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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,180 @@ | ||
| //! A [Feature Name Table]( | ||
| //! https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6feat.html) implementation. | ||
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| use crate::parser::{FromData, LazyArray16, Offset, Offset32, Stream}; | ||
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| #[derive(Clone, Copy, Debug)] | ||
| struct FeatureNameRecord { | ||
| feature: u16, | ||
| setting_table_records_count: u16, | ||
| // Offset from the beginning of the table. | ||
| setting_table_offset: Offset32, | ||
| flags: u8, | ||
| default_setting_index: u8, | ||
| name_index: u16, | ||
| } | ||
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| impl FromData for FeatureNameRecord { | ||
| const SIZE: usize = 12; | ||
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| #[inline] | ||
| fn parse(data: &[u8]) -> Option<Self> { | ||
| let mut s = Stream::new(data); | ||
| Some(FeatureNameRecord { | ||
| feature: s.read::<u16>()?, | ||
| setting_table_records_count: s.read::<u16>()?, | ||
| setting_table_offset: s.read::<Offset32>()?, | ||
| flags: s.read::<u8>()?, | ||
| default_setting_index: s.read::<u8>()?, | ||
| name_index: s.read::<u16>()?, | ||
| }) | ||
| } | ||
| } | ||
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| /// A setting name. | ||
| #[derive(Clone, Copy, Debug)] | ||
| pub struct SettingName { | ||
| /// The setting. | ||
| pub setting: u16, | ||
| /// The `name` table index for the feature's name in a 256..32768 range. | ||
| pub name_index: u16, | ||
| } | ||
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| impl FromData for SettingName { | ||
| const SIZE: usize = 4; | ||
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| #[inline] | ||
| fn parse(data: &[u8]) -> Option<Self> { | ||
| let mut s = Stream::new(data); | ||
| Some(SettingName { | ||
| setting: s.read::<u16>()?, | ||
| name_index: s.read::<u16>()?, | ||
| }) | ||
| } | ||
| } | ||
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| /// A feature names. | ||
| #[derive(Clone, Copy, Debug)] | ||
| pub struct FeatureName<'a> { | ||
| /// The feature's ID. | ||
| pub feature: u16, | ||
| /// The feature's setting names. | ||
| pub setting_names: LazyArray16<'a, SettingName>, | ||
| /// The index of the default setting in the `setting_names`. | ||
| pub default_setting_index: u8, | ||
| /// The feature's exclusive settings. If set, the feature settings are mutually exclusive. | ||
| pub exclusive: bool, | ||
| /// The `name` table index for the feature's name in a 256..32768 range. | ||
| pub name_index: u16, | ||
| } | ||
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| /// A list fo feature names. | ||
| #[derive(Clone, Copy)] | ||
| pub struct FeatureNames<'a> { | ||
| data: &'a [u8], | ||
| records: LazyArray16<'a, FeatureNameRecord>, | ||
| } | ||
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| impl<'a> FeatureNames<'a> { | ||
| /// Returns a feature name at an index. | ||
| pub fn get(&self, index: u16) -> Option<FeatureName<'a>> { | ||
| let record = self.records.get(index)?; | ||
| let data = self.data.get(record.setting_table_offset.to_usize()..)?; | ||
| let mut s = Stream::new(data); | ||
| let setting_names = s.read_array16::<SettingName>(record.setting_table_records_count)?; | ||
| Some(FeatureName { | ||
| feature: record.feature, | ||
| setting_names, | ||
| default_setting_index: | ||
| if record.flags & 0x40 != 0 { record.default_setting_index } else { 0 }, | ||
| exclusive: record.flags & 0x80 != 0, | ||
| name_index: record.name_index, | ||
| }) | ||
| } | ||
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| /// Finds a feature name by ID. | ||
| pub fn find(&self, feature: u16) -> Option<FeatureName<'a>> { | ||
| let index = self.records | ||
| .binary_search_by(|name| name.feature.cmp(&feature)).map(|(i, _)| i)?; | ||
| self.get(index) | ||
| } | ||
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| /// Returns the number of feature names. | ||
| pub fn len(&self) -> u16 { | ||
| self.records.len() | ||
| } | ||
| } | ||
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| impl<'a> core::fmt::Debug for FeatureNames<'a> { | ||
| fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result { | ||
| f.debug_list().entries(self.into_iter()).finish() | ||
| } | ||
| } | ||
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| impl<'a> IntoIterator for FeatureNames<'a> { | ||
| type Item = FeatureName<'a>; | ||
| type IntoIter = FeatureNamesIter<'a>; | ||
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| #[inline] | ||
| fn into_iter(self) -> Self::IntoIter { | ||
| FeatureNamesIter { | ||
| names: self, | ||
| index: 0, | ||
| } | ||
| } | ||
| } | ||
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| /// An iterator over [`FeatureNames`]. | ||
| #[allow(missing_debug_implementations)] | ||
| pub struct FeatureNamesIter<'a> { | ||
| names: FeatureNames<'a>, | ||
| index: u16, | ||
| } | ||
