Frédéric Wang
8 years ago
committed by
Behdad Esfahbod
parent
e053ccc5bb
commit
ae00af4a47
3 changed files with 273 additions and 244 deletions
@ -0,0 +1,272 @@ |
|||||||
|
/*
|
||||||
|
* 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 |
||||||
|
*/ |
||||||
|
|
||||||
|
#include "hb-open-type-private.hh" |
||||||
|
|
||||||
|
#include "hb-ot-layout-math-table.hh" |
||||||
|
|
||||||
|
HB_SHAPER_DATA_ENSURE_DECLARE(ot, face) |
||||||
|
|
||||||
|
static inline const OT::MATH& |
||||||
|
_get_math (hb_face_t *face) |
||||||
|
{ |
||||||
|
if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::MATH); |
||||||
|
|
||||||
|
hb_ot_layout_t * layout = hb_ot_layout_from_face (face); |
||||||
|
|
||||||
|
retry: |
||||||
|
const OT::MATH *math = (const OT::MATH *) hb_atomic_ptr_get (&layout->math); |
||||||
|
|
||||||
|
if (unlikely (!math)) |
||||||
|
{ |
||||||
|
hb_blob_t *blob = OT::Sanitizer<OT::MATH>::sanitize (face->reference_table (HB_OT_TAG_MATH)); |
||||||
|
math = OT::Sanitizer<OT::MATH>::lock_instance (blob); |
||||||
|
if (!hb_atomic_ptr_cmpexch (&layout->math, NULL, math)) |
||||||
|
{ |
||||||
|
hb_blob_destroy (blob); |
||||||
|
goto retry; |
||||||
|
} |
||||||
|
layout->math_blob = blob; |
||||||
|
} |
||||||
|
|
||||||
|
return *math; |
||||||
|
} |
||||||
|
|
||||||
|
/*
|
||||||
|
* OT::MATH |
||||||
|
*/ |
||||||
|
|
||||||
|
/**
|
||||||
|
* hb_ot_math_has_data: |
||||||
|
* @face: #hb_face_t to test |
||||||
|
* |
||||||
|
* This function allows to verify the presence of an OpenType MATH table on the |
||||||
|
* face. If so, such a table will be loaded into memory and sanitized. You can |
||||||
|
* then safely call other functions for math layout and shaping. |
||||||
|
* |
||||||
|
* Return value: #TRUE if face has a MATH table and #FALSE otherwise |
||||||
|
* |
||||||
|
* Since: 1.3.3 |
||||||
|
**/ |
||||||
|
hb_bool_t |
||||||
|
hb_ot_math_has_data (hb_face_t *face) |
||||||
|
{ |
||||||
|
return &_get_math (face) != &OT::Null(OT::MATH); |
||||||
|
} |
||||||
|
|
||||||
|
/**
|
||||||
|
* hb_ot_math_get_constant: |
||||||
|
* @font: #hb_font_t from which to retrieve the value |
||||||
|
* @constant: #hb_ot_math_constant_t the constant to retrieve |
||||||
|
* |
||||||
|
* This function returns the requested math constants as a #hb_position_t. |
||||||
|
* If the request constant is HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN, |
||||||
|
* HB_OT_MATH_CONSTANT_SCRIPT_SCRIPT_PERCENT_SCALE_DOWN or |
||||||
|
* HB_OT_MATH_CONSTANT_SCRIPT_PERCENT_SCALE_DOWN then the return value is |
||||||
|
* actually an integer between 0 and 100 representing that percentage. |
||||||
|
* |
||||||
|
* Return value: the requested constant or 0 |
||||||
|
* |
||||||
|
* Since: 1.3.3 |
||||||
|
**/ |
||||||
|
hb_position_t |
||||||
|
hb_ot_math_get_constant (hb_font_t *font, |
||||||
|
hb_ot_math_constant_t constant) |
||||||
|
{ |
||||||
|
const OT::MATH &math = _get_math (font->face); |
||||||
|
return math.get_constant(constant, font); |
||||||
|
} |
||||||
|
|
||||||
|
/**
|
||||||
|
* hb_ot_math_get_glyph_italics_correction: |
||||||
|
* @font: #hb_font_t from which to retrieve the value |
||||||
|
* @glyph: glyph index from which to retrieve the value |
||||||
|
* |
||||||
|
