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 * Google Author(s): Behdad Esfahbod 25 */ 26 27 #include "hb-open-type-private.hh" 28 29 #include "hb-ot-layout-private.hh" 30 #include "hb-ot-var-avar-table.hh" 31 #include "hb-ot-var-fvar-table.hh" 32 #include "hb-ot-var-mvar-table.hh" 33 #include "hb-ot-var.h" 34 35 /* 36 * fvar/avar 37 */ 38 39 static inline const OT::fvar& 40 _get_fvar (hb_face_t *face) 41 { 42 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::fvar); 43 hb_ot_layout_t * layout = hb_ot_layout_from_face (face); 44 return *(layout->fvar.get ()); 45 } 46 static inline const OT::avar& 47 _get_avar (hb_face_t *face) 48 { 49 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::avar); 50 hb_ot_layout_t * layout = hb_ot_layout_from_face (face); 51 return *(layout->avar.get ()); 52 } 53 54 /** 55 * hb_ot_var_has_data: 56 * @face: #hb_face_t to test 57 * 58 * This function allows to verify the presence of OpenType variation data on the face. 59 * Alternatively, use hb_ot_var_get_axis_count(). 60 * 61 * Return value: true if face has a `fvar' table and false otherwise 62 * 63 * Since: 1.4.2 64 **/ 65 hb_bool_t 66 hb_ot_var_has_data (hb_face_t *face) 67 { 68 return &_get_fvar (face) != &OT::Null(OT::fvar); 69 } 70 71 /** 72 * hb_ot_var_get_axis_count: 73 * 74 * Since: 1.4.2 75 **/ 76 unsigned int 77 hb_ot_var_get_axis_count (hb_face_t *face) 78 { 79 const OT::fvar &fvar = _get_fvar (face); 80 return fvar.get_axis_count (); 81 } 82 83 /** 84 * hb_ot_var_get_axes: 85 * 86 * Since: 1.4.2 87 **/ 88 unsigned int 89 hb_ot_var_get_axes (hb_face_t *face, 90 unsigned int start_offset, 91 unsigned int *axes_count /* IN/OUT */, 92 hb_ot_var_axis_t *axes_array /* OUT */) 93 { 94 const OT::fvar &fvar = _get_fvar (face); 95 return fvar.get_axis_infos (start_offset, axes_count, axes_array); 96 } 97 98 /** 99 * hb_ot_var_find_axis: 100 * 101 * Since: 1.4.2 102 **/ 103 hb_bool_t 104 hb_ot_var_find_axis (hb_face_t *face, 105 hb_tag_t axis_tag, 106 unsigned int *axis_index, 107 hb_ot_var_axis_t *axis_info) 108 { 109 const OT::fvar &fvar = _get_fvar (face); 110 return fvar.find_axis (axis_tag, axis_index, axis_info); 111 } 112 113 114 /** 115 * hb_ot_var_normalize_variations: 116 * 117 * Since: 1.4.2 118 **/ 119 void 120 hb_ot_var_normalize_variations (hb_face_t *face, 121 const hb_variation_t *variations, /* IN */ 122 unsigned int variations_length, 123 int *coords, /* OUT */ 124 unsigned int coords_length) 125 { 126 for (unsigned int i = 0; i < coords_length; i++) 127 coords[i] = 0; 128 129 const OT::fvar &fvar = _get_fvar (face); 130 for (unsigned int i = 0; i < variations_length; i++) 131 { 132 unsigned int axis_index; 133 if (hb_ot_var_find_axis (face, variations[i].tag, &axis_index, nullptr) && 134 axis_index < coords_length) 135 coords[axis_index] = fvar.normalize_axis_value (axis_index, variations[i].value); 136 } 137 138 const OT::avar &avar = _get_avar (face); 139 avar.map_coords (coords, coords_length); 140 } 141 142 /** 143 * hb_ot_var_normalize_coords: 144 * 145 * Since: 1.4.2 146 **/ 147 void 148 hb_ot_var_normalize_coords (hb_face_t *face, 149 unsigned int coords_length, 150 const float *design_coords, /* IN */ 151 int *normalized_coords /* OUT */) 152 { 153 const OT::fvar &fvar = _get_fvar (face); 154 for (unsigned int i = 0; i < coords_length; i++) 155 normalized_coords[i] = fvar.normalize_axis_value (i, design_coords[i]); 156 157 const OT::avar &avar = _get_avar (face); 158 avar.map_coords (normalized_coords, coords_length); 159 } 160