Remove unwraps, replace with as coercion (#105)

* Remove unwraps, replace with `as` coercion

* Changelog entry

Author: jamwaffles

CHANGELOG.md

@@ -6,6 +6,10 @@
 
 ## [Unreleased] - ReleaseDate
 
+### Changed
+
+- [#105](https://github.com/jamwaffles/ssd1306/pull/105) Reduce flash usage by around 400 bytes by replacing some internal `unwrap()`s with `as` coercions.
+
 ## [0.3.0-alpha.4] - 2020-02-07
 
 ### Added

src/mode/graphics.rs

@@ -275,8 +275,6 @@ where
     }
 }
 
-#[cfg(feature = "graphics")]
-use core::convert::TryInto;
 #[cfg(feature = "graphics")]
 use embedded_graphics::{
     drawable,
@@ -297,16 +295,13 @@ where
         let drawable::Pixel(pos, color) = pixel;
 
         // Guard against negative values. All positive i32 values from `pos` can be represented in
-        // the `u32`s that `set_pixel()` accepts.
+        // the `u32`s that `set_pixel()` accepts...
         if pos.x < 0 || pos.y < 0 {
             return;
         }
 
-        self.set_pixel(
-            (pos.x).try_into().unwrap(),
-            (pos.y).try_into().unwrap(),
-            RawU1::from(color).into_inner(),
-        );
+        // ... which makes the `as` coercions here safe.
+        self.set_pixel(pos.x as u32, pos.y as u32, RawU1::from(color).into_inner());
     }
 
     fn size(&self) -> Size {