* Return value: the italics correction of the glyph or 0 |
||||||
|
* |
||||||
|
* Since: 1.3.3 |
||||||
|
**/ |
||||||
|
hb_position_t |
||||||
|
hb_ot_math_get_glyph_italics_correction (hb_font_t *font, |
||||||
|
hb_codepoint_t glyph) |
||||||
|
{ |
||||||
|
const OT::MATH &math = _get_math (font->face); |
||||||
|
return math.get_math_glyph_info().get_italics_correction (glyph, font); |
||||||
|
} |
||||||
|
|
||||||
|
/**
|
||||||
|
* hb_ot_math_get_glyph_top_accent_attachment: |
||||||
|
* @font: #hb_font_t from which to retrieve the value |
||||||
|
* @glyph: glyph index from which to retrieve the value |
||||||
|
* |
||||||
|
* Return value: the top accent attachment of the glyph or 0 |
||||||
|
* |
||||||
|
* Since: 1.3.3 |
||||||
|
**/ |
||||||
|
hb_position_t |
||||||
|
hb_ot_math_get_glyph_top_accent_attachment (hb_font_t *font, |
||||||
|
hb_codepoint_t glyph) |
||||||
|
{ |
||||||
|
const OT::MATH &math = _get_math (font->face); |
||||||
|
return math.get_math_glyph_info().get_top_accent_attachment (glyph, font); |
||||||
|
} |
||||||
|
|
||||||
|
/**
|
||||||
|
* hb_ot_math_is_glyph_extended_shape: |
||||||
|
* @font: a #hb_font_t to test |
||||||
|
* @glyph: a glyph index to test |
||||||
|
* |
||||||
|
* Return value: #TRUE if the glyph is an extended shape and #FALSE otherwise |
||||||
|
* |
||||||
|
* Since: 1.3.3 |
||||||
|
**/ |
||||||
|
hb_bool_t |
||||||
|
hb_ot_math_is_glyph_extended_shape (hb_face_t *face, |
||||||
|
hb_codepoint_t glyph) |
||||||
|
{ |
||||||
|
const OT::MATH &math = _get_math (face); |
||||||
|
return math.get_math_glyph_info().is_extended_shape (glyph); |
||||||
|
} |
||||||
|
|
||||||
|
/**
|
||||||
|
* hb_ot_math_get_glyph_kerning: |
||||||
|
* @font: #hb_font_t from which to retrieve the value |
||||||
|
* @glyph: glyph index from which to retrieve the value |
||||||
|
* @kern: the #hb_ot_math_kern_t from which to retrieve the value |
||||||
|
* @correction_height: the correction height to use to determine the kerning. |
||||||
|
* |
||||||
|
* This function tries to retrieve the MathKern table for the specified font, |
||||||
|
* glyph and #hb_ot_math_kern_t. Then it browses the list of heights from the |
||||||
|
* MathKern table to find one value that is greater or equal to specified |
||||||
|
* correction_height. If one is found the corresponding value from the list of |
||||||
|
* kerns is returned and otherwise the last kern value is returned. |
||||||
|
* |
||||||
|
* Return value: requested kerning or 0 |
||||||
|
* |
||||||
|
* Since: 1.3.3 |
||||||
|
**/ |
||||||
|
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) |
||||||
|
{ |
||||||
|
const OT::MATH &math = _get_math (font->face); |
||||||
|
return math.get_math_glyph_info().get_kerning (glyph, kern, correction_height, font); |
||||||
|
} |
||||||
|
|
||||||
|
/**
|
||||||
|
* hb_ot_math_get_glyph_variants: |
||||||
|
* @font: #hb_font_t from which to retrieve the values |
||||||
|
* @glyph: index of the glyph to stretch |
||||||
|
* @direction: direction of the stretching |
||||||
|
* @start_offset: offset of the first variant to retrieve |
||||||
|
* @variants_count: maximum number of variants to retrieve after start_offset |
||||||
|
* (IN) and actual number of variants retrieved (OUT) |
||||||
|
