| 1 | pub struct GenericCache<T: Copy> { |
| 2 | pub height: usize, |
| 3 | pub stride: usize, |
| 4 | pub xpos: usize, |
| 5 | pub data: Vec<T>, |
| 6 | pub default: T, |
| 7 | } |
| 8 | |
| 9 | impl<T:Copy> GenericCache<T> { |
| 10 | pub fn new(height: usize, stride: usize, default: T) -> Self { |
| 11 | let mut ret = Self { |
| 12 | stride, |
| 13 | height, |
| 14 | xpos: 0, |
| 15 | data: Vec::with_capacity((height + 1) * stride), |
| 16 | default, |
| 17 | }; |
| 18 | ret.reset(); |
| 19 | ret |
| 20 | } |
| 21 | pub fn full_size(&self) -> usize { self.stride * (self.height + 1) } |
| 22 | pub fn reset(&mut self) { |
| 23 | self.data.truncate(0); |
| 24 | let size = self.full_size(); |
| 25 | self.data.resize(size, self.default); |
| 26 | self.xpos = self.stride + 1; |
| 27 | } |
| 28 | pub fn update_row(&mut self) { |
| 29 | for i in 0..self.stride { |
| 30 | self.data[i] = self.data[self.height * self.stride + i]; |
| 31 | } |
| 32 | self.data.truncate(self.stride); |
| 33 | let size = self.full_size(); |
| 34 | self.data.resize(size, self.default); |
| 35 | self.xpos = self.stride + 1; |
| 36 | } |
| 37 | } |
| 38 | |