refactor: split cargo workspace

crates/units/src/scale.rs

@@ -0,0 +1,72 @@
+use std::fmt::{Debug, Display, Formatter};
+
+pub const SCALE_BASE: u32 = 120;
+const BASE64: i64 = SCALE_BASE as i64;
+pub const SCALE_BASEF: f64 = SCALE_BASE as f64;
+
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+#[repr(transparent)]
+pub struct Scale(u32);
+
+impl Default for Scale {
+    fn default() -> Self {
+        Scale::from_int(1)
+    }
+}
+
+impl Scale {
+    pub const fn from_int(f: u32) -> Self {
+        Self(f.saturating_mul(SCALE_BASE))
+    }
+
+    pub fn from_f64(f: f64) -> Self {
+        Self((f * SCALE_BASEF).round() as u32)
+    }
+
+    pub fn from_f64_as_float(f: f64) -> Self {
+        Self(((f * (SCALE_BASEF / 15.0)).round() as u32).saturating_mul(15))
+    }
+
+    pub fn to_f64(self) -> f64 {
+        self.0 as f64 / SCALE_BASEF
+    }
+
+    pub fn round_up(self) -> u32 {
+        self.0.saturating_add(SCALE_BASE - 1) / SCALE_BASE
+    }
+
+    pub const fn from_wl(wl: u32) -> Self {
+        Self(wl)
+    }
+
+    pub fn to_wl(self) -> u32 {
+        self.0
+    }
+
+    #[inline(always)]
+    pub fn pixel_size<const N: usize>(self, v: [i32; N]) -> [i32; N] {
+        if self == Scale::default() {
+            return v;
+        }
+        let scale = self.0 as i64;
+        v.map(|v| ((v as i64 * scale + v.signum() as i64 * BASE64 / 2) / BASE64) as i32)
+    }
+}
+
+impl PartialEq<u32> for Scale {
+    fn eq(&self, other: &u32) -> bool {
+        self.0 == other * SCALE_BASE
+    }
+}
+
+impl Debug for Scale {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        Debug::fmt(&self.to_f64(), f)
+    }
+}
+
+impl Display for Scale {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        Display::fmt(&self.to_f64(), f)
+    }
+}