333 lines
13 KiB
C++
333 lines
13 KiB
C++
/*
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* Copyright © 2016 Igalia S.L.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Igalia Author(s): Frédéric Wang
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*/
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#if !defined(HB_OT_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
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#error "Include <hb-ot.h> instead."
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#endif
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#ifndef HB_OT_MATH_H
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#define HB_OT_MATH_H
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#include "hb.h"
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HB_BEGIN_DECLS
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/*
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* MATH
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*/
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/**
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* HB_OT_TAG_MATH:
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*
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* OpenType [Mathematical Typesetting Table](https://docs.microsoft.com/en-us/typography/opentype/spec/math).
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*
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* Since: 1.3.3
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*/
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#define HB_OT_TAG_MATH HB_TAG('M','A','T','H')
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/**
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* HB_OT_TAG_MATH_SCRIPT:
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*
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* OpenType script tag, `math`, for features specific to math shaping.
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*
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* <note>#HB_OT_TAG_MATH_SCRIPT is not a valid #hb_script_t and should only be
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* used with functions that accept raw OpenType script tags, such as
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* #hb_ot_layout_collect_features. In other cases, #HB_SCRIPT_MATH should be
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* used instead.</note>
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*
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* Since: 3.4.0
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*/
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#define HB_OT_TAG_MATH_SCRIPT HB_TAG('m','a','t','h')
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/* Types */
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/**
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* hb_ot_math_constant_t:
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* @HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN: scriptPercentScaleDown
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* @HB_OT_MATH_CONSTANT_SCRIPT_SCRIPT_PERCENT_SCALE_DOWN: scriptScriptPercentScaleDown
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* @HB_OT_MATH_CONSTANT_DELIMITED_SUB_FORMULA_MIN_HEIGHT: delimitedSubFormulaMinHeight
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* @HB_OT_MATH_CONSTANT_DISPLAY_OPERATOR_MIN_HEIGHT: displayOperatorMinHeight
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* @HB_OT_MATH_CONSTANT_MATH_LEADING: mathLeading
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* @HB_OT_MATH_CONSTANT_AXIS_HEIGHT: axisHeight
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* @HB_OT_MATH_CONSTANT_ACCENT_BASE_HEIGHT: accentBaseHeight
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* @HB_OT_MATH_CONSTANT_FLATTENED_ACCENT_BASE_HEIGHT: flattenedAccentBaseHeight
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* @HB_OT_MATH_CONSTANT_SUBSCRIPT_SHIFT_DOWN: subscriptShiftDown
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* @HB_OT_MATH_CONSTANT_SUBSCRIPT_TOP_MAX: subscriptTopMax
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* @HB_OT_MATH_CONSTANT_SUBSCRIPT_BASELINE_DROP_MIN: subscriptBaselineDropMin
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* @HB_OT_MATH_CONSTANT_SUPERSCRIPT_SHIFT_UP: superscriptShiftUp
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* @HB_OT_MATH_CONSTANT_SUPERSCRIPT_SHIFT_UP_CRAMPED: superscriptShiftUpCramped
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* @HB_OT_MATH_CONSTANT_SUPERSCRIPT_BOTTOM_MIN: superscriptBottomMin
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* @HB_OT_MATH_CONSTANT_SUPERSCRIPT_BASELINE_DROP_MAX: superscriptBaselineDropMax
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* @HB_OT_MATH_CONSTANT_SUB_SUPERSCRIPT_GAP_MIN: subSuperscriptGapMin
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* @HB_OT_MATH_CONSTANT_SUPERSCRIPT_BOTTOM_MAX_WITH_SUBSCRIPT: superscriptBottomMaxWithSubscript
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* @HB_OT_MATH_CONSTANT_SPACE_AFTER_SCRIPT: spaceAfterScript
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* @HB_OT_MATH_CONSTANT_UPPER_LIMIT_GAP_MIN: upperLimitGapMin
