[totem] grilo: Modify appearance of source icons

[Bastien Nocera <hadess src gnome org>]

commit 542079d35d59b57c4753793fcfb7a04c351a979c
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Jan 20 11:09:59 2015 +0100

    grilo: Modify appearance of source icons
    
    In the channels view, modify the source channels icons to have a
    slightly transparent background, and frame the icon, allowing us to
    avoid having to create grilo specific icons.
    
    See https://bugzilla.gnome.org/show_bug.cgi?id=736548

 src/icon-helpers.c |  144 +++++++++++++++++++++++++++++++++++++--------------
 1 files changed, 104 insertions(+), 40 deletions(-)
---
diff --git a/src/icon-helpers.c b/src/icon-helpers.c
index 08d556a..b26ca53 100644
--- a/src/icon-helpers.c
+++ b/src/icon-helpers.c
@@ -33,6 +33,8 @@
 #define DEFAULT_MAX_THREADS   5
 #define THUMB_SEARCH_SIZE     256
 #define THUMB_SEARCH_HEIGHT   (THUMB_SEARCH_SIZE / 4 * 3)
+#define SOURCES_MAX_HEIGHT    32
+#define VIDEO_ICON_SIZE       16
 
 typedef enum {
        ICON_BOX = 0,
@@ -47,6 +49,12 @@ static GThreadPool *thumbnail_pool;
 static GdkPixbuf *icons[NUM_ICONS];
 static GHashTable *cache_thumbnails; /* key=url, value=GdkPixbuf */
 
+static GdkPixbuf *load_icon (GdkPixbuf *pixbuf, gboolean with_border, gboolean resize);
+static GdkPixbuf *load_named_icon (Totem      *totem,
+                                  const char *name,
+                                  int         size,
+                                  gboolean    with_border);
+
 static gboolean
 media_is_local (GrlMedia *media)
 {
@@ -90,6 +98,16 @@ load_thumbnail_cb (GObject *source_object,
        /* Cache it */
        file = g_task_get_task_data (task);
        if (file) {
+               gboolean is_source;
+
+               is_source = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (task), "is-source"));
+               if (is_source) {
+                       GdkPixbuf *new_pixbuf;
+
+                       new_pixbuf = load_icon (pixbuf, TRUE, TRUE);
+                       g_object_unref (pixbuf);
+                       pixbuf = new_pixbuf;
+               }
                g_hash_table_insert (cache_thumbnails,
                                     g_file_get_uri (G_FILE (file)),
                                     g_object_ref (pixbuf));
@@ -107,6 +125,7 @@ get_stream_thumbnail_cb (GObject *source_object,
        GTask *task = user_data;
        GFileInputStream *stream;
        GError *error = NULL;
+       gboolean is_source;
 
        stream = g_file_read_finish (G_FILE (source_object), res, &error);
        if (!stream) {
@@ -115,9 +134,10 @@ get_stream_thumbnail_cb (GObject *source_object,
                return;
        }
 
+       is_source = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (task), "is-source"));
        gdk_pixbuf_new_from_stream_at_scale_async (G_INPUT_STREAM (stream),
-                                                  THUMB_SEARCH_SIZE,
-                                                  THUMB_SEARCH_HEIGHT,
+                                                  is_source ? -1 : THUMB_SEARCH_SIZE,
+                                                  is_source ? -1 : THUMB_SEARCH_HEIGHT,
                                                   TRUE,
                                                   g_task_get_cancellable (task),
                                                   load_thumbnail_cb,
@@ -276,6 +296,8 @@ totem_grilo_get_thumbnail (GObject             *object,
                        file = g_file_icon_get_file (G_FILE_ICON (icon));
                        url_thumb = g_file_get_uri (file);
                        g_object_unref (file);
+
+                       g_object_set_data (G_OBJECT (task), "is-source", GUINT_TO_POINTER (TRUE));
                }
        }
        if (url_thumb == NULL) {
@@ -310,34 +332,17 @@ put_pixel (guchar *p)
 }
 
 static GdkPixbuf *
-load_icon (Totem      *totem,
-          const char *name,
-          int         size,
-          gboolean    with_border)
+load_icon (GdkPixbuf  *pixbuf,
+          gboolean    with_border,
+          gboolean    resize)
 {
-       GApplication *app;
-       GdkScreen *screen;
-       GIcon *icon;
-       GList *windows;
-       GtkIconInfo *info;
-       GtkIconTheme *theme;
-       GtkStyleContext *context;
-       GdkPixbuf *pixbuf, *ret;
+       GdkPixbuf *ret;
        guchar *pixels;
        int rowstride;
        int x, y;
-
-       app = g_application_get_default ();
-       windows = gtk_application_get_windows (GTK_APPLICATION (app));
-       if (windows == NULL)
-               return NULL;
-
-       icon = g_themed_icon_new (name);
-       screen = gdk_screen_get_default ();
-       theme = gtk_icon_theme_get_for_screen (screen);
-       info = gtk_icon_theme_lookup_by_gicon (theme, icon, size, GTK_ICON_LOOKUP_FORCE_SYMBOLIC);
-       context = gtk_widget_get_style_context (GTK_WIDGET (windows->data));
-       pixbuf = gtk_icon_info_load_symbolic_for_context (info, context, NULL, NULL);
+       int width, height;
+       gdouble offset_x, offset_y, scale;
+       int dest_x, dest_y;
 
        ret = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
                              TRUE,
@@ -345,11 +350,10 @@ load_icon (Totem      *totem,
        pixels = gdk_pixbuf_get_pixels (ret);
        rowstride = gdk_pixbuf_get_rowstride (ret);
 
