1 /*

     2  * Copyright © 2010  Google, Inc.

     3  *

     4  *  This is part of HarfBuzz, a text shaping library.

     5  *

     6  * Permission is hereby granted, without written agreement and without

     7  * license or royalty fees, to use, copy, modify, and distribute this

     8  * software and its documentation for any purpose, provided that the

     9  * above copyright notice and the following two paragraphs appear in

    10  * all copies of this software.

    11  *

    12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR

    13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES

    14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN

    15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH

    16  * DAMAGE.

    17  *

    18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,

    19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

    20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS

    21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO

    22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

    23  *

    24  * Google Author(s): Behdad Esfahbod

    25  */

    26 

    27 #ifndef HB_OT_SHAPE_PRIVATE_HH

    28 #define HB_OT_SHAPE_PRIVATE_HH

    29 

    30 #include "hb-private.hh"

    31 

    32 #include "hb-ot-map-private.hh"

    33 #include "hb-ot-layout-private.hh"

    34 

    35 

    36 

    37 struct hb_ot_shape_plan_t

    38 {

    39   hb_segment_properties_t props;

    40   const struct hb_ot_complex_shaper_t *shaper;

    41   hb_ot_map_t map;

    42   const void *data;

    43   hb_mask_t rtlm_mask, frac_mask, numr_mask, dnom_mask;

    44   hb_mask_t kern_mask;

    45   unsigned int has_frac : 1;

    46   unsigned int has_kern : 1;

    47   unsigned int has_mark : 1;

    48 

    49   inline void collect_lookups (hb_tag_t table_tag, hb_set_t *lookups) const

    50   {

    51     unsigned int table_index;

    52     switch (table_tag) {

    53       case HB_OT_TAG_GSUB: table_index = 0; break;

    54       case HB_OT_TAG_GPOS: table_index = 1; break;

    55       default: return;

    56     }

    57     map.collect_lookups (table_index, lookups);

    58   }

    59   inline void substitute (hb_font_t *font, hb_buffer_t *buffer) const { map.substitute (this, font, buffer); }

    60   inline void position (hb_font_t *font, hb_buffer_t *buffer) const { map.position (this, font, buffer); }

    61 

    62   void init (void)

    63   {

    64     memset (this, 0, sizeof (*this));

    65     map.init ();

    66   }

    67   void fini (void) {

    68     map.fini ();

    69   }

    70 };

    71 

    72 struct hb_ot_shape_planner_t

    73 {

    74   /* In the order that they are filled in. */

    75   hb_face_t *face;

    76   hb_segment_properties_t props;

    77   const struct hb_ot_complex_shaper_t *shaper;

    78   hb_ot_map_builder_t map;

    79 

    80   hb_ot_shape_planner_t (const hb_shape_plan_t *master_plan) :

    81                          face (master_plan->face_unsafe),

    82                          props (master_plan->props),

    83                          shaper (nullptr),

    84                          map (face, &props) {}

    85 

    86   inline void compile (hb_ot_shape_plan_t &plan,

    87                        const int          *coords,

    88                        unsigned int        num_coords)

    89   {

    90     plan.props = props;

    91     plan.shaper = shaper;

    92     map.compile (plan.map, coords, num_coords);

    93 

    94     plan.rtlm_mask = plan.map.get_1_mask (HB_TAG ('r','t','l','m'));

    95     plan.frac_mask = plan.map.get_1_mask (HB_TAG ('f','r','a','c'));

    96     plan.numr_mask = plan.map.get_1_mask (HB_TAG ('n','u','m','r'));

    97     plan.dnom_mask = plan.map.get_1_mask (HB_TAG ('d','n','o','m'));

    98 

    99     plan.kern_mask = plan.map.get_mask (HB_DIRECTION_IS_HORIZONTAL (plan.props.direction) ?

   100                                         HB_TAG ('k','e','r','n') : HB_TAG ('v','k','r','n'));

   101 

   102     plan.has_frac = plan.frac_mask || (plan.numr_mask && plan.dnom_mask);

   103     plan.has_kern = !!plan.kern_mask;

   104     plan.has_mark = !!plan.map.get_1_mask (HB_TAG ('m','a','r','k'));

   105   }

   106 

   107   private:

   108   HB_DISALLOW_COPY_AND_ASSIGN (hb_ot_shape_planner_t);

   109 };

   110 

   111 

   112 #endif /* HB_OT_SHAPE_PRIVATE_HH */