| /* |
| * 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_MATH_TABLE_HH |
| #define HB_OT_MATH_TABLE_HH |
| |
| #include "hb-open-type.hh" |
| #include "hb-ot-layout-common.hh" |
| #include "hb-ot-math.h" |
| |
| namespace OT { |
| |
| |
| struct MathValueRecord |
| { |
| hb_position_t get_x_value (hb_font_t *font, const void *base) const |
| { return font->em_scale_x (value) + (base+deviceTable).get_x_delta (font); } |
| hb_position_t get_y_value (hb_font_t *font, const void *base) const |
| { return font->em_scale_y (value) + (base+deviceTable).get_y_delta (font); } |
| |
| bool sanitize (hb_sanitize_context_t *c, const void *base) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && deviceTable.sanitize (c, base)); |
| } |
| |
| protected: |
| HBINT16 value; /* The X or Y value in design units */ |
| OffsetTo<Device> deviceTable; /* Offset to the device table - from the |
| * beginning of parent table. May be NULL. |
| * Suggested format for device table is 1. */ |
| |
| public: |
| DEFINE_SIZE_STATIC (4); |
| }; |
| |
| struct MathConstants |
| { |
| bool sanitize_math_value_records (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| |
| unsigned int count = ARRAY_LENGTH (mathValueRecords); |
| for (unsigned int i = 0; i < count; i++) |
| if (!mathValueRecords[i].sanitize (c, this)) |
| return_trace (false); |
| |
| return_trace (true); |
| } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && sanitize_math_value_records (c)); |
| } |
| |
| hb_position_t get_value (hb_ot_math_constant_t constant, |
| hb_font_t *font) const |
| { |
| switch (constant) { |
| |
| case HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN: |
| case HB_OT_MATH_CONSTANT_SCRIPT_SCRIPT_PERCENT_SCALE_DOWN: |
| return percentScaleDown[constant - HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN]; |
| |
| case HB_OT_MATH_CONSTANT_DELIMITED_SUB_FORMULA_MIN_HEIGHT: |
| case HB_OT_MATH_CONSTANT_DISPLAY_OPERATOR_MIN_HEIGHT: |
| return font->em_scale_y (minHeight[constant - HB_OT_MATH_CONSTANT_DELIMITED_SUB_FORMULA_MIN_HEIGHT]); |
| |
| case HB_OT_MATH_CONSTANT_RADICAL_KERN_AFTER_DEGREE: |
| case HB_OT_MATH_CONSTANT_RADICAL_KERN_BEFORE_DEGREE: |
| case HB_OT_MATH_CONSTANT_SKEWED_FRACTION_HORIZONTAL_GAP: |
| case HB_OT_MATH_CONSTANT_SPACE_AFTER_SCRIPT: |
| return mathValueRecords[constant - HB_OT_MATH_CONSTANT_MATH_LEADING].get_x_value (font, this); |
| |
| case HB_OT_MATH_CONSTANT_ACCENT_BASE_HEIGHT: |
| case HB_OT_MATH_CONSTANT_AXIS_HEIGHT: |
| case HB_OT_MATH_CONSTANT_FLATTENED_ACCENT_BASE_HEIGHT: |
| case HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_DISPLAY_STYLE_SHIFT_DOWN: |
| case HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_GAP_MIN: |
| case HB_OT_MATH_CONSTANT_FRACTION_DENOMINATOR_SHIFT_DOWN: |
| case HB_OT_MATH_CONSTANT_FRACTION_DENOM_DISPLAY_STYLE_GAP_MIN: |
| case HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_DISPLAY_STYLE_SHIFT_UP: |
| case HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_GAP_MIN: |
| case HB_OT_MATH_CONSTANT_FRACTION_NUMERATOR_SHIFT_UP: |
| case HB_OT_MATH_CONSTANT_FRACTION_NUM_DISPLAY_STYLE_GAP_MIN: |
| case HB_OT_MATH_CONSTANT_FRACTION_RULE_THICKNESS: |
