Add SKShader binding to create Improved Perlin noise (#1056)

binding/Binding/SKShader.cs

@@ -211,6 +211,11 @@ namespace SkiaSharp
 		{
 			return GetObject<SKShader>(SkiaApi.sk_shader_new_perlin_noise_fractal_noise(baseFrequencyX, baseFrequencyY, numOctaves, seed, null));
 		}
+		
+		public static SKShader CreatePerlinNoiseImprovedNoise(float baseFrequencyX, float baseFrequencyY, int numOctaves, float z)
+		{
+			return GetObject<SKShader>(SkiaApi.sk_shader_new_perlin_noise_improved_noise(baseFrequencyX, baseFrequencyY, numOctaves, z));
+		}
 
 		public static SKShader CreatePerlinNoiseFractalNoise(float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed, SKPointI tileSize)
 		{

binding/Binding/SkiaApi.generated.cs

@@ -3199,6 +3199,10 @@ namespace SkiaSharp
 		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
 		internal static extern sk_shader_t sk_shader_new_perlin_noise_fractal_noise (Single baseFrequencyX, Single baseFrequencyY, Int32 numOctaves, Single seed, SKSizeI* tileSize);
 
+		// sk_shader_t* sk_shader_new_perlin_noise_improved_noise(float baseFrequencyX, float baseFrequencyY, int numOctaves, float z)
+		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
+		internal static extern sk_shader_t sk_shader_new_perlin_noise_improved_noise (Single baseFrequencyX, Single baseFrequencyY, Int32 numOctaves, Single z);
+
 		// sk_shader_t* sk_shader_new_perlin_noise_turbulence(float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed, const sk_isize_t* tileSize)
 		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
 		internal static extern sk_shader_t sk_shader_new_perlin_noise_turbulence (Single baseFrequencyX, Single baseFrequencyY, Int32 numOctaves, Single seed, SKSizeI* tileSize);

externals/skia

@@ -1 +1 @@
-Subproject commit b4b86b6eb8e8e5d397e969ef8b8b7ab59cad333f
+Subproject commit 5029445713c6f0612eb30bace90b0cfce2307060

scripts/azure-pipelines.yml

@@ -15,7 +15,7 @@ variables:
   MANAGED_LINUX_PACKAGES: ttf-ancient-fonts
   MONO_VERSION_MACOS: 6_4_0
   MONO_VERSION_LINUX: stable-xenial/snapshots/6.4.0
-  XCODE_VERSION: 11
+  XCODE_VERSION: 11.3
   DOTNET_VERSION: 3.0.x
   CONFIGURATION: 'Release'
   VM_IMAGE_WINDOWS_NATIVE: Hosted VS2017