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1 /*
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2 * Copyright © 2018 Ebrahim Byagowi
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3 *
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4 * This is part of HarfBuzz, a text shaping library.
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5 *
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6 * Permission is hereby granted, without written agreement and without
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7 * license or royalty fees, to use, copy, modify, and distribute this
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8 * software and its documentation for any purpose, provided that the
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9 * above copyright notice and the following two paragraphs appear in
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10 * all copies of this software.
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11 *
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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16 * DAMAGE.
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17 *
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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23 */
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24
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25 #ifndef HB_OT_H_IN
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26 #error "Include <hb-ot.h> instead."
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27 #endif
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28
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29 #ifndef HB_OT_METRICS_H
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30 #define HB_OT_METRICS_H
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31
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32 #include "hb.h"
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33 #include "hb-ot-name.h"
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34
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35 HB_BEGIN_DECLS
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36
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37
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38 /**
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39 * hb_ot_metrics_tag_t:
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40 * @HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER: horizontal ascender.
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41 * @HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER: horizontal descender.
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42 * @HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP: horizontal line gap.
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43 * @HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT: horizontal clipping ascent.
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44 * @HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT: horizontal clipping descent.
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45 * @HB_OT_METRICS_TAG_VERTICAL_ASCENDER: vertical ascender.
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46 * @HB_OT_METRICS_TAG_VERTICAL_DESCENDER: vertical descender.
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47 * @HB_OT_METRICS_TAG_VERTICAL_LINE_GAP: vertical line gap.
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48 * @HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE: horizontal caret rise.
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49 * @HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN: horizontal caret run.
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50 * @HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET: horizontal caret offset.
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51 * @HB_OT_METRICS_TAG_VERTICAL_CARET_RISE: vertical caret rise.
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52 * @HB_OT_METRICS_TAG_VERTICAL_CARET_RUN: vertical caret run.
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53 * @HB_OT_METRICS_TAG_VERTICAL_CARET_OFFSET: vertical caret offset.
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54 * @HB_OT_METRICS_TAG_X_HEIGHT: x height.
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55 * @HB_OT_METRICS_TAG_CAP_HEIGHT: cap height.
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56 * @HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE: subscript em x size.
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57 * @HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE: subscript em y size.
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58 * @HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET: subscript em x offset.
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59 * @HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET: subscript em y offset.
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60 * @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE: superscript em x size.
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61 * @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE: superscript em y size.
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62 * @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET: superscript em x offset.
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63 * @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET: superscript em y offset.
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64 * @HB_OT_METRICS_TAG_STRIKEOUT_SIZE: strikeout size.
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65 * @HB_OT_METRICS_TAG_STRIKEOUT_OFFSET: strikeout offset.
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66 * @HB_OT_METRICS_TAG_UNDERLINE_SIZE: underline size.
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67 * @HB_OT_METRICS_TAG_UNDERLINE_OFFSET: underline offset.
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68 *
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69 * From https://docs.microsoft.com/en-us/typography/opentype/spec/mvar#value-tags
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70 *
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71 * Since: 2.6.0
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72 **/
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73 typedef enum {
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74 HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER = HB_TAG ('h','a','s','c'),
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75 HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER = HB_TAG ('h','d','s','c'),
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76 HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP = HB_TAG ('h','l','g','p'),
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77 HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT = HB_TAG ('h','c','l','a'),
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78 HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT = HB_TAG ('h','c','l','d'),
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79 HB_OT_METRICS_TAG_VERTICAL_ASCENDER = HB_TAG ('v','a','s','c'),
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80 HB_OT_METRICS_TAG_VERTICAL_DESCENDER = HB_TAG ('v','d','s','c'),
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81 HB_OT_METRICS_TAG_VERTICAL_LINE_GAP = HB_TAG ('v','l','g','p'),
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82 HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE = HB_TAG ('h','c','r','s'),
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83 HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN = HB_TAG ('h','c','r','n'),
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84 HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET = HB_TAG ('h','c','o','f'),
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85 HB_OT_METRICS_TAG_VERTICAL_CARET_RISE = HB_TAG ('v','c','r','s'),
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86 HB_OT_METRICS_TAG_VERTICAL_CARET_RUN = HB_TAG ('v','c','r','n'),
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87 HB_OT_METRICS_TAG_VERTICAL_CARET_OFFSET = HB_TAG ('v','c','o','f'),
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88 HB_OT_METRICS_TAG_X_HEIGHT = HB_TAG ('x','h','g','t'),
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89 HB_OT_METRICS_TAG_CAP_HEIGHT = HB_TAG ('c','p','h','t'),
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90 HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE = HB_TAG ('s','b','x','s'),
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91 HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE = HB_TAG ('s','b','y','s'),
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92 HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET = HB_TAG ('s','b','x','o'),
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93 HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET = HB_TAG ('s','b','y','o'),
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94 HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE = HB_TAG ('s','p','x','s'),
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95 HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE = HB_TAG ('s','p','y','s'),
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96 HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET = HB_TAG ('s','p','x','o'),
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97 HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET = HB_TAG ('s','p','y','o'),
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98 HB_OT_METRICS_TAG_STRIKEOUT_SIZE = HB_TAG ('s','t','r','s'),
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99 HB_OT_METRICS_TAG_STRIKEOUT_OFFSET = HB_TAG ('s','t','r','o'),
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100 HB_OT_METRICS_TAG_UNDERLINE_SIZE = HB_TAG ('u','n','d','s'),
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101 HB_OT_METRICS_TAG_UNDERLINE_OFFSET = HB_TAG ('u','n','d','o'),
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102
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103 _HB_OT_METRICS_TAG_MAX_VALUE = HB_TAG_MAX_SIGNED /*< skip >*/
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104 } hb_ot_metrics_tag_t;
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105
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106 HB_EXTERN hb_bool_t
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107 hb_ot_metrics_get_position (hb_font_t *font,
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108 hb_ot_metrics_tag_t metrics_tag,
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109 hb_position_t *position /* OUT. May be NULL. */);
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110
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111 HB_EXTERN float
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112 hb_ot_metrics_get_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag);
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113
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114 HB_EXTERN hb_position_t
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115 hb_ot_metrics_get_x_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag);
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116
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117 HB_EXTERN hb_position_t
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118 hb_ot_metrics_get_y_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag);
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119
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120 HB_END_DECLS
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121
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122 #endif /* HB_OT_METRICS_H */
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