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* @HB_OT_MATH_CONSTANT_UPPER_LIMIT_BASELINE_RISE_MIN: upperLimitBaselineRiseMin
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* @HB_OT_MATH_CONSTANT_LOWER_LIMIT_GAP_MIN: lowerLimitGapMin
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* @HB_OT_MATH_CONSTANT_LOWER_LIMIT_BASELINE_DROP_MIN: lowerLimitBaselineDropMin
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* @HB_OT_MATH_CONSTANT_STACK_TOP_SHIFT_UP: stackTopShiftUp
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* @HB_OT_MATH_CONSTANT_STACK_TOP_DISPLAY_STYLE_SHIFT_UP: stackTopDisplayStyleShiftUp
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* @HB_OT_MATH_CONSTANT_STACK_BOTTOM_SHIFT_DOWN: stackBottomShiftDown
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* @HB_OT_MATH_CONSTANT_STACK_BOTTOM_DISPLAY_STYLE_SHIFT_DOWN: stackBottomDisplayStyleShiftDown
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* @HB_OT_MATH_CONSTANT_STACK_GAP_MIN: stackGapMin
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* @HB_OT_MATH_CONSTANT_STACK_DISPLAY_STYLE_GAP_MIN: stackDisplayStyleGapMin
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* @HB_OT_MATH_CONSTANT_STRETCH_STACK_TOP_SHIFT_UP: stretchStackTopShiftUp
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* @HB_OT_MATH_CONSTANT_STRETCH_STACK_BOTTOM_SHIFT_DOWN: stretchStackBottomShiftDown
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* @HB_OT_MATH_CONSTANT_STRETCH_STACK_GAP_ABOVE_MIN: stretchStackGapAboveMin
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* @HB_OT_MATH_CONSTANT_STRETCH_STACK_GAP_BELOW_MIN: stretchStackGapBelowMin
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* @HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_SHIFT_UP: fractionNumeratorShiftUp
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* @HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_DISPLAY_STYLE_SHIFT_UP: fractionNumeratorDisplayStyleShiftUp
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* @HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_SHIFT_DOWN: fractionDenominatorShiftDown
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* @HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_DISPLAY_STYLE_SHIFT_DOWN: fractionDenominatorDisplayStyleShiftDown
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* @HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_GAP_MIN: fractionNumeratorGapMin
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* @HB_OT_MATH_CONSTANT_FRACTION_NUM_DISPLAY_STYLE_GAP_MIN: fractionNumDisplayStyleGapMin
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* @HB_OT_MATH_CONSTANT_FRACTION_RULE_THICKNESS: fractionRuleThickness
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* @HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_GAP_MIN: fractionDenominatorGapMin
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* @HB_OT_MATH_CONSTANT_FRACTION_DENOM_DISPLAY_STYLE_GAP_MIN: fractionDenomDisplayStyleGapMin
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* @HB_OT_MATH_CONSTANT_SKEWED_FRACTION_HORIZONTAL_GAP: skewedFractionHorizontalGap
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* @HB_OT_MATH_CONSTANT_SKEWED_FRACTION_VERTICAL_GAP: skewedFractionVerticalGap
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* @HB_OT_MATH_CONSTANT_OVERBAR_VERTICAL_GAP: overbarVerticalGap
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* @HB_OT_MATH_CONSTANT_OVERBAR_RULE_THICKNESS: overbarRuleThickness
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* @HB_OT_MATH_CONSTANT_OVERBAR_EXTRA_ASCENDER: overbarExtraAscender
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* @HB_OT_MATH_CONSTANT_UNDERBAR_VERTICAL_GAP: underbarVerticalGap
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* @HB_OT_MATH_CONSTANT_UNDERBAR_RULE_THICKNESS: underbarRuleThickness
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* @HB_OT_MATH_CONSTANT_UNDERBAR_EXTRA_DESCENDER: underbarExtraDescender
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* @HB_OT_MATH_CONSTANT_RADICAL_VERTICAL_GAP: radicalVerticalGap
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* @HB_OT_MATH_CONSTANT_RADICAL_DISPLAY_STYLE_VERTICAL_GAP: radicalDisplayStyleVerticalGap
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* @HB_OT_MATH_CONSTANT_RADICAL_RULE_THICKNESS: radicalRuleThickness
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* @HB_OT_MATH_CONSTANT_RADICAL_EXTRA_ASCENDER: radicalExtraAscender
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* @HB_OT_MATH_CONSTANT_RADICAL_KERN_BEFORE_DEGREE: radicalKernBeforeDegree
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* @HB_OT_MATH_CONSTANT_RADICAL_KERN_AFTER_DEGREE: radicalKernAfterDegree
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* @HB_OT_MATH_CONSTANT_RADICAL_DEGREE_BOTTOM_RAISE_PERCENT: radicalDegreeBottomRaisePercent
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*
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* The 'MATH' table constants, refer to
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* [OpenType documentation](https://docs.microsoft.com/en-us/typography/opentype/spec/math#mathconstants-table)
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* For more explanations.
