/* * Copyright © 2009,2010 Red Hat, Inc. * Copyright © 2010,2011,2012 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Red Hat Author(s): Behdad Esfahbod * Google Author(s): Behdad Esfahbod */ #define HB_SHAPER ot #define hb_ot_shaper_face_data_t hb_ot_layout_t #define hb_ot_shaper_shape_plan_data_t hb_ot_shape_plan_t #include "hb-shaper-impl-private.hh" #include "hb-ot-shape-private.hh" #include "hb-ot-shape-complex-private.hh" #include "hb-ot-shape-fallback-private.hh" #include "hb-ot-shape-normalize-private.hh" #include "hb-ot-layout-private.hh" #include "hb-unicode-private.hh" #include "hb-set-private.hh" #include "hb-ot-layout-gsubgpos-private.hh" #include "hb-aat-layout-private.hh" static hb_tag_t common_features[] = { HB_TAG('c','c','m','p'), HB_TAG('l','o','c','l'), HB_TAG('m','a','r','k'), HB_TAG('m','k','m','k'), HB_TAG('r','l','i','g'), }; static hb_tag_t horizontal_features[] = { HB_TAG('c','a','l','t'), HB_TAG('c','l','i','g'), HB_TAG('c','u','r','s'), HB_TAG('k','e','r','n'), HB_TAG('l','i','g','a'), HB_TAG('r','c','l','t'), }; static void hb_ot_shape_collect_features (hb_ot_shape_planner_t *planner, const hb_segment_properties_t *props, const hb_feature_t *user_features, unsigned int num_user_features) { hb_ot_map_builder_t *map = &planner->map; map->add_global_bool_feature (HB_TAG('r','v','r','n')); map->add_gsub_pause (nullptr); switch (props->direction) { case HB_DIRECTION_LTR: map->add_global_bool_feature (HB_TAG ('l','t','r','a')); map->add_global_bool_feature (HB_TAG ('l','t','r','m')); break; case HB_DIRECTION_RTL: map->add_global_bool_feature (HB_TAG ('r','t','l','a')); map->add_feature (HB_TAG ('r','t','l','m'), 1, F_NONE); break; case HB_DIRECTION_TTB: case HB_DIRECTION_BTT: case HB_DIRECTION_INVALID: default: break; } map->add_feature (HB_TAG ('f','r','a','c'), 1, F_NONE); map->add_feature (HB_TAG ('n','u','m','r'), 1, F_NONE); map->add_feature (HB_TAG ('d','n','o','m'), 1, F_NONE); if (planner->shaper->collect_features) planner->shaper->collect_features (planner); for (unsigned int i = 0; i < ARRAY_LENGTH (common_features); i++) map->add_global_bool_feature (common_features[i]); if (HB_DIRECTION_IS_HORIZONTAL (props->direction)) for (unsigned int i = 0; i < ARRAY_LENGTH (horizontal_features); i++) map->add_feature (horizontal_features[i], 1, F_GLOBAL | (horizontal_features[i] == HB_TAG('k','e','r','n') ? F_HAS_FALLBACK : F_NONE)); else { /* We really want to find a 'vert' feature if there's any in the font, no * matter which script/langsys it is listed (or not) under. * See various bugs referenced from: * https://github.com/harfbuzz/harfbuzz/issues/63 */ map->add_feature (HB_TAG ('v','e','r','t'), 1, F_GLOBAL | F_GLOBAL_SEARCH); } if (planner->shaper->override_features) planner->shaper->override_features (planner); for (unsigned int i = 0; i < num_user_features; i++) { const hb_feature_t *feature = &user_features[i]; map->add_feature (feature->tag, feature->value, (feature->start == 0 && feature->end == (unsigned int) -1) ? F_GLOBAL : F_NONE); } } /* * shaper face data */ HB_SHAPER_DATA_ENSURE_DEFINE(ot, face) hb_ot_shaper_face_data_t * _hb_ot_shaper_face_data_create (hb_face_t *face) { return _hb_ot_layout_create (face); } void _hb_ot_shaper_face_data_destroy (hb_ot_shaper_face_data_t *data) { _hb_ot_layout_destroy (data); } /* * shaper font data */ HB_SHAPER_DATA_ENSURE_DEFINE(ot, font) struct hb_ot_shaper_font_data_t {}; hb_ot_shaper_font_data_t * _hb_ot_shaper_font_data_create (hb_font_t *font HB_UNUSED) { return (hb_ot_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED; } void _hb_ot_shaper_font_data_destroy (hb_ot_shaper_font_data_t *data) { } /* * shaper shape_plan data */ hb_ot_shaper_shape_plan_data_t * _hb_ot_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan, const hb_feature_t *user_features, unsigned int num_user_features, const int *coords, unsigned int num_coords) { hb_ot_shape_plan_t *plan = (hb_ot_shape_plan_t *) calloc (1, sizeof (hb_ot_shape_plan_t)); if (unlikely (!plan)) return nullptr; plan->init (); hb_ot_shape_planner_t planner (shape_plan); planner.shaper = hb_ot_shape_complex_categorize (&planner); hb_ot_shape_collect_features (&planner, &shape_plan->props, user_features, num_user_features); planner.compile (*plan, coords, num_coords); if (plan->shaper->data_create) { plan->data = plan->shaper->data_create (plan); if (unlikely (!plan->data)) return nullptr; } return plan; } void _hb_ot_shaper_shape_plan_data_destroy (hb_ot_shaper_shape_plan_data_t *plan) { if (plan->shaper->data_destroy) plan->shaper->data_destroy (const_cast (plan->data)); plan->fini (); free (plan); } /* * shaper */ struct hb_ot_shape_context_t { hb_ot_shape_plan_t *plan; hb_font_t *font; hb_face_t *face; hb_buffer_t *buffer; const hb_feature_t *user_features; unsigned int num_user_features; /* Transient stuff */ bool fallback_positioning; bool fallback_glyph_classes; hb_direction_t target_direction; }; /* Main shaper */ /* Prepare */ static void hb_set_unicode_props (hb_buffer_t *buffer) { unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 0; i < count; i++) _hb_glyph_info_set_unicode_props (&info[i], buffer); } static void hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font) { if (!(buffer->flags & HB_BUFFER_FLAG_BOT) || buffer->context_len[0] || _hb_glyph_info_get_general_category (&buffer->info[0]) != HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) return; if (!font->has_glyph (0x25CCu)) return; hb_glyph_info_t dottedcircle = {0}; dottedcircle.codepoint = 0x25CCu; _hb_glyph_info_set_unicode_props (&dottedcircle, buffer); buffer->clear_output (); buffer->idx = 0; hb_glyph_info_t info = dottedcircle; info.cluster = buffer->cur().cluster; info.mask = buffer->cur().mask; buffer->output_info (info); while (buffer->idx < buffer->len && buffer->successful) buffer->next_glyph (); buffer->swap_buffers (); } static void hb_form_clusters (hb_buffer_t *buffer) { if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII)) return; /* Loop duplicated in hb_ensure_native_direction(), and in _hb-coretext.cc */ unsigned int base = 0; unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 1; i < count; i++) { if (likely (!HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&info[i])) && !_hb_glyph_info_is_joiner (&info[i]))) { if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES) buffer->merge_clusters (base, i); else buffer->unsafe_to_break (base, i); base = i; } } if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES) buffer->merge_clusters (base, count); else buffer->unsafe_to_break (base, count); } static void hb_ensure_native_direction (hb_buffer_t *buffer) { hb_direction_t direction = buffer->props.direction; hb_direction_t horiz_dir = hb_script_get_horizontal_direction (buffer->props.script); /* TODO vertical: * The only BTT vertical script is Ogham, but it's not clear to me whether OpenType * Ogham fonts are supposed to be implemented BTT or not. Need to research that * first. */ if ((HB_DIRECTION_IS_HORIZONTAL (direction) && direction != horiz_dir && horiz_dir != HB_DIRECTION_INVALID) || (HB_DIRECTION_IS_VERTICAL (direction) && direction != HB_DIRECTION_TTB)) { /* Same loop as hb_form_clusters(). * Since form_clusters() merged clusters already, we don't merge. */ unsigned int base = 0; unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 1; i < count; i++) { if (likely (!HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&info[i])))) { if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS) buffer->merge_clusters (base, i); buffer->reverse_range (base, i); base = i; } } if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS) buffer->merge_clusters (base, count); buffer->reverse_range (base, count); buffer->reverse (); buffer->props.direction = HB_DIRECTION_REVERSE (buffer->props.direction); } } /* Substitute */ static inline void hb_ot_mirror_chars (hb_ot_shape_context_t *c) { if (HB_DIRECTION_IS_FORWARD (c->target_direction)) return; hb_buffer_t *buffer = c->buffer; hb_unicode_funcs_t *unicode = buffer->unicode; hb_mask_t rtlm_mask = c->plan->rtlm_mask; unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 0; i < count; i++) { hb_codepoint_t codepoint = unicode->mirroring (info[i].codepoint); if (likely (codepoint == info[i].codepoint || !c->font->has_glyph (codepoint))) info[i].mask |= rtlm_mask; else info[i].codepoint = codepoint; } } static inline void hb_ot_shape_setup_masks_fraction (hb_ot_shape_context_t *c) { if (!