--- /dev/null 2015-11-17 15:40:19.000000000 -0800 +++ new/src/java.desktop/share/native/libfontmanager/harfbuzz/hb-ot-shape.cc 2015-11-17 15:40:19.000000000 -0800 @@ -0,0 +1,921 @@ +/* + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +// This file is available under and governed by the GNU General Public +// License version 2 only, as published by the Free Software Foundation. +// However, the following notice accompanied the original version of this +// file: +// +/* + * 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" + + +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; + + 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/behdad/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_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 + */ + +struct hb_ot_shaper_font_data_t {}; + +hb_ot_shaper_font_data_t * +_hb_ot_shaper_font_data_create (hb_font_t *font) +{ + 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) +{ + hb_ot_shape_plan_t *plan = (hb_ot_shape_plan_t *) calloc (1, sizeof (hb_ot_shape_plan_t)); + if (unlikely (!plan)) + return NULL; + + 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); + + if (plan->shaper->data_create) { + plan->data = plan->shaper->data_create (plan); + if (unlikely (!plan->data)) + return NULL; + } + + 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->finish (); + + 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 */ + 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->unicode); +} + +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->unicode); + + 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->next_glyph (); + + buffer->swap_buffers (); +} + +static void +hb_form_clusters (hb_buffer_t *buffer) +{ + if (buffer->cluster_level != HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES) + return; + + /* Loop duplicated in hb_ensure_native_direction(). */ + 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])))) + { + buffer->merge_clusters (base, i); + base = i; + } + } + buffer->merge_clusters (base, count); +} + +static void +hb_ensure_native_direction (hb_buffer_t *buffer) +{ + hb_direction_t direction = buffer->props.direction; + + /* 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 != hb_script_get_horizontal_direction (buffer->props.script)) || + (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->plan->has_frac) + return; + + hb_buffer_t *buffer = c->buffer; + + /* TODO look in pre/post context text also. */ + 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++; + + for (unsigned int j = start; j < i; j++) + info[j].mask |= c->plan->numr_mask | c->plan->frac_mask; + info[i].mask |= c->plan->frac_mask; + for (unsigned int j = i + 1; j < end; j++) + info[j].mask |= c->plan->frac_mask | c->plan->dnom_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->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]))) + 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->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 (c->font->get_glyph (' ', 0, &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 old_cluster = info[j - 1].cluster; + for (unsigned k = j; k && info[k - 1].cluster == old_cluster; k--) + info[k - 1].cluster = cluster; + } + 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_class_mask_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; + + if (c->plan->shaper->preprocess_text) + c->plan->shaper->preprocess_text (c->plan, buffer, c->font); + + hb_ot_shape_initialize_masks (c); + + 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 (!hb_ot_layout_has_positioning (c->face)) + _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_buffer_allocate_gsubgpos_vars (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); + + hb_ot_layout_substitute_finish (c->font, buffer); + + return; +} + +static inline void +hb_ot_substitute (hb_ot_shape_context_t *c) +{ + hb_ot_substitute_default (c); + 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_unicode (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_get_general_category (&info[i]) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) + { + if (adjust_offsets) + adjust_mark_offsets (&buffer->pos[i]); + zero_mark_width (&buffer->pos[i]); + } +} + +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; + for (unsigned int i = 0; i < count; i++) + { + c->font->get_glyph_advance_for_direction (info[i].codepoint, + direction, + &pos[i].x_advance, + &pos[i].y_advance); + c->font->subtract_glyph_origin_for_direction (info[i].codepoint, + direction, + &pos[i].x_offset, + &pos[i].y_offset); + + } +} + +static inline bool +hb_ot_position_complex (hb_ot_shape_context_t *c) +{ + bool ret = false; + unsigned int count = c->buffer->len; + bool has_positioning = hb_ot_layout_has_positioning (c->face); + /* 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 = !(has_positioning || c->plan->shaper->fallback_position || + HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction)); + + 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; + + /* Not currently used for any shaper: + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_EARLY: + zero_mark_widths_by_unicode (c->buffer, adjust_offsets_when_zeroing); + break; + */ + + default: + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE: + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_LATE: + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE: + break; + } + + if (has_positioning) + { + hb_glyph_info_t *info = c->buffer->info; + hb_glyph_position_t *pos = c->buffer->pos; + + /* Change glyph origin to what GPOS expects, apply GPOS, change it back. */ + + for (unsigned int i = 0; i < count; i++) { + c->font->add_glyph_origin_for_direction (info[i].codepoint, + HB_DIRECTION_LTR, + &pos[i].x_offset, + &pos[i].y_offset); + } + + c->plan->position (c->font, c->buffer); + + for (unsigned int i = 0; i < count; i++) { + c->font->subtract_glyph_origin_for_direction (info[i].codepoint, + HB_DIRECTION_LTR, + &pos[i].x_offset, + &pos[i].y_offset); + } + + ret = true; + } + + switch (c->plan->shaper->zero_width_marks) + { + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_LATE: + zero_mark_widths_by_unicode (c->buffer, adjust_offsets_when_zeroing); + break; + + 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_UNICODE_EARLY: + case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY: + break; + } + + return ret; +} + +static inline void +hb_ot_position (hb_ot_shape_context_t *c) +{ + hb_ot_layout_position_start (c->font, c->buffer); + + hb_ot_position_default (c); + + hb_bool_t fallback = !hb_ot_position_complex (c); + + hb_ot_zero_width_default_ignorables (c); + + hb_ot_layout_position_finish (c->font, c->buffer); + + if (fallback && 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 (fallback) + _hb_ot_shape_fallback_kern (c->plan, c->font, c->buffer); + + _hb_buffer_deallocate_gsubgpos_vars (c->buffer); +} + + +/* Pull it all together! */ + +static void +hb_ot_shape_internal (hb_ot_shape_context_t *c) +{ + c->buffer->deallocate_var_all (); + + /* 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_set_unicode_props (c->buffer); + hb_insert_dotted_circle (c->buffer, c->font); + hb_form_clusters (c->buffer); + + hb_ensure_native_direction (c->buffer); + + hb_ot_substitute (c); + hb_ot_position (c); + + hb_ot_hide_default_ignorables (c); + + _hb_buffer_deallocate_unicode_vars (c->buffer); + + c->buffer->props.direction = c->target_direction; + + 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; +} + + +/** + * 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_glyph (u, 0, &glyph)) + glyphs->add (glyph); + if (mirror) + { + hb_codepoint_t m = unicode->mirroring (u); + if (m != u && font->get_glyph (m, 0, &glyph)) + glyphs->add (glyph); + } +} + + +/** + * 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) +{ + hb_ot_shape_plan_t plan; + + const char *shapers[] = {"ot", NULL}; + 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; + lookups.init (); + hb_ot_shape_plan_collect_lookups (shape_plan, HB_OT_TAG_GSUB, &lookups); + + /* And find transitive closure. */ + hb_set_t copy; + copy.init (); + do { + copy.set (glyphs); + for (hb_codepoint_t lookup_index = -1; hb_set_next (&lookups, &lookup_index);) + hb_ot_layout_lookup_substitute_closure (font->face, lookup_index, glyphs); + } while (!copy.is_equal (glyphs)); + + hb_shape_plan_destroy (shape_plan); +}