cds: enable outset shadows

Adds conditional code paths to GdkCssShadowValue for painting outset
shadows, and allows shadows to be applied in two passes (first outset
then inset). This can be used to draw csd shadows in outer window
borders.

https://bugzilla.gnome.org/show_bug.cgi?id=695998
Signed-off-by: Rob Bradford <rob@linux.intel.com>

1 files changed, 19 insertions, 4 deletions

diff --git a/gtk/gtkcssshadowvalue.c b/gtk/gtkcssshadowvalue.c
index 618288807a..6e61cab426 100644
--- a/gtk/gtkcssshadowvalue.c
+++ b/gtk/gtkcssshadowvalue.c
@@ -445,6 +445,14 @@ _gtk_css_shadow_value_paint_spinner (const GtkCssValue *shadow,
   cairo_restore (cr);
 }
 
+gboolean
+_gtk_css_shadow_value_get_inset (const GtkCssValue *shadow)
+{
+  g_return_val_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW, FALSE);
+
+  return shadow->inset;
+}
+
 void
 _gtk_css_shadow_value_paint_box (const GtkCssValue   *shadow,
                                  cairo_t             *cr,
@@ -457,15 +465,21 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue   *shadow,
 
   cairo_save (cr);
 
-  _gtk_rounded_box_path (padding_box, cr);
-  cairo_clip (cr);
+  if (shadow->inset)
+    {
+      _gtk_rounded_box_path (padding_box, cr);
+      cairo_clip (cr);
+    }
 
   box = *padding_box;
   _gtk_rounded_box_move (&box,
                          _gtk_css_number_value_get (shadow->hoffset, 0),
                          _gtk_css_number_value_get (shadow->voffset, 0));
   spread = _gtk_css_number_value_get (shadow->spread, 0);
-  _gtk_rounded_box_shrink (&box, spread, spread, spread, spread);
+  if (shadow->inset)
+    _gtk_rounded_box_shrink (&box, spread, spread, spread, spread);
+  else /* Outset */
+    _gtk_rounded_box_grow (&box, spread, spread, spread, spread);
 
   clip_box = *padding_box;
   radius = _gtk_css_number_value_get (shadow->radius, 0);
@@ -475,7 +489,8 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue   *shadow,
 
   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
   _gtk_rounded_box_path (&box, cr);
-  _gtk_rounded_box_clip_path (&clip_box, cr);
+  if (shadow->inset)
+    _gtk_rounded_box_clip_path (&clip_box, cr);
 
   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
   cairo_fill (cr);