From 3bf7ebc99720d940baeca66d1983014a099d9b82 Mon Sep 17 00:00:00 2001
From: Victoria Fischer <tdfischer@hackerbots.net>
Date: Mon, 5 Jan 2026 13:03:58 +0100
Subject: [PATCH] graphics: ssd1306: fix crash in dithering

---
 src/graphics/ssd1306.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/graphics/ssd1306.rs b/src/graphics/ssd1306.rs
index 6d1bbf7..dd42b10 100644
--- a/src/graphics/ssd1306.rs
+++ b/src/graphics/ssd1306.rs
@@ -38,7 +38,7 @@ impl SsdPixel {
     }
 }
 
-const DITHER_MAP: [u32;15] = [
+const DITHER_MAP: [u16;15] = [
     0b1000_0000_0000_0000,
     0b1000_0000_0010_0000,
     0b1010_0000_0010_0000,
@@ -62,9 +62,9 @@ impl AdditivePixelSink<BinaryColor> for SsdPixel {
             0 => (),
             255 => self.set_pixel(pixel),
             _ => {
-                let dither_value = DITHER_MAP[opacity as usize / 16];
+                let dither_value = DITHER_MAP[opacity as usize / 17];
                 let dither_x = self.coords.x % 4;
-                let dither_y = self.coords.x % 4;
+                let dither_y = self.coords.y % 4;
                 if dither_value.shr(dither_x).shr(dither_y * 4).bitand(0x01) == 1 {
                     self.set_pixel(pixel);
                 }