From 994a2196745637fd0805132711b1ed9354b75426 Mon Sep 17 00:00:00 2001 From: salmonik Date: Fri, 31 Jul 2026 17:28:31 +0200 Subject: vt: decode UTF-8, render box-drawing/arrow glyphs procedurally MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The editor's gutter '│' (U+2502) appeared as '???' — write_bytes fed each UTF-8 byte to the state machine, which mapped every byte >= 0x80 to '?', and the Latin-1 font has no box-drawing glyphs anyway. - vt.write_bytes now decodes UTF-8 sequences; printable non-ASCII dispatches to the glyph path instead of the byte parser. - gop: unicode_glyph_bits() procedurally rasterises box-drawing (U+2500-257F light/heavy/double), arrows (U+2190-2193) and the em dash (U+2014) — pure geometry, no font data needed; blit_glyph falls back to it for ch >= 256. Verified via framebuffer dumps: editor gutter │ renders as a vertical line, help screen ═ separators and ←→↑↓ all render as lines (no '?'). Shell banner em dash renders too. --- CONTEXT.md | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'CONTEXT.md') diff --git a/CONTEXT.md b/CONTEXT.md index b557192..20c60f7 100644 --- a/CONTEXT.md +++ b/CONTEXT.md @@ -104,7 +104,9 @@ Single Rust crate (`x86_64-unknown-uefi` target). Module breakdown: - `gop.rs` — framebuffer rasteriser (glyph blits, pixel shifts); the text surface itself lives in `vt` - `vt.rs` — terminal emulator: cell grid, cursor, ANSI CSI parser (H/J/K, - cursor moves, SGR 16-colour, `?25l/h`), dirty-cell blitting + cursor moves, SGR 16-colour, `?25l/h`), dirty-cell blitting, UTF-8 + decoding (box-drawing `│`/`═`, arrows `←↑→↓`, em dash `—` render + procedurally instead of `?`) - `tty.rs` — line discipline: canonical `read_line` (echo, line buffer, ^C/^D) and raw `read_byte` (terminal byte protocol: arrows → `ESC [ A–D`, ^X → `0x18`, …) -- cgit v1.2.3