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[gtk+/wip/baedert/gtkimageview: 99/118] add image abstraction

commit 22b2139b7688c3811615da018c3b3d6bf0863bd5
Author: Timm Bäder <mail baedert org>
Date:   Wed Feb 17 21:36:26 2016 +0100

    add image abstraction

 demos/gtk-demo/image_view.c |   20 +++++---
 gtk/Makefile.am             |    2 +
 gtk/gtk.h                   |    1 +
 gtk/gtkabstractimage.c      |  121 +++++++++++++++++++++++++++++++++++++++++++
 gtk/gtkabstractimage.h      |   94 +++++++++++++++++++++++++++++++++
 gtk/gtkimageview.c          |  104 ++++++++++++++++++++++++-------------
 gtk/gtkimageview.h          |    4 ++
 7 files changed, 302 insertions(+), 44 deletions(-)
---
diff --git a/demos/gtk-demo/image_view.c b/demos/gtk-demo/image_view.c
index 894c985..69173b5 100644
--- a/demos/gtk-demo/image_view.c
+++ b/demos/gtk-demo/image_view.c
@@ -154,16 +154,22 @@ scale_scale_format_value_cb (GtkScale *scale,
 void
 load_pixbuf_button_clicked_cb ()
 {
-  GdkPixbuf *pixbuf;
 
-  /* I really hope you have this. */
-  pixbuf = gdk_pixbuf_new_from_file ("/usr/share/backgrounds/gnome/Fabric.jpg",
-                                     NULL);
 
-  g_assert (pixbuf != NULL);
-  gtk_image_view_set_pixbuf (GTK_IMAGE_VIEW (image_view), pixbuf, 0);
+  GtkPixbufImage *image = gtk_pixbuf_image_new ("/usr/share/backgrounds/gnome/Fabric.jpg", 1);
 
-  g_object_unref (G_OBJECT (pixbuf));
+  gtk_image_view_set_abstract_image (GTK_IMAGE_VIEW (image_view),
+                                     GTK_ABSTRACT_IMAGE (image));
+
+  /*GdkPixbuf *pixbuf;*/
+
+  /*pixbuf = gdk_pixbuf_new_from_file ("/usr/share/backgrounds/gnome/Fabric.jpg",*/
+                                     /*NULL);*/
+
+  /*g_assert (pixbuf != NULL);*/
+  /*gtk_image_view_set_pixbuf (GTK_IMAGE_VIEW (image_view), pixbuf, 0);*/
+
+  /*g_object_unref (G_OBJECT (pixbuf));*/
 }
 
 
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 49dc9ec..77c6948 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -124,6 +124,7 @@ gtk_public_h_sources =              \
        gtkx-autocleanups.h     \
        gtk-a11y.h              \
        gtkaboutdialog.h        \
+       gtkabstractimage.h      \
        gtkaccelgroup.h         \
        gtkaccellabel.h         \
        gtkaccelmap.h           \
@@ -605,6 +606,7 @@ gtk_base_c_sources =                \
        gtksearchenginemodel.c  \
        fnmatch.c               \
        gtkaboutdialog.c        \
+       gtkabstractimage.c      \
        gtkaccelgroup.c         \
        gtkaccellabel.c         \
        gtkaccelmap.c           \
diff --git a/gtk/gtk.h b/gtk/gtk.h
index a853459..8e1994a 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -29,6 +29,7 @@
 
