kms: Support screen filters

Author: Drakulix

src/backend/kms/device.rs

@@ -2,7 +2,7 @@
 
 use crate::{
     backend::render::{output_elements, CursorMode, GlMultiRenderer, CLEAR_COLOR},
-    config::{AdaptiveSync, OutputConfig, OutputState},
+    config::{AdaptiveSync, OutputConfig, OutputState, ScreenFilter},
     shell::Shell,
     utils::prelude::*,
     wayland::protocols::screencopy::Frame as ScreencopyFrame,
@@ -272,6 +272,7 @@ impl State {
                     maybe_crtc,
                     (w, 0),
                     &self.common.event_loop_handle,
+                    self.common.config.dynamic_conf.screen_filter().clone(),
                     self.common.shell.clone(),
                     self.common.startup_done.clone(),
                 ) {
@@ -365,6 +366,7 @@ impl State {
                         maybe_crtc,
                         (w, 0),
                         &self.common.event_loop_handle,
+                        self.common.config.dynamic_conf.screen_filter().clone(),
                         self.common.shell.clone(),
                         self.common.startup_done.clone(),
                     ) {
@@ -516,6 +518,7 @@ impl Device {
         maybe_crtc: Option<crtc::Handle>,
         position: (u32, u32),
         evlh: &LoopHandle<'static, State>,
+        screen_filter: ScreenFilter,
         shell: Arc<RwLock<Shell>>,
         startup_done: Arc<AtomicBool>,
     ) -> Result<(Output, bool)> {
@@ -579,6 +582,7 @@ impl Device {
                     self.dev_node,
                     self.render_node,
                     evlh,
+                    screen_filter,
                     shell,
                     startup_done,
                 ) {

src/backend/kms/mod.rs

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 use crate::{
-    config::{AdaptiveSync, OutputState},
+    config::{AdaptiveSync, OutputState, ScreenFilter},
     shell::Shell,
     state::BackendData,
     utils::prelude::*,
@@ -558,6 +558,7 @@ impl KmsState {
         &mut self,
         test_only: bool,
         loop_handle: &LoopHandle<'static, State>,
+        screen_filter: &ScreenFilter,
         shell: Arc<RwLock<Shell>>,
         startup_done: Arc<AtomicBool>,
         clock: &Clock<Monotonic>,
@@ -658,6 +659,7 @@ impl KmsState {
                         Some(crtc),
                         (w, 0),
                         loop_handle,
+                        screen_filter.clone(),
                         shell.clone(),
                         startup_done.clone(),
                     )?;
@@ -927,4 +929,19 @@ impl KmsState {
 
         Ok(all_outputs)
     }
+
+    pub fn update_screen_filter(&mut self, screen_filter: &ScreenFilter) -> Result<()> {
+        for device in self.drm_devices.values_mut() {
+            for surface in device.surfaces.values_mut() {
+                surface.set_screen_filter(screen_filter.clone());
+            }
+        }
+
+        // We don't expect this to fail in a meaningful way.
+        // The shader is already compiled at this point and we don't rely on any features,
+        // that might not be available for any filters we currently expose.
+        //
+        // But we might conditionally fail here in the future.
+        Ok(())
+    }
 }