Example draws widgets
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3 changed files with 122 additions and 57 deletions
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@ -9,3 +9,4 @@ edition = "2018"
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[dependencies]
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lvgl-sys = { path = "../../lvgl-sys" }
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sdl2 = "0.33.0"
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lazy_static = "1.4.0"
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@ -1,103 +1,164 @@
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use std::ffi::CString;
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use std::os::raw::c_void;
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use std::time::Duration;
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use std::mem::MaybeUninit;
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use lazy_static;
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use lvgl_sys;
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use sdl2::event::Event;
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use sdl2::keyboard::Keycode;
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use sdl2::pixels::{Color, PixelFormat, PixelFormatEnum};
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use sdl2::pixels::Color;
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use sdl2::rect::{Point, Rect};
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use sdl2::render::{WindowCanvas, CanvasBuilder, Canvas};
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use sdl2::video::Window;
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use std::ffi::CString;
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use std::mem::{MaybeUninit, ManuallyDrop};
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use std::os::raw::c_void;
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use std::time::Duration;
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use std::ptr::NonNull;
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use std::panic;
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use std::sync::mpsc::channel;
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use lvgl_sys;
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use lvgl_sys::{lv_btn_create, lv_color_t, lv_disp_buf_init, lv_disp_buf_t, lv_disp_drv_init, lv_disp_drv_register, lv_disp_drv_t, lv_disp_get_hor_res, lv_disp_get_scr_act, lv_disp_get_ver_res, lv_label_create, lv_label_set_text, lv_obj_set_pos, lv_obj_set_size, lv_obj_set_x, lv_obj_set_y, lv_obj_t, lv_task_handler, lv_area_t, lv_disp_flush_ready, LV_HOR_RES_MAX, lv_style_t, lv_style_copy, lv_style_btn_rel, LV_BTN_STYLE_PR, LV_BTN_STYLE_REL, lv_slider_set_style};
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fn main() -> Result<(), String> {
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unsafe {
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lvgl_sys::lv_init();
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}
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let sdl_context = sdl2::init()?;
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let video_subsystem = sdl_context.video()?;
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let hr: u32 = unsafe { lv_disp_get_hor_res(std::ptr::null_mut()) as u32 };
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let vr: u32 = unsafe { lv_disp_get_ver_res(std::ptr::null_mut()) as u32 };
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let hr: u32 = unsafe { lvgl_sys::lv_disp_get_hor_res(std::ptr::null_mut()) as u32 };
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let vr: u32 = unsafe { lvgl_sys::lv_disp_get_ver_res(std::ptr::null_mut()) as u32 };
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let window = video_subsystem.window("TFT Display: Demo", hr, vr)
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let window = video_subsystem
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.window("TFT Display: Demo", hr, vr)
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.position_centered()
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.opengl()
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.build()
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.map_err(|e| e.to_string())?;
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let mut canvas = window.into_canvas().build().map_err(|e| e.to_string())?;
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let mut canvas = window
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.into_canvas()
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.build().map_err(|e| e.to_string())?;
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canvas.set_draw_color(Color::RGB(255, 0, 0));
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canvas.set_draw_color(Color::RGB(255, 255, 255));
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canvas.clear();
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canvas.present();
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let mut event_pump = sdl_context.event_pump()?;
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// Create a display buffer for LittlevGL
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let mut disp_buf = MaybeUninit::<lv_disp_buf_t>::uninit();
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let mut buf: [MaybeUninit<lv_color_t>; LV_HOR_RES_MAX as usize * 10] = unsafe { MaybeUninit::uninit().assume_init() }; /*Declare a buffer for 10 lines*/
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unsafe {
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lv_disp_buf_init(disp_buf.as_mut_ptr(), buf.as_mut_ptr() as *mut c_void, std::ptr::null_mut(), (hr * 10) as u32); /*Initialize the display buffer*/
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lvgl_sys::lv_init();
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}
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// Create a display buffer for LittlevGL
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let mut disp_buf = MaybeUninit::<lvgl_sys::lv_disp_buf_t>::uninit();
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let mut buf: [MaybeUninit<lvgl_sys::lv_color_t>; lvgl_sys::LV_HOR_RES_MAX as usize * 10] =
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unsafe { MaybeUninit::uninit().assume_init() }; /*Declare a buffer for 10 lines*/
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unsafe {
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// Initialize the display buffer
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lvgl_sys::lv_disp_buf_init(
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disp_buf.as_mut_ptr(),
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buf.as_mut_ptr() as *mut c_void,
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std::ptr::null_mut(),
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(hr * 10) as u32,
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);
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}
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// Implement and register a function which can copy a pixel array to an area of your display:
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unsafe {
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unsafe extern "C" fn my_disp_flush(disp_drv: *mut lv_disp_drv_t, area: *const lv_area_t, color_p: *mut lv_color_t) {
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let mut i = 1;
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for y in (*area).y1..(*area).y2 {
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for x in (*area).x1..(*area).x2 {
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// Put a pixel to the display.
