/* * Copyright © 2007,2008,2009 Red Hat, Inc. * Copyright © 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_LAYOUT_HH #define HB_OT_LAYOUT_HH #include "hb.hh" #include "hb-font.hh" #include "hb-buffer.hh" #include "hb-open-type.hh" #include "hb-ot-shape.hh" #include "hb-set-digest.hh" struct hb_ot_shape_plan_t; /* * kern */ HB_INTERNAL bool hb_ot_layout_has_kerning (hb_face_t *face); HB_INTERNAL bool hb_ot_layout_has_machine_kerning (hb_face_t *face); HB_INTERNAL bool hb_ot_layout_has_cross_kerning (hb_face_t *face); HB_INTERNAL void hb_ot_layout_kern (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer); /* Private API corresponding to hb-ot-layout.h: */ HB_INTERNAL bool hb_ot_layout_table_find_feature (hb_face_t *face, hb_tag_t table_tag, hb_tag_t feature_tag, unsigned int *feature_index); /* * GDEF */ enum hb_ot_layout_glyph_props_flags_t { … }; HB_MARK_AS_FLAG_T (hb_ot_layout_glyph_props_flags_t); /* * GSUB/GPOS */ /* Should be called before all the substitute_lookup's are done. */ HB_INTERNAL void hb_ot_layout_substitute_start (hb_font_t *font, hb_buffer_t *buffer); namespace OT { struct hb_ot_apply_context_t; struct hb_ot_layout_lookup_accelerator_t; namespace Layout { namespace GSUB_impl { struct SubstLookup; } } } HB_INTERNAL void hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c, const OT::Layout::GSUB_impl::SubstLookup &lookup, const OT::hb_ot_layout_lookup_accelerator_t &accel); /* Should be called before all the position_lookup's are done. */ HB_INTERNAL void hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer); /* Should be called after all the position_lookup's are done, to fini advances. */ HB_INTERNAL void hb_ot_layout_position_finish_advances (hb_font_t *font, hb_buffer_t *buffer); /* Should be called after hb_ot_layout_position_finish_advances, to fini offsets. */ HB_INTERNAL void hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer); /* * Buffer var routines. */ /* buffer var allocations, used during the entire shaping process */ #define unicode_props() … /* buffer var allocations, used during the GSUB/GPOS processing */ #define glyph_props … #define lig_props … #define syllable() … /* Loop over syllables. Based on foreach_cluster(). */ #define foreach_syllable(buffer, start, end) … static inline unsigned int _hb_next_syllable (hb_buffer_t *buffer, unsigned int start) { … } /* unicode_props */ /* Design: * unicode_props() is a two-byte number. The low byte includes: * - Extended General_Category: 5 bits. * - A bit each for: * * Is it Default_Ignorable(); we have a modified Default_Ignorable(). * * Whether it's one of the four Mongolian Free Variation Selectors, * CGJ, or other characters that are hidden but should not be ignored * like most other Default_Ignorable()s do during GSUB matching. * * Whether it's a grapheme continuation. * * The high-byte has different meanings, switched by the Gen-Cat: * - For Mn,Mc,Me: the modified Combining_Class. * - For Cf: whether it's ZWJ, ZWNJ, or something else. * - For Ws: index of which space character this is, if space fallback * is needed, ie. we don't set this by default, only if asked to. */ enum hb_unicode_props_flags_t { … }; HB_MARK_AS_FLAG_T (hb_unicode_props_flags_t); static inline void _hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_buffer_t *buffer) { … } static inline void _hb_glyph_info_set_general_category (hb_glyph_info_t *info, hb_unicode_general_category_t gen_cat) { … } static inline hb_unicode_general_category_t _hb_glyph_info_get_general_category (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_is_unicode_mark (const hb_glyph_info_t *info) { … } static inline void _hb_glyph_info_set_modified_combining_class (hb_glyph_info_t *info, unsigned int modified_class) { … } static inline unsigned int _hb_glyph_info_get_modified_combining_class (const hb_glyph_info_t *info) { … } #define info_cc(info) … static inline bool _hb_glyph_info_is_unicode_space (const hb_glyph_info_t *info) { … } static inline void _hb_glyph_info_set_unicode_space_fallback_type (hb_glyph_info_t *info, hb_unicode_funcs_t::space_t s) { … } static inline hb_unicode_funcs_t::space_t _hb_glyph_info_get_unicode_space_fallback_type (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_substituted (const hb_glyph_info_t *info); static inline bool _hb_glyph_info_is_default_ignorable (const hb_glyph_info_t *info) { … } static inline void _hb_glyph_info_clear_default_ignorable (hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_is_hidden (const hb_glyph_info_t *info) { … } static inline void _hb_glyph_info_unhide (hb_glyph_info_t *info) { … } static inline void _hb_glyph_info_set_continuation (hb_glyph_info_t *info) { … } static inline void _hb_glyph_info_reset_continuation (hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_is_continuation (const hb_glyph_info_t *info) { … } static inline bool _hb_grapheme_group_func (const hb_glyph_info_t& a HB_UNUSED, const hb_glyph_info_t& b) { … } #define foreach_grapheme(buffer, start, end) … static inline void _hb_ot_layout_reverse_graphemes (hb_buffer_t *buffer) { … } static inline bool _hb_glyph_info_is_unicode_format (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_is_zwnj (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_is_zwj (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_is_joiner (const hb_glyph_info_t *info) { … } static inline void _hb_glyph_info_flip_joiners (hb_glyph_info_t *info) { … } /* lig_props: aka lig_id / lig_comp * * When a ligature is formed: * * - The ligature glyph and any marks in between all the same newly allocated * lig_id, * - The ligature glyph will get lig_num_comps set to the number of components * - The marks get lig_comp > 0, reflecting which component of the ligature * they were applied to. * - This is used in GPOS to attach marks to the right component of a ligature * in MarkLigPos, * - Note that when marks are ligated together, much of the above is skipped * and the current lig_id reused. * * When a multiple-substitution is done: * * - All resulting glyphs will have lig_id = 0, * - The resulting glyphs will have lig_comp = 0, 1, 2, ... respectively. * - This is used in GPOS to attach marks to the first component of a * multiple substitution in MarkBasePos. * * The numbers are also used in GPOS to do mark-to-mark positioning only * to marks that belong to the same component of the same ligature. */ static inline void _hb_glyph_info_clear_lig_props (hb_glyph_info_t *info) { … } #define IS_LIG_BASE … static inline void _hb_glyph_info_set_lig_props_for_ligature (hb_glyph_info_t *info, unsigned int lig_id, unsigned int lig_num_comps) { … } static inline void _hb_glyph_info_set_lig_props_for_mark (hb_glyph_info_t *info, unsigned int lig_id, unsigned int lig_comp) { … } static inline void _hb_glyph_info_set_lig_props_for_component (hb_glyph_info_t *info, unsigned int comp) { … } static inline unsigned int _hb_glyph_info_get_lig_id (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_ligated_internal (const hb_glyph_info_t *info) { … } static inline unsigned int _hb_glyph_info_get_lig_comp (const hb_glyph_info_t *info) { … } static inline unsigned int _hb_glyph_info_get_lig_num_comps (const hb_glyph_info_t *info) { … } static inline uint8_t _hb_allocate_lig_id (hb_buffer_t *buffer) { … } /* glyph_props: */ static inline void _hb_glyph_info_set_glyph_props (hb_glyph_info_t *info, unsigned int props) { … } static inline unsigned int _hb_glyph_info_get_glyph_props (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_is_base_glyph (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_is_ligature (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_is_mark (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_substituted (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_ligated (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_multiplied (const hb_glyph_info_t *info) { … } static inline bool _hb_glyph_info_ligated_and_didnt_multiply (const hb_glyph_info_t *info) { … } static inline void _hb_glyph_info_clear_ligated_and_multiplied (hb_glyph_info_t *info) { … } static inline void _hb_glyph_info_clear_substituted (hb_glyph_info_t *info) { … } static inline bool _hb_clear_substitution_flags (const hb_ot_shape_plan_t *plan HB_UNUSED, hb_font_t *font HB_UNUSED, hb_buffer_t *buffer) { … } /* Allocation / deallocation. */ static inline void _hb_buffer_allocate_unicode_vars (hb_buffer_t *buffer) { … } static inline void _hb_buffer_deallocate_unicode_vars (hb_buffer_t *buffer) { … } static inline void _hb_buffer_assert_unicode_vars (hb_buffer_t *buffer) { … } static inline void _hb_buffer_allocate_gsubgpos_vars (hb_buffer_t *buffer) { … } static inline void _hb_buffer_deallocate_gsubgpos_vars (hb_buffer_t *buffer) { … } static inline void _hb_buffer_assert_gsubgpos_vars (hb_buffer_t *buffer) { … } /* Make sure no one directly touches our props... */ #undef unicode_props0 #undef unicode_props1 #undef lig_props #undef glyph_props #endif /* HB_OT_LAYOUT_HH */
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