Add color option to visual bell

This adds the option to specify the color of the visual bell using the
`visual_bell.color` configuration setting.

This is done by rendering a big quad over the entire screen, which also
opens up options to draw other arbitrary rectangles on the screen in the
future.

1 files changed, 17 insertions, 7 deletions

diff --git a/src/config.rs b/src/config.rs
index 39a5c024..d5eadcf8 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -157,13 +157,12 @@ pub struct VisualBellConfig {
     animation: VisualBellAnimation,
 
     /// Visual bell duration in milliseconds
-    #[serde(deserialize_with = "deserialize_visual_bell_duration")]
-    #[serde(default="default_visual_bell_duration")]
+    #[serde(default, deserialize_with = "deserialize_visual_bell_duration")]
     duration: u16,
-}
 
-fn default_visual_bell_duration() -> u16 {
-    150
+    /// Visual bell flash color
+    #[serde(default="default_visual_bell_color", deserialize_with = "rgb_from_hex")]
+    color: Rgb,
 }
 
 fn deserialize_visual_bell_duration<'a, D>(deserializer: D) -> ::std::result::Result<u16, D::Error>
@@ -173,11 +172,15 @@ fn deserialize_visual_bell_duration<'a, D>(deserializer: D) -> ::std::result::Re
         Ok(duration) => Ok(duration),
         Err(err) => {
             error!("problem with config: {}; Using default value", err);
-            Ok(default_visual_bell_duration())
+            Ok(0)
         },
     }
 }
 
+fn default_visual_bell_color() -> Rgb {
+    Rgb { r: 255, g: 255, b: 255 }
+}
+
 impl VisualBellConfig {
     /// Visual bell animation
     #[inline]
@@ -190,13 +193,20 @@ impl VisualBellConfig {
     pub fn duration(&self) -> Duration {
         Duration::from_millis(u64::from(self.duration))
     }
+
+    /// Visual bell flash color
+    #[inline]
+    pub fn color(&self) -> Rgb {
+        self.color
+    }
 }
 
 impl Default for VisualBellConfig {
     fn default() -> VisualBellConfig {
         VisualBellConfig {
             animation: VisualBellAnimation::default(),
-            duration: default_visual_bell_duration(),
+            color: default_visual_bell_color(),
+            duration: 0,
         }
     }
 }