opt: image viewer (#1837)

* opt: image

* opt: MatrixTransition

* update


---------

Co-authored-by: dom <githubaccount56556@proton.me>

lib/utils/extension/num_ext.dart

@@ -21,4 +21,20 @@ extension DoubleExt on double {
     final mod = pow(10, fractionDigits).toDouble();
     return (this * mod).roundToDouble() / mod;
   }
+
+  bool equals(double other, [double epsilon = 1e-10]) =>
+      (this - other).abs() < epsilon;
+
+  double lerp(double a, double b) {
+    assert(
+      a.isFinite,
+      'Cannot interpolate between finite and non-finite values',
+    );
+    assert(
+      b.isFinite,
+      'Cannot interpolate between finite and non-finite values',
+    );
+    assert(isFinite, 't must be finite when interpolating between values');
+    return a * (1.0 - this) + b * this;
+  }
 }