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*
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* Since: 1.3.3
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*/
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typedef enum {
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HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN = 0,
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HB_OT_MATH_CONSTANT_SCRIPT_SCRIPT_PERCENT_SCALE_DOWN = 1,
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HB_OT_MATH_CONSTANT_DELIMITED_SUB_FORMULA_MIN_HEIGHT = 2,
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HB_OT_MATH_CONSTANT_DISPLAY_OPERATOR_MIN_HEIGHT = 3,
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HB_OT_MATH_CONSTANT_MATH_LEADING = 4,
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HB_OT_MATH_CONSTANT_AXIS_HEIGHT = 5,
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HB_OT_MATH_CONSTANT_ACCENT_BASE_HEIGHT = 6,
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HB_OT_MATH_CONSTANT_FLATTENED_ACCENT_BASE_HEIGHT = 7,
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HB_OT_MATH_CONSTANT_SUBSCRIPT_SHIFT_DOWN = 8,
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HB_OT_MATH_CONSTANT_SUBSCRIPT_TOP_MAX = 9,
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HB_OT_MATH_CONSTANT_SUBSCRIPT_BASELINE_DROP_MIN = 10,
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HB_OT_MATH_CONSTANT_SUPERSCRIPT_SHIFT_UP = 11,
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HB_OT_MATH_CONSTANT_SUPERSCRIPT_SHIFT_UP_CRAMPED = 12,
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HB_OT_MATH_CONSTANT_SUPERSCRIPT_BOTTOM_MIN = 13,
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HB_OT_MATH_CONSTANT_SUPERSCRIPT_BASELINE_DROP_MAX = 14,
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HB_OT_MATH_CONSTANT_SUB_SUPERSCRIPT_GAP_MIN = 15,
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HB_OT_MATH_CONSTANT_SUPERSCRIPT_BOTTOM_MAX_WITH_SUBSCRIPT = 16,
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HB_OT_MATH_CONSTANT_SPACE_AFTER_SCRIPT = 17,
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HB_OT_MATH_CONSTANT_UPPER_LIMIT_GAP_MIN = 18,
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HB_OT_MATH_CONSTANT_UPPER_LIMIT_BASELINE_RISE_MIN = 19,
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HB_OT_MATH_CONSTANT_LOWER_LIMIT_GAP_MIN = 20,
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HB_OT_MATH_CONSTANT_LOWER_LIMIT_BASELINE_DROP_MIN = 21,
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HB_OT_MATH_CONSTANT_STACK_TOP_SHIFT_UP = 22,
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HB_OT_MATH_CONSTANT_STACK_TOP_DISPLAY_STYLE_SHIFT_UP = 23,
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HB_OT_MATH_CONSTANT_STACK_BOTTOM_SHIFT_DOWN = 24,
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HB_OT_MATH_CONSTANT_STACK_BOTTOM_DISPLAY_STYLE_SHIFT_DOWN = 25,
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HB_OT_MATH_CONSTANT_STACK_GAP_MIN = 26,
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HB_OT_MATH_CONSTANT_STACK_DISPLAY_STYLE_GAP_MIN = 27,
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HB_OT_MATH_CONSTANT_STRETCH_STACK_TOP_SHIFT_UP = 28,
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HB_OT_MATH_CONSTANT_STRETCH_STACK_BOTTOM_SHIFT_DOWN = 29,
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HB_OT_MATH_CONSTANT_STRETCH_STACK_GAP_ABOVE_MIN = 30,
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HB_OT_MATH_CONSTANT_STRETCH_STACK_GAP_BELOW_MIN = 31,
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HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_SHIFT_UP = 32,
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HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_DISPLAY_STYLE_SHIFT_UP = 33,
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HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_SHIFT_DOWN = 34,
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HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_DISPLAY_STYLE_SHIFT_DOWN = 35,
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HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_GAP_MIN = 36,
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HB_OT_MATH_CONSTANT_FRACTION_NUM_DISPLAY_STYLE_GAP_MIN = 37,
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HB_OT_MATH_CONSTANT_FRACTION_RULE_THICKNESS = 38,
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HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_GAP_MIN = 39,
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HB_OT_MATH_CONSTANT_FRACTION_DENOM_DISPLAY_STYLE_GAP_MIN = 40,
