Added path effects to the C# API

binding/Binding/Binding.projitems

@@ -16,6 +16,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)SKColorFilter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)SKPaint.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)SKDocument.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)SKPathEffect.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)SKSurface.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)SKCanvas.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)SKShader.cs" />

binding/Binding/SKPaint.cs

@@ -227,6 +227,15 @@ namespace SkiaSharp
 			}
 		}
 
+		public SKPathEffect PathEffect {
+			get {
+				return GetObject<SKPathEffect> (SkiaApi.sk_paint_get_path_effect(Handle));
+			}
+			set {
+				SkiaApi.sk_paint_set_path_effect (Handle, value == null ? IntPtr.Zero : value.Handle);
+			}
+		}
+
 		public float MeasureText (string text)
 		{
 			if (text == null)

binding/Binding/SKPathEffect.cs

@@ -0,0 +1,84 @@
+//
+// Bindings for SKPath
+//
+// Author:
+//   Matthew Leibowitz
+//
+// Copyright 2016 Xamarin Inc
+//
+using System;
+
+namespace SkiaSharp
+{
+	public enum SkPath1DPathEffectStyle
+	{
+		Translate,
+		Rotate,
+		Morph,
+	}
+
+	public class SKPathEffect : SKObject
+	{
+		[Preserve]
+		internal SKPathEffect (IntPtr handle)
+			: base (handle)
+		{
+		}
+
+		public static SKPathEffect CreateCompose(SKPathEffect outer, SKPathEffect inner)
+		{
+			if (outer == null)
+				throw new ArgumentNullException(nameof(outer));
+			if (inner == null)
+				throw new ArgumentNullException(nameof(inner));
+			return GetObject<SKPathEffect>(SkiaApi.sk_path_effect_create_compose(outer.Handle, inner.Handle));
+		}
+
+		public static SKPathEffect CreateSum(SKPathEffect first, SKPathEffect second)
+		{
+			if (first == null)
+				throw new ArgumentNullException(nameof(first));
+			if (second == null)
+				throw new ArgumentNullException(nameof(second));
+			return GetObject<SKPathEffect>(SkiaApi.sk_path_effect_create_sum(first.Handle, second.Handle));
+		}
+
+		public static SKPathEffect CreateDiscrete(float segLength, float deviation, UInt32 seedAssist = 0)
+		{
+			return GetObject<SKPathEffect>(SkiaApi.sk_path_effect_create_discrete(segLength, deviation, seedAssist));
+		}
+
+		public static SKPathEffect CreateCorner(float radius)
+		{
+			return GetObject<SKPathEffect>(SkiaApi.sk_path_effect_create_corner(radius));
+		}
+
+		public static SKPathEffect Create1DPath(SKPath path, float advance, float phase, SkPath1DPathEffectStyle style)
+		{
+			if (path == null)
+				throw new ArgumentNullException(nameof(path));
+			return GetObject<SKPathEffect>(SkiaApi.sk_path_effect_create_1d_path(path.Handle, advance, phase, style));
+		}
+
+		public static SKPathEffect Create2DLine(float width, SKMatrix matrix)
+		{
+			return GetObject<SKPathEffect>(SkiaApi.sk_path_effect_create_2d_line(width, matrix));
+		}
+
+		public static SKPathEffect Create2DPath(SKMatrix matrix, SKPath path)
+		{
+			if (path == null)
+				throw new ArgumentNullException(nameof(path));
+			return GetObject<SKPathEffect>(SkiaApi.sk_path_effect_create_2d_path(matrix, path.Handle));
+		}
+
+		public static SKPathEffect CreateDash(float[] intervals, float phase)
+		{
+			if (intervals == null)
+				throw new ArgumentNullException(nameof(intervals));
+			return GetObject<SKPathEffect>(SkiaApi.sk_path_effect_create_dash(intervals, intervals.Length, phase));
+		}
+
+	}
+}
+

binding/Binding/SkiaApi.cs

@@ -38,6 +38,7 @@ using sk_imagefilter_t = System.IntPtr;
 using sk_colorfilter_t = System.IntPtr;
 using sk_document_t = System.IntPtr;
 using sk_path_iterator_t = System.IntPtr;
+using sk_path_effect_t = System.IntPtr;
 
 namespace SkiaSharp
 {
@@ -286,6 +287,11 @@ namespace SkiaSharp
 		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
 		public extern static float sk_paint_get_fontmetrics(sk_paint_t t, out SKFontMetrics fontMetrics, float scale);
 
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		public extern static sk_path_effect_t sk_paint_get_path_effect(sk_paint_t cpaint);
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		public extern static void sk_paint_set_path_effect(sk_paint_t cpaint, sk_path_effect_t effect);
+
 