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let raw_color = *color_p.add(i);
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let color = Color::from((raw_color.ch.red, raw_color.ch.green, raw_color.ch.blue, raw_color.ch.alpha));
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if raw_color.ch.blue != 255 {
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println!("{}x{} - {:?}", x, y, color.rgb());
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}
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i = i + 1;
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}
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}
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lv_disp_flush_ready(disp_drv); /* Indicate you are ready with the flushing*/
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let mut display_driver = DisplayDriver::new(move |points, colors| {
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for (i, point) in points.into_iter().enumerate() {
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canvas.set_draw_color(colors[i]);
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canvas.draw_point(point);
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}
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canvas.present();
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});
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let mut disp_drv = MaybeUninit::<lv_disp_drv_t>::uninit().assume_init(); /*Descriptor of a display driver*/
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lv_disp_drv_init(&mut disp_drv); /*Basic initialization*/
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disp_drv.flush_cb = Some(my_disp_flush); /*Set your driver function*/
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disp_drv.buffer = disp_buf.as_mut_ptr(); /*Assign the buffer to the display*/
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lv_disp_drv_register(&mut disp_drv); /*Finally register the driver*/
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display_driver.raw.buffer = disp_buf.as_mut_ptr(); // Assign the buffer to the display
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unsafe {
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lvgl_sys::lv_disp_drv_register(&mut display_driver.raw); // Finally register the driver
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}
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// Create screen and widgets
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let mut screen = unsafe { lv_disp_get_scr_act(std::ptr::null_mut()) };
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let mut btn = unsafe { lv_btn_create(screen, std::ptr::null_mut()) };
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let mut screen = unsafe { lvgl_sys::lv_disp_get_scr_act(std::ptr::null_mut()) };
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let mut btn = unsafe { lvgl_sys::lv_btn_create(screen, std::ptr::null_mut()) };
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unsafe {
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lv_obj_set_pos(btn, 10, 10);
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lv_obj_set_size(btn, 200, 50)
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lvgl_sys::lv_obj_set_pos(btn, 10, 10);
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lvgl_sys::lv_obj_set_size(btn, 200, 50)
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}
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let mut label = unsafe { lv_label_create(btn, std::ptr::null_mut()) };
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let mut label = unsafe { lvgl_sys::lv_label_create(btn, std::ptr::null_mut()) };
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let text = CString::new("Ewa, eu te amo!").unwrap();
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unsafe {
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lv_label_set_text(label, CString::new("Click me!").unwrap().as_ptr());
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lvgl_sys::lv_label_set_text(label, text.as_ptr());
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}
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let mut event_pump = sdl_context.event_pump()?;
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'running: loop {
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for event in event_pump.poll_iter() {
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match event {
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Event::Quit { .. } | Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
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Event::Quit { .. }
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| Event::KeyDown {
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keycode: Some(Keycode::Escape),
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..
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} => {
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break 'running;
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}
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_ => {}
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}
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}
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canvas.clear();
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canvas.present();
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::std::thread::sleep(Duration::from_millis(300));
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// The rest of the game loop goes here...
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unsafe {
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lv_task_handler();
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lvgl_sys::lv_task_handler();
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}
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}
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Ok(())
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}
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struct DisplayDriver<F>
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where F: FnMut(Vec<Point>, Vec<Color>)
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{
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pub raw: lvgl_sys::lv_disp_drv_t,
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callback: F,
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}
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impl<F> DisplayDriver<F>
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where F: FnMut(Vec<Point>, Vec<Color>)
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{
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fn new(mut callback: F) -> Self {
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let disp_drv = unsafe {
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let mut disp_drv = MaybeUninit::<lvgl_sys::lv_disp_drv_t>::uninit().assume_init(); /*Descriptor of a display driver*/
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lvgl_sys::lv_disp_drv_init(&mut disp_drv); // Basic initialization
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disp_drv.flush_cb = Some(display_callback_wrapper::<F>); // Set your driver function
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disp_drv.user_data = &mut callback as *mut _ as *mut c_void;
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disp_drv
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};
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Self{ raw: disp_drv, callback }
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}
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}
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unsafe extern "C" fn display_callback_wrapper<F>(
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disp_drv: *mut lvgl_sys::lv_disp_drv_t,
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area: *const lvgl_sys::lv_area_t,
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color_p: *mut lvgl_sys::lv_color_t
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)
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where F: FnMut(Vec<Point>, Vec<Color>)
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{
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// we need to make sure panics can't escape across the FFI boundary.
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let _ = panic::catch_unwind(|| {
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let mut i = 0;
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let mut disp = *disp_drv;
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let closure = &mut *(disp.user_data as *mut F);
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let mut points = vec![];
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let mut colors = vec![];
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for y in (*area).y1..=(*area).y2 {
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for x in (*area).x1..=(*area).x2 {
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points.push(Point::new(x as i32, y as i32));
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let raw_color = *color_p.add(i);
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let color = Color::from((
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raw_color.ch.red,
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raw_color.ch.green,
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raw_color.ch.blue,
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raw_color.ch.alpha,
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));
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colors.push(color);
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i = i + 1;
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}
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}
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closure(points, colors);
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lvgl_sys::lv_disp_flush_ready(disp_drv); // Indicate you are ready with the flushing
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});
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}
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@ -1,6 +1,6 @@
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use std::{env, path::PathBuf, path::Path};
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use cc::Build;
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use bindgen;
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use cc::Build;
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use std::{env, path::Path, path::PathBuf};
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fn main() {
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let project_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap())
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.include(&lvgl_config_path)
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.compile("lvgl");
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let cc_args = ["-DLV_CONF_INCLUDE_SIMPLE=1", "-I", lvgl_config_path.to_str().unwrap()];
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let cc_args = [
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"-DLV_CONF_INCLUDE_SIMPLE=1",
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"-I",
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lvgl_config_path.to_str().unwrap(),
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];
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bindgen::Builder::default()
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.header(src.parent().unwrap().join("lvgl.h").to_str().unwrap())
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.clang_args(&cc_args)
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.expect("Can't write bindings!");
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}
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fn add_c_files(build: &mut cc::Build, path: impl AsRef<Path>) {
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for e in path.as_ref().read_dir().unwrap() {
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let e = e.unwrap();
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