291 lines
9.1 KiB
C++
291 lines
9.1 KiB
C++
/*
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* Copyright © 2009,2010 Red Hat, Inc.
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* Copyright © 2010,2011,2012,2013 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_MAP_HH
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#define HB_OT_MAP_HH
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#include "hb-buffer.hh"
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#define HB_OT_MAP_MAX_BITS 8u
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#define HB_OT_MAP_MAX_VALUE ((1u << HB_OT_MAP_MAX_BITS) - 1u)
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struct hb_ot_shape_plan_t;
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static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};
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struct hb_ot_map_t
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{
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friend struct hb_ot_map_builder_t;
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public:
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struct feature_map_t {
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hb_tag_t tag; /* should be first for our bsearch to work */
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unsigned int index[2]; /* GSUB/GPOS */
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unsigned int stage[2]; /* GSUB/GPOS */
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unsigned int shift;
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hb_mask_t mask;
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hb_mask_t _1_mask; /* mask for value=1, for quick access */
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unsigned int needs_fallback : 1;
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unsigned int auto_zwnj : 1;
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unsigned int auto_zwj : 1;
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unsigned int random : 1;
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unsigned int per_syllable : 1;
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int cmp (const hb_tag_t tag_) const
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{ return tag_ < tag ? -1 : tag_ > tag ? 1 : 0; }
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};
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struct lookup_map_t {
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unsigned short index;
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unsigned short auto_zwnj : 1;
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unsigned short auto_zwj : 1;
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unsigned short random : 1;
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unsigned short per_syllable : 1;
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hb_mask_t mask;
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hb_tag_t feature_tag;
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HB_INTERNAL static int cmp (const void *pa, const void *pb)
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{
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const lookup_map_t *a = (const lookup_map_t *) pa;
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const lookup_map_t *b = (const lookup_map_t *) pb;
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return a->index < b->index ? -1 : a->index > b->index ? 1 : 0;
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}
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};
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/* Pause functions return true if new glyph indices might have been
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* added to the buffer. This is used to update buffer digest. */
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typedef bool (*pause_func_t) (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer);
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struct stage_map_t {
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unsigned int last_lookup; /* Cumulative */
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pause_func_t pause_func;
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};
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void init ()
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{
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hb_memset (this, 0, sizeof (*this));
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features.init0 ();
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for (unsigned int table_index = 0; table_index < 2; table_index++)
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{
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lookups[table_index].init0 ();
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stages[table_index].init0 ();
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}
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}
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void fini ()
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{
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features.fini ();
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for (unsigned int table_index = 0; table_index < 2; table_index++)
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{
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lookups[table_index].fini ();
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stages[table_index].fini ();
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}
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}
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hb_mask_t get_global_mask () const { return global_mask; }
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hb_mask_t get_mask (hb_tag_t feature_tag, unsigned int *shift = nullptr) const
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{
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const feature_map_t *map = features.bsearch (feature_tag);
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if (shift) *shift = map ? map->shift : 0;
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return map ? map->mask : 0;
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}
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bool needs_fallback (hb_tag_t feature_tag) const
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{
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const feature_map_t *map = features.bsearch (feature_tag);
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return map ? map->needs_fallback : false;
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}
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hb_mask_t get_1_mask (hb_tag_t feature_tag) const
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{
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const feature_map_t *map = features.bsearch (feature_tag);
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return map ? map->_1_mask : 0;
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}
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unsigned int get_feature_index (unsigned int table_index, hb_tag_t feature_tag) const
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{
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const feature_map_t *map = features.bsearch (feature_tag);
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return map ? map->index[table_index] : HB_OT_LAYOUT_NO_FEATURE_INDEX;
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}
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unsigned int get_feature_stage (unsigned int table_index, hb_tag_t feature_tag) const
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{
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const feature_map_t *map = features.bsearch (feature_tag);
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return map ? map->stage[table_index] : UINT_MAX;
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}
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hb_array_t<const hb_ot_map_t::lookup_map_t>
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get_stage_lookups (unsigned int table_index, unsigned int stage) const
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{
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if (unlikely (stage > stages[table_index].length))
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return hb_array<const hb_ot_map_t::lookup_map_t> (nullptr, 0);
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unsigned int start = stage ? stages[table_index][stage - 1].last_lookup : 0;
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unsigned int end = stage < stages[table_index].length ? stages[table_index][stage].last_lookup : lookups[table_index].length;
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return lookups[table_index].as_array ().sub_array (start, end - start);
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}
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HB_INTERNAL void collect_lookups (unsigned int table_index, hb_set_t *lookups) const;