| case HB_OT_MATH_CONSTANT_LOWER_LIMIT_BASELINE_DROP_MIN: |
| case HB_OT_MATH_CONSTANT_LOWER_LIMIT_GAP_MIN: |
| case HB_OT_MATH_CONSTANT_MATH_LEADING: |
| case HB_OT_MATH_CONSTANT_OVERBAR_EXTRA_ASCENDER: |
| case HB_OT_MATH_CONSTANT_OVERBAR_RULE_THICKNESS: |
| case HB_OT_MATH_CONSTANT_OVERBAR_VERTICAL_GAP: |
| case HB_OT_MATH_CONSTANT_RADICAL_DISPLAY_STYLE_VERTICAL_GAP: |
| case HB_OT_MATH_CONSTANT_RADICAL_EXTRA_ASCENDER: |
| case HB_OT_MATH_CONSTANT_RADICAL_RULE_THICKNESS: |
| case HB_OT_MATH_CONSTANT_RADICAL_VERTICAL_GAP: |
| case HB_OT_MATH_CONSTANT_SKEWED_FRACTION_VERTICAL_GAP: |
| case HB_OT_MATH_CONSTANT_STACK_BOTTOM_DISPLAY_STYLE_SHIFT_DOWN: |
| case HB_OT_MATH_CONSTANT_STACK_BOTTOM_SHIFT_DOWN: |
| case HB_OT_MATH_CONSTANT_STACK_DISPLAY_STYLE_GAP_MIN: |
| case HB_OT_MATH_CONSTANT_STACK_GAP_MIN: |
| case HB_OT_MATH_CONSTANT_STACK_TOP_DISPLAY_STYLE_SHIFT_UP: |
| case HB_OT_MATH_CONSTANT_STACK_TOP_SHIFT_UP: |
| case HB_OT_MATH_CONSTANT_STRETCH_STACK_BOTTOM_SHIFT_DOWN: |
| case HB_OT_MATH_CONSTANT_STRETCH_STACK_GAP_ABOVE_MIN: |
| case HB_OT_MATH_CONSTANT_STRETCH_STACK_GAP_BELOW_MIN: |
| case HB_OT_MATH_CONSTANT_STRETCH_STACK_TOP_SHIFT_UP: |
| case HB_OT_MATH_CONSTANT_SUBSCRIPT_BASELINE_DROP_MIN: |
| case HB_OT_MATH_CONSTANT_SUBSCRIPT_SHIFT_DOWN: |
| case HB_OT_MATH_CONSTANT_SUBSCRIPT_TOP_MAX: |
| case HB_OT_MATH_CONSTANT_SUB_SUPERSCRIPT_GAP_MIN: |
| case HB_OT_MATH_CONSTANT_SUPERSCRIPT_BASELINE_DROP_MAX: |
| case HB_OT_MATH_CONSTANT_SUPERSCRIPT_BOTTOM_MAX_WITH_SUBSCRIPT: |
| case HB_OT_MATH_CONSTANT_SUPERSCRIPT_BOTTOM_MIN: |
| case HB_OT_MATH_CONSTANT_SUPERSCRIPT_SHIFT_UP: |
| case HB_OT_MATH_CONSTANT_SUPERSCRIPT_SHIFT_UP_CRAMPED: |
| case HB_OT_MATH_CONSTANT_UNDERBAR_EXTRA_DESCENDER: |
| case HB_OT_MATH_CONSTANT_UNDERBAR_RULE_THICKNESS: |
| case HB_OT_MATH_CONSTANT_UNDERBAR_VERTICAL_GAP: |
| case HB_OT_MATH_CONSTANT_UPPER_LIMIT_BASELINE_RISE_MIN: |
| case HB_OT_MATH_CONSTANT_UPPER_LIMIT_GAP_MIN: |
| return mathValueRecords[constant - HB_OT_MATH_CONSTANT_MATH_LEADING].get_y_value (font, this); |
| |
| case HB_OT_MATH_CONSTANT_RADICAL_DEGREE_BOTTOM_RAISE_PERCENT: |
| return radicalDegreeBottomRaisePercent; |
| |
| default: |
| return 0; |
| } |
| } |
| |
| protected: |
| HBINT16 percentScaleDown[2]; |
| HBUINT16 minHeight[2]; |
| MathValueRecord mathValueRecords[51]; |
| HBINT16 radicalDegreeBottomRaisePercent; |
| |
| public: |
| DEFINE_SIZE_STATIC (214); |
| }; |
| |
| struct MathItalicsCorrectionInfo |
| { |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && |
| coverage.sanitize (c, this) && |
| italicsCorrection.sanitize (c, this)); |
| } |
| |
| hb_position_t get_value (hb_codepoint_t glyph, |
| hb_font_t *font) const |
| { |
| unsigned int index = (this+coverage).get_coverage (glyph); |
| return italicsCorrection[index].get_x_value (font, this); |
| } |
| |
| protected: |
| OffsetTo<Coverage> coverage; /* Offset to Coverage table - |
| * from the beginning of |
| * MathItalicsCorrectionInfo |
| * table. */ |
| ArrayOf<MathValueRecord> italicsCorrection; /* Array of MathValueRecords |
| * defining italics correction |
| * values for each |
| * covered glyph. */ |
| |
| public: |
| DEFINE_SIZE_ARRAY (4, italicsCorrection); |
