223 lines
7.8 KiB
C++
223 lines
7.8 KiB
C++
/*
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* Copyright © 2018 Ebrahim Byagowi
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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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#ifndef HB_AAT_LAYOUT_FEAT_TABLE_HH
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#define HB_AAT_LAYOUT_FEAT_TABLE_HH
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#include "hb-aat-layout-common.hh"
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/*
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* feat -- Feature Name
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* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6feat.html
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*/
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#define HB_AAT_TAG_feat HB_TAG('f','e','a','t')
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namespace AAT {
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struct SettingName
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{
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friend struct FeatureName;
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int cmp (hb_aat_layout_feature_selector_t key) const
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{ return (int) key - (int) setting; }
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hb_aat_layout_feature_selector_t get_selector () const
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{ return (hb_aat_layout_feature_selector_t) (unsigned) setting; }
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hb_aat_layout_feature_selector_info_t get_info (hb_aat_layout_feature_selector_t default_selector) const
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{
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return {
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nameIndex,
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(hb_aat_layout_feature_selector_t) (unsigned int) setting,
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default_selector == HB_AAT_LAYOUT_FEATURE_SELECTOR_INVALID
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? (hb_aat_layout_feature_selector_t) (setting + 1)
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: default_selector,
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0
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};
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}
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this)));
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}
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protected:
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HBUINT16 setting; /* The setting. */
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NameID nameIndex; /* The name table index for the setting's name. */
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public:
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DEFINE_SIZE_STATIC (4);
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};
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DECLARE_NULL_NAMESPACE_BYTES (AAT, SettingName);
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struct feat;
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struct FeatureName
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{
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int cmp (hb_aat_layout_feature_type_t key) const
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{ return (int) key - (int) feature; }
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enum {
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Exclusive = 0x8000, /* If set, the feature settings are mutually exclusive. */
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NotDefault = 0x4000, /* If clear, then the setting with an index of 0 in
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* the setting name array for this feature should
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* be taken as the default for the feature
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* (if one is required). If set, then bits 0-15 of this
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* featureFlags field contain the index of the setting
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* which is to be taken as the default. */
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IndexMask = 0x00FF /* If bits 30 and 31 are set, then these sixteen bits
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* indicate the index of the setting in the setting name
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* array for this feature which should be taken
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* as the default. */
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};
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unsigned int get_selector_infos (unsigned int start_offset,
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unsigned int *selectors_count, /* IN/OUT. May be NULL. */
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hb_aat_layout_feature_selector_info_t *selectors, /* OUT. May be NULL. */
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unsigned int *pdefault_index, /* OUT. May be NULL. */
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const void *base) const
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{
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hb_array_t< const SettingName> settings_table = (base+settingTableZ).as_array (nSettings);
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static_assert (Index::NOT_FOUND_INDEX == HB_AAT_LAYOUT_NO_SELECTOR_INDEX, "");
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hb_aat_layout_feature_selector_t default_selector = HB_AAT_LAYOUT_FEATURE_SELECTOR_INVALID;
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unsigned int default_index = Index::NOT_FOUND_INDEX;
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if (featureFlags & Exclusive)
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{
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default_index = (featureFlags & NotDefault) ? featureFlags & IndexMask : 0;
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default_selector = settings_table[default_index].get_selector ();
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}
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if (pdefault_index)
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*pdefault_index = default_index;
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if (selectors_count)
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{
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+ settings_table.sub_array (start_offset, selectors_count)
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| hb_map ([=] (const SettingName& setting) { return setting.get_info (default_selector); })
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| hb_sink (hb_array (selectors, *selectors_count))
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;
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}
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return settings_table.length;
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}
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hb_aat_layout_feature_type_t get_feature_type () const
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{ return (hb_aat_layout_feature_type_t) (unsigned int) feature; }
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hb_ot_name_id_t get_feature_name_id () const { return nameIndex; }
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bool is_exclusive () const { return featureFlags & Exclusive; }
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/* A FeatureName with no settings is meaningless */
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bool has_data () const { return nSettings; }
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bool sanitize (hb_sanitize_context_t *c, const void *base) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this) &&
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(base+settingTableZ).sanitize (c, nSettings)));
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}
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protected:
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HBUINT16 feature; /* Feature type. */
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HBUINT16 nSettings; /* The number of records in the setting name array. */
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NNOffset32To<UnsizedArrayOf<SettingName>>
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settingTableZ; /* Offset in bytes from the beginning of this table to
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* this feature's setting name array. The actual type of
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* record this offset refers to will depend on the
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* exclusivity value, as described below. */
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HBUINT16 featureFlags; /* Single-bit flags associated with the feature type. */
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HBINT16 nameIndex; /* The name table index for the feature's name.
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* This index has values greater than 255 and
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* less than 32768. */
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public:
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DEFINE_SIZE_STATIC (12);
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};
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struct feat
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{
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static constexpr hb_tag_t tableTag = HB_AAT_TAG_feat;
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bool has_data () const { return version.to_int (); }
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unsigned int get_feature_types (unsigned int start_offset,
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unsigned int *count,
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hb_aat_layout_feature_type_t *features) const
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{
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if (count)
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{
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+ namesZ.as_array (featureNameCount).sub_array (start_offset, count)
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| hb_map (&FeatureName::get_feature_type)
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| hb_sink (hb_array (features, *count))
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;
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}
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return featureNameCount;
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}
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bool exposes_feature (hb_aat_layout_feature_type_t feature_type) const
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{ return get_feature (feature_type).has_data (); }
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const FeatureName& get_feature (hb_aat_layout_feature_type_t feature_type) const
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{ return namesZ.bsearch (featureNameCount, feature_type); }
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hb_ot_name_id_t get_feature_name_id (hb_aat_layout_feature_type_t feature) const
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{ return get_feature (feature).get_feature_name_id (); }
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unsigned int get_selector_infos (hb_aat_layout_feature_type_t feature_type,
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unsigned int start_offset,
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unsigned int *selectors_count, /* IN/OUT. May be NULL. */
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hb_aat_layout_feature_selector_info_t *selectors, /* OUT. May be NULL. */
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unsigned int *default_index /* OUT. May be NULL. */) const
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{
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return get_feature (feature_type).get_selector_infos (start_offset, selectors_count, selectors,
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default_index, this);
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}
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this) &&
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version.major == 1 &&
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namesZ.sanitize (c, featureNameCount, this)));
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}
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protected:
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FixedVersion<>version; /* Version number of the feature name table
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* (0x00010000 for the current version). */
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HBUINT16 featureNameCount;
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/* The number of entries in the feature name array. */
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HBUINT16 reserved1; /* Reserved (set to zero). */
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HBUINT32 reserved2; /* Reserved (set to zero). */
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SortedUnsizedArrayOf<FeatureName>
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namesZ; /* The feature name array. */
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public:
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DEFINE_SIZE_ARRAY (12, namesZ);
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};
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} /* namespace AAT */
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#endif /* HB_AAT_LAYOUT_FEAT_TABLE_HH */
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