From 59d6029f478aa5a12aded8a6ab69ad0d2c547dda Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Florian=20M=C3=BCllner?= <fmuellner@src.gnome.org>
Date: Sun, 10 Jan 2010 02:17:01 +0100
Subject: [PATCH] Implement radial gradients for StWidget

Some theme authors have stated interest in radial gradient backgrounds.
The w3c has some draft:

http://dev.w3.org/csswg/css3-images/#radial-gradients

As this is rather complex, we add only some very basic support, which
extends our syntax for linear gradients:

background-gradient-direction: [vertical|horizontal|radial]

Gradients are centered circles, whose size is determined by the closest
side.

https://bugzilla.gnome.org/show_bug.cgi?id=604945
---
 src/st/st-theme-node.c |  4 ++++
 src/st/st-theme-node.h |  3 ++-
 src/st/st-widget.c     | 10 +++++++++-
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/st/st-theme-node.c b/src/st/st-theme-node.c
index f8998e843..03d1543bf 100644
--- a/src/st/st-theme-node.c
+++ b/src/st/st-theme-node.c
@@ -1356,6 +1356,10 @@ ensure_background (StThemeNode *node)
             {
               node->background_gradient_type = ST_GRADIENT_HORIZONTAL;
             }
+          else if (strcmp (term->content.str->stryng->str, "radial") == 0)
+            {
+              node->background_gradient_type = ST_GRADIENT_RADIAL;
+            }
           else
             {
               g_warning ("Unrecognized background-gradient-direction \"%s\"",
diff --git a/src/st/st-theme-node.h b/src/st/st-theme-node.h
index 31fb08ed5..afb8f0f1d 100644
--- a/src/st/st-theme-node.h
+++ b/src/st/st-theme-node.h
@@ -61,7 +61,8 @@ typedef enum {
 typedef enum {
   ST_GRADIENT_NONE,
   ST_GRADIENT_VERTICAL,
-  ST_GRADIENT_HORIZONTAL
+  ST_GRADIENT_HORIZONTAL,
+  ST_GRADIENT_RADIAL
 } StGradientType;
 
 GType st_theme_node_get_type (void) G_GNUC_CONST;
diff --git a/src/st/st-widget.c b/src/st/st-widget.c
index e97d7cfcb..9759b729c 100644
--- a/src/st/st-widget.c
+++ b/src/st/st-widget.c
@@ -632,8 +632,16 @@ st_widget_redraw_gradient (StWidget  *widget)
 
   if (priv->bg_gradient_type == ST_GRADIENT_VERTICAL)
     pattern = cairo_pattern_create_linear (0, 0, 0, height);
-  else
+  else if (priv->bg_gradient_type == ST_GRADIENT_HORIZONTAL)
     pattern = cairo_pattern_create_linear (0, 0, width, 0);
+  else
+    {
+      gdouble cx, cy;
+
+      cx = width / 2.;
+      cy = height / 2.;
+      pattern = cairo_pattern_create_radial (cx, cy, 0, cx, cy, MIN (cx, cy));
+    }
 
   cairo_pattern_add_color_stop_rgba (pattern, 0,
                                      start->red / 255.,