Move renderable cell transformation to alacritty

This refactors a large chunk of the alacritty_terminal API to expose all
data necessary for rendering uniformly through the `renderable_content`
call. This also no longer transforms the cells for rendering by a GUI
but instead just reports the content from a terminal emulation
perspective. The transformation into renderable cells is now done inside
the alacritty crate.

Since the terminal itself only ever needs to know about modified color
RGB values, the configuration for colors was moved to the alacritty UI
code.

1 files changed, 70 insertions, 0 deletions

diff --git a/alacritty/src/config/bell.rs b/alacritty/src/config/bell.rs
new file mode 100644
index 00000000..2516e2b3
--- /dev/null
+++ b/alacritty/src/config/bell.rs
@@ -0,0 +1,70 @@
+use std::time::Duration;
+
+use alacritty_config_derive::ConfigDeserialize;
+
+use alacritty_terminal::config::Program;
+use alacritty_terminal::term::color::Rgb;
+
+#[derive(ConfigDeserialize, Clone, Debug, PartialEq, Eq)]
+pub struct BellConfig {
+    /// Visual bell animation function.
+    pub animation: BellAnimation,
+
+    /// Command to run on bell.
+    pub command: Option<Program>,
+
+    /// Visual bell flash color.
+    pub color: Rgb,
+
+    /// Visual bell duration in milliseconds.
+    duration: u16,
+}
+
+impl Default for BellConfig {
+    fn default() -> Self {
+        Self {
+            color: Rgb { r: 255, g: 255, b: 255 },
+            animation: Default::default(),
+            command: Default::default(),
+            duration: Default::default(),
+        }
+    }
+}
+
+impl BellConfig {
+    pub fn duration(&self) -> Duration {
+        Duration::from_millis(self.duration as u64)
+    }
+}
+
+/// `VisualBellAnimations` are modeled after a subset of CSS transitions and Robert
+/// Penner's Easing Functions.
+#[derive(ConfigDeserialize, Clone, Copy, Debug, PartialEq, Eq)]
+pub enum BellAnimation {
+    // CSS animation.
+    Ease,
+    // CSS animation.
+    EaseOut,
+    // Penner animation.
+    EaseOutSine,
+    // Penner animation.
+    EaseOutQuad,
+    // Penner animation.
+    EaseOutCubic,
+    // Penner animation.
+    EaseOutQuart,
+    // Penner animation.
+    EaseOutQuint,
+    // Penner animation.
+    EaseOutExpo,
+    // Penner animation.
+    EaseOutCirc,
+    // Penner animation.
+    Linear,
+}
+
+impl Default for BellAnimation {
+    fn default() -> Self {
+        BellAnimation::EaseOutExpo
+    }
+}