feat(display): windows: full-screen, F1 cycles, OS bar (names, front, user); canvas-only (display-owned buffers, 4 max, reused); launchers OPEN (pm per app, terminal own), window caps minted by display; FORGET on launcher death via init courier; raster crate (font, chunked text); F-keys in input; terminal+snake on canvas; REDRAW gone
This commit is contained in:
11
crates/raster/Cargo.toml
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11
crates/raster/Cargo.toml
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[package]
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name = "raster"
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version = "0.1.0"
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edition = "2024"
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[dependencies]
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types = { workspace = true }
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port-framebuffer = { workspace = true }
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[dev-dependencies]
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driver-framebuffer-mock = { workspace = true }
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24
crates/raster/src/font/LICENSE-spleen
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crates/raster/src/font/LICENSE-spleen
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Copyright (c) 2018-2024, Frederic Cambus
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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114
crates/raster/src/font/mod.rs
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114
crates/raster/src/font/mod.rs
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//! The one font: Spleen 8x16 (BSD-2-Clause, Frederic
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//! Cambus; see LICENSE-spleen), printable ASCII only. Generated from
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//! spleen-8x16.bdf; each glyph is 16 rows, bit 7 the leftmost pixel.
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pub const WIDTH: u16 = 8;
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pub const HEIGHT: u16 = 16;
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const FIRST: u8 = b' ';
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const LAST: u8 = b'~';
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/// The glyph for `c`; anything unprintable shows as `?`.
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pub fn glyph(c: u8) -> &'static [u8; 16] {
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let c = if (FIRST..=LAST).contains(&c) { c } else { b'?' };
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&GLYPHS[usize::from(c - FIRST)]
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}
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#[rustfmt::skip]
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static GLYPHS: [[u8; 16]; 95] = [
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[0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], // ' '
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[0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00], // '!'
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[0x00, 0x66, 0x66, 0x66, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], // '"'
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[0x00, 0x00, 0x6c, 0x6c, 0xfe, 0x6c, 0x6c, 0x6c, 0x6c, 0xfe, 0x6c, 0x6c, 0x00, 0x00, 0x00, 0x00], // '#'
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[0x00, 0x10, 0x7e, 0xd0, 0xd0, 0xd0, 0x7c, 0x16, 0x16, 0x16, 0x16, 0xfc, 0x10, 0x00, 0x00, 0x00], // '$'
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[0x00, 0x00, 0x06, 0x66, 0x6c, 0x0c, 0x18, 0x18, 0x30, 0x36, 0x66, 0x60, 0x00, 0x00, 0x00, 0x00], // '%'
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[0x00, 0x00, 0x38, 0x6c, 0x6c, 0x6c, 0x38, 0x70, 0xda, 0xcc, 0xcc, 0x7a, 0x00, 0x00, 0x00, 0x00], // '&'
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[0x00, 0x18, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], // "'"
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[0x00, 0x0e, 0x18, 0x30, 0x30, 0x60, 0x60, 0x60, 0x60, 0x30, 0x30, 0x18, 0x0e, 0x00, 0x00, 0x00], // '('
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[0x00, 0x70, 0x18, 0x0c, 0x0c, 0x06, 0x06, 0x06, 0x06, 0x0c, 0x0c, 0x18, 0x70, 0x00, 0x00, 0x00], // ')'
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[0x00, 0x00, 0x00, 0x00, 0x66, 0x3c, 0x18, 0xff, 0x18, 0x3c, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00], // '*'
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[0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x7e, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], // '+'
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[0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00], // ','
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[0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], // '-'
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[0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00], // '.'
