pm-grid: start main.rs modularization (extract fonts module)
Move the 3x5 LED font (DIGITS, glyph, build_name_cols) into src/fonts.rs. Pure code move, compiler-verified identical behavior; main.rs 1835 -> ~1770 lines. First step of the recommended main.rs split; further extraction (FAT/MSC storage, views) to continue incrementally as those areas are touched. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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rust/pm-grid/src/fonts.rs
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78
rust/pm-grid/src/fonts.rs
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@ -0,0 +1,78 @@
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//! 3x5 LED font (bit2 = leftmost column) — shared by the views, the scrolling name, and the splash.
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//! Same bit convention as pico-scroll/app.py: glyph row value's bit `(1 << (2 - col))` lights a column.
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use alloc::vec::Vec;
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pub const DIGITS: [[u8; 5]; 10] = [
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[7, 5, 5, 5, 7], // 0
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[2, 6, 2, 2, 7], // 1
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[7, 1, 7, 4, 7], // 2
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[7, 1, 7, 1, 7], // 3
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[5, 5, 7, 1, 1], // 4
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[7, 4, 7, 1, 7], // 5
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[7, 4, 7, 5, 7], // 6
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[7, 1, 2, 2, 2], // 7
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[7, 5, 7, 5, 7], // 8
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[7, 5, 7, 1, 7], // 9
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];
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/// Full 3x5 uppercase glyph for a character (used by the scrolling name + boot splash).
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/// Unknown characters render blank. Digits reuse `DIGITS`.
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fn glyph(c: char) -> [u8; 5] {
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match c {
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'0'..='9' => DIGITS[c as usize - '0' as usize],
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'A' => [2, 5, 7, 5, 5],
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'B' => [6, 5, 6, 5, 6],
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'C' => [3, 4, 4, 4, 3],
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'D' => [6, 5, 5, 5, 6],
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'E' => [7, 4, 6, 4, 7],
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'F' => [7, 4, 6, 4, 4],
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'G' => [7, 4, 5, 5, 7],
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'H' => [5, 5, 7, 5, 5],
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'I' => [7, 2, 2, 2, 7],
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'J' => [1, 1, 1, 5, 2],
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'K' => [5, 6, 4, 6, 5],
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'L' => [4, 4, 4, 4, 7],
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'M' => [5, 7, 7, 5, 5],
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'N' => [5, 7, 7, 7, 5],
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'O' => [2, 5, 5, 5, 2],
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'P' => [7, 5, 7, 4, 4],
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'Q' => [2, 5, 5, 6, 3],
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'R' => [7, 5, 7, 6, 5],
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'S' => [3, 4, 2, 1, 6],
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'T' => [7, 2, 2, 2, 2],
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'U' => [5, 5, 5, 5, 7],
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'V' => [5, 5, 5, 5, 2],
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'W' => [5, 5, 7, 7, 5],
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'X' => [5, 5, 2, 5, 5],
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'Y' => [5, 5, 2, 2, 2],
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'Z' => [7, 1, 2, 4, 7],
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'-' => [0, 0, 7, 0, 0],
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'/' => [1, 1, 2, 4, 4],
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'(' => [1, 2, 2, 2, 1],
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')' => [4, 2, 2, 2, 4],
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'.' => [0, 0, 0, 0, 2],
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'+' => [0, 2, 7, 2, 0],
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'&' => [2, 5, 2, 5, 3],
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_ => [0, 0, 0, 0, 0], // space + anything unmapped
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}
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}
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/// Render a string into a list of 5-bit column slices (3 columns per glyph + a 1px gap), for the
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/// horizontal scrollers (Ticker name + boot splash). Lowercase is folded to uppercase.
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pub fn build_name_cols(name: &str) -> Vec<u8> {
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let mut cols = Vec::new();
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for ch in name.chars() {
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let g = glyph(ch.to_ascii_uppercase());
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for c in 0..3 {
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let mut col = 0u8;
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for r in 0..5 {
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if g[r] & (1 << (2 - c)) != 0 {
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col |= 1 << r;
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}
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}
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cols.push(col);
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}
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cols.push(0); // 1px gap between glyphs
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}
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cols
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}
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@ -19,6 +19,8 @@
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#![no_main]
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extern crate alloc;
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mod fonts;
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use fonts::{build_name_cols, DIGITS};
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use alloc::collections::VecDeque;
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use alloc::string::{String, ToString};
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use alloc::vec::Vec;
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@ -311,63 +313,6 @@ const APP_VERSION: &str = "0.1.0";
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const BRIGHTNESS: u8 = 160; // accent
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const NAME_BRIGHT: u8 = 120; // ticker name pixels
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// ============================== FONTS (3x5; bit2 = leftmost column) ==============================
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// Same bit convention as pico-scroll/app.py: glyph row value's bit (1<<(2-col)) lights that column.
