hammond-gtk::utils: change the signature of get_pixbug_from_path and rename it

Requires a gtk::Image as argument now, it sets the pixbuf to the
img directly instead of returning it.
New name is set_image_from_path.

This is ground work so we can later keep the image reference, and
use it to set the image with a callback.

hammond-gtk/src/utils.rs

@@ -1,8 +1,11 @@
 #![cfg_attr(feature = "cargo-clippy", allow(type_complexity))]
 
-use failure::Error;
 use gdk_pixbuf::Pixbuf;
 use gio::{Settings, SettingsExt};
+use gtk;
+use gtk::prelude::*;
+
+use failure::Error;
 use regex::Regex;
 use reqwest;
 use send_cell::SendCell;
@@ -137,7 +140,11 @@ lazy_static! {
 // GObjects do not implement Send trait, so SendCell is a way around that.
 // Also lazy_static requires Sync trait, so that's what the mutexes are.
 // TODO: maybe use something that would just scale to requested size?
-pub fn get_pixbuf_from_path(pd: &PodcastCoverQuery, size: u32) -> Result<Pixbuf, Error> {
+pub fn set_image_from_path(
+    image: &gtk::Image,
+    pd: &PodcastCoverQuery,
+    size: u32,
+) -> Result<(), Error> {
     {
         let hashmap = CACHED_PIXBUFS
             .read()
@@ -145,7 +152,9 @@ pub fn get_pixbuf_from_path(pd: &PodcastCoverQuery, size: u32) -> Result<Pixbuf,
         if let Some(px) = hashmap.get(&(pd.id(), size)) {
             let m = px.lock()
                 .map_err(|_| format_err!("Failed to lock pixbuf mutex."))?;
-            return Ok(m.clone().into_inner());
+            let px = m.clone().into_inner();
+            image.set_from_pixbuf(&px);
+            return Ok(());
         }
     }
 
@@ -155,7 +164,8 @@ pub fn get_pixbuf_from_path(pd: &PodcastCoverQuery, size: u32) -> Result<Pixbuf,
         .write()
         .map_err(|_| format_err!("Failed to lock pixbuf mutex."))?;
     hashmap.insert((pd.id(), size), Mutex::new(SendCell::new(px.clone())));
-    Ok(px)
+    image.set_from_pixbuf(&px);
+    Ok(())
 }
 
 #[inline]

hammond-gtk/src/views/episodes.rs

@@ -7,7 +7,7 @@ use hammond_data::EpisodeWidgetQuery;
 use hammond_data::dbqueries;
 
 use app::Action;
-use utils::{get_ignored_shows, get_pixbuf_from_path};
+use utils::{get_ignored_shows, set_image_from_path};
 use widgets::EpisodeWidget;
 
 use std::sync::mpsc::Sender;
@@ -228,8 +228,6 @@ impl EpisodesViewWidget {
 
     fn set_cover(&self, podcast_id: i32) -> Result<(), Error> {
         let pd = dbqueries::get_podcast_cover_from_id(podcast_id)?;
-        let img = get_pixbuf_from_path(&pd, 64)?;
+        set_image_from_path(&self.image, &pd, 64)
-        self.image.set_from_pixbuf(&img);
-        Ok(())
     }
 }

hammond-gtk/src/views/shows.rs

@@ -6,7 +6,7 @@ use hammond_data::Podcast;
 use hammond_data::dbqueries;
 
 use app::Action;
-use utils::{get_ignored_shows, get_pixbuf_from_path};
+use utils::{get_ignored_shows, set_image_from_path};
 
 use std::sync::Arc;
 use std::sync::mpsc::Sender;
@@ -133,8 +133,6 @@ impl ShowsChild {
     }
 
     fn set_cover(&self, pd: Arc<Podcast>) -> Result<(), Error> {
-        let image = get_pixbuf_from_path(&pd.clone().into(), 256)?;
+        set_image_from_path(&self.cover, &pd.clone().into(), 256)
-        self.cover.set_from_pixbuf(&image);
-        Ok(())
     }
 }

hammond-gtk/src/widgets/show.rs

@@ -10,7 +10,7 @@ use hammond_data::dbqueries;
 use hammond_data::utils::replace_extra_spaces;
 
 use app::Action;
-use utils::get_pixbuf_from_path;
+use utils::set_image_from_path;
 use widgets::episode::episodes_listbox;
 
 use std::sync::Arc;
@@ -113,9 +113,7 @@ impl ShowWidget {
 
     /// Set the show cover.
     fn set_cover(&self, pd: Arc<Podcast>) -> Result<(), Error> {
-        let image = get_pixbuf_from_path(&pd.into(), 128)?;
+        set_image_from_path(&self.cover, &pd.into(), 128)
-        self.cover.set_from_pixbuf(&image);
-        Ok(())
     }
 
     /// Set the descripton text.