feat: add FeGaussianBlur filter

USAGE.md

@@ -1260,6 +1260,7 @@ Filter effects are a way of processing an element’s rendering before it is dis
 Currently supported\* filters are:
 
 - FeColorMatrix
+- FeGaussianBlur
 
 \*_More filters are coming soon_
 

android/src/main/java/com/horcrux/svg/FeGaussianBlurView.java

@@ -0,0 +1,75 @@
+package com.horcrux.svg;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.renderscript.Allocation;
+import android.renderscript.Element;
+import android.renderscript.RenderScript;
+import android.renderscript.ScriptIntrinsicBlur;
+import com.facebook.react.bridge.ReactContext;
+import java.util.HashMap;
+
+@SuppressLint("ViewConstructor")
+class FeGaussianBlurView extends FilterPrimitiveView {
+  String mIn1;
+  float mStdDeviationX;
+  float mStdDeviationY;
+  FilterProperties.EdgeMode mEdgeMode;
+
+  public FeGaussianBlurView(ReactContext reactContext) {
+    super(reactContext);
+  }
+
+  public void setIn1(String in1) {
+    this.mIn1 = in1;
+    invalidate();
+  }
+
+  public void setStdDeviationX(float stdDeviationX) {
+    this.mStdDeviationX = stdDeviationX;
+    invalidate();
+  }
+
+  public void setStdDeviationY(float stdDeviationY) {
+    this.mStdDeviationY = stdDeviationY;
+    invalidate();
+  }
+
+  public void setEdgeMode(String edgeMode) {
+    this.mEdgeMode = FilterProperties.EdgeMode.getEnum(edgeMode);
+    invalidate();
+  }
+
+  @Override
+  public Bitmap applyFilter(HashMap<String, Bitmap> resultsMap, Bitmap prevResult) {
+    Bitmap source = getSource(resultsMap, prevResult, this.mIn1);
+    return blur(getContext(), source);
+  }
+
+  private Bitmap blur(Context context, Bitmap bitmap) {
+    // Android blur radius is much weaker than SVG's, so we need to scale it up.
+    float stdDeviation = Math.max(mStdDeviationX, mStdDeviationY) * 2;
+    if (stdDeviation <= 0) return bitmap;
+    final float maxRadius = 25.0f;
+    float radius = Math.min(stdDeviation, maxRadius);
+
+    Bitmap outputBitmap = Bitmap.createBitmap(bitmap);
+
+    RenderScript rs = RenderScript.create(context);
+    ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
+
+    Allocation tmpIn = Allocation.createFromBitmap(rs, bitmap);
+    Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);
+
+    blurScript.setRadius(radius);
+    blurScript.setInput(tmpIn);
+    blurScript.forEach(tmpOut);
+
+    tmpOut.copyTo(outputBitmap);
+
+    rs.destroy();
+
+    return Bitmap.createScaledBitmap(outputBitmap, bitmap.getWidth(), bitmap.getHeight(), false);
+  }
+}

android/src/main/java/com/horcrux/svg/RenderableViewManager.java

@@ -105,6 +105,8 @@
 import com.facebook.react.viewmanagers.RNSVGEllipseManagerInterface;
 import com.facebook.react.viewmanagers.RNSVGFeColorMatrixManagerDelegate;
 import com.facebook.react.viewmanagers.RNSVGFeColorMatrixManagerInterface;
+import com.facebook.react.viewmanagers.RNSVGFeGaussianBlurManagerDelegate;
+import com.facebook.react.viewmanagers.RNSVGFeGaussianBlurManagerInterface;
 import com.facebook.react.viewmanagers.RNSVGFilterManagerDelegate;
 import com.facebook.react.viewmanagers.RNSVGFilterManagerInterface;
 import com.facebook.react.viewmanagers.RNSVGForeignObjectManagerDelegate;
@@ -584,6 +586,7 @@ protected enum SVGClass {
     RNSVGMask,
     RNSVGFilter,
     RNSVGFeColorMatrix,
+    RNSVGFeGaussianBlur,
     RNSVGMarker,
     RNSVGForeignObject,
   }
@@ -632,6 +635,8 @@ protected VirtualView createViewInstance(@Nonnull ThemedReactContext reactContex
         return new FilterView(reactContext);
       case RNSVGFeColorMatrix:
         return new FeColorMatrixView(reactContext);
+      case RNSVGFeGaussianBlur:
+        return new FeGaussianBlurView(reactContext);
       case RNSVGMarker:
         return new MarkerView(reactContext);
       case RNSVGForeignObject:
@@ -1387,6 +1392,61 @@ public void setValues(FeColorMatrixView node, @Nullable ReadableArray values) {
     }
   }
 