| }; |
| |
| struct MathTopAccentAttachment |
| { |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && |
| topAccentCoverage.sanitize (c, this) && |
| topAccentAttachment.sanitize (c, this)); |
| } |
| |
| hb_position_t get_value (hb_codepoint_t glyph, |
| hb_font_t *font) const |
| { |
| unsigned int index = (this+topAccentCoverage).get_coverage (glyph); |
| if (index == NOT_COVERED) |
| return font->get_glyph_h_advance (glyph) / 2; |
| return topAccentAttachment[index].get_x_value (font, this); |
| } |
| |
| protected: |
| OffsetTo<Coverage> topAccentCoverage; /* Offset to Coverage table - |
| * from the beginning of |
| * MathTopAccentAttachment |
| * table. */ |
| ArrayOf<MathValueRecord> topAccentAttachment; /* Array of MathValueRecords |
| * defining top accent |
| * attachment points for each |
| * covered glyph. */ |
| |
| public: |
| DEFINE_SIZE_ARRAY (2 + 2, topAccentAttachment); |
| }; |
| |
| struct MathKern |
| { |
| bool sanitize_math_value_records (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| unsigned int count = 2 * heightCount + 1; |
| for (unsigned int i = 0; i < count; i++) |
| if (!mathValueRecordsZ.arrayZ[i].sanitize (c, this)) return_trace (false); |
| return_trace (true); |
| } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && |
| c->check_array (mathValueRecordsZ.arrayZ, 2 * heightCount + 1) && |
| sanitize_math_value_records (c)); |
| } |
| |
| hb_position_t get_value (hb_position_t correction_height, hb_font_t *font) const |
| { |
| const MathValueRecord* correctionHeight = mathValueRecordsZ.arrayZ; |
| const MathValueRecord* kernValue = mathValueRecordsZ.arrayZ + heightCount; |
| int sign = font->y_scale < 0 ? -1 : +1; |
| |
| /* The description of the MathKern table is a ambiguous, but interpreting |
| * "between the two heights found at those indexes" for 0 < i < len as |
| * |
| * correctionHeight[i-1] < correction_height <= correctionHeight[i] |
| * |
| * makes the result consistent with the limit cases and we can just use the |
| * binary search algorithm of std::upper_bound: |
| */ |
| unsigned int i = 0; |
| unsigned int count = heightCount; |
| while (count > 0) |
| { |
| unsigned int half = count / 2; |
| hb_position_t height = correctionHeight[i + half].get_y_value (font, this); |
| if (sign * height < sign * correction_height) |
| { |
| i += half + 1; |
| count -= half + 1; |
| } else |
| count = half; |
| } |
| return kernValue[i].get_x_value (font, this); |
| } |
| |
| protected: |
| HBUINT16 heightCount; |
| UnsizedArrayOf<MathValueRecord> |
| mathValueRecordsZ; /* Array of correction heights at |
| * which the kern value changes. |
| * Sorted by the height value in |
| * design units (heightCount entries), |
| * Followed by: |
| * Array of kern values corresponding |
| * to heights. (heightCount+1 entries). |
| */ |
| |
| public: |
| DEFINE_SIZE_ARRAY (2, mathValueRecordsZ); |
| }; |
| |
| struct MathKernInfoRecord |
| { |
| bool sanitize (hb_sanitize_context_t *c, const void *base) const |
| { |
| TRACE_SANITIZE (this); |
| |
| unsigned int count = ARRAY_LENGTH (mathKern); |
| for (unsigned int i = 0; i < count; i++) |
