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      1 /*
      2  * Copyright  2017  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  * Red Hat Author(s): Behdad Esfahbod
     25  */
     26 
     27 #ifndef HB_OT_H_IN
     28 #error "Include <hb-ot.h> instead."
     29 #endif
     30 
     31 #ifndef HB_OT_VAR_H
     32 #define HB_OT_VAR_H
     33 
     34 #include "hb.h"
     35 
     36 HB_BEGIN_DECLS
     37 
     38 
     39 #define HB_OT_TAG_VAR_AXIS_ITALIC	HB_TAG('i','t','a','l')
     40 #define HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE	HB_TAG('o','p','s','z')
     41 #define HB_OT_TAG_VAR_AXIS_SLANT	HB_TAG('s','l','n','t')
     42 #define HB_OT_TAG_VAR_AXIS_WIDTH	HB_TAG('w','d','t','h')
     43 #define HB_OT_TAG_VAR_AXIS_WEIGHT	HB_TAG('w','g','h','t')
     44 
     45 
     46 /*
     47  * fvar / avar
     48  */
     49 
     50 /**
     51  * hb_ot_var_axis_t:
     52  *
     53  * Since: 1.4.2
     54  */
     55 typedef struct hb_ot_var_axis_t {
     56   hb_tag_t tag;
     57   unsigned int name_id;
     58   float min_value;
     59   float default_value;
     60   float max_value;
     61 } hb_ot_var_axis_t;
     62 
     63 HB_EXTERN hb_bool_t
     64 hb_ot_var_has_data (hb_face_t *face);
     65 
     66 /**
     67  * HB_OT_VAR_NO_AXIS_INDEX:
     68  *
     69  * Since: 1.4.2
     70  */
     71 #define HB_OT_VAR_NO_AXIS_INDEX		0xFFFFFFFFu
     72 
     73 HB_EXTERN unsigned int
     74 hb_ot_var_get_axis_count (hb_face_t *face);
     75 
     76 HB_EXTERN unsigned int
     77 hb_ot_var_get_axes (hb_face_t        *face,
     78 		    unsigned int      start_offset,
     79 		    unsigned int     *axes_count /* IN/OUT */,
     80 		    hb_ot_var_axis_t *axes_array /* OUT */);
     81 
     82 HB_EXTERN hb_bool_t
     83 hb_ot_var_find_axis (hb_face_t        *face,
     84 		     hb_tag_t          axis_tag,
     85 		     unsigned int     *axis_index,
     86 		     hb_ot_var_axis_t *axis_info);
     87 
     88 
     89 HB_EXTERN void
     90 hb_ot_var_normalize_variations (hb_face_t            *face,
     91 				const hb_variation_t *variations, /* IN */
     92 				unsigned int          variations_length,
     93 				int                  *coords, /* OUT */
     94 				unsigned int          coords_length);
     95 
     96 HB_EXTERN void
     97 hb_ot_var_normalize_coords (hb_face_t    *face,
     98 			    unsigned int coords_length,
     99 			    const float *design_coords, /* IN */
    100 			    int *normalized_coords /* OUT */);
    101 
    102 
    103 HB_END_DECLS
    104 
    105 #endif /* HB_OT_VAR_H */
    106