gtk-demo: Reanimate floppy buddy

Implement a GdkPaintable wrapper around GdkPixbufAnimation,
so floppy buddy can waive again.

demos/gtk-demo/demo.gresource.xml

@@ -229,6 +229,8 @@
     <file>revealer.ui</file>
   </gresource>
   <gresource prefix="/images">
+    <file>pixbufpaintable.h</file>
+    <file>pixbufpaintable.c</file>
     <file>alphatest.png</file>
     <file>floppybuddy.gif</file>
     <file>gtk-logo.webm</file>

demos/gtk-demo/images.c

@@ -17,6 +17,7 @@
 #include <glib/gstdio.h>
 #include <stdio.h>
 #include <errno.h>
+#include "pixbufpaintable.h"
 
 static GtkWidget *window = NULL;
 static GdkPixbufLoader *pixbuf_loader = NULL;
@@ -372,7 +373,9 @@ do_images (GtkWidget *do_widget)
       gtk_widget_set_valign (frame, GTK_ALIGN_CENTER);
       gtk_box_append (GTK_BOX (vbox), frame);
 
-      picture = gtk_picture_new_for_resource ("/images/floppybuddy.gif");
+      paintable = pixbuf_paintable_new_from_resource ("/images/floppybuddy.gif");
+      picture = gtk_picture_new_for_paintable (paintable);
+      g_object_unref (paintable);
 
       gtk_frame_set_child (GTK_FRAME (frame), picture);
 

demos/gtk-demo/meson.build

@@ -119,7 +119,8 @@ extra_demo_sources = files(['main.c',
                             'singular_value_decomposition.c',
                             'four_point_transform.c',
                             'demo2widget.c',
-                            'demo3widget.c'])
+                            'demo3widget.c',
+                            'pixbufpaintable.c'])
 
 if harfbuzz_dep.found() and pangoft_dep.found()
   demos += files(['font_features.c', 'listview_ucd.c'])

