Added the C# API for SkBitmapScaler::Resize

binding/Binding/Definitions.cs

@@ -635,6 +635,14 @@ namespace SkiaSharp
 		BgrVertical
 	}
 
+	public enum SKBitmapResizeMethod {
+		Box,
+		Triangle,
+		Lanczos3,
+		Hamming,
+		Mitchell
+	}
+
 	[Flags]
 	public enum SKSurfacePropsFlags {
 		UseDeviceIndependentFonts = 1 << 0,

binding/Binding/SKBitmap.cs

@@ -477,6 +477,31 @@ namespace SkiaSharp
 			}
 		}
 
+		public SKBitmap Resize (SKImageInfo info, SKBitmapResizeMethod method)
+		{
+			var dst = new SKBitmap (info);
+			var result = Resize (dst, this, method);
+			if (result) {
+				return dst;
+			} else {
+				dst.Dispose ();
+				return null;
+			}
+		}
+
+		public bool Resize (SKBitmap dst, SKBitmapResizeMethod method)
+		{
+			return Resize (dst, this, method);
+		}
+
+		public static bool Resize (SKBitmap dst, SKBitmap src, SKBitmapResizeMethod method)
+		{
+			using (var srcPix = src.PeekPixels ())
+			using (var dstPix = dst.PeekPixels ()) {
+				return SKPixmap.Resize (dstPix, srcPix, method);// && dst.InstallPixels (dstPix); 
+			}
+		}
+
 		// internal proxy
 		#if __IOS__
 		[ObjCRuntime.MonoPInvokeCallback (typeof (SKBitmapReleaseDelegateInternal))]

binding/Binding/SKPixmap.cs

@@ -98,5 +98,10 @@ namespace SkiaSharp
 		public SKColorTable ColorTable {
 			get { return GetObject<SKColorTable> (SkiaApi.sk_pixmap_get_colortable (Handle)); }
 		}
+
+		public static bool Resize (SKPixmap dst, SKPixmap src, SKBitmapResizeMethod method)
+		{
+			return SkiaApi.sk_bitmapscaler_resize (dst.Handle, src.Handle, method);
+		}
 	}
 }

binding/Binding/SkiaApi.cs

@@ -1144,6 +1144,9 @@ namespace SkiaSharp
 		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
 		[return: MarshalAs(UnmanagedType.I1)]
 		public extern static bool sk_bitmap_peek_pixels(sk_bitmap_t cbitmap, sk_pixmap_t cpixmap);
+		[DllImport(SKIA, CallingConvention = CallingConvention.Cdecl)]
+		[return: MarshalAs(UnmanagedType.I1)]
+		public extern static bool sk_bitmapscaler_resize(sk_pixmap_t cdst, sk_pixmap_t csrc, SKBitmapResizeMethod method);
 
 		// SkPixmap
 

externals/skia

@@ -1 +1 @@
-Subproject commit eeb1435233f45a2cdb053c522fd26fb1e5355a89
+Subproject commit 4b0bfe18dad276200bdd2ff43fc084da38e76d02

tests/Tests/SKBitmapTest.cs

@@ -59,5 +59,29 @@ namespace SkiaSharp.Tests
 				Assert.AreEqual(bitmap.GetPixels(), pixmap.GetPixels());
 			}
 		}
+
+		[Test]
+		public void BitmapResizes()
+		{
+			var srcInfo = new SKImageInfo(200, 200);
+			var dstInfo = new SKImageInfo(100, 100);
+
+			var srcBmp = new SKBitmap(srcInfo);
+
+			using (var canvas = new SKCanvas(srcBmp))
+			using (var paint = new SKPaint { Color = SKColors.Green }) {
+				canvas.Clear(SKColors.Blue);
+				canvas.DrawRect(new SKRect(0, 0, 100, 200), paint);
+			}
+
+			Assert.AreEqual(SKColors.Green, srcBmp.GetPixel(75, 75));
+			Assert.AreEqual(SKColors.Blue, srcBmp.GetPixel(175, 175));
+
+			var dstBmp = srcBmp.Resize(dstInfo, SKBitmapResizeMethod.Mitchell);
+			Assert.IsNotNull(dstBmp);
+
+			Assert.AreEqual(SKColors.Green, dstBmp.GetPixel(25, 25));
+			Assert.AreEqual(SKColors.Blue, dstBmp.GetPixel(75, 75));
+		}
 	}
 }