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C++: add a "std" feature to the slint-cpp crate

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And make it no_std otherwise

This is a first step towards getting C++ on MCU (#2136)
This commit is contained in:
Olivier Goffart 2023-07-05 12:49:34 +02:00 • committed by Olivier Goffart
parent 9afadf50be
commit aa8ef4e302
7 changed files with 37 additions and 13 deletions
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25
api/cpp/lib.rs
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@ -3,13 +3,28 @@
/*! 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 std::rc::Rc;
#[cfg(feature = "experimental")]
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 = "slint-interpreter")]
@ -21,13 +36,13 @@ pub unsafe extern "C" fn slint_windowrc_init(out: *mut WindowAdapterRcOpaque) {
core::mem::size_of::<Rc<dyn WindowAdapter>>(),
core::mem::size_of::<WindowAdapterRcOpaque>()
);
let win = i_slint_backend_selector::with_platform(|b| b.create_window_adapter()).unwrap();
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() {
i_slint_backend_selector::with_platform(|_b| {
with_platform(|_b| {
// Nothing to do, just make sure a backend was created
Ok(())
})
@ -36,7 +51,7 @@ pub unsafe extern "C" fn slint_ensure_backend() {
#[no_mangle]
pub unsafe extern "C" fn slint_run_event_loop() {
i_slint_backend_selector::with_platform(|b| b.run_event_loop()).unwrap();
with_platform(|b| b.run_event_loop()).unwrap();
}
/// Will execute the given functor in the main thread
@ -72,6 +87,7 @@ 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,
@ -89,6 +105,7 @@ pub unsafe extern "C" fn slint_register_font_from_path(
)
}
#[cfg(feature = "std")]
#[no_mangle]
pub unsafe extern "C" fn slint_register_font_from_data(
win: *const WindowAdapterRcOpaque,