Adding async picture load.

include/openmg/view/picture.h

@@ -1,4 +1,6 @@
 #pragma once
 #include <gtk/gtk.h>
-GtkPicture *
+void
-create_picture_from_url (char *url, gint picture_height);
+create_picture_from_url (const char *const url, gint picture_size,
+        GAsyncReadyCallback ready, gpointer source_object,
+        gpointer callback_data);

src/view/chapter_view.c

@@ -49,12 +49,15 @@ static void
 zoom_end (GtkGesture *zoom,
         GdkEventSequence *sequence,
         gpointer user_data);
+static void
+picture_ready_manga_page (GObject *source_object,
+        GAsyncResult *res,
+        gpointer user_data);
  
 static void
 image_page_show (GtkWidget *picture, gpointer user_data) {
     ChapterVisorData *chapter_visor_data = (ChapterVisorData *) user_data;
 
-    chapter_visor_data->zoom = 1;
     set_image_dimensions (picture, chapter_visor_data, 1);
 }
 
@@ -100,6 +103,7 @@ setup_chapter_view (MgMangaChapter *chapter, AdwLeaflet *views_leaflet) {
     chapter_visor_data->current_page = 0;
     chapter_visor_data->pages = pages;
     chapter_visor_data->views_leaflet = views_leaflet;
+    chapter_visor_data->zoom = 1;
     chapter_visor_data->zoomable_picture_container = zoomable_picture_container;
     set_zoomable_picture_container_properties (zoomable_picture_container,
         chapter_visor_data);
@@ -148,12 +152,10 @@ go_prev (GtkButton *prev,
     }
 }
 
-
 static void
 set_image_zoomable_picture_container (ChapterVisorData *chapter_visor_data) {
     GtkScrolledWindow *zoomable_picture_container = chapter_visor_data->zoomable_picture_container;
     MgUtilString *string_util = mg_util_string_new ();
-    GtkPicture *current_picture;
     GListModel *pages = chapter_visor_data->pages;
     guint current_page = chapter_visor_data->current_page;
     const char *url_image_not_owned =
@@ -165,17 +167,28 @@ set_image_zoomable_picture_container (ChapterVisorData *chapter_visor_data) {
             strlen(url_image_not_owned) + 1, 0,
             strlen (url_image_not_owned));
 
-    current_picture = create_picture_from_url
+    create_picture_from_url (url_image, 0, picture_ready_manga_page,
-        (url_image, 0);
+            zoomable_picture_container, chapter_visor_data);
-    chapter_visor_data->current_picture = current_picture;
-    g_signal_connect (G_OBJECT (current_picture), "map",
-            G_CALLBACK (image_page_show), chapter_visor_data);
-    gtk_scrolled_window_set_child (zoomable_picture_container, GTK_WIDGET (current_picture));
-
     g_free (url_image);
     g_clear_object (&string_util);
 }
 
+static void
+picture_ready_manga_page (GObject *source_object,
+        GAsyncResult *res,
+        gpointer user_data) {
+    GTask *task =  G_TASK (res);
+    ChapterVisorData *chapter_visor_data = (ChapterVisorData *) user_data;
+    GtkWidget *picture = g_task_propagate_pointer (task, NULL);
+    GtkScrolledWindow *zoomable_picture_container = GTK_SCROLLED_WINDOW (source_object);
+    if (GTK_IS_WIDGET (picture)) {
+        chapter_visor_data->current_picture = GTK_PICTURE (picture);
+        g_signal_connect (G_OBJECT (picture), "map",
+                G_CALLBACK (image_page_show), chapter_visor_data);
+        gtk_scrolled_window_set_child (zoomable_picture_container, GTK_WIDGET (picture));
+    }
+}
+
 static void
 set_zoomable_picture_container_properties (
         GtkScrolledWindow *zoomable_picture_container,
@@ -219,7 +232,7 @@ zoom_end (GtkGesture *zoom,
         gpointer user_data) {
     ChapterVisorData *chapter_visor_data = (ChapterVisorData *) user_data;
     gdouble scale = gtk_gesture_zoom_get_scale_delta
-            (GTK_GESTURE_ZOOM (zoom));
+        (GTK_GESTURE_ZOOM (zoom));
     gdouble scale_factor = log (scale) / 20 + log (chapter_visor_data->zoom);
     chapter_visor_data->zoom = pow (M_E, scale_factor);
 }