| if (unlikely (!mathKern[i].sanitize (c, base))) |
| return_trace (false); |
| |
| return_trace (true); |
| } |
| |
| hb_position_t get_kerning (hb_ot_math_kern_t kern, |
| hb_position_t correction_height, |
| hb_font_t *font, |
| const void *base) const |
| { |
| unsigned int idx = kern; |
| if (unlikely (idx >= ARRAY_LENGTH (mathKern))) return 0; |
| return (base+mathKern[idx]).get_value (correction_height, font); |
| } |
| |
| protected: |
| /* Offset to MathKern table for each corner - |
| * from the beginning of MathKernInfo table. May be NULL. */ |
| OffsetTo<MathKern> mathKern[4]; |
| |
| public: |
| DEFINE_SIZE_STATIC (8); |
| }; |
| |
| struct MathKernInfo |
| { |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && |
| mathKernCoverage.sanitize (c, this) && |
| mathKernInfoRecords.sanitize (c, this)); |
| } |
| |
| hb_position_t get_kerning (hb_codepoint_t glyph, |
| hb_ot_math_kern_t kern, |
| hb_position_t correction_height, |
| hb_font_t *font) const |
| { |
| unsigned int index = (this+mathKernCoverage).get_coverage (glyph); |
| return mathKernInfoRecords[index].get_kerning (kern, correction_height, font, this); |
| } |
| |
| protected: |
| OffsetTo<Coverage> mathKernCoverage; /* Offset to Coverage table - |
| * from the beginning of the |
| * MathKernInfo table. */ |
| ArrayOf<MathKernInfoRecord> mathKernInfoRecords; /* Array of |
| * MathKernInfoRecords, |
| * per-glyph information for |
| * mathematical positioning |
| * of subscripts and |
| * superscripts. */ |
| |
| public: |
| DEFINE_SIZE_ARRAY (4, mathKernInfoRecords); |
| }; |
| |
| struct MathGlyphInfo |
| { |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && |
| mathItalicsCorrectionInfo.sanitize (c, this) && |
| mathTopAccentAttachment.sanitize (c, this) && |
| extendedShapeCoverage.sanitize (c, this) && |
| mathKernInfo.sanitize (c, this)); |
| } |
| |
| hb_position_t |
| get_italics_correction (hb_codepoint_t glyph, hb_font_t *font) const |
| { return (this+mathItalicsCorrectionInfo).get_value (glyph, font); } |
| |
| hb_position_t |
| get_top_accent_attachment (hb_codepoint_t glyph, hb_font_t *font) const |
| { return (this+mathTopAccentAttachment).get_value (glyph, font); } |
| |
| bool is_extended_shape (hb_codepoint_t glyph) const |
| { return (this+extendedShapeCoverage).get_coverage (glyph) != NOT_COVERED; } |
| |
| hb_position_t get_kerning (hb_codepoint_t glyph, |
| hb_ot_math_kern_t kern, |
| hb_position_t correction_height, |
| hb_font_t *font) const |
| { return (this+mathKernInfo).get_kerning (glyph, kern, correction_height, font); } |
| |
| protected: |
| /* Offset to MathItalicsCorrectionInfo table - |
| * from the beginning of MathGlyphInfo table. */ |
| OffsetTo<MathItalicsCorrectionInfo> mathItalicsCorrectionInfo; |
| |
| /* Offset to MathTopAccentAttachment table - |
| * from the beginning of MathGlyphInfo table. */ |
| OffsetTo<MathTopAccentAttachment> mathTopAccentAttachment; |
| |
| /* Offset to coverage table for Extended Shape glyphs - |
| * from the beginning of MathGlyphInfo table. When the left or right glyph of |
| * a box is an extended shape variant, the (ink) box (and not the default |
