Bug 1535273 - Remove webrender::util::rect_is_empty. r=kats

gfx/wr/webrender/src/texture_allocator.rs

@@ -3,7 +3,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use api::units::{DeviceIntPoint, DeviceIntRect, DeviceIntSize};
-use util;
 
 //TODO: gather real-world statistics on the bin usage in order to assist the decision
 // on where to place the size thresholds.
@@ -167,10 +166,10 @@ impl ArrayAllocationTracker {
         }
 
         // Add the guillotined rects back to the free list.
-        if !util::rect_is_empty(&new_free_rect_to_right) {
+        if !new_free_rect_to_right.is_empty() {
             self.push(chosen.slice, new_free_rect_to_right);
         }
-        if !util::rect_is_empty(&new_free_rect_to_bottom) {
+        if !new_free_rect_to_bottom.is_empty() {
             self.push(chosen.slice, new_free_rect_to_bottom);
         }
     }

gfx/wr/webrender/src/util.rs

@@ -7,7 +7,6 @@ use api::units::*;
 use euclid::{Point2D, Rect, Size2D, TypedPoint2D, TypedRect, TypedSize2D, Vector2D};
 use euclid::{TypedTransform2D, TypedTransform3D, TypedVector2D, TypedScale};
 use malloc_size_of::{MallocShallowSizeOf, MallocSizeOf, MallocSizeOfOps};
-use num_traits::Zero;
 use plane_split::{Clipper, Polygon};
 use std::{i32, f32, fmt, ptr};
 use std::borrow::Cow;
@@ -416,12 +415,6 @@ impl<U> RectHelpers<U> for TypedRect<f32, U> {
     }
 }
 
-// Don't use `euclid`'s `is_empty` because that has effectively has an "and" in the conditional
-// below instead of an "or".
-pub fn rect_is_empty<N: PartialEq + Zero, U>(rect: &TypedRect<N, U>) -> bool {
-    rect.size.width == Zero::zero() || rect.size.height == Zero::zero()
-}
-
 #[allow(dead_code)]
 #[inline]
 pub fn rect_from_points_f(x0: f32, y0: f32, x1: f32, y1: f32) -> Rect<f32> {