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[gtk+/picture: 3/17] API: gdk: Add GdkPixbufPicture

commit c7484fe500f2b0384c59b6bb928d484ab1cc9012
Author: Benjamin Otte <otte redhat com>
Date:   Thu Feb 3 18:24:56 2011 +0100

    API: gdk: Add GdkPixbufPicture
    
    This allows an easy transition from pixbufs to pictures.
    I probably went a bit overboard with the keep-pixbuf and keep-surface
    settings, but oh well...

 gdk/Makefile.am        |    2 +
 gdk/gdk.h              |    1 +
 gdk/gdkpixbufpicture.c |  352 ++++++++++++++++++++++++++++++++++++++++++++++++
 gdk/gdkpixbufpicture.h |   71 ++++++++++
 4 files changed, 426 insertions(+), 0 deletions(-)
---
diff --git a/gdk/Makefile.am b/gdk/Makefile.am
index 96b6b0e..36b56c0 100644
--- a/gdk/Makefile.am
+++ b/gdk/Makefile.am
@@ -81,6 +81,7 @@ gdk_public_h_sources = 				\
 	gdkpango.h				\
 	gdkpicture.h				\
 	gdkpixbuf.h				\
+	gdkpixbufpicture.h			\
 	gdkprivate.h				\
 	gdkproperty.h				\
 	gdkrectangle.h				\
@@ -131,6 +132,7 @@ gdk_c_sources = 				\
 	gdkpango.c				\
 	gdkpicture.c				\
 	gdkpixbuf-drawable.c			\
+	gdkpixbufpicture.c			\
 	gdkrectangle.c				\
 	gdkrgba.c				\
 	gdkscreen.c				\
diff --git a/gdk/gdk.h b/gdk/gdk.h
index 4b57922..f84b963 100644
--- a/gdk/gdk.h
+++ b/gdk/gdk.h
@@ -47,6 +47,7 @@
 #include <gdk/gdkpango.h>
 #include <gdk/gdkpicture.h>
 #include <gdk/gdkpixbuf.h>
+#include <gdk/gdkpixbufpicture.h>
 #include <gdk/gdkproperty.h>
 #include <gdk/gdkrectangle.h>
 #include <gdk/gdkrgba.h>
diff --git a/gdk/gdkpixbufpicture.c b/gdk/gdkpixbufpicture.c
new file mode 100644
index 0000000..1a83ab0
--- /dev/null
+++ b/gdk/gdkpixbufpicture.c
@@ -0,0 +1,352 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2009 Carlos Garnacho <carlosg gnome org>
+ *
+ * This library 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.
+ *
+ * This library 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 this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include "gdkpixbufpicture.h"
+
+#include <cairo-gobject.h>
+
+#include "gdkintl.h"
+#include "gdkinternals.h"
+
+struct _GdkPixbufPicturePrivate {
+  GdkPixbuf *pixbuf;
+  cairo_surface_t *surface;
+  guint keep_pixbuf : 1;
+  guint keep_surface : 1;
+};
+
+G_DEFINE_TYPE (GdkPixbufPicture, gdk_pixbuf_picture, GDK_TYPE_PICTURE)
+
+enum {
+  PROP_0,
+  PROP_PIXBUF,
+  PROP_KEEP_PIXBUF,
+  PROP_KEEP_SURFACE
+};
+
+/**
+ * SECTION:gdkpixbufpicture
+ * @Short_description: Pictures for pixbufs
+ * @Title: GdkPixbufPicture
+ * @See_also: #GdkPicture
+ *
+ * A #GdkPixbufPicture is an implementation of #GdkPicture for a #GdkPixbuf.
+ * It is meant to help in the porting of applications from #GdkPixbuf use
+ * to #GdkPicture use.
+ *
+ * You should try not to use it for newly written code.
