Move util::vec::byte_swap to canvas_traits

1 files changed, 13 insertions, 0 deletions

diff --git a/components/canvas_traits/lib.rs b/components/canvas_traits/lib.rs
index 98eaa159077..db945750a0c 100644
--- a/components/canvas_traits/lib.rs
+++ b/components/canvas_traits/lib.rs
@@ -539,3 +539,16 @@ impl ToAzColor for RGBA {
                     self.alpha as AzFloat)
     }
 }
+
+// TODO(pcwalton): Speed up with SIMD, or better yet, find some way to not do this.
+pub fn byte_swap(data: &mut [u8]) {
+    let length = data.len();
+    // FIXME(rust #27741): Range::step_by is not stable yet as of this writing.
+    let mut i = 0;
+    while i < length {
+        let r = data[i + 2];
+        data[i + 2] = data[i + 0];
+        data[i + 0] = r;
+        i += 4;
+    }
+}