(c->buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII) || !c->plan->has_frac) return; hb_buffer_t *buffer = c->buffer; hb_mask_t pre_mask, post_mask; if (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) { pre_mask = c->plan->numr_mask | c->plan->frac_mask; post_mask = c->plan->frac_mask | c->plan->dnom_mask; } else { pre_mask = c->plan->frac_mask | c->plan->dnom_mask; post_mask = c->plan->numr_mask | c->plan->frac_mask; } unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 0; i < count; i++) { if (info[i].codepoint == 0x2044u) /* FRACTION SLASH */ { unsigned int start = i, end = i + 1; while (start && _hb_glyph_info_get_general_category (&info[start - 1]) == HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER) start--; while (end < count && _hb_glyph_info_get_general_category (&info[end]) == HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER) end++; buffer->unsafe_to_break (start, end); for (unsigned int j = start; j < i; j++) info[j].mask |= pre_mask; info[i].mask |= c->plan->frac_mask; for (unsigned int j = i + 1; j < end; j++) info[j].mask |= post_mask; i = end - 1; } } } static inline void hb_ot_shape_initialize_masks (hb_ot_shape_context_t *c) { hb_ot_map_t *map = &c->plan->map; hb_buffer_t *buffer = c->buffer; hb_mask_t global_mask = map->get_global_mask (); buffer->reset_masks (global_mask); } static inline void hb_ot_shape_setup_masks (hb_ot_shape_context_t *c) { hb_ot_map_t *map = &c->plan->map; hb_buffer_t *buffer = c->buffer; hb_ot_shape_setup_masks_fraction (c); if (c->plan->shaper->setup_masks) c->plan->shaper->setup_masks (c->plan, buffer, c->font); for (unsigned int i = 0; i < c->num_user_features; i++) { const hb_feature_t *feature = &c->user_features[i]; if (!(feature->start == 0 && feature->end == (unsigned int)-1)) { unsigned int shift; hb_mask_t mask = map->get_mask (feature->tag, &shift); buffer->set_masks (feature->value << shift, mask, feature->start, feature->end); } } } static void hb_ot_zero_width_default_ignorables (hb_ot_shape_context_t *c) { hb_buffer_t *buffer = c->buffer; if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES) || (buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES) || (buffer->flags & HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES)) return; unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; hb_glyph_position_t *pos = buffer->pos; unsigned int i = 0; for (i = 0; i < count; i++) if (unlikely (_hb_glyph_info_is_default_ignorable (&info[i]))) pos[i].x_advance = pos[i].y_advance = pos[i].x_offset = pos[i].y_offset = 0; } static void hb_ot_hide_default_ignorables (hb_ot_shape_context_t *c) { hb_buffer_t *buffer = c->buffer; if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES) || (buffer->flags & HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES)) return; unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; hb_glyph_position_t *pos = buffer->pos; unsigned int i = 0; for (i = 0; i < count; i++) { if (unlikely (_hb_glyph_info_is_default_ignorable (&info[i]))) break; } /* No default-ignorables found; return. */ if (i == count) return; hb_codepoint_t space; if (!