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#pragma version(1)
18#pragma rs java_package_name(com.android.gallery3d.filtershow.filters)
19#pragma rs_fp_relaxed
20
21int32_t gWidth;
22int32_t gHeight;
23const uchar4 *gPixels;
24rs_allocation gIn;
25
26float gCoeffs[9];
27
28void root(const uchar4 *in, uchar4 *out, const void *usrData, uint32_t x, uint32_t y) {
29    uint32_t x1 = min((int32_t)x+1, gWidth-1);
30    uint32_t x2 = max((int32_t)x-1, 0);
31    uint32_t y1 = min((int32_t)y+1, gHeight-1);
32    uint32_t y2 = max((int32_t)y-1, 0);
33
34    float4 p00 = rsUnpackColor8888(gPixels[x1 + gWidth * y1]);
35    float4 p01 = rsUnpackColor8888(gPixels[x + gWidth * y1]);
36    float4 p02 = rsUnpackColor8888(gPixels[x2 + gWidth * y1]);
37    float4 p10 = rsUnpackColor8888(gPixels[x1 + gWidth * y]);
38    float4 p11 = rsUnpackColor8888(gPixels[x + gWidth * y]);
39    float4 p12 = rsUnpackColor8888(gPixels[x2 + gWidth * y]);
40    float4 p20 = rsUnpackColor8888(gPixels[x1 + gWidth * y2]);
41    float4 p21 = rsUnpackColor8888(gPixels[x + gWidth * y2]);
42    float4 p22 = rsUnpackColor8888(gPixels[x2 + gWidth * y2]);
43
44    p00 *= gCoeffs[0];
45    p01 *= gCoeffs[1];
46    p02 *= gCoeffs[2];
47    p10 *= gCoeffs[3];
48    p11 *= gCoeffs[4];
49    p12 *= gCoeffs[5];
50    p20 *= gCoeffs[6];
51    p21 *= gCoeffs[7];
52    p22 *= gCoeffs[8];
53
54    p00 += p01;
55    p02 += p10;
56    p11 += p12;
57    p20 += p21;
58
59    p22 += p00;
60    p02 += p11;
61
62    p20 += p22;
63    p20 += p02;
64
65    p20 = clamp(p20, 0.f, 1.f);
66    *out = rsPackColorTo8888(p20.r, p20.g, p20.b);
67}
68