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