fast image operations
Diffstat (limited to 'src/drawing/tri.rs')
| -rw-r--r-- | src/drawing/tri.rs | 45 |
1 files changed, 0 insertions, 45 deletions
diff --git a/src/drawing/tri.rs b/src/drawing/tri.rs deleted file mode 100644 index 3cc390b..0000000 --- a/src/drawing/tri.rs +++ /dev/null @@ -1,45 +0,0 @@ -//! trongle drawing -use crate::Image; - -impl<const CHANNELS: usize> Image<&mut [u8], CHANNELS> { - /// Draw a (filled) triangle - /// - /// # Safety - /// - /// UB if any point is out of bounds - /// ``` - /// # use fimg::*; - /// let mut a = Image::alloc(10, 10); - /// // draw a triangle from point a v point b v point c v - /// // with color white - /// unsafe { a.as_mut().tri((3.0, 2.0), (8.0, 7.0), (1.0, 8.0), [255]) }; - /// # assert_eq!(a.buffer(), b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"); - /// ``` - pub unsafe fn tri( - &mut self, - (x1, y1): (f32, f32), - (x2, y2): (f32, f32), - (x3, y3): (f32, f32), - c: [u8; CHANNELS], - ) { - // TODO optimize - for y in y1.min(y2).min(y3) as u32..y1.max(y2).max(y3) as u32 { - for x in x1.min(x2).min(x3) as u32..x1.max(x2).max(x3) as u32 { - let s = (x1 - x3) * (y as f32 - y3) - (y1 - y2) * (x as f32 - x3); - let t = (x2 - x1) * (y as f32 - y1) - (y2 - y1) * (x as f32 - x1); - - if (s < 0.0) != (t < 0.0) && s != 0.0 && t != 0.0 { - continue; - } - - let d = (x3 - x2) * (y as f32 - y2) - (y3 - y2) * (x as f32 - x2); - if d == 0.0 || (d < 0.0) == (s + t <= 0.0) { - // SAFETY: - // caller gurantees triangle is in bounds, this loops over the - // bounding box of the triangle, therefore this is fine. - unsafe { self.set_pixel(x, y, c) }; - } - } - } - } -} |