Add custom color themes (#63)

* Add custom color themes

* Tweak changelog entry

* Reformat code

---------

Co-authored-by: Ralf Fuest <mail@rfuest.de>

Author: eflukx

CHANGELOG.md

@@ -8,6 +8,7 @@
 
 ### Added
 
+- [#63] Added support for custom binary color themes (`BinaryColorTheme::Custom`).
 - [#62] Added an SDL based audio example (sdl-audio.rs).
 
 ## [0.7.0] - 2024-09-10

examples/sdl-audio.rs

@@ -49,7 +49,9 @@ fn main() -> Result<(), core::convert::Infallible> {
     let audio_subsystem = sdl.audio().unwrap();
 
     // Start audio playback by opening the device and setting the custom callback.
-    let audio_device = audio_subsystem.open_playback(None, &audio_spec, |_| audio_wrapper).unwrap();
+    let audio_device = audio_subsystem
+        .open_playback(None, &audio_spec, |_| audio_wrapper)
+        .unwrap();
     audio_device.resume();
 
     let output_settings = OutputSettingsBuilder::new()

src/theme.rs

@@ -24,6 +24,14 @@ pub enum BinaryColorTheme {
 
     /// An on/off OLED-like display with a dark blue background and light blue pixels
     OledBlue,
+
+    /// Custom binary color theme/mapping
+    Custom {
+        /// The color used for the "off" state pixels.
+        color_off: Rgb888,
+        /// The color used for the "on" state pixels.
+        color_on: Rgb888,
+    },
 }
 
 fn map_color(color: Rgb888, color_off: Rgb888, color_on: Rgb888) -> Rgb888 {
@@ -38,6 +46,10 @@ impl BinaryColorTheme {
     pub(crate) fn convert(self, color: Rgb888) -> Rgb888 {
         match self {
             BinaryColorTheme::Default => color,
+            BinaryColorTheme::Custom {
+                color_off,
+                color_on,
+            } => map_color(color, color_off, color_on),
             BinaryColorTheme::Inverted => {
                 Rgb888::new(255 - color.r(), 255 - color.g(), 255 - color.b())
             }