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-/*
- * Copyright © 2009,2010 Red Hat, Inc.
- * Copyright © 2010,2011,2012,2013 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
- */
-
-#ifndef HB_OT_MAP_PRIVATE_HH
-#define HB_OT_MAP_PRIVATE_HH
-
-#include "hb-buffer-private.hh"
-
-
-struct hb_ot_shape_plan_t;
-
-static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};
-
-struct hb_ot_map_t
-{
- friend struct hb_ot_map_builder_t;
-
- public:
-
- struct feature_map_t {
- hb_tag_t tag; /* should be first for our bsearch to work */
- unsigned int index[2]; /* GSUB/GPOS */
- unsigned int stage[2]; /* GSUB/GPOS */
- unsigned int shift;
- hb_mask_t mask;
- hb_mask_t _1_mask; /* mask for value=1, for quick access */
- unsigned int needs_fallback : 1;
- unsigned int auto_zwnj : 1;
- unsigned int auto_zwj : 1;
-
- inline int cmp (const hb_tag_t *tag_) const
- { return *tag_ < tag ? -1 : *tag_ > tag ? 1 : 0; }
- };
-
- struct lookup_map_t {
- unsigned short index;
- unsigned short auto_zwnj : 1;
- unsigned short auto_zwj : 1;
- hb_mask_t mask;
-
- static int cmp (const void *pa, const void *pb)
- {
- const lookup_map_t *a = (const lookup_map_t *) pa;
- const lookup_map_t *b = (const lookup_map_t *) pb;
- return a->index < b->index ? -1 : a->index > b->index ? 1 : 0;
- }
- };
-
- typedef void (*pause_func_t) (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer);
-
- struct stage_map_t {
- unsigned int last_lookup; /* Cumulative */
- pause_func_t pause_func;
- };
-
-
- hb_ot_map_t (void) { memset (this, 0, sizeof (*this)); }
-
- inline hb_mask_t get_global_mask (void) const { return global_mask; }
-
- inline hb_mask_t get_mask (hb_tag_t feature_tag, unsigned int *shift = nullptr) const {
- const feature_map_t *map = features.bsearch (&feature_tag);
- if (shift) *shift = map ? map->shift : 0;
- return map ? map->mask : 0;
- }
-
- inline bool needs_fallback (hb_tag_t feature_tag) const {
- const feature_map_t *map = features.bsearch (&feature_tag);
- return map ? map->needs_fallback : false;
- }
-
- inline hb_mask_t get_1_mask (hb_tag_t feature_tag) const {
- const feature_map_t *map = features.bsearch (&feature_tag);
- return map ? map->_1_mask : 0;
- }
-
- inline unsigned int get_feature_index (unsigned int table_index, hb_tag_t feature_tag) const {
- const feature_map_t *map = features.bsearch (&feature_tag);
- return map ? map->index[table_index] : HB_OT_LAYOUT_NO_FEATURE_INDEX;
- }
-
- inline unsigned int get_feature_stage (unsigned int table_index, hb_tag_t feature_tag) const {
- const feature_map_t *map = features.bsearch (&feature_tag);
- return map ? map->stage[table_index] : (unsigned int) -1;
- }
-
- inline void get_stage_lookups (unsigned int table_index, unsigned int stage,
- const struct lookup_map_t **plookups, unsigned int *lookup_count) const {
- if (unlikely (stage == (unsigned int) -1)) {
- *plookups = nullptr;
- *lookup_count = 0;
- return;
- }
- assert (stage <= stages[table_index].len);
- unsigned int start = stage ? stages[table_index][stage - 1].last_lookup : 0;
- unsigned int end = stage < stages[table_index].len ? stages[table_index][stage].last_lookup : lookups[table_index].len;
- *plookups = end == start ? nullptr : &lookups[table_index][start];
- *lookup_count = end - start;
- }
-
- HB_INTERNAL void collect_lookups (unsigned int table_index, hb_set_t *lookups) const;
- template <typename Proxy>
- HB_INTERNAL inline void apply (const Proxy &proxy,
- const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
- HB_INTERNAL void substitute (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
