feat(ws2812spi): Implement invert

Author: alixinne

README.md

@@ -26,7 +26,7 @@ Programming Language. This version features:
 Currently implemented features:
 
 * Loading settings from the hyperion.ng database
-* Basic WS2812SPI device (no invert, no latch time)
+* WS2812SPI device (no latch time)
 * JSON, Protobuf, Flatbuffers and Boblight server
 * Black border detector, color channel adjustments, smoothing
 

src/instance/device/ws2812spi.rs

@@ -4,7 +4,6 @@ use spidev::{SpiModeFlags, Spidev, SpidevOptions, SpidevTransfer};
 use super::{common::*, DeviceError};
 use crate::models;
 
-// TODO: Support invert
 // TODO: Support latch_time
 
 pub type Ws2812SpiDevice = Rewriter<Ws2812SpiImpl>;
@@ -68,6 +67,12 @@ impl WritingDevice for Ws2812SpiImpl {
             *dst = 0;
         }
 
+        if config.invert {
+            for byte in &mut self.buf  {
+                *byte = !*byte;
+            }
+        }
+
         Ok(())
     }