[gtk+/wip/css-icons: 5/6] css: Add -gtk-icon-transform property

[Benjamin Otte <otte src gnome org>]

commit bd52d78e8f4a5f8f927cb7c26931621513329b85
Author: Benjamin Otte <otte redhat com>
Date:   Mon May 5 15:28:18 2014 +0200

    css: Add -gtk-icon-transform property
    
    This property allows transforming icons and is mainly intended to be
    used for spinner animations.

 gtk/gtkcssstylepropertyimpl.c |   20 ++++++++++++++++++--
 gtk/gtkcsstypesprivate.h      |    1 +
 gtk/gtkthemingengine.c        |   10 +++++++++-
 3 files changed, 28 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkcssstylepropertyimpl.c b/gtk/gtkcssstylepropertyimpl.c
index 882f5a6..0195e44 100644
--- a/gtk/gtkcssstylepropertyimpl.c
+++ b/gtk/gtkcssstylepropertyimpl.c
@@ -57,6 +57,7 @@
 #include "gtkcssrgbavalueprivate.h"
 #include "gtkcssshadowsvalueprivate.h"
 #include "gtkcssstringvalueprivate.h"
+#include "gtkcsstransformvalueprivate.h"
 #include "gtkthemingengine.h"
 #include "gtktypebuiltins.h"
 #include "gtkwin32themeprivate.h"
@@ -577,6 +578,13 @@ shadow_value_parse (GtkCssStyleProperty *property,
 }
 
 static GtkCssValue *
+transform_value_parse (GtkCssStyleProperty *property,
+                       GtkCssParser        *parser)
+{
+  return _gtk_css_transform_value_parse (parser);
+}
+
+static GtkCssValue *
 border_corner_radius_value_parse (GtkCssStyleProperty *property,
                                   GtkCssParser        *parser)
 {
@@ -962,8 +970,8 @@ _gtk_css_style_property_init_properties (void)
                                           G_TYPE_NONE,
                                           GTK_STYLE_PROPERTY_ANIMATED | GTK_STYLE_PROPERTY_NO_RESIZE,
                                           css_image_value_parse,
-                                          css_image_value_query,
-                                          css_image_value_assign,
+                                          NULL,
+                                          NULL,
                                           _gtk_css_image_value_new (NULL));
   gtk_css_style_property_register        ("icon-shadow",
                                           GTK_CSS_PROPERTY_ICON_SHADOW,
@@ -973,6 +981,14 @@ _gtk_css_style_property_init_properties (void)
                                           NULL,
                                           NULL,
                                           _gtk_css_shadows_value_new_none ());
+  gtk_css_style_property_register        ("-gtk-icon-transform",
+                                          GTK_CSS_PROPERTY_ICON_TRANSFORM,
+                                          G_TYPE_NONE,
+                                          GTK_STYLE_PROPERTY_ANIMATED | GTK_STYLE_PROPERTY_NO_RESIZE,
+                                          transform_value_parse,
+                                          NULL,
+                                          NULL,
+                                          _gtk_css_transform_value_new_none ());
 
   gtk_css_style_property_register        ("box-shadow",
                                           GTK_CSS_PROPERTY_BOX_SHADOW,
diff --git a/gtk/gtkcsstypesprivate.h b/gtk/gtkcsstypesprivate.h
index 53e24c8..7a4de90 100644
--- a/gtk/gtkcsstypesprivate.h
+++ b/gtk/gtkcsstypesprivate.h
@@ -82,6 +82,7 @@ enum { /*< skip >*/
   GTK_CSS_PROPERTY_TEXT_SHADOW,
   GTK_CSS_PROPERTY_ICON_SOURCE,
   GTK_CSS_PROPERTY_ICON_SHADOW,
+  GTK_CSS_PROPERTY_ICON_TRANSFORM,
   GTK_CSS_PROPERTY_BOX_SHADOW,
   GTK_CSS_PROPERTY_MARGIN_TOP,
   GTK_CSS_PROPERTY_MARGIN_LEFT,
diff --git a/gtk/gtkthemingengine.c b/gtk/gtkthemingengine.c
index b009c75..57b9eb2 100644
--- a/gtk/gtkthemingengine.c
+++ b/gtk/gtkthemingengine.c
@@ -35,6 +35,7 @@
 #include "gtkcssnumbervalueprivate.h"
 #include "gtkcssrgbavalueprivate.h"
 #include "gtkcssshadowsvalueprivate.h"
+#include "gtkcsstransformvalueprivate.h"
 #include "gtkcsstypesprivate.h"
 #include "gtkhslaprivate.h"
 #include "gtkthemingengineprivate.h"
@@ -2158,7 +2159,14 @@ render_icon_image (GtkThemingEngine *engine,
     return FALSE;
 
   cairo_translate (cr, x, y);
-  _gtk_css_image_draw (image, cr, width, height);
+  cairo_translate (cr, width / 2, height / 2);
+  
+  if (_gtk_css_transform_value_apply (_gtk_theming_engine_peek_property (engine, 
GTK_CSS_PROPERTY_ICON_TRANSFORM), cr))
+    {
+      cairo_translate (cr, -width / 2, -height / 2);
+
+      _gtk_css_image_draw (image, cr, width, height);
+    }
 
   return TRUE;
 }