fruit.rs

use image::GenericImageView;
use softbuffer::{Context, Pixel, Surface};
use std::num::NonZeroU32;
use winit::event::{KeyEvent, WindowEvent};
use winit::event_loop::{ControlFlow, EventLoop};
use winit::keyboard::{Key, NamedKey};

mod util;

fn main() {
    util::setup();

    //see fruit.jpg.license for the license of fruit.jpg
    let fruit = image::load_from_memory(include_bytes!("fruit.jpg")).unwrap();
    let (width, height) = (fruit.width(), fruit.height());

    let event_loop = EventLoop::new().unwrap();
    let context = Context::new(event_loop.owned_display_handle()).unwrap();

    let app = util::WinitAppBuilder::with_init(
        move |elwt| {
            util::make_window(elwt, |w| {
                w.with_inner_size(winit::dpi::PhysicalSize::new(width, height))
            })
        },
        move |_elwt, window| {
            let mut surface = Surface::new(&context, window.clone()).unwrap();
            // Intentionally only set the size of the surface once, at creation.
            // This is needed if the window chooses to ignore the size we passed in above, and for the
            // platforms softbuffer supports that don't yet extract the size from the window.
            surface
                .resize(
                    NonZeroU32::new(width).unwrap(),
                    NonZeroU32::new(height).unwrap(),
                )
                .unwrap();
            surface
        },
    )
    .with_event_handler(move |window, surface, window_id, event, elwt| {
        elwt.set_control_flow(ControlFlow::Wait);

        if window_id != window.id() {
            return;
        }

        match event {
            WindowEvent::RedrawRequested => {
                let Some(surface) = surface else {
                    tracing::error!("RedrawRequested fired before Resumed or after Suspended");
                    return;
                };

                let mut buffer = surface.buffer_mut().unwrap();
                let width = fruit.width();
                for (x, y, pixel) in fruit.pixels() {
                    let pixel = Pixel::new_rgb(pixel.0[0], pixel.0[1], pixel.0[2]);
                    buffer.pixels()[(y * width + x) as usize] = pixel;
                }

                buffer.present().unwrap();
            }
            WindowEvent::CloseRequested
            | WindowEvent::KeyboardInput {
                event:
                    KeyEvent {
                        logical_key: Key::Named(NamedKey::Escape),
                        ..
                    },
                ..
            } => {
                elwt.exit();
            }
            _ => {}
        }
    });

    util::run_app(event_loop, app);
}