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-/*
- * Copyright © 2007,2008,2009 Red Hat, Inc.
- * Copyright © 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_LAYOUT_PRIVATE_HH
-#define HB_OT_LAYOUT_PRIVATE_HH
-
-#include "hb-private.hh"
-
-#include "hb-ot-layout.h"
-
-#include "hb-font-private.hh"
-#include "hb-buffer-private.hh"
-#include "hb-set-private.hh"
-
-
-/* buffer var allocations, used during the GSUB/GPOS processing */
-#define glyph_props() var1.u16[0] /* GDEF glyph properties */
-#define syllable() var1.u8[2] /* GSUB/GPOS shaping boundaries */
-#define lig_props() var1.u8[3] /* GSUB/GPOS ligature tracking */
-
-/* buffer var allocations, used during the entire shaping process */
-#define unicode_props0() var2.u8[0]
-#define unicode_props1() var2.u8[1]
-
-
-inline void
-_hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_unicode_funcs_t *unicode)
-{
- info->unicode_props0() = ((unsigned int) unicode->general_category (info->codepoint)) |
- (unicode->is_default_ignorable (info->codepoint) ? 0x80 : 0) |
- (info->codepoint == 0x200C ? 0x40 : 0) |
- (info->codepoint == 0x200D ? 0x20 : 0);
- info->unicode_props1() = unicode->modified_combining_class (info->codepoint);
-}
-
-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() & 0x1F);
-}
-
-inline void
-_hb_glyph_info_set_modified_combining_class (hb_glyph_info_t *info, unsigned int modified_class)
-{
- info->unicode_props1() = modified_class;
-}
-
-inline unsigned int
-_hb_glyph_info_get_modified_combining_class (const hb_glyph_info_t *info)
-{
- return info->unicode_props1();
-}
-
-inline hb_bool_t
-_hb_glyph_info_is_default_ignorable (const hb_glyph_info_t *info)
-{
- return !!(info->unicode_props0() & 0x80);
-}
-
-inline hb_bool_t
-_hb_glyph_info_is_zwnj (const hb_glyph_info_t *info)
-{
- return !!(info->unicode_props0() & 0x40);
-}
-
-inline hb_bool_t
-_hb_glyph_info_is_zwj (const hb_glyph_info_t *info)
-{
- return !!(info->unicode_props0() & 0x20);
-}
-
-
-#define hb_ot_layout_from_face(face) ((hb_ot_layout_t *) face->shaper_data.ot)
-
-/*
- * GDEF
- */
-
-typedef enum {
- HB_OT_LAYOUT_GLYPH_PROPS_UNCLASSIFIED = 1 << HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED,
- HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH = 1 << HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH,
- HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE = 1 << HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE,
- HB_OT_LAYOUT_GLYPH_PROPS_MARK = 1 << HB_OT_LAYOUT_GLYPH_CLASS_MARK,
- HB_OT_LAYOUT_GLYPH_PROPS_COMPONENT = 1 << HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT
-} hb_ot_layout_glyph_class_mask_t;
-
-
-
-/*
- * GSUB/GPOS
- */
-
-/* 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.
- *
- * 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 a ligature in MarkMarPos.
- */
-#define IS_LIG_BASE 0x10
-static inline void
-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
-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
-set_lig_props_for_component (hb_glyph_info_t &info, unsigned int comp)
-{
- set_lig_props_for_mark (info, 0, comp);
-}
-
-static inline unsigned int
-get_lig_id (const hb_glyph_info_t &info)
-{
- return info.lig_props() >> 5;
-}
-static inline bool
-is_a_ligature (const hb_glyph_info_t &info)
-{
- return !!(info.lig_props() & IS_LIG_BASE);
-}
-static inline unsigned int
-get_lig_comp (const hb_glyph_info_t &info)
-{
- if (is_a_ligature (info))
- return 0;
- else
- return info.lig_props() & 0x0F;
-}
-static inline unsigned int
-get_lig_num_comps (const hb_glyph_info_t &info)
-{
- if ((info.glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) && is_a_ligature (info))
- return info.lig_props() & 0x0F;
- else
- return 1;
-}
-
-static inline uint8_t allocate_lig_id (hb_buffer_t *buffer) {
- uint8_t lig_id = buffer->next_serial () & 0x07;
- if (unlikely (!lig_id))
- lig_id = allocate_lig_id (buffer); /* in case of overflow */
- return lig_id;
-}
-
-
-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);
-
-HB_INTERNAL hb_bool_t
-hb_ot_layout_substitute_lookup (hb_font_t *font,
- hb_buffer_t *buffer,
- unsigned int lookup_index,
- hb_mask_t mask,
- hb_bool_t auto_zwj);
-
-/* 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);
-
-HB_INTERNAL hb_bool_t
-hb_ot_layout_position_lookup (hb_font_t *font,
- hb_buffer_t *buffer,
- unsigned int lookup_index,
- hb_mask_t mask,
- hb_bool_t auto_zwj);
-
-/* 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_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_set_digest_t *gsub_digests;
- hb_set_digest_t *gpos_digests;
-};
-
-
-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);
-
-
-
-#endif /* HB_OT_LAYOUT_PRIVATE_HH */