Bits and bobs for #18 (#19)

src/dirs.rs

@@ -2,6 +2,7 @@ use bitflags::bitflags;
 
 bitflags! {
 	/// The possible values for a direction in DM.
+	#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 	pub struct Dirs: u8 {
 		const NORTH =	1 << 0;
 		const SOUTH =	1 << 1;

src/icon.rs

@@ -1,3 +1,4 @@
+use crate::dirs::Dirs;
 use crate::{error, ztxt, RawDmi};
 use image::codecs::png;
 use image::imageops;
@@ -8,13 +9,26 @@ use std::io::Cursor;
 use std::num::NonZeroU32;
 
 #[derive(Clone, Default, PartialEq, Debug)]
+/// A DMI Icon, which is a collection of [IconState]s.
 pub struct Icon {
 	pub version: DmiVersion,
 	pub width: u32,
 	pub height: u32,
 	pub states: Vec<IconState>,
 }
 
+/// The ordering of directions within a DMI file.
+pub const DIR_ORDERING: [Dirs; 8] = [
+	Dirs::SOUTH,
+	Dirs::NORTH,
+	Dirs::EAST,
+	Dirs::WEST,
+	Dirs::SOUTHEAST,
+	Dirs::SOUTHWEST,
+	Dirs::NORTHEAST,
+	Dirs::NORTHWEST,
+];
+
 impl Icon {
 	pub fn load<R: Read>(reader: R) -> Result<Icon, error::DmiError> {
 		let raw_dmi = RawDmi::load(reader)?;