refactor: move custom theme into its separate crate

1 files changed, 61 insertions, 0 deletions

diff --git a/material_theme/src/utils.rs b/material_theme/src/utils.rs
new file mode 100644
index 0000000..c9eb78e
--- /dev/null
+++ b/material_theme/src/utils.rs
@@ -0,0 +1,61 @@
+use iced_widget::core::Color;
+
+pub fn elevation(elevation_level: u8) -> f32 {
+    (match elevation_level {
+        0 => 0.0,
+        1 => 1.0,
+        2 => 3.0,
+        3 => 6.0,
+        4 => 8.0,
+        _ => 12.0,
+    } as f32)
+}
+
+pub fn mix(color1: Color, color2: Color, p2: f32) -> Color {
+    if p2 <= 0.0 {
+        return color1;
+    } else if p2 >= 1.0 {
+        return color2;
+    }
+
+    let p1 = 1.0 - p2;
+
+    if color1.a != 1.0 || color2.a != 1.0 {
+        let a = color1.a * p1 + color2.a * p2;
+        if a > 0.0 {
+            let c1 = color1.into_linear().map(|c| c * color1.a * p1);
+            let c2 = color2.into_linear().map(|c| c * color2.a * p2);
+
+            let [r, g, b] =
+                [c1[0] + c2[0], c1[1] + c2[1], c1[2] + c2[2]].map(|u| u / a);
+
+            return Color::from_linear_rgba(r, g, b, a);
+        }
+    }
+
+    let c1 = color1.into_linear().map(|c| c * p1);
+    let c2 = color2.into_linear().map(|c| c * p2);
+
+    Color::from_linear_rgba(
+        c1[0] + c2[0],
+        c1[1] + c2[1],
+        c1[2] + c2[2],
+        c1[3] + c2[3],
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{Color, mix};
+
+    #[test]
+    fn mixing_works() {
+        let base = Color::from_rgba(1.0, 0.0, 0.0, 0.7);
+        let overlay = Color::from_rgba(0.0, 1.0, 0.0, 0.2);
+
+        assert_eq!(
+            mix(base, overlay, 0.75).into_rgba8(),
+            Color::from_linear_rgba(0.53846, 0.46154, 0.0, 0.325).into_rgba8()
+        );
+    }
+}