some commenting

* src/ui/theme.c: some commenting

svn path=/trunk/; revision=4122

src/ui/theme.c

@@ -5236,16 +5236,6 @@ meta_theme_draw_frame_by_name (MetaTheme              *theme,
                          mini_icon, icon);
 }
 
-
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-
 void
 meta_theme_get_frame_borders (MetaTheme      *theme,
                               MetaFrameType   type,
@@ -5542,6 +5532,15 @@ meta_theme_define_color_constant (MetaTheme   *theme,
   return TRUE;
 }
 
+/**
+ * Looks up a colour constant.
+ *
+ * \param theme  the theme containing the constant
+ * \param name  the name of the constant
+ * \param value  [out] the string representation of the colour, or NULL if it
+ *               doesn't exist
+ * \return  TRUE if it exists, FALSE otherwise
+ */
 gboolean
 meta_theme_lookup_color_constant (MetaTheme   *theme,
                                   const char  *name,
@@ -5588,6 +5587,13 @@ meta_gtk_widget_get_font_desc (GtkWidget *widget,
   return font_desc;
 }
 
+/**
+ * Returns the height of the letters in a particular font.
+ *
+ * \param font_desc  the font
+ * \param context  the context of the font
+ * \return  the height of the letters
+ */
 int
 meta_pango_font_desc_get_text_height (const PangoFontDescription *font_desc,
                                       PangoContext         *context)
@@ -6133,6 +6139,13 @@ meta_gtk_arrow_to_string (GtkArrowType arrow)
   return "<unknown>";
 }
 
+/**
+ * Returns a fill_type from a string.  The inverse of
+ * meta_image_fill_type_to_string().
+ *
+ * \param str  a string representing a fill_type
+ * \result  the fill_type, or -1 if it represents no fill_type.
+ */
 MetaImageFillType
 meta_image_fill_type_from_string (const char *str)
 {
@@ -6144,6 +6157,13 @@ meta_image_fill_type_from_string (const char *str)
     return -1;
 }
 
+/**
+ * Returns a string representation of a fill_type.  The inverse of
+ * meta_image_fill_type_from_string().
+ *
+ * \param fill_type  the fill type
+ * \result  a string representing that type
+ */
 const char*
 meta_image_fill_type_to_string (MetaImageFillType fill_type)
 {
@@ -6158,7 +6178,15 @@ meta_image_fill_type_to_string (MetaImageFillType fill_type)
   return "<unknown>";
 }
 
-/* gtkstyle.c cut-and-pastage */
+/**
+ * Takes a colour "a", scales the lightness and saturation by a certain amount,
+ * and sets "b" to the resulting colour.
+ * gtkstyle.c cut-and-pastage.
+ *
+ * \param a  the starting colour
+ * \param b  [out] the resulting colour
+ * \param k  amount to scale lightness and saturation by
+ */ 
 static void
 gtk_style_shade (GdkColor *a,
                  GdkColor *b,
@@ -6193,6 +6221,13 @@ gtk_style_shade (GdkColor *a,
   b->blue = blue * 65535.0;
 }
 
+/**
+ * Converts a red/green/blue triplet to a hue/lightness/saturation triplet.
+ *
+ * \param r  on input, red; on output, hue
+ * \param g  on input, green; on output, lightness
+ * \param b  on input, blue; on output, saturation
+ */
 static void
 rgb_to_hls (gdouble *r,
             gdouble *g,
@@ -6264,6 +6299,13 @@ rgb_to_hls (gdouble *r,
   *b = s;
 }
 
+/**
+ * Converts a hue/lightness/saturation triplet to a red/green/blue triplet.
+ *
+ * \param h  on input, hue; on output, red
+ * \param l  on input, lightness; on output, green
+ * \param s  on input, saturation; on output, blue
+ */
 static void
 hls_to_rgb (gdouble *h,
             gdouble *l,
@@ -6552,6 +6594,14 @@ draw_bg_gradient_composite (const MetaTextureSpec *bg,
 }
 #endif
 
+/**
+ * Returns the earliest version of the theme format which required support
+ * for a particular button.  (For example, "shade" first appeared in v2, and
+ * "close" in v1.)
+ *
+ * \param type  the button type
+ * \return  the number of the theme format
+ */
 guint
 meta_theme_earliest_version_with_button (MetaButtonType type)
 {