer)
1.471 +{
1.472 + unsigned int count = buffer->len;
1.473 + for (unsigned int i = 0; i < count; i++)
1.474 + if (_hb_glyph_info_is_mark (&buffer->info[i]))
1.475 + {
1.476 + buffer->pos[i].x_advance = 0;
1.477 + buffer->pos[i].y_advance = 0;
1.478 + }
1.479 +}
1.480 +
1.481 +static inline void
1.482 +hb_ot_position_default (hb_ot_shape_context_t *c)
1.483 +{
1.484 + hb_direction_t direction = c->buffer->props.direction;
1.485 + unsigned int count = c->buffer->len;
1.486 + hb_glyph_info_t *info = c->buffer->info;
1.487 + hb_glyph_position_t *pos = c->buffer->pos;
1.488 + for (unsigned int i = 0; i < count; i++)
1.489 + {
1.490 + c->font->get_glyph_advance_for_direction (info[i].codepoint,
1.491 + direction,
1.492 + &pos[i].x_advance,
1.493 + &pos[i].y_advance);
1.494 + c->font->subtract_glyph_origin_for_direction (info[i].codepoint,
1.495 + direction,
1.496 + &pos[i].x_offset,
1.497 + &pos[i].y_offset);
1.498 +
1.499 + }
1.500 +}
1.501 +
1.502 +static inline bool
1.503 +hb_ot_position_complex (hb_ot_shape_context_t *c)
1.504 +{
1.505 + bool ret = false;
1.506 + unsigned int count = c->buffer->len;
1.507 +
1.508 + switch (c->plan->shaper->zero_width_marks)
1.509 + {
1.510 + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY:
1.511 + zero_mark_widths_by_gdef (c->buffer);
1.512 + break;
1.513 +
1.514 + /* Not currently used for any shaper:
1.515 + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_EARLY:
1.516 + zero_mark_widths_by_unicode (c->buffer);
1.517 + break;
1.518 + */
1.519 +
1.520 + default:
1.521 + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
1.522 + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_LATE:
1.523 + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE:
1.524 + break;
1.525 + }
1.526 +
1.527 + if (hb_ot_layout_has_positioning (c->face))
1.528 + {
1.529 + hb_glyph_info_t *info = c->buffer->info;
1.530 + hb_glyph_position_t *pos = c->buffer->pos;
1.531 +
1.532 + /* Change glyph origin to what GPOS expects, apply GPOS, change it back. */
1.533 +
1.534 + for (unsigned int i = 0; i < count; i++) {
1.535 + c->font->add_glyph_origin_for_direction (info[i].codepoint,
1.536 + HB_DIRECTION_LTR,
1.537 + &pos[i].x_offset,
1.538 + &pos[i].y_offset);
1.539 + }
1.540 +
1.541 + c->plan->position (c->font, c->buffer);
1.542 +
1.543 + for (unsigned int i = 0; i < count; i++) {
1.544 + c->font->subtract_glyph_origin_for_direction (info[i].codepoint,
1.545 + HB_DIRECTION_LTR,
1.546 + &pos[i].x_offset,
1.547 + &pos[i].y_offset);
1.548 + }
1.549 +
1.550 + ret = true;
1.551 + }
1.552 +
1.553 + switch (c->plan->shaper->zero_width_marks)
1.554 + {
1.555 + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_LATE:
1.556 + zero_mark_widths_by_unicode (c->buffer);
1.557 + break;
1.558 +
1.559 + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE:
1.560 + zero_mark_widths_by_gdef (c->buffer);
1.561 + break;
1.562 +
1.563 + default:
1.564 + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
1.565 + //case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_EARLY:
1.566 + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY:
1.567 + break;
1.568 + }
1.569 +
1.570 + return ret;
1.571 +}
1.572 +
1.573 +static inline void
1.574 +hb_ot_position (hb_ot_shape_context_t *c)
1.575 +{
1.576 + hb_ot_layout_position_start (c->font, c->buffer);
1.577 +
1.578 + hb_ot_position_default (c);
1.579 +
1.580 + hb_bool_t fallback = !hb_ot_position_complex (c);
1.581 +
1.582 + hb_ot_layout_position_finish (c->font, c->buffer);
1.583 +
1.584 + if (fallback && c->plan->shaper->fallback_position)
1.585 + _hb_ot_shape_fallback_position (c->plan, c->font, c->buffer);
1.586 +
1.587 + if (HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction))
1.588 + hb_buffer_reverse (c->buffer);
1.589 +
1.590 + /* Visual fallback goes here. */
1.591 +
1.592 + if (fallback)
1.593 + _hb_ot_shape_fallback_kern (c->plan, c->font, c->buffer);
1.594 +}
1.595 +
1.596 +
1.597 +/* Post-process */
1.598 +
1.599 +static void
1.600 +hb_ot_hide_default_ignorables (hb_ot_shape_context_t *c)
1.601 +{
1.602 + if (c->buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES)
1.603 + return;
1.604 +
1.605 + hb_codepoint_t space;
1.606 + enum {
1.607 + SPACE_DONT_KNOW,
1.608 + SPACE_AVAILABLE,
1.609 + SPACE_UNAVAILABLE
1.610 + } space_status = SPACE_DONT_KNOW;
1.611 +
1.612 + unsigned int count = c->buffer->len;
