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-/*
- * 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_PRIVATE_HH
-#define HB_OT_LAYOUT_PRIVATE_HH
-
-#include "hb-private.hh"
-
-#include "hb-font-private.hh"
-#include "hb-buffer-private.hh"
-#include "hb-set-private.hh"
-
-
-/* Private API corresponding to hb-ot-layout.h: */
-
-HB_INTERNAL hb_bool_t
-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
- */
-
-typedef enum
-{
- /* The following three match LookupFlags::Ignore* numbers. */
- HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH = 0x02u,
- HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE = 0x04u,
- HB_OT_LAYOUT_GLYPH_PROPS_MARK = 0x08u,
-
- /* The following are used internally; not derived from GDEF. */
- HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED = 0x10u,
- HB_OT_LAYOUT_GLYPH_PROPS_LIGATED = 0x20u,
- HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED = 0x40u,
-
- HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE = HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED |
- HB_OT_LAYOUT_GLYPH_PROPS_LIGATED |
- HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED
-} hb_ot_layout_glyph_class_mask_t;
-
-
-/*
- * GSUB/GPOS
- */
-
-HB_INTERNAL hb_bool_t
-hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
- unsigned int lookup_index,
- const hb_codepoint_t *glyphs,
- unsigned int glyphs_length,
- hb_bool_t zero_context);
-
-
-/* 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);
-
-
-struct hb_ot_layout_lookup_accelerator_t;
-
-namespace OT {
- struct hb_apply_context_t;
- struct SubstLookup;
-}
-
-HB_INTERNAL void
-hb_ot_layout_substitute_lookup (OT::hb_apply_context_t *c,
- const OT::SubstLookup &lookup,
- const hb_ot_layout_lookup_accelerator_t &accel);
-
-
-/* Should be called after all the substitute_lookup's are done */
-HB_INTERNAL void
-hb_ot_layout_substitute_finish (hb_font_t *font,
- hb_buffer_t *buffer);
-
-
-/* Should be called before all the position_lookup's are done. Resets positions to zero. */
-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 */
-HB_INTERNAL void
-hb_ot_layout_position_finish (hb_font_t *font,
- hb_buffer_t *buffer);
-
-
-
-/*
- * hb_ot_layout_t
- */
-
-namespace OT {
- struct GDEF;
- struct GSUB;
- struct GPOS;
-}
-
-struct hb_ot_layout_lookup_accelerator_t
-{
- template <typename TLookup>
- inline void init (const TLookup &lookup)
- {
- digest.init ();
- lookup.add_coverage (&digest);
- }
-
- inline void fini (void)
- {
- }
-
- inline bool may_have (hb_codepoint_t g) const {
- return digest.may_have (g);
- }
-
- private:
- hb_set_digest_t digest;
-};
-
-struct hb_ot_layout_t
-{
- hb_blob_t *gdef_blob;
- hb_blob_t *gsub_blob;
- hb_blob_t *gpos_blob;
-
- const struct OT::GDEF *gdef;
- const struct OT::GSUB *gsub;
- const struct OT::GPOS *gpos;
-
- unsigned int gsub_lookup_count;
- unsigned int gpos_lookup_count;
-
- hb_ot_layout_lookup_accelerator_t *gsub_accels;
- hb_ot_layout_lookup_accelerator_t *gpos_accels;
-};
-
-
-HB_INTERNAL hb_ot_layout_t *
-_hb_ot_layout_create (hb_face_t *face);
-
-HB_INTERNAL void
-_hb_ot_layout_destroy (hb_ot_layout_t *layout);
-
-
-#define hb_ot_layout_from_face(face) ((hb_ot_layout_t *) face->shaper_data.ot)
-
-
-/*
- * Buffer var routines.
