hb-ot-metrics.h
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/*
* Copyright © 2018 Ebrahim Byagowi
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#if !defined(HB_OT_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
#error "Include <hb-ot.h> instead."
#endif
#ifndef HB_OT_METRICS_H
#define HB_OT_METRICS_H
#include "hb.h"
#include "hb-ot-name.h"
HB_BEGIN_DECLS
/**
* hb_ot_metrics_tag_t:
* @HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER: horizontal ascender.
* @HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER: horizontal descender.
* @HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP: horizontal line gap.
* @HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT: horizontal clipping ascent.
* @HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT: horizontal clipping descent.
* @HB_OT_METRICS_TAG_VERTICAL_ASCENDER: vertical ascender.
* @HB_OT_METRICS_TAG_VERTICAL_DESCENDER: vertical descender.
* @HB_OT_METRICS_TAG_VERTICAL_LINE_GAP: vertical line gap.
* @HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE: horizontal caret rise.
* @HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN: horizontal caret run.
* @HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET: horizontal caret offset.
* @HB_OT_METRICS_TAG_VERTICAL_CARET_RISE: vertical caret rise.
* @HB_OT_METRICS_TAG_VERTICAL_CARET_RUN: vertical caret run.
* @HB_OT_METRICS_TAG_VERTICAL_CARET_OFFSET: vertical caret offset.
* @HB_OT_METRICS_TAG_X_HEIGHT: x height.
* @HB_OT_METRICS_TAG_CAP_HEIGHT: cap height.
* @HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE: subscript em x size.
* @HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE: subscript em y size.
* @HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET: subscript em x offset.
* @HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET: subscript em y offset.
* @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE: superscript em x size.
* @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE: superscript em y size.
* @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET: superscript em x offset.
* @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET: superscript em y offset.
* @HB_OT_METRICS_TAG_STRIKEOUT_SIZE: strikeout size.
* @HB_OT_METRICS_TAG_STRIKEOUT_OFFSET: strikeout offset.
* @HB_OT_METRICS_TAG_UNDERLINE_SIZE: underline size.
* @HB_OT_METRICS_TAG_UNDERLINE_OFFSET: underline offset.
*
* Metric tags corresponding to [MVAR Value
* Tags](https://docs.microsoft.com/en-us/typography/opentype/spec/mvar#value-tags)
*
* Since: 2.6.0
**/
typedef enum {
HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER = HB_TAG ('h','a','s','c'),
HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER = HB_TAG ('h','d','s','c'),
HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP = HB_TAG ('h','l','g','p'),
HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT = HB_TAG ('h','c','l','a'),
HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT = HB_TAG ('h','c','l','d'),
HB_OT_METRICS_TAG_VERTICAL_ASCENDER = HB_TAG ('v','a','s','c'),
HB_OT_METRICS_TAG_VERTICAL_DESCENDER = HB_TAG ('v','d','s','c'),
HB_OT_METRICS_TAG_VERTICAL_LINE_GAP = HB_TAG ('v','l','g','p'),
HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE = HB_TAG ('h','c','r','s'),
HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN = HB_TAG ('h','c','r','n'),
HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET = HB_TAG ('h','c','o','f'),
HB_OT_METRICS_TAG_VERTICAL_CARET_RISE = HB_TAG ('v','c','r','s'),
HB_OT_METRICS_TAG_VERTICAL_CARET_RUN = HB_TAG ('v','c','r','n'),
HB_OT_METRICS_TAG_VERTICAL_CARET_OFFSET = HB_TAG ('v','c','o','f'),
HB_OT_METRICS_TAG_X_HEIGHT = HB_TAG ('x','h','g','t'),
HB_OT_METRICS_TAG_CAP_HEIGHT = HB_TAG ('c','p','h','t'),
HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE = HB_TAG ('s','b','x','s'),
HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE = HB_TAG ('s','b','y','s'),
HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET = HB_TAG ('s','b','x','o'),
HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET = HB_TAG ('s','b','y','o'),
HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE = HB_TAG ('s','p','x','s'),
HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE = HB_TAG ('s','p','y','s'),
HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET = HB_TAG ('s','p','x','o'),
HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET = HB_TAG ('s','p','y','o'),
HB_OT_METRICS_TAG_STRIKEOUT_SIZE = HB_TAG ('s','t','r','s'),
HB_OT_METRICS_TAG_STRIKEOUT_OFFSET = HB_TAG ('s','t','r','o'),
HB_OT_METRICS_TAG_UNDERLINE_SIZE = HB_TAG ('u','n','d','s'),
HB_OT_METRICS_TAG_UNDERLINE_OFFSET = HB_TAG ('u','n','d','o'),
/*< private >*/
_HB_OT_METRICS_TAG_MAX_VALUE = HB_TAG_MAX_SIGNED /*< skip >*/
} hb_ot_metrics_tag_t;
HB_EXTERN hb_bool_t
hb_ot_metrics_get_position (hb_font_t *font,
hb_ot_metrics_tag_t metrics_tag,
hb_position_t *position /* OUT. May be NULL. */);
HB_EXTERN float
hb_ot_metrics_get_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag);
HB_EXTERN hb_position_t
hb_ot_metrics_get_x_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag);
HB_EXTERN hb_position_t
hb_ot_metrics_get_y_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag);
HB_END_DECLS
#endif /* HB_OT_METRICS_H */