-       /* Clean up */
-       gdk_pixbuf_fill (ret, 0x00000000);
-
-       /* Draw a border */
+       /* Clean up and draw a border */
        if (with_border) {
+               gdk_pixbuf_fill (ret, 0x00000088);
+
                /* top */
                for (x = 0; x < THUMB_SEARCH_SIZE; x++)
                        put_pixel (pixels + x * 4);
@@ -362,14 +366,74 @@ load_icon (Totem      *totem,
                /* right */
                for (y = 1; y < THUMB_SEARCH_HEIGHT - 1; y++)
                        put_pixel (pixels + y * rowstride + (THUMB_SEARCH_SIZE - 1) * 4);
+       } else {
+               gdk_pixbuf_fill (ret, 0x00000000);
+       }
+
+       width = gdk_pixbuf_get_width (pixbuf);
+       height = gdk_pixbuf_get_height (pixbuf);
+
+       if (resize &&
+           (width > (THUMB_SEARCH_SIZE / 4 * 3) ||
+            height > SOURCES_MAX_HEIGHT)) {
+               gdouble scale_x, scale_y;
+               scale_x = ((gdouble) THUMB_SEARCH_SIZE / 4.0 * 3.0) / (gdouble) width;
+               scale_y = (gdouble) SOURCES_MAX_HEIGHT / (gdouble) height;
+               if (scale_y < 1.0)
+                       scale = scale_y;
+               else
+                       scale = MIN(MIN(scale_x, scale_y), 1.0);
+       } else {
+               scale = 1.0;
        }
 
-       /* Put the icon in the middle */
-       gdk_pixbuf_copy_area (pixbuf, 0, 0,
-                             gdk_pixbuf_get_width (pixbuf), gdk_pixbuf_get_height (pixbuf),
-                             ret,
-                             (THUMB_SEARCH_SIZE - gdk_pixbuf_get_width (pixbuf)) / 2,
-                             (THUMB_SEARCH_HEIGHT - gdk_pixbuf_get_height (pixbuf)) / 2);
+       /* Put the icon in the middle, with help from this post:
+        * http://permalink.gmane.org/gmane.comp.desktop.rox.devel/9065 */
+       offset_x = (THUMB_SEARCH_SIZE - width * scale) / 2;
+       offset_y = (THUMB_SEARCH_HEIGHT - height * scale) / 2;
+       dest_x = MAX(offset_x, 0);
+       dest_y = MAX(offset_y, 0);
+       gdk_pixbuf_composite (pixbuf, ret,
+                             dest_x, dest_y,
+                             MIN(THUMB_SEARCH_SIZE, width * scale),
+                             MIN(THUMB_SEARCH_HEIGHT, height * scale),
+                             offset_x,
+                             offset_y,
+                             scale, scale,
+                             GDK_INTERP_BILINEAR,
+                             255);
+
+       return ret;
+}
+
+static GdkPixbuf *
+load_named_icon (Totem      *totem,
+                const char *name,
+                int         size,
+                gboolean    with_border)
+{
+       GApplication *app;
+       GdkScreen *screen;
+       GIcon *icon;
+       GList *windows;
+       GtkIconInfo *info;
+       GtkIconTheme *theme;
+       GtkStyleContext *context;
+       GdkPixbuf *pixbuf, *ret;
+
+       app = g_application_get_default ();
+       windows = gtk_application_get_windows (GTK_APPLICATION (app));
+       if (windows == NULL)
+               return NULL;
+
+       icon = g_themed_icon_new (name);
+       screen = gdk_screen_get_default ();
+       theme = gtk_icon_theme_get_for_screen (screen);
+       info = gtk_icon_theme_lookup_by_gicon (theme, icon, size, GTK_ICON_LOOKUP_FORCE_SYMBOLIC);
+       context = gtk_widget_get_style_context (GTK_WIDGET (windows->data));
+       pixbuf = gtk_icon_info_load_symbolic_for_context (info, context, NULL, NULL);
+
+       ret = load_icon (pixbuf, with_border, FALSE);
 
        g_object_unref (pixbuf);
        g_object_unref (info);
@@ -435,10 +499,10 @@ totem_grilo_clear_icons (void)
 void
 totem_grilo_setup_icons (Totem *totem)
 {
-       icons[ICON_BOX] = load_icon (totem, "folder-symbolic", THUMB_SEARCH_HEIGHT, FALSE);
-       icons[ICON_VIDEO] = load_icon (totem, "folder-videos-symbolic", 16, TRUE);
-       icons[ICON_VIDEO_THUMBNAILING] = load_icon (totem, "content-loading-symbolic", 16, TRUE);
-       icons[ICON_OPTICAL] = load_icon (totem, "media-optical-dvd-symbolic", THUMB_SEARCH_HEIGHT, FALSE);
+       icons[ICON_BOX] = load_named_icon (totem, "folder-symbolic", THUMB_SEARCH_HEIGHT, FALSE);
+       icons[ICON_VIDEO] = load_named_icon (totem, "folder-videos-symbolic", VIDEO_ICON_SIZE, TRUE);
+       icons[ICON_VIDEO_THUMBNAILING] = load_named_icon (totem, "content-loading-symbolic", VIDEO_ICON_SIZE, 
TRUE);
+       icons[ICON_OPTICAL] = load_named_icon (totem, "media-optical-dvd-symbolic", THUMB_SEARCH_HEIGHT, 
FALSE);
 
        cache_thumbnails = g_hash_table_new_full (g_str_hash,
                                                  g_str_equal,