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fix(editor): replace placeholder font with real 8x12 ASCII bitmap glyphs

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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
tolelom
2026-03-25 15:36:19 +09:00
parent 586792b774
commit 038398962e
1 changed files with 204 additions and 30 deletions
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232
crates/voltex_editor/src/font.rs
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@@ -8,10 +8,205 @@ pub struct FontAtlas {
pub pixels: Vec<u8>, // R8 grayscale
}
/// Classic 8x12 PC BIOS bitmap font data for ASCII 32-126 (95 characters).
/// Each character is 12 bytes (one byte per row, MSB = leftmost pixel).
#[rustfmt::skip]
const FONT_DATA: [u8; 95 * 12] = [
// 32: Space
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// 33: !
0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x18, 0x00, 0x00, 0x00,
// 34: "
0x00, 0x6C, 0x6C, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// 35: #
0x00, 0x6C, 0x6C, 0xFE, 0x6C, 0xFE, 0x6C, 0x6C, 0x00, 0x00, 0x00, 0x00,
// 36: $
0x00, 0x18, 0x3E, 0x60, 0x3C, 0x06, 0x7C, 0x18, 0x00, 0x00, 0x00, 0x00,
// 37: %
0x00, 0x00, 0x62, 0x64, 0x08, 0x10, 0x26, 0x46, 0x00, 0x00, 0x00, 0x00,
// 38: &
0x00, 0x30, 0x48, 0x48, 0x30, 0x4A, 0x44, 0x3A, 0x00, 0x00, 0x00, 0x00,
// 39: '
0x00, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// 40: (
0x00, 0x0C, 0x18, 0x30, 0x30, 0x30, 0x18, 0x0C, 0x00, 0x00, 0x00, 0x00,
// 41: )
0x00, 0x30, 0x18, 0x0C, 0x0C, 0x0C, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00,
// 42: *
0x00, 0x00, 0x66, 0x3C, 0xFF, 0x3C, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00,
// 43: +
0x00, 0x00, 0x18, 0x18, 0x7E, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00,
// 44: ,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00,
// 45: -
0x00, 0x00, 0x00, 0x00, 0x7E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// 46: .
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
// 47: /
0x00, 0x02, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x40, 0x00, 0x00, 0x00, 0x00,
// 48: 0
0x00, 0x3C, 0x66, 0x6E, 0x7E, 0x76, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 49: 1
0x00, 0x18, 0x38, 0x18, 0x18, 0x18, 0x18, 0x7E, 0x00, 0x00, 0x00, 0x00,
// 50: 2
0x00, 0x3C, 0x66, 0x06, 0x0C, 0x18, 0x30, 0x7E, 0x00, 0x00, 0x00, 0x00,
// 51: 3
0x00, 0x3C, 0x66, 0x06, 0x1C, 0x06, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 52: 4
0x00, 0x0C, 0x1C, 0x2C, 0x4C, 0x7E, 0x0C, 0x0C, 0x00, 0x00, 0x00, 0x00,
// 53: 5
0x00, 0x7E, 0x60, 0x7C, 0x06, 0x06, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 54: 6
0x00, 0x1C, 0x30, 0x60, 0x7C, 0x66, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 55: 7
0x00, 0x7E, 0x06, 0x0C, 0x18, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00,
// 56: 8
0x00, 0x3C, 0x66, 0x66, 0x3C, 0x66, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 57: 9
0x00, 0x3C, 0x66, 0x66, 0x3E, 0x06, 0x0C, 0x38, 0x00, 0x00, 0x00, 0x00,
// 58: :
0x00, 0x00, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00,
// 59: ;
0x00, 0x00, 0x18, 0x18, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00,
// 60: <
0x00, 0x06, 0x0C, 0x18, 0x30, 0x18, 0x0C, 0x06, 0x00, 0x00, 0x00, 0x00,
// 61: =
0x00, 0x00, 0x00, 0x7E, 0x00, 0x7E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// 62: >
0x00, 0x60, 0x30, 0x18, 0x0C, 0x18, 0x30, 0x60, 0x00, 0x00, 0x00, 0x00,
// 63: ?
