[gtk+] shadow: add _gtk_box_shadow_render()

[Benjamin Otte <otte src gnome org>]

commit 4d986f7fb0ea53bd11f41c389daf9ff8ffdbaa0d
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Wed Jun 1 20:58:53 2011 -0400

    shadow: add _gtk_box_shadow_render()
    
    This supports only inset box-shadow elements for now.

 gtk/gtkshadow.c        |   43 +++++++++++++++++++++++++++++++++++++++++++
 gtk/gtkshadowprivate.h |   12 +++++++++---
 2 files changed, 52 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkshadow.c b/gtk/gtkshadow.c
index 180c968..ebb0df3 100644
--- a/gtk/gtkshadow.c
+++ b/gtk/gtkshadow.c
@@ -23,6 +23,8 @@
 
 #include "gtkshadowprivate.h"
 #include "gtkstylecontext.h"
+#include "gtkthemingengineprivate.h"
+#include "gtkthemingengine.h"
 #include "gtkpango.h"
 #include "gtkthemingengineprivate.h"
 
@@ -323,3 +325,44 @@ _gtk_icon_shadow_paint_spinner (GtkShadow *shadow,
       cairo_restore (cr);
     }
 }
+
+void
+_gtk_box_shadow_render (GtkShadow           *shadow,
+                        cairo_t             *cr,
+                        const GtkRoundedBox *padding_box)
+{
+  GtkShadowElement *element;
+  GtkRoundedBox box;
+  GList *l;
+
+  cairo_save (cr);
+  cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
+
+  _gtk_rounded_box_path (padding_box, cr);
+  cairo_clip (cr);
+
+  /* render shadows starting from the last one,
+   * and the others on top.
+   */
+  for (l = g_list_last (shadow->elements); l != NULL; l = l->prev)
+    {
+      element = l->data;
+
+      if (!element->inset)
+        continue;
+
+      box = *padding_box;
+      _gtk_rounded_box_move (&box, element->hoffset, element->voffset);
+      _gtk_rounded_box_shrink (&box,
+                               element->spread, element->spread,
+                               element->spread, element->spread);
+
+      _gtk_rounded_box_path (&box, cr);
+      _gtk_rounded_box_path (padding_box, cr);
+
+      gdk_cairo_set_source_rgba (cr, &element->color);
+      cairo_fill (cr);
+  }
+
+  cairo_restore (cr);
+}
diff --git a/gtk/gtkshadowprivate.h b/gtk/gtkshadowprivate.h
index 08dd3b6..5b9bad5 100644
--- a/gtk/gtkshadowprivate.h
+++ b/gtk/gtkshadowprivate.h
@@ -23,9 +23,12 @@
 #define __GTK_SHADOW_H__
 
 #include <glib-object.h>
-#include <gtk/gtkstyleproperties.h>
-#include <gtk/gtksymboliccolor.h>
-#include <gtk/gtkicontheme.h>
+
+#include "gtkstyleproperties.h"
+#include "gtksymboliccolor.h"
+#include "gtkicontheme.h"
+#include "gtkcsstypesprivate.h"
+#include "gtkroundedboxprivate.h"
 
 G_BEGIN_DECLS
 
@@ -65,6 +68,9 @@ void       _gtk_icon_shadow_paint_spinner (GtkShadow *shadow,
                                            cairo_t   *cr,
                                            gdouble    radius,
                                            gdouble    progress);
+void       _gtk_box_shadow_render         (GtkShadow           *shadow,
+                                           cairo_t             *cr,
+                                           const GtkRoundedBox *padding_box);
 
 G_END_DECLS