Add mirror (vertical flip) option (#161)

* Add mirror (vertical flip) option * Change the description * Swap 90d and 270d * Add changelog entry
rust-embedded-community · Feb 10, 2022 · 01e8b5a · 01e8b5a
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,10 @@
 
 ## [Unreleased] - ReleaseDate
 
+### Added
+
+- [#161](https://github.com/jamwaffles/ssd1306/pull/161) Added a `set_mirror` method to enable or disable display mirroring.
+
 ## [0.7.0] - 2021-07-08
 
 ### Changed

diff --git a/src/lib.rs b/src/lib.rs
@@ -314,6 +314,33 @@ where
         Ok(())
     }
 
+    /// Set mirror enabled/disabled.
+    pub fn set_mirror(&mut self, mirror: bool) -> Result<(), DisplayError> {
+        if mirror {
+            match self.rotation {
+                DisplayRotation::Rotate0 => {
+                    Command::SegmentRemap(false).send(&mut self.interface)?;
+                    Command::ReverseComDir(true).send(&mut self.interface)?;
+                }
+                DisplayRotation::Rotate90 => {
+                    Command::SegmentRemap(false).send(&mut self.interface)?;
+                    Command::ReverseComDir(false).send(&mut self.interface)?;
+                }
+                DisplayRotation::Rotate180 => {
+                    Command::SegmentRemap(true).send(&mut self.interface)?;
+                    Command::ReverseComDir(false).send(&mut self.interface)?;
+                }
+                DisplayRotation::Rotate270 => {
+                    Command::SegmentRemap(true).send(&mut self.interface)?;
+                    Command::ReverseComDir(true).send(&mut self.interface)?;
+                }
+            };
+        } else {
+            self.set_rotation(self.rotation)?;
+        }
+        Ok(())
+    }
+
     /// Change the display brightness.
     pub fn set_brightness(&mut self, brightness: Brightness) -> Result<(), DisplayError> {
         // Should be moved to Brightness::new once conditions can be used in const functions