Refactor the handling of image color transform parameters

src/image.rs

@@ -18,14 +18,20 @@ use smithay_client_toolkit::reexports::client::protocol::wl_shm;
 
 use crate::wayland::WorkspaceBackground;
 
+#[derive(Clone, Copy, PartialEq)]
+pub enum ColorTransform {
+    // Levels { input_max: u8, input_min: u8, output_max: u8, output_min: u8 },
+    Legacy { brightness: i32, contrast: f32 },
+    None,
+}
+
 pub fn workspace_bgs_from_output_image_dir(
     dir_path: impl AsRef<Path>,
     slot_pool: &mut SlotPool,
     format: wl_shm::Format,
-    brightness: i32,
-    contrast: f32,
     width: u32,
     height: u32,
+    color_transform: ColorTransform,
 ) -> anyhow::Result<Vec<WorkspaceBackground>> {
     let mut buffers = Vec::new();
     let mut resizer = Resizer::new();
@@ -45,11 +51,10 @@ pub fn workspace_bgs_from_output_image_dir(
             entry_result,
             slot_pool,
             format,
-            brightness,
-            contrast,
             width,
             height,
             stride,
+            color_transform,
             &mut resizer
         ) {
             Ok(Some(workspace_bg)) => buffers.push(workspace_bg),
@@ -71,11 +76,10 @@ fn workspace_bg_from_file(
     dir_entry_result: io::Result<DirEntry>,
     slot_pool: &mut SlotPool,
     format: wl_shm::Format,
-    brightness: i32,
-    contrast: f32,
     width: u32,
     height: u32,
     stride: usize,
+    color_transform: ColorTransform,
     resizer: &mut Resizer,
 ) -> anyhow::Result<Option<WorkspaceBackground>> {
     let entry = dir_entry_result.context("Failed to read direectory")?;
@@ -91,11 +95,6 @@ fn workspace_bg_from_file(
         stride.try_into().unwrap(),
         format,
     ).context("Failed to create Wayland shared memory buffer")?;
-    let color_transform = if brightness == 0 && contrast == 0.0 {
-        ColorTransform::None
-    } else {
-        ColorTransform::Legacy { brightness, contrast }
-    };
     load_wallpaper(
         &path,
         &mut canvas[..stride * height as usize],
@@ -109,13 +108,6 @@ fn workspace_bg_from_file(
     Ok(Some(WorkspaceBackground { workspace_name, buffer }))
 }
 
-#[derive(Clone, Copy, PartialEq)]
-pub enum ColorTransform {
-    // Levels { input_max: u8, input_min: u8, output_max: u8, output_min: u8 },
-    Legacy { brightness: i32, contrast: f32 },
-    None,
-}
-
 fn load_wallpaper(
     path: &Path,
     dst: &mut [u8],

src/main.rs

@@ -40,6 +40,7 @@ use smithay_client_toolkit::reexports::protocols
 use crate::{
     cli::{Cli, PixelFormat},
     compositors::{Compositor, ConnectionTask, WorkspaceVisible},
+    image::ColorTransform,
     poll::{Poll, Waker},
     signal::SignalPipe,
     wayland::BackgroundLayer,
@@ -57,8 +58,7 @@ pub struct State {
     pub pixel_format: Option<wl_shm::Format>,
     pub background_layers: Vec<BackgroundLayer>,
     pub compositor_connection_task: ConnectionTask,
-    pub brightness: i32,
-    pub contrast: f32,
+    pub color_transform: ColorTransform,
 }
 
 impl State {
@@ -103,6 +103,13 @@ fn run() -> anyhow::Result<()> {
 
     let cli = Cli::parse();
     let wallpaper_dir = Path::new(&cli.wallpaper_dir).canonicalize().unwrap();
+    let brightness = cli.brightness.unwrap_or(0);
+    let contrast = cli.contrast.unwrap_or(0.0);
+    let color_transform = if brightness == 0 && contrast == 0.0 {
+        ColorTransform::None
+    } else {
+        ColorTransform::Legacy { brightness, contrast }
+    };
 
     // ********************************
     //     Initialize wayland client
@@ -145,8 +152,7 @@ fn run() -> anyhow::Result<()> {
             compositor,
             tx.clone(), Arc::clone(&waker)
         ),
-        brightness: cli.brightness.unwrap_or(0),
-        contrast: cli.contrast.unwrap_or(0.0),
+        color_transform,
     };
 
     event_queue.roundtrip(&mut state).unwrap();

src/wayland.rs

@@ -276,10 +276,9 @@ logical size: {}x{}, transform: {:?}",
             &output_wallpaper_dir,
             &mut shm_slot_pool,
             pixel_format,
-            self.brightness,
-            self.contrast,
             width.try_into().unwrap(),
-            height.try_into().unwrap()
+            height.try_into().unwrap(),
+            self.color_transform,
         ) {
             Ok(workspace_bgs) => {
                 debug!(