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Filename : hb-ot-math.h
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/*
 * Copyright © 2016  Igalia S.L.
 *
 *  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.
 *
 * Igalia Author(s): Frédéric Wang
 */

#ifndef HB_OT_H_IN
#error "Include <hb-ot.h> instead."
#endif

#ifndef HB_OT_MATH_H
#define HB_OT_MATH_H

#include "hb.h"

HB_BEGIN_DECLS


/*
 * MATH
 */

#define HB_OT_TAG_MATH HB_TAG('M','A','T','H')

/* Use with hb_buffer_set_script() for math shaping. */
#define HB_OT_MATH_SCRIPT HB_TAG('m','a','t','h')

/* Types */

/**
 * hb_ot_math_constant_t:
 *
 * The 'MATH' table constants specified at
 * https://docs.microsoft.com/en-us/typography/opentype/spec/math
 *
 * Since: 1.3.3
 */
typedef enum {
  HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN = 0,
  HB_OT_MATH_CONSTANT_SCRIPT_SCRIPT_PERCENT_SCALE_DOWN = 1,
  HB_OT_MATH_CONSTANT_DELIMITED_SUB_FORMULA_MIN_HEIGHT = 2,
  HB_OT_MATH_CONSTANT_DISPLAY_OPERATOR_MIN_HEIGHT = 3,
  HB_OT_MATH_CONSTANT_MATH_LEADING = 4,
  HB_OT_MATH_CONSTANT_AXIS_HEIGHT = 5,
  HB_OT_MATH_CONSTANT_ACCENT_BASE_HEIGHT = 6,
  HB_OT_MATH_CONSTANT_FLATTENED_ACCENT_BASE_HEIGHT = 7,
  HB_OT_MATH_CONSTANT_SUBSCRIPT_SHIFT_DOWN = 8,
  HB_OT_MATH_CONSTANT_SUBSCRIPT_TOP_MAX = 9,
  HB_OT_MATH_CONSTANT_SUBSCRIPT_BASELINE_DROP_MIN = 10,
  HB_OT_MATH_CONSTANT_SUPERSCRIPT_SHIFT_UP = 11,
  HB_OT_MATH_CONSTANT_SUPERSCRIPT_SHIFT_UP_CRAMPED = 12,
  HB_OT_MATH_CONSTANT_SUPERSCRIPT_BOTTOM_MIN = 13,
  HB_OT_MATH_CONSTANT_SUPERSCRIPT_BASELINE_DROP_MAX = 14,
  HB_OT_MATH_CONSTANT_SUB_SUPERSCRIPT_GAP_MIN = 15,
  HB_OT_MATH_CONSTANT_SUPERSCRIPT_BOTTOM_MAX_WITH_SUBSCRIPT = 16,
  HB_OT_MATH_CONSTANT_SPACE_AFTER_SCRIPT = 17,
  HB_OT_MATH_CONSTANT_UPPER_LIMIT_GAP_MIN = 18,
  HB_OT_MATH_CONSTANT_UPPER_LIMIT_BASELINE_RISE_MIN = 19,
  HB_OT_MATH_CONSTANT_LOWER_LIMIT_GAP_MIN = 20,
  HB_OT_MATH_CONSTANT_LOWER_LIMIT_BASELINE_DROP_MIN = 21,
  HB_OT_MATH_CONSTANT_STACK_TOP_SHIFT_UP = 22,
  HB_OT_MATH_CONSTANT_STACK_TOP_DISPLAY_STYLE_SHIFT_UP = 23,
  HB_OT_MATH_CONSTANT_STACK_BOTTOM_SHIFT_DOWN = 24,
  HB_OT_MATH_CONSTANT_STACK_BOTTOM_DISPLAY_STYLE_SHIFT_DOWN = 25,
  HB_OT_MATH_CONSTANT_STACK_GAP_MIN = 26,
  HB_OT_MATH_CONSTANT_STACK_DISPLAY_STYLE_GAP_MIN = 27,
  HB_OT_MATH_CONSTANT_STRETCH_STACK_TOP_SHIFT_UP = 28,
  HB_OT_MATH_CONSTANT_STRETCH_STACK_BOTTOM_SHIFT_DOWN = 29,
  HB_OT_MATH_CONSTANT_STRETCH_STACK_GAP_ABOVE_MIN = 30,
  HB_OT_MATH_CONSTANT_STRETCH_STACK_GAP_BELOW_MIN = 31,
  HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_SHIFT_UP = 32,
  HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_DISPLAY_STYLE_SHIFT_UP = 33,
  HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_SHIFT_DOWN = 34,
  HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_DISPLAY_STYLE_SHIFT_DOWN = 35,
  HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_GAP_MIN = 36,
  HB_OT_MATH_CONSTANT_FRACTION_NUM_DISPLAY_STYLE_GAP_MIN = 37,
  HB_OT_MATH_CONSTANT_FRACTION_RULE_THICKNESS = 38,
  HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_GAP_MIN = 39,
  HB_OT_MATH_CONSTANT_FRACTION_DENOM_DISPLAY_STYLE_GAP_MIN = 40,
  HB_OT_MATH_CONSTANT_SKEWED_FRACTION_HORIZONTAL_GAP = 41,
  HB_OT_MATH_CONSTANT_SKEWED_FRACTION_VERTICAL_GAP = 42,
  HB_OT_MATH_CONSTANT_OVERBAR_VERTICAL_GAP = 43,
  HB_OT_MATH_CONSTANT_OVERBAR_RULE_THICKNESS = 44,
  HB_OT_MATH_CONSTANT_OVERBAR_EXTRA_ASCENDER = 45,
  HB_OT_MATH_CONSTANT_UNDERBAR_VERTICAL_GAP = 46,
  HB_OT_MATH_CONSTANT_UNDERBAR_RULE_THICKNESS = 47,
  HB_OT_MATH_CONSTANT_UNDERBAR_EXTRA_DESCENDER = 48,
  HB_OT_MATH_CONSTANT_RADICAL_VERTICAL_GAP = 49,
  HB_OT_MATH_CONSTANT_RADICAL_DISPLAY_STYLE_VERTICAL_GAP = 50,
  HB_OT_MATH_CONSTANT_RADICAL_RULE_THICKNESS = 51,
  HB_OT_MATH_CONSTANT_RADICAL_EXTRA_ASCENDER = 52,
  HB_OT_MATH_CONSTANT_RADICAL_KERN_BEFORE_DEGREE = 53,
  HB_OT_MATH_CONSTANT_RADICAL_KERN_AFTER_DEGREE = 54,
  HB_OT_MATH_CONSTANT_RADICAL_DEGREE_BOTTOM_RAISE_PERCENT = 55
} hb_ot_math_constant_t;

