css: Split out GtkCssImageSurface

This is essentially a GtkCssImage for a cairo_surface_t and is a pretty
much straight up copy of GtkCssImageUrl. But we want to implement lazy
loading and animations, so GtkCssImageUrl is going to gain new
features...

https://bugzilla.gnome.org/show_bug.cgi?id=692934

gtk/Makefile.am

@@ -447,6 +447,7 @@ gtk_private_h_sources =		\
 	gtkcssimagegradientprivate.h	\
 	gtkcssimagelinearprivate.h	\
 	gtkcssimageprivate.h	\
+	gtkcssimagesurfaceprivate.h	\
 	gtkcssimageurlprivate.h	\
 	gtkcssimagevalueprivate.h	\
 	gtkcssimagewin32private.h	\
@@ -672,6 +673,7 @@ gtk_base_c_sources = 		\
 	gtkcssimagecrossfade.c	\
 	gtkcssimagegradient.c	\
 	gtkcssimagelinear.c	\
+	gtkcssimagesurface.c	\
 	gtkcssimageurl.c	\
 	gtkcssimagevalue.c	\
 	gtkcssimagewin32.c	\

gtk/gtkcssimagesurface.c

@@ -0,0 +1,163 @@
+/*
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte@gnome.org>
+ */
+
+#include "config.h"
+
+#include "gtkcssimagesurfaceprivate.h"
+
+G_DEFINE_TYPE (GtkCssImageSurface, _gtk_css_image_surface, GTK_TYPE_CSS_IMAGE)
+
+static int
+gtk_css_image_surface_get_width (GtkCssImage *image)
+{
+  GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
+
+  return cairo_image_surface_get_width (surface->surface);
+}
+
+static int
+gtk_css_image_surface_get_height (GtkCssImage *image)
+{
+  GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
+
+  return cairo_image_surface_get_height (surface->surface);
+}
+
+static void
+gtk_css_image_surface_draw (GtkCssImage *image,
+                            cairo_t     *cr,
+                            double       width,
+                            double       height)
+{
+  GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
+
+  cairo_rectangle (cr, 0, 0, width, height);
+  cairo_scale (cr,
+               width / cairo_image_surface_get_width (surface->surface),
+               height / cairo_image_surface_get_height (surface->surface));
+  cairo_set_source_surface (cr, surface->surface, 0, 0);
+  cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
+  cairo_fill (cr);
+}
+
+static cairo_status_t
+surface_write (void                *closure,
+               const unsigned char *data,
+               unsigned int         length)
+{
+  g_byte_array_append (closure, data, length);
+
+  return CAIRO_STATUS_SUCCESS;
+}
+
+static void
+gtk_css_image_surface_print (GtkCssImage *image,
+                             GString     *string)
+{
+#if CAIRO_HAS_PNG_FUNCTIONS
+  GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
+  GByteArray *array;
+  char *base64;
+  
+  array = g_byte_array_new ();
+  cairo_surface_write_to_png_stream (surface->surface, surface_write, array);
+  base64 = g_base64_encode (array->data, array->len);
+  g_byte_array_free (array, TRUE);
+
+  g_string_append (string, "surface(\"data:image/png;base64,");
+  g_string_append (string, base64);
+  g_string_append (string, "\")");
+
+  g_free (base64);
+#else
+  g_string_append (string, "none /* you need cairo png functions enabled to make this work */");
+#endif
+}
+
+static void
+gtk_css_image_surface_dispose (GObject *object)
+{
+  GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (object);
+
+  if (surface->surface)
+    {
+      cairo_surface_destroy (surface->surface);
+      surface->surface = NULL;
+    }
+
+  G_OBJECT_CLASS (_gtk_css_image_surface_parent_class)->dispose (object);
+}
+
+static void
+_gtk_css_image_surface_class_init (GtkCssImageSurfaceClass *klass)
+{
+  GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  image_class->get_width = gtk_css_image_surface_get_width;
+  image_class->get_height = gtk_css_image_surface_get_height;
+  image_class->draw = gtk_css_image_surface_draw;
+  image_class->print = gtk_css_image_surface_print;
+
+  object_class->dispose = gtk_css_image_surface_dispose;
+}
+
+static void
+_gtk_css_image_surface_init (GtkCssImageSurface *image_surface)
+{
+}
+
+GtkCssImage *
+_gtk_css_image_surface_new (cairo_surface_t *surface)
+{
+  GtkCssImage *image;
+
+  g_return_val_if_fail (surface != NULL, NULL);
+
+  image = g_object_new (GTK_TYPE_CSS_IMAGE_SURFACE, NULL);
+  
+  GTK_CSS_IMAGE_SURFACE (image)->surface = cairo_surface_reference (surface);
+
+  return image;
+}
+
+GtkCssImage *
+_gtk_css_image_surface_new_for_pixbuf (GdkPixbuf *pixbuf)
+{
+  GtkCssImage *image;
+  cairo_surface_t *surface;
+  cairo_t *cr;
+
+  g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
+
+  surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+                                        gdk_pixbuf_get_width (pixbuf),
+                                        gdk_pixbuf_get_height (pixbuf));
+  cr = cairo_create (surface);
+  gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
+  cairo_paint (cr);
+  cairo_destroy (cr);
+
+  image = _gtk_css_image_surface_new (surface);
+
+  cairo_surface_destroy (surface);
+
+  return image;
+}
+

