Frédéric Wang
8 years ago
committed by
Behdad Esfahbod
parent
e053ccc5bb
commit
ae00af4a47
3 changed files with 273 additions and 244 deletions
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/*
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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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#include "hb-open-type-private.hh" |
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#include "hb-ot-layout-math-table.hh" |
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HB_SHAPER_DATA_ENSURE_DECLARE(ot, face) |
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static inline const OT::MATH& |
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_get_math (hb_face_t *face) |
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{ |
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if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::MATH); |
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hb_ot_layout_t * layout = hb_ot_layout_from_face (face); |
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retry: |
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const OT::MATH *math = (const OT::MATH *) hb_atomic_ptr_get (&layout->math); |
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if (unlikely (!math)) |
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{ |
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hb_blob_t *blob = OT::Sanitizer<OT::MATH>::sanitize (face->reference_table (HB_OT_TAG_MATH)); |
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math = OT::Sanitizer<OT::MATH>::lock_instance (blob); |
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if (!hb_atomic_ptr_cmpexch (&layout->math, NULL, math)) |
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{ |
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hb_blob_destroy (blob); |
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goto retry; |
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} |
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layout->math_blob = blob; |
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} |
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return *math; |
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} |
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/*
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* OT::MATH |
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*/ |
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/**
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* hb_ot_math_has_data: |
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* @face: #hb_face_t to test |
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* |
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* This function allows to verify the presence of an OpenType MATH table on the |
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* face. If so, such a table will be loaded into memory and sanitized. You can |
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* then safely call other functions for math layout and shaping. |
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* |
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* Return value: #TRUE if face has a MATH table and #FALSE otherwise |
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* |
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* Since: 1.3.3 |
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**/ |
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hb_bool_t |
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hb_ot_math_has_data (hb_face_t *face) |
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{ |
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return &_get_math (face) != &OT::Null(OT::MATH); |
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} |
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/**
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* hb_ot_math_get_constant: |
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* @font: #hb_font_t from which to retrieve the value |
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* @constant: #hb_ot_math_constant_t the constant to retrieve |
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* |
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* This function returns the requested math constants as a #hb_position_t. |
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* If the request constant is HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN, |
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* HB_OT_MATH_CONSTANT_SCRIPT_SCRIPT_PERCENT_SCALE_DOWN or |
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* HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN then the return value is |
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* actually an integer between 0 and 100 representing that percentage. |
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* |
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* Return value: the requested constant or 0 |
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* |
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* Since: 1.3.3 |
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**/ |
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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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{ |
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const OT::MATH &math = _get_math (font->face); |
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return math.get_constant(constant, font); |
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} |
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/**
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* hb_ot_math_get_glyph_italics_correction: |
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* @font: #hb_font_t from which to retrieve the value |
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* @glyph: glyph index from which to retrieve the value |
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* |
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* Return value: the italics correction of the glyph or 0 |
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* |
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* Since: 1.3.3 |
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**/ |
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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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{ |
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const OT::MATH &math = _get_math (font->face); |
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return math.get_math_glyph_info().get_italics_correction (glyph, font); |
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} |
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/**
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* hb_ot_math_get_glyph_top_accent_attachment: |
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* @font: #hb_font_t from which to retrieve the value |
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* @glyph: glyph index from which to retrieve the value |
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* |
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* Return value: the top accent attachment of the glyph or 0 |
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* |
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* Since: 1.3.3 |
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**/ |
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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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{ |
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const OT::MATH &math = _get_math (font->face); |
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return math.get_math_glyph_info().get_top_accent_attachment (glyph, font); |
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} |
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/**
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* hb_ot_math_is_glyph_extended_shape: |
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* @font: a #hb_font_t to test |
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* @glyph: a glyph index to test |
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* |
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* Return value: #TRUE if the glyph is an extended shape and #FALSE otherwise |
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* |
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* Since: 1.3.3 |
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**/ |
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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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{ |
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const OT::MATH &math = _get_math (face); |
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return math.get_math_glyph_info().is_extended_shape (glyph); |
