+pub struct GenericCache<T: Copy> {
+ pub height: usize,
+ pub stride: usize,
+ pub xpos: usize,
+ pub data: Vec<T>,
+ pub default: T,
+}
+
+impl<T:Copy> GenericCache<T> {
+ pub fn new(height: usize, stride: usize, default: T) -> Self {
+ let mut ret = Self {
+ stride,
+ height,
+ xpos: 0,
+ data: Vec::with_capacity((height + 1) * stride),
+ default,
+ };
+ ret.reset();
+ ret
+ }
+ pub fn full_size(&self) -> usize { self.stride * (self.height + 1) }
+ pub fn reset(&mut self) {
+ self.data.truncate(0);
+ let size = self.full_size();
+ self.data.resize(size, self.default);
+ self.xpos = self.stride + 1;
+ }
+ pub fn update_row(&mut self) {
+ for i in 0..self.stride {
+ self.data[i] = self.data[self.height * self.stride + i];
+ }
+ self.data.truncate(self.stride);
+ let size = self.full_size();
+ self.data.resize(size, self.default);
+ self.xpos = self.stride + 1;
+ }
+}
+