gtk/gtkcssimagesurfaceprivate.h

@@ -0,0 +1,56 @@
+/*
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte@gnome.org>
+ */
+
+#ifndef __GTK_CSS_IMAGE_SURFACE_PRIVATE_H__
+#define __GTK_CSS_IMAGE_SURFACE_PRIVATE_H__
+
+#include "gtk/gtkcssimageprivate.h"
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_CSS_IMAGE_SURFACE           (_gtk_css_image_surface_get_type ())
+#define GTK_CSS_IMAGE_SURFACE(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_CSS_IMAGE_SURFACE, GtkCssImageSurface))
+#define GTK_CSS_IMAGE_SURFACE_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_CSS_IMAGE_SURFACE, GtkCssImageSurfaceClass))
+#define GTK_IS_CSS_IMAGE_SURFACE(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_CSS_IMAGE_SURFACE))
+#define GTK_IS_CSS_IMAGE_SURFACE_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_CSS_IMAGE_SURFACE))
+#define GTK_CSS_IMAGE_SURFACE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_CSS_IMAGE_SURFACE, GtkCssImageSurfaceClass))
+
+typedef struct _GtkCssImageSurface           GtkCssImageSurface;
+typedef struct _GtkCssImageSurfaceClass      GtkCssImageSurfaceClass;
+
+struct _GtkCssImageSurface
+{
+  GtkCssImage parent;
+
+  cairo_surface_t *surface;             /* the surface we render - guaranteed to be an image surface */
+};
+
+struct _GtkCssImageSurfaceClass
+{
+  GtkCssImageClass parent_class;
+};
+
+GType          _gtk_css_image_surface_get_type             (void) G_GNUC_CONST;
+
+GtkCssImage *  _gtk_css_image_surface_new                  (cairo_surface_t *surface);
+GtkCssImage *  _gtk_css_image_surface_new_for_pixbuf       (GdkPixbuf       *pixbuf);
+
+G_END_DECLS
+
+#endif /* __GTK_CSS_IMAGE_SURFACE_PRIVATE_H__ */

gtk/gtkcssimageurl.c

@@ -22,8 +22,7 @@
 #include <string.h>
 
 #include "gtkcssimageurlprivate.h"
-
-#include "gtkcssprovider.h"
+#include "gtkcssimagesurfaceprivate.h"
 
 G_DEFINE_TYPE (GtkCssImageUrl, _gtk_css_image_url, GTK_TYPE_CSS_IMAGE)
 
@@ -32,7 +31,7 @@ gtk_css_image_url_get_width (GtkCssImage *image)
 {
   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 
-  return cairo_image_surface_get_width (url->surface);
+  return _gtk_css_image_get_width (url->loaded_image);
 }
 
 static int
@@ -40,7 +39,15 @@ gtk_css_image_url_get_height (GtkCssImage *image)
 {
   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 
-  return cairo_image_surface_get_height (url->surface);
+  return _gtk_css_image_get_height (url->loaded_image);
+}
+
+static double
+gtk_css_image_url_get_aspect_ratio (GtkCssImage *image)
+{
+  GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
+
+  return _gtk_css_image_get_aspect_ratio (url->loaded_image);
 }
 
 static void
@@ -51,13 +58,7 @@ gtk_css_image_url_draw (GtkCssImage        *image,
 {
   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
 