 #include <gdk/gdk.h>
 #include <gtk/gtkaboutdialog.h>
+#include <gtk/gtkabstractimage.h>
 #include <gtk/gtkaccelgroup.h>
 #include <gtk/gtkaccellabel.h>
 #include <gtk/gtkaccelmap.h>
diff --git a/gtk/gtkabstractimage.c b/gtk/gtkabstractimage.c
new file mode 100644
index 0000000..d073c3f
--- /dev/null
+++ b/gtk/gtkabstractimage.c
@@ -0,0 +1,121 @@
+/*  Copyright 2016 Timm Bäder
+ *
+ * GTK+ is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * GLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GTK+; see the file COPYING.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+#include "gtkabstractimage.h"
+
+
+G_DEFINE_ABSTRACT_TYPE (GtkAbstractImage, gtk_abstract_image, G_TYPE_OBJECT)
+
+/* GtkAbstractImage {{{ */
+
+static void
+gtk_abstract_image_init (GtkAbstractImage *image)
+{}
+
+static void
+gtk_abstract_image_class_init (GtkAbstractImageClass *klass)
+{}
+
+int
+gtk_abstract_image_get_width (GtkAbstractImage *image)
+{
+  g_return_val_if_fail (GTK_IS_ABSTRACT_IMAGE (image), 0);
+
+  return GTK_ABSTRACT_IMAGE_GET_CLASS (image)->get_width (image);
+}
+
+int
+gtk_abstract_image_get_height (GtkAbstractImage *image)
+{
+  g_return_val_if_fail (GTK_IS_ABSTRACT_IMAGE (image), 0);
+
+  return GTK_ABSTRACT_IMAGE_GET_CLASS (image)->get_height (image);
+}
+
+void
+gtk_abstract_image_draw (GtkAbstractImage *image, cairo_t *ct)
+{
+  g_return_if_fail (GTK_IS_ABSTRACT_IMAGE (image));
+
+  GTK_ABSTRACT_IMAGE_GET_CLASS (image)->draw (image, ct);
+}
+
+/* }}} */
+
+
+/* GtkPixbufImage {{{ */
+
+G_DEFINE_TYPE (GtkPixbufImage, gtk_pixbuf_image, GTK_TYPE_ABSTRACT_IMAGE)
+
+
+GtkPixbufImage *
+gtk_pixbuf_image_new (const char *path, int scale_factor)
+{
+  GtkPixbufImage *image = g_object_new (GTK_TYPE_PIXBUF_IMAGE, NULL);
+  image->scale_factor = scale_factor;
+  image->pixbuf = gdk_pixbuf_new_from_file (path, NULL);
+
+  return image;
+}
+
+static int
+gtk_pixbuf_image_get_width (GtkAbstractImage *image)
+{
+  return gdk_pixbuf_get_width (GTK_PIXBUF_IMAGE (image)->pixbuf);
+}
+
+static int
+gtk_pixbuf_image_get_height (GtkAbstractImage *image)
+{
+  return gdk_pixbuf_get_height (GTK_PIXBUF_IMAGE (image)->pixbuf);
+}
+
+static int
+gtk_pixbuf_image_get_scale_factor (GtkAbstractImage *image)
+{
+  return GTK_PIXBUF_IMAGE (image)->scale_factor;
+}
+
+static void
+gtk_pixbuf_image_draw (GtkAbstractImage *image, cairo_t *ct)
+{
+  cairo_surface_t *surface = gdk_cairo_surface_create_from_pixbuf (
+      GTK_PIXBUF_IMAGE (image)->pixbuf, 1, NULL);
+
+  cairo_set_source_surface (ct, surface, 0, 0);
+}
+
+
+static void
+gtk_pixbuf_image_init (GtkPixbufImage *image)
+{
+}
+
+static void
+gtk_pixbuf_image_class_init (GtkPixbufImageClass *klass)
+{
+  GtkAbstractImageClass *image_class = GTK_ABSTRACT_IMAGE_CLASS (klass);
+
+  image_class->get_width = gtk_pixbuf_image_get_width;
+  image_class->get_height = gtk_pixbuf_image_get_height;
+  image_class->get_scale_factor = gtk_pixbuf_image_get_scale_factor;
+  image_class->draw = gtk_pixbuf_image_draw;
+}
+
+
+/* }}} */
diff --git a/gtk/gtkabstractimage.h b/gtk/gtkabstractimage.h
new file mode 100644
index 0000000..2eb9083
--- /dev/null
+++ b/gtk/gtkabstractimage.h
@@ -0,0 +1,94 @@
+/*  Copyright 2016 Timm Bäder
+ *
+ * GTK+ is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * GLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GTK+; see the file COPYING.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GTK_ABSTRACT_IMAGE_H__
+#define __GTK_ABSTRACT_IMAGE_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkwidget.h>
+
+G_BEGIN_DECLS
+
+typedef struct _GtkAbstractImage GtkAbstractImage;
+typedef struct _GtkAbstractImageClass GtkAbstractImageClass;
+
+#define GTK_TYPE_ABSTRACT_IMAGE           (gtk_abstract_image_get_type ())
+#define GTK_ABSTRACT_IMAGE(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_ABSTRACT_IMAGE, 
GtkAbstractImage))
+#define GTK_ABSTRACT_IMAGE_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_ABSTRACT_IMAGE, 
GtkAbstractImageClass))
+#define GTK_IS_ABSTRACT_IMAGE(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_ABSTRACT_IMAGE))
+#define GTK_IS_ABSTRACT_IMAGE_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_ABSTRACT_IMAGE))
+#define GTK_ABSTRACT_IMAGE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_ABSTRACT_IMAGE, 
GtkAbstractImageClass))
+
+
+struct _GtkAbstractImage
+{
+  GObject parent;
+};
+
+
+struct _GtkAbstractImageClass
+{
+  GObjectClass parent_class;
+  int    (*get_width) (GtkAbstractImage *image);
+  int    (*get_height) (GtkAbstractImage *image);
+  int    (*get_scale_factor) (GtkAbstractImage *image);
+  void   (*draw) (GtkAbstractImage *image, cairo_t *ct);
+};
+
+GDK_AVAILABLE_IN_3_20
+GType gtk_abstract_image_get_type (void) G_GNUC_CONST;
+
+int gtk_abstract_image_get_width (GtkAbstractImage *image);
+
+int gtk_abstract_image_get_height (GtkAbstractImage *image);
+
+void gtk_abstract_image_draw (GtkAbstractImage *image, cairo_t *ct);
+
+
+typedef struct _GtkPixbufImage GtkPixbufImage;
+typedef struct _GtkPixbufImageClass GtkPixbufImageClass;
+
+#define GTK_TYPE_PIXBUF_IMAGE           (gtk_pixbuf_image_get_type ())
+#define GTK_PIXBUF_IMAGE(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_PIXBUF_IMAGE, 
GtkPixbufImage))
+#define GTK_PIXBUF_IMAGE_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_PIXBUF_IMAGE, 
GtkPixbufImageClass))
+#define GTK_IS_pixbuf_image(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_PIXBUF_IMAGE))
+#define GTK_IS_pixbuf_image_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_PIXBUF_IMAGE))
+#define GTK_PIXBUF_IMAGE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_PIXBUF_IMAGE, 
GtkPixbufImageClass))
+
+struct _GtkPixbufImage
+{
+  GtkAbstractImage parent;
+  GdkPixbuf *pixbuf;
+  int scale_factor;
+};
+
+struct _GtkPixbufImageClass
+{
+  GtkAbstractImageClass parent_class;
+};
+
+GDK_AVAILABLE_IN_3_20
+GtkPixbufImage *gtk_pixbuf_image_new (const char *path, int scale_factor);
+
+
+
+G_END_DECLS
+
+#endif
diff --git a/gtk/gtkimageview.c b/gtk/gtkimageview.c
index 7c32c0d..e79202e 100644
--- a/gtk/gtkimageview.c
+++ b/gtk/gtkimageview.c
@@ -123,9 +123,13 @@ struct _GtkImageViewPrivate
   gboolean                is_animation;
   GdkPixbufAnimation     *source_animation;
   GdkPixbufAnimationIter *source_animation_iter;
-  cairo_surface_t        *image_surface;
+  /*cairo_surface_t        *image_surface;*/
   int                     animation_timeout;
 
