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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 /**
     20  * Intrinsic for applying a per-channel lookup table. Each
     21  * channel of the input has an independant lookup table. The
     22  * tables are 256 entries in size and can cover the full value
     23  * range of {@link Element#U8_4}.
     24  **/
     25 public final class ScriptIntrinsicLUT extends ScriptIntrinsic {
     26     private final Matrix4f mMatrix = new Matrix4f();
     27     private Allocation mTables;
     28     private final byte mCache[] = new byte[1024];
     29     private boolean mDirty = true;
     30 
     31     private ScriptIntrinsicLUT(long id, RenderScript rs) {
     32         super(id, rs);
     33         mTables = Allocation.createSized(rs, Element.U8(rs), 1024);
     34         for (int ct=0; ct < 256; ct++) {
     35             mCache[ct] = (byte)ct;
     36             mCache[ct + 256] = (byte)ct;
     37             mCache[ct + 512] = (byte)ct;
     38             mCache[ct + 768] = (byte)ct;
     39         }
     40         setVar(0, mTables);
     41     }
     42 
     43     /**
     44      * Supported elements types are {@link Element#U8_4}
     45      *
     46      * The defaults tables are identity.
     47      *
     48      * @param rs The RenderScript context
     49      * @param e Element type for intputs and outputs
     50      *
     51      * @return ScriptIntrinsicLUT
     52      */
     53     public static ScriptIntrinsicLUT create(RenderScript rs, Element e) {
     54         long id = rs.nScriptIntrinsicCreate(3, e.getID(rs));
     55         return new ScriptIntrinsicLUT(id, rs);
     56 
     57     }
     58 
     59 
     60     private void validate(int index, int value) {
     61         if (index < 0 || index > 255) {
     62             throw new RSIllegalArgumentException("Index out of range (0-255).");
     63         }
     64         if (value < 0 || value > 255) {
     65             throw new RSIllegalArgumentException("Value out of range (0-255).");
     66         }
     67     }
     68 
     69     /**
     70      * Set an entry in the red channel lookup table
     71      *
     72      * @param index Must be 0-255
     73      * @param value Must be 0-255
     74      */
     75     public void setRed(int index, int value) {
     76         validate(index, value);
     77         mCache[index] = (byte)value;
     78         mDirty = true;
     79     }
     80 
     81     /**
     82      * Set an entry in the green channel lookup table
     83      *
     84      * @param index Must be 0-255
     85      * @param value Must be 0-255
     86      */
     87     public void setGreen(int index, int value) {
     88         validate(index, value);
     89         mCache[index+256] = (byte)value;
     90         mDirty = true;
     91     }
     92 
     93     /**
     94      * Set an entry in the blue channel lookup table
     95      *
     96      * @param index Must be 0-255
     97      * @param value Must be 0-255
     98      */
     99     public void setBlue(int index, int value) {
    100         validate(index, value);
    101         mCache[index+512] = (byte)value;
    102         mDirty = true;
    103     }
    104 
    105     /**
    106      * Set an entry in the alpha channel lookup table
    107      *
    108      * @param index Must be 0-255
    109      * @param value Must be 0-255
    110      */
    111     public void setAlpha(int index, int value) {
    112         validate(index, value);
    113         mCache[index+768] = (byte)value;
    114         mDirty = true;
    115     }
    116 
    117     /**
    118      * Invoke the kernel and apply the lookup to each cell of ain
    119      * and copy to aout.
    120      *
    121      * @param ain Input allocation
    122      * @param aout Output allocation
    123      */
    124     public void forEach(Allocation ain, Allocation aout) {
    125         forEach(ain, aout, null);
    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      * @param opt Options for clipping
    135      */
    136     public void forEach(Allocation ain, Allocation aout, Script.LaunchOptions opt) {
    137         if (mDirty) {
    138             mDirty = false;
    139             mTables.copyFromUnchecked(mCache);
    140         }
    141         forEach(0, ain, aout, null, opt);
    142     }
    143 
    144     /**
    145      * Get a KernelID for this intrinsic kernel.
    146      *
    147      * @return Script.KernelID The KernelID object.
    148      */
    149     public Script.KernelID getKernelID() {
    150         return createKernelID(0, 3, null, null);
    151     }
    152 }
    153 
    154