image_page: Specific error for file loading

Give a specific error message if loading the source file fails.

Closes #487

Cargo.lock

@@ -881,8 +881,7 @@ dependencies = [
 [[package]]
 name = "glycin"
 version = "3.0.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://gitlab.gnome.org/GNOME/glycin#f34faa00c480b7809ceb8503ec85282446206277"
-checksum = "502ac59dc785b95521e7deea20e292f3501a11752600c4f37cf34676f794b4e3"
 dependencies = [
  "async-fs",
  "async-global-executor",
@@ -918,8 +917,7 @@ dependencies = [
 [[package]]
 name = "glycin-common"
 version = "1.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://gitlab.gnome.org/GNOME/glycin#f34faa00c480b7809ceb8503ec85282446206277"
-checksum = "6e9b31c7fa5ccb9d91317c956e767daef59be9fee3ae9df30468470368678482"
 dependencies = [
  "bitflags",
  "gufo-common",
@@ -937,8 +935,7 @@ dependencies = [
 [[package]]
 name = "glycin-utils"
 version = "4.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://gitlab.gnome.org/GNOME/glycin#f34faa00c480b7809ceb8503ec85282446206277"
-checksum = "7dfec0cd29d5ecfb1dd723868e22e2c49441020f35d5f14307018ff0a1679e2f"
 dependencies = [
  "async-lock",
  "bitflags",

Cargo.toml

@@ -27,7 +27,10 @@ chrono = { version = "0.4.38", default-features = false, features = ["std"] }
 gettext-rs = { version = "0.7.0", features = ["gettext-system"] }
 gettext-sys = { version = "0.26.0", features = ["gettext-system"] }
 gio = { version = "0.21.0", features = ["v2_74"] }
-glycin = { version = "3.0.4", features = ["gdk4", "unstable-config"] }
+glycin = { version = "3.0.4", features = [
+    "gdk4",
+    "unstable-config",
+], git = "https://gitlab.gnome.org/GNOME/glycin" }
 gtk = { package = "gtk4", version = "0.10.0", features = [
     "v4_14",
     "xml_validation",

news.d/50.alpha/added-error-message-file-loading

@@ -0,0 +1 @@
+Add a specific error message when loading the image file fails. Usually when the file does not exists or there are no rights to access the file.

src/decoder.rs

@@ -59,32 +59,21 @@ pub enum DecoderUpdate {
     Redraw,
     /// Start animation
     Animated,
-    Error(DecoderError),
+    Error(Option<DecoderError>),
 }
 
-#[derive(Debug, Clone, Default, PartialEq, Eq)]
+#[derive(Debug, Clone)]
 pub enum DecoderError {
     /// Image format not supported or unknown
-    UnsupportedFormat,
+    UnsupportedFormat(String, glycin::ErrorCtx),
     /// No glycin-loaders installed
-    NoLoadersConfigured,
+    NoLoadersConfigured(glycin::ErrorCtx),
     /// Memory limit exceeded
-    OutOfMemory,
+    OutOfMemory(glycin::ErrorCtx),
+    /// Failed to load image
+    ImageSource(glib::Error, glycin::ErrorCtx),
 
-    Generic(String),
+    Generic(glycin::ErrorCtx),
-    //ImageSource(String),
-    #[default]
-    None,
-}
-
-impl DecoderError {
-    pub fn is_err(&self) -> bool {
-        matches!(self, Self::None)
-    }
-
-    pub fn is_ok(&self) -> bool {
-        !matches!(self, Self::None)
-    }
 }
 
 impl UpdateSender {
@@ -116,27 +105,34 @@ impl UpdateSender {
     }
 
     pub fn send_error(&self, err: glycin::ErrorCtx) {
-        dbg!(&err);
         if let Some(mime_type) = err.unsupported_format() {
             let mut metadata = Metadata::default();
-            metadata.set_mime_type(mime_type);
+            metadata.set_mime_type(mime_type.clone());
 
             self.send(DecoderUpdate::Metadata(Box::new(metadata)));
-            self.send(DecoderUpdate::Error(DecoderError::UnsupportedFormat));
+            self.send(DecoderUpdate::Error(Some(DecoderError::UnsupportedFormat(
-        }
+                mime_type, err,
-        if err.is_out_of_memory() {
+            ))));
-            self.send(DecoderUpdate::Error(DecoderError::OutOfMemory));
+        } else if err.is_out_of_memory() {
+            self.send(DecoderUpdate::Error(Some(DecoderError::OutOfMemory(err))));
         } else if matches!(err.error(), glycin::Error::NoLoadersConfigured(_)) {
-            self.send(DecoderUpdate::Error(DecoderError::NoLoadersConfigured));
+            self.send(DecoderUpdate::Error(Some(
+                DecoderError::NoLoadersConfigured(err),
+            )));
+        } else if let glycin::Error::ImageSource(glib_err) = err.error() {
+            self.send(DecoderUpdate::Error(Some(DecoderError::ImageSource(
+                glib_err.clone(),
+                err,
+            ))));
+        } else {
+            self.send(DecoderUpdate::Error(Some(DecoderError::Generic(err))));
         }
-        self.send(DecoderUpdate::Error(DecoderError::Generic(err.to_string())));
     }
 }
 
