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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-layout-base-table.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-layout-base-table.hh | 525 |
1 files changed, 525 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-layout-base-table.hh b/gfx/harfbuzz/src/hb-ot-layout-base-table.hh new file mode 100644 index 0000000000..8179e5acd5 --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-layout-base-table.hh @@ -0,0 +1,525 @@ +/* + * Copyright © 2016 Elie Roux <elie.roux@telecom-bretagne.eu> + * Copyright © 2018 Google, Inc. + * Copyright © 2018-2019 Ebrahim Byagowi + * + * 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. + * + * Google Author(s): Behdad Esfahbod + */ + +#ifndef HB_OT_LAYOUT_BASE_TABLE_HH +#define HB_OT_LAYOUT_BASE_TABLE_HH + +#include "hb-open-type.hh" +#include "hb-ot-layout-common.hh" + +namespace OT { + +/* + * BASE -- Baseline + * https://docs.microsoft.com/en-us/typography/opentype/spec/base + */ + +struct BaseCoordFormat1 +{ + hb_position_t get_coord (hb_font_t *font, hb_direction_t direction) const + { + return HB_DIRECTION_IS_HORIZONTAL (direction) ? font->em_scale_y (coordinate) : font->em_scale_x (coordinate); + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + protected: + HBUINT16 format; /* Format identifier--format = 1 */ + FWORD coordinate; /* X or Y value, in design units */ + public: + DEFINE_SIZE_STATIC (4); +}; + +struct BaseCoordFormat2 +{ + hb_position_t get_coord (hb_font_t *font, hb_direction_t direction) const + { + /* TODO */ + return HB_DIRECTION_IS_HORIZONTAL (direction) ? font->em_scale_y (coordinate) : font->em_scale_x (coordinate); + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + protected: + HBUINT16 format; /* Format identifier--format = 2 */ + FWORD coordinate; /* X or Y value, in design units */ + HBGlyphID16 referenceGlyph; /* Glyph ID of control glyph */ + HBUINT16 coordPoint; /* Index of contour point on the + * reference glyph */ + public: + DEFINE_SIZE_STATIC (8); +}; + +struct BaseCoordFormat3 +{ + hb_position_t get_coord (hb_font_t *font, + const VariationStore &var_store, + hb_direction_t direction) const + { + const Device &device = this+deviceTable; + + return HB_DIRECTION_IS_HORIZONTAL (direction) + ? font->em_scale_y (coordinate) + device.get_y_delta (font, var_store) + : font->em_scale_x (coordinate) + device.get_x_delta (font, var_store); + } + + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + deviceTable.sanitize (c, this))); + } + + protected: + HBUINT16 format; /* Format identifier--format = 3 */ + FWORD coordinate; /* X or Y value, in design units */ + Offset16To<Device> + deviceTable; /* Offset to Device table for X or + * Y value, from beginning of + * BaseCoord table (may be NULL). */ + public: + DEFINE_SIZE_STATIC (6); +}; + +struct BaseCoord +{ + bool has_data () const { return u.format; } + + hb_position_t get_coord (hb_font_t *font, + const VariationStore &var_store, + hb_direction_t direction) const + { + switch (u.format) { + case 1: return u.format1.get_coord (font, direction); + case 2: return u.format2.get_coord (font, direction); + case 3: return u.format3.get_coord (font, var_store, direction); + default:return 0; + } + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + if (unlikely (!u.format.sanitize (c))) return_trace (false); + switch (u.format) { + case 1: return_trace (u.format1.sanitize (c)); + case 2: return_trace (u.format2.sanitize (c)); + case 3: return_trace (u.format3.sanitize (c)); + default:return_trace (false); + } + } + + protected: + union { + HBUINT16 format; + BaseCoordFormat1 format1; + BaseCoordFormat2 format2; + BaseCoordFormat3 format3; + } u; + public: + DEFINE_SIZE_UNION (2, format); +}; + +struct FeatMinMaxRecord +{ + int cmp (hb_tag_t key) const { return tag.cmp (key); } + + bool has_data () const { return tag; } + + void get_min_max (const BaseCoord **min, const BaseCoord **max) const + { + if (likely (min)) *min = &(this+minCoord); + if (likely (max)) *max = &(this+maxCoord); + } + + bool sanitize (hb_sanitize_context_t *c, const void *base) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + minCoord.sanitize (c, this) && + maxCoord.sanitize (c, this))); + } + + protected: + Tag tag; /* 4-byte feature identification tag--must + * match feature tag in FeatureList */ + Offset16To<BaseCoord> + minCoord; /* Offset to BaseCoord table that defines + * the minimum extent