[gnome-shell/nbtk-introduction] ShellThemeNode: Add border-radius support

[Owen Taylor <otaylor src gnome org>]

commit 49ba54820c8191b26e9f938f4761a12795ef59b1
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Sun Sep 20 09:08:08 2009 -0400

    ShellThemeNode: Add border-radius support
    
    Add support for parsing and caching the border-radius property.
    Different radii for the 4 corners are supported; elliptical corners
    are not supported.

 src/toolkit/shell-theme-node.c |  115 ++++++++++++++++++++++++++++++++++++++-
 src/toolkit/shell-theme-node.h |   20 +++++--
 src/toolkit/test-theme.c       |   71 ++++++++++++++++++++++++
 src/toolkit/test-theme.css     |    4 ++
 4 files changed, 202 insertions(+), 8 deletions(-)
---
diff --git a/src/toolkit/shell-theme-node.c b/src/toolkit/shell-theme-node.c
index abea899..0e919fc 100644
--- a/src/toolkit/shell-theme-node.c
+++ b/src/toolkit/shell-theme-node.c
@@ -34,6 +34,7 @@ struct _ShellThemeNode {
   ClutterColor foreground_color;
   ClutterColor border_color[4];
   double border_width[4];
+  double border_radius[4];
   guint padding[4];
 
   char *background_image;
@@ -697,6 +698,96 @@ shell_theme_node_get_length (ShellThemeNode *node,
 }
 
 static void
+do_border_radius_term (ShellThemeNode *node,
+                       CRTerm         *term,
+                       gboolean        topleft,
+                       gboolean        topright,
+                       gboolean        bottomright,
+                       gboolean        bottomleft)
+{
+  gdouble value;
+
+  if (get_length_from_term (node, term, FALSE, &value) != VALUE_FOUND)
+    return;
+
+  if (topleft)
+    node->border_radius[SHELL_CORNER_TOPLEFT] = value;
+  if (topright)
+    node->border_radius[SHELL_CORNER_TOPRIGHT] = value;
+  if (bottomright)
+    node->border_radius[SHELL_CORNER_BOTTOMRIGHT] = value;
+  if (bottomleft)
+    node->border_radius[SHELL_CORNER_BOTTOMLEFT] = value;
+}
+
+static void
+do_border_radius (ShellThemeNode *node,
+                  CRDeclaration  *decl)
+{
+  const char *property_name = decl->property->stryng->str + 13; /* Skip 'border-radius' */
+
+  if (strcmp (property_name, "") == 0)
+    {
+      /* Slight deviation ... if we don't understand some of the terms and understand others,
+       * then we set the ones we understand and ignore the others instead of ignoring the
+       * whole thing
+       */
+      if (decl->value == NULL) /* 0 values */
+        return;
+      else if (decl->value->next == NULL) /* 1 value */
+        {
+          do_border_radius_term (node, decl->value,       TRUE, TRUE, TRUE, TRUE); /* all corners */
+          return;
+        }
+      else if (decl->value->next->next == NULL) /* 2 values */
+        {
+          do_border_radius_term (node, decl->value,       TRUE,  FALSE,  TRUE,  FALSE);  /* topleft/bottomright */
+          do_border_radius_term (node, decl->value->next, FALSE,  TRUE,   FALSE, TRUE);  /* topright/bottomleft */
+        }
+      else if (decl->value->next->next->next == NULL) /* 3 values */
+        {
+          do_border_radius_term (node, decl->value,             TRUE,  FALSE, FALSE, FALSE); /* topleft */
+          do_border_radius_term (node, decl->value->next,       FALSE, TRUE,  FALSE, TRUE);  /* topright/bottomleft */
+          do_border_radius_term (node, decl->value->next->next, FALSE, FALSE, TRUE,  FALSE);  /* bottomright */
+        }
+      else if (decl->value->next->next->next->next == NULL) /* 4 values */
+        {
+          do_border_radius_term (node, decl->value,                   TRUE,  FALSE, FALSE, FALSE); /* topleft */
+          do_border_radius_term (node, decl->value->next,             FALSE, TRUE,  FALSE, FALSE); /* topright */
+          do_border_radius_term (node, decl->value->next->next,       FALSE, FALSE, TRUE,  FALSE); /* bottomright */
+          do_border_radius_term (node, decl->value->next->next->next, FALSE, FALSE, FALSE, TRUE);  /* bottomleft */
+        }
+      else
+        {
+          g_warning ("Too many values for border-radius property");
+          return;
+        }
+    }
+  else
+    {
+      if (decl->value == NULL || decl->value->next != NULL)
+        return;
+
+      if (strcmp (property_name, "-topleft") == 0)
+        {
+          do_border_radius_term (node, decl->value, TRUE,  FALSE, FALSE, FALSE);
+        }
+      else if (strcmp (property_name, "-topright") == 0)
+        {
+          do_border_radius_term (node, decl->value, FALSE, TRUE,  FALSE, FALSE);
+        }
+      else if (strcmp (property_name, "-bottomright") == 0)
+        {
+          do_border_radius_term (node, decl->value, FALSE, FALSE, TRUE,  FALSE);
+        }
+      else if (strcmp (property_name, "-bottomleft") == 0)
+        {
+          do_border_radius_term (node, decl->value, FALSE, FALSE, FALSE, TRUE);
+        }
+    }
+}
+
+static void
 do_border_property (ShellThemeNode *node,
                     CRDeclaration  *decl)
 {
@@ -708,6 +799,12 @@ do_border_property (ShellThemeNode *node,
   gboolean width_set = FALSE;
   int j;
 