- HB_INTERNAL void position (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
-
- inline void finish (void) {
- features.finish ();
- for (unsigned int table_index = 0; table_index < 2; table_index++)
- {
- lookups[table_index].finish ();
- stages[table_index].finish ();
- }
- }
-
- public:
- hb_tag_t chosen_script[2];
- bool found_script[2];
-
- private:
-
- hb_mask_t global_mask;
-
- hb_prealloced_array_t<feature_map_t, 8> features;
- hb_prealloced_array_t<lookup_map_t, 32> lookups[2]; /* GSUB/GPOS */
- hb_prealloced_array_t<stage_map_t, 4> stages[2]; /* GSUB/GPOS */
-};
-
-enum hb_ot_map_feature_flags_t {
- F_NONE = 0x0000u,
- F_GLOBAL = 0x0001u, /* Feature applies to all characters; results in no mask allocated for it. */
- F_HAS_FALLBACK = 0x0002u, /* Has fallback implementation, so include mask bit even if feature not found. */
- F_MANUAL_ZWNJ = 0x0004u, /* Don't skip over ZWNJ when matching **context**. */
- F_MANUAL_ZWJ = 0x0008u, /* Don't skip over ZWJ when matching **input**. */
- F_GLOBAL_SEARCH = 0x0010u /* If feature not found in LangSys, look for it in global feature list and pick one. */
-};
-HB_MARK_AS_FLAG_T (hb_ot_map_feature_flags_t);
-/* Macro version for where const is desired. */
-#define F_COMBINE(l,r) (hb_ot_map_feature_flags_t ((unsigned int) (l) | (unsigned int) (r)))
-
-
-struct hb_ot_map_builder_t
-{
- public:
-
- HB_INTERNAL hb_ot_map_builder_t (hb_face_t *face_,
- const hb_segment_properties_t *props_);
-
- HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value,
- hb_ot_map_feature_flags_t flags);
-
- inline void add_global_bool_feature (hb_tag_t tag)
- { add_feature (tag, 1, F_GLOBAL); }
-
- inline void add_gsub_pause (hb_ot_map_t::pause_func_t pause_func)
- { add_pause (0, pause_func); }
- inline void add_gpos_pause (hb_ot_map_t::pause_func_t pause_func)
- { add_pause (1, pause_func); }
-
- HB_INTERNAL void compile (hb_ot_map_t &m,
- const int *coords,
- unsigned int num_coords);
-
- inline void finish (void) {
- feature_infos.finish ();
- for (unsigned int table_index = 0; table_index < 2; table_index++)
- {
- stages[table_index].finish ();
- }
- }
-
- private:
-
- HB_INTERNAL void add_lookups (hb_ot_map_t &m,
- hb_face_t *face,
- unsigned int table_index,
- unsigned int feature_index,
- unsigned int variations_index,
- hb_mask_t mask,
- bool auto_zwnj = true,
- bool auto_zwj = true);
-
- struct feature_info_t {
- hb_tag_t tag;
- unsigned int seq; /* sequence#, used for stable sorting only */
- unsigned int max_value;
- hb_ot_map_feature_flags_t flags;
- unsigned int default_value; /* for non-global features, what should the unset glyphs take */
- unsigned int stage[2]; /* GSUB/GPOS */
-
- static int cmp (const void *pa, const void *pb)
- {
- const feature_info_t *a = (const feature_info_t *) pa;
- const feature_info_t *b = (const feature_info_t *) pb;
- return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) :
- (a->seq < b->seq ? -1 : a->seq > b->seq ? 1 : 0);
- }
- };
-
- struct stage_info_t {
- unsigned int index;
- hb_ot_map_t::pause_func_t pause_func;
- };
-
- HB_INTERNAL void add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func);
-
- public:
-
- hb_face_t *face;
- hb_segment_properties_t props;
-
- hb_tag_t chosen_script[2];
- bool found_script[2];
- unsigned int script_index[2], language_index[2];
-
- private:
-
- unsigned int current_stage[2]; /* GSUB/GPOS */
- hb_prealloced_array_t<feature_info_t, 32> feature_infos;
- hb_prealloced_array_t<stage_info_t, 8> stages[2]; /* GSUB/GPOS */
-};
-
-
-
-#endif /* HB_OT_MAP_PRIVATE_HH */
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