third_party/harfbuzz-ng/src/hb-ot-shape-private.hh

   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 finish (void) { map.finish (); }
  63 };
  64
  65 struct hb_ot_shape_planner_t
  66 {
  67   /* In the order that they are filled in. */
  68   hb_face_t *face;
  69   hb_segment_properties_t props;
  70   const struct hb_ot_complex_shaper_t *shaper;
  71   hb_ot_map_builder_t map;
  72
  73   hb_ot_shape_planner_t (const hb_shape_plan_t *master_plan) :
  74                          face (master_plan->face_unsafe),
  75                          props (master_plan->props),
  76                          shaper (NULL),
  77                          map (face, &props) {}
  78   ~hb_ot_shape_planner_t (void) { map.finish (); }
  79
  80   inline void compile (hb_ot_shape_plan_t &plan)
  81   {
  82     plan.props = props;
  83     plan.shaper = shaper;
  84     map.compile (plan.map);
  85
  86     plan.rtlm_mask = plan.map.get_1_mask (HB_TAG ('r','t','l','m'));
  87     plan.frac_mask = plan.map.get_1_mask (HB_TAG ('f','r','a','c'));
  88     plan.numr_mask = plan.map.get_1_mask (HB_TAG ('n','u','m','r'));
  89     plan.dnom_mask = plan.map.get_1_mask (HB_TAG ('d','n','o','m'));
  90
  91     plan.kern_mask = plan.map.get_mask (HB_DIRECTION_IS_HORIZONTAL (plan.props.direction) ?
  92                                         HB_TAG ('k','e','r','n') : HB_TAG ('v','k','r','n'));
  93
  94     plan.has_frac = plan.frac_mask || (plan.numr_mask && plan.dnom_mask);
  95     plan.has_kern = !!plan.kern_mask;
  96     plan.has_mark = !!plan.map.get_1_mask (HB_TAG ('m','a','r','k'));
  97   }
  98
  99   private:
 100   NO_COPY (hb_ot_shape_planner_t);
 101 };
 102
 103
 104 #endif /* HB_OT_SHAPE_PRIVATE_HH */