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lib.rs
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lib.rs
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// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0
/*! This crate just expose the function used by the C++ integration */
#![cfg_attr(not(feature = "std"), no_std)]
extern crate alloc;
use alloc::rc::Rc;
use core::ffi::c_void;
use i_slint_core::window::{ffi::WindowAdapterRcOpaque, WindowAdapter};
use i_slint_core::SharedString;
pub mod platform;
#[cfg(feature = "i-slint-backend-selector")]
use i_slint_backend_selector::with_platform;
#[cfg(not(feature = "i-slint-backend-selector"))]
pub fn with_platform<R>(
f: impl FnOnce(
&dyn i_slint_core::platform::Platform,
) -> Result<R, i_slint_core::platform::PlatformError>,
) -> Result<R, i_slint_core::platform::PlatformError> {
i_slint_core::with_platform(|| Err(i_slint_core::platform::PlatformError::NoPlatform), f)
}
// One need to make sure something from the crate is exported,
// otherwise its symbols are not going to be in the final binary
#[cfg(feature = "testing")]
pub use i_slint_backend_testing;
#[cfg(feature = "slint-interpreter")]
pub use slint_interpreter;
#[no_mangle]
pub unsafe extern "C" fn slint_windowrc_init(out: *mut WindowAdapterRcOpaque) {
assert_eq!(
core::mem::size_of::<Rc<dyn WindowAdapter>>(),
core::mem::size_of::<WindowAdapterRcOpaque>()
);
let win = with_platform(|b| b.create_window_adapter()).unwrap();
core::ptr::write(out as *mut Rc<dyn WindowAdapter>, win);
}
#[no_mangle]
pub unsafe extern "C" fn slint_ensure_backend() {
with_platform(|_b| {
// Nothing to do, just make sure a backend was created
Ok(())
})
.unwrap()
}
#[no_mangle]
/// Enters the main event loop.
pub extern "C" fn slint_run_event_loop(quit_on_last_window_closed: bool) {
with_platform(|b| {
if !quit_on_last_window_closed {
#[allow(deprecated)]
b.set_event_loop_quit_on_last_window_closed(false);
}
b.run_event_loop()
})
.unwrap();
}
/// Will execute the given functor in the main thread
#[no_mangle]
pub unsafe extern "C" fn slint_post_event(
event: extern "C" fn(user_data: *mut c_void),
user_data: *mut c_void,
drop_user_data: Option<extern "C" fn(*mut c_void)>,
) {
struct UserData {
user_data: *mut c_void,
drop_user_data: Option<extern "C" fn(*mut c_void)>,
}
impl Drop for UserData {
fn drop(&mut self) {
if let Some(x) = self.drop_user_data {
x(self.user_data)
}
}
}
unsafe impl Send for UserData {}
let ud = UserData { user_data, drop_user_data };
i_slint_core::api::invoke_from_event_loop(move || {
let ud = &ud;
event(ud.user_data);
})
.unwrap();
}
#[no_mangle]
pub unsafe extern "C" fn slint_quit_event_loop() {
i_slint_core::api::quit_event_loop().unwrap();
}
#[cfg(feature = "std")]
#[no_mangle]
pub unsafe extern "C" fn slint_register_font_from_path(
win: *const WindowAdapterRcOpaque,
path: &SharedString,
error_str: *mut SharedString,
) {
let window_adapter = &*(win as *const Rc<dyn WindowAdapter>);
core::ptr::write(
error_str,
match window_adapter.renderer().register_font_from_path(std::path::Path::new(path.as_str()))
{
Ok(()) => Default::default(),
Err(err) => err.to_string().into(),
},
)
}
#[cfg(feature = "std")]
#[no_mangle]
pub unsafe extern "C" fn slint_register_font_from_data(
win: *const WindowAdapterRcOpaque,
data: i_slint_core::slice::Slice<'static, u8>,
error_str: *mut SharedString,
) {
let window_adapter = &*(win as *const Rc<dyn WindowAdapter>);
core::ptr::write(
error_str,
match window_adapter.renderer().register_font_from_memory(data.as_slice()) {
Ok(()) => Default::default(),
Err(err) => err.to_string().into(),
},
)
}
#[no_mangle]
pub unsafe extern "C" fn slint_register_bitmap_font(
win: *const WindowAdapterRcOpaque,
font_data: &'static i_slint_core::graphics::BitmapFont,
) {
let window_adapter = &*(win as *const Rc<dyn WindowAdapter>);
window_adapter.renderer().register_bitmap_font(font_data);
}
#[no_mangle]
pub extern "C" fn slint_string_to_float(string: &SharedString, value: &mut f32) -> bool {
match string.as_str().parse::<f32>() {
Ok(v) => {
*value = v;
true
}
Err(_) => false,
}
}
#[cfg(not(feature = "std"))]
mod allocator {
use core::alloc::Layout;
use core::ffi::c_void;
extern "C" {
pub fn free(p: *mut c_void);
pub fn malloc(size: usize) -> *mut c_void;
}
struct CAlloc;
unsafe impl core::alloc::GlobalAlloc for CAlloc {
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
let align = layout.align();
if align <= core::mem::size_of::<usize>() {
malloc(layout.size()) as *mut u8
} else {
// Ideally we'd use aligned_alloc, but that function caused heap corruption with esp-idf
let ptr = malloc(layout.size() + align) as *mut u8;
let shift = align - (ptr as usize % align);
let ptr = ptr.add(shift);
core::ptr::write(ptr.sub(1), shift as u8);
ptr
}
}
unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
let align = layout.align();
if align <= core::mem::size_of::<usize>() {
free(ptr as *mut c_void);
} else {
let shift = core::ptr::read(ptr.sub(1)) as usize;
free(ptr.sub(shift) as *mut c_void);
}
}
}
#[global_allocator]
static ALLOCATOR: CAlloc = CAlloc;
}
#[cfg(all(not(feature = "std"), not(feature = "esp-backtrace")))]
#[panic_handler]
fn panic(_info: &core::panic::PanicInfo) -> ! {
loop {}
}
#[cfg(feature = "esp-backtrace")]
use esp_backtrace as _;