Remove usage of unstable feature iterator_step_by

components/net/image_cache.rs

@@ -109,7 +109,8 @@ fn is_image_opaque(format: webrender_api::ImageFormat, bytes: &[u8]) -> bool {
 fn premultiply(data: &mut [u8]) {
     let length = data.len();
 
-    for i in Iterator::step_by(0..length, 4) {
+    let mut i = 0;
+    while i < length {
         let b = data[i + 0] as u32;
         let g = data[i + 1] as u32;
         let r = data[i + 2] as u32;
@@ -118,6 +119,8 @@ fn premultiply(data: &mut [u8]) {
         data[i + 0] = (b * a / 255) as u8;
         data[i + 1] = (g * a / 255) as u8;
         data[i + 2] = (r * a / 255) as u8;
+
+        i += 4;
     }
 }
 

components/net/lib.rs

@@ -4,7 +4,6 @@
 
 #![deny(unsafe_code)]
 #![feature(box_syntax)]
-#![feature(iterator_step_by)]
 
 extern crate base64;
 extern crate brotli;

components/net_traits/image/base.rs

@@ -50,7 +50,8 @@ pub struct ImageMetadata {
 fn byte_swap_and_premultiply(data: &mut [u8]) {
     let length = data.len();
 
-    for i in Iterator::step_by(0..length, 4) {
+    let mut i = 0;
+    while i < length {
         let r = data[i + 2];
         let g = data[i + 1];
         let b = data[i + 0];
@@ -58,6 +59,8 @@ fn byte_swap_and_premultiply(data: &mut [u8]) {
         data[i + 0] = r;
         data[i + 1] = g;
         data[i + 2] = b;
+
+        i += 4;
     }
 }
 

components/net_traits/lib.rs

@@ -3,7 +3,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #![feature(box_syntax)]
-#![feature(iterator_step_by)]
 
 #![deny(unsafe_code)]