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HB_OT_MATH_CONSTANT_SKEWED_FRACTION_HORIZONTAL_GAP = 41,
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HB_OT_MATH_CONSTANT_SKEWED_FRACTION_VERTICAL_GAP = 42,
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HB_OT_MATH_CONSTANT_OVERBAR_VERTICAL_GAP = 43,
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HB_OT_MATH_CONSTANT_OVERBAR_RULE_THICKNESS = 44,
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HB_OT_MATH_CONSTANT_OVERBAR_EXTRA_ASCENDER = 45,
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HB_OT_MATH_CONSTANT_UNDERBAR_VERTICAL_GAP = 46,
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HB_OT_MATH_CONSTANT_UNDERBAR_RULE_THICKNESS = 47,
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HB_OT_MATH_CONSTANT_UNDERBAR_EXTRA_DESCENDER = 48,
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HB_OT_MATH_CONSTANT_RADICAL_VERTICAL_GAP = 49,
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HB_OT_MATH_CONSTANT_RADICAL_DISPLAY_STYLE_VERTICAL_GAP = 50,
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HB_OT_MATH_CONSTANT_RADICAL_RULE_THICKNESS = 51,
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HB_OT_MATH_CONSTANT_RADICAL_EXTRA_ASCENDER = 52,
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HB_OT_MATH_CONSTANT_RADICAL_KERN_BEFORE_DEGREE = 53,
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HB_OT_MATH_CONSTANT_RADICAL_KERN_AFTER_DEGREE = 54,
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HB_OT_MATH_CONSTANT_RADICAL_DEGREE_BOTTOM_RAISE_PERCENT = 55
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} hb_ot_math_constant_t;
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/**
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* hb_ot_math_kern_t:
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* @HB_OT_MATH_KERN_TOP_RIGHT: The top right corner of the glyph.
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* @HB_OT_MATH_KERN_TOP_LEFT: The top left corner of the glyph.
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* @HB_OT_MATH_KERN_BOTTOM_RIGHT: The bottom right corner of the glyph.
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* @HB_OT_MATH_KERN_BOTTOM_LEFT: The bottom left corner of the glyph.
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*
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* The math kerning-table types defined for the four corners
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* of a glyph.
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*
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* Since: 1.3.3
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*/
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typedef enum {
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HB_OT_MATH_KERN_TOP_RIGHT = 0,
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HB_OT_MATH_KERN_TOP_LEFT = 1,
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HB_OT_MATH_KERN_BOTTOM_RIGHT = 2,
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HB_OT_MATH_KERN_BOTTOM_LEFT = 3
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} hb_ot_math_kern_t;
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/**
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* hb_ot_math_kern_entry_t:
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* @max_correction_height: The maximum height at which this entry should be used
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* @kern_value: The kern value of the entry
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*
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* Data type to hold math kerning (cut-in) information for a glyph.
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*
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* Since: 3.4.0
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*/
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typedef struct {
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hb_position_t max_correction_height;
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hb_position_t kern_value;
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} hb_ot_math_kern_entry_t;
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/**
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* hb_ot_math_glyph_variant_t:
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* @glyph: The glyph index of the variant
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* @advance: The advance width of the variant
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*
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* Data type to hold math-variant information for a glyph.