+ */
+
+static void
+gdk_pixbuf_picture_get_property (GObject    *object,
+                                 guint       prop_id,
+                                 GValue     *value,
+                                 GParamSpec *pspec)
+{
+  GdkPixbufPicture *picture = GDK_PIXBUF_PICTURE (object);
+  GdkPixbufPicturePrivate *priv = picture->priv;
+
+  switch (prop_id)
+    {
+    case PROP_PIXBUF:
+      g_value_set_object (value, gdk_pixbuf_picture_get_pixbuf (picture));
+      break;
+    case PROP_KEEP_PIXBUF:
+      g_value_set_boolean (value, priv->keep_pixbuf);
+      break;
+    case PROP_KEEP_SURFACE:
+      g_value_set_boolean (value, priv->keep_surface);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gdk_pixbuf_picture_set_property (GObject      *object,
+                                 guint         prop_id,
+                                 const GValue *value,
+                                 GParamSpec   *pspec)
+{
+  GdkPixbufPicture *picture = GDK_PIXBUF_PICTURE (object);
+
+  switch (prop_id)
+    {
+    case PROP_PIXBUF:
+      gdk_pixbuf_picture_set_pixbuf (picture, g_value_get_object (value));
+      break;
+    case PROP_KEEP_PIXBUF:
+      gdk_pixbuf_picture_set_keep_pixbuf (picture, g_value_get_boolean (value));
+      break;
+    case PROP_KEEP_SURFACE:
+      gdk_pixbuf_picture_set_keep_surface (picture, g_value_get_boolean (value));
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static cairo_surface_t *
+gdk_pixbuf_picture_ref_surface (GdkPicture *picture)
+{
+  GdkPixbufPicture *pixbuf_picture = GDK_PIXBUF_PICTURE (picture);
+  GdkPixbufPicturePrivate *priv = pixbuf_picture->priv;
+  cairo_surface_t *surface;
+
+  if (priv->surface)
+    return cairo_surface_reference (priv->surface);
+
+  if (priv->pixbuf)
+    surface = _gdk_cairo_create_surface_for_pixbuf (priv->pixbuf);
+  else
+    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 0, 0);
+
+  if (priv->keep_surface)
+    priv->surface = cairo_surface_reference (surface);
+
+  return surface;
+}
+
+static void
+gdk_pixbuf_picture_class_init (GdkPixbufPictureClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GdkPictureClass *picture_class = GDK_PICTURE_CLASS (klass);
+
+  object_class->get_property = gdk_pixbuf_picture_get_property;
+  object_class->set_property = gdk_pixbuf_picture_set_property;
+
+  picture_class->ref_surface = gdk_pixbuf_picture_ref_surface;
+
+  /**
+   * GdkPixbufPicture:pixbuf:
+   *
+   * The pixbuf to be drawn or %NULL if none was set or GdkPixbufPicture:keep-pixbuf
+   * is %FALSE.
+   *
+   * Since: 3.2
+   */
+  g_object_class_install_property (object_class,
+                                   PROP_PIXBUF,
+                                   g_param_spec_object ("pixbuf",
+                                                        P_("pixbuf"),
+                                                        P_("the pixbuf to display"),
+                                                        GDK_TYPE_PIXBUF,
+                                                        G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  /**
+   * GdkPixbufPicture:keep-pixbuf:
+   *
+   * Whether to cache the pixbuf internally or to convert it into a #cairo_surface_t immediately.
+   *
+   * Since: 3.2
+   */
+  g_object_class_install_property (object_class,
+                                   PROP_KEEP_PIXBUF,
+                                   g_param_spec_boolean ("keep-pixbuf",
+                                                         P_("keep pixbuf"),
+                                                         P_("TRUE to keep the pixbuf around"),
+                                                         TRUE,
+                                                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  /**
+   * GdkPixbufPicture:keep-surface:
+   *
+   * Whether to keep the #cairo_surface_t internally that was created when drawing the picture.
+   *
+   * Since: 3.2
+   */
+  g_object_class_install_property (object_class,
+                                   PROP_KEEP_SURFACE,
+                                   g_param_spec_boolean ("keep-surface",
+                                                         P_("keep surface"),
+                                                         P_("TRUE to keep the surface around"),
+                                                         FALSE,
+                                                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_type_class_add_private (klass, sizeof (GdkPixbufPicturePrivate));
+}
+
+static void
+gdk_pixbuf_picture_init (GdkPixbufPicture *picture)
+{
+  GdkPixbufPicturePrivate *priv;
+
+  picture->priv = G_TYPE_INSTANCE_GET_PRIVATE (picture,
+                                               GDK_TYPE_PIXBUF_PICTURE,
+                                               GdkPixbufPicturePrivate);
+  priv = picture->priv;
+
+  priv->keep_pixbuf = TRUE;
+}
+
+/**
+ * gdk_pixbuf_picture_new:
+ * @pixbuf: the pixbuf to create the picture with or %NULL
+ *
+ * Creates a new #GdkPixbufPicture displaying the given @pixbuf.
