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//! The lookup flag type.
//!
//! This is kind-of-but-not-quite-exactly a bit enumeration, and so we implement
//! it manually.
/// The [LookupFlag](https://learn.microsoft.com/en-us/typography/opentype/spec/chapter2#lookupFlag) bit enumeration.
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct LookupFlag(u16);
impl LookupFlag {
/// Return new, empty flags
pub fn empty() -> Self {
Self(0)
}
/// Construct a LookupFlag from a raw value, discarding invalid bits
pub fn from_bits_truncate(bits: u16) -> Self {
const VALID_BITS: u16 = !0x00E0;
Self(bits & VALID_BITS)
}
/// Raw transmutation to u16.
pub fn to_bits(self) -> u16 {
self.0
}
/// This bit relates only to the correct processing of the cursive attachment
/// lookup type (GPOS lookup type 3).
///
/// When this bit is set, the last glyph in a given sequence to which the
/// cursive attachment lookup is applied, will be positioned on the baseline.
pub fn right_to_left(self) -> bool {
(self.0 & 0x0001) != 0
}
/// This bit relates only to the correct processing of the cursive attachment
/// lookup type (GPOS lookup type 3).
///
/// When this bit is set, the last glyph in a given sequence to which the
/// cursive attachment lookup is applied, will be positioned on the baseline.
pub fn set_right_to_left(&mut self, val: bool) {
if val {
self.0 |= 0x0001
} else {
self.0 &= !0x0001
}
}
/// If set, skips over base glyphs
pub fn ignore_base_glyphs(self) -> bool {
(self.0 & 0x0002) != 0
}
/// If set, skips over base glyphs
pub fn set_ignore_base_glyphs(&mut self, val: bool) {
if val {
self.0 |= 0x0002
} else {
self.0 &= !0x0002
}
}
/// If set, skips over ligatures
pub fn ignore_ligatures(self) -> bool {
(self.0 & 0x0004) != 0
}
/// If set, skips over ligatures
pub fn set_ignore_ligatures(&mut self, val: bool) {
if val {
self.0 |= 0x0004
} else {
self.0 &= !0x0004
}
}
/// If set, skips over all combining marks
pub fn ignore_marks(self) -> bool {
(self.0 & 0x0008) != 0
}
/// If set, skips over all combining marks
pub fn set_ignore_marks(&mut self, val: bool) {
if val {
self.0 |= 0x0008
} else {
self.0 &= !0x0008
}
}
/// If set, indicates that the lookup table structure is followed by a
/// MarkFilteringSet field.
///
/// The layout engine skips over all mark glyphs not in the mark filtering set
/// indicated.
pub fn use_mark_filtering_set(self) -> bool {
(self.0 & 0x0010) != 0
}
/// If set, indicates that the lookup table structure is followed by a
/// MarkFilteringSet field.
///
/// The layout engine skips over all mark glyphs not in the mark filtering set
/// indicated.
pub fn set_use_mark_filtering_set(&mut self, val: bool) {
if val {
self.0 |= 0x0010
} else {
self.0 &= !0x0010
}
}
/// If not zero, skips over all marks of attachment type different from specified.
pub fn mark_attachment_type_mask(self) -> Option<u16> {
let val = self.0 & 0xff00;
if val == 0 {
None
} else {
Some(val >> 8)
}
}
/// If not zero, skips over all marks of attachment type different from specified.
pub fn set_mark_attachment_type(&mut self, val: u16) {
let val = (val & 0xff) << 8;
self.0 = (self.0 & 0xff) | val;
}
}
impl types::Scalar for LookupFlag {
type Raw = <u16 as types::Scalar>::Raw;
fn to_raw(self) -> Self::Raw {
self.0.to_raw()
}
fn from_raw(raw: Self::Raw) -> Self {
let t = <u16>::from_raw(raw);
Self(t)
}
}