Add Mod+Ctrl+Shift+T to toggle debug tint

README.md

@@ -83,6 +83,7 @@ The general system is: if a hotkey switches somewhere, then adding <kbd>Ctrl</kb
 | <kbd>Mod</kbd><kbd>F</kbd> | Maximize column |
 | <kbd>Mod</kbd><kbd>Shift</kbd><kbd>F</kbd> | Toggle full-screen on the focused window |
 | <kbd>Mod</kbd><kbd>PrtSc</kbd> | Save a screenshot to `~/Pictures/Screenshots/` |
+| <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>Shift</kbd><kbd>T</kbd> | Toggle debug tinting of rendered elements |
 | <kbd>Mod</kbd><kbd>Shift</kbd><kbd>E</kbd> | Exit niri |
 
 [PaperWM]: https://github.com/paperwm/PaperWM

src/input.rs

@@ -25,6 +25,7 @@ enum Action {
     Quit,
     ChangeVt(i32),
     Suspend,
+    ToggleDebugTint,
     Spawn(String),
     Screenshot,
     CloseWindow,
@@ -60,6 +61,7 @@ pub enum BackendAction {
     ChangeVt(i32),
     Suspend,
     Screenshot,
+    ToggleDebugTint,
 }
 
 pub enum CompositorMod {
@@ -110,6 +112,7 @@ fn action(comp_mod: CompositorMod, keysym: KeysymHandle, mods: ModifiersState) -
         KEY_n => Action::Spawn("nautilus".to_owned()),
         // Alt + PrtSc = SysRq
         KEY_Sys_Req | KEY_Print => Action::Screenshot,
+        KEY_T if mods.shift && mods.ctrl => Action::ToggleDebugTint,
         KEY_q => Action::CloseWindow,
         KEY_F => Action::ToggleFullscreen,
         KEY_comma => Action::ConsumeIntoColumn,
@@ -193,6 +196,9 @@ impl Niri {
                         Action::Suspend => {
                             return BackendAction::Suspend;
                         }
+                        Action::ToggleDebugTint => {
+                            return BackendAction::ToggleDebugTint;
+                        }
                         Action::Spawn(command) => {
                             if let Err(err) = Command::new(command).spawn() {
                                 warn!("error spawning alacritty: {err}");

src/tty.rs

@@ -12,7 +12,7 @@ use smithay::backend::drm::{DrmDevice, DrmDeviceFd, DrmEvent, DrmEventTime};
 use smithay::backend::egl::{EGLContext, EGLDisplay};
 use smithay::backend::libinput::{LibinputInputBackend, LibinputSessionInterface};
 use smithay::backend::renderer::gles::{GlesRenderer, GlesTexture};
-use smithay::backend::renderer::{Bind, ImportEgl};
+use smithay::backend::renderer::{Bind, DebugFlags, ImportEgl};
 use smithay::backend::session::libseat::LibSeatSession;
 use smithay::backend::session::{Event as SessionEvent, Session};
 use smithay::backend::udev::{self, UdevBackend, UdevEvent};
@@ -192,6 +192,14 @@ impl Tty {
                             }
                         }
                     }
+                    BackendAction::ToggleDebugTint => {
+                        if let Some(device) = tty.output_device.as_mut() {
+                            for (_, compositor) in &mut device.surfaces {
+                                compositor
+                                    .set_debug_flags(compositor.debug_flags() ^ DebugFlags::TINT);
+                            }
+                        }
+                    }
                 };
             })
             .unwrap();

src/winit.rs

@@ -2,6 +2,7 @@ use std::time::Duration;
 
 use smithay::backend::renderer::damage::OutputDamageTracker;
 use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::backend::renderer::{DebugFlags, Renderer};
 use smithay::backend::winit::{self, WinitError, WinitEvent, WinitEventLoop, WinitGraphicsBackend};
 use smithay::output::{Mode, Output, PhysicalProperties, Subpixel};
 use smithay::reexports::calloop::timer::{TimeoutAction, Timer};
@@ -158,6 +159,9 @@ impl Winit {
                                 }
                             }
                         }
+                        BackendAction::ToggleDebugTint => {
+                            renderer.set_debug_flags(renderer.debug_flags() ^ DebugFlags::TINT);
+                        }
                     }
                 }
                 WinitEvent::Focus(_) => (),