| * position defined by values in MathConstants table) should be used for |
| * vertical positioning purposes. May be NULL.. */ |
| OffsetTo<Coverage> extendedShapeCoverage; |
| |
| /* Offset to MathKernInfo table - |
| * from the beginning of MathGlyphInfo table. */ |
| OffsetTo<MathKernInfo> mathKernInfo; |
| |
| public: |
| DEFINE_SIZE_STATIC (8); |
| }; |
| |
| struct MathGlyphVariantRecord |
| { |
| friend struct MathGlyphConstruction; |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this)); |
| } |
| |
| protected: |
| GlyphID variantGlyph; /* Glyph ID for the variant. */ |
| HBUINT16 advanceMeasurement; /* Advance width/height, in design units, of the |
| * variant, in the direction of requested |
| * glyph extension. */ |
| |
| public: |
| DEFINE_SIZE_STATIC (4); |
| }; |
| |
| struct PartFlags : HBUINT16 |
| { |
| enum Flags { |
| Extender = 0x0001u, /* If set, the part can be skipped or repeated. */ |
| |
| Defined = 0x0001u, /* All defined flags. */ |
| }; |
| |
| public: |
| DEFINE_SIZE_STATIC (2); |
| }; |
| |
| struct MathGlyphPartRecord |
| { |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this)); |
| } |
| |
| void extract (hb_ot_math_glyph_part_t &out, |
| int scale, |
| hb_font_t *font) const |
| { |
| out.glyph = glyph; |
| |
| out.start_connector_length = font->em_scale (startConnectorLength, scale); |
| out.end_connector_length = font->em_scale (endConnectorLength, scale); |
| out.full_advance = font->em_scale (fullAdvance, scale); |
| |
| static_assert ((unsigned int) HB_MATH_GLYPH_PART_FLAG_EXTENDER == |
| (unsigned int) PartFlags::Extender, ""); |
| |
| out.flags = (hb_ot_math_glyph_part_flags_t) |
| (unsigned int) |
| (partFlags & PartFlags::Defined); |
| } |
| |
| protected: |
| GlyphID glyph; /* Glyph ID for the part. */ |
| HBUINT16 startConnectorLength; /* Advance width/ height of the straight bar |
| * connector material, in design units, is at |
| * the beginning of the glyph, in the |
| * direction of the extension. */ |
| HBUINT16 endConnectorLength; /* Advance width/ height of the straight bar |
| * connector material, in design units, is at |
| * the end of the glyph, in the direction of |
| * the extension. */ |
| HBUINT16 fullAdvance; /* Full advance width/height for this part, |
| * in the direction of the extension. |
| * In design units. */ |
| PartFlags partFlags; /* Part qualifiers. */ |
| |
| public: |
| DEFINE_SIZE_STATIC (10); |
| }; |
| |
| struct MathGlyphAssembly |
| { |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && |
| italicsCorrection.sanitize (c, this) && |
| partRecords.sanitize (c)); |
| } |
| |
| unsigned int get_parts (hb_direction_t direction, |
| hb_font_t *font, |
| unsigned int start_offset, |
| unsigned int *parts_count, /* IN/OUT */ |
| hb_ot_math_glyph_part_t *parts /* OUT */, |
| hb_position_t *italics_correction /* OUT */) const |
| { |
| if (parts_count) |
| { |
| int scale = font->dir_scale (direction); |
| hb_array_t<const MathGlyphPartRecord> arr = partRecords.sub_array (start_offset, parts_count); |
| unsigned int count = arr.length; |
| for (unsigned int i = 0; i < count; i++) |
| arr[i].extract (parts[i], scale, font); |
| } |
| |
| if (italics_correction) |