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const DIGITS: [[u8; 5]; 10] = [
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[7, 5, 5, 5, 7], // 0
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[2, 6, 2, 2, 7], // 1
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[7, 1, 7, 4, 7], // 2
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[7, 1, 7, 1, 7], // 3
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[5, 5, 7, 1, 1], // 4
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[7, 4, 7, 1, 7], // 5
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[7, 4, 7, 5, 7], // 6
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[7, 1, 2, 2, 2], // 7
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[7, 5, 7, 5, 7], // 8
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[7, 5, 7, 1, 7], // 9
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];
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/// Full 3x5 uppercase glyph for a character (used by the scrolling name + boot splash).
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/// Unknown characters render blank. Digits reuse `DIGITS`.
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fn glyph(c: char) -> [u8; 5] {
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match c {
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'0'..='9' => DIGITS[c as usize - '0' as usize],
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'A' => [2, 5, 7, 5, 5],
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'B' => [6, 5, 6, 5, 6],
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'C' => [3, 4, 4, 4, 3],
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'D' => [6, 5, 5, 5, 6],
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'E' => [7, 4, 6, 4, 7],
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'F' => [7, 4, 6, 4, 4],
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'G' => [7, 4, 5, 5, 7],
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'H' => [5, 5, 7, 5, 5],
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'I' => [7, 2, 2, 2, 7],
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'J' => [1, 1, 1, 5, 2],
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'K' => [5, 6, 4, 6, 5],
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'L' => [4, 4, 4, 4, 7],
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'M' => [5, 7, 7, 5, 5],
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'N' => [5, 7, 7, 7, 5],
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'O' => [2, 5, 5, 5, 2],
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'P' => [7, 5, 7, 4, 4],
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'Q' => [2, 5, 5, 6, 3],
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'R' => [7, 5, 7, 6, 5],
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'S' => [3, 4, 2, 1, 6],
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'T' => [7, 2, 2, 2, 2],
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'U' => [5, 5, 5, 5, 7],
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'V' => [5, 5, 5, 5, 2],
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'W' => [5, 5, 7, 7, 5],
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'X' => [5, 5, 2, 5, 5],
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'Y' => [5, 5, 2, 2, 2],
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'Z' => [7, 1, 2, 4, 7],
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'-' => [0, 0, 7, 0, 0],
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'/' => [1, 1, 2, 4, 4],
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'(' => [1, 2, 2, 2, 1],
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')' => [4, 2, 2, 2, 4],
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'.' => [0, 0, 0, 0, 2],
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'+' => [0, 2, 7, 2, 0],
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'&' => [2, 5, 2, 5, 3],
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_ => [0, 0, 0, 0, 0], // space + anything unmapped
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}
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}
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// ============================== IS31FL3731 DRIVER (bulk framebuffer) ==============================
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// Faithful port of pico-scroll/app.py's `Matrix`: keep a 144-byte PWM framebuffer and push the
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// WHOLE thing in one I2C block write per frame (per-pixel I2C is far too slow to animate). The
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@ -559,24 +504,6 @@ fn master_bar_ns(track: &track_format::Track, tempo: i64) -> i64 {
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beat * beats.max(1)
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}
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fn build_name_cols(name: &str) -> Vec<u8> {
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let mut cols = Vec::new();
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for ch in name.chars() {
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let g = glyph(ch.to_ascii_uppercase());
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for c in 0..3 {
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let mut col = 0u8;
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for r in 0..5 {
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if g[r] & (1 << (2 - c)) != 0 {
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col |= 1 << r;
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}
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}
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cols.push(col);
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}
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cols.push(0); // 1px gap between glyphs
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}
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cols
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}
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const SCROLL_GAP: i32 = 13; // blank columns between repeats (>= name region width) for a clean loop
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impl App {
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