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} |
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/**
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* hb_ot_math_get_glyph_kerning: |
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* @font: #hb_font_t from which to retrieve the value |
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* @glyph: glyph index from which to retrieve the value |
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* @kern: the #hb_ot_math_kern_t from which to retrieve the value |
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* @correction_height: the correction height to use to determine the kerning. |
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* |
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* This function tries to retrieve the MathKern table for the specified font, |
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* glyph and #hb_ot_math_kern_t. Then it browses the list of heights from the |
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* MathKern table to find one value that is greater or equal to specified |
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* correction_height. If one is found the corresponding value from the list of |
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* kerns is returned and otherwise the last kern value is returned. |
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* |
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* Return value: requested kerning or 0 |
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* |
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* Since: 1.3.3 |
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**/ |
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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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{ |
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const OT::MATH &math = _get_math (font->face); |
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return math.get_math_glyph_info().get_kerning (glyph, kern, correction_height, font); |
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} |
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/**
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* hb_ot_math_get_glyph_variants: |
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* @font: #hb_font_t from which to retrieve the values |
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* @glyph: index of the glyph to stretch |
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* @direction: direction of the stretching |
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* @start_offset: offset of the first variant to retrieve |
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* @variants_count: maximum number of variants to retrieve after start_offset |
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* (IN) and actual number of variants retrieved (OUT) |
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* @variants: array of size at least @variants_count to store the result |
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* |
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* This function tries to retrieve the MathGlyphConstruction for the specified |
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* font, glyph and direction. Note that only the value of |
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* #HB_DIRECTION_IS_HORIZONTAL is considered. It provides the corresponding list |
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* of size variants as an array of hb_ot_math_glyph_variant_t structs. |
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* |
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* Return value: the total number of size variants available or 0 |
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* |
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* Since: 1.3.3 |
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**/ |
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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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{ |
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const OT::MATH &math = _get_math (font->face); |
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return math.get_math_variants().get_glyph_variants (glyph, direction, font, |
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start_offset, |
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variants_count, |
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variants); |
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} |
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/**
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* hb_ot_math_get_min_connector_overlap: |
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* @font: #hb_font_t from which to retrieve the value |
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* @direction: direction of the stretching |
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* |
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* This function tries to retrieve the MathVariants table for the specified |
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* font and returns the minimum overlap of connecting glyphs to draw a glyph |
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* assembly in the specified direction. Note that only the value of |
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* #HB_DIRECTION_IS_HORIZONTAL is considered. |
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* |
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* Return value: requested min connector overlap or 0 |
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* |
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* Since: 1.3.3 |
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**/ |
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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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{ |
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const OT::MATH &math = _get_math (font->face); |
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return math.get_math_variants().get_min_connector_overlap (direction, font); |
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} |
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/**
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* hb_ot_math_get_glyph_assembly: |
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* @font: #hb_font_t from which to retrieve the values |
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* @glyph: index of the glyph to stretch |
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* @direction: direction of the stretching |
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* @start_offset: offset of the first glyph part to retrieve |
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* @parts_count: maximum number of glyph parts to retrieve after start_offset |
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* (IN) and actual number of parts retrieved (OUT) |
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* @parts: array of size at least @parts_count to store the result |
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* @italics_correction: italic correction of the glyph assembly |
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* |
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* This function tries to retrieve the GlyphAssembly for the specified font, |
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* glyph and direction. Note that only the value of #HB_DIRECTION_IS_HORIZONTAL |
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* is considered. It provides the information necessary to draw the glyph |
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* assembly as an array of #hb_ot_math_glyph_part_t. |
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* |
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* Return value: the total number of parts in the glyph assembly |
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* |
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* Since: 1.3.3 |
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**/ |
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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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{ |
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const OT::MATH &math = _get_math (font->face); |
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return math.get_math_variants().get_glyph_parts (glyph, direction, font, |
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start_offset, |
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parts_count, |
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parts, |
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italics_correction); |
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} |
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