| *italics_correction = italicsCorrection.get_x_value (font, this); |
| |
| return partRecords.len; |
| } |
| |
| protected: |
| MathValueRecord italicsCorrection; /* Italics correction of this |
| * MathGlyphAssembly. Should not |
| * depend on the assembly size. */ |
| ArrayOf<MathGlyphPartRecord> partRecords; /* Array of part records, from |
| * left to right and bottom to |
| * top. */ |
| |
| public: |
| DEFINE_SIZE_ARRAY (6, partRecords); |
| }; |
| |
| struct MathGlyphConstruction |
| { |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && |
| glyphAssembly.sanitize (c, this) && |
| mathGlyphVariantRecord.sanitize (c)); |
| } |
| |
| const MathGlyphAssembly &get_assembly () const { return this+glyphAssembly; } |
| |
| unsigned int get_variants (hb_direction_t direction, |
| hb_font_t *font, |
| unsigned int start_offset, |
| unsigned int *variants_count, /* IN/OUT */ |
| hb_ot_math_glyph_variant_t *variants /* OUT */) const |
| { |
| if (variants_count) |
| { |
| int scale = font->dir_scale (direction); |
| hb_array_t<const MathGlyphVariantRecord> arr = mathGlyphVariantRecord.sub_array (start_offset, variants_count); |
| unsigned int count = arr.length; |
| for (unsigned int i = 0; i < count; i++) |
| { |
| variants[i].glyph = arr[i].variantGlyph; |
| variants[i].advance = font->em_scale (arr[i].advanceMeasurement, scale); |
| } |
| } |
| return mathGlyphVariantRecord.len; |
| } |
| |
| protected: |
| /* Offset to MathGlyphAssembly table for this shape - from the beginning of |
| MathGlyphConstruction table. May be NULL. */ |
| OffsetTo<MathGlyphAssembly> glyphAssembly; |
| |
| /* MathGlyphVariantRecords for alternative variants of the glyphs. */ |
| ArrayOf<MathGlyphVariantRecord> mathGlyphVariantRecord; |
| |
| public: |
| DEFINE_SIZE_ARRAY (4, mathGlyphVariantRecord); |
| }; |
| |
| struct MathVariants |
| { |
| bool sanitize_offsets (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| unsigned int count = vertGlyphCount + horizGlyphCount; |
| for (unsigned int i = 0; i < count; i++) |
| if (!glyphConstruction.arrayZ[i].sanitize (c, this)) return_trace (false); |
| return_trace (true); |
| } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && |
| vertGlyphCoverage.sanitize (c, this) && |
| horizGlyphCoverage.sanitize (c, this) && |
| c->check_array (glyphConstruction.arrayZ, vertGlyphCount + horizGlyphCount) && |
| sanitize_offsets (c)); |
| } |
| |
| hb_position_t get_min_connector_overlap (hb_direction_t direction, |
| hb_font_t *font) const |
| { return font->em_scale_dir (minConnectorOverlap, direction); } |
| |
| unsigned int get_glyph_variants (hb_codepoint_t glyph, |
| hb_direction_t direction, |
| hb_font_t *font, |
| unsigned int start_offset, |
| unsigned int *variants_count, /* IN/OUT */ |
| hb_ot_math_glyph_variant_t *variants /* OUT */) const |
| { return get_glyph_construction (glyph, direction, font) |
| .get_variants (direction, font, start_offset, variants_count, variants); } |
| |
| unsigned int get_glyph_parts (hb_codepoint_t glyph, |
| hb_direction_t direction, |
| hb_font_t *font, |
| unsigned int start_offset, |
| unsigned int *parts_count, /* IN/OUT */ |
