[gtk+/wip/css: 103/167] css: Add GtkCssImage class

[Benjamin Otte <otte src gnome org>]

commit 4fb7555cfd5710899db81e6392a4d8cf9ebbbe19
Author: Benjamin Otte <otte redhat com>
Date:   Mon Dec 19 22:11:20 2011 +0100

    css: Add GtkCssImage class
    
    Doesn't do anything yet, just exists.

 gtk/Makefile.am          |    2 +
 gtk/gtkcssimage.c        |  179 ++++++++++++++++++++++++++++++++++++++++++++++
 gtk/gtkcssimageprivate.h |   98 +++++++++++++++++++++++++
 3 files changed, 279 insertions(+), 0 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index b995501..1717480 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -410,6 +410,7 @@ gtk_private_h_sources =		\
 	gtkcellareaboxcontextprivate.h	\
 	gtkcontainerprivate.h   \
 	gtkcsscustompropertyprivate.h \
+	gtkcssimageprivate.h	\
 	gtkcsslookupprivate.h	\
 	gtkcssparserprivate.h	\
 	gtkcssproviderprivate.h	\
@@ -585,6 +586,7 @@ gtk_base_c_sources = 		\
 	gtkcomboboxtext.c	\
 	gtkcontainer.c		\
 	gtkcsscustomproperty.c	\
+	gtkcssimage.c		\
 	gtkcsslookup.c		\
 	gtkcssparser.c		\
 	gtkcssprovider.c	\
diff --git a/gtk/gtkcssimage.c b/gtk/gtkcssimage.c
new file mode 100644
index 0000000..2aec9bb
--- /dev/null
+++ b/gtk/gtkcssimage.c
@@ -0,0 +1,179 @@
+/*
+ * Copyright  2011 Red Hat Inc.
+ *
+ * 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 2.1 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+#include "config.h"
+
+#include "gtkcssimageprivate.h"
+
+G_DEFINE_ABSTRACT_TYPE (GtkCssImage, _gtk_css_image, G_TYPE_OBJECT)
+
+static int
+gtk_css_image_real_get_width (GtkCssImage *image)
+{
+  return 0;
+}
+
+static int
+gtk_css_image_real_get_height (GtkCssImage *image)
+{
+  return 0;
+}
+
+static double
+gtk_css_image_real_get_aspect_ratio (GtkCssImage *image)
+{
+  int width, height;
+
+  width = _gtk_css_image_get_width (image);
+  height = _gtk_css_image_get_height (image);
+
+  if (width && height)
+    return (double) width / height;
+  else
+    return 0;
+}
+
+static GtkCssImage *
+gtk_css_image_real_compute (GtkCssImage     *image,
+                            GtkStyleContext *context)
+{
+  return g_object_ref (image);
+}
+
+static void
+_gtk_css_image_class_init (GtkCssImageClass *klass)
+{
+  klass->get_width = gtk_css_image_real_get_width;
+  klass->get_height = gtk_css_image_real_get_height;
+  klass->get_aspect_ratio = gtk_css_image_real_get_aspect_ratio;
+  klass->compute = gtk_css_image_real_compute;
+}
+
+static void
+_gtk_css_image_init (GtkCssImage *image)
+{
+}
+
+int
+_gtk_css_image_get_width (GtkCssImage *image)
+{
+  GtkCssImageClass *klass;
+
+  g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), 0);
+
+  klass = GTK_CSS_IMAGE_GET_CLASS (image);
+
+  return klass->get_width (image);
+}
+
+int
+_gtk_css_image_get_height (GtkCssImage *image)
+{
+  GtkCssImageClass *klass;
+
+  g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), 0);
+
+  klass = GTK_CSS_IMAGE_GET_CLASS (image);
+
+  return klass->get_height (image);
+}
+
+double
+_gtk_css_image_get_aspect_ratio (GtkCssImage *image)
+{
+  GtkCssImageClass *klass;
+
+  g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), 0);
+
+  klass = GTK_CSS_IMAGE_GET_CLASS (image);
+
+  return klass->get_aspect_ratio (image);
+}
+
+GtkCssImage *
+_gtk_css_image_compute (GtkCssImage     *image,
+                        GtkStyleContext *context)
+{
+  GtkCssImageClass *klass;
+
+  g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), NULL);
+  g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
+
+  klass = GTK_CSS_IMAGE_GET_CLASS (image);
+
+  return klass->compute (image, context);
+}
+
+void
+_gtk_css_image_draw (GtkCssImage        *image,
+                     cairo_t            *cr,
+                     double              width,
+                     double              height)
+{
+  GtkCssImageClass *klass;
+
+  g_return_if_fail (GTK_IS_CSS_IMAGE (image));
+  g_return_if_fail (cr != NULL);
+
+  cairo_save (cr);
+
+  klass = GTK_CSS_IMAGE_GET_CLASS (image);
+
+  klass->draw (image, cr, width, height);
+
+  cairo_restore (cr);
+}
+
+void
+_gtk_css_image_print (GtkCssImage *image,
+                      GString     *string)
+{
+  GtkCssImageClass *klass;
+
+  g_return_if_fail (GTK_IS_CSS_IMAGE (image));
+  g_return_if_fail (string != NULL);
+
+  klass = GTK_CSS_IMAGE_GET_CLASS (image);
+
+  klass->print (image, string);
+}
+
+GtkCssImage *
+_gtk_css_image_new_parse (GtkCssParser *parser,
+                          GFile        *base)
+{