0x00, 0x3C, 0x66, 0x06, 0x0C, 0x18, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00,
// 64: @
0x00, 0x3C, 0x66, 0x6E, 0x6A, 0x6E, 0x60, 0x3E, 0x00, 0x00, 0x00, 0x00,
// 65: A
0x00, 0x18, 0x3C, 0x66, 0x66, 0x7E, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00,
// 66: B
0x00, 0x7C, 0x66, 0x66, 0x7C, 0x66, 0x66, 0x7C, 0x00, 0x00, 0x00, 0x00,
// 67: C
0x00, 0x3C, 0x66, 0x60, 0x60, 0x60, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 68: D
0x00, 0x78, 0x6C, 0x66, 0x66, 0x66, 0x6C, 0x78, 0x00, 0x00, 0x00, 0x00,
// 69: E
0x00, 0x7E, 0x60, 0x60, 0x7C, 0x60, 0x60, 0x7E, 0x00, 0x00, 0x00, 0x00,
// 70: F
0x00, 0x7E, 0x60, 0x60, 0x7C, 0x60, 0x60, 0x60, 0x00, 0x00, 0x00, 0x00,
// 71: G
0x00, 0x3C, 0x66, 0x60, 0x6E, 0x66, 0x66, 0x3E, 0x00, 0x00, 0x00, 0x00,
// 72: H
0x00, 0x66, 0x66, 0x66, 0x7E, 0x66, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00,
// 73: I
0x00, 0x7E, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7E, 0x00, 0x00, 0x00, 0x00,
// 74: J
0x00, 0x06, 0x06, 0x06, 0x06, 0x06, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 75: K
0x00, 0x66, 0x6C, 0x78, 0x70, 0x78, 0x6C, 0x66, 0x00, 0x00, 0x00, 0x00,
// 76: L
0x00, 0x60, 0x60, 0x60, 0x60, 0x60, 0x60, 0x7E, 0x00, 0x00, 0x00, 0x00,
// 77: M
0x00, 0xC6, 0xEE, 0xFE, 0xD6, 0xC6, 0xC6, 0xC6, 0x00, 0x00, 0x00, 0x00,
// 78: N
0x00, 0x66, 0x76, 0x7E, 0x7E, 0x6E, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00,
// 79: O
0x00, 0x3C, 0x66, 0x66, 0x66, 0x66, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 80: P
0x00, 0x7C, 0x66, 0x66, 0x7C, 0x60, 0x60, 0x60, 0x00, 0x00, 0x00, 0x00,
// 81: Q
0x00, 0x3C, 0x66, 0x66, 0x66, 0x6A, 0x6C, 0x36, 0x00, 0x00, 0x00, 0x00,
// 82: R
0x00, 0x7C, 0x66, 0x66, 0x7C, 0x6C, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00,
// 83: S
0x00, 0x3C, 0x66, 0x60, 0x3C, 0x06, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 84: T
0x00, 0x7E, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
// 85: U
0x00, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 86: V
0x00, 0x66, 0x66, 0x66, 0x66, 0x66, 0x3C, 0x18, 0x00, 0x00, 0x00, 0x00,
// 87: W
0x00, 0xC6, 0xC6, 0xC6, 0xD6, 0xFE, 0xEE, 0xC6, 0x00, 0x00, 0x00, 0x00,
// 88: X
0x00, 0x66, 0x66, 0x3C, 0x18, 0x3C, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00,
// 89: Y
0x00, 0x66, 0x66, 0x66, 0x3C, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
// 90: Z
0x00, 0x7E, 0x06, 0x0C, 0x18, 0x30, 0x60, 0x7E, 0x00, 0x00, 0x00, 0x00,
// 91: [
0x00, 0x3C, 0x30, 0x30, 0x30, 0x30, 0x30, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 92: backslash
0x00, 0x40, 0x60, 0x30, 0x18, 0x0C, 0x06, 0x02, 0x00, 0x00, 0x00, 0x00,
// 93: ]
0x00, 0x3C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 94: ^
0x00, 0x18, 0x3C, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// 95: _
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x00, 0x00,
// 96: `
0x00, 0x30, 0x18, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// 97: a
0x00, 0x00, 0x00, 0x3C, 0x06, 0x3E, 0x66, 0x3E, 0x00, 0x00, 0x00, 0x00,
// 98: b
0x00, 0x60, 0x60, 0x7C, 0x66, 0x66, 0x66, 0x7C, 0x00, 0x00, 0x00, 0x00,
// 99: c
0x00, 0x00, 0x00, 0x3C, 0x66, 0x60, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 100: d
0x00, 0x06, 0x06, 0x3E, 0x66, 0x66, 0x66, 0x3E, 0x00, 0x00, 0x00, 0x00,
// 101: e
0x00, 0x00, 0x00, 0x3C, 0x66, 0x7E, 0x60, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 102: f
0x00, 0x1C, 0x30, 0x30, 0x7C, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00,
// 103: g
0x00, 0x00, 0x00, 0x3E, 0x66, 0x66, 0x3E, 0x06, 0x3C, 0x00, 0x00, 0x00,
// 104: h
0x00, 0x60, 0x60, 0x7C, 0x66, 0x66, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00,
