Show ColorFilter

Instead of requiring clients to use ui.ColorFilter, we show show the
ColorFilter class, similar to what we do for Color.

examples/stocks/lib/stock_home.dart

@@ -226,7 +226,7 @@ class StockHomeState extends State<StockHome> {
     return new ToolBar(
       left: new IconButton(
         icon: "navigation/arrow_back",
-        colorFilter: new ui.ColorFilter.mode(Theme.of(context).accentColor, ui.TransferMode.srcATop),
+        colorFilter: new ColorFilter.mode(Theme.of(context).accentColor, ui.TransferMode.srcATop),
         onPressed: _handleSearchEnd
       ),
       center: new Input(

packages/flutter/lib/src/material/drawer_item.dart

@@ -47,10 +47,10 @@ class _DrawerItemState extends State<DrawerItem> {
     return Colors.transparent;
   }
 
-  ui.ColorFilter _getColorFilter(ThemeData themeData) {
+  ColorFilter _getColorFilter(ThemeData themeData) {
     if (config.selected)
-      return new ui.ColorFilter.mode(themeData.primaryColor, TransferMode.srcATop);
-    return new ui.ColorFilter.mode(const Color(0x73000000), TransferMode.dstIn);
+      return new ColorFilter.mode(themeData.primaryColor, TransferMode.srcATop);
+    return new ColorFilter.mode(const Color(0x73000000), TransferMode.dstIn);
   }
 
   Widget build(BuildContext context) {

packages/flutter/lib/src/material/icon.dart

@@ -35,7 +35,7 @@ class Icon extends StatelessComponent {
   final int size;
   final String type;
   final IconThemeColor color;
-  final ui.ColorFilter colorFilter;
+  final ColorFilter colorFilter;
 
   String _getColorSuffix(BuildContext context) {
     IconThemeColor iconThemeColor = color;

packages/flutter/lib/src/material/icon_button.dart

@@ -20,7 +20,7 @@ class IconButton extends StatelessComponent {
 
   final String icon;
   final IconThemeColor color;
-  final ui.ColorFilter colorFilter;
+  final ColorFilter colorFilter;
   final GestureTapCallback onPressed;
 
   Widget build(BuildContext context) {

packages/flutter/lib/src/material/tabs.dart

@@ -321,7 +321,7 @@ class Tab extends StatelessComponent {
   Widget _buildLabelIcon() {
     assert(label.icon != null);
     Color iconColor = selected ? selectedColor : color;
-    ui.ColorFilter filter = new ui.ColorFilter.mode(iconColor, TransferMode.srcATop);
+    ColorFilter filter = new ColorFilter.mode(iconColor, TransferMode.srcATop);
     return new Icon(type: label.icon, size: _kTabIconSize, colorFilter: filter);
   }
 

packages/flutter/lib/src/painting/basic_types.dart

@@ -5,6 +5,7 @@
 export 'dart:ui' show
   Canvas,
   Color,
+  ColorFilter,
   FontStyle,
   FontWeight,
   Offset,

packages/flutter/lib/src/painting/box_painter.dart

@@ -561,10 +561,10 @@ enum ImageRepeat {
 
 /// Paint an image into the given rectangle in the canvas
 void paintImage({
-  ui.Canvas canvas,
+  Canvas canvas,
   Rect rect,
   ui.Image image,
-  ui.ColorFilter colorFilter,
+  ColorFilter colorFilter,
   ImageFit fit,
   repeat: ImageRepeat.noRepeat,
   Rect centerSlice,
@@ -668,7 +668,7 @@ class BackgroundImage {
   final Rect centerSlice;
 
   /// A color filter to apply to the background image before painting it.
-  final ui.ColorFilter colorFilter;
+  final ColorFilter colorFilter;
 
   /// The image to be painted into the background.
   ui.Image get image => _image;

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

@@ -5,6 +5,7 @@
 export 'dart:ui' show
   Canvas,
   Color,
+  ColorFilter,
   Offset,
   Paint,
   Path,

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

@@ -22,7 +22,7 @@ class RenderImage extends RenderBox {
     ui.Image image,
     double width,
     double height,
-    ui.ColorFilter colorFilter,
+    ColorFilter colorFilter,
     ImageFit fit,
     repeat: ImageRepeat.noRepeat,
     Rect centerSlice
@@ -67,9 +67,9 @@ class RenderImage extends RenderBox {
   }
 
   /// If non-null, apply this color filter to the image before painint.
-  ui.ColorFilter get colorFilter => _colorFilter;
-  ui.ColorFilter _colorFilter;
-  void set colorFilter (ui.ColorFilter value) {
+  ColorFilter get colorFilter => _colorFilter;
+  ColorFilter _colorFilter;
+  void set colorFilter (ColorFilter value) {
     if (value == _colorFilter)
       return;
     _colorFilter = value;

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

@@ -20,6 +20,7 @@ export 'package:flutter/rendering.dart' show
     BoxShadow,
     Canvas,
     Color,
+    ColorFilter,
     EdgeDims,
     FlexAlignItems,
     FlexDirection,
@@ -894,7 +895,7 @@ class Image extends LeafRenderObjectWidget {
   final ui.Image image;
   final double width;
   final double height;
-  final ui.ColorFilter colorFilter;
+  final ColorFilter colorFilter;
   final ImageFit fit;
   final ImageRepeat repeat;
   final Rect centerSlice;
@@ -936,7 +937,7 @@ class ImageListener extends StatefulComponent {
   final ImageResource image;
   final double width;
   final double height;
-  final ui.ColorFilter colorFilter;
+  final ColorFilter colorFilter;
   final ImageFit fit;
   final ImageRepeat repeat;
   final Rect centerSlice;
@@ -998,7 +999,7 @@ class NetworkImage extends StatelessComponent {
   final String src;
   final double width;
   final double height;
-  final ui.ColorFilter colorFilter;
+  final ColorFilter colorFilter;
   final ImageFit fit;
   final ImageRepeat repeat;
   final Rect centerSlice;
@@ -1033,7 +1034,7 @@ class AssetImage extends StatelessComponent {
   final AssetBundle bundle;
   final double width;
   final double height;
-  final ui.ColorFilter colorFilter;
+  final ColorFilter colorFilter;
   final ImageFit fit;
   final ImageRepeat repeat;
   final Rect centerSlice;

packages/flutter_sprites/lib/src/sprite.dart

@@ -113,7 +113,7 @@ abstract class SpritePaint {
     paint.color = new Color.fromARGB((255.0*_opacity).toInt(), 255, 255, 255);
 
     if (colorOverlay != null) {
-      paint.colorFilter = new ui.ColorFilter.mode(colorOverlay, ui.TransferMode.srcATop);
+      paint.colorFilter = new ColorFilter.mode(colorOverlay, ui.TransferMode.srcATop);
     }
 
     if (transferMode != null) {