Generalize refresh-every as refresh-rate

Since white text on black background can produce much more ghosting that
the opposite, we need to generalize the `refresh-every` setting in order
to be able to specify a separate refresh rate for each context.

src/settings/mod.rs

@@ -214,17 +214,24 @@ pub struct HomeSettings {
  pub hooks: Vec<Hook>,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default, rename_all = "kebab-case")]
+pub struct RefreshRateSettings {
+ pub regular: u8,
+ pub inverted: u8,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(default, rename_all = "kebab-case")]
 pub struct ReaderSettings {
- pub refresh_every: u8,
  pub finished: FinishedAction,
  pub font_path: String,
  pub font_family: String,
  pub font_size: f32,
  pub text_align: TextAlign,
  pub margin_width: i32,
  pub line_height: f32,
+ pub refresh_rate: RefreshRateSettings,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -251,10 +258,19 @@ impl Default for HomeSettings {
  }
 }
 
+impl Default for RefreshRateSettings {
+ fn default() -> Self {
+ RefreshRateSettings {
+ regular: 8,
+ inverted: 2,
+ }
+ }
+}
+
 impl Default for ReaderSettings {
  fn default() -> Self {
  ReaderSettings {
- refresh_every: 8,
+ refresh_rate: RefreshRateSettings::default(),
  finished: FinishedAction::Notify,
  font_path: DEFAULT_FONT_PATH.to_string(),
  font_family: DEFAULT_FONT_FAMILY.to_string(),