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font/coretext: only pad shaped text ltr

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This commit is contained in:
Mitchell Hashimoto
2024-05-01 20:27:40 -07:00
parent 0338e09cf9
commit a8b97d4061
1 changed files with 15 additions and 2 deletions
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17
src/font/shaper/coretext.zig
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@ -210,6 +210,14 @@ pub const Shaper = struct {
pub fn shape(self: *Shaper, run: font.shape.TextRun) ![]const font.shape.Cell {
const state = &self.run_state;
// {
// log.debug("shape -----------------------------------", .{});
// for (state.codepoints.items) |entry| {
// log.debug("cp={X} cluster={}", .{ entry.codepoint, entry.cluster });
// }
// log.debug("shape end -------------------------------", .{});
// }
// Special fonts aren't shaped and their codepoint == glyph so we
// can just return the codepoints as-is.
if (run.font_index.special() != null) {
@ -322,8 +330,13 @@ pub const Shaper = struct {
// Our cluster is also our cell X position. If the cluster changes
// then we need to reset our current cell offsets.
const cluster = state.codepoints.items[index].cluster;
if (cell_offset.cluster != cluster) {
assert(cell_offset.cluster < cluster);
if (cell_offset.cluster != cluster) pad: {
// We previously asserted this but for rtl text this is
// not true. So we check for this and break out. In the
// future we probably need to reverse pad for rtl but
// I don't have a solid test case for this yet so let's
// wait for that.
if (cell_offset.cluster > cluster) break :pad;
// If we have a gap between clusters then we need to
// add empty cells to the buffer.