CSS: Add -gtk-scaled(image1,image2,...) support for hidpi assets

1 files changed, 205 insertions, 0 deletions

diff --git a/gtk/gtkcssimagescaled.c b/gtk/gtkcssimagescaled.c
new file mode 100644
index 0000000000..125e53e7df
--- /dev/null
+++ b/gtk/gtkcssimagescaled.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright © 2013 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: Alexander Larsson <alexl@gnome.org>
+ */
+
+#include "config.h"
+
+#include "gtkcssimagescaledprivate.h"
+
+G_DEFINE_TYPE (GtkCssImageScaled, _gtk_css_image_scaled, GTK_TYPE_CSS_IMAGE)
+
+static int
+gtk_css_image_scaled_get_width (GtkCssImage *image)
+{
+  GtkCssImageScaled *scaled = GTK_CSS_IMAGE_SCALED (image);
+
+  return _gtk_css_image_get_width (scaled->images[scaled->scale - 1]) / scaled->scale;
+}
+
+static int
+gtk_css_image_scaled_get_height (GtkCssImage *image)
+{
+  GtkCssImageScaled *scaled = GTK_CSS_IMAGE_SCALED (image);
+
+  return _gtk_css_image_get_height (scaled->images[scaled->scale - 1]) / scaled->scale;
+}
+
+static double
+gtk_css_image_scaled_get_aspect_ratio (GtkCssImage *image)
+{
+  GtkCssImageScaled *scaled = GTK_CSS_IMAGE_SCALED (image);
+
+  return _gtk_css_image_get_aspect_ratio (scaled->images[scaled->scale - 1]);
+}
+
+static void
+gtk_css_image_scaled_draw (GtkCssImage *image,
+			   cairo_t     *cr,
+			   double       width,
+			   double       height)
+{
+  GtkCssImageScaled *scaled = GTK_CSS_IMAGE_SCALED (image);
+
+  _gtk_css_image_draw (scaled->images[scaled->scale - 1], cr, width, height);
+}
+
+static void
+gtk_css_image_scaled_print (GtkCssImage *image,
+                             GString     *string)
+{
+  GtkCssImageScaled *scaled = GTK_CSS_IMAGE_SCALED (image);
+  int i;
+  
+  g_string_append (string, "-gtk-scaled(");
+  for (i = 0; i < scaled->n_images; i++)
+    {
+      _gtk_css_image_print (scaled->images[i], string);
+      if (i != scaled->n_images - 1)
+	g_string_append (string, ",");
+    }
+  g_string_append (string, ")");
+}
+
+static void
+gtk_css_image_scaled_dispose (GObject *object)
+{
+  GtkCssImageScaled *scaled = GTK_CSS_IMAGE_SCALED (object);
+  int i;
+
+  for (i = 0; i < scaled->n_images; i++)
+    g_object_unref (scaled->images[i]);
+  g_free (scaled->images);
+  scaled->images = NULL;
+
+  G_OBJECT_CLASS (_gtk_css_image_scaled_parent_class)->dispose (object);
+}
+
+
+static GtkCssImage *
+gtk_css_image_scaled_compute (GtkCssImage             *image,
+			      guint                    property_id,
+			      GtkStyleProviderPrivate *provider,
+			      int                      scale,
+			      GtkCssComputedValues    *values,
+			      GtkCssComputedValues    *parent_values,
+			      GtkCssDependencies      *dependencies)
+{
+  GtkCssImageScaled *scaled = GTK_CSS_IMAGE_SCALED (image);
+  GtkCssImageScaled *copy;
+  int i;
+
+  scale = MAX(MIN (scale, scaled->n_images), 1);
+
+  if (scaled->scale == scale)
+    return g_object_ref (scaled);
+  else
+    {
+      copy = g_object_new (_gtk_css_image_scaled_get_type (), NULL);
+      copy->scale = scale;
+      copy->n_images = scaled->n_images;
+      copy->images = g_new (GtkCssImage *, scaled->n_images);
+      for (i = 0; i < scaled->n_images; i++)
+        {
+          if (i == scale - 1)
+            copy->images[i] = _gtk_css_image_compute (scaled->images[i],
+                                                      property_id,
+                                                      provider,
+                                                      scale,
+                                                      values,
+                                                      parent_values,
+                                                      dependencies);
+          else
+            copy->images[i] = g_object_ref (scaled->images[i]);
+        }
+
+      return GTK_CSS_IMAGE (copy);
+    }
+}
+
+static gboolean
+gtk_css_image_scaled_parse (GtkCssImage  *image,
+			    GtkCssParser *parser)
+{
+  GtkCssImageScaled *scaled = GTK_CSS_IMAGE_SCALED (image);
+  GPtrArray *images;
+  GtkCssImage *child;
+
+  if (!_gtk_css_parser_try (parser, "-gtk-scaled", TRUE))
+    {
+      _gtk_css_parser_error (parser, "'-gtk-scaled'");
+      return FALSE;
+    }
+
+  if (!_gtk_css_parser_try (parser, "(", TRUE))
+    {
+      _gtk_css_parser_error (parser,
+                             "Expected '(' after '-gtk-scaled'");
+      return FALSE;
+    }
+
+  images = g_ptr_array_new_with_free_func (g_object_unref);
+
+  do
+    {
+      child = _gtk_css_image_new_parse (parser);
+      if (child == NULL)
+	{
+	  g_ptr_array_free (images, TRUE);
+	  return FALSE;
+	}
+      g_ptr_array_add (images, child);
+      
+    }
+  while ( _gtk_css_parser_try (parser, ",", TRUE));
+
+  if (!_gtk_css_parser_try (parser, ")", TRUE))
+    {
+      g_ptr_array_free (images, TRUE);
+      _gtk_css_parser_error (parser,
+                             "Expected ')' at end of '-gtk-scaled'");
+      return FALSE;
+    }
+
+  scaled->n_images = images->len;
+  scaled->images = (GtkCssImage **) g_ptr_array_free (images, FALSE);
+
+  return TRUE;
+}
+
+static void
+_gtk_css_image_scaled_class_init (GtkCssImageScaledClass *klass)
+{
+  GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  image_class->get_width = gtk_css_image_scaled_get_width;
+  image_class->get_height = gtk_css_image_scaled_get_height;
+  image_class->get_aspect_ratio = gtk_css_image_scaled_get_aspect_ratio;
+  image_class->draw = gtk_css_image_scaled_draw;
+  image_class->parse = gtk_css_image_scaled_parse;
+  image_class->compute = gtk_css_image_scaled_compute;
+  image_class->print = gtk_css_image_scaled_print;
+
+  object_class->dispose = gtk_css_image_scaled_dispose;
+}
+
+static void
+_gtk_css_image_scaled_init (GtkCssImageScaled *image_scaled)
+{
+  image_scaled->scale = 1;
+}