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template <typename Proxy>
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HB_INTERNAL void apply (const Proxy &proxy,
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const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
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HB_INTERNAL void substitute (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
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HB_INTERNAL void position (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const;
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public:
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hb_tag_t chosen_script[2];
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bool found_script[2];
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private:
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hb_mask_t global_mask = 0;
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hb_sorted_vector_t<feature_map_t> features;
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hb_vector_t<lookup_map_t> lookups[2]; /* GSUB/GPOS */
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hb_vector_t<stage_map_t> stages[2]; /* GSUB/GPOS */
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};
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enum hb_ot_map_feature_flags_t
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{
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F_NONE = 0x0000u,
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F_GLOBAL = 0x0001u, /* Feature applies to all characters; results in no mask allocated for it. */
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F_HAS_FALLBACK = 0x0002u, /* Has fallback implementation, so include mask bit even if feature not found. */
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F_MANUAL_ZWNJ = 0x0004u, /* Don't skip over ZWNJ when matching **context**. */
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F_MANUAL_ZWJ = 0x0008u, /* Don't skip over ZWJ when matching **input**. */
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F_MANUAL_JOINERS = F_MANUAL_ZWNJ | F_MANUAL_ZWJ,
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F_GLOBAL_MANUAL_JOINERS= F_GLOBAL | F_MANUAL_JOINERS,
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F_GLOBAL_HAS_FALLBACK = F_GLOBAL | F_HAS_FALLBACK,
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F_GLOBAL_SEARCH = 0x0010u, /* If feature not found in LangSys, look for it in global feature list and pick one. */
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F_RANDOM = 0x0020u, /* Randomly select a glyph from an AlternateSubstFormat1 subtable. */
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F_PER_SYLLABLE = 0x0040u /* Contain lookup application to within syllable. */
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};
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HB_MARK_AS_FLAG_T (hb_ot_map_feature_flags_t);
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struct hb_ot_map_feature_t
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{
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hb_tag_t tag;
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hb_ot_map_feature_flags_t flags;
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};
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struct hb_ot_shape_plan_key_t;
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struct hb_ot_map_builder_t
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{
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public:
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HB_INTERNAL hb_ot_map_builder_t (hb_face_t *face_,
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const hb_segment_properties_t &props_);
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HB_INTERNAL ~hb_ot_map_builder_t ();
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HB_INTERNAL void add_feature (hb_tag_t tag,
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hb_ot_map_feature_flags_t flags=F_NONE,
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unsigned int value=1);
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HB_INTERNAL bool has_feature (hb_tag_t tag);
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void add_feature (const hb_ot_map_feature_t &feat)
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{ add_feature (feat.tag, feat.flags); }
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void enable_feature (hb_tag_t tag,
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hb_ot_map_feature_flags_t flags=F_NONE,
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unsigned int value=1)
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{ add_feature (tag, F_GLOBAL | flags, value); }
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void disable_feature (hb_tag_t tag)
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{ add_feature (tag, F_GLOBAL, 0); }
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void add_gsub_pause (hb_ot_map_t::pause_func_t pause_func)
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{ add_pause (0, pause_func); }
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void add_gpos_pause (hb_ot_map_t::pause_func_t pause_func)
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{ add_pause (1, pause_func); }
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HB_INTERNAL void compile (hb_ot_map_t &m,
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const hb_ot_shape_plan_key_t &key);
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private:
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HB_INTERNAL void add_lookups (hb_ot_map_t &m,
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unsigned int table_index,
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unsigned int feature_index,
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unsigned int variations_index,
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hb_mask_t mask,
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bool auto_zwnj = true,
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bool auto_zwj = true,
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bool random = false,
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bool per_syllable = false,
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hb_tag_t feature_tag = HB_TAG(' ',' ',' ',' '));
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struct feature_info_t {
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hb_tag_t tag;
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unsigned int seq; /* sequence#, used for stable sorting only */
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unsigned int max_value;
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hb_ot_map_feature_flags_t flags;
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unsigned int default_value; /* for non-global features, what should the unset glyphs take */
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unsigned int stage[2]; /* GSUB/GPOS */
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HB_INTERNAL static int cmp (const void *pa, const void *pb)
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{
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const feature_info_t *a = (const feature_info_t *) pa;
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const feature_info_t *b = (const feature_info_t *) pb;
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return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) :
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(a->seq < b->seq ? -1 : a->seq > b->seq ? 1 : 0);
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}
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};
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struct stage_info_t {
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unsigned int index;
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hb_ot_map_t::pause_func_t pause_func;
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};
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HB_INTERNAL void add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func);
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public:
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hb_face_t *face;
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hb_segment_properties_t props;
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hb_tag_t chosen_script[2];
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bool found_script[2];
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unsigned int script_index[2], language_index[2];
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private:
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unsigned int current_stage[2]; /* GSUB/GPOS */
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hb_vector_t<feature_info_t> feature_infos;
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hb_vector_t<stage_info_t> stages[2]; /* GSUB/GPOS */
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};
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#endif /* HB_OT_MAP_HH */
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