+  static class FeGaussianBlurManager extends VirtualViewManager<FeGaussianBlurView>
+      implements RNSVGFeGaussianBlurManagerInterface<FeGaussianBlurView> {
+    FeGaussianBlurManager() {
+      super(SVGClass.RNSVGFeGaussianBlur);
+      mDelegate = new RNSVGFeGaussianBlurManagerDelegate(this);
+    }
+
+    public static final String REACT_CLASS = "RNSVGFeGaussianBlur";
+
+    @ReactProp(name = "x")
+    public void setX(FeGaussianBlurView node, Dynamic x) {
+      node.setX(x);
+    }
+
+    @ReactProp(name = "y")
+    public void setY(FeGaussianBlurView node, Dynamic y) {
+      node.setY(y);
+    }
+
+    @ReactProp(name = "width")
+    public void setWidth(FeGaussianBlurView node, Dynamic width) {
+      node.setWidth(width);
+    }
+
+    @ReactProp(name = "height")
+    public void setHeight(FeGaussianBlurView node, Dynamic height) {
+      node.setHeight(height);
+    }
+
+    @ReactProp(name = "result")
+    public void setResult(FeGaussianBlurView node, String result) {
+      node.setResult(result);
+    }
+
+    @ReactProp(name = "in1")
+    public void setIn1(FeGaussianBlurView node, String in1) {
+      node.setIn1(in1);
+    }
+
+    @ReactProp(name = "stdDeviationX")
+    public void setStdDeviationX(FeGaussianBlurView node, float stdDeviationX) {
+      node.setStdDeviationX(stdDeviationX);
+    }
+
+    @ReactProp(name = "stdDeviationY")
+    public void setStdDeviationY(FeGaussianBlurView node, float stdDeviationY) {
+      node.setStdDeviationY(stdDeviationY);
+    }
+
+    @ReactProp(name = "values")
+    public void setEdgeMode(FeGaussianBlurView node, String edgeMode) {
+      node.setEdgeMode(edgeMode);
+    }
+  }
+
   static class ForeignObjectManager extends GroupViewManagerAbstract<ForeignObjectView>
       implements RNSVGForeignObjectManagerInterface<ForeignObjectView> {
     ForeignObjectManager() {

android/src/main/java/com/horcrux/svg/SvgPackage.java

@@ -223,6 +223,15 @@ public NativeModule get() {
                   return new FeColorMatrixManager();
                 }
               }));
+      specs.put(
+          FeGaussianBlurManager.REACT_CLASS,
+          ModuleSpec.viewManagerSpec(
+              new Provider<NativeModule>() {
+                @Override
+                public NativeModule get() {
+                  return new FeGaussianBlurManager();
+                }
+              }));
       specs.put(
           ForeignObjectManager.REACT_CLASS,
           ModuleSpec.viewManagerSpec(

android/src/paper/java/com/facebook/react/viewmanagers/RNSVGFeGaussianBlurManagerDelegate.java

