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fix(cairo): huge memory leak

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Fixes increasing the reference count of the `Context` without ever decreasing it.

Fixes #972
This commit is contained in:
Jake Stanger 2025-05-14 22:29:06 +01:00
parent fe1d28cda8
commit e240ab7acb
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GPG key ID: C51FC8F9CB0BEA61
1 changed files with 14 additions and 8 deletions
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22
src/modules/cairo.rs
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@ -3,7 +3,7 @@ use crate::modules::{Module, ModuleInfo, ModuleParts, ModuleUpdateEvent, WidgetC
use crate::{glib_recv, module_impl, spawn, try_send};
use cairo::{Format, ImageSurface};
use glib::Propagation;
use glib::translate::IntoGlibPtr;
use glib::translate::ToGlibPtr;
use gtk::DrawingArea;
use gtk::prelude::*;
use mlua::{Error, Function, LightUserData};
@ -146,21 +146,23 @@ impl Module<gtk::Box> for CairoModule {
let path = self.path.clone();
area.connect_draw(move |_, cr| {
let function: Function = lua
.load(include_str!("../../lua/draw.lua"))
.eval()
.expect("to be valid");
let function: Function = lua
.load(include_str!("../../lua/draw.lua"))
.eval()
.expect("to be valid");
area.connect_draw(move |_, cr| {
if let Err(err) = cr.set_source_surface(&surface, 0.0, 0.0) {
error!("{err}");
return Propagation::Stop;
}
let ptr = unsafe { cr.clone().into_glib_ptr().cast() };
let ptr = cr.to_glib_full();
// mlua needs a valid return type, even if we don't return anything
if let Err(err) = function.call::<Option<bool>>((id.as_str(), LightUserData(ptr))) {
if let Err(err) =
function.call::<Option<bool>>((id.as_str(), LightUserData(ptr.cast())))
{
if let Error::RuntimeError(message) = err {
let message = message.split_once("]:").expect("to exist").1;
error!("[lua runtime error] {}:{message}", path.display());
@ -171,6 +173,10 @@ impl Module<gtk::Box> for CairoModule {
return Propagation::Stop;
}
unsafe {
cairo::ffi::cairo_destroy(ptr);
}
Propagation::Proceed
});
}