systemless 0.1.127

High-Level Emulation for classic Macintosh applications
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147

//! Hand-authored bitmap fonts, decoded at compile time.
//!
//! A face is a slice of [`GlyphSrc`] — one entry per ASCII code
//! `0x20..=0x7E` — where each glyph is written as ASCII art: `'#'` is
//! an inked pixel, `'.'` is empty. This is the *source of truth* for
//! the glyph; it lives directly in this crate as readable Rust, with
//! no external font file and no offline baker.
//!
//! [`decode_glyphs`] / [`decode_data`] are `const fn`s, so a face
//! lowers to the exact same static `[Glyph; 95]` + coverage-byte
//! buffer the runtime already blits (`0` or `255` per pixel). There is
//! no runtime rasterization and no startup cost — the tables are baked
//! by the compiler, not by a build step.
//!
//! Per glyph we store `advance` and the `(origin_x, origin_y)` offset
//! of the bitmap's top-left from the pen position (origin_y is
//! negative above the baseline, matching [`Glyph`]); width and height
//! are derived from the art itself.

use super::{FontMetrics, Glyph};

pub mod application12;
pub mod cairo18;
pub mod chicago12;
pub mod chicago9;
pub mod geneva10;
pub mod geneva12;
pub mod geneva14;
pub mod geneva18;
pub mod geneva24;
pub mod geneva9;
pub mod london18;
pub mod monaco10;
pub mod monaco12;
pub mod monaco9;
pub mod newyork12;
pub mod newyork14;
pub mod newyork18;
pub mod venice14;

/// Readable source for one glyph. `rows` is the ASCII-art bitmap:
/// every row must be the same length (the glyph width); `'#'` inks a
/// pixel, any other byte (`'.'`) leaves it clear. An empty `rows`
/// slice is a zero-size glyph (e.g. a spacer) carrying only `advance`.
pub struct GlyphSrc {
    pub advance: u8,
    pub origin_x: i8,
    pub origin_y: i8,
    pub rows: &'static [&'static str],
}

/// `g!(advance, (origin_x, origin_y), "row" "row" …)` — one glyph.
#[macro_export]
macro_rules! g {
    ($adv:expr, ($ox:expr, $oy:expr), $($row:literal)*) => {
        $crate::quickdraw::fonts::pixel_font::GlyphSrc {
            advance: $adv,
            origin_x: $ox,
            origin_y: $oy,
            rows: &[$($row),*],
        }
    };
}

const fn glyph_width(g: &GlyphSrc) -> usize {
    if g.rows.is_empty() {
        0
    } else {
        g.rows[0].len()
    }
}

/// Total coverage bytes a face occupies: `sum(width * height)`.
pub const fn data_len(src: &[GlyphSrc]) -> usize {
    let mut total = 0;
    let mut i = 0;
    while i < src.len() {
        total += glyph_width(&src[i]) * src[i].rows.len();
        i += 1;
    }
    total
}

/// Lower a face's ASCII art into the runtime `[Glyph; N]` descriptor
/// table. `data_offset` values index into the buffer produced by
/// [`decode_data`] over the same `src`.
pub const fn decode_glyphs<const N: usize>(src: &[GlyphSrc]) -> [Glyph; N] {
    let mut out = [Glyph {
        width: 0,
        height: 0,
        advance: 0,
        origin_x: 0,
        origin_y: 0,
        data_offset: 0,
    }; N];
    let mut off = 0;
    let mut i = 0;
    while i < N {
        let g = &src[i];
        let w = glyph_width(g);
        let h = g.rows.len();
        out[i] = Glyph {
            width: w as u8,
            height: h as u8,
            advance: g.advance,
            origin_x: g.origin_x,
            origin_y: g.origin_y,
            data_offset: off,
        };
        off += w * h;
        i += 1;
    }
    out
}

/// Lower a face's ASCII art into the flat coverage buffer (`0`/`255`,
/// row-major, `width * height` bytes per glyph in code-point order).
pub const fn decode_data<const LEN: usize>(src: &[GlyphSrc]) -> [u8; LEN] {
    let mut out = [0u8; LEN];
    let mut pos = 0;
    let mut i = 0;
    while i < src.len() {
        let g = &src[i];
        let w = glyph_width(g);
        let mut r = 0;
        while r < g.rows.len() {
            let bytes = g.rows[r].as_bytes();
            let mut c = 0;
            while c < w {
                out[pos] = if bytes[c] == b'#' { 255 } else { 0 };
                pos += 1;
                c += 1;
            }
            r += 1;
        }
        i += 1;
    }
    out
}

/// One fully-decoded face: `FontMetrics` plus the static glyph and
/// coverage tables, in the exact shape the runtime catalogue consumes.
pub struct DecodedFace {
    pub metrics: FontMetrics,
    pub glyphs: &'static [Glyph],
    pub data: &'static [u8],
}