+  if (g_str_has_prefix (property_name, "-radius"))
+    {
+      do_border_radius (node, decl);
+      return;
+    }
+
   if (g_str_has_prefix (property_name, "-left"))
     {
       side = SHELL_SIDE_LEFT;
@@ -955,13 +1052,25 @@ shell_theme_node_get_border_width (ShellThemeNode *node,
                                    ShellSide       side)
 {
   g_return_val_if_fail (SHELL_IS_THEME_NODE (node), 0.);
-  g_return_val_if_fail (side >= SHELL_SIDE_LEFT && side <= SHELL_SIDE_BOTTOM, 0.);
+  g_return_val_if_fail (side >= SHELL_SIDE_TOP && side <= SHELL_SIDE_LEFT, 0.);
 
   ensure_borders (node);
 
   return node->border_width[side];
 }
 
+double
+shell_theme_node_get_border_radius (ShellThemeNode *node,
+                                    ShellCorner     corner)
+{
+  g_return_val_if_fail (SHELL_IS_THEME_NODE (node), 0.);
+  g_return_val_if_fail (corner >= SHELL_CORNER_TOPLEFT && corner <= SHELL_CORNER_BOTTOMLEFT, 0.);
+
+  ensure_borders (node);
+
+  return node->border_radius[corner];
+}
+
 static GetFromTermResult
 get_background_color_from_term (ShellThemeNode *node,
                                 CRTerm         *term,
@@ -1150,7 +1259,7 @@ shell_theme_node_get_border_color (ShellThemeNode *node,
                                    ClutterColor   *color)
 {
   g_return_if_fail (SHELL_IS_THEME_NODE (node));
-  g_return_if_fail (side >= SHELL_SIDE_LEFT && side <= SHELL_SIDE_BOTTOM);
+  g_return_if_fail (side >= SHELL_SIDE_TOP && side <= SHELL_SIDE_LEFT);
 
   ensure_borders (node);
 
@@ -1162,7 +1271,7 @@ shell_theme_node_get_padding (ShellThemeNode *node,
                               ShellSide      side)
 {
   g_return_val_if_fail (SHELL_IS_THEME_NODE (node), 0.);
-  g_return_val_if_fail (side >= SHELL_SIDE_LEFT && side <= SHELL_SIDE_BOTTOM, 0.);
+  g_return_val_if_fail (side >= SHELL_SIDE_TOP && side <= SHELL_SIDE_LEFT, 0.);
 
   ensure_borders (node);
 
diff --git a/src/toolkit/shell-theme-node.h b/src/toolkit/shell-theme-node.h
index 489295e..a05d68a 100644
--- a/src/toolkit/shell-theme-node.h
+++ b/src/toolkit/shell-theme-node.h
@@ -21,12 +21,19 @@ typedef struct _ShellThemeNodeClass ShellThemeNodeClass;
 #define SHELL_THEME_NODE_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj),     SHELL_TYPE_THEME_NODE, ShellThemeNodeClass))
 
 typedef enum {
-    SHELL_SIDE_LEFT,
-    SHELL_SIDE_RIGHT,
     SHELL_SIDE_TOP,
-    SHELL_SIDE_BOTTOM
+    SHELL_SIDE_RIGHT,
+    SHELL_SIDE_BOTTOM,
+    SHELL_SIDE_LEFT
 } ShellSide;
 
+typedef enum {
+    SHELL_CORNER_TOPLEFT,
+    SHELL_CORNER_TOPRIGHT,
+    SHELL_CORNER_BOTTOMRIGHT,
+    SHELL_CORNER_BOTTOMLEFT
+} ShellCorner;
+
 /* These are the CSS values; that doesn't mean we have to implement blink... */
 typedef enum {
     SHELL_TEXT_DECORATION_UNDERLINE    = 1 << 0,
@@ -89,11 +96,14 @@ void shell_theme_node_get_foreground_color (ShellThemeNode *node,
 
 const char *shell_theme_node_get_background_image (ShellThemeNode *node);
 