(buffer->flags & HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES) && c->font->get_nominal_glyph (' ', &space)) { /* Replace default-ignorables with a zero-advance space glyph. */ for (/*continue*/; i < count; i++) { if (_hb_glyph_info_is_default_ignorable (&info[i])) info[i].codepoint = space; } } else { /* Merge clusters and delete default-ignorables. * NOTE! We can't use out-buffer as we have positioning data. */ unsigned int j = i; for (; i < count; i++) { if (_hb_glyph_info_is_default_ignorable (&info[i])) { /* Merge clusters. * Same logic as buffer->delete_glyph(), but for in-place removal. */ unsigned int cluster = info[i].cluster; if (i + 1 < count && cluster == info[i + 1].cluster) continue; /* Cluster survives; do nothing. */ if (j) { /* Merge cluster backward. */ if (cluster < info[j - 1].cluster) { unsigned int mask = info[i].mask; unsigned int old_cluster = info[j - 1].cluster; for (unsigned k = j; k && info[k - 1].cluster == old_cluster; k--) buffer->set_cluster (info[k - 1], cluster, mask); } continue; } if (i + 1 < count) buffer->merge_clusters (i, i + 2); /* Merge cluster forward. */ continue; } if (j != i) { info[j] = info[i]; pos[j] = pos[i]; } j++; } buffer->len = j; } } static inline void hb_ot_map_glyphs_fast (hb_buffer_t *buffer) { /* Normalization process sets up glyph_index(), we just copy it. */ unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 0; i < count; i++) info[i].codepoint = info[i].glyph_index(); buffer->content_type = HB_BUFFER_CONTENT_TYPE_GLYPHS; } static inline void hb_synthesize_glyph_classes (hb_ot_shape_context_t *c) { unsigned int count = c->buffer->len; hb_glyph_info_t *info = c->buffer->info; for (unsigned int i = 0; i < count; i++) { hb_ot_layout_glyph_props_flags_t klass; /* Never mark default-ignorables as marks. * They won't get in the way of lookups anyway, * but having them as mark will cause them to be skipped * over if the lookup-flag says so, but at least for the * Mongolian variation selectors, looks like Uniscribe * marks them as non-mark. Some Mongolian fonts without * GDEF rely on this. Another notable character that * this applies to is COMBINING GRAPHEME JOINER. */ klass = (_hb_glyph_info_get_general_category (&info[i]) != HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK || _hb_glyph_info_is_default_ignorable (&info[i])) ? HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH : HB_OT_LAYOUT_GLYPH_PROPS_MARK; _hb_glyph_info_set_glyph_props (&info[i], klass); } } static inline void hb_ot_substitute_default (hb_ot_shape_context_t *c) { hb_buffer_t *buffer = c->buffer; hb_ot_mirror_chars (c); HB_BUFFER_ALLOCATE_VAR (buffer, glyph_index); _hb_ot_shape_normalize (c->plan, buffer, c->font); hb_ot_shape_setup_masks (c); /* This is unfortunate to go here, but necessary... */ if (c->fallback_positioning) _hb_ot_shape_fallback_position_recategorize_marks (c->plan, c->font, buffer); hb_ot_map_glyphs_fast (buffer); HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_index); } static inline void hb_ot_substitute_complex (hb_ot_shape_context_t *c) { hb_buffer_t *buffer = c->buffer; hb_ot_layout_substitute_start (c->font, buffer); if (!hb_ot_layout_has_glyph_classes (c->face)) hb_synthesize_glyph_classes (c); c->plan->substitute (c->font, buffer); if (0) /* XXX Call morx instead. */ hb_aat_layout_substitute (c->font, c->buffer); } static inline void hb_ot_substitute (hb_ot_shape_context_t *c) { hb_ot_substitute_default (c); _hb_buffer_allocate_gsubgpos_vars (c->buffer); hb_ot_substitute_complex (c); } /* Position */ static inline void adjust_mark_offsets (hb_glyph_position_t *pos) { pos->x_offset -= pos->x_advance; pos->y_offset -= pos->y_advance; } static inline void zero_mark_width (hb_glyph_position_t *pos) { pos->x_advance = 0; pos->y_advance = 0; } static inline void zero_mark_widths_by_gdef (hb_buffer_t *buffer, bool adjust_offsets) { unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 0; i < count; i++) if (_hb_glyph_info_is_mark (&info[i])) { if (adjust_offsets) adjust_mark_offsets (&buffer->pos[i]); zero_mark_width (&buffer->pos[i]); } } static inline void hb_ot_position_default (hb_ot_shape_context_t *c) { hb_direction_t direction = c->buffer->props.direction; unsigned int count = c->buffer->len; hb_glyph_info_t *info = c->buffer->info; hb_glyph_position_t *pos = c->buffer->pos; if (HB_DIRECTION_IS_HORIZONTAL (direction)) { for (unsigned int i = 0; i < count; i++) pos[i].x_advance = c->font->get_glyph_h_advance (info[i].codepoint); /* The nil glyph_h_origin() func returns 0, so no need to apply it. */ if (c->font->has_glyph_h_origin_func ()) for (unsigned int i = 0; i < count; i++) c->font->subtract_glyph_h_origin (info[i].codepoint, &pos[i].x_offset, &pos[i].y_offset); } else { for (unsigned int i = 0; i < count; i++) { pos[i].y_advance = c->font->get_glyph_v_advance (info[i].codepoint); c->font->subtract_glyph_v_origin (info[i].codepoint, &pos[i].x_offset, &pos[i].y_offset); } } if (c->buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK) _hb_ot_shape_fallback_spaces (c->plan, c->font, c->buffer); } static inline void hb_ot_position_complex (hb_ot_shape_context_t *c) { unsigned int count = c->buffer->len; hb_glyph_info_t *info = c->buffer->info; hb_glyph_position_t *pos = c->buffer->pos; /* If the font has no GPOS, AND, no fallback positioning will * happen, AND, direction is forward, then when zeroing mark * widths, we shift the mark with it, such that the mark * is positioned hanging over the previous glyph. When * direction is backward we don't shift and it will end up * hanging over the next glyph after the final reordering. * If fallback positinoing happens or GPOS is present, we don't * care. */ bool adjust_offsets_when_zeroing = c->fallback_positioning && !c->plan->shaper->fallback_position && HB_DIRECTION_IS_FORWARD (c->buffer->props.direction); /* We change glyph origin to what GPOS expects (horizontal), apply GPOS, change it back. */ /* The nil glyph_h_origin() func returns 0, so no need to apply it. */ if (c->font->has_glyph_h_origin_func ()) for (unsigned int i = 0; i < count; i++) c->font->add_glyph_h_origin (info[i].codepoint, &pos[i].x_offset, &pos[i].y_offset); hb_ot_layout_position_start (c->font, c->buffer); switch (c->plan->shaper->zero_width_marks) { case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY: zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing); break; default: case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE: case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE: break; } if (likely (!c->fallback_positioning)) c->plan->position (c->font, c->buffer); switch (c->plan->shaper->zero_width_marks) { case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE: zero_mark_widths_by_gdef (c->buffer, adjust_offsets_when_zeroing); break; default: case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE: case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY: break; } /* Finishing off GPOS has to follow a certain order. */ hb_ot_layout_position_finish_advances (c->font, c->buffer); hb_ot_zero_width_default_ignorables (c); hb_ot_layout_position_finish_offsets (c->font, c->buffer); /* The nil glyph_h_origin() func returns 0, so no need to apply it. */ if (c->font->has_glyph_h_origin_func ()) for (unsigned int i = 0; i < count; i++) c->font->subtract_glyph_h_origin (info[i].codepoint, &pos[i].x_offset, &pos[i].y_offset); } static inline void hb_ot_position (hb_ot_shape_context_t *c) { c->buffer->clear_positions (); hb_ot_position_default (c); hb_ot_position_complex (c); if (c->fallback_positioning && c->plan->shaper->fallback_position) _hb_ot_shape_fallback_position (c->plan, c->font, c->buffer); if (HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction)) hb_buffer_reverse (c->buffer); /* Visual fallback goes here. */ if (c->fallback_positioning) _hb_ot_shape_fallback_kern (c->plan, c->font, c->buffer); _hb_buffer_deallocate_gsubgpos_vars (c->buffer); //hb_aat_layout_position (c->font, c->buffer); } static inline void hb_propagate_flags (hb_buffer_t *buffer) { /* Propagate cluster-level glyph flags to be the same on all cluster glyphs. * Simplifies using them. */ if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_UNSAFE_TO_BREAK)) return; hb_glyph_info_t *info = buffer->info; foreach_cluster (buffer, start, end) { unsigned int mask = 0; for (unsigned