eframe::App::post_rendering (#1591)

eframe/src/epi.rs

@@ -141,6 +141,11 @@ pub trait App {
     fn warm_up_enabled(&self) -> bool {
         false
     }
+
+    /// Called each time after the rendering the UI.
+    ///
+    /// Can be used to access pixel data with `get_pixels`
+    fn post_rendering(&mut self, _window_size_px: [u32; 2], _frame: &Frame) {}
 }
 
 /// Options controlling the behavior of a native window.

eframe/src/native/epi_integration.rs

@@ -299,6 +299,13 @@ impl EpiIntegration {
         full_output
     }
 
+    pub fn post_rendering(&mut self, app: &mut dyn epi::App, window: &winit::window::Window) {
+        let inner_size = window.inner_size();
+        let window_size_px = [inner_size.width, inner_size.height];
+
+        app.post_rendering(window_size_px, &self.frame);
+    }
+
     pub fn handle_platform_output(
         &mut self,
         window: &winit::window::Window,

eframe/src/native/run.rs

@@ -126,6 +126,8 @@ pub fn run_glow(
                 &textures_delta,
             );
 
+            integration.post_rendering(app.as_mut(), window);
+
             {
                 crate::profile_scope!("swap_buffers");
                 gl_window.swap_buffers().unwrap();