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#include "ip.rsh"
18
19int32_t gWidