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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.renderscript;
     18 
     19 import android.content.Context;
     20 import android.content.res.Resources;
     21 import android.util.Log;
     22 
     23 /**
     24  * Intrinsic Gausian blur filter. Applies a gaussian blur of the
     25  * specified radius to all elements of an allocation.
     26  *
     27  *
     28  **/
     29 public final class ScriptIntrinsicBlur extends ScriptIntrinsic {
     30     private final float[] mValues = new float[9];
     31     private Allocation mInput;
     32 
     33     private ScriptIntrinsicBlur(int id, RenderScript rs) {
     34         super(id, rs);
     35     }
     36 
     37     /**
     38      * Create an intrinsic for applying a blur to an allocation. The
     39      * default radius is 5.0.
     40      *
     41      * Supported elements types are {@link Element#U8_4}
     42      *
     43      * @param rs The RenderScript context
     44      * @param e Element type for inputs and outputs
     45      *
     46      * @return ScriptIntrinsicBlur
     47      */
     48     public static ScriptIntrinsicBlur create(RenderScript rs, Element e) {
     49         if ((!e.isCompatible(Element.U8_4(rs))) && (!e.isCompatible(Element.U8(rs)))) {
     50             throw new RSIllegalArgumentException("Unsuported element type.");
     51         }
     52         int id = rs.nScriptIntrinsicCreate(5, e.getID(rs));
     53         ScriptIntrinsicBlur sib = new ScriptIntrinsicBlur(id, rs);
     54         sib.setRadius(5.f);
     55         return sib;
     56     }
     57 
     58     /**
     59      * Set the input of the blur.
     60      * Must match the element type supplied during create.
     61      *
     62      * @param ain The input allocation
     63      */
     64     public void setInput(Allocation ain) {
     65         mInput = ain;
     66         setVar(1, ain);
     67     }
     68 
     69     /**
     70      * Set the radius of the Blur.
     71      *
     72      * Supported range 0 < radius <= 25
     73      *
     74      * @param radius The radius of the blur
     75      */
     76     public void setRadius(float radius) {
     77         if (radius <= 0 || radius > 25) {
     78             throw new RSIllegalArgumentException("Radius out of range (0 < r <= 25).");
     79         }
     80         setVar(0, radius);
     81     }
     82 
     83     /**
     84      * Apply the filter to the input and save to the specified
     85      * allocation.
     86      *
     87      * @param aout Output allocation. Must match creation element
     88      *             type.
     89      */
     90     public void forEach(Allocation aout) {
     91         forEach(0, null, aout, null);
     92     }
     93 
     94     /**
     95      * Get a KernelID for this intrinsic kernel.
     96      *
     97      * @return Script.KernelID The KernelID object.
     98      */
     99     public Script.KernelID getKernelID() {
    100         return createKernelID(0, 2, null, null);
    101     }
    102 
    103     /**
    104      * Get a FieldID for the input field of this intrinsic.
    105      *
    106      * @return Script.FieldID The FieldID object.
    107      */
    108     public Script.FieldID getFieldID_Input() {
    109         return createFieldID(1, null);
    110     }
    111 }
    112 
    113