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 androidx.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 
ScriptIntrinsicLUT(long id, RenderScript rs)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      */
create(RenderScript rs, Element e)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