Replace usages of legacy numeric constants. (#103)

The associated constants on the types are preferred as the legacy
items may be deprecated in the future.

See https://rust-lang.github.io/rust-clippy/master/index.html#legacy_numeric_constants
for more details.

rasterizer/src/geometry.rs

@@ -54,8 +54,8 @@ impl core::ops::Sub for Point {
     /// # use ab_glyph_rasterizer::*;
     /// let p1 = point(1.0, 2.0) - point(2.0, 1.5);
     ///
-    /// assert!((p1.x - -1.0).abs() <= core::f32::EPSILON);
-    /// assert!((p1.y - 0.5).abs() <= core::f32::EPSILON);
+    /// assert!((p1.x - -1.0).abs() <= f32::EPSILON);
+    /// assert!((p1.y - 0.5).abs() <= f32::EPSILON);
     /// ```
     #[inline]
     fn sub(self, rhs: Point) -> Point {
@@ -71,8 +71,8 @@ impl core::ops::Add for Point {
     /// # use ab_glyph_rasterizer::*;
     /// let p1 = point(1.0, 2.0) + point(2.0, 1.5);
     ///
-    /// assert!((p1.x - 3.0).abs() <= core::f32::EPSILON);
-    /// assert!((p1.y - 3.5).abs() <= core::f32::EPSILON);
+    /// assert!((p1.x - 3.0).abs() <= f32::EPSILON);
+    /// assert!((p1.y - 3.5).abs() <= f32::EPSILON);
     /// ```
     #[inline]
     fn add(self, rhs: Point) -> Point {
@@ -86,8 +86,8 @@ impl core::ops::AddAssign for Point {
     /// let mut p1 = point(1.0, 2.0);
     /// p1 += point(2.0, 1.5);
     ///
-    /// assert!((p1.x - 3.0).abs() <= core::f32::EPSILON);
-    /// assert!((p1.y - 3.5).abs() <= core::f32::EPSILON);
+    /// assert!((p1.x - 3.0).abs() <= f32::EPSILON);
+    /// assert!((p1.y - 3.5).abs() <= f32::EPSILON);
     /// ```
     #[inline]
     fn add_assign(&mut self, other: Self) {
@@ -102,8 +102,8 @@ impl core::ops::SubAssign for Point {
     /// let mut p1 = point(1.0, 2.0);
     /// p1 -= point(2.0, 1.5);
     ///
-    /// assert!((p1.x - -1.0).abs() <= core::f32::EPSILON);
-    /// assert!((p1.y - 0.5).abs() <= core::f32::EPSILON);
+    /// assert!((p1.x - -1.0).abs() <= f32::EPSILON);
+    /// assert!((p1.y - 0.5).abs() <= f32::EPSILON);
     /// ```
     #[inline]
     fn sub_assign(&mut self, other: Self) {
@@ -143,6 +143,6 @@ mod test {
     #[test]
     fn distance_to() {
         let distance = point(0.0, 0.0).distance_to(point(3.0, 4.0));
-        assert!((distance - 5.0).abs() <= core::f32::EPSILON);
+        assert!((distance - 5.0).abs() <= f32::EPSILON);
     }
 }

rasterizer/src/raster.rs

@@ -104,7 +104,7 @@ impl Rasterizer {
 
     #[inline(always)] // must inline for simd versions
     fn draw_line_scalar(&mut self, p0: Point, p1: Point) {
-        if (p0.y - p1.y).abs() <= core::f32::EPSILON {
+        if (p0.y - p1.y).abs() <= f32::EPSILON {
             return;
         }
         let (dir, p0, p1) = if p0.y < p1.y {