value, from beginning + * of MinMax table (may be NULL) */ + Offset16To<BaseCoord> + maxCoord; /* Offset to BaseCoord table that defines + * the maximum extent value, from beginning + * of MinMax table (may be NULL) */ + public: + DEFINE_SIZE_STATIC (8); + +}; + +struct MinMax +{ + void get_min_max (hb_tag_t feature_tag, + const BaseCoord **min, + const BaseCoord **max) const + { + const FeatMinMaxRecord &minMaxCoord = featMinMaxRecords.bsearch (feature_tag); + if (minMaxCoord.has_data ()) + minMaxCoord.get_min_max (min, max); + else + { + if (likely (min)) *min = &(this+minCoord); + if (likely (max)) *max = &(this+maxCoord); + } + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + minCoord.sanitize (c, this) && + maxCoord.sanitize (c, this) && + featMinMaxRecords.sanitize (c, this))); + } + + protected: + Offset16To<BaseCoord> + minCoord; /* Offset to BaseCoord table that defines + * minimum extent value, from the beginning + * of MinMax table (may be NULL) */ + Offset16To<BaseCoord> + maxCoord; /* Offset to BaseCoord table that defines + * maximum extent value, from the beginning + * of MinMax table (may be NULL) */ + SortedArray16Of<FeatMinMaxRecord> + featMinMaxRecords; + /* Array of FeatMinMaxRecords, in alphabetical + * order by featureTableTag */ + public: + DEFINE_SIZE_ARRAY (6, featMinMaxRecords); +}; + +struct BaseValues +{ + const BaseCoord &get_base_coord (int baseline_tag_index) const + { + if (baseline_tag_index == -1) baseline_tag_index = defaultIndex; + return this+baseCoords[baseline_tag_index]; + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + baseCoords.sanitize (c, this))); + } + + protected: + Index defaultIndex; /* Index number of default baseline for this + * script — equals index position of baseline tag + * in baselineTags array of the BaseTagList */ + Array16OfOffset16To<BaseCoord> + baseCoords; /* Number of BaseCoord tables defined — should equal + * baseTagCount in the BaseTagList + * + * Array of offsets to BaseCoord tables, from beginning of + * BaseValues table — order matches baselineTags array in + * the BaseTagList */ + public: + DEFINE_SIZE_ARRAY (4, baseCoords); +}; + +struct BaseLangSysRecord +{ + int cmp (hb_tag_t key) const { return baseLangSysTag.cmp (key); } + + bool has_data () const { return baseLangSysTag; } + + const MinMax &get_min_max () const { return this+minMax; } + + bool sanitize (hb_sanitize_context_t *c, const void *base) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + minMax.sanitize (c, this))); + } + + protected: + Tag baseLangSysTag; /* 4-byte language system identification tag */ + Offset16To<MinMax> + minMax; /* Offset to MinMax table, from beginning + * of BaseScript table */ + public: + DEFINE_SIZE_STATIC (6); +}; + +struct BaseScript +{ + const MinMax &get_min_max (hb_tag_t language_tag) const + { + const BaseLangSysRecord& record = baseLangSysRecords.bsearch (language_tag); + return record.has_data () ? record.get_min_max () : this+defaultMinMax; + } + + const BaseCoord &get_base_coord (int baseline_tag_index) const + { return (this+baseValues).get_base_coord (baseline_tag_index); } + + bool has_data () const { return baseValues; } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + baseValues.sanitize (c, this) && + defaultMinMax.sanitize (c, this) && + baseLangSysRecords.sanitize (c, this))); + } + + protected: + Offset16To<BaseValues> + baseValues; /* Offset to BaseValues table, from beginning + * of BaseScript table (may be NULL) */ + Offset16To<MinMax> + defaultMinMax; /* Offset to MinMax table, from beginning of + * BaseScript table (may be NULL) */ + SortedArray16Of<BaseLangSysRecord> + baseLangSysRecords; + /* Number of BaseLangSysRecords + * defined — may be zero (0) */ + + public: + DEFINE_SIZE_ARRAY (6, baseLangSysRecords); +}; + +struct BaseScriptList; +struct BaseScriptRecord +{ + int cmp (hb_tag_t key) const { return baseScriptTag.cmp (key); } + + bool has_data () const { return baseScriptTag; } + + const BaseScript &get_base_script (const BaseScriptList *list) const + { return list+baseScript; } + + bool sanitize (hb_sanitize_context_t *c, const void *base) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + baseScript.sanitize (c, base))); + } + + protected: + Tag baseScriptTag; /* 4-byte script identification tag */ + Offset16To<BaseScript> + baseScript; /* Offset to BaseScript table, from beginning + * of BaseScriptList */ + + public: + DEFINE_SIZE_STATIC (6); +}; + +struct