rustybuzz/hb/ot/layout/GPOS/
mark_array.rs

1use crate::hb::buffer::HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
2use crate::hb::ot_layout_gpos_table::{attach_type, AnchorExt};
3use crate::hb::ot_layout_gsubgpos::OT::hb_ot_apply_context_t;
4use ttf_parser::gpos::{AnchorMatrix, MarkArray};
5
6pub(crate) trait MarkArrayExt {
7    fn apply(
8        &self,
9        ctx: &mut hb_ot_apply_context_t,
10        anchors: AnchorMatrix,
11        mark_index: u16,
12        glyph_index: u16,
13        glyph_pos: usize,
14    ) -> Option<()>;
15}
16
17impl MarkArrayExt for MarkArray<'_> {
18    fn apply(
19        &self,
20        ctx: &mut hb_ot_apply_context_t,
21        anchors: AnchorMatrix,
22        mark_index: u16,
23        glyph_index: u16,
24        glyph_pos: usize,
25    ) -> Option<()> {
26        // If this subtable doesn't have an anchor for this base and this class
27        // return `None` such that the subsequent subtables have a chance at it.
28        let (mark_class, mark_anchor) = self.get(mark_index)?;
29        let base_anchor = anchors.get(glyph_index, mark_class)?;
30
31        let (mark_x, mark_y) = mark_anchor.get(ctx.face);
32        let (base_x, base_y) = base_anchor.get(ctx.face);
33
34        ctx.buffer
35            .unsafe_to_break(Some(glyph_pos), Some(ctx.buffer.idx + 1));
36
37        let idx = ctx.buffer.idx;
38        let pos = ctx.buffer.cur_pos_mut();
39        pos.x_offset = base_x - mark_x;
40        pos.y_offset = base_y - mark_y;
41        pos.set_attach_type(attach_type::MARK);
42        pos.set_attach_chain((glyph_pos as isize - idx as isize) as i16);
43
44        ctx.buffer.scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
45        ctx.buffer.idx += 1;
46
47        Some(())
48    }
49}
rustybuzz/hb/ot/layout/GPOS/mark_array.rs

rustybuzz/hb/ot/layout/GPOS/
mark_array.rs