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| impl<'a> Iterator for FeatureNamesIter<'a> { | ||
| type Item = FeatureName<'a>; | ||
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| fn next(&mut self) -> Option<Self::Item> { | ||
| if self.index < self.names.len() { | ||
| self.index += 1; | ||
| self.names.get(self.index - 1) | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
| } | ||
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| /// A [Feature Name Table]( | ||
| /// https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6feat.html). | ||
| #[derive(Clone, Copy, Debug)] | ||
| pub struct Table<'a> { | ||
| /// A list of feature names. Sorted by `FeatureName.feature`. | ||
| pub names: FeatureNames<'a>, | ||
| } | ||
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| impl<'a> Table<'a> { | ||
| /// Parses a table from raw data. | ||
| pub fn parse(data: &'a [u8]) -> Option<Self> { | ||
| let mut s = Stream::new(data); | ||
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| let version = s.read::<u32>()?; | ||
| if version != 0x00010000 { | ||
| return None; | ||
| } | ||
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| let count = s.read::<u16>()?; | ||
| s.advance_checked(6)?; // reserved | ||
| let records = s.read_array16::<FeatureNameRecord>(count)?; | ||
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| Some(Table { | ||
| names: FeatureNames { | ||
| data, | ||
| records, | ||
| } | ||
| }) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| use ttf_parser::feat::Table; | ||
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| #[test] | ||
| fn basic() { | ||
| let data = &[ | ||
| 0x00, 0x01, 0x00, 0x00, // version: 1 | ||
| 0x00, 0x04, // number of features: 4 | ||
| 0x00, 0x00, // reserved | ||
| 0x00, 0x00, 0x00, 0x00, // reserved | ||
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| // Feature Name [0] | ||
| 0x00, 0x00, // feature: 0 | ||
| 0x00, 0x01, // number of settings: 1 | ||
| 0x00, 0x00, 0x00, 0x3C, // offset to settings table: 60 | ||
| 0x00, 0x00, // flags: none | ||
| 0x01, 0x04, // name index: 260 | ||
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| // Feature Name [1] | ||
| 0x00, 0x01, // feature: 1 | ||
| 0x00, 0x01, // number of settings: 1 | ||
| 0x00, 0x00, 0x00, 0x40, // offset to settings table: 64 | ||
| 0x00, 0x00, // flags: none | ||
| 0x01, 0x00, // name index: 256 | ||
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| // Feature Name [2] | ||
| 0x00, 0x03, // feature: 3 | ||
| 0x00, 0x03, // number of settings: 3 | ||
| 0x00, 0x00, 0x00, 0x44, // offset to settings table: 68 | ||
| 0x80, 0x00, // flags: exclusive | ||
| 0x01, 0x06, // name index: 262 | ||
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| // Feature Name [3] | ||
| 0x00, 0x06, // feature: 6 | ||
| 0x00, 0x01, // number of settings: 2 | ||
| 0x00, 0x00, 0x00, 0x50, // offset to settings table: 80 | ||
| 0xC0, 0x01, // flags: exclusive and other | ||
| 0x01, 0x02, // name index: 258 | ||
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| // Setting Name [0] | ||
| 0x00, 0x00, // setting: 0 | ||
| 0x01, 0x05, // name index: 261 | ||
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| // Setting Name [1] | ||
| 0x00, 0x02, // setting: 2 | ||
| 0x01, 0x01, // name index: 257 | ||
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| // Setting Name [2] | ||
| 0x00, 0x00, // setting: 0 | ||
| 0x01, 0x0C, // name index: 268 | ||
| 0x00, 0x03, // setting: 3 | ||
| 0x01, 0x08, // name index: 264 | ||
| 0x00, 0x04, // setting: 4 | ||
| 0x01, 0x09, // name index: 265 | ||
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| // Setting Name [3] | ||
| 0x00, 0x00, // setting: 0 | ||
| 0x01, 0x03, // name index: 259 | ||
| 0x00, 0x00, // setting: 1 | ||
| 0x01, 0x04, // name index: 260 | ||
| ]; | ||
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| let table = Table::parse(data).unwrap(); | ||
| assert_eq!(table.names.len(), 4); | ||
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| let feature0 = table.names.get(0).unwrap(); | ||
| assert_eq!(feature0.feature, 0); | ||
| assert_eq!(feature0.setting_names.len(), 1); | ||
| assert_eq!(feature0.exclusive, false); | ||
| assert_eq!(feature0.name_index, 260); | ||
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| let feature2 = table.names.get(2).unwrap(); | ||
| assert_eq!(feature2.feature, 3); | ||
| assert_eq!(feature2.setting_names.len(), 3); | ||
| assert_eq!(feature2.exclusive, true); | ||
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| assert_eq!(feature2.setting_names.get(1).unwrap().setting, 3); | ||
| assert_eq!(feature2.setting_names.get(1).unwrap().name_index, 264); | ||
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| let feature3 = table.names.get(3).unwrap(); | ||
| assert_eq!(feature3.default_setting_index, 1); | ||
| assert_eq!(feature3.exclusive, true); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,6 @@ | ||
| mod cff1; | ||
| mod cmap; | ||
| mod feat; | ||
| mod hmtx; | ||
| mod maxp; | ||
| mod sbix; | ||
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