+ *
+ * Returns: a new picture
+ **/
+GdkPicture *
+gdk_pixbuf_picture_new (GdkPixbuf *pixbuf)
+{
+  g_return_val_if_fail (pixbuf == NULL || GDK_IS_PIXBUF (pixbuf), NULL);
+
+  return g_object_new (GDK_TYPE_PIXBUF_PICTURE, "pixbuf", pixbuf, NULL);
+}
+
+void
+gdk_pixbuf_picture_set_pixbuf (GdkPixbufPicture *picture,
+                               GdkPixbuf *       pixbuf)
+{
+  GdkPixbufPicturePrivate *priv;
+
+  g_return_if_fail (GDK_IS_PIXBUF_PICTURE (picture));
+  g_return_if_fail (pixbuf == NULL || GDK_IS_PIXBUF (pixbuf));
+
+  priv = picture->priv;
+
+  if (pixbuf)
+    g_object_ref (pixbuf);
+
+  if (priv->surface)
+    {
+      cairo_surface_destroy (priv->surface);
+      priv->surface = NULL;
+    }
+  if (priv->pixbuf)
+    {
+      g_object_unref (priv->pixbuf);
+      priv->pixbuf = NULL;
+    }
+
+  if (priv->keep_pixbuf)
+    {
+      priv->pixbuf = pixbuf;
+    }
+  else
+    {
+      if (pixbuf)
+        priv->surface = _gdk_cairo_create_surface_for_pixbuf (pixbuf);
+    }
+
+  g_object_notify (G_OBJECT (picture), "pixbuf");
+
+  if (pixbuf)
+    {
+      gdk_picture_resized (GDK_PICTURE (picture),
+                           gdk_pixbuf_get_width (pixbuf),
+                           gdk_pixbuf_get_height (pixbuf));
+    }
+  else
+    gdk_picture_resized (GDK_PICTURE (picture), 0, 0);
+}
+
+GdkPixbuf *
+gdk_pixbuf_picture_get_pixbuf (GdkPixbufPicture *picture)
+{
+  g_return_val_if_fail (GDK_IS_PIXBUF_PICTURE (picture), NULL);
+
+  return picture->priv->pixbuf;
+}
+
+void
+gdk_pixbuf_picture_set_keep_pixbuf (GdkPixbufPicture *picture,
+                                    gboolean          keep_pixbuf)
+{
+  GdkPixbufPicturePrivate *priv;
+
+  g_return_if_fail (GDK_IS_PIXBUF_PICTURE (picture));
+
+  priv = picture->priv;
+
+  if (priv->keep_pixbuf == keep_pixbuf)
+    return;
+
+  priv->keep_pixbuf = keep_pixbuf;
+  if (keep_pixbuf)
+    {
+      /* This is equal to setting the pixbuf to NULL because
+       * there's no pixbuf we could keep now. */
+      gdk_pixbuf_picture_set_pixbuf (picture, NULL);
+    }
+  else
+    {
+      gdk_pixbuf_picture_set_keep_surface (picture, TRUE);
+
+      if (priv->pixbuf)
+        {
+          priv->surface = _gdk_cairo_create_surface_for_pixbuf (priv->pixbuf);
+          g_object_unref (priv->pixbuf);
+          priv->pixbuf = NULL;
+        }
+    }
+
+  g_object_notify (G_OBJECT (picture), "keep-pixbuf");
+}
+
+gboolean
+gdk_pixbuf_picture_get_keep_pixbuf (GdkPixbufPicture *picture)
+{
+  g_return_val_if_fail (GDK_IS_PIXBUF_PICTURE (picture), FALSE);
+
+  return picture->priv->keep_pixbuf;
+}
+
+void
+gdk_pixbuf_picture_set_keep_surface (GdkPixbufPicture *picture,
+                                     gboolean          keep_surface)
+{
+  GdkPixbufPicturePrivate *priv;
+
+  g_return_if_fail (GDK_IS_PIXBUF_PICTURE (picture));
+
+  priv = picture->priv;
+
+  if (priv->keep_surface == keep_surface)
+    return;
+
+  priv->keep_surface = keep_surface;
+  if (!keep_surface)
+    {
+      if (priv->surface)
+        {
+          cairo_surface_destroy (priv->surface);
+          priv->surface = NULL;
+        }
+
