harfbuzz/src/hb-ot-layout-private.hh

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/*
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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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*
* 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
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_LAYOUT_PRIVATE_HH
#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"
#include "hb-buffer-private.hh"
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/* buffer var allocations, used during the GSUB/GPOS processing */
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#define glyph_props() var1.u16[1] /* GDEF glyph properties */
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#define syllable() var2.u8[0] /* GSUB/GPOS shaping boundaries */
#define lig_props() var2.u8[1] /* GSUB/GPOS ligature tracking */
#define hb_ot_layout_from_face(face) ((hb_ot_layout_t *) face->shaper_data.ot)
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/*
* GDEF
*/
typedef enum {
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HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED = 0x0001,
HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH = 0x0002,
HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE = 0x0004,
HB_OT_LAYOUT_GLYPH_CLASS_MARK = 0x0008,
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HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT = 0x0010
} hb_ot_layout_glyph_class_t;
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/*
* 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,
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* - 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.
*/
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#define IS_LIG_BASE 0x10
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static inline void
set_lig_props_for_ligature (hb_glyph_info_t &info, unsigned int lig_id, unsigned int lig_num_comps)
{
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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);
}
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static inline unsigned int
get_lig_id (const hb_glyph_info_t &info)
{
return info.lig_props() >> 5;
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}
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static inline bool
is_a_ligature (const hb_glyph_info_t &info)
{
return !!(info.lig_props() & IS_LIG_BASE);
}
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static inline unsigned int
get_lig_comp (const hb_glyph_info_t &info)
{
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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)
{
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if ((info.glyph_props() & HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE) && is_a_ligature (info))
return info.lig_props() & 0x0F;
else
return 1;
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}
static inline uint8_t allocate_lig_id (hb_buffer_t *buffer) {
uint8_t lig_id = buffer->next_serial () & 0x07;
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if (unlikely (!lig_id))
lig_id = allocate_lig_id (buffer); /* in case of overflow */
return lig_id;
}
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HB_INTERNAL hb_bool_t
hb_ot_layout_would_substitute_lookup_fast (hb_face_t *face,
const hb_codepoint_t *glyphs,
unsigned int glyphs_length,
unsigned int lookup_index);
HB_INTERNAL hb_bool_t
hb_ot_layout_substitute_lookup_fast (hb_face_t *face,
hb_buffer_t *buffer,
unsigned int lookup_index,
hb_mask_t mask);
HB_INTERNAL hb_bool_t
hb_ot_layout_position_lookup_fast (hb_font_t *font,
hb_buffer_t *buffer,
unsigned int lookup_index,
hb_mask_t mask);
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/*
* hb_ot_layout_t
*/
struct hb_ot_layout_t
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{
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hb_blob_t *gdef_blob;
hb_blob_t *gsub_blob;
hb_blob_t *gpos_blob;
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const struct GDEF *gdef;
const struct GSUB *gsub;
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const struct GPOS *gpos;
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};
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HB_INTERNAL hb_ot_layout_t *
_hb_ot_layout_create (hb_face_t *face);
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HB_INTERNAL void
_hb_ot_layout_destroy (hb_ot_layout_t *layout);
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#endif /* HB_OT_LAYOUT_PRIVATE_HH */