-double  shell_theme_node_get_border_width (ShellThemeNode *node,
+double shell_theme_node_get_border_width  (ShellThemeNode *node,
                                            ShellSide       side);
-void    shell_theme_node_get_border_color (ShellThemeNode *node,
+double shell_theme_node_get_border_radius (ShellThemeNode *node,
+                                           ShellCorner     corner);
+void   shell_theme_node_get_border_color  (ShellThemeNode *node,
                                            ShellSide       side,
                                            ClutterColor   *color);
+
 double  shell_theme_node_get_padding      (ShellThemeNode *node,
                                            ShellSide       side);
 
diff --git a/src/toolkit/test-theme.c b/src/toolkit/test-theme.c
index e4b1aeb..0518eca 100644
--- a/src/toolkit/test-theme.c
+++ b/src/toolkit/test-theme.c
@@ -112,6 +112,42 @@ assert_background_color (ShellThemeNode *node,
     }
 }
 
+static const char *
+side_to_string (ShellSide side)
+{
+  switch (side)
+    {
+    case SHELL_SIDE_TOP:
+      return "top";
+    case SHELL_SIDE_RIGHT:
+      return "right";
+    case SHELL_SIDE_BOTTOM:
+      return "bottom";
+    case SHELL_SIDE_LEFT:
+      return "left";
+    }
+
+  return "<unknown>";
+}
+
+static void
+assert_border_color (ShellThemeNode *node,
+                     const char     *node_description,
+                     ShellSide       side,
+                     guint32         expected)
+{
+  ClutterColor color;
+  shell_theme_node_get_border_color (node, side, &color);
+  guint32 value = clutter_color_to_pixel (&color);
+
+  if (expected != value)
+    {
+      g_print ("%s: %s.border-%s-color: expected: #%08x, got: #%08x\n",
+	       test, node_description, side_to_string (side), expected, value);
+      fail = TRUE;
+    }
+}
+
 static void
 assert_background_image (ShellThemeNode *node,
 			 const char     *node_description,
@@ -223,6 +259,40 @@ test_padding (void)
 }
 
 static void
+test_border (void)
+{
+  test = "border";
+
+  /* group2 is defined as having a thin black border along the top three
+   * sides with rounded joins, then a square-joined green border at the
+   * botttom
+   */
+
+  assert_length ("group2", "border-top-width", 2.,
+		 shell_theme_node_get_border_width (group2, SHELL_SIDE_TOP));
+  assert_length ("group2", "border-right-width", 2.,
+		 shell_theme_node_get_border_width (group2, SHELL_SIDE_RIGHT));
+  assert_length ("group2", "border-bottom-width", 5.,
+		 shell_theme_node_get_border_width (group2, SHELL_SIDE_BOTTOM));
+  assert_length ("group2", "border-left-width", 2.,
+		 shell_theme_node_get_border_width (group2, SHELL_SIDE_LEFT));
+
+  assert_border_color (group2, "group2", SHELL_SIDE_TOP,    0x000000ff);
+  assert_border_color (group2, "group2", SHELL_SIDE_RIGHT,  0x000000ff);
+  assert_border_color (group2, "group2", SHELL_SIDE_BOTTOM, 0x0000ffff);
+  assert_border_color (group2, "group2", SHELL_SIDE_LEFT,   0x000000ff);
+
+  assert_length ("group2", "border-radius-topleft", 10.,
+		 shell_theme_node_get_border_radius (group2, SHELL_CORNER_TOPLEFT));
+  assert_length ("group2", "border-radius-topright", 10.,
+		 shell_theme_node_get_border_radius (group2, SHELL_CORNER_TOPRIGHT));
+  assert_length ("group2", "border-radius-bottomright", 0.,
+		 shell_theme_node_get_border_radius (group2, SHELL_CORNER_BOTTOMRIGHT));
+  assert_length ("group2", "border-radius-bottomleft", 0.,
+		 shell_theme_node_get_border_radius (group2, SHELL_CORNER_BOTTOMLEFT));
+}
+
+static void
 test_background (void)
 {
   test = "background";
@@ -312,6 +382,7 @@ main (int argc, char **argv)
   test_type_inheritance ();
   test_adjacent_selector ();
   test_padding ();
+  test_border ();
   test_background ();
   test_font ();
   test_pseudo_class ();
diff --git a/src/toolkit/test-theme.css b/src/toolkit/test-theme.css
index be512d5..b2fad36 100644
--- a/src/toolkit/test-theme.css
+++ b/src/toolkit/test-theme.css
@@ -58,6 +58,10 @@ stage > #text2 {
 #group2 {
     background-image: url('other-background.png');
     padding: 1px 2px 3px 4px;
+
+    border: 2px solid #000000;
+    border-bottom: 5px solid #0000ff;
+    border-radius: 10px 10px 0px 0px;
 }
 
 ClutterText:hover {