 #[derive(Debug)]
 pub struct Decoder {
     decoder: FormatDecoder,
-    update_sender: UpdateSender,
 }
 
 #[derive(Debug)]
@@ -171,7 +167,6 @@ impl Decoder {
                 return (
                     Self {
                         decoder: FormatDecoder::Failed,
-                        update_sender,
                     },
                     receiver,
                 );
@@ -182,7 +177,6 @@ impl Decoder {
 
         let decoder = Self {
             decoder: format_decoder,
-            update_sender,
         };
 
         (decoder, receiver)
@@ -209,8 +203,7 @@ impl Decoder {
     pub fn request(&self, tile_request: TileRequest) {
         if let FormatDecoder::Svg(svg) = &self.decoder {
             if let Err(err) = svg.request(tile_request) {
-                self.update_sender
+                tracing::error!("Failed to request new SVG tiles: {err}");
-                    .send(DecoderUpdate::Error(DecoderError::Generic(err.to_string())));
             }
         }
     }

src/widgets/image.rs

@@ -54,6 +54,7 @@ use glib::subclass::Signal;
 use glib::{Properties, SignalGroup};
 use gufo_common::orientation::Orientation;
 
+use crate::decoder::tiling::SharedFrameBuffer;
 use crate::decoder::{self, Decoder, DecoderUpdate, tiling};
 use crate::deps::*;
 use crate::metadata::Metadata;
@@ -137,13 +138,11 @@ pub enum FitMode {
     ExactVolatile,
 }
 
-mod imp {
+use decoder::DecoderError;
-    use decoder::DecoderError;
+use glycin::Operations;
-    use glycin::Operations;
 
+mod imp {
     use super::*;
-    use crate::decoder::tiling::SharedFrameBuffer;
-    use crate::editing;
 
     #[derive(Debug, Default, Properties)]
     #[properties(wrapper_type = super::LpImage)]
@@ -155,9 +154,9 @@ mod imp {
         #[property(get)]
         pub(super) is_deleted: Cell<bool>,
         /// Set if an error has occurred, shown on error_page
-        pub(super) specific_error: RefCell<DecoderError>,
+        pub(super) specific_error: RefCell<Option<DecoderError>>,
         #[property(get=Self::is_error)]
-        pub(super) is_error: Cell<bool>,
+        pub(super) is_error: PhantomData<bool>,
         /// Set to true when image is ready for displaying
         #[property(get)]
         pub(super) is_loaded: Cell<bool>,
@@ -257,7 +256,7 @@ mod imp {
         pub(super) nth_snapshot: Cell<u8>,
 
         /// Editing queue
-        pub(super) editing_queue: editing::Queue,
+        pub(super) editing_queue: crate::editing::Queue,
         pub(super) operations: RefCell<Option<Arc<Operations>>>,
     }
 

src/widgets/image/loading.rs

@@ -268,7 +268,7 @@ impl imp::LpImage {
     }
 
     pub(super) fn is_error(&self) -> bool {
-        self.specific_error.borrow().is_err()
+        self.specific_error.borrow().is_some()
     }
 
     fn set_loaded(&self, is_loaded: bool) {
@@ -279,7 +279,7 @@ impl imp::LpImage {
             obj.notify_is_loaded();
 
             if is_loaded {
-                obj.set_specific_error(DecoderError::None);
+                obj.set_specific_error(None);
             }
         }
     }
@@ -357,20 +357,19 @@ impl LpImage {
         imp.decoder.replace(Some(Arc::new(decoder)));
     }
 
-    pub fn specific_error(&self) -> DecoderError {
+    pub fn specific_error(&self) -> Option<DecoderError> {
         self.imp().specific_error.borrow().clone()
     }
 
-    pub fn set_specific_error(&self, error: DecoderError) {
+    pub fn set_specific_error(&self, error: Option<DecoderError>) {
         let imp = self.imp();
 
-        // Keeping first error instead of replacing with new error
+        // Keeping first error instead of replacing with new error or return
-        if error.is_err() && self.is_error() {
+        if error.is_some() == self.is_error() {
             return;
         }
 
-        if self.specific_error() != error {
+        let is_err = error.is_some();
-            let is_err = error.is_err();
         imp.specific_error.replace(error);
         self.notify_is_error();
 
@@ -378,5 +377,4 @@ impl LpImage {
             imp.set_loaded(false);
         }
     }
-    }
 }

src/widgets/image_page.rs

@@ -214,72 +214,79 @@ impl LpImagePage {
         let imp = self.imp();
         let image = self.image();
 
