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rust: improve pixel-cell example

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This commit is contained in:
joseLuís 2021-04-06 12:30:32 +02:00
parent 89e38c11f3
commit 63d8645f04
1 changed files with 30 additions and 16 deletions
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46
rust/examples/pixel-cell.rs
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@ -1,11 +1,16 @@
//! sixel example
//! pixel example
//!
//! used to determine the number of pixels per cell, which is relative to font size
use libnotcurses_sys::*;
//! Shows how to get the size of a cell in pixels
//!
//! It works on the following terminals:
//! - kitty
//! - xterm (invoked with `xterm -ti vt340`)
//! - alacritty (WIP https://github.com/ayosec/alacritty/tree/graphics)
use rand::{distributions::Uniform, Rng};
use libnotcurses_sys::*;
fn main() -> NcResult<()> {
let mut nc = FullMode::new()?;
@ -13,31 +18,40 @@ fn main() -> NcResult<()> {
return Err(NcError::new_msg("Current terminal doesn't support pixels."));
}
// the dimensions of the terminal
// let (trows, tcols) = nc.term_dim_yx();
// choose the size of the cell in pixels
let pixels_w = 10;
let pixels_h = 19;
// get the dimensions of the terminal in rows,cols & x,y pixels
let mut ws: libc::winsize = unsafe { std::mem::zeroed() };
unsafe { libc::ioctl(0, libc::TIOCGWINSZ, &mut ws) };
let term_rows = ws.ws_row;
let term_cols = ws.ws_col;
let term_y = ws.ws_ypixel;
let term_x = ws.ws_xpixel;
// calculate the size of the cell in pixels
let cell_y = (term_y / term_rows) as u32;
let cell_x = (term_x / term_cols) as u32;
// println!(
// "rows,cols={},{}; term y,x={},{}; cell y,x={},{}",
// term_rows, term_cols, term_y, term_x, cell_y, cell_x
// );
// print visual delimiters around our pixelized cell
println!("0▗│▖\n│─ ─...\n2▝│▘");
println!("pixels per cell: {}x{}", pixels_w, pixels_h);
println!("0▗│▖\n│─ ─\n2▝│▘");
println!("a cell is {}x{} pixels", cell_y, cell_x);
// fill the buffer with random color pixels
let mut rng = rand::thread_rng();
let range = Uniform::from(50..=180);
let mut buffer = Vec::<u8>::with_capacity((pixels_w*pixels_h*4) as usize);
let mut buffer = Vec::<u8>::with_capacity((cell_y * cell_x * 4) as usize);
#[allow(unused_parens)]
for _byte in (0..={pixels_w*pixels_h}) {
for _byte in (0..={ cell_x * cell_y }) {
buffer.push(rng.sample(&range));
buffer.push(rng.sample(&range));
buffer.push(rng.sample(&range));
buffer.push(255);
}
let pixels = NcVisual::from_rgba(buffer.as_slice(), pixels_h, pixels_w*4, pixels_w)?;
let voptions = NcVisualOptions::without_plane(1, 2, 0, 0, pixels_h, pixels_w, NCBLIT_PIXEL, 0);
// show the newly created ncvisual delimited with the box drawing characters
let pixels = NcVisual::from_rgba(buffer.as_slice(), cell_y, cell_x * 4, cell_x)?;
let voptions = NcVisualOptions::without_plane(1, 2, 0, 0, cell_y, cell_x, NCBLIT_PIXEL, 0);
pixels.render(&mut nc, &voptions)?;
rsleep![&mut nc, 10];