skia_safe/core/
rsxform.rs

1use crate::{prelude::*, scalar, Point, Size, Vector};
2use skia_bindings::SkRSXform;
3
4#[derive(Copy, Clone, PartialEq, Debug)]
5#[repr(C)]
6pub struct RSXform {
7    pub scos: scalar,
8    pub ssin: scalar,
9    // don't use Vector here to keep this struct Skia-like.
10    pub tx: scalar,
11    pub ty: scalar,
12}
13
14native_transmutable!(SkRSXform, RSXform, rsxform_layout);
15
16impl RSXform {
17    pub fn new(scos: scalar, ssin: scalar, t: impl Into<Vector>) -> Self {
18        let t = t.into();
19        Self {
20            scos,
21            ssin,
22            tx: t.x,
23            ty: t.y,
24        }
25    }
26
27    pub fn from_radians(
28        scale: scalar,
29        radians: scalar,
30        t: impl Into<Vector>,
31        a: impl Into<Point>,
32    ) -> Self {
33        let t = t.into();
34        let a = a.into();
35
36        let s = radians.sin() * scale;
37        let c = radians.cos() * scale;
38        Self::new(c, s, (t.x + -c * a.x + s * a.y, t.y + -s * a.x - c * a.y))
39    }
40
41    pub fn rect_stays_rect(&self) -> bool {
42        self.scos == 0.0 || self.ssin == 0.0
43    }
44
45    pub fn set_identity(&mut self) {
46        self.set(1.0, 0.0, Vector::default())
47    }
48
49    pub fn set(&mut self, scos: scalar, ssin: scalar, t: impl Into<Vector>) {
50        let t = t.into();
51        self.scos = scos;
52        self.ssin = ssin;
53        self.tx = t.x;
54        self.ty = t.y;
55    }
56
57    pub fn to_quad(self, size: impl Into<Size>) -> [Point; 4] {
58        let size = size.into();
59        let mut quad: [Point; 4] = Default::default();
60        unsafe {
61            self.native()
62                .toQuad(size.width, size.height, quad.native_mut().as_mut_ptr())
63        }
64        quad
65    }
66
67    pub fn to_tri_strip(self, size: impl Into<Size>) -> [Point; 4] {
68        let size = size.into();
69        let mut strip: [Point; 4] = Default::default();
70        unsafe {
71            self.native()
72                .toTriStrip(size.width, size.height, strip.native_mut().as_mut_ptr())
73        }
74        strip
75    }
76}
skia_safe/core/rsxform.rs

skia_safe/core/
rsxform.rs