/**
 * hb_ot_math_kern_t:
 *
 * The math kerning-table types defined for the four corners
 * of a glyph.
 *
 * Since: 1.3.3
 */
typedef enum {
  HB_OT_MATH_KERN_TOP_RIGHT = 0,
  HB_OT_MATH_KERN_TOP_LEFT = 1,
  HB_OT_MATH_KERN_BOTTOM_RIGHT = 2,
  HB_OT_MATH_KERN_BOTTOM_LEFT = 3
} hb_ot_math_kern_t;

/**
 * hb_ot_math_glyph_variant_t:
 * @glyph: The glyph index of the variant
 * @advance: The advance width of the variant
 *
 * Data type to hold math-variant information for a glyph.
 *
 * Since: 1.3.3
 */
typedef struct hb_ot_math_glyph_variant_t {
  hb_codepoint_t glyph;
  hb_position_t advance;
} hb_ot_math_glyph_variant_t;

/**
 * hb_ot_math_glyph_part_flags_t:
 *
 * Flags for math glyph parts.
 *
 * Since: 1.3.3
 */
typedef enum { /*< flags >*/
  HB_OT_MATH_GLYPH_PART_FLAG_EXTENDER	= 0x00000001u  /* Extender glyph */
} hb_ot_math_glyph_part_flags_t;

/**
 * hb_ot_math_glyph_part_t:
 * @glyph: The glyph index of the variant part
 * @start_connector_length: The length of the connector on the starting side of the variant part
 * @end_connector_length: The length of the connector on the ending side of the variant part
 * @full_advance: The total advance of the part
 * @flags: #hb_ot_math_glyph_part_flags_t flags for the part
 * 
 * Data type to hold information for a "part" component of a math-variant glyph.
 * Large variants for stretchable math glyphs (such as parentheses) can be constructed
 * on the fly from parts.
 *
 * Since: 1.3.3
 */
typedef struct hb_ot_math_glyph_part_t {
  hb_codepoint_t glyph;
  hb_position_t start_connector_length;
  hb_position_t end_connector_length;
  hb_position_t full_advance;
  hb_ot_math_glyph_part_flags_t flags;
} hb_ot_math_glyph_part_t;

/* Methods */

HB_EXTERN hb_bool_t
hb_ot_math_has_data (hb_face_t *face);

HB_EXTERN hb_position_t
hb_ot_math_get_constant (hb_font_t *font,
			 hb_ot_math_constant_t constant);

HB_EXTERN hb_position_t
hb_ot_math_get_glyph_italics_correction (hb_font_t *font,
					 hb_codepoint_t glyph);

HB_EXTERN hb_position_t
hb_ot_math_get_glyph_top_accent_attachment (hb_font_t *font,
					    hb_codepoint_t glyph);

HB_EXTERN hb_bool_t
hb_ot_math_is_glyph_extended_shape (hb_face_t *face,
				    hb_codepoint_t glyph);

HB_EXTERN hb_position_t
hb_ot_math_get_glyph_kerning (hb_font_t *font,
			      hb_codepoint_t glyph,
			      hb_ot_math_kern_t kern,
			      hb_position_t correction_height);

HB_EXTERN unsigned int
hb_ot_math_get_glyph_variants (hb_font_t *font,
			       hb_codepoint_t glyph,
			       hb_direction_t direction,
			       unsigned int start_offset,
			       unsigned int *variants_count, /* IN/OUT */
			       hb_ot_math_glyph_variant_t *variants /* OUT */);

HB_EXTERN hb_position_t
hb_ot_math_get_min_connector_overlap (hb_font_t *font,
				      hb_direction_t direction);

HB_EXTERN unsigned int
hb_ot_math_get_glyph_assembly (hb_font_t *font,
			       hb_codepoint_t glyph,
			       hb_direction_t direction,
			       unsigned int start_offset,
			       unsigned int *parts_count, /* IN/OUT */
			       hb_ot_math_glyph_part_t *parts, /* OUT */
			       hb_position_t *italics_correction /* OUT */);


HB_END_DECLS

#endif /* HB_OT_MATH_H */