-  cairo_rectangle (cr, 0, 0, width, height);
-  cairo_scale (cr,
-               width / cairo_image_surface_get_width (url->surface),
-               height / cairo_image_surface_get_height (url->surface));
-  cairo_set_source_surface (cr, url->surface, 0, 0);
-  cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
-  cairo_fill (cr);
+  _gtk_css_image_draw (url->loaded_image, cr, width, height);
 }
 
 static gboolean
@@ -66,7 +67,6 @@ gtk_css_image_url_parse (GtkCssImage  *image,
 {
   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
   GdkPixbuf *pixbuf;
-  cairo_t *cr;
   GError *error = NULL;
   GFileInputStream *input;
 
@@ -105,50 +105,19 @@ gtk_css_image_url_parse (GtkCssImage  *image,
       return FALSE;
     }
 
-  url->surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
-                                             gdk_pixbuf_get_width (pixbuf),
-                                             gdk_pixbuf_get_height (pixbuf));
-  cr = cairo_create (url->surface);
-  gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
-  cairo_paint (cr);
-  cairo_destroy (cr);
+  url->loaded_image = _gtk_css_image_surface_new_for_pixbuf (pixbuf);
   g_object_unref (pixbuf);
 
   return TRUE;
 }
 
-static cairo_status_t
-surface_write (void                *closure,
-               const unsigned char *data,
-               unsigned int         length)
-{
-  g_byte_array_append (closure, data, length);
-
-  return CAIRO_STATUS_SUCCESS;
-}
-
 static void
 gtk_css_image_url_print (GtkCssImage *image,
                          GString     *string)
 {
-#if CAIRO_HAS_PNG_FUNCTIONS
   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (image);
-  GByteArray *array;
-  char *base64;
-  
-  array = g_byte_array_new ();
-  cairo_surface_write_to_png_stream (url->surface, surface_write, array);
-  base64 = g_base64_encode (array->data, array->len);
-  g_byte_array_free (array, TRUE);
 
-  g_string_append (string, "url(\"data:image/png;base64,");
-  g_string_append (string, base64);
-  g_string_append (string, "\")");
-
-  g_free (base64);
-#else
-  g_string_append (string, "none /* you need cairo png functions enabled to make this work */");
-#endif
+  _gtk_css_image_print (url->loaded_image, string);
 }
 
 static void
@@ -157,12 +126,7 @@ gtk_css_image_url_dispose (GObject *object)
   GtkCssImageUrl *url = GTK_CSS_IMAGE_URL (object);
 
   g_clear_object (&url->file);
-
-  if (url->surface)
-    {
-      cairo_surface_destroy (url->surface);
-      url->surface = NULL;
-    }
+  g_clear_object (&url->loaded_image);
 
   G_OBJECT_CLASS (_gtk_css_image_url_parent_class)->dispose (object);
 }
@@ -175,6 +139,7 @@ _gtk_css_image_url_class_init (GtkCssImageUrlClass *klass)
 
   image_class->get_width = gtk_css_image_url_get_width;
   image_class->get_height = gtk_css_image_url_get_height;
+  image_class->get_aspect_ratio = gtk_css_image_url_get_aspect_ratio;
   image_class->draw = gtk_css_image_url_draw;
   image_class->parse = gtk_css_image_url_parse;
   image_class->print = gtk_css_image_url_print;

gtk/gtkcssimageurlprivate.h

@@ -39,7 +39,7 @@ struct _GtkCssImageUrl
   GtkCssImage parent;
 
   GFile           *file;                /* the file we're loading from */
-  cairo_surface_t *surface;             /* the surface we render - guaranteed to be an image surface */
+  GtkCssImage     *loaded_image;        /* the actual image we render */
 };
 
 struct _GtkCssImageUrlClass