+
+  GtkAbstractImage *image;
+
+
   /* Transitions */
   double transition_start_angle;
   gint64 angle_transition_start;
@@ -271,7 +275,8 @@ gtk_image_view_transitions_enabled (GtkImageView *image_view)
                 "gtk-enable-animations", &animations_enabled,
                 NULL);
 
-  return priv->transitions_enabled && animations_enabled && priv->image_surface;
+  /*return priv->transitions_enabled && animations_enabled && priv->image_surface;*/
+  return priv->transitions_enabled && animations_enabled && priv->image;
 }
 
 static gboolean
@@ -577,6 +582,7 @@ gtk_image_view_compute_bounding_box (GtkImageView *image_view,
   double scale;
   double angle;
 
+#if 0
   if (priv->size_valid)
     {
       *width = priv->cached_width;
@@ -586,7 +592,10 @@ gtk_image_view_compute_bounding_box (GtkImageView *image_view,
       return;
     }
 
-  if (!priv->image_surface)
+#endif
+
+  /*if (!priv->image_surface)*/
+  if (!priv->image)
     {
       *width  = 0;
       *height = 0;
@@ -596,8 +605,10 @@ gtk_image_view_compute_bounding_box (GtkImageView *image_view,
   gtk_widget_get_allocation (GTK_WIDGET (image_view), &alloc);
   angle = gtk_image_view_get_real_angle (image_view);
 
