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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 */