[gtk+] css: Implement repeating linear gradients

[Benjamin Otte <otte src gnome org>]

commit 811e848832c140b21fe711a0f377248aef040550
Author: Benjamin Otte <otte redhat com>
Date:   Tue Jan 17 11:44:07 2012 +0100

    css: Implement repeating linear gradients

 gtk/gtkcssimage.c              |    3 ++-
 gtk/gtkcssimagelinear.c        |   18 +++++++++++++++---
 gtk/gtkcssimagelinearprivate.h |    1 +
 3 files changed, 18 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkcssimage.c b/gtk/gtkcssimage.c
index 11f3a80..b8eda5f 100644
--- a/gtk/gtkcssimage.c
+++ b/gtk/gtkcssimage.c
@@ -324,7 +324,8 @@ gtk_css_image_get_parser_type (GtkCssParser *parser)
     { "url", _gtk_css_image_url_get_type },
     { "-gtk-gradient", _gtk_css_image_gradient_get_type },
     { "-gtk-win32-theme-part", _gtk_css_image_win32_get_type },
-    { "linear-gradient", _gtk_css_image_linear_get_type }
+    { "linear-gradient", _gtk_css_image_linear_get_type },
+    { "repeating-linear-gradient", _gtk_css_image_linear_get_type }
   };
   guint i;
 
diff --git a/gtk/gtkcssimagelinear.c b/gtk/gtkcssimagelinear.c
index 890465c..130f9d9 100644
--- a/gtk/gtkcssimagelinear.c
+++ b/gtk/gtkcssimagelinear.c
@@ -168,7 +168,10 @@ gtk_css_image_linear_draw (GtkCssImage        *image,
   gtk_css_image_linear_get_start_end (linear, length, &start, &end);
   pattern = cairo_pattern_create_linear (x * (start - 0.5), y * (start - 0.5),
                                          x * (end - 0.5),   y * (end - 0.5));
-  cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
+  if (linear->repeating)
+    cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
+  else
+    cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
 
   offset = start;
   last = -1;
@@ -230,7 +233,11 @@ gtk_css_image_linear_parse (GtkCssImage  *image,
   GtkCssImageLinear *linear = GTK_CSS_IMAGE_LINEAR (image);
   guint i;
 
-  if (!_gtk_css_parser_try (parser, "linear-gradient(", TRUE))
+  if (_gtk_css_parser_try (parser, "repeating-linear-gradient(", TRUE))
+    linear->repeating = TRUE;
+  else if (_gtk_css_parser_try (parser, "linear-gradient(", TRUE))
+    linear->repeating = FALSE;
+  else
     {
       _gtk_css_parser_error (parser, "Not a linear gradient");
       return FALSE;
@@ -356,7 +363,11 @@ gtk_css_image_linear_print (GtkCssImage *image,
   /* XXX: Do these need to be prinatable? */
   g_return_if_fail (!linear->is_computed);
 
-  g_string_append (string, "linear-gradient(");
+  if (linear->repeating)
+    g_string_append (string, "repeating-linear-gradient(");
+  else
+    g_string_append (string, "linear-gradient(");
+
   if (linear->angle.unit == GTK_CSS_NUMBER)
     {
       guint side = linear->angle.value;
@@ -421,6 +432,7 @@ gtk_css_image_linear_compute (GtkCssImage     *image,
 
   copy = g_object_new (GTK_TYPE_CSS_IMAGE_LINEAR, NULL);
   copy->is_computed = TRUE;
+  copy->repeating = linear->repeating;
 
   _gtk_css_number_compute (&copy->angle, &linear->angle, context);
   
diff --git a/gtk/gtkcssimagelinearprivate.h b/gtk/gtkcssimagelinearprivate.h
index 67191b1..f664c5b 100644
--- a/gtk/gtkcssimagelinearprivate.h
+++ b/gtk/gtkcssimagelinearprivate.h
@@ -51,6 +51,7 @@ struct _GtkCssImageLinear
   GtkCssNumber angle; /* warning: We use GTK_CSS_NUMBER as an enum for the corners */
   GArray *stops;
   guint is_computed :1;
+  guint repeating :1;
 };
 
 struct _GtkCssImageLinearClass