-  image_width  = cairo_image_surface_get_width (priv->image_surface)  / priv->scale_factor;
-  image_height = cairo_image_surface_get_height (priv->image_surface) / priv->scale_factor;
+  image_width = gtk_abstract_image_get_width (priv->image) /
+                gtk_abstract_image_get_scale_factor (priv->image);
+  image_height = gtk_abstract_image_get_height (priv->image) /
+                 gtk_abstract_image_get_scale_factor (priv->image);
 
   upper_right_degrees = DEG_TO_RAD (angle) + atan (image_height / image_width);
   upper_left_degrees  = DEG_TO_RAD (angle) + atan (image_height / -image_width);
@@ -669,7 +680,8 @@ gtk_image_view_update_adjustments (GtkImageView *image_view)
   if (!priv->hadjustment && !priv->vadjustment)
     return;
 
-  if (!priv->image_surface)
+  /*if (!priv->image_surface)*/
+  if (!priv->image)
     {
       if (priv->hadjustment)
         gtk_adjustment_configure (priv->hadjustment, 0, 0, 1, 0, 0, 1);
@@ -741,7 +753,8 @@ gesture_zoom_begin_cb (GtkGesture       *gesture,
   GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (user_data);
 
   if (!priv->zoomable ||
-      !priv->image_surface)
+      !priv->image)
+      /*!priv->image_surface)*/
     {
       gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED);
       return;
@@ -834,7 +847,8 @@ gesture_rotate_begin_cb (GtkGesture       *gesture,
   GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (user_data);
 
   if (!priv->rotatable ||
-      !priv->image_surface)
+      /*!priv->image_surface)*/
+      !priv->image)
     {
       gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED);
       return;
@@ -1075,7 +1089,7 @@ gtk_image_view_draw (GtkWidget *widget, cairo_t *ct)
       gtk_render_frame      (sc, ct, 0, 0, widget_width, widget_height);
     }
 
-  if (!priv->image_surface)
+  if (!priv->image)
     return GDK_EVENT_PROPAGATE;
 
   gtk_image_view_compute_bounding_box (image_view,
@@ -1085,8 +1099,10 @@ gtk_image_view_draw (GtkWidget *widget, cairo_t *ct)
   if (draw_width == 0 || draw_height == 0)
     return GDK_EVENT_PROPAGATE;
 
-  image_width  = cairo_image_surface_get_width (priv->image_surface)  * scale / priv->scale_factor;
-  image_height = cairo_image_surface_get_height (priv->image_surface) * scale / priv->scale_factor;
+  image_width = gtk_abstract_image_get_width (priv->image) * scale /
+                gtk_abstract_image_get_scale_factor (priv->image);
+  image_height = gtk_abstract_image_get_height (priv->image) * scale /
+                 gtk_abstract_image_get_scale_factor (priv->image);
 
   if (priv->hadjustment && priv->vadjustment)
     {
@@ -1123,12 +1139,9 @@ gtk_image_view_draw (GtkWidget *widget, cairo_t *ct)
                    - draw_y - (image_height / 2.0));
 
   cairo_scale (ct, scale , scale );
-  cairo_set_source_surface (ct,
-                            priv->image_surface,
-                            draw_x / scale ,
-                            draw_y / scale);
-  cairo_pattern_set_filter (cairo_get_source (ct), CAIRO_FILTER_FAST);
-  cairo_fill (ct);
+  cairo_translate (ct, draw_x / scale, draw_y / scale);
+  gtk_abstract_image_draw (priv->image, ct);
+  cairo_paint (ct);
 
   return GDK_EVENT_PROPAGATE;
 }
@@ -1293,7 +1306,8 @@ gtk_image_view_set_scale (GtkImageView *image_view,
   priv->size_valid = FALSE;
   gtk_image_view_update_adjustments (image_view);
 
-  if (!priv->image_surface)
+  /*if (!priv->image_surface)*/
+  if (!priv->image)
     return;
 
   if (priv->hadjustment != NULL && priv->vadjustment != NULL)
@@ -1378,7 +1392,8 @@ gtk_image_view_set_angle (GtkImageView *image_view,
   g_object_notify_by_pspec (G_OBJECT (image_view),
                             widget_props[PROP_ANGLE]);
 
-  if (!priv->image_surface)
+  /*if (!priv->image_surface)*/
+  if (!priv->image)
     return;
 
   if (priv->hadjustment && priv->vadjustment && !priv->fit_allocation)
@@ -1858,7 +1873,8 @@ gtk_image_view_scroll_event (GtkWidget       *widget,
   double new_scale = priv->scale - (0.1 * event->delta_y);
   State state;
 
-  if (!priv->image_surface ||
+  /*if (!priv->image_surface ||*/
+  if (!priv->image ||
       !priv->zoomable)
     return GDK_EVENT_PROPAGATE;
 