+      gdk_pixbuf_picture_set_keep_pixbuf (picture, TRUE);
+    }
+
+  g_object_notify (G_OBJECT (picture), "keep-surface");
+}
+
+gboolean
+gdk_pixbuf_picture_get_keep_surface (GdkPixbufPicture *picture)
+{
+  g_return_val_if_fail (GDK_IS_PIXBUF_PICTURE (picture), FALSE);
+
+  return picture->priv->keep_surface;
+}
+
diff --git a/gdk/gdkpixbufpicture.h b/gdk/gdkpixbufpicture.h
new file mode 100644
index 0000000..9c4b7ae
--- /dev/null
+++ b/gdk/gdkpixbufpicture.h
@@ -0,0 +1,71 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2009 Carlos Garnacho <carlosg gnome org>
+ *
+ * This library 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.
+ *
+ * This library 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 this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#if !defined (__GDK_H_INSIDE__) && !defined (GDK_COMPILATION)
+#error "Only <gdk/gdk.h> can be included directly."
+#endif
+
+#ifndef __GDK_PIXBUF_PICTURE_H__
+#define __GDK_PIXBUF_PICTURE_H__
+
+#include <gdk/gdkpicture.h>
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+
+G_BEGIN_DECLS
+
+#define GDK_TYPE_PIXBUF_PICTURE              (gdk_pixbuf_picture_get_type ())
+#define GDK_PIXBUF_PICTURE(o)                (G_TYPE_CHECK_INSTANCE_CAST ((o), GDK_TYPE_PIXBUF_PICTURE, GdkPixbufPicture))
+#define GDK_PIXBUF_PICTURE_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_PIXBUF_PICTURE, GdkPixbufPictureClass))
+#define GDK_IS_PIXBUF_PICTURE(object)        (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_PIXBUF_PICTURE))
+#define GDK_IS_PIXBUF_PICTURE_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_PIXBUF_PICTURE))
+#define GDK_PIXBUF_PICTURE_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_PIXBUF_PICTURE, GdkPixbufPictureClass))
+
+typedef struct _GdkPixbufPicture        GdkPixbufPicture;
+typedef struct _GdkPixbufPicturePrivate GdkPixbufPicturePrivate;
+typedef struct _GdkPixbufPictureClass   GdkPixbufPictureClass;
+
+struct _GdkPixbufPicture {
+  GdkPicture               parent_picture;
+
+  GdkPixbufPicturePrivate *priv;
+};
+
+struct _GdkPixbufPictureClass {
+  GdkPictureClass       parent_class;
+};
+
+GType           gdk_pixbuf_picture_get_type            (void);
+
+GdkPicture *    gdk_pixbuf_picture_new                 (GdkPixbuf        *pixbuf);
+
+void            gdk_pixbuf_picture_set_pixbuf          (GdkPixbufPicture *picture,
+                                                        GdkPixbuf *       pixbuf);
+GdkPixbuf *     gdk_pixbuf_picture_get_pixbuf          (GdkPixbufPicture *picture);
+void            gdk_pixbuf_picture_set_keep_pixbuf     (GdkPixbufPicture *picture,
+                                                        gboolean          keep_pixbuf);
+gboolean        gdk_pixbuf_picture_get_keep_pixbuf     (GdkPixbufPicture *picture);
+void            gdk_pixbuf_picture_set_keep_surface    (GdkPixbufPicture *picture,
+                                                        gboolean          keep_surface);
+gboolean        gdk_pixbuf_picture_get_keep_surface    (GdkPixbufPicture *picture);
+
+G_END_DECLS
+
+#endif /* __GDK_PIXBUF_PICTURE_H__ */
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