Filter Slow when I set 3 or 4 filter.

[ghost]

I custome Gaussian blur like TiltShiftFilter Instagram. If only 1 filter Gaussian Blur it's ok but I using Filter Group add 3 or 4 filter. It's slow and lag

[gkakasevski]

Hi truongnguyenptit, do you want to share your code for TiltShiftFilter?

[ghost]

My English very poor.

Hi Mr gkakasevski,

Of course, You can use class TiltShiftFilterGroup for linear TiltShift and GaussianSelectiveBlurFilter for radial TiltShift.

Code:

Class TiltShiftFilterGroup:

public class TiltShiftFilterGroup extends GaussianBlurPositionFilter {

protected static final String UNIFORM_ROTATION_FOCUS = "u_RotationFocus";

private float rotation;
private int rotationHandle;
public TiltShiftFilterGroup(float blurSize, float aspectRatio, PointF excludedCirclePoint, float excludedCircleRadius, float excludedBlurSize, float rotation) {
    super(blurSize, aspectRatio, excludedCirclePoint, excludedCircleRadius, excludedBlurSize);
    this.rotation = rotation;
}
@Override
protected String getFragmentShader() {
    return
             "precision mediump float;\n" 
            +"uniform sampler2D "+UNIFORM_TEXTURE0+";\n" 
            +"uniform sampler2D "+UNIFORM_TEXTUREBASE+1+";\n"
            +"varying vec2 "+VARYING_TEXCOORD+";\n" 
            +"uniform float "+UNIFORM_BLUR_SIZE+";\n"
            +"uniform float "+UNIFORM_ASPECT_RATIO+";\n"
            +"uniform vec2 "+UNIFORM_EXCLUDE_CIRCLE_POINT+";\n"
            +"uniform float "+UNIFORM_EXCLUDE_CIRCLE_RADIUS+";\n"

            +"uniform float "+UNIFORM_ROTATION_FOCUS+";\n"

            +"void main(){\n"
            +"   vec4 sharpImageColor = texture2D("+UNIFORM_TEXTURE0+", "+VARYING_TEXCOORD+");\n"
            +"   vec4 blurredImageColor = texture2D("+UNIFORM_TEXTUREBASE+1+", "+VARYING_TEXCOORD+");\n"


            +"   float distanceFromCenter = abs(("+VARYING_TEXCOORD+".x - "+UNIFORM_EXCLUDE_CIRCLE_POINT+".x) * "+UNIFORM_ASPECT_RATIO+"*cos("+UNIFORM_ROTATION_FOCUS+") + ("+VARYING_TEXCOORD+".y-"+UNIFORM_EXCLUDE_CIRCLE_POINT+".y)*sin("+UNIFORM_ROTATION_FOCUS+"));\n"

            +"   gl_FragColor = mix(sharpImageColor, blurredImageColor, smoothstep("+UNIFORM_EXCLUDE_CIRCLE_RADIUS+" - "+UNIFORM_BLUR_SIZE+", "+UNIFORM_EXCLUDE_CIRCLE_RADIUS+", distanceFromCenter));\n"
            +"}\n";
}

@Override
protected void initShaderHandles() {
    super.initShaderHandles();
    rotationHandle = GLES20.glGetUniformLocation(programHandle, UNIFORM_ROTATION_FOCUS);
} 

@Override
protected void passShaderValues() {
    super.passShaderValues();
    GLES20.glUniform1f(rotationHandle, rotation);
}

Class GaussianSelectiveBlurFilter:

public class GaussianSelectiveBlurFilter extends GaussianBlurPositionFilter {

public GaussianSelectiveBlurFilter(float blurSize, float aspectRatio, PointF excludedCirclePoint, float excludedCircleRadius, float excludedBlurSize) {
    super(blurSize, aspectRatio, excludedCirclePoint, excludedCircleRadius, excludedBlurSize);
}

@Override
protected String getFragmentShader() {
    return
             "precision mediump float;\n" 
            +"uniform sampler2D "+UNIFORM_TEXTURE0+";\n" 
            +"uniform sampler2D "+UNIFORM_TEXTUREBASE+1+";\n"
            +"varying vec2 "+VARYING_TEXCOORD+";\n" 
            +"uniform float "+UNIFORM_BLUR_SIZE+";\n"
            +"uniform float "+UNIFORM_ASPECT_RATIO+";\n"
            +"uniform vec2 "+UNIFORM_EXCLUDE_CIRCLE_POINT+";\n"
            +"uniform float "+UNIFORM_EXCLUDE_CIRCLE_RADIUS+";\n"


            +"void main(){\n"
            +"   vec4 sharpImageColor = texture2D("+UNIFORM_TEXTURE0+", "+VARYING_TEXCOORD+");\n"
            +"   vec4 blurredImageColor = texture2D("+UNIFORM_TEXTUREBASE+1+", "+VARYING_TEXCOORD+");\n"
            +"   vec2 texCoordAfterAspect = vec2("+VARYING_TEXCOORD+".x, "+VARYING_TEXCOORD+".y * "+UNIFORM_ASPECT_RATIO+" + 0.5 - 0.5 * "+UNIFORM_ASPECT_RATIO+");\n"
            +"   float distanceFromCenter = distance("+UNIFORM_EXCLUDE_CIRCLE_POINT+", texCoordAfterAspect);\n"
            +"   gl_FragColor = mix(sharpImageColor, blurredImageColor, smoothstep("+UNIFORM_EXCLUDE_CIRCLE_RADIUS+" - "+UNIFORM_BLUR_SIZE+", "+UNIFORM_EXCLUDE_CIRCLE_RADIUS+", distanceFromCenter));\n"
            +"}\n";
}

}

How to use:
BasicFilter filter = new GaussianSelectiveBlurFilter(4f, 1f, new PointF(x,y), radius, radius);
BasicFilter filter = new TiltShiftFilterGroup(4f, 1f, new PointF(x,y), radius, radius, (float)(Math.PI*2-angle+Math.PI/2));

I hope help you.