BaseScriptList +{ + const BaseScript &get_base_script (hb_tag_t script) const + { + const BaseScriptRecord *record = &baseScriptRecords.bsearch (script); + if (!record->has_data ()) record = &baseScriptRecords.bsearch (HB_TAG ('D','F','L','T')); + return record->has_data () ? record->get_base_script (this) : Null (BaseScript); + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + baseScriptRecords.sanitize (c, this)); + } + + protected: + SortedArray16Of<BaseScriptRecord> + baseScriptRecords; + + public: + DEFINE_SIZE_ARRAY (2, baseScriptRecords); +}; + +struct Axis +{ + bool get_baseline (hb_tag_t baseline_tag, + hb_tag_t script_tag, + hb_tag_t language_tag, + const BaseCoord **coord) const + { + const BaseScript &base_script = (this+baseScriptList).get_base_script (script_tag); + if (!base_script.has_data ()) + { + *coord = nullptr; + return false; + } + + if (likely (coord)) + { + unsigned int tag_index = 0; + if (!(this+baseTagList).bfind (baseline_tag, &tag_index)) + { + *coord = nullptr; + return false; + } + *coord = &base_script.get_base_coord (tag_index); + } + + return true; + } + + bool get_min_max (hb_tag_t script_tag, + hb_tag_t language_tag, + hb_tag_t feature_tag, + const BaseCoord **min_coord, + const BaseCoord **max_coord) const + { + const BaseScript &base_script = (this+baseScriptList).get_base_script (script_tag); + if (!base_script.has_data ()) + { + *min_coord = *max_coord = nullptr; + return false; + } + + base_script.get_min_max (language_tag).get_min_max (feature_tag, min_coord, max_coord); + + return true; + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + (this+baseTagList).sanitize (c) && + (this+baseScriptList).sanitize (c))); + } + + protected: + Offset16To<SortedArray16Of<Tag>> + baseTagList; /* Offset to BaseTagList table, from beginning + * of Axis table (may be NULL) + * Array of 4-byte baseline identification tags — must + * be in alphabetical order */ + Offset16To<BaseScriptList> + baseScriptList; /* Offset to BaseScriptList table, from beginning + * of Axis table + * Array of BaseScriptRecords, in alphabetical order + * by baseScriptTag */ + + public: + DEFINE_SIZE_STATIC (4); +}; + +struct BASE +{ + static constexpr hb_tag_t tableTag = HB_OT_TAG_BASE; + + const Axis &get_axis (hb_direction_t direction) const + { return HB_DIRECTION_IS_VERTICAL (direction) ? this+vAxis : this+hAxis; } + + const VariationStore &get_var_store () const + { return version.to_int () < 0x00010001u ? Null (VariationStore) : this+varStore; } + + bool get_baseline (hb_font_t *font, + hb_tag_t baseline_tag, + hb_direction_t direction, + hb_tag_t script_tag, + hb_tag_t language_tag, + hb_position_t *base) const + { + const BaseCoord *base_coord = nullptr; + if (unlikely (!get_axis (direction).get_baseline (baseline_tag, script_tag, language_tag, &base_coord) || + !base_coord || !base_coord->has_data ())) + return false; + + if (likely (base)) + *base = base_coord->get_coord (font, get_var_store (), direction); + + return true; + } + + /* TODO: Expose this separately sometime? */ + bool get_min_max (hb_font_t *font, + hb_direction_t direction, + hb_tag_t script_tag, + hb_tag_t language_tag, + hb_tag_t feature_tag, + hb_position_t *min, + hb_position_t *max) + { + const BaseCoord *min_coord, *max_coord; + if (!get_axis (direction).get_min_max (script_tag, language_tag, feature_tag, + &min_coord, &max_coord)) + return false; + + const VariationStore &var_store = get_var_store (); + if (likely (min && min_coord)) *min = min_coord->get_coord (font, var_store, direction); + if (likely (max && max_coord)) *max = max_coord->get_coord (font, var_store, direction); + return true; + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + likely (version.major == 1) && + hAxis.sanitize (c, this) && + vAxis.sanitize (c, this) && + (version.to_int () < 0x00010001u || varStore.sanitize (c, this)))); + } + + protected: + FixedVersion<>version; /* Version of the BASE table */ + Offset16To<Axis>hAxis; /* Offset to horizontal Axis table, from beginning + * of BASE table (may be NULL) */ + Offset16To<Axis>vAxis; /* Offset to vertical Axis table, from beginning + * of BASE table (may be NULL) */ + Offset32To<VariationStore> + varStore; /* Offset to the table of Item Variation + * Store--from beginning of BASE + * header (may be NULL). Introduced + * in version 0x00010001. */ + public: + DEFINE_SIZE_MIN (8); +}; + + +} /* namespace OT */ + + +#endif /* HB_OT_LAYOUT_BASE_TABLE_HH */ |