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
17package android.support.v8.renderscript;
18
19import 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 **/
27public 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