1.613 + hb_glyph_info_t *info = c->buffer->info;
1.614 + hb_glyph_position_t *pos = c->buffer->pos;
1.615 + unsigned int j = 0;
1.616 + for (unsigned int i = 0; i < count; i++)
1.617 + {
1.618 + if (unlikely (!_hb_glyph_info_ligated (&info[i]) &&
1.619 + _hb_glyph_info_is_default_ignorable (&info[i])))
1.620 + {
1.621 + if (space_status == SPACE_DONT_KNOW)
1.622 + space_status = c->font->get_glyph (' ', 0, &space) ? SPACE_AVAILABLE : SPACE_UNAVAILABLE;
1.623 +
1.624 + if (space_status == SPACE_AVAILABLE)
1.625 + {
1.626 + info[i].codepoint = space;
1.627 + pos[i].x_advance = 0;
1.628 + pos[i].y_advance = 0;
1.629 + }
1.630 + else
1.631 + continue; /* Delete it. */
1.632 + }
1.633 + if (j != i)
1.634 + {
1.635 + info[j] = info[i];
1.636 + pos[j] = pos[i];
1.637 + }
1.638 + j++;
1.639 + }
1.640 + c->buffer->len = j;
1.641 +}
1.642 +
1.643 +
1.644 +/* Pull it all together! */
1.645 +
1.646 +static void
1.647 +hb_ot_shape_internal (hb_ot_shape_context_t *c)
1.648 +{
1.649 + c->buffer->deallocate_var_all ();
1.650 +
1.651 + /* Save the original direction, we use it later. */
1.652 + c->target_direction = c->buffer->props.direction;
1.653 +
1.654 + _hb_buffer_allocate_unicode_vars (c->buffer);
1.655 +
1.656 + c->buffer->clear_output ();
1.657 +
1.658 + hb_set_unicode_props (c->buffer);
1.659 + hb_insert_dotted_circle (c->buffer, c->font);
1.660 + hb_form_clusters (c->buffer);
1.661 +
1.662 + hb_ensure_native_direction (c->buffer);
1.663 +
1.664 + hb_ot_substitute (c);
1.665 + hb_ot_position (c);
1.666 +
1.667 + hb_ot_hide_default_ignorables (c);
1.668 +
1.669 + _hb_buffer_deallocate_unicode_vars (c->buffer);
1.670 +
1.671 + c->buffer->props.direction = c->target_direction;
1.672 +
1.673 + c->buffer->deallocate_var_all ();
1.674 +}
1.675 +
1.676 +
1.677 +hb_bool_t
1.678 +_hb_ot_shape (hb_shape_plan_t *shape_plan,
1.679 + hb_font_t *font,
1.680 + hb_buffer_t *buffer,
1.681 + const hb_feature_t *features,
1.682 + unsigned int num_features)
1.683 +{
1.684 + hb_ot_shape_context_t c = {HB_SHAPER_DATA_GET (shape_plan), font, font->face, buffer, features, num_features};
1.685 + hb_ot_shape_internal (&c);
1.686 +
1.687 + return true;
1.688 +}
1.689 +
1.690 +
1.691 +void
1.692 +hb_ot_shape_plan_collect_lookups (hb_shape_plan_t *shape_plan,
1.693 + hb_tag_t table_tag,
1.694 + hb_set_t *lookup_indexes /* OUT */)
1.695 +{
1.696 + /* XXX Does the first part always succeed? */
1.697 + HB_SHAPER_DATA_GET (shape_plan)->collect_lookups (table_tag, lookup_indexes);
1.698 +}
1.699 +
1.700 +
1.701 +/* TODO Move this to hb-ot-shape-normalize, make it do decompose, and make it public. */
1.702 +static void
1.703 +add_char (hb_font_t *font,
1.704 + hb_unicode_funcs_t *unicode,
1.705 + hb_bool_t mirror,
1.706 + hb_codepoint_t u,
1.707 + hb_set_t *glyphs)
1.708 +{
1.709 + hb_codepoint_t glyph;
1.710 + if (font->get_glyph (u, 0, &glyph))
1.711 + glyphs->add (glyph);
1.712 + if (mirror)
1.713 + {
1.714 + hb_codepoint_t m = unicode->mirroring (u);
1.715 + if (m != u && font->get_glyph (m, 0, &glyph))
1.716 + glyphs->add (glyph);
1.717 + }
1.718 +}
1.719 +
1.720 +
1.721 +void
1.722 +hb_ot_shape_glyphs_closure (hb_font_t *font,
1.723 + hb_buffer_t *buffer,
1.724 + const hb_feature_t *features,
1.725 + unsigned int num_features,
1.726 + hb_set_t *glyphs)
1.727 +{
1.728 + hb_ot_shape_plan_t plan;
1.729 +
1.730 + const char *shapers[] = {"ot", NULL};
1.731 + hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props,
1.732 + features, num_features, shapers);
1.733 +
1.734 + bool mirror = hb_script_get_horizontal_direction (buffer->props.script) == HB_DIRECTION_RTL;
1.735 +
1.736 + unsigned int count = buffer->len;
1.737 + for (unsigned int i = 0; i < count; i++)
1.738 + add_char (font, buffer->unicode, mirror, buffer->info[i].codepoint, glyphs);
1.739 +
1.740 + hb_set_t lookups;
1.741 + lookups.init ();
1.742 + hb_ot_shape_plan_collect_lookups (shape_plan, HB_OT_TAG_GSUB, &lookups);
1.743 +
1.744 + /* And find transitive closure. */
1.745 + hb_set_t copy;
1.746 + copy.init ();
1.747 + do {
1.748 + copy.set (glyphs);
1.749 + for (hb_codepoint_t lookup_index = -1; hb_set_next (&lookups, &lookup_index);)
1.750 + hb_ot_layout_lookup_substitute_closure (font->face, lookup_index, glyphs);
1.751 + } while (!copy.is_equal (glyphs));
1.752 +
1.753 + hb_shape_plan_destroy (shape_plan);
1.754 +}
