add VeraImage flip functions

vera/src/imageset.rs

@@ -131,6 +131,9 @@ pub struct VeraImage {
 	pub foreground: u8,
 	/// Background colour on 1BPP mode
 	pub background: u8,
+	/// Also store hashes of each rotation
+	/// 90, 180, 270
+	pub rotation_hashes: [u64; 3],
 }
 
 impl Hash for VeraImage {
@@ -191,10 +194,11 @@ impl VeraImage {
 			depth: VeraPixelDepth::BPP8,
 			foreground: 0,
 			background: 0,
+			rotation_hashes: [0; 3],
 		}
 	}
 
-	/// push an pixel value
+	/// push a pixel value
 	pub fn push_pixel(&mut self, r: u8, g: u8, b: u8, pal_index: Option<u8>) {
 		self.data.push(VeraPixel {
 			r,
@@ -234,6 +238,34 @@ impl VeraImage {
 		self.hash(&mut hasher);
 		hasher.finish()
 	}
+
+	/// Return a new image from this one, horizontally flipped
+	pub fn h_flip(&self) -> VeraImage {
+		let mut ret = self.clone();
+		ret.data = vec![];
+		let width = self.width as usize;
+		let height = self.height as usize;
+		for j in 0..height {
+			for i in (0..width).rev() {
+				ret.data.push(self.data[j * width + i].clone());
+			}
+		}
+		ret
+	}
+
+	/// Return a new image from this one, vertically flipped
+	pub fn v_flip(&self) -> VeraImage {
+		let mut ret = self.clone();
+		ret.data = vec![];
+		let width = self.width as usize;
+		let height = self.height as usize;
+		for j in (0..height).rev() {
+			for i in 0..width {
+				ret.data.push(self.data[j * width + i].clone());
+			}
+		}
+		ret
+	}
 }
 
 #[derive(Clone, Copy, Debug)]

vera/tests/imageset.rs

@@ -344,25 +344,40 @@ fn imageset_pal_64_4bpp() -> Result<(), Error> {
 	Ok(())
 }
 
-/*#[test]
-fn imageset_crash() -> Result<(), Error> {
-	let test_png = include_bytes!("data/imageset/crash-test-pal.png");
+#[test]
+fn image_flip() -> Result<(), Error> {
+	let test_png = include_bytes!("data/imageset/indexed-4bpp-pal-64.png");
 	let pal_config = VeraPaletteLoadConfig {
 		direct_load: true,
 		include_defaults: false,
 		sort: false,
 		..VeraPaletteLoadConfig::default()
 	};
 	let palette = VeraPalette::derive_from_png("pal", test_png.to_vec(), &pal_config)?;
-	println!("{}", palette);
 
-	let imageset_png = include_bytes!("data/imageset/crash-test-imageset.png");
-	let mut set = VeraImageSet::new("imageset_1", 16, 16);
+	let mut set = VeraImageSet::new("imageset_1", 8, 8);
 	let config = VeraImageSetLoadConfig::default();
-	set.load_from_png(imageset_png.to_vec(), &config)?;
+
+	set.load_from_png(test_png.to_vec(), &config)?;
 	set.format_indices(&palette, VeraPixelDepth::BPP4)?;
-	println!("{}", set);
 
-	Ok(())
+	let orig = set.frame_data[2].clone();
+	println!("{}", orig);
+	let h_flipped = orig.h_flip();
+	println!("{}", h_flipped);
+	assert_eq!(h_flipped.data[7].pal_index, Some(7));
+	let v_flipped = h_flipped.v_flip();
+	println!("{}", v_flipped);
+	assert_eq!(v_flipped.data[63].pal_index, Some(7));
+
+	let orig = set.frame_data[3].clone();
+	println!("{}", orig);
+	let h_flipped = orig.h_flip();
+	println!("{}", h_flipped);
+	assert_eq!(h_flipped.data[7].pal_index, Some(2));
+	let v_flipped = h_flipped.v_flip();
+	println!("{}", v_flipped);
+	assert_eq!(v_flipped.data[63].pal_index, Some(2));
 
-}*/
+	Ok(())
+}