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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 */
+ hb_bool_t needs_fallback;
+
+ 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 int index;
+ 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);
+
+ 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 */
+};
+
+
+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, bool global, bool has_fallback = false);
+
+ inline void add_bool_feature (hb_tag_t tag, bool global = true, bool has_fallback = false)
+ { add_feature (tag, 1, global, has_fallback); }
+
+ 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;
+ bool global; /* whether the feature applies value to every glyph in the buffer */
+ bool has_fallback; /* whether to allocate bits even if feature not found */
+ 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 */