int i = start; i < end; i++) if (info[i].mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK) { mask = HB_GLYPH_FLAG_UNSAFE_TO_BREAK; break; } if (mask) for (unsigned int i = start; i < end; i++) info[i].mask |= mask; } } /* Pull it all together! */ static void hb_ot_shape_internal (hb_ot_shape_context_t *c) { c->buffer->deallocate_var_all (); c->buffer->scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT; if (likely (!hb_unsigned_mul_overflows (c->buffer->len, HB_BUFFER_MAX_LEN_FACTOR))) { c->buffer->max_len = MAX (c->buffer->len * HB_BUFFER_MAX_LEN_FACTOR, (unsigned) HB_BUFFER_MAX_LEN_MIN); } if (likely (!hb_unsigned_mul_overflows (c->buffer->len, HB_BUFFER_MAX_OPS_FACTOR))) { c->buffer->max_ops = MAX (c->buffer->len * HB_BUFFER_MAX_OPS_FACTOR, (unsigned) HB_BUFFER_MAX_OPS_MIN); } bool disable_otl = c->plan->shaper->disable_otl && c->plan->shaper->disable_otl (c->plan); //c->fallback_substitute = disable_otl || !hb_ot_layout_has_substitution (c->face); c->fallback_positioning = disable_otl || !hb_ot_layout_has_positioning (c->face); c->fallback_glyph_classes = disable_otl || !hb_ot_layout_has_glyph_classes (c->face); /* Save the original direction, we use it later. */ c->target_direction = c->buffer->props.direction; _hb_buffer_allocate_unicode_vars (c->buffer); c->buffer->clear_output (); hb_ot_shape_initialize_masks (c); hb_set_unicode_props (c->buffer); hb_insert_dotted_circle (c->buffer, c->font); hb_form_clusters (c->buffer); hb_ensure_native_direction (c->buffer); if (c->plan->shaper->preprocess_text) c->plan->shaper->preprocess_text (c->plan, c->buffer, c->font); hb_ot_substitute (c); hb_ot_position (c); hb_ot_hide_default_ignorables (c); if (c->plan->shaper->postprocess_glyphs) c->plan->shaper->postprocess_glyphs (c->plan, c->buffer, c->font); hb_propagate_flags (c->buffer); _hb_buffer_deallocate_unicode_vars (c->buffer); c->buffer->props.direction = c->target_direction; c->buffer->max_len = HB_BUFFER_MAX_LEN_DEFAULT; c->buffer->max_ops = HB_BUFFER_MAX_OPS_DEFAULT; c->buffer->deallocate_var_all (); } hb_bool_t _hb_ot_shape (hb_shape_plan_t *shape_plan, hb_font_t *font, hb_buffer_t *buffer, const hb_feature_t *features, unsigned int num_features) { hb_ot_shape_context_t c = {HB_SHAPER_DATA_GET (shape_plan), font, font->face, buffer, features, num_features}; hb_ot_shape_internal (&c); return true; } /** * hb_ot_shape_plan_collect_lookups: * * Since: 0.9.7 **/ void hb_ot_shape_plan_collect_lookups (hb_shape_plan_t *shape_plan, hb_tag_t table_tag, hb_set_t *lookup_indexes /* OUT */) { /* XXX Does the first part always succeed? */ HB_SHAPER_DATA_GET (shape_plan)->collect_lookups (table_tag, lookup_indexes); } /* TODO Move this to hb-ot-shape-normalize, make it do decompose, and make it public. */ static void add_char (hb_font_t *font, hb_unicode_funcs_t *unicode, hb_bool_t mirror, hb_codepoint_t u, hb_set_t *glyphs) { hb_codepoint_t glyph; if (font->get_nominal_glyph (u, &glyph)) glyphs->add (glyph); if (mirror) { hb_codepoint_t m = unicode->mirroring (u); if (m != u && font->get_nominal_glyph (m, &glyph)) glyphs->add (glyph); } } /** * hb_ot_shape_glyphs_closure: * * Since: 0.9.2 **/ void hb_ot_shape_glyphs_closure (hb_font_t *font, hb_buffer_t *buffer, const hb_feature_t *features, unsigned int num_features, hb_set_t *glyphs) { const char *shapers[] = {"ot", nullptr}; hb_shape_plan_t *shape_plan = hb_shape_plan_create_cached (font->face, &buffer->props, features, num_features, shapers); bool mirror = hb_script_get_horizontal_direction (buffer->props.script) == HB_DIRECTION_RTL; unsigned int count = buffer->len; hb_glyph_info_t *info = buffer->info; for (unsigned int i = 0; i < count; i++) add_char (font, buffer->unicode, mirror, info[i].codepoint, glyphs); hb_set_t *lookups = hb_set_create (); hb_ot_shape_plan_collect_lookups (shape_plan, HB_OT_TAG_GSUB, lookups); hb_ot_layout_lookups_substitute_closure (font->face, lookups, glyphs); hb_set_destroy (lookups); hb_shape_plan_destroy (shape_plan); }