[mutter] theme: Add helper functions for light/dark colors

[Florian MÃllner <fmuellner src gnome org>]

commit f8d900c3eae9ea9c028ff663e7451b0e888969e9
Author: Florian MÃllner <fmuellner gnome org>
Date:   Wed May 18 21:22:03 2011 +0200

    theme: Add helper functions for light/dark colors
    
    GtkStyleContext no longer has dark/light colors GtkStyle used to
    have. We already have compatibility code for them in theme.c, so
    add two helper functions to make it available outside theme.c.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=650586

 src/ui/theme-private.h |    7 +++++
 src/ui/theme.c         |   68 ++++++++++++++++++++++++++++-------------------
 2 files changed, 47 insertions(+), 28 deletions(-)
---
diff --git a/src/ui/theme-private.h b/src/ui/theme-private.h
index 92b9b21..b2e7bb4 100644
--- a/src/ui/theme-private.h
+++ b/src/ui/theme-private.h
@@ -1217,6 +1217,13 @@ const char*           meta_gtk_arrow_to_string         (GtkArrowType           a
 MetaImageFillType     meta_image_fill_type_from_string (const char            *str);
 const char*           meta_image_fill_type_to_string   (MetaImageFillType      fill_type);
 
+void                  meta_gtk_style_get_light_color   (GtkStyleContext      *style,
+                                                        GtkStateFlags         state,
+                                                        GdkRGBA              *color);
+void                  meta_gtk_style_get_dark_color    (GtkStyleContext      *style,
+                                                        GtkStateFlags         state,
+                                                        GdkRGBA              *color);
+
 guint meta_theme_earliest_version_with_button (MetaButtonType type);
 
 
diff --git a/src/ui/theme.c b/src/ui/theme.c
index f040790..e9f6883 100644
--- a/src/ui/theme.c
+++ b/src/ui/theme.c
@@ -1415,12 +1415,31 @@ meta_color_spec_new_gtk (MetaGtkColorComponent component,
 /* Based on set_color() in gtkstyle.c */
 #define LIGHTNESS_MULT 1.3
 #define DARKNESS_MULT  0.7
+void
+meta_gtk_style_get_light_color (GtkStyleContext *style,
+                                GtkStateFlags    state,
+                                GdkRGBA         *color)
+{
+  gtk_style_context_get_background_color (style, state, color);
+  gtk_style_shade (color, color, LIGHTNESS_MULT);
+}
+
+void
+meta_gtk_style_get_dark_color (GtkStyleContext *style,
+                               GtkStateFlags    state,
+                               GdkRGBA         *color)
+{
+  gtk_style_context_get_background_color (style, state, color);
+  gtk_style_shade (color, color, DARKNESS_MULT);
+}
+
 static void
 meta_set_color_from_style (GdkRGBA               *color,
                            GtkStyleContext       *context,
                            GtkStateType           state,
                            MetaGtkColorComponent  component)
 {
+  GdkRGBA other;
   GtkStateFlags flags;
 
   switch (state)
@@ -1445,45 +1464,38 @@ meta_set_color_from_style (GdkRGBA               *color,
     {
     case META_GTK_COLOR_BG:
     case META_GTK_COLOR_BASE:
-    case META_GTK_COLOR_MID:
-    case META_GTK_COLOR_LIGHT:
-    case META_GTK_COLOR_DARK:
       gtk_style_context_get_background_color (context, flags, color);
       break;
     case META_GTK_COLOR_FG:
     case META_GTK_COLOR_TEXT:
+      gtk_style_context_get_color (context, flags, color);
+      break;
     case META_GTK_COLOR_TEXT_AA:
       gtk_style_context_get_color (context, flags, color);
+      meta_set_color_from_style (&other, context, state, META_GTK_COLOR_BASE);
+
+      color->red = (color->red + other.red) / 2;
+      color->green = (color->green + other.green) / 2;
+      color->blue = (color->blue + other.blue) / 2;
+      break;
+    case META_GTK_COLOR_MID:
+      meta_gtk_style_get_light_color (context, flags, color);
+      meta_gtk_style_get_dark_color (context, flags, &other);
+
+      color->red = (color->red + other.red) / 2;
+      color->green = (color->green + other.green) / 2;
+      color->blue = (color->blue + other.blue) / 2;
+      break;
+    case META_GTK_COLOR_LIGHT:
+      meta_gtk_style_get_light_color (context, flags, color);
+      break;
+    case META_GTK_COLOR_DARK:
+      meta_gtk_style_get_dark_color (context, flags, color);
       break;
     case META_GTK_COLOR_LAST:
       g_assert_not_reached ();
       break;
     }
-
-  if (component == META_GTK_COLOR_LIGHT)
-    gtk_style_shade (color, color, LIGHTNESS_MULT);
-  else if (component == META_GTK_COLOR_DARK)
-    gtk_style_shade (color, color, DARKNESS_MULT);
-  else if (component == META_GTK_COLOR_MID)
-    {
-      GdkRGBA light, dark;
-
-      gtk_style_shade (color, &light, LIGHTNESS_MULT);
-      gtk_style_shade (color, &dark, DARKNESS_MULT);
-
-      color->red = (light.red + dark.red) / 2;
-      color->green = (light.green + dark.green) / 2;
-      color->blue = (light.blue + dark.blue) / 2;
-    }
-  else if (component == META_GTK_COLOR_TEXT_AA)
-    {
-      GdkRGBA base;
-
-      meta_set_color_from_style (&base, context, state, META_GTK_COLOR_BASE);
-      color->red = (color->red + base.red) / 2;
-      color->green = (color->green + base.green) / 2;
-      color->blue = (color->blue + base.blue) / 2;
-    }
 }
 
 void