Rename TransferMode to BlendMode (#7357)

Skia calls this BlendMode now and that's a better name.

Fixes #7200

bin/internal/engine.version

-ed5a1d2d37e203ec2abce01c7af9ce5fdbdb49a1
+f13518d7e75d30cab494339060c2dfd3121d291b

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

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 export 'dart:ui' show
+  BlendMode,
   BlurStyle,
   Canvas,
   Color,
@@ -30,7 +31,6 @@ export 'dart:ui' show
   TextDecorationStyle,
   TextDirection,
   TileMode,
-  TransferMode,
   VertexMode,
   VoidCallback,
   hashValues,

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

@@ -306,7 +306,7 @@ class _FlutterLogoPainter extends BoxPainter {
     );
     final Paint trianglePaint = new Paint()
       ..shader = triangleGradient
-      ..transferMode = TransferMode.multiply;
+      ..blendMode = BlendMode.multiply;
 
     final ui.Gradient rectangleGradient = new ui.Gradient.linear(
       const <Point>[
@@ -328,7 +328,7 @@ class _FlutterLogoPainter extends BoxPainter {
     );
     final Paint rectanglePaint = new Paint()
       ..shader = rectangleGradient
-      ..transferMode = TransferMode.multiply;
+      ..blendMode = BlendMode.multiply;
 
     // Draw the basic shape.
     final Path topBeam = new Path()
@@ -432,7 +432,7 @@ class _FlutterLogoPainter extends BoxPainter {
         new Paint()
           ..colorFilter = new ColorFilter.mode(
             const Color(0xFFFFFFFF).withOpacity(_config._opacity),
-            TransferMode.modulate,
+            BlendMode.modulate,
           )
       );
     }
@@ -481,7 +481,7 @@ class _FlutterLogoPainter extends BoxPainter {
         _textPainter.paint(canvas, Offset.zero);
         if (_config._position > -1.0) {
           canvas.drawRect(_textBoundingRect.inflate(_textBoundingRect.width * 0.5), new Paint()
-            ..transferMode = TransferMode.modulate
+            ..blendMode = BlendMode.modulate
             ..shader = new ui.Gradient.linear(
               <Point>[new Point(_textBoundingRect.width * -0.5, 0.0), new Point(_textBoundingRect.width * 1.5, 0.0)],
               <Color>[const Color(0xFFFFFFFF), const Color(0xFFFFFFFF), const Color(0x00FFFFFF), const Color(0x00FFFFFF)],

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

@@ -95,12 +95,12 @@ class RenderImage extends RenderBox {
 
   ColorFilter _colorFilter;
 
-  // Should we make the transfer mode configurable?
+  // Should we make the blend mode configurable?
   void _updateColorFilter() {
     if (_color == null)
       _colorFilter = null;
     else
-      _colorFilter = new ColorFilter.mode(_color, TransferMode.srcIn);
+      _colorFilter = new ColorFilter.mode(_color, BlendMode.srcIn);
   }
 
   /// If non-null, apply this color filter to the image before painting.

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

@@ -470,9 +470,9 @@ class OpacityLayer extends ContainerLayer {
 class ShaderMaskLayer extends ContainerLayer {
   /// Creates a shader mask layer.
   ///
-  /// The [shader], [maskRect], and [transferMode] properties must be non-null
+  /// The [shader], [maskRect], and [blendMode] properties must be non-null
   /// before the compositing phase of the pipeline.
-  ShaderMaskLayer({ this.shader, this.maskRect, this.transferMode });
+  ShaderMaskLayer({ this.shader, this.maskRect, this.blendMode });
 
   /// The shader to apply to the children.
   Shader shader;
@@ -480,12 +480,12 @@ class ShaderMaskLayer extends ContainerLayer {
   /// The size of the shader.
   Rect maskRect;
 
-  /// The tranfer mode to apply when blending the shader with the children.
-  TransferMode transferMode;
+  /// The blend mode to apply when blending the shader with the children.
+  BlendMode blendMode;
 
   @override
   void addToScene(ui.SceneBuilder builder, Offset layerOffset) {
-    builder.pushShaderMask(shader, maskRect.shift(layerOffset), transferMode);
+    builder.pushShaderMask(shader, maskRect.shift(layerOffset), blendMode);
     addChildrenToScene(builder, layerOffset);
     builder.pop();
   }
@@ -495,7 +495,7 @@ class ShaderMaskLayer extends ContainerLayer {
     super.debugFillDescription(description);
     description.add('shader: $shader');
     description.add('maskRect: $maskRect');
-    description.add('transferMode: $transferMode');
+    description.add('blendMode: $blendMode');
   }
 }
 

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

@@ -390,7 +390,7 @@ class PaintingContext {
   ///   in the coordinate system of the caller.
   /// * `maskRect` is the region of the canvas (in the coodinate system of the
   ///   caller) in which to apply the mask.
-  /// * `transferMode` is the [TransferMode] to use when applying the shader to
+  /// * `blendMode` is the [BlendMode] to use when applying the shader to
   ///   the painting done by `painter`.
   /// * `painter` is a callback that will paint with the mask applied. This
   ///   function calls the `painter` synchronously.
@@ -399,12 +399,12 @@ class PaintingContext {
   /// [RenderObject.alwaysNeedsCompositing] property to return true. That informs
   /// ancestor render objects that this render object will include a composited
   /// layer, which causes them to use composited clips, for example.
-  void pushShaderMask(Offset offset, Shader shader, Rect maskRect, TransferMode transferMode, PaintingContextCallback painter) {
+  void pushShaderMask(Offset offset, Shader shader, Rect maskRect, BlendMode blendMode, PaintingContextCallback painter) {
     _stopRecordingIfNeeded();
     final ShaderMaskLayer shaderLayer = new ShaderMaskLayer(
       shader: shader,
       maskRect: maskRect,
-      transferMode: transferMode
+      blendMode: blendMode,
     );
     _appendLayer(shaderLayer);
     final PaintingContext childContext = new PaintingContext._(shaderLayer, _paintBounds);