@@ -1997,8 +2013,8 @@ gtk_image_view_finalize (GObject *object)
   g_clear_object (&priv->hadjustment);
   g_clear_object (&priv->vadjustment);
 
-  if (priv->image_surface)
-    cairo_surface_destroy (priv->image_surface);
+  /*if (priv->image_surface)*/
+    /*cairo_surface_destroy (priv->image_surface);*/
 
   G_OBJECT_CLASS (gtk_image_view_parent_class)->finalize (object);
 }
@@ -2165,19 +2181,19 @@ gtk_image_view_replace_surface (GtkImageView    *image_view,
 {
   GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);
 
-  if (priv->image_surface)
-    cairo_surface_destroy (priv->image_surface);
+  /*if (priv->image_surface)*/
+    /*cairo_surface_destroy (priv->image_surface);*/
 
   if (scale_factor == 0)
     priv->scale_factor = gtk_widget_get_scale_factor (GTK_WIDGET (image_view));
   else
     priv->scale_factor = scale_factor;
 
-  priv->image_surface = surface;
+  /*priv->image_surface = surface;*/
   priv->size_valid = FALSE;
 
-  if (surface)
-    cairo_surface_reference (priv->image_surface);
+  /*if (surface)*/
+    /*cairo_surface_reference (priv->image_surface);*/
 }
 
 static void
@@ -2194,14 +2210,14 @@ gtk_image_view_update_surface (GtkImageView    *image_view,
                                                       scale_factor,
                                                       window);
 
-  if (priv->image_surface)
-    {
-      size_changed = (cairo_image_surface_get_width (priv->image_surface) !=
-                      cairo_image_surface_get_width (new_surface)) ||
-                     (cairo_image_surface_get_height (priv->image_surface) !=
-                      cairo_image_surface_get_height (new_surface)) ||
-                     (scale_factor != priv->scale_factor);
-    }
+  /*if (priv->image_surface)*/
+    /*{*/
+      /*size_changed = (cairo_image_surface_get_width (priv->image_surface) !=*/
+                      /*cairo_image_surface_get_width (new_surface)) ||*/
+                     /*(cairo_image_surface_get_height (priv->image_surface) !=*/
+                      /*cairo_image_surface_get_height (new_surface)) ||*/
+                     /*(scale_factor != priv->scale_factor);*/
+    /*}*/
 
   gtk_image_view_replace_surface (image_view,
                                   new_surface,
@@ -2212,7 +2228,7 @@ gtk_image_view_update_surface (GtkImageView    *image_view,
   else
     gtk_widget_queue_resize (GTK_WIDGET (image_view));
 
-  g_assert (priv->image_surface != NULL);
+  /*g_assert (priv->image_surface != NULL);*/
 }
 
 static void
@@ -2224,7 +2240,7 @@ gtk_image_view_replace_animation (GtkImageView       *image_view,
 
   if (priv->source_animation)
     {
-      g_assert (priv->image_surface);
+      /*g_assert (priv->image_surface);*/
       if (priv->is_animation)
         gtk_image_view_stop_animation (image_view);
     }
@@ -2561,3 +2577,17 @@ gtk_image_view_set_animation (GtkImageView       *image_view,
 
   gtk_image_view_replace_animation (image_view, animation, scale_factor);
 }
+
+void
+gtk_image_view_set_abstract_image (GtkImageView     *image_view,
+                                   GtkAbstractImage *abstract_image)
+{
+  GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);
+
+  g_return_if_fail (GTK_IS_IMAGE_VIEW (image_view));
+  g_return_if_fail (GTK_IS_ABSTRACT_IMAGE (abstract_image));
+
+  priv->image = abstract_image;
+
+  gtk_widget_queue_resize (GTK_WIDGET (image_view));
+}
diff --git a/gtk/gtkimageview.h b/gtk/gtkimageview.h
index 12b272c..3bcf63c 100644
--- a/gtk/gtkimageview.h
+++ b/gtk/gtkimageview.h
@@ -23,6 +23,7 @@
 #endif
 
 #include <gtk/gtkwidget.h>
+#include "gtkabstractimage.h"
 
 
 G_BEGIN_DECLS
@@ -149,6 +150,9 @@ void gtk_image_view_set_transitions_enabled (GtkImageView *image_view,
 GDK_AVAILABLE_IN_3_20
 gboolean gtk_image_view_get_transitions_enabled (GtkImageView *image_view);
 
+GDK_AVAILABLE_IN_3_20
+void gtk_image_view_set_abstract_image (GtkImageView *image_view, GtkAbstractImage *abstract_image);
+
 G_END_DECLS
 
 #endif
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