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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.support.v8.renderscript;
     18 
     19 import android.util.Log;
     20 
     21 /**
     22  * Intrinsic for applying a per-channel lookup table. Each
     23  * channel of the input has an independant lookup table. The
     24  * tables are 256 entries in size and can cover the full value
     25  * range of {@link Element#U8_4}.
     26  **/
     27 public class ScriptIntrinsicLUT extends ScriptIntrinsic {
     28     private final Matrix4f mMatrix = new Matrix4f();
     29     private Allocation mTables;
     30     private final byte mCache[] = new byte[1024];
     31     private boolean mDirty = true;
     32     // API level for the intrinsic
     33     private static final int INTRINSIC_API_LEVEL = 19;
     34 
     35     protected ScriptIntrinsicLUT(long id, RenderScript rs) {
     36         super(id, rs);
     37     }
     38 
     39     /**
     40      * Supported elements types are {@link Element#U8_4}
     41      *
     42      * The defaults tables are identity.
     43      *
     44      * @param rs The RenderScript context
     45      * @param e Element type for intputs and outputs
     46      *
     47      * @return ScriptIntrinsicLUT
     48      */
     49     public static ScriptIntrinsicLUT create(RenderScript rs, Element e) {
     50         long id;
     51         boolean mUseIncSupp = rs.isUseNative() &&
     52                               android.os.Build.VERSION.SDK_INT < INTRINSIC_API_LEVEL;
     53 
     54         id = rs.nScriptIntrinsicCreate(3, e.getID(rs), mUseIncSupp);
     55 
     56         ScriptIntrinsicLUT si = new ScriptIntrinsicLUT(id, rs);
     57         si.setIncSupp(mUseIncSupp);
     58         si.mTables = Allocation.createSized(rs, Element.U8(rs), 1024);
     59         for (int ct=0; ct < 256; ct++) {
     60             si.mCache[ct] = (byte)ct;
     61             si.mCache[ct + 256] = (byte)ct;
     62             si.mCache[ct + 512] = (byte)ct;
     63             si.mCache[ct + 768] = (byte)ct;
     64         }
     65         si.setVar(0, si.mTables);
     66         return si;
     67     }
     68 
     69 
     70     private void validate(int index, int value) {
     71         if (index < 0 || index > 255) {
     72             throw new RSIllegalArgumentException("Index out of range (0-255).");
     73         }
     74         if (value < 0 || value > 255) {
     75             throw new RSIllegalArgumentException("Value out of range (0-255).");
     76         }
     77     }
     78 
     79     /**
     80      * Set an entry in the red channel lookup table
     81      *
     82      * @param index Must be 0-255
     83      * @param value Must be 0-255
     84      */
     85     public void setRed(int index, int value) {
     86         validate(index, value);
     87         mCache[index] = (byte)value;
     88         mDirty = true;
     89     }
     90 
     91     /**
     92      * Set an entry in the green channel lookup table
     93      *
     94      * @param index Must be 0-255
     95      * @param value Must be 0-255
     96      */
     97     public void setGreen(int index, int value) {
     98         validate(index, value);
     99         mCache[index+256] = (byte)value;
    100         mDirty = true;
    101     }
    102 
    103     /**
    104      * Set an entry in the blue channel lookup table
    105      *
    106      * @param index Must be 0-255
    107      * @param value Must be 0-255
    108      */
    109     public void setBlue(int index, int value) {
    110         validate(index, value);
    111         mCache[index+512] = (byte)value;
    112         mDirty = true;
    113     }
    114 
    115     /**
    116      * Set an entry in the alpha channel lookup table
    117      *
    118      * @param index Must be 0-255
    119      * @param value Must be 0-255
    120      */
    121     public void setAlpha(int index, int value) {
    122         validate(index, value);
    123         mCache[index+768] = (byte)value;
    124         mDirty = true;
    125     }
    126 
    127 
    128     /**
    129      * Invoke the kernel and apply the lookup to each cell of ain
    130      * and copy to aout.
    131      *
    132      * @param ain Input allocation
    133      * @param aout Output allocation
    134      */
    135     public void forEach(Allocation ain, Allocation aout) {
    136         if (mDirty) {
    137             mDirty = false;
    138             mTables.copyFromUnchecked(mCache);
    139         }
    140         forEach(0, ain, aout, null);
    141     }
    142 
    143     /**
    144      * Get a KernelID for this intrinsic kernel.
    145      *
    146      * @return Script.KernelID The KernelID object.
    147      */
    148     public Script.KernelID getKernelID() {
    149         return createKernelID(0, 3, null, null);
    150     }
    151 }
    152 
    153