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