demos/gtk-demo/pixbufpaintable.c

@@ -0,0 +1,187 @@
+#include <gtk/gtk.h>
+#include "pixbufpaintable.h"
+
+struct _PixbufPaintable {
+  GObject parent_instance;
+
+  char *resource_path;
+  GdkPixbufAnimation *anim;
+  GdkPixbufAnimationIter *iter;
+
+  guint timeout;
+};
+
+enum {
+  PROP_RESOURCE_PATH = 1,
+  NUM_PROPERTIES
+};
+
+G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
+static void
+pixbuf_paintable_snapshot (GdkPaintable *paintable,
+                           GdkSnapshot  *snapshot,
+                           double        width,
+                           double        height)
+{
+  PixbufPaintable *self = PIXBUF_PAINTABLE (paintable);
+  GTimeVal val;
+  GdkPixbuf *pixbuf;
+  GdkTexture *texture;
+
+  g_get_current_time (&val);
+  gdk_pixbuf_animation_iter_advance (self->iter, &val);
+  pixbuf = gdk_pixbuf_animation_iter_get_pixbuf (self->iter);
+  texture = gdk_texture_new_for_pixbuf (pixbuf);
+
+  gdk_paintable_snapshot (GDK_PAINTABLE (texture), snapshot, width, height);
+
+  g_object_unref (texture);
+}
+G_GNUC_END_IGNORE_DEPRECATIONS;
+
+static int
+pixbuf_paintable_get_intrinsic_width (GdkPaintable *paintable)
+{
+  PixbufPaintable *self = PIXBUF_PAINTABLE (paintable);
+
+  return gdk_pixbuf_animation_get_width (self->anim);
+}
+
+static int
+pixbuf_paintable_get_intrinsic_height (GdkPaintable *paintable)
+{
+  PixbufPaintable *self = PIXBUF_PAINTABLE (paintable);
+
+  return gdk_pixbuf_animation_get_height (self->anim);
+}
+
+static void
+pixbuf_paintable_init_interface (GdkPaintableInterface *iface)
+{
+  iface->snapshot = pixbuf_paintable_snapshot;
+  iface->get_intrinsic_width = pixbuf_paintable_get_intrinsic_width;
+  iface->get_intrinsic_height = pixbuf_paintable_get_intrinsic_height;
+}
+
+G_DEFINE_TYPE_WITH_CODE(PixbufPaintable, pixbuf_paintable, G_TYPE_OBJECT,
+                        G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
+                                               pixbuf_paintable_init_interface))
+
+static void
+pixbuf_paintable_init (PixbufPaintable *paintable)
+{
+}
+
+static gboolean
+delay_cb (gpointer data)
+{
+  PixbufPaintable *self = data;
+  int delay;
+
+  delay = gdk_pixbuf_animation_iter_get_delay_time (self->iter);
+  self->timeout = g_timeout_add (delay, delay_cb, self);
+
+  gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
+
+  return G_SOURCE_REMOVE;
+}
+
+static void
+pixbuf_paintable_set_resource_path (PixbufPaintable *self,
+                                    const char      *resource_path)
+{
+  int delay;
+
+  g_free (self->resource_path);
+  self->resource_path = g_strdup (resource_path);
+
+  g_clear_object (&self->anim);
+  self->anim = gdk_pixbuf_animation_new_from_resource (resource_path, NULL);
+  g_clear_object (&self->iter);
+  self->iter = gdk_pixbuf_animation_get_iter (self->anim, NULL);
+
+  delay = gdk_pixbuf_animation_iter_get_delay_time (self->iter);
+  self->timeout = g_timeout_add (delay, delay_cb, self);
+
+  gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
+
+  g_object_notify (G_OBJECT (self), "resource-path");
+}
+
+static void
+pixbuf_paintable_set_property (GObject      *object,
+                               guint         prop_id,
+                               const GValue *value,
+                               GParamSpec   *pspec)
+{
+  PixbufPaintable *self = PIXBUF_PAINTABLE (object);
+
+  switch (prop_id)
+    {
+    case PROP_RESOURCE_PATH:
+      pixbuf_paintable_set_resource_path (self, g_value_get_string (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+pixbuf_paintable_get_property (GObject    *object,
+                               guint       prop_id,
+                               GValue     *value,
+                               GParamSpec *pspec)
+{
+  PixbufPaintable *self = PIXBUF_PAINTABLE (object);
+
+  switch (prop_id)
+    {
+    case PROP_RESOURCE_PATH:
+      g_value_set_string (value, self->resource_path);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+pixbuf_paintable_dispose (GObject *object)
+{
+  PixbufPaintable *self = PIXBUF_PAINTABLE (object);
+
+  g_clear_pointer (&self->resource_path, g_free);
+  g_clear_object (&self->anim);
+  g_clear_object (&self->iter);
+  if (self->timeout)
+    {
+      g_source_remove (self->timeout);
+      self->timeout = 0;
+    }
+
+  G_OBJECT_CLASS (pixbuf_paintable_parent_class)->dispose (object);
+}
+
+static void
+pixbuf_paintable_class_init (PixbufPaintableClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->dispose = pixbuf_paintable_dispose;
+  object_class->get_property = pixbuf_paintable_get_property;
+  object_class->set_property = pixbuf_paintable_set_property;
+
+  g_object_class_install_property (object_class, PROP_RESOURCE_PATH,
+      g_param_spec_string ("resource-path", "Resource path", "Resource path",
+                           NULL, G_PARAM_READWRITE));
+
+}
+
+GdkPaintable *
+pixbuf_paintable_new_from_resource (const char *path)
+{
+  return g_object_new (PIXBUF_TYPE_PAINTABLE,
+                       "resource-path", path,
+                       NULL);
+}

demos/gtk-demo/pixbufpaintable.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define PIXBUF_TYPE_PAINTABLE (pixbuf_paintable_get_type ())
+
+G_DECLARE_FINAL_TYPE(PixbufPaintable, pixbuf_paintable, PIXBUF, PAINTABLE, GObject)
+
+GdkPaintable * pixbuf_paintable_new_from_resource (const char *path);
+
+G_END_DECLS