@@ -0,0 +1,56 @@
+/**
+* This code was generated by [react-native-codegen](https://www.npmjs.com/package/react-native-codegen).
+*
+* Do not edit this file as changes may cause incorrect behavior and will be lost
+* once the code is regenerated.
+*
+* @generated by codegen project: GeneratePropsJavaDelegate.js
+*/
+
+package com.facebook.react.viewmanagers;
+
+import android.view.View;
+import androidx.annotation.Nullable;
+import com.facebook.react.bridge.DynamicFromObject;
+import com.facebook.react.uimanager.BaseViewManagerDelegate;
+import com.facebook.react.uimanager.BaseViewManagerInterface;
+
+public class RNSVGFeGaussianBlurManagerDelegate<T extends View, U extends BaseViewManagerInterface<T> & RNSVGFeGaussianBlurManagerInterface<T>> extends BaseViewManagerDelegate<T, U> {
+  public RNSVGFeGaussianBlurManagerDelegate(U viewManager) {
+    super(viewManager);
+  }
+  @Override
+  public void setProperty(T view, String propName, @Nullable Object value) {
+    switch (propName) {
+      case "x":
+        mViewManager.setX(view, new DynamicFromObject(value));
+        break;
+      case "y":
+        mViewManager.setY(view, new DynamicFromObject(value));
+        break;
+      case "width":
+        mViewManager.setWidth(view, new DynamicFromObject(value));
+        break;
+      case "height":
+        mViewManager.setHeight(view, new DynamicFromObject(value));
+        break;
+      case "result":
+        mViewManager.setResult(view, value == null ? null : (String) value);
+        break;
+      case "in1":
+        mViewManager.setIn1(view, value == null ? null : (String) value);
+        break;
+      case "stdDeviationX":
+        mViewManager.setStdDeviationX(view, value == null ? 0f : ((Double) value).floatValue());
+        break;
+      case "stdDeviationY":
+        mViewManager.setStdDeviationY(view, value == null ? 0f : ((Double) value).floatValue());
+        break;
+      case "edgeMode":
+        mViewManager.setEdgeMode(view, (String) value);
+        break;
+      default:
+        super.setProperty(view, propName, value);
+    }
+  }
+}

android/src/paper/java/com/facebook/react/viewmanagers/RNSVGFeGaussianBlurManagerInterface.java

@@ -0,0 +1,26 @@
+/**
+* This code was generated by [react-native-codegen](https://www.npmjs.com/package/react-native-codegen).
+*
+* Do not edit this file as changes may cause incorrect behavior and will be lost
+* once the code is regenerated.
+*
+* @generated by codegen project: GeneratePropsJavaInterface.js
+*/
+
+package com.facebook.react.viewmanagers;
+
+import android.view.View;
+import androidx.annotation.Nullable;
+import com.facebook.react.bridge.Dynamic;
+
+public interface RNSVGFeGaussianBlurManagerInterface<T extends View> {
+  void setX(T view, Dynamic value);
+  void setY(T view, Dynamic value);
+  void setWidth(T view, Dynamic value);
+  void setHeight(T view, Dynamic value);
+  void setResult(T view, @Nullable String value);
+  void setIn1(T view, @Nullable String value);
+  void setStdDeviationX(T view, float value);
+  void setStdDeviationY(T view, float value);
+  void setEdgeMode(T view, @Nullable String value);
+}

apple/Filters/RNSVGEdgeModeTypes.h → apple/Filters/RNSVGEdgeMode.h

@@ -1,4 +1,4 @@
-typedef CF_ENUM(int32_t, RNSVGEdgeModeTypes) {
+typedef CF_ENUM(int32_t, RNSVGEdgeMode) {
   SVG_EDGEMODE_UNKNOWN,
   SVG_EDGEMODE_DUPLICATE,
   SVG_EDGEMODE_WRAP,

apple/Filters/RNSVGFeColorMatrix.mm

@@ -160,8 +160,6 @@ - (CIImage *)applyFilter:(NSMutableDictionary<NSString *, CIImage *> *)results p
   [filter setValue:inputImage forKey:@"inputImage"];
 
   return [filter valueForKey:@"outputImage"];
-
-  return nil;
 }
 
 #ifdef RCT_NEW_ARCH_ENABLED

apple/Filters/RNSVGFeGaussianBlur.h

@@ -0,0 +1,11 @@
+#import "RNSVGEdgeMode.h"
+#import "RNSVGFilterPrimitive.h"
+
+@interface RNSVGFeGaussianBlur : RNSVGFilterPrimitive
+
+@property (nonatomic, strong) NSString *in1;
+@property (nonatomic, strong) NSNumber *stdDeviationX;
+@property (nonatomic, strong) NSNumber *stdDeviationY;
+@property (nonatomic, assign) RNSVGEdgeMode edgeMode;
+
+@end