Grcov report - gdef.rs

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//! `gdef` font table utilities.

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//!

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//! <https://docs.microsoft.com/en-us/typography/opentype/spec/gdef>

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use crate::layout::GDEFTable;

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pub const GLYPH_CLASS_NONE: u16 = 0;

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pub const GLYPH_CLASS_BASE: u16 = 1;

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pub const GLYPH_CLASS_LIGATURE: u16 = 2;

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pub const GLYPH_CLASS_MARK: u16 = 3;

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pub const GLYPH_CLASS_COMPONENT: u16 = 4;

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pub fn gdef_is_mark(opt_gdef_table: Option<&GDEFTable>, glyph_index: u16) -> bool {

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    glyph_class(opt_gdef_table, glyph_index) == GLYPH_CLASS_MARK

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215892

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pub fn glyph_class(opt_gdef_table: Option<&GDEFTable>, glyph: u16) -> u16 {

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    opt_gdef_table

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        .and_then(|gdef| gdef.opt_glyph_classdef.as_ref())

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        .map(|glyph_classdef| glyph_classdef.glyph_class_value(glyph))

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        .unwrap_or(GLYPH_CLASS_NONE)

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pub fn mark_attach_class(opt_gdef_table: Option<&GDEFTable>, glyph: u16) -> u16 {

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    opt_gdef_table

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        .and_then(|gdef| gdef.opt_mark_attach_classdef.as_ref())

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        .map(|mark_attach_classdef| mark_attach_classdef.glyph_class_value(glyph))

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        .unwrap_or(GLYPH_CLASS_NONE)

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pub fn glyph_is_mark_in_set(opt_gdef_table: Option<&GDEFTable>, glyph: u16, index: usize) -> bool {

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    gdef_is_mark(opt_gdef_table, glyph)

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        && opt_gdef_table

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            .and_then(|gdef| gdef.opt_mark_glyph_sets.as_ref())

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            .and_then(|mark_glyph_sets| mark_glyph_sets.get(index))

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            .is_some_and(|mark_set| mark_set.glyph_coverage_value(glyph).is_some())

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