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 color matrix to allocations.
23 *
24 * This has the same effect as loading each element and
25 * converting it to a {@link Element#F32_4}, multiplying the
26 * result by the 4x4 color matrix as performed by
27 * rsMatrixMultiply() and writing it to the output after
28 * conversion back to {@link Element#U8_4}.
29 **/
30public class ScriptIntrinsicColorMatrix extends ScriptIntrinsic {
31    private final Matrix4f mMatrix = new Matrix4f();
32    private Allocation mInput;
33
34    protected ScriptIntrinsicColorMatrix(int id, RenderScript rs) {
35        super(id, rs);
36    }
37
38    /**
39     * Create an intrinsic for applying a color matrix to an
40     * allocation.
41     *
42     * Supported elements types are {@link Element#U8_4}
43     *
44     * @param rs The RenderScript context
45     * @param e Element type for intputs and outputs
46     *
47     * @return ScriptIntrinsicColorMatrix
48     */
49    public static ScriptIntrinsicColorMatrix create(RenderScript rs, Element e) {
50        if (rs.isNative) {
51            RenderScriptThunker rst = (RenderScriptThunker) rs;
52            return ScriptIntrinsicColorMatrixThunker.create(rs, e);
53        }
54
55        if (!e.isCompatible(Element.U8_4(rs))) {
56            throw new RSIllegalArgumentException("Unsuported element type.");
57        }
58        int id = rs.nScriptIntrinsicCreate(2, e.getID(rs));
59        return new ScriptIntrinsicColorMatrix(id, rs);
60
61    }
62
63    private void setMatrix() {
64        FieldPacker fp = new FieldPacker(16*4);
65        fp.addMatrix(mMatrix);
66        setVar(0, fp);
67    }
68
69    /**
70     * Set the color matrix which will be applied to each cell of
71     * the image.
72     *
73     * @param m The 4x4 matrix to set.
74     */
75    public void setColorMatrix(Matrix4f m) {
76        mMatrix.load(m);
77        setMatrix();
78    }
79
80    /**
81     * Set the color matrix which will be applied to each cell of the image.
82     * This will set the alpha channel to be a copy.
83     *
84     * @param m The 3x3 matrix to set.
85     */
86    public void setColorMatrix(Matrix3f m) {
87        mMatrix.load(m);
88        setMatrix();
89    }
90
91    /**
92     * Set a color matrix to convert from RGB to luminance. The alpha channel
93     * will be a copy.
94     *
95     */
96    public void setGreyscale() {
97        mMatrix.loadIdentity();
98        mMatrix.set(0, 0, 0.299f);
99        mMatrix.set(1, 0, 0.587f);
100        mMatrix.set(2, 0, 0.114f);
101        mMatrix.set(0, 1, 0.299f);
102        mMatrix.set(1, 1, 0.587f);
103        mMatrix.set(2, 1, 0.114f);
104        mMatrix.set(0, 2, 0.299f);
105        mMatrix.set(1, 2, 0.587f);
106        mMatrix.set(2, 2, 0.114f);
107        setMatrix();
108    }
109
110    /**
111     * Set the matrix to convert from YUV to RGB with a direct copy of the 4th
112     * channel.
113     *
114     */
115    public void setYUVtoRGB() {
116        mMatrix.loadIdentity();
117        mMatrix.set(0, 0, 1.f);
118        mMatrix.set(1, 0, 0.f);
119        mMatrix.set(2, 0, 1.13983f);
120        mMatrix.set(0, 1, 1.f);
121        mMatrix.set(1, 1, -0.39465f);
122        mMatrix.set(2, 1, -0.5806f);
123        mMatrix.set(0, 2, 1.f);
124        mMatrix.set(1, 2, 2.03211f);
125        mMatrix.set(2, 2, 0.f);
126        setMatrix();
127    }
128
129    /**
130     * Set the matrix to convert from RGB to YUV with a direct copy of the 4th
131     * channel.
132     *
133     */
134    public void setRGBtoYUV() {
135        mMatrix.loadIdentity();
136        mMatrix.set(0, 0, 0.299f);
137        mMatrix.set(1, 0, 0.587f);
138        mMatrix.set(2, 0, 0.114f);
139        mMatrix.set(0, 1, -0.14713f);
140        mMatrix.set(1, 1, -0.28886f);
141        mMatrix.set(2, 1, 0.436f);
142        mMatrix.set(0, 2, 0.615f);
143        mMatrix.set(1, 2, -0.51499f);
144        mMatrix.set(2, 2, -0.10001f);
145        setMatrix();
146    }
147
148
149    /**
150     * Invoke the kernel and apply the matrix to each cell of ain and copy to
151     * aout.
152     *
153     * @param ain Input allocation
154     * @param aout Output allocation
155     */
156    public void forEach(Allocation ain, Allocation aout) {
157        forEach(0, ain, aout, null);
158    }
159
160    /**
161     * Get a KernelID for this intrinsic kernel.
162     *
163     * @return Script.KernelID The KernelID object.
164     */
165    public Script.KernelID getKernelID() {
166        return createKernelID(0, 3, null, null);
167    }
168
169}
170
171