feature: add new image format + small fixes on the rendering of the images

television/preview/previewers/files.rs

@@ -255,39 +255,58 @@ pub fn try_preview(
             entry.name.clone(),
             &meta::loading(&format!("Loading {}", entry.name)),
         );
+
         debug!("File {:?} is an image", entry.name);
-        match ImageReader::open(path).unwrap().decode() {
-            Ok(image) => {
-                let preview_window_dimension = preview_window.map(|rect| {
-                    (u32::from(rect.width), u32::from(rect.height))
-                });
-                let image_preview_widget =
-                    ImagePreviewWidget::from_dynamic_image(
-                        image,
-                        preview_window_dimension,
+        let option_image = match ImageReader::open(path) {
+            Ok(reader) => match reader.with_guessed_format() {
+                Ok(reader) => match reader.decode() {
+                    Ok(image) => Some(image),
+                    Err(e) => {
+                        warn!(
+                            "Error impossible to decode {}: {:?}",
+                            entry.name, e
+                        );
+                        None
+                    }
+                },
+                Err(e) => {
+                    warn!(
+                        "Error impossible to guess the format of {}: {:?}",
+                        entry.name, e
                     );
-                let total_lines = image_preview_widget
-                    .height()
-                    .try_into()
-                    .unwrap_or(u16::MAX);
-                let content = PreviewContent::Image(image_preview_widget);
-                let preview = Arc::new(Preview::new(
-                    entry.name.clone(),
-                    content,
-                    entry.icon,
-                    None,
-                    total_lines,
-                ));
-                cache.lock().insert(entry.name.clone(), &preview);
-            }
+                    None
+                }
+            },
             Err(e) => {
-                warn!("Error opening file: {:?}", e);
-                let p = meta::not_supported(&entry.name);
-                cache.lock().insert(entry.name.clone(), &p);
+                warn!("Error opening image {}: {:?}", entry.name, e);
+                None
             }
+        };
+        if let Some(image) = option_image {
+            let preview_window_dimension = preview_window.map(|rect| {
+                (u32::from(rect.width - 2), u32::from(rect.height - 2)) // - 2 for the marge
+            });
+            let image_preview_widget = ImagePreviewWidget::from_dynamic_image(
+                image,
+                preview_window_dimension,
+            );
+            let total_lines =
+                image_preview_widget.height().try_into().unwrap_or(u16::MAX);
+            let content = PreviewContent::Image(image_preview_widget);
+            let preview = Arc::new(Preview::new(
+                entry.name.clone(),
+                content,
+                entry.icon,
+                None,
+                total_lines,
+            ));
+            cache.lock().insert(entry.name.clone(), &preview);
+        } else {
+            let p = meta::not_supported(&entry.name);
+            cache.lock().insert(entry.name.clone(), &p);
         }
     } else {
-        debug!("File isn't text-based: {:?}", entry.name);
+        debug!("File format isn't supported for preview: {:?}", entry.name);
         let preview = meta::not_supported(&entry.name);
         cache.lock().insert(entry.name.clone(), &preview);
     }

television/utils/files.rs

@@ -118,12 +118,12 @@ where
     fn from(path: P) -> Self {
         debug!("Getting file type for {:?}", path);
         let p = path.as_ref();
-        if is_known_text_extension(p) {
-            return FileType::Text;
-        }
         if is_accepted_image_extension(p) {
             return FileType::Image;
         }
+        if is_known_text_extension(p) {
+            return FileType::Text;
+        }
         if let Ok(mut f) = File::open(p) {
             let mut buffer = [0u8; 256];
             if let Ok(bytes_read) = f.read(&mut buffer) {
@@ -506,16 +506,10 @@ pub static KNOWN_IMAGE_FILE_EXTENSIONS: OnceLock<FxHashSet<&'static str>> =
 pub fn get_known_image_file_extensions() -> &'static FxHashSet<&'static str> {
     KNOWN_IMAGE_FILE_EXTENSIONS.get_or_init(|| {
         [
-            //"avif",
-            //"bmp",
-            //"dds",
-            //"farbfeld",
-            "gif", //"hdr",
-            "ico", "jpeg", "jpg", //"exr",
-            "png", //"pnm",
-            //"qoi",
-            //"tga",
-            "tif", "tiff", "webp",
+            // "avif", requires the avif-native feature, uses the libdav1d C library.
+            // dds, dosen't work for some reason
+            "bmp", "ff", "gif", "hdr", "ico", "jpeg", "jpg", "exr", "png",
+            "pnm", "qoi", "tga", "tif", "webp",
         ]
         .iter()
         .copied()

television/utils/image.rs

@@ -8,7 +8,7 @@ use std::fmt::Debug;
 use std::hash::Hash;
 
 static PIXEL_STRING: &str = "▀";
-const FILTER_TYPE: FilterType = FilterType::Triangle;
+const FILTER_TYPE: FilterType = FilterType::Lanczos3;
 
 // use to reduce the size of the image before storing it
 const DEFAULT_CACHED_WIDTH: u32 = 50;
@@ -28,7 +28,7 @@ impl Widget for &ImagePreviewWidget {
         let width = self.width();
         // offset of the left top corner where the image is centered
         let total_width = usize::from(area.width) + 2 * usize::from(area.x);
-        let x_offset = total_width.saturating_sub(width) / 2;
+        let x_offset = total_width.saturating_sub(width) / 2 + 1;
         let total_height = usize::from(area.height) + 2 * usize::from(area.y);
         let y_offset = total_height.saturating_sub(height) / 2;
 
@@ -42,7 +42,8 @@ impl Widget for &ImagePreviewWidget {
                 for (x, cell) in row.iter().enumerate() {
                     let pos_x =
                         u16::try_from(x_offset + x).unwrap_or(u16::MAX);
-                    if pos_x >= area_border_left && pos_x < area_border_right {
+                    if pos_x >= area_border_left && pos_x <= area_border_right
+                    {
                         if let Some(buf_cell) =
                             buf.cell_mut(Position::new(pos_x, pos_y))
                         {
@@ -74,29 +75,28 @@ impl ImagePreviewWidget {
         dynamic_image: DynamicImage,
         dimension: Option<(u32, u32)>,
     ) -> Self {
-        // first quick resize
         let (window_width, window_height) =
             dimension.unwrap_or((DEFAULT_CACHED_WIDTH, DEFAULT_CACHED_HEIGHT));
-        let big_resized_image = if dynamic_image.width() > window_width * 4
-            || dynamic_image.height() > window_height * 4
+        let (max_width, max_height) = (window_width, window_height * 2 - 2); // -2 to have some space with the title
+
+        // first quick resize
+        let big_resized_image = if dynamic_image.width() > max_width * 4
+            || dynamic_image.height() > max_height * 4
         {
             dynamic_image.resize(
-                window_width * 4,
-                window_height * 4,
+                max_width * 4,
+                max_height * 4,
                 FilterType::Nearest,
             )
         } else {
             dynamic_image
         };
+
         // this time resize with the filter
-        let resized_image = if big_resized_image.width() > window_width
-            || big_resized_image.height() > window_height
+        let resized_image = if big_resized_image.width() > max_width
+            || big_resized_image.height() > max_height
         {
-            big_resized_image.resize(
-                window_width,
-                DEFAULT_CACHED_HEIGHT,
-                FILTER_TYPE,
-            )
+            big_resized_image.resize(max_width, max_height, FILTER_TYPE)
         } else {
             big_resized_image
         };