- */
-
-/* buffer var allocations, used during the entire shaping process */
-#define unicode_props0() var2.u8[0]
-#define unicode_props1() var2.u8[1]
-
-/* buffer var allocations, used during the GSUB/GPOS processing */
-#define glyph_props() var1.u16[0] /* GDEF glyph properties */
-#define lig_props() var1.u8[2] /* GSUB/GPOS ligature tracking */
-#define syllable() var1.u8[3] /* GSUB/GPOS shaping boundaries */
-
-
-/* loop over syllables */
-
-#define foreach_syllable(buffer, start, end) \
- for (unsigned int \
- _count = buffer->len, \
- start = 0, end = _count ? _next_syllable (buffer, 0) : 0; \
- start < _count; \
- start = end, end = _next_syllable (buffer, start))
-
-static inline unsigned int
-_next_syllable (hb_buffer_t *buffer, unsigned int start)
-{
- hb_glyph_info_t *info = buffer->info;
- unsigned int count = buffer->len;
-
- unsigned int syllable = info[start].syllable();
- while (++start < count && syllable == info[start].syllable())
- ;
-
- return start;
-}
-
-
-/* unicode_props */
-
-enum {
- MASK0_ZWJ = 0x20u,
- MASK0_ZWNJ = 0x40u,
- MASK0_IGNORABLE = 0x80u,
- MASK0_GEN_CAT = 0x1Fu
-};
-
-static inline void
-_hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_unicode_funcs_t *unicode)
-{
- /* XXX This shouldn't be inlined, or at least not while is_default_ignorable() is inline. */
- info->unicode_props0() = ((unsigned int) unicode->general_category (info->codepoint)) |
- (unicode->is_default_ignorable (info->codepoint) ? MASK0_IGNORABLE : 0) |
- (info->codepoint == 0x200Cu ? MASK0_ZWNJ : 0) |
- (info->codepoint == 0x200Du ? MASK0_ZWJ : 0);
- info->unicode_props1() = unicode->modified_combining_class (info->codepoint);
-}
-
-static inline void
-_hb_glyph_info_set_general_category (hb_glyph_info_t *info,
- hb_unicode_general_category_t gen_cat)
-{
- info->unicode_props0() = (unsigned int) gen_cat | ((info->unicode_props0()) & ~MASK0_GEN_CAT);
-}
-
-static inline hb_unicode_general_category_t
-_hb_glyph_info_get_general_category (const hb_glyph_info_t *info)
-{
- return (hb_unicode_general_category_t) (info->unicode_props0() & MASK0_GEN_CAT);
-}
-
-static inline void
-_hb_glyph_info_set_modified_combining_class (hb_glyph_info_t *info,
- unsigned int modified_class)
-{
- info->unicode_props1() = modified_class;
-}
-
-static inline unsigned int
-_hb_glyph_info_get_modified_combining_class (const hb_glyph_info_t *info)
-{
- return info->unicode_props1();
-}
-
-static inline bool _hb_glyph_info_ligated (const hb_glyph_info_t *info);
-
-static inline hb_bool_t
-_hb_glyph_info_is_default_ignorable (const hb_glyph_info_t *info)
-{
- return (info->unicode_props0() & MASK0_IGNORABLE) && !_hb_glyph_info_ligated (info);
-}
-
-static inline hb_bool_t
-_hb_glyph_info_is_zwnj (const hb_glyph_info_t *info)
-{
- return !!(info->unicode_props0() & MASK0_ZWNJ);
-}
-
-static inline hb_bool_t
-_hb_glyph_info_is_zwj (const hb_glyph_info_t *info)
-{
- return !!(info->unicode_props0() & MASK0_ZWJ);
-}
-
-static inline void
-_hb_glyph_info_flip_joiners (hb_glyph_info_t *info)
-{
- info->unicode_props0() ^= MASK0_ZWNJ | MASK0_ZWJ;
-}
-
-/* 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)
-{
- info->lig_props() = 0;
-}
-
-#define IS_LIG_BASE 0x10
-
-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)
-{
- info->lig_props() = (lig_id << 5) | IS_LIG_BASE | (lig_num_comps & 0x0F);
-}
-
-static inline void
-_hb_glyph_info_set_lig_props_for_mark (hb_glyph_info_t *info,
- unsigned int lig_id,
- unsigned int lig_comp)
-{
- info->lig_props() = (lig_id << 5) | (lig_comp & 0x0F);
-}
-
-static inline void
-_hb_glyph_info_set_lig_props_for_component (hb_glyph_info_t *info, unsigned int comp)
-{
- _hb_glyph_info_set_lig_props_for_mark (info, 0, comp);
-}
-
-static inline unsigned int
-_hb_glyph_info_get_lig_id (const hb_glyph_info_t *info)
-{
- return info->lig_props() >> 5;
-}
-
-static inline bool
-_hb_glyph_info_ligated_internal (const hb_glyph_info_t *info)
-{
- return !!(info->lig_props() & IS_LIG_BASE);
-}
-
-static inline unsigned int
