Merge pull request #167 from boozook/api/color-convert

Add color convertion methods

api/color/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "playdate-color"
-version = "0.2.1"
+version = "0.2.2"
 readme = "README.md"
 description = "Color extension for Playdate API"
 keywords = ["playdate", "sdk", "api", "gamedev"]

api/color/src/lib.rs

@@ -3,6 +3,10 @@
 #![feature(impl_trait_in_assoc_type)]
 
 extern crate sys;
+use core::ptr::NonNull;
+use core::usize;
+
+use sys::error::NullPtrError;
 use sys::ffi::LCDColor;
 use sys::ffi::LCDPattern;
 use sys::ffi::LCDSolidColor;
@@ -34,6 +38,30 @@ impl<'t> From<Color<'t>> for LCDColor
 	}
 }
 
+impl<'t> TryFrom<LCDColor> for Color<'t>
+	where LCDColor: 't,
+	      Self: 't
+{
+	type Error = NullPtrError;
+
+	fn try_from(color: LCDColor) -> Result<Self, Self::Error> {
+		match color {
+			0 => Ok(Self::Solid(LCDSolidColor::Black())),
+			1 => Ok(Self::Solid(LCDSolidColor::White())),
+			2 => Ok(Self::Solid(LCDSolidColor::Clear())),
+			3 => Ok(Self::Solid(LCDSolidColor::XOR())),
+			color => {
+				NonNull::new(color as *mut LCDPattern).ok_or(NullPtrError)
+				                                      .map(|nn| Self::Pattern(unsafe { nn.as_ref() }))
+			},
+		}
+	}
+}
+
+impl<'t> From<&'t LCDPattern> for Color<'t> {
+	fn from(pattern: &'t LCDPattern) -> Self { Color::Pattern(pattern) }
+}
+
 
 #[const_trait]
 pub trait LCDColorExt {