Give scale parameter to ImageCache and NetworkImage

packages/flutter/lib/src/rendering/image.dart

@@ -78,7 +78,7 @@ class RenderImage extends RenderBox {
     markNeedsLayout();
   }
 
-  /// If non-null, specify the image's scale.
+  /// Specifies the image's scale.
   ///
   /// Used when determining the best display size for the image.
   double get scale => _scale;

packages/flutter/lib/src/services/asset_bundle.dart

@@ -43,9 +43,9 @@ class NetworkAssetBundle extends AssetBundle {
 
 abstract class CachingAssetBundle extends AssetBundle {
   final Map<String, ImageResource> imageResourceCache =
-    new Map<String, ImageResource>();
+    <String, ImageResource>{};
   final Map<String, Future<String>> _stringCache =
-    new Map<String, Future<String>>();
+    <String, Future<String>>{};
 
   Future<ImageInfo> fetchImage(String key) async {
     return new ImageInfo(image: await decodeImageFromDataPipe(await load(key)));

packages/flutter/lib/src/services/image_cache.dart

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:async';
+import 'dart:ui' show hashValues;
 
 import 'package:mojo/mojo/url_response.mojom.dart';
 import 'package:quiver/collection.dart';
@@ -19,8 +20,9 @@ abstract class ImageProvider {
 
 class _UrlFetcher implements ImageProvider {
   final String _url;
+  final double _scale;
 
-  _UrlFetcher(this._url);
+  _UrlFetcher(this._url, this._scale);
 
   Future<ImageInfo> loadImage() async {
     UrlResponse response = await fetchUrl(_url);
@@ -28,11 +30,17 @@ class _UrlFetcher implements ImageProvider {
       print("Failed (${response.statusCode}) to load image $_url");
       return null;
     }
-    return new ImageInfo(image: await decodeImageFromDataPipe(response.body));
+    return new ImageInfo(
+      image: await decodeImageFromDataPipe(response.body),
+      scale: _scale
+    );
   }
 
-  bool operator ==(other) => other is _UrlFetcher && _url == other._url;
-  int get hashCode => _url.hashCode;
+  bool operator ==(other) {
+    return other is _UrlFetcher && _url == other._url && _scale == other._scale;
+  }
+
+  int get hashCode => hashValues(_url, _scale);
 }
 
 const int _kDefaultSize = 1000;
@@ -52,8 +60,8 @@ class _ImageCache {
     });
   }
 
-  ImageResource load(String url) {
-    return loadProvider(new _UrlFetcher(url));
+  ImageResource load(String url, { double scale: 1.0 }) {
+    return loadProvider(new _UrlFetcher(url, scale));
   }
 }
 

packages/flutter/lib/src/widgets/basic.dart

@@ -1531,7 +1531,7 @@ class RawImage extends LeafRenderObjectWidget {
   /// aspect ratio.
   final double height;
 
-  /// If non-null, specify the image's scale.
+  /// Specifies the image's scale.
   ///
   /// Used when determining the best display size for the image.
   final double scale;
@@ -1700,6 +1700,7 @@ class NetworkImage extends StatelessComponent {
     this.src,
     this.width,
     this.height,
+    this.scale : 1.0,
     this.color,
     this.fit,
     this.alignment,
@@ -1722,6 +1723,11 @@ class NetworkImage extends StatelessComponent {
   /// aspect ratio.
   final double height;
 
+  /// Specifies the image's scale.
+  ///
+  /// Used when determining the best display size for the image.
+  final double scale;
+
   /// If non-null, apply this color filter to the image before painting.
   final Color color;
 
@@ -1749,7 +1755,7 @@ class NetworkImage extends StatelessComponent {
 
   Widget build(BuildContext context) {
     return new RawImageResource(
-      image: imageCache.load(src),
+      image: imageCache.load(src, scale: scale),
       width: width,
       height: height,
       color: color,