Implement fading

src/image_provider.rs

@@ -1,28 +1,34 @@
 use crate::dimensions::{calculate_resize_dimensions, Dimensions};
 use image::ImageReader;
-use macroquad::texture::Texture2D;
+use macroquad::texture::{Image, Texture2D};
 use std::path::{Path, PathBuf};
 use walkdir::WalkDir;
 
 pub struct ImageProvider<'a> {
     path: &'a Path,
     directory_it: Box<dyn Iterator<Item = Result<walkdir::DirEntry, walkdir::Error>>>,
+    image: Option<Image>,
     texture: Option<Texture2D>,
+    texture_darkening_factor: f32,
     screen_dimension: Dimensions,
 }
 
 impl<'a> ImageProvider<'a> {
     pub fn new(screen_dimension: Dimensions, path: &'a Path) -> Self {
         Self {
-            directory_it: Box::new(WalkDir::new(&path).max_open(8).into_iter()),
+            directory_it: Box::new(WalkDir::new(path).max_open(8).into_iter()),
+            image: None,
             texture: None,
             screen_dimension,
             path,
+            texture_darkening_factor: 1.0f32,
         }
     }
 
     pub fn load_next_image(&mut self) -> anyhow::Result<()> {
         let path = self.get_next_image_path()?;
+        println!("Loading image: {path:?}");
+        let now = chrono::Local::now().time();
         let image = ImageReader::open(path)?.decode()?;
 
         let image_dim = Dimensions::new(image.width(), image.height());
@@ -34,19 +40,51 @@ impl<'a> ImageProvider<'a> {
             image::imageops::FilterType::Lanczos3,
         );
 
-        self.texture = Some(Texture2D::from_rgba8(
-            image.width().try_into()?,
-            image.height().try_into()?,
-            &image.into_rgba8(),
-        ));
+        let mut i = Image::empty();
+        i.width = image.width() as u16;
+        i.height = image.height() as u16;
+        i.bytes = image.into_rgba8().into_raw();
+
+        self.image = Some(i);
+        self.texture = None;
+
+        let elapsed = chrono::Local::now().time() - now;
+        println!(
+            "Loading image elapsed time: {}ms",
+            elapsed.num_milliseconds()
+        );
 
         Ok(())
     }
 
-    pub fn get_current_texture(&self) -> anyhow::Result<&Texture2D> {
-        self.texture
-            .as_ref()
-            .ok_or_else(|| anyhow::anyhow!("No image loaded"))
+    pub fn get_current_texture(&mut self, darkening_factor: f32) -> anyhow::Result<&Texture2D> {
+        if (darkening_factor - self.texture_darkening_factor).abs() > f32::EPSILON {
+            self.texture_darkening_factor = darkening_factor;
+            self.texture = None;
+        }
+
+        if self.texture.is_none() {
+            let darken_image = self
+                .image
+                .as_ref()
+                .map(|i| {
+                    let mut darken_image = i.clone();
+                    darken_image.bytes.iter_mut().for_each(|b| {
+                        *b = (f32::from(*b) * darkening_factor) as u8;
+                    });
+                    darken_image
+                })
+                .ok_or_else(|| anyhow::anyhow!("No image loaded"))?;
+
+            let text =
+                Texture2D::from_rgba8(darken_image.width, darken_image.height, &darken_image.bytes);
+            self.texture = Some(text);
+        }
+
+        match self.texture {
+            Some(ref texture) => Ok(texture),
+            None => Err(anyhow::anyhow!("No texture available")),
+        }
     }
 
     fn get_next_image_path(&mut self) -> anyhow::Result<PathBuf> {
@@ -65,7 +103,7 @@ impl<'a> ImageProvider<'a> {
                 Some(Err(e)) => return Err(e.into()),
                 None => {
                     // Reset the iterator when we reach the end
-                    self.directory_it = Box::new(WalkDir::new(&self.path).max_open(8).into_iter());
+                    self.directory_it = Box::new(WalkDir::new(self.path).max_open(8).into_iter());
                 }
             }
         }

src/main.rs

@@ -31,11 +31,6 @@ fn display_image_centered(texture: &Texture2D) {
     );
 }
 
-enum Mode {
-    Black,
-    Displayed,
-}
-
 #[macroquad::main(window_conf)]
 async fn main() -> anyhow::Result<()> {
     let settings = settings::Settings::new("settings.yml".into())?;
@@ -51,37 +46,38 @@ async fn main() -> anyhow::Result<()> {
         }
 
         let now = chrono::Local::now().time();
+        let start_fading = chrono::NaiveTime::from_hms_opt(22, 45, 0).unwrap();
         let go_to_bed = chrono::NaiveTime::from_hms_opt(23, 0, 0).unwrap();
         let wake_up = chrono::NaiveTime::from_hms_opt(9, 0, 0).unwrap();
+        let full_brightness = chrono::NaiveTime::from_hms_opt(9, 15, 0).unwrap();
 
-        let mode = if now < go_to_bed && now > wake_up {
-            Mode::Displayed
+        let darkening_factor = if now < start_fading && now > full_brightness {
+            1.0f32
+        } else if now > start_fading && now < go_to_bed {
+            (go_to_bed - now).num_seconds() as f32 / (go_to_bed - start_fading).num_seconds() as f32
+        } else if now > wake_up && now < full_brightness {
+            (now - wake_up).num_seconds() as f32 / (full_brightness - wake_up).num_seconds() as f32
         } else {
-            Mode::Black
+            0.0f32
         };
 
-        match mode {
-            Mode::Black => {
-                clear_background(BLACK);
-            }
-            Mode::Displayed => {
-                display_frame(&provider)?;
-                if time.elapsed() > settings.duration {
-                    provider.load_next_image()?;
-                    time = Instant::now();
-                }
+        display_frame(&mut provider, darkening_factor)?;
+        if time.elapsed() > settings.duration {
+            if darkening_factor > 0.0f32 {
+                provider.load_next_image()?;
             }
+            time = Instant::now();
         }
 
-        thread::sleep(Duration::from_millis(250));
+        thread::sleep(Duration::from_millis(400));
         next_frame().await;
     }
 
     Ok(())
 }
 
-fn display_frame(provider: &ImageProvider) -> anyhow::Result<()> {
-    let image = provider.get_current_texture()?;
+fn display_frame(provider: &mut ImageProvider, darkening_factor: f32) -> anyhow::Result<()> {
+    let image = provider.get_current_texture(darkening_factor)?;
     clear_background(BLACK);
     display_image_centered(image);
 

src/settings.rs

@@ -11,7 +11,7 @@ impl Settings {
             .add_source(File::from(settings_file))
             .build()?;
 
-        let photo_path = settings.get_string("photo_path")?.try_into()?;
+        let photo_path = settings.get_string("photo_path")?.into();
         let duration = settings.get_int("duration")?;
 
         Ok(Self {