-        match image.specific_error() {
+        if let Some(error) = image.specific_error() {
-            DecoderError::NoLoadersConfigured => {
+            let details;
+            let description;
+
+            match error {
+                DecoderError::NoLoadersConfigured(err) => {
                     // Translators: {} is replaced with a version number
-                let message = gettext_f(
+                    description = gettext_f(
                         "No image loaders available. Maybe the “glycin-loaders” package with compatibility version “{}” is not installed.",
                         [format!("{}+", glycin::COMPAT_VERSION)],
                     );
 
-                imp.error_page.set_description(Some(&message));
+                    details = err.to_string();
-                imp.stack.set_visible_child(&*imp.error_page);
-                imp.error_more_info.set_visible(false);
                 }
-            DecoderError::UnsupportedFormat => {
+                DecoderError::UnsupportedFormat(mime_type, err) => {
-                let mime_type = image.metadata().mime_type().unwrap_or_default();
+                    let content_type =
-                let content_type = gio::content_type_from_mime_type(&mime_type).unwrap_or_default();
+                        gio::content_type_from_mime_type(&mime_type).unwrap_or_default();
-                let description = gio::content_type_get_description(&content_type).to_string();
+                    let mime_type_description =
+                        gio::content_type_get_description(&content_type).to_string();
 
-                let message = if glycin::Loader::DEFAULT_MIME_TYPES.contains(&mime_type.as_str()) {
+                    description =
-                    // Translators: The first occurance of {} is replace with a description of the
+                        if glycin::Loader::DEFAULT_MIME_TYPES.contains(&mime_type.as_str()) {
-                    // format and the second with an id (mime-type) of the format.
+                            // Translators: The first occurance of {} is replace with a description
+                            // of the format and the second with an id
+                            // (mime-type) of the format.
                             gettext_f(
                                 "The image format “{} ({})” is known but not installed.",
-                        [&description, &mime_type],
+                                [&mime_type_description, &mime_type],
                             )
                         } else {
-                    // Translators: The first occurance of {} is replace with a description of the
+                            // Translators: The first occurance of {} is replace with a description
-                    // format and the second with an id (mime-type) of the format.
+                            // of the format and the second with an id
+                            // (mime-type) of the format.
                             gettext_f(
                                 "Unknown image format “{} ({}).”",
-                        [&description, &mime_type],
+                                [&mime_type_description, &mime_type],
                             )
                         };
 
-                imp.error_more_info.connect_clicked(glib::clone!(
+                    details = err.to_string();
-                    #[weak(rename_to = obj)]
-                    self,
-                    move |_| {
-                        LpErrorDetails::new(&obj.root().unwrap(), &err, ErrorType::Loader);
                 }
-                ));
+                DecoderError::OutOfMemory(err) => {
-
+                    description =
-                imp.error_page.set_description(Some(&message));
+                        gettext("There is not enough free memory available to load this image.");
-                imp.stack.set_visible_child(&*imp.error_page);
+                    details = err.to_string();
+                }
+                DecoderError::ImageSource(glib_err, err) => {
+                    // Translators: The first occurance of {} is replace with a
+                    // translated, more detailled error message.
+                    description =
+                        gettext_f("Failed to load image file: {}", [&glib_err.to_string()]);
+                    details = err.to_string();
                 }
                 DecoderError::Generic(err) => {
+                    description = gettext(
+                        "Either the image file is corrupted or it contains unsupported elements.",
+                    );
+                    details = err.to_string();
+                }
+            }
+
             imp.error_more_info.connect_clicked(glib::clone!(
                 #[weak(rename_to = obj)]
                 self,
                 move |_| {
-                        LpErrorDetails::new(&obj.root().unwrap(), &err, ErrorType::Loader);
+                    LpErrorDetails::new(&obj.root().unwrap(), &details, ErrorType::Loader);
                 }
             ));
 
-                if matches!(image.specific_error(), DecoderError::OutOfMemory) {
+            imp.error_page.set_description(Some(&description));
-                    imp.error_page.set_description(Some(&gettext(
-                        "There is not enough free memory available to load this image.",
-                    )));
-                } else {
-                    imp.error_page.set_description(Some(&gettext(
-                        "Either the image file is corrupted or it contains unsupported elements.",
-                    )));
-                }
 
             imp.error_more_info.set_visible(true);
             imp.stack.set_visible_child(&*imp.error_page);
         }
     }
-    }
 }

src/widgets/image_view.rs

@@ -650,7 +650,10 @@ impl LpImageView {
             #[weak(rename_to = obj)]
             self,
             move |image| {
-                if matches!(image.specific_error(), DecoderError::UnsupportedFormat) {
+                if matches!(
+                    image.specific_error(),
+                    Some(DecoderError::UnsupportedFormat(_, _))
+                ) {
                     if obj.current_image().as_ref() == Some(image) {
                         tracing::debug!(
                             "Image format unsupported but not removing since current image"