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[0x00, 0x06, 0x06, 0x0c, 0x0c, 0x18, 0x18, 0x30, 0x30, 0x60, 0x60, 0xc0, 0xc0, 0x00, 0x00, 0x00], // '/'
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[0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xce, 0xde, 0xf6, 0xe6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00], // '0'
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[0x00, 0x00, 0x18, 0x38, 0x78, 0x58, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x00, 0x00, 0x00, 0x00], // '1'
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[0x00, 0x00, 0x7c, 0xc6, 0x06, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc6, 0xfe, 0x00, 0x00, 0x00, 0x00], // '2'
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[0x00, 0x00, 0x7c, 0xc6, 0x06, 0x06, 0x3c, 0x06, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00], // '3'
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[0x00, 0x00, 0xc0, 0xc0, 0xcc, 0xcc, 0xcc, 0xcc, 0xfe, 0x0c, 0x0c, 0x0c, 0x00, 0x00, 0x00, 0x00], // '4'
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[0x00, 0x00, 0xfe, 0xc6, 0xc0, 0xc0, 0xfc, 0x06, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00], // '5'
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[0x00, 0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00], // '6'
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[0x00, 0x00, 0xfe, 0xc6, 0x06, 0x06, 0x0c, 0x18, 0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00], // '7'
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[0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00], // '8'
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[0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x06, 0x06, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00], // '9'
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[0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00], // ':'
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[0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18, 0x30, 0x00, 0x00, 0x00], // ';'
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[0x00, 0x00, 0x06, 0x0c, 0x18, 0x30, 0x60, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x00, 0x00, 0x00, 0x00], // '<'
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[0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], // '='
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[0x00, 0x00, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x06, 0x0c, 0x18, 0x30, 0x60, 0x00, 0x00, 0x00, 0x00], // '>'
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[0x00, 0x00, 0x7c, 0xc6, 0x06, 0x0c, 0x18, 0x30, 0x30, 0x00, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00], // '?'
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[0x00, 0x00, 0x00, 0x7c, 0xc2, 0xda, 0xda, 0xda, 0xda, 0xde, 0xc0, 0x7c, 0x00, 0x00, 0x00, 0x00], // '@'
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[0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'A'
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[0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xfc, 0x00, 0x00, 0x00, 0x00], // 'B'
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[0x00, 0x00, 0x7e, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'C'
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[0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xfc, 0x00, 0x00, 0x00, 0x00], // 'D'
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[0x00, 0x00, 0x7e, 0xc0, 0xc0, 0xc0, 0xf8, 0xc0, 0xc0, 0xc0, 0xc0, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'E'
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[0x00, 0x00, 0x7e, 0xc0, 0xc0, 0xc0, 0xf8, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x00, 0x00, 0x00, 0x00], // 'F'
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[0x00, 0x00, 0x7e, 0xc0, 0xc0, 0xc0, 0xde, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'G'
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[0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'H'
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[0x00, 0x00, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'I'
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[0x00, 0x00, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0xf0, 0x00, 0x00, 0x00, 0x00], // 'J'
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[0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xcc, 0xf8, 0xcc, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'K'
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[0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'L'
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[0x00, 0x00, 0xc6, 0xee, 0xfe, 0xd6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'M'
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[0x00, 0x00, 0xc6, 0xc6, 0xe6, 0xe6, 0xd6, 0xd6, 0xce, 0xce, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'N'
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[0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00], // 'O'
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[0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xfc, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x00, 0x00, 0x00, 0x00], // 'P'
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[0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xd6, 0xd6, 0x7c, 0x18, 0x0c, 0x00, 0x00], // 'Q'
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[0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'R'
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[0x00, 0x00, 0x7e, 0xc0, 0xc0, 0xc0, 0x7c, 0x06, 0x06, 0x06, 0x06, 0xfc, 0x00, 0x00, 0x00, 0x00], // 'S'