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

@@ -237,7 +237,7 @@ class RenderParagraph extends RenderBox {
       if (_overflowShader != null) {
         canvas.translate(offset.dx, offset.dy);
         Paint paint = new Paint()
-          ..transferMode = TransferMode.modulate
+          ..blendMode = BlendMode.modulate
           ..shader = _overflowShader;
         canvas.drawRect(Point.origin & size, paint);
       }

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

@@ -774,14 +774,14 @@ typedef Shader ShaderCallback(Rect bounds);
 class RenderShaderMask extends RenderProxyBox {
   /// Creates a render object that applies a mask generated by a [Shader] to its child.
   ///
-  /// The [shaderCallback] and [transferMode] arguments must not be null.
+  /// The [shaderCallback] and [blendMode] arguments must not be null.
   RenderShaderMask({
     ShaderCallback shaderCallback,
-    TransferMode transferMode: TransferMode.modulate,
+    BlendMode blendMode: BlendMode.modulate,
     RenderBox child
-  }) : _shaderCallback = shaderCallback, _transferMode = transferMode, super(child) {
+  }) : _shaderCallback = shaderCallback, _blendMode = blendMode, super(child) {
     assert(shaderCallback != null);
-    assert(transferMode != null);
+    assert(blendMode != null);
   }
 
   /// Called to creates the [Shader] that generates the mask.
@@ -800,17 +800,17 @@ class RenderShaderMask extends RenderProxyBox {
     markNeedsPaint();
   }
 
-  /// The [TransferMode] to use when applying the shader to the child.
+  /// The [BlendMode] to use when applying the shader to the child.
   ///
-  /// The default, [TransferMode.modulate], is useful for applying an alpha blend
-  /// to the child. Other transfer modes can be used to create other effects.
-  TransferMode get transferMode => _transferMode;
-  TransferMode _transferMode;
-  set transferMode (TransferMode newTransferMode) {
-    assert(newTransferMode != null);
-    if (_transferMode == newTransferMode)
+  /// The default, [BlendMode.modulate], is useful for applying an alpha blend
+  /// to the child. Other blend modes can be used to create other effects.
+  BlendMode get blendMode => _blendMode;
+  BlendMode _blendMode;
+  set blendMode (BlendMode newBlendMode) {
+    assert(newBlendMode != null);
+    if (_blendMode == newBlendMode)
       return;
-    _transferMode = newTransferMode;
+    _blendMode = newBlendMode;
     markNeedsPaint();
   }
 
@@ -822,7 +822,7 @@ class RenderShaderMask extends RenderProxyBox {
     if (child != null) {
       assert(needsCompositing);
       Rect rect = Point.origin & size;
-      context.pushShaderMask(offset, _shaderCallback(rect), rect, _transferMode, super.paint);
+      context.pushShaderMask(offset, _shaderCallback(rect), rect, _blendMode, super.paint);
     }
   }
 }

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

@@ -112,15 +112,15 @@ class Opacity extends SingleChildRenderObjectWidget {
 class ShaderMask extends SingleChildRenderObjectWidget {
   /// Creates a widget that applies a mask generated by a [Shader] to its child.
   ///
-  /// The [shaderCallback] and [transferMode] arguments must not be null.
+  /// The [shaderCallback] and [blendMode] arguments must not be null.
   ShaderMask({
     Key key,
     @required this.shaderCallback,
-    this.transferMode: TransferMode.modulate,
+    this.blendMode: BlendMode.modulate,
     Widget child
   }) : super(key: key, child: child) {
     assert(shaderCallback != null);
-    assert(transferMode != null);
+    assert(blendMode != null);
   }
 
   /// Called to creates the [Shader] that generates the mask.
@@ -129,17 +129,17 @@ class ShaderMask extends SingleChildRenderObjectWidget {
   /// it can customize the shader to the size and location of the child.
   final ShaderCallback shaderCallback;
 
-  /// The [TransferMode] to use when applying the shader to the child.
+  /// The [BlendMode] to use when applying the shader to the child.
   ///
-  /// The default, [TransferMode.modulate], is useful for applying an alpha blend
-  /// to the child. Other transfer modes can be used to create other effects.
-  final TransferMode transferMode;
+  /// The default, [BlendMode.modulate], is useful for applying an alpha blend
+  /// to the child. Other blend modes can be used to create other effects.
+  final BlendMode blendMode;
 
   @override
   RenderShaderMask createRenderObject(BuildContext context) {
     return new RenderShaderMask(
       shaderCallback: shaderCallback,
-      transferMode: transferMode
+      blendMode: blendMode
     );
   }
 
@@ -147,7 +147,7 @@ class ShaderMask extends SingleChildRenderObjectWidget {
   void updateRenderObject(BuildContext context, RenderShaderMask renderObject) {
     renderObject
       ..shaderCallback = shaderCallback
-      ..transferMode = transferMode;
+      ..blendMode = blendMode;
   }
 }