src/view/detail_manga.c

@@ -59,6 +59,18 @@ toggle_folded (GtkButton *toggle_folded_button,
     }
 }
 
+static void
+picture_ready_manga_detail (GObject *source_object,
+        GAsyncResult *res,
+        gpointer user_data) {
+    GTask *task =  G_TASK (res);
+    GtkWidget *picture = g_task_propagate_pointer (task, NULL);
+    GtkBox *box = GTK_BOX (source_object);
+    if (GTK_IS_WIDGET (picture)) {
+        gtk_box_prepend (box, GTK_WIDGET (picture));
+    }
+} 
+
 GtkBox *
 create_detail_view (MgManga *manga, ControlsAdwaita *controls) {
     AdwLeaflet *views_leaflet = controls->views_leaflet;
@@ -77,7 +89,8 @@ create_detail_view (MgManga *manga, ControlsAdwaita *controls) {
             ("network-transmit-receive-symbolic"));
     GtkListView *chapter_list = NULL;
     char *url_image =  mg_manga_get_image_url(manga);
-    GtkPicture *manga_image = create_picture_from_url (url_image, 200);
+    create_picture_from_url (url_image, 200,
+            picture_ready_manga_detail, avatar_title_box, NULL);
     char *manga_title_text = mg_manga_get_title (manga);
     char *title_text = mg_util_xml_get_title_text (
             xml_util, manga_title_text);
@@ -90,7 +103,7 @@ create_detail_view (MgManga *manga, ControlsAdwaita *controls) {
     mg_backend_readmng_retrieve_manga_details (readmng, manga);
     chapter_list = create_list_view_chapters (manga, views_leaflet);
 
-    
+
     g_signal_connect (G_OBJECT (toggle_folded_button), "clicked", G_CALLBACK (toggle_folded), foldable_manga_data);
     g_signal_connect (G_OBJECT (reverse_list_button), "clicked", G_CALLBACK (reverse_list), chapter_list);
 
@@ -103,7 +116,6 @@ create_detail_view (MgManga *manga, ControlsAdwaita *controls) {
     gtk_widget_set_size_request (GTK_WIDGET (manga_description), 200, -1);
 
     gtk_label_set_use_markup (GTK_LABEL (manga_title), 1);
-    gtk_box_append (avatar_title_box, GTK_WIDGET (manga_image));
     gtk_box_append (avatar_title_box, GTK_WIDGET (manga_title));
 
     gtk_box_append (foldable_manga_data, GTK_WIDGET (avatar_title_box));
@@ -125,11 +137,11 @@ create_detail_view (MgManga *manga, ControlsAdwaita *controls) {
     g_object_ref (G_OBJECT (toggle_folded_button));
 
     g_signal_connect (detail_view, "map", G_CALLBACK (show_controls),
-        buttons);
+            buttons);
     g_signal_connect (detail_view, "unmap", G_CALLBACK (hide_controls),
-        buttons);
+            buttons);
 
-       g_clear_object (&readmng);
+    g_clear_object (&readmng);
     g_free (url_image);
     g_free (manga_title_text);
     g_free (title_text);

src/view/list_view_manga.c

@@ -46,6 +46,19 @@ manga_selected (GtkListView *list_view,
     adw_leaflet_navigate (views_leaflet, ADW_NAVIGATION_DIRECTION_FORWARD);
 }
 
+static void
+picture_ready_manga_preview (GObject *source_object,
+        GAsyncResult *res,
+        gpointer user_data) {
+    GTask *task =  G_TASK (res);
+    GtkWidget *picture = g_task_propagate_pointer (task, NULL);
+    GtkBox *box = GTK_BOX (source_object);
+    if (GTK_IS_WIDGET (picture)) {
+        g_object_set_property_int (G_OBJECT (picture), "margin-end", 5);
+        gtk_box_prepend (box, picture);
+    }
+}
+
 static void
 setup_list_view_mangas (GtkSignalListItemFactory *factory,
         GtkListItem *list_item,
@@ -56,13 +69,10 @@ setup_list_view_mangas (GtkSignalListItemFactory *factory,
     char *image_url = mg_manga_get_image_url (manga);
 