// 105: i
0x00, 0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 106: j
0x00, 0x0C, 0x00, 0x1C, 0x0C, 0x0C, 0x0C, 0x0C, 0x78, 0x00, 0x00, 0x00,
// 107: k
0x00, 0x60, 0x60, 0x66, 0x6C, 0x78, 0x6C, 0x66, 0x00, 0x00, 0x00, 0x00,
// 108: l
0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 109: m
0x00, 0x00, 0x00, 0xEC, 0xFE, 0xD6, 0xC6, 0xC6, 0x00, 0x00, 0x00, 0x00,
// 110: n
0x00, 0x00, 0x00, 0x7C, 0x66, 0x66, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00,
// 111: o
0x00, 0x00, 0x00, 0x3C, 0x66, 0x66, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00,
// 112: p
0x00, 0x00, 0x00, 0x7C, 0x66, 0x66, 0x7C, 0x60, 0x60, 0x00, 0x00, 0x00,
// 113: q
0x00, 0x00, 0x00, 0x3E, 0x66, 0x66, 0x3E, 0x06, 0x06, 0x00, 0x00, 0x00,
// 114: r
0x00, 0x00, 0x00, 0x7C, 0x66, 0x60, 0x60, 0x60, 0x00, 0x00, 0x00, 0x00,
// 115: s
0x00, 0x00, 0x00, 0x3E, 0x60, 0x3C, 0x06, 0x7C, 0x00, 0x00, 0x00, 0x00,
// 116: t
0x00, 0x30, 0x30, 0x7C, 0x30, 0x30, 0x30, 0x1C, 0x00, 0x00, 0x00, 0x00,
// 117: u
0x00, 0x00, 0x00, 0x66, 0x66, 0x66, 0x66, 0x3E, 0x00, 0x00, 0x00, 0x00,
// 118: v
0x00, 0x00, 0x00, 0x66, 0x66, 0x66, 0x3C, 0x18, 0x00, 0x00, 0x00, 0x00,
// 119: w
0x00, 0x00, 0x00, 0xC6, 0xC6, 0xD6, 0xFE, 0x6C, 0x00, 0x00, 0x00, 0x00,
// 120: x
0x00, 0x00, 0x00, 0x66, 0x3C, 0x18, 0x3C, 0x66, 0x00, 0x00, 0x00, 0x00,
// 121: y
0x00, 0x00, 0x00, 0x66, 0x66, 0x66, 0x3E, 0x06, 0x3C, 0x00, 0x00, 0x00,
// 122: z
0x00, 0x00, 0x00, 0x7E, 0x0C, 0x18, 0x30, 0x7E, 0x00, 0x00, 0x00, 0x00,
// 123: {
0x00, 0x0E, 0x18, 0x18, 0x70, 0x18, 0x18, 0x0E, 0x00, 0x00, 0x00, 0x00,
// 124: |
0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00,
// 125: }
0x00, 0x70, 0x18, 0x18, 0x0E, 0x18, 0x18, 0x70, 0x00, 0x00, 0x00, 0x00,
// 126: ~
0x00, 0x32, 0x4C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
];
impl FontAtlas {
/// Generate a minimal font atlas.
/// Generate a bitmap font atlas with real 8x12 PC BIOS-style glyphs.
/// Each glyph is 8x12 pixels. Atlas is 16 cols x 6 rows = 128x72.
/// Space (32) = all zeros. Other chars get a simple recognizable pattern.
pub fn generate() -> Self {
let glyph_width: u32 = 8;
let glyph_height: u32 = 12;
@@ -22,41 +217,20 @@ impl FontAtlas {
let mut pixels = vec![0u8; (width * height) as usize];
// ASCII 32 (space) through 126 (~) = 95 characters
// Unpack 1-bit-per-pixel FONT_DATA into R8 pixel atlas
for code in 32u8..=126u8 {
let index = (code - 32) as u32;
let col = index % cols;
let row = index / cols;
let base_x = col * glyph_width;
let base_y = row * glyph_height;
let data_offset = (index as usize) * 12;
if code == 32 {
// Space: all zeros (already zero)
continue;
}
// Generate a recognizable pattern based on char code.
// Draw a border frame + inner pattern derived from code value.
for py in 0..glyph_height {
for px in 0..glyph_width {
for py in 0..12u32 {
let row_byte = FONT_DATA[data_offset + py as usize];
for px in 0..8u32 {
if (row_byte >> (7 - px)) & 1 != 0 {
let pixel_idx = ((base_y + py) * width + (base_x + px)) as usize;
let on_border = px == 0 || px == glyph_width - 1
|| py == 0 || py == glyph_height - 1;
// Inner pattern: use bits of char code to create variation
let inner_bit = ((code as u32).wrapping_mul(px + 1).wrapping_mul(py + 1)) & 0x3;
let on_inner = inner_bit == 0 && px > 1 && px < glyph_width - 2
&& py > 2 && py < glyph_height - 2;
// Horizontal bar in middle for letter-like appearance
let mid_y = glyph_height / 2;
let on_midbar = py == mid_y && px > 1 && px < glyph_width - 2;
// Vertical stem on left side
let on_stem = px == 2 && py > 1 && py < glyph_height - 2;
if on_border || on_inner || on_midbar || on_stem {
pixels[pixel_idx] = 255;
}
}