274 lines
7.7 KiB
C++
274 lines
7.7 KiB
C++
/*
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* Copyright © 2007,2008,2009 Red Hat, Inc.
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* Copyright © 2012 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_LAYOUT_PRIVATE_HH
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#define HB_OT_LAYOUT_PRIVATE_HH
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#include "hb-private.hh"
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#include "hb-ot-layout.h"
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#include "hb-font-private.hh"
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#include "hb-buffer-private.hh"
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#include "hb-set-private.hh"
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/* buffer var allocations, used during the GSUB/GPOS processing */
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#define glyph_props() var1.u16[0] /* GDEF glyph properties */
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#define syllable() var1.u8[2] /* GSUB/GPOS shaping boundaries */
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#define lig_props() var1.u8[3] /* GSUB/GPOS ligature tracking */
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/* buffer var allocations, used during the entire shaping process */
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#define unicode_props0() var2.u8[0]
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#define unicode_props1() var2.u8[1]
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inline void
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_hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_unicode_funcs_t *unicode)
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{
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info->unicode_props0() = ((unsigned int) unicode->general_category (info->codepoint)) |
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(unicode->is_default_ignorable (info->codepoint) ? 0x80 : 0) |
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(info->codepoint == 0x200C ? 0x40 : 0) |
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(info->codepoint == 0x200D ? 0x20 : 0);
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info->unicode_props1() = unicode->modified_combining_class (info->codepoint);
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}
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inline hb_unicode_general_category_t
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_hb_glyph_info_get_general_category (const hb_glyph_info_t *info)
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{
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return (hb_unicode_general_category_t) (info->unicode_props0() & 0x1F);
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}
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inline void
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_hb_glyph_info_set_modified_combining_class (hb_glyph_info_t *info, unsigned int modified_class)
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{
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info->unicode_props1() = modified_class;
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}
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inline unsigned int
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_hb_glyph_info_get_modified_combining_class (const hb_glyph_info_t *info)
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{
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return info->unicode_props1();
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}
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inline hb_bool_t
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_hb_glyph_info_is_default_ignorable (const hb_glyph_info_t *info)
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{
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return !!(info->unicode_props0() & 0x80);
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}
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inline hb_bool_t
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_hb_glyph_info_is_zwnj (const hb_glyph_info_t *info)
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{
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return !!(info->unicode_props0() & 0x40);
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}
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inline hb_bool_t
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_hb_glyph_info_is_zwj (const hb_glyph_info_t *info)
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{
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return !!(info->unicode_props0() & 0x20);
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}
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#define hb_ot_layout_from_face(face) ((hb_ot_layout_t *) face->shaper_data.ot)
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/*
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* GDEF
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*/
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typedef enum {
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HB_OT_LAYOUT_GLYPH_PROPS_UNCLASSIFIED = 1 << HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED,
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HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH = 1 << HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH,
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HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE = 1 << HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE,
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HB_OT_LAYOUT_GLYPH_PROPS_MARK = 1 << HB_OT_LAYOUT_GLYPH_CLASS_MARK,
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HB_OT_LAYOUT_GLYPH_PROPS_COMPONENT = 1 << HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT
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} hb_ot_layout_glyph_class_mask_t;
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/*
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* GSUB/GPOS
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*/
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/* lig_id / lig_comp
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*
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* When a ligature is formed:
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*
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* - The ligature glyph and any marks in between all the same newly allocated
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* lig_id,
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* - The ligature glyph will get lig_num_comps set to the number of components
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* - The marks get lig_comp > 0, reflecting which component of the ligature
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* they were applied to.
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* - This is used in GPOS to attach marks to the right component of a ligature
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* in MarkLigPos.
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*
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* When a multiple-substitution is done:
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*
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* - All resulting glyphs will have lig_id = 0,
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* - The resulting glyphs will have lig_comp = 0, 1, 2, ... respectively.
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* - This is used in GPOS to attach marks to the first component of a
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* multiple substitution in MarkBasePos.
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*
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* The numbers are also used in GPOS to do mark-to-mark positioning only
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* to marks that belong to the same component of a ligature in MarkMarPos.