+  GtkCssImage *image;
+  GtkCssImageClass *klass;
+
+  g_return_val_if_fail (parser != NULL, NULL);
+  g_return_val_if_fail (G_IS_FILE (base), NULL);
+
+  image = g_object_new (GTK_TYPE_CSS_IMAGE, NULL);
+
+  klass = GTK_CSS_IMAGE_GET_CLASS (image);
+  if (!klass->parse (image, parser, base))
+    {
+      g_object_unref (image);
+      return NULL;
+    }
+
+  return image;
+}
+
diff --git a/gtk/gtkcssimageprivate.h b/gtk/gtkcssimageprivate.h
new file mode 100644
index 0000000..20a09a4
--- /dev/null
+++ b/gtk/gtkcssimageprivate.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright  2011 Red Hat Inc.
+ *
+ * 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 2.1 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+#ifndef __GTK_CSS_IMAGE_PRIVATE_H__
+#define __GTK_CSS_IMAGE_PRIVATE_H__
+
+#include <cairo.h>
+#include <glib-object.h>
+
+#include "gtk/gtkstylecontext.h"
+#include "gtk/gtkcssparserprivate.h"
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_CSS_IMAGE           (_gtk_css_image_get_type ())
+#define GTK_CSS_IMAGE(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_CSS_IMAGE, GtkCssImage))
+#define GTK_CSS_IMAGE_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_CSS_IMAGE, GtkCssImageClass))
+#define GTK_IS_CSS_IMAGE(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_CSS_IMAGE))
+#define GTK_IS_CSS_IMAGE_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_CSS_IMAGE))
+#define GTK_CSS_IMAGE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_CSS_IMAGE, GtkCssImageClass))
+
+typedef struct _GtkCssImage           GtkCssImage;
+typedef struct _GtkCssImageClass      GtkCssImageClass;
+
+struct _GtkCssImage
+{
+  GObject parent;
+};
+
+struct _GtkCssImageClass
+{
+  GObjectClass parent_class;
+
+  /* width of image or 0 if it has no width (optional) */
+  int          (* get_width)                       (GtkCssImage        *image);
+  /* height of image or 0 if it has no height (optional) */
+  int          (* get_height)                      (GtkCssImage        *image);
+  /* aspect ratio (width / height) of image or 0 if it has no aspect ratio (optional) */
+  double       (* get_aspect_ratio)                (GtkCssImage        *image);
+
+  /* create "computed value" in CSS terms, returns a new reference */
+  GtkCssImage *(* compute)                         (GtkCssImage        *image,
+                                                    GtkStyleContext    *context);
+
+  /* draw to 0,0 with the given width and height */
+  void         (* draw)                            (GtkCssImage        *image,
+                                                    cairo_t            *cr,
+                                                    double              width,
+                                                    double              height);
+  /* parse CSS, return TRUE on success */
+  gboolean     (* parse)                           (GtkCssImage        *image,
+                                                    GtkCssParser       *parser,
+                                                    GFile              *base);
+  /* print to CSS */
+  void         (* print)                           (GtkCssImage        *image,
+                                                    GString            *string);
+};
+
+GType          _gtk_css_image_get_type             (void) G_GNUC_CONST;
+
+GtkCssImage *  _gtk_css_image_new_parse            (GtkCssParser       *parser,
+                                                    GFile              *base);
+
+int            _gtk_css_image_get_width            (GtkCssImage        *image);
+int            _gtk_css_image_get_height           (GtkCssImage        *image);
+double         _gtk_css_image_get_aspect_ratio     (GtkCssImage        *image);
+
+GtkCssImage *  _gtk_css_image_compute              (GtkCssImage        *image,
+                                                    GtkStyleContext    *context);
+
+void           _gtk_css_image_draw                 (GtkCssImage        *image,
+                                                    cairo_t            *cr,
+                                                    double              width,
+                                                    double              height);
+void           _gtk_css_image_print                (GtkCssImage        *image,
+                                                    GString            *string);
+
+
+G_END_DECLS
+
+#endif /* __GTK_CSS_IMAGE_PRIVATE_H__ */