Added support for partial window tracking

src/lib.rs

@@ -58,9 +58,10 @@ impl Frame {
     }
 }
 
-pub struct DoubleFrame {
+pub struct DoubleFrame<PartialWindow> {
     old: Frame,
     new: Frame,
+    partial_window: PartialWindow,
 }
 
 pub enum PixelColour {
@@ -68,13 +69,126 @@ pub enum PixelColour {
     White = 1,
 }
 
-impl DoubleFrame {
+pub trait ApplyParitalWindow: private::Sealed {
+    fn apply<
+        BusyPin: InputPin,
+        ResetPin: OutputPin,
+        DcPin: OutputPin,
+        Spi: SpiDevice,
+        Delay: DelayNs,
+    >(
+        &self,
+        display: &mut EPaperDisplay<BusyPin, ResetPin, DcPin, Spi, Delay>,
+    );
+
+    fn update_partial_window(&mut self, min_x: u16, max_x: u16, min_y: u16, max_y: u16);
+
+    fn reset_partial_window(&mut self);
+}
+
+mod private {
+    pub(super) trait Sealed {}
+
+    impl Sealed for super::NoPartialWindow {}
+
+    impl Sealed for super::AutomaticPartialWindow {}
+}
+
+pub struct NoPartialWindow;
+
+impl ApplyParitalWindow for NoPartialWindow {
+    fn apply<
+        BusyPin: InputPin,
+        ResetPin: OutputPin,
+        DcPin: OutputPin,
+        Spi: SpiDevice,
+        Delay: DelayNs,
+    >(
+        &self,
+        _display: &mut EPaperDisplay<BusyPin, ResetPin, DcPin, Spi, Delay>,
+    ) {
+    }
+
+    fn update_partial_window(&mut self, _min_x: u16, _max_x: u16, _min_y: u16, _max_y: u16) {}
+
+    fn reset_partial_window(&mut self) {}
+}
+
+pub struct AutomaticPartialWindow {
+    min_x: u16,
+    max_x: u16,
+    min_y: u16,
+    max_y: u16,
+}
+
+impl ApplyParitalWindow for AutomaticPartialWindow {
+    fn apply<
+        BusyPin: InputPin,
+        ResetPin: OutputPin,
+        DcPin: OutputPin,
+        Spi: SpiDevice,
+        Delay: DelayNs,
+    >(
+        &self,
+        display: &mut EPaperDisplay<BusyPin, ResetPin, DcPin, Spi, Delay>,
+    ) {
+        let hrst = self.min_x as u8 & 0b11111000;
+        let hred = self.max_x as u8 | 0b111;
+        let vrst = self.min_y & 0x1FF;
+        let vred = self.max_y & 0x1FF;
+        display.write_command(0x90);
+        display.write_data(hrst);
+        display.write_data(hred);
+        display.write_data((vrst >> 8) as u8);
+        display.write_data((vrst & 0xFF) as u8);
+        display.write_data((vred >> 8) as u8);
+        display.write_data((vred & 0xFF) as u8);
+        display.write_data(0x00);
+    }
+    
+    fn update_partial_window(&mut self, min_x: u16, max_x: u16, min_y: u16, max_y: u16) {
+        self.min_x = core::cmp::min(self.min_x, min_x);
+        self.max_x = core::cmp::max(self.max_x, max_x);
+        self.min_y = core::cmp::min(self.min_y, min_y);
+        self.max_y = core::cmp::max(self.max_y, max_y);
+    }
+    
+    fn reset_partial_window(&mut self) {
+        *self = AutomaticPartialWindow {
+            min_x: EPD_WIDTH as u16,
+            max_x: 0,
+            min_y: EPD_HEIGHT as u16,
+            max_y: 0,
+        }
+    }
+}
+
+impl DoubleFrame<NoPartialWindow> {
     pub fn new(old: Frame, new: Frame) -> Self {
-        Self { old, new }
+        Self {
+            old,
+            new,
+            partial_window: NoPartialWindow,
+        }
     }
 
     pub fn draw_pixel(&mut self, x: usize, y: usize, colour: PixelColour) {
+        todo!()
+    }
+}
 
+impl DoubleFrame<AutomaticPartialWindow> {
+    pub fn new_with_automatic_partial_window(old: Frame, new: Frame) -> Self {
+        Self {
+            old,
+            new,
+            partial_window: AutomaticPartialWindow {
+                min_x: EPD_WIDTH as u16,
+                max_x: 0,
+                min_y: EPD_HEIGHT as u16,
+                max_y: 0,
+            },
+        }
     }
 }
 
@@ -158,7 +272,8 @@ impl<BusyPin: InputPin, ResetPin: OutputPin, DcPin: OutputPin, Spi: SpiDevice, D
         self.wait_for_display();
     }
 
-    pub fn draw_full_frame(&mut self, double_frame: &mut DoubleFrame) {
+    pub fn draw_full_frame<PartialWindow: ApplyParitalWindow>(&mut self, double_frame: &mut DoubleFrame<PartialWindow>) {
+        double_frame.partial_window.apply(self);
         self.write_command(0x10);
         for byte in double_frame.old.0 {
             self.write_data(byte);
@@ -183,4 +298,12 @@ impl<BusyPin: InputPin, ResetPin: OutputPin, DcPin: OutputPin, Spi: SpiDevice, D
         self.write_command(0x07);
         self.write_data(0xA5);
     }
+
+    pub fn enable_partial_mode(&mut self) {
+        self.write_command(0x91);
+    }
+
+    pub fn disable_partial_mode(&mut self) {
+        self.write_command(0x92);
+    }
 }