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*/
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#define IS_LIG_BASE 0x10
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static inline void
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set_lig_props_for_ligature (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_num_comps)
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{
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info.lig_props() = (lig_id << 5) | IS_LIG_BASE | (lig_num_comps & 0x0F);
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}
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static inline void
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set_lig_props_for_mark (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_comp)
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{
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info.lig_props() = (lig_id << 5) | (lig_comp & 0x0F);
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}
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static inline void
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set_lig_props_for_component (hb_glyph_info_t &info, unsigned int comp)
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{
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set_lig_props_for_mark (info, 0, comp);
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}
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static inline unsigned int
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get_lig_id (const hb_glyph_info_t &info)
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{
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return info.lig_props() >> 5;
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}
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static inline bool
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is_a_ligature (const hb_glyph_info_t &info)
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{
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return !!(info.lig_props() & IS_LIG_BASE);
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}
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static inline unsigned int
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get_lig_comp (const hb_glyph_info_t &info)
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{
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if (is_a_ligature (info))
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return 0;
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else
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return info.lig_props() & 0x0F;
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}
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static inline unsigned int
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get_lig_num_comps (const hb_glyph_info_t &info)
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{
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if ((info.glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) && is_a_ligature (info))
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return info.lig_props() & 0x0F;
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else
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return 1;
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}
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static inline uint8_t allocate_lig_id (hb_buffer_t *buffer) {
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uint8_t lig_id = buffer->next_serial () & 0x07;
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if (unlikely (!lig_id))
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lig_id = allocate_lig_id (buffer); /* in case of overflow */
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return lig_id;
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}
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HB_INTERNAL hb_bool_t
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hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
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unsigned int lookup_index,
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const hb_codepoint_t *glyphs,
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unsigned int glyphs_length,
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hb_bool_t zero_context);
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/* Should be called before all the substitute_lookup's are done. */
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HB_INTERNAL void
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hb_ot_layout_substitute_start (hb_font_t *font,
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hb_buffer_t *buffer);
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HB_INTERNAL hb_bool_t
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hb_ot_layout_substitute_lookup (hb_font_t *font,
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hb_buffer_t *buffer,
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unsigned int lookup_index,
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hb_mask_t mask,
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hb_bool_t auto_joiners);
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/* Should be called after all the substitute_lookup's are done */
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HB_INTERNAL void
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hb_ot_layout_substitute_finish (hb_font_t *font,
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hb_buffer_t *buffer);
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/* Should be called before all the position_lookup's are done. Resets positions to zero. */
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HB_INTERNAL void
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hb_ot_layout_position_start (hb_font_t *font,
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hb_buffer_t *buffer);
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HB_INTERNAL hb_bool_t
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hb_ot_layout_position_lookup (hb_font_t *font,
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hb_buffer_t *buffer,
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unsigned int lookup_index,
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hb_mask_t mask,
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hb_bool_t auto_joiners);
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/* Should be called after all the position_lookup's are done */
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HB_INTERNAL void
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hb_ot_layout_position_finish (hb_font_t *font,
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hb_buffer_t *buffer);
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/*
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* hb_ot_layout_t
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*/
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namespace OT {
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struct GDEF;
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struct GSUB;
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struct GPOS;
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}
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struct hb_ot_layout_t
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{
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hb_blob_t *gdef_blob;
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hb_blob_t *gsub_blob;
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hb_blob_t *gpos_blob;
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const struct OT::GDEF *gdef;
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const struct OT::GSUB *gsub;
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const struct OT::GPOS *gpos;
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unsigned int gsub_lookup_count;
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unsigned int gpos_lookup_count;
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hb_set_digest_t *gsub_digests;
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hb_set_digest_t *gpos_digests;
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};
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HB_INTERNAL hb_ot_layout_t *
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_hb_ot_layout_create (hb_face_t *face);
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HB_INTERNAL void
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_hb_ot_layout_destroy (hb_ot_layout_t *layout);
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#endif /* HB_OT_LAYOUT_PRIVATE_HH */
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