fast image operations
Diffstat (limited to 'src/drawing/tri.rs')
| -rw-r--r-- | src/drawing/tri.rs | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/src/drawing/tri.rs b/src/drawing/tri.rs index 538d5ed..2a6a90b 100644 --- a/src/drawing/tri.rs +++ b/src/drawing/tri.rs @@ -21,14 +21,25 @@ impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> { /// ``` pub fn tri<F: Float<f32>>( &mut self, - b: impl Into<Vector2<F>>, a: impl Into<Vector2<F>>, + b: impl Into<Vector2<F>>, c: impl Into<Vector2<F>>, col: [u8; CHANNELS], ) { - let Vector2 { x: x1, y: y1 } = a.into(); - let Vector2 { x: x2, y: y2 } = b.into(); + let Vector2 { + x: mut x1, + y: mut y1, + } = a.into(); + let Vector2 { + x: mut x2, + y: mut y2, + } = b.into(); let Vector2 { x: x3, y: y3 } = c.into(); + // fix winding + if (x2 - x1) * (y3 - y1) - (y2 - y1) * (x3 - x1) > 0.0 { + std::mem::swap(&mut x1, &mut x2); + std::mem::swap(&mut y1, &mut y2); + } let ymin = max(y1.min(y2).min(y3).take() as u32, 0); let ymax = min(y1.max(y2).max(y3).take() as u32, self.height()); let xmin = max(x1.min(x2).min(x3).take() as u32, 0); |