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}
50