 		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
 		public extern static sk_image_t sk_image_new_raster_copy(ref SKImageInfo info, IntPtr pixels, IntPtr rowBytes);
@@ -851,6 +857,24 @@ namespace SkiaSharp
 		public extern static bool sk_imagedecoder_decode_stream(sk_stream_streamrewindable_t cstream, sk_bitmap_t bitmap, SKColorType pref, SKImageDecoderMode mode, ref SKImageDecoderFormat format);
 		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
 		public extern static int sk_matrix_try_invert(ref SKMatrix matrix, out SKMatrix result);
+
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		public extern static sk_path_effect_t sk_path_effect_create_compose(sk_path_effect_t outer, sk_path_effect_t inner);
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		public extern static sk_path_effect_t sk_path_effect_create_sum(sk_path_effect_t first, sk_path_effect_t second);
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		public extern static sk_path_effect_t sk_path_effect_create_discrete(float segLength, float deviation, UInt32 seedAssist /*0*/);
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		public extern static sk_path_effect_t sk_path_effect_create_corner(float radius);
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		public extern static sk_path_effect_t sk_path_effect_create_1d_path(sk_path_t path, float advance, float phase, SkPath1DPathEffectStyle style);
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		public extern static sk_path_effect_t sk_path_effect_create_2d_line(float width, SKMatrix matrix);
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		public extern static sk_path_effect_t sk_path_effect_create_2d_path(SKMatrix matrix, sk_path_t path);
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		public extern static sk_path_effect_t sk_path_effect_create_dash(float[] intervals, int count, float phase);
+
 	}
 }
 

native-builds/src/SkiaKeeper.c

@@ -31,6 +31,7 @@
 #include "xamarin/sk_x_maskfilter.h"
 #include "xamarin/sk_x_paint.h"
 #include "xamarin/sk_x_path.h"
+#include "xamarin/sk_x_patheffect.h"
 #include "xamarin/sk_x_shader.h"
 #include "xamarin/sk_x_stream.h"
 #include "xamarin/sk_x_typeface.h"
@@ -75,6 +76,7 @@ void** KeepSkiaCSymbols ()
         (void*)sk_string_new_empty,
         (void*)sk_document_unref,
         (void*)sk_wstream_write,
+        (void*)sk_path_effect_create_dash,
 
         // Xamarin
         (void*)sk_managedstream_new,

samples/SharedDemo/SkiaSharp.Demos.cs

@@ -948,6 +948,40 @@ namespace SkiaSharp
 			OpenFileDelegate?.Invoke ("document.pdf");
 		}
 
+		public static void PathEffects (SKCanvas canvas, int width, int height)
+		{
+			canvas.Clear (SKColors.White);
+
+			var step = height / 4;
+
+			using (var paint = new SKPaint ())
+			using (var effect = SKPathEffect.CreateDash (new [] { 15f, 5f }, 0)) {
+				paint.IsStroke = true;
+				paint.StrokeWidth = 4;
+				paint.PathEffect = effect;
+				canvas.DrawLine (10, step, width - 10 - 10, step, paint);
+			}
+
+			using (var paint = new SKPaint ())
+			using (var effect = SKPathEffect.CreateDiscrete (10, 10)) {
+				paint.IsStroke = true;
+				paint.StrokeWidth = 4;
+				paint.PathEffect = effect;
+				canvas.DrawLine (10, step * 2, width - 10 - 10, step * 2, paint);
+			}
+
+			using (var paint = new SKPaint ())
+			using (var dashEffect = SKPathEffect.CreateDash (new [] { 15f, 5f }, 0))
+			using (var discreteEffect = SKPathEffect.CreateDiscrete (10, 10))
+			using (var effect = SKPathEffect.CreateCompose (dashEffect, discreteEffect)) {
+				paint.IsStroke = true;
+				paint.StrokeWidth = 4;
+				paint.PathEffect = effect;
+				canvas.DrawLine (10, step * 3, width - 10 - 10, step * 3, paint);
+			}
+
+		}
+
 
 		[Flags]
 		public enum Platform
@@ -1014,6 +1048,7 @@ namespace SkiaSharp
 			new Sample {Title="Chained Image Filter", Method = ChainedImageFilter, Platform = Platform.All},
 			new Sample {Title="Measure Text Sample", Method = MeasureTextSample, Platform = Platform.All},
 			new Sample {Title="Create PDF", Method = CreatePdfSample, Platform = Platform.All, TapMethod = CreatePdfSampleTapped},
+			new Sample {Title="Path Effects", Method = PathEffects, Platform = Platform.All},
 		};
 	}
 }

skia

@@ -1 +1 @@
-Subproject commit 2e4ace6235c0515c65931e5c08b212f83e3081e4
+Subproject commit e31d35bc32be52f8e2c9da9628c89ca5646ad975