     GtkWidget *label = gtk_label_new (manga_title);
-    GtkWidget *picture = GTK_WIDGET (
+    create_picture_from_url (image_url, 100,
-            create_picture_from_url (image_url, 100));
+        picture_ready_manga_preview, box, NULL);
 
-    if (GTK_IS_WIDGET (picture)) {
+    g_object_set_property_int (G_OBJECT(box), "height-request", 100);
-        g_object_set_property_int (G_OBJECT (picture), "margin-end", 5);
-        gtk_box_append (box, picture);
-    }
     gtk_box_append (box, label);
 
     gtk_list_item_set_child (list_item, GTK_WIDGET (box));

src/view/picture.c

@@ -13,24 +13,36 @@
 const char *const IMAGE_CACHE_FORMAT_STRING =
 "%s/.cache/openmg/%s";
 
+typedef struct {
+    char *url;
+    gint picture_size;
+} PictureThreadAttributes;
+
 static char *
 generate_cache_file_name (void);
 GFile *
 get_image_for_url (const char *url);
 
-GtkPicture *
+static void
-create_picture_from_url (const char *const url, gint picture_size) {
+threaded_picture_recover (GTask *task, gpointer source_object,
-    GtkPicture *picture = NULL;
+        gpointer task_data, GCancellable *cancellable) {
+    PictureThreadAttributes *attrs = (PictureThreadAttributes *) task_data; 
+    const char *url = attrs->url;
+    gint picture_size = attrs->picture_size;
     GFileIOStream *iostream = NULL;
     GFile *image = NULL;
     GError *error = NULL;
     GdkTexture *texture = NULL;
+    GtkPicture *picture = NULL;
 
     size_t size_downloaded_image = 0;
     char *downloaded_image = NULL;
 
     MgUtilSoup *util_soup = mg_util_soup_new ();
+    static GMutex mutex;
+    g_mutex_lock (&mutex);
     image = get_image_for_url (url);
+    g_mutex_unlock (&mutex);
     if (!g_file_query_exists (image, NULL)) {
         downloaded_image =
             mg_util_soup_get_request
@@ -57,8 +69,10 @@ create_picture_from_url (const char *const url, gint picture_size) {
         goto cleanup_create_picture_from_url;
     }
     picture = GTK_PICTURE (gtk_picture_new_for_paintable (GDK_PAINTABLE (texture)));
-    g_object_set_property_int (G_OBJECT(picture), "height-request", picture_size);
+    if (GTK_IS_WIDGET (picture)) {
-    g_object_set_property_int (G_OBJECT(picture), "width-request", picture_size);
+        g_object_set_property_int (G_OBJECT(picture), "height-request", picture_size);
+        g_object_set_property_int (G_OBJECT(picture), "width-request", picture_size);
+    }
 
 cleanup_create_picture_from_url:
     if (downloaded_image) {
@@ -69,7 +83,31 @@ cleanup_create_picture_from_url:
         g_clear_object (&iostream);
     }
     g_clear_object (&image);
-    return picture;
+    g_task_return_pointer (task, picture, NULL);
+}
+
+static void
+free_picture_thread_attributes (gpointer user_data) {
+    PictureThreadAttributes *attrs = (PictureThreadAttributes *) user_data;
+    g_free (attrs->url);
+    g_free (attrs);
+}
+
+void
+create_picture_from_url (const char *const url, gint picture_size,
+        GAsyncReadyCallback ready, gpointer source_object,
+        gpointer callback_data) {
+    GTask *task = g_task_new (source_object, NULL, ready, callback_data);
+    size_t url_len = strlen (url) + 1;
+
+    PictureThreadAttributes *attrs = g_malloc (sizeof *attrs);
+
+    attrs->url = g_malloc (url_len * sizeof *url);
+    snprintf (attrs->url, url_len, "%s", url);
+    attrs->picture_size = picture_size;
+    g_task_set_task_data (task, attrs, free_picture_thread_attributes);
+    g_task_run_in_thread (task, threaded_picture_recover);
+
 }
 
 GFile *