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-/*
- * 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
- */
-
-#ifndef HB_OT_MAP_PRIVATE_HH
-#define HB_OT_MAP_PRIVATE_HH
-
-#include "hb-buffer-private.hh"
-
-#include "hb-ot-layout-private.hh"
-
-
-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_zwj : 1;
-
- static int cmp (const feature_map_t *a, const feature_map_t *b)
- { return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; }
- };
-
- struct lookup_map_t {
- unsigned short index;
- unsigned short auto_zwj : 1;
- hb_mask_t mask;
-
- static int cmp (const lookup_map_t *a, const lookup_map_t *b)
- { 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 pause_map_t {
- unsigned int num_lookups; /* Cumulative */
- pause_func_t callback;
- };
-
-
- 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 = NULL) 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 = NULL;
- *lookup_count = 0;
- return;
- }
- assert (stage <= pauses[table_index].len);
- unsigned int start = stage ? pauses[table_index][stage - 1].num_lookups : 0;
- unsigned int end = stage < pauses[table_index].len ? pauses[table_index][stage].num_lookups : lookups[table_index].len;
- *plookups = &lookups[table_index][start];
- *lookup_count = end - start;
- }
-
- HB_INTERNAL void collect_lookups (unsigned int table_index, hb_set_t *lookups) 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 ();
- lookups[0].finish ();
- lookups[1].finish ();
- pauses[0].finish ();
- pauses[1].finish ();
- }
-
- public:
- hb_tag_t chosen_script[2];
- bool found_script[2];
-
- private:
-
- HB_INTERNAL void add_lookups (hb_face_t *face,
- unsigned int table_index,
- unsigned int feature_index,
- hb_mask_t mask,
- bool auto_zwj);
-
- 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<pause_map_t, 1> pauses[2]; /* GSUB/GPOS */
-};
-
-enum hb_ot_map_feature_flags_t {
- F_NONE = 0x0000,
- F_GLOBAL = 0x0001,
- F_HAS_FALLBACK = 0x0002,
- F_MANUAL_ZWJ = 0x0004
-};
-/* Macro version for where const is desired. */
-#define F_COMBINE(l,r) (hb_ot_map_feature_flags_t ((unsigned int) (l) | (unsigned int) (r)))
-inline hb_ot_map_feature_flags_t
-operator | (hb_ot_map_feature_flags_t l, hb_ot_map_feature_flags_t r)
-{ return hb_ot_map_feature_flags_t ((unsigned int) l | (unsigned int) r); }
-inline hb_ot_map_feature_flags_t
-operator & (hb_ot_map_feature_flags_t l, hb_ot_map_feature_flags_t r)
-{ return hb_ot_map_feature_flags_t ((unsigned int) l & (unsigned int) r); }
-inline hb_ot_map_feature_flags_t
-operator ~ (hb_ot_map_feature_flags_t r)
-{ return hb_ot_map_feature_flags_t (~(unsigned int) r); }
-inline hb_ot_map_feature_flags_t&
-operator |= (hb_ot_map_feature_flags_t &l, hb_ot_map_feature_flags_t r)
-{ l = l | r; return l; }
-inline hb_ot_map_feature_flags_t&
-operator &= (hb_ot_map_feature_flags_t& l, hb_ot_map_feature_flags_t r)
-{ l = l & r; return l; }
-
-
-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 (struct hb_ot_map_t &m);
-
- inline void finish (void) {
- feature_infos.finish ();
- pauses[0].finish ();
- pauses[1].finish ();
- }
-
- private:
-
- 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 feature_info_t *a, const feature_info_t *b)
- { return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); }
- };
-
- struct pause_info_t {
- unsigned int stage;
- hb_ot_map_t::pause_func_t callback;
- };
-
- 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,16> feature_infos;
- hb_prealloced_array_t<pause_info_t, 1> pauses[2]; /* GSUB/GPOS */
-};
-
-
-
-#endif /* HB_OT_MAP_PRIVATE_HH */