-_hb_glyph_info_get_lig_comp (const hb_glyph_info_t *info)
-{
- if (_hb_glyph_info_ligated_internal (info))
- return 0;
- else
- return info->lig_props() & 0x0F;
-}
-
-static inline unsigned int
-_hb_glyph_info_get_lig_num_comps (const hb_glyph_info_t *info)
-{
- if ((info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) &&
- _hb_glyph_info_ligated_internal (info))
- return info->lig_props() & 0x0F;
- else
- return 1;
-}
-
-static inline uint8_t
-_hb_allocate_lig_id (hb_buffer_t *buffer) {
- uint8_t lig_id = buffer->next_serial () & 0x07;
- if (unlikely (!lig_id))
- lig_id = _hb_allocate_lig_id (buffer); /* in case of overflow */
- return lig_id;
-}
-
-/* glyph_props: */
-
-static inline void
-_hb_glyph_info_set_glyph_props (hb_glyph_info_t *info, unsigned int props)
-{
- info->glyph_props() = props;
-}
-
-static inline unsigned int
-_hb_glyph_info_get_glyph_props (const hb_glyph_info_t *info)
-{
- return info->glyph_props();
-}
-
-static inline bool
-_hb_glyph_info_is_base_glyph (const hb_glyph_info_t *info)
-{
- return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH);
-}
-
-static inline bool
-_hb_glyph_info_is_ligature (const hb_glyph_info_t *info)
-{
- return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE);
-}
-
-static inline bool
-_hb_glyph_info_is_mark (const hb_glyph_info_t *info)
-{
- return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_MARK);
-}
-
-static inline bool
-_hb_glyph_info_substituted (const hb_glyph_info_t *info)
-{
- return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED);
-}
-
-static inline bool
-_hb_glyph_info_ligated (const hb_glyph_info_t *info)
-{
- return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATED);
-}
-
-static inline bool
-_hb_glyph_info_multiplied (const hb_glyph_info_t *info)
-{
- return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED);
-}
-
-static inline bool
-_hb_glyph_info_ligated_and_didnt_multiply (const hb_glyph_info_t *info)
-{
- return _hb_glyph_info_ligated (info) && !_hb_glyph_info_multiplied (info);
-}
-
-static inline void
-_hb_glyph_info_clear_ligated_and_multiplied (hb_glyph_info_t *info)
-{
- info->glyph_props() &= ~(HB_OT_LAYOUT_GLYPH_PROPS_LIGATED |
- HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED);
-}
-
-static inline void
-_hb_glyph_info_clear_substituted_and_ligated_and_multiplied (hb_glyph_info_t *info)
-{
- info->glyph_props() &= ~(HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED |
- HB_OT_LAYOUT_GLYPH_PROPS_LIGATED |
- HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED);
-}
-
-
-/* Allocation / deallocation. */
-
-static inline void
-_hb_buffer_allocate_unicode_vars (hb_buffer_t *buffer)
-{
- HB_BUFFER_ALLOCATE_VAR (buffer, unicode_props0);
- HB_BUFFER_ALLOCATE_VAR (buffer, unicode_props1);
-}
-
-static inline void
-_hb_buffer_deallocate_unicode_vars (hb_buffer_t *buffer)
-{
- HB_BUFFER_DEALLOCATE_VAR (buffer, unicode_props0);
- HB_BUFFER_DEALLOCATE_VAR (buffer, unicode_props1);
-}
-
-static inline void
-_hb_buffer_assert_unicode_vars (hb_buffer_t *buffer)
-{
- HB_BUFFER_ASSERT_VAR (buffer, unicode_props0);
- HB_BUFFER_ASSERT_VAR (buffer, unicode_props1);
-}
-
-static inline void
-_hb_buffer_allocate_gsubgpos_vars (hb_buffer_t *buffer)
-{
- HB_BUFFER_ALLOCATE_VAR (buffer, glyph_props);
- HB_BUFFER_ALLOCATE_VAR (buffer, lig_props);
- HB_BUFFER_ALLOCATE_VAR (buffer, syllable);
-}
-
-static inline void
-_hb_buffer_deallocate_gsubgpos_vars (hb_buffer_t *buffer)
-{
- HB_BUFFER_DEALLOCATE_VAR (buffer, syllable);
- HB_BUFFER_DEALLOCATE_VAR (buffer, lig_props);
- HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_props);
-}
-
-static inline void
-_hb_buffer_assert_gsubgpos_vars (hb_buffer_t *buffer)
-{
- HB_BUFFER_ASSERT_VAR (buffer, glyph_props);
- HB_BUFFER_ASSERT_VAR (buffer, lig_props);
- HB_BUFFER_ASSERT_VAR (buffer, syllable);
-}
-
-/* Make sure no one directly touches our props... */
-#undef unicode_props0
-#undef unicode_props1
-#undef lig_props
-#undef glyph_props
-
-
-#endif /* HB_OT_LAYOUT_PRIVATE_HH */