♻️ Refactor custom matrix code into submodule

render-wasm/src/shapes/matrix.rs

@@ -0,0 +1,61 @@
+use skia_safe as skia;
+
+#[derive(Debug, Clone, Copy)]
+pub struct Matrix {
+    pub a: f32,
+    pub b: f32,
+    pub c: f32,
+    pub d: f32,
+    pub e: f32,
+    pub f: f32,
+}
+
+impl Matrix {
+    pub fn new(a: f32, b: f32, c: f32, d: f32, e: f32, f: f32) -> Self {
+        Self { a, b, c, d, e, f }
+    }
+
+    pub fn identity() -> Self {
+        Self {
+            a: 1.,
+            b: 0.,
+            c: 0.,
+            d: 1.,
+            e: 0.,
+            f: 0.,
+        }
+    }
+
+    pub fn to_skia_matrix(&self) -> skia::Matrix {
+        let mut res = skia::Matrix::new_identity();
+
+        let (translate_x, translate_y) = self.translation();
+        let (scale_x, scale_y) = self.scale();
+        let (skew_x, skew_y) = self.skew();
+        res.set_all(
+            scale_x,
+            skew_x,
+            translate_x,
+            skew_y,
+            scale_y,
+            translate_y,
+            0.,
+            0.,
+            1.,
+        );
+
+        res
+    }
+
+    fn translation(&self) -> (f32, f32) {
+        (self.e, self.f)
+    }
+
+    fn scale(&self) -> (f32, f32) {
+        (self.a, self.d)
+    }
+
+    fn skew(&self) -> (f32, f32) {
+        (self.c, self.b)
+    }
+}

render-wasm/src/shapes/renderable.rs

@@ -7,21 +7,7 @@ use crate::render::{ImageStore, Renderable};
 
 impl Renderable for Shape {
     fn render(&self, surface: &mut skia_safe::Surface, images: &ImageStore) -> Result<(), String> {
-        let mut transform = skia::Matrix::new_identity();
-        let (translate_x, translate_y) = self.translation();
-        let (scale_x, scale_y) = self.scale();
-        let (skew_x, skew_y) = self.skew();
-        transform.set_all(
-            scale_x,
-            skew_x,
-            translate_x,
-            skew_y,
-            scale_y,
-            translate_y,
-            0.,
-            0.,
-            1.,
-        );
+        let transform = self.transform.to_skia_matrix();
 
         // Check transform-matrix code from common/src/app/common/geom/shapes/transforms.cljc
         let center = self.selrect.center();