rafaelcaricio/lvgl-rs
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Example draws widgets

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This commit is contained in:
Rafael Caricio 2020-04-11 19:39:20 +02:00
parent df0ff1f8eb
commit 633b076e38
3 changed files with 122 additions and 57 deletions
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1
examples/demo/Cargo.toml
View file

@ -9,3 +9,4 @@ edition = "2018"
[dependencies]
lvgl-sys = { path = "../../lvgl-sys" }
sdl2 = "0.33.0"
lazy_static = "1.4.0"

169
examples/demo/src/main.rs
View file

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

11
lvgl-sys/build.rs
View file

@ -1,6 +1,6 @@
use std::{env, path::PathBuf, path::Path};
use cc::Build;
use bindgen;
use cc::Build;
use std::{env, path::Path, path::PathBuf};
fn main() {
let project_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap())
@ -30,7 +30,11 @@ fn main() {
.include(&lvgl_config_path)
.compile("lvgl");
let cc_args = ["-DLV_CONF_INCLUDE_SIMPLE=1", "-I", lvgl_config_path.to_str().unwrap()];
let cc_args = [
"-DLV_CONF_INCLUDE_SIMPLE=1",
"-I",
lvgl_config_path.to_str().unwrap(),
];
bindgen::Builder::default()
.header(src.parent().unwrap().join("lvgl.h").to_str().unwrap())
.clang_args(&cc_args)
@ -40,7 +44,6 @@ fn main() {
.expect("Can't write bindings!");
}
fn add_c_files(build: &mut cc::Build, path: impl AsRef<Path>) {
for e in path.as_ref().read_dir().unwrap() {
let e = e.unwrap();