| hb_ot_math_glyph_part_t *parts /* OUT */, |
| hb_position_t *italics_correction /* OUT */) const |
| { return get_glyph_construction (glyph, direction, font) |
| .get_assembly () |
| .get_parts (direction, font, |
| start_offset, parts_count, parts, |
| italics_correction); } |
| |
| private: |
| const MathGlyphConstruction & |
| get_glyph_construction (hb_codepoint_t glyph, |
| hb_direction_t direction, |
| hb_font_t *font HB_UNUSED) const |
| { |
| bool vertical = HB_DIRECTION_IS_VERTICAL (direction); |
| unsigned int count = vertical ? vertGlyphCount : horizGlyphCount; |
| const OffsetTo<Coverage> &coverage = vertical ? vertGlyphCoverage |
| : horizGlyphCoverage; |
| |
| unsigned int index = (this+coverage).get_coverage (glyph); |
| if (unlikely (index >= count)) return Null (MathGlyphConstruction); |
| |
| if (!vertical) |
| index += vertGlyphCount; |
| |
| return this+glyphConstruction[index]; |
| } |
| |
| protected: |
| HBUINT16 minConnectorOverlap; /* Minimum overlap of connecting |
| * glyphs during glyph construction, |
| * in design units. */ |
| OffsetTo<Coverage> vertGlyphCoverage; /* Offset to Coverage table - |
| * from the beginning of MathVariants |
| * table. */ |
| OffsetTo<Coverage> horizGlyphCoverage; /* Offset to Coverage table - |
| * from the beginning of MathVariants |
| * table. */ |
| HBUINT16 vertGlyphCount; /* Number of glyphs for which |
| * information is provided for |
| * vertically growing variants. */ |
| HBUINT16 horizGlyphCount; /* Number of glyphs for which |
| * information is provided for |
| * horizontally growing variants. */ |
| |
| /* Array of offsets to MathGlyphConstruction tables - from the beginning of |
| the MathVariants table, for shapes growing in vertical/horizontal |
| direction. */ |
| UnsizedArrayOf<OffsetTo<MathGlyphConstruction> > |
| glyphConstruction; |
| |
| public: |
| DEFINE_SIZE_ARRAY (10, glyphConstruction); |
| }; |
| |
| |
| /* |
| * MATH -- Mathematical typesetting |
| * https://docs.microsoft.com/en-us/typography/opentype/spec/math |
| */ |
| |
| struct MATH |
| { |
| static constexpr hb_tag_t tableTag = HB_OT_TAG_MATH; |
| |
| bool has_data () const { return version.to_int (); } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (version.sanitize (c) && |
| likely (version.major == 1) && |
| mathConstants.sanitize (c, this) && |
| mathGlyphInfo.sanitize (c, this) && |
| mathVariants.sanitize (c, this)); |
| } |
| |
| hb_position_t get_constant (hb_ot_math_constant_t constant, |
| hb_font_t *font) const |
| { return (this+mathConstants).get_value (constant, font); } |
| |
| const MathGlyphInfo &get_glyph_info () const { return this+mathGlyphInfo; } |
| |
| const MathVariants &get_variants () const { return this+mathVariants; } |
| |
| protected: |
| FixedVersion<>version; /* Version of the MATH table |
| * initially set to 0x00010000u */ |
| OffsetTo<MathConstants> mathConstants;/* MathConstants table */ |
| OffsetTo<MathGlyphInfo> mathGlyphInfo;/* MathGlyphInfo table */ |
| OffsetTo<MathVariants> mathVariants; /* MathVariants table */ |
| |
| public: |
| DEFINE_SIZE_STATIC (10); |
| }; |
| |
| } /* namespace OT */ |
| |
| |
| #endif /* HB_OT_MATH_TABLE_HH */ |