* @variants: array of size at least @variants_count to store the result |
||||||
|
* |
||||||
|
* This function tries to retrieve the MathGlyphConstruction for the specified |
||||||
|
* font, glyph and direction. Note that only the value of |
||||||
|
* #HB_DIRECTION_IS_HORIZONTAL is considered. It provides the corresponding list |
||||||
|
* of size variants as an array of hb_ot_math_glyph_variant_t structs. |
||||||
|
* |
||||||
|
* Return value: the total number of size variants available or 0 |
||||||
|
* |
||||||
|
* Since: 1.3.3 |
||||||
|
**/ |
||||||
|
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 */) |
||||||
|
{ |
||||||
|
const OT::MATH &math = _get_math (font->face); |
||||||
|
return math.get_math_variants().get_glyph_variants (glyph, direction, font, |
||||||
|
start_offset, |
||||||
|
variants_count, |
||||||
|
variants); |
||||||
|
} |
||||||
|
|
||||||
|
/**
|
||||||
|
* hb_ot_math_get_min_connector_overlap: |
||||||
|
* @font: #hb_font_t from which to retrieve the value |
||||||
|
* @direction: direction of the stretching |
||||||
|
* |
||||||
|
* This function tries to retrieve the MathVariants table for the specified |
||||||
|
* font and returns the minimum overlap of connecting glyphs to draw a glyph |
||||||
|
* assembly in the specified direction. Note that only the value of |
||||||
|
* #HB_DIRECTION_IS_HORIZONTAL is considered. |
||||||
|
* |
||||||
|
* Return value: requested min connector overlap or 0 |
||||||
|
* |
||||||
|
* Since: 1.3.3 |
||||||
|
**/ |
||||||
|
hb_position_t |
||||||
|
hb_ot_math_get_min_connector_overlap (hb_font_t *font, |
||||||
|
hb_direction_t direction) |
||||||
|
{ |
||||||
|
const OT::MATH &math = _get_math (font->face); |
||||||
|
return math.get_math_variants().get_min_connector_overlap (direction, font); |
||||||
|
} |
||||||
|
|
||||||
|
/**
|
||||||
|
* hb_ot_math_get_glyph_assembly: |
||||||
|
* @font: #hb_font_t from which to retrieve the values |
||||||
|
* @glyph: index of the glyph to stretch |
||||||
|
* @direction: direction of the stretching |
||||||
|
* @start_offset: offset of the first glyph part to retrieve |
||||||
|
* @parts_count: maximum number of glyph parts to retrieve after start_offset |
||||||
|
* (IN) and actual number of parts retrieved (OUT) |
||||||
|
* @parts: array of size at least @parts_count to store the result |
||||||
|
* @italics_correction: italic correction of the glyph assembly |
||||||
|
* |
||||||
|
* This function tries to retrieve the GlyphAssembly for the specified font, |
||||||
|
* glyph and direction. Note that only the value of #HB_DIRECTION_IS_HORIZONTAL |
||||||
|
* is considered. It provides the information necessary to draw the glyph |
||||||
|
* assembly as an array of #hb_ot_math_glyph_part_t. |
||||||
|
* |
||||||
|
* Return value: the total number of parts in the glyph assembly |
||||||
|
* |
||||||
|
* Since: 1.3.3 |
||||||
|
**/ |
||||||
|
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 */) |
||||||
|
{ |
||||||
|
const OT::MATH &math = _get_math (font->face); |
||||||
|
return math.get_math_variants().get_glyph_parts (glyph, direction, font, |
||||||
|
start_offset, |
||||||
|
parts_count, |
||||||
|
parts, |
||||||
|
italics_correction); |
||||||
|
} |
||||||
Loading…
Reference in new issue