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*
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* Since: 1.3.3
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*/
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typedef struct hb_ot_math_glyph_variant_t {
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hb_codepoint_t glyph;
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hb_position_t advance;
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} hb_ot_math_glyph_variant_t;
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/**
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* hb_ot_math_glyph_part_flags_t:
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* @HB_OT_MATH_GLYPH_PART_FLAG_EXTENDER: This is an extender glyph part that
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* can be repeated to reach the desired length.
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*
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* Flags for math glyph parts.
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*
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* Since: 1.3.3
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*/
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typedef enum { /*< flags >*/
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HB_OT_MATH_GLYPH_PART_FLAG_EXTENDER = 0x00000001u /* Extender glyph */
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} hb_ot_math_glyph_part_flags_t;
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/**
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* hb_ot_math_glyph_part_t:
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* @glyph: The glyph index of the variant part
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* @start_connector_length: The length of the connector on the starting side of the variant part
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* @end_connector_length: The length of the connector on the ending side of the variant part
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* @full_advance: The total advance of the part
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* @flags: #hb_ot_math_glyph_part_flags_t flags for the part
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*
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* Data type to hold information for a "part" component of a math-variant glyph.
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* Large variants for stretchable math glyphs (such as parentheses) can be constructed
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* on the fly from parts.
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*
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* Since: 1.3.3
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*/
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typedef struct hb_ot_math_glyph_part_t {
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hb_codepoint_t glyph;
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hb_position_t start_connector_length;
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hb_position_t end_connector_length;
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hb_position_t full_advance;
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hb_ot_math_glyph_part_flags_t flags;
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} hb_ot_math_glyph_part_t;
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/* Methods */
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HB_EXTERN hb_bool_t
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hb_ot_math_has_data (hb_face_t *face);
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HB_EXTERN hb_position_t
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hb_ot_math_get_constant (hb_font_t *font,
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hb_ot_math_constant_t constant);
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HB_EXTERN hb_position_t
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hb_ot_math_get_glyph_italics_correction (hb_font_t *font,
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hb_codepoint_t glyph);
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HB_EXTERN hb_position_t
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hb_ot_math_get_glyph_top_accent_attachment (hb_font_t *font,
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hb_codepoint_t glyph);
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HB_EXTERN hb_bool_t
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hb_ot_math_is_glyph_extended_shape (hb_face_t *face,
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hb_codepoint_t glyph);
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HB_EXTERN hb_position_t
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hb_ot_math_get_glyph_kerning (hb_font_t *font,
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hb_codepoint_t glyph,
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hb_ot_math_kern_t kern,
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hb_position_t correction_height);
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HB_EXTERN unsigned int
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hb_ot_math_get_glyph_kernings (hb_font_t *font,
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hb_codepoint_t glyph,
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hb_ot_math_kern_t kern,
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unsigned int start_offset,
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unsigned int *entries_count, /* IN/OUT */
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hb_ot_math_kern_entry_t *kern_entries /* OUT */);
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HB_EXTERN unsigned int
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hb_ot_math_get_glyph_variants (hb_font_t *font,
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hb_codepoint_t glyph,
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hb_direction_t direction,
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unsigned int start_offset,
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unsigned int *variants_count, /* IN/OUT */
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hb_ot_math_glyph_variant_t *variants /* OUT */);
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HB_EXTERN hb_position_t
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hb_ot_math_get_min_connector_overlap (hb_font_t *font,
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hb_direction_t direction);
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HB_EXTERN unsigned int
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hb_ot_math_get_glyph_assembly (hb_font_t *font,
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hb_codepoint_t glyph,
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hb_direction_t direction,
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unsigned int start_offset,
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unsigned int *parts_count, /* IN/OUT */
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hb_ot_math_glyph_part_t *parts, /* OUT */
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hb_position_t *italics_correction /* OUT */);
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HB_END_DECLS
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#endif /* HB_OT_MATH_H */
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