Feature: add filter of blur

CameraFilter/src/main/java/com/frank/camerafilter/factory/BeautyFilterFactory.java

@@ -2,6 +2,7 @@ package com.frank.camerafilter.factory;
 
 import android.content.Context;
 
+import com.frank.camerafilter.filter.advance.BeautyBlurFilter;
 import com.frank.camerafilter.filter.advance.BeautyHueFilter;
 import com.frank.camerafilter.filter.advance.BeautySketchFilter;
 import com.frank.camerafilter.filter.BaseFilter;
@@ -16,6 +17,8 @@ public class BeautyFilterFactory {
         switch (type) {
             case SKETCH:
                 return new BeautySketchFilter(context);
+            case BLUR:
+                return new BeautyBlurFilter(context);
             case HUE:
                 return new BeautyHueFilter(context);
             case WHITE_BALANCE:

CameraFilter/src/main/java/com/frank/camerafilter/factory/BeautyFilterType.java

@@ -2,6 +2,7 @@ package com.frank.camerafilter.factory;
 
 public enum BeautyFilterType {
     NONE,
+    BLUR,
     HUE,
     WHITE_BALANCE,
     SKETCH

CameraFilter/src/main/java/com/frank/camerafilter/filter/advance/BeautyBlurFilter.java

@@ -0,0 +1,33 @@
+package com.frank.camerafilter.filter.advance;
+
+import android.content.Context;
+import android.opengl.GLES30;
+
+import com.frank.camerafilter.R;
+import com.frank.camerafilter.filter.BaseFilter;
+import com.frank.camerafilter.util.OpenGLUtil;
+
+public class BeautyBlurFilter extends BaseFilter {
+
+    private int blurSize;
+
+    public BeautyBlurFilter(Context context) {
+        super(NORMAL_VERTEX_SHADER, OpenGLUtil.readShaderFromSource(context, R.raw.zoomblur));
+    }
+
+    protected void onInit() {
+        super.onInit();
+        blurSize = GLES30.glGetUniformLocation(getProgramId(), "blurSize");
+    }
+
+    protected void onInitialized() {
+        super.onInitialized();
+        setFloat(blurSize, 0.3f);
+    }
+
+    @Override
+    public void onInputSizeChanged(int width, int height) {
+        super.onInputSizeChanged(width, height);
+    }
+
+}

CameraFilter/src/main/res/raw/zoomblur.glsl

@@ -0,0 +1,24 @@
+varying highp vec2 textureCoordinate;
+
+uniform sampler2D inputImageTexture;
+
+uniform highp vec2 blurCenter;
+uniform highp float blurSize;
+
+void main()
+{
+	// TODO: Do a more intelligent scaling based on resolution here
+	highp vec2 samplingOffset = 1.0/100.0 * (blurCenter - textureCoordinate) * blurSize;
+
+	lowp vec4 fragmentColor = texture2D(inputImageTexture, textureCoordinate) * 0.18;
+	fragmentColor += texture2D(inputImageTexture, textureCoordinate + samplingOffset) * 0.15;
+	fragmentColor += texture2D(inputImageTexture, textureCoordinate + (2.0 * samplingOffset)) *  0.12;
+	fragmentColor += texture2D(inputImageTexture, textureCoordinate + (3.0 * samplingOffset)) * 0.09;
+	fragmentColor += texture2D(inputImageTexture, textureCoordinate + (4.0 * samplingOffset)) * 0.05;
+	fragmentColor += texture2D(inputImageTexture, textureCoordinate - samplingOffset) * 0.15;
+	fragmentColor += texture2D(inputImageTexture, textureCoordinate - (2.0 * samplingOffset)) *  0.12;
+	fragmentColor += texture2D(inputImageTexture, textureCoordinate - (3.0 * samplingOffset)) * 0.09;
+	fragmentColor += texture2D(inputImageTexture, textureCoordinate - (4.0 * samplingOffset)) * 0.05;
+
+	gl_FragColor = fragmentColor;
+}

app/src/main/java/com/frank/ffmpeg/activity/CameraFilterActivity.kt

@@ -15,6 +15,7 @@ class CameraFilterActivity : BaseActivity() {
 
     private val filterType: Array<BeautyFilterType> = arrayOf(
         BeautyFilterType.NONE,
+        BeautyFilterType.BLUR,
         BeautyFilterType.HUE,
         BeautyFilterType.WHITE_BALANCE,
         BeautyFilterType.SKETCH

app/src/main/java/com/frank/ffmpeg/util/FilterTypeUtil.kt

@@ -13,6 +13,7 @@ object FilterTypeUtil {
     fun filterTypeToNameId(type: BeautyFilterType): Int {
         return when (type) {
             BeautyFilterType.NONE -> R.string.camera_filter_none
+            BeautyFilterType.BLUR -> R.string.camera_filter_blur
             BeautyFilterType.HUE -> R.string.camera_filter_hue
             BeautyFilterType.WHITE_BALANCE -> R.string.camera_filter_balance
             BeautyFilterType.SKETCH -> R.string.camera_filter_sketch

app/src/main/res/values-en/strings.xml

@@ -116,5 +116,6 @@
     <string name="camera_filter_hue">Hue</string>
     <string name="camera_filter_balance">White balance</string>
     <string name="camera_filter_sketch">Sketch</string>
+    <string name="camera_filter_blur">Blur</string>
 
 </resources>

app/src/main/res/values/strings.xml

@@ -116,5 +116,6 @@
     <string name="camera_filter_hue">Hue</string>
     <string name="camera_filter_balance">白平衡</string>
     <string name="camera_filter_sketch">素描</string>
+    <string name="camera_filter_blur">模糊</string>
 
 </resources>