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[0x00, 0x00, 0xff, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00], // 'T'
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[0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'U'
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[0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00], // 'V'
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[0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xd6, 0xfe, 0xee, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'W'
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[0x00, 0x00, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'X'
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[0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x06, 0x06, 0x06, 0x06, 0xfc, 0x00, 0x00, 0x00, 0x00], // 'Y'
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[0x00, 0x00, 0xfe, 0x06, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xc0, 0xfe, 0x00, 0x00, 0x00, 0x00], // 'Z'
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[0x00, 0x3e, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x3e, 0x00, 0x00, 0x00], // '['
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[0x00, 0xc0, 0xc0, 0x60, 0x60, 0x30, 0x30, 0x18, 0x18, 0x0c, 0x0c, 0x06, 0x06, 0x00, 0x00, 0x00], // '\\'
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[0x00, 0x7c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x7c, 0x00, 0x00, 0x00], // ']'
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[0x00, 0x10, 0x38, 0x6c, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], // '^'
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[0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x00], // '_'
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[0x00, 0x30, 0x18, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], // '`'
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[0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0x06, 0x7e, 0xc6, 0xc6, 0xc6, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'a'
|
||||
[0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xfc, 0x00, 0x00, 0x00, 0x00], // 'b'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'c'
|
||||
[0x00, 0x00, 0x06, 0x06, 0x06, 0x7e, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'd'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xc6, 0xc6, 0xfe, 0xc0, 0xc0, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'e'
|
||||
[0x00, 0x00, 0x1e, 0x30, 0x30, 0x30, 0x7c, 0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00], // 'f'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x06, 0x06, 0xfc, 0x00], // 'g'
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||||
[0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'h'
|
||||
[0x00, 0x00, 0x18, 0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x1c, 0x00, 0x00, 0x00, 0x00], // 'i'
|
||||
[0x00, 0x00, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x70, 0x00], // 'j'
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||||
[0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xcc, 0xd8, 0xf0, 0xf0, 0xd8, 0xcc, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'k'
|
||||
[0x00, 0x00, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x1c, 0x00, 0x00, 0x00, 0x00], // 'l'
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||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0xec, 0xd6, 0xd6, 0xd6, 0xd6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'm'
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||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'n'
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||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00, 0x00, 0x00, 0x00], // 'o'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xfc, 0xc0, 0xc0, 0xc0, 0x00], // 'p'
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||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x06, 0x06, 0x06, 0x00], // 'q'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xc6, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0x00, 0x00, 0x00, 0x00], // 'r'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0xc0, 0xc0, 0x7c, 0x06, 0x06, 0xfc, 0x00, 0x00, 0x00, 0x00], // 's'
|
||||
[0x00, 0x00, 0x30, 0x30, 0x30, 0x7c, 0x30, 0x30, 0x30, 0x30, 0x30, 0x1e, 0x00, 0x00, 0x00, 0x00], // 't'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x00, 0x00, 0x00, 0x00], // 'u'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x10, 0x00, 0x00, 0x00, 0x00], // 'v'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0xd6, 0xd6, 0xd6, 0xd6, 0x6e, 0x00, 0x00, 0x00, 0x00], // 'w'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0x6c, 0x38, 0x38, 0x6c, 0xc6, 0xc6, 0x00, 0x00, 0x00, 0x00], // 'x'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x06, 0x06, 0xfc, 0x00], // 'y'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xfe, 0x00, 0x00, 0x00, 0x00], // 'z'
|
||||
[0x00, 0x0e, 0x18, 0x18, 0x18, 0x18, 0x70, 0x70, 0x18, 0x18, 0x18, 0x18, 0x0e, 0x00, 0x00, 0x00], // '{'
|
||||
[0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00], // '|'
|
||||
[0x00, 0x70, 0x18, 0x18, 0x18, 0x18, 0x0e, 0x0e, 0x18, 0x18, 0x18, 0x18, 0x70, 0x00, 0x00, 0x00], // '}'
|
||||
[0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x32, 0x7e, 0x4c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], // '~'
|
||||
];
|
||||
70
crates/raster/src/lib.rs
Normal file
70
crates/raster/src/lib.rs
Normal file
@@ -0,0 +1,70 @@
|
||||
//! Drawing on anything pixel-addressed (a `Framebuffer`): the screen, for
|
||||
//! the display server, or a window's pixel buffer, for an app.
