fix: setting the target with canvas now waits for valid dimensions

This fixes drawing and it waits up to 5000ms

Author: Torwent

src/shared/memory.rs

@@ -1,5 +1,9 @@
 use lazy_static::lazy_static;
-use std::sync::Mutex;
+use std::{
+    sync::Mutex,
+    thread::sleep,
+    time::{Duration, Instant},
+};
 use windows::{
     core::PCSTR,
     Win32::{
@@ -121,6 +125,24 @@ impl MemoryManager {
         (*self.ptr).width = width;
         (*self.ptr).height = height;
     }
+
+    pub unsafe fn wait_dimensions(&self, time: u64) -> (i32, i32) {
+        let start = Instant::now();
+        let timeout = Duration::from_millis(time);
+
+        loop {
+            let (w, h) = self.get_dimensions();
+            if w > 0 && h > 0 {
+                return (w, h);
+            }
+
+            if start.elapsed() >= timeout {
+                panic!("[WaspInput]: Timeout waiting for valid dimensions!\r\n");
+            }
+
+            sleep(Duration::from_millis(100));
+        }
+    }
 }
 
 lazy_static! {

src/simba/target.rs

@@ -97,7 +97,7 @@ pub extern "C" fn SimbaPluginTarget_RequestWithDebugImage(
                 .external_image_set_memory
                 .expect("external_image_set_memory function pointer is null");
 
-            let (w, h) = mem_manager.get_dimensions();
+            let (w, h) = mem_manager.wait_dimensions(5000);
 
             let img = external_image_create(true);
             *overlay = img;