Add shortcuts to toggle antialiasing (ArturKovacs#149)

* Add shortcuts to toggle antialiasing

* Update help image

* Store antialiasing setting in cfg.toml

* Revert "Update help image"

This reverts commit bb05065.

* Update help popup

* "previous" value to preserve antialiasing setting
when reopening emulsion

* Use constant for texel size threshold

src/configuration.rs

@@ -21,9 +21,31 @@ impl Theme {
 	}
 }
 
+#[derive(Debug, Copy, Clone, PartialEq, Serialize, Deserialize)]
+pub enum Antialias {
+	#[serde(rename = "auto")]
+	Auto,
+	#[serde(rename = "always")]
+	Always,
+	#[serde(rename = "never")]
+	Never,
+}
+
+impl Default for Antialias {
+	fn default() -> Self {
+		Antialias::Auto
+	}
+}
+
 #[derive(Debug, Default, PartialEq, Clone, Serialize, Deserialize)]
 pub struct CacheImageSection {
 	pub fit_stretches: bool,
+	pub antialiasing: Antialias,
+}
+
+#[derive(Debug, Default, PartialEq, Clone, Serialize, Deserialize)]
+pub struct ConfigImageSection {
+	pub antialiasing: Option<String>,
 }
 
 #[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
@@ -196,6 +218,7 @@ pub struct Configuration {
 	pub commands: Option<Vec<Command>>,
 	pub updates: Option<ConfigUpdateSection>,
 	pub title: Option<TitleSection>,
+	pub image: Option<ConfigImageSection>,
 }
 
 impl Configuration {

src/input_handling.rs

@@ -19,6 +19,8 @@ pub static PAN_NAME: &str = "pan";
 pub static PLAY_ANIM_NAME: &str = "play_anim";
 pub static PLAY_PRESENT_NAME: &str = "play_present";
 pub static PLAY_PRESENT_RND_NAME: &str = "play_present_rnd";
+pub static TOGGLE_ANTIALIAS: &str = "toggle_antialias";
+pub static SET_AUTOMATIC_ANTIALIAS: &str = "automatic_antialias";
 
 lazy_static! {
 	pub static ref DEFAULT_BINDINGS: HashMap<&'static str, Vec<&'static str>> = {
@@ -35,6 +37,8 @@ lazy_static! {
 		m.insert(PLAY_ANIM_NAME, vec!["Alt+A", "Alt+V"]);
 		m.insert(PLAY_PRESENT_NAME, vec!["P"]);
 		m.insert(PLAY_PRESENT_RND_NAME, vec!["Alt+P"]);
+		m.insert(TOGGLE_ANTIALIAS, vec!["S"]);
+		m.insert(SET_AUTOMATIC_ANTIALIAS, vec!["Alt+S"]);
 		m
 	};
 }