|
||||
|
||||
#![no_std]
|
||||
#![forbid(unsafe_code)]
|
||||
|
||||
pub mod font;
|
||||
|
||||
use port_framebuffer::Framebuffer;
|
||||
use types::display::{Color, ScreenCoord};
|
||||
|
||||
/// Characters drawn per row of pixels at a time: a small buffer, so a
|
||||
/// caller's stack need not hold a whole line.
|
||||
const CHUNK: usize = 32;
|
||||
|
||||
/// `text` from (x, y), each character cell whole, `fg` on `bg`, so text
|
||||
/// overwrites what was there; cells past the right or bottom edge are left
|
||||
/// out.
|
||||
pub fn draw_text(fb: &mut impl Framebuffer, x: ScreenCoord, y: ScreenCoord, fg: Color, bg: Color, text: &[u8]) {
|
||||
let (fw, fh) = (fb.width().raw(), fb.height().raw());
|
||||
let (x0, y0) = (x.raw(), y.raw());
|
||||
if y0.saturating_add(font::HEIGHT) > fh {
|
||||
return;
|
||||
}
|
||||
let fit = (fw.saturating_sub(x0) / font::WIDTH) as usize;
|
||||
let chars = &text[..text.len().min(fit)];
|
||||
// One run per pixel row across a chunk of cells, not a call per pixel.
|
||||
let mut line = [bg; CHUNK * font::WIDTH as usize];
|
||||
for (i, chunk) in chars.chunks(CHUNK).enumerate() {
|
||||
let at = ScreenCoord::new(x0 + (i * CHUNK) as u16 * font::WIDTH);
|
||||
let line = &mut line[..chunk.len() * font::WIDTH as usize];
|
||||
for row in 0..font::HEIGHT {
|
||||
for (cell, c) in line.chunks_mut(font::WIDTH as usize).zip(chunk) {
|
||||
let bits = font::glyph(*c)[row as usize];
|
||||
for (col, px) in cell.iter_mut().enumerate() {
|
||||
*px = if bits & (0x80 >> col) != 0 { fg } else { bg };
|
||||
}
|
||||
}
|
||||
fb.write_row(at, ScreenCoord::new(y0 + row), line);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
use driver_framebuffer_mock::GridFramebuffer;
|
||||
|
||||
#[test]
|
||||
fn text_is_drawn_cell_by_cell_and_clipped_at_the_edge() {
|
||||
let mut fb = GridFramebuffer::<20, 20>::new();
|
||||
let (fg, bg) = (Color::rgb(255, 255, 255), Color::rgb(1, 1, 1));
|
||||
draw_text(&mut fb, ScreenCoord::new(0), ScreenCoord::new(0), fg, bg, b"!!!");
|
||||
// '!' has its stem in columns 3 and 4 from row 2.
|
||||
assert_eq!(fb.pixel(3, 2), Some(fg));
|
||||
assert_eq!(fb.pixel(0, 2), Some(bg));
|
||||
assert_eq!(fb.pixel(11, 2), Some(fg), "the second cell");
|
||||
assert_eq!(fb.pixel(19, 2), Some(Color::from_raw(0)), "a third cell would not fit whole");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_long_line_is_drawn_in_chunks_without_a_gap() {
|
||||
let mut fb = GridFramebuffer::<{ 8 * 70 }, 16>::new();
|
||||
let (fg, bg) = (Color::rgb(255, 255, 255), Color::rgb(1, 1, 1));
|
||||
draw_text(&mut fb, ScreenCoord::new(0), ScreenCoord::new(0), fg, bg, &[b'!'; 70]);
|
||||
// The stem of the 33rd and the 70th '!'.
|
||||
assert_eq!(fb.pixel(32 * 8 + 3, 2), Some(fg));
|
||||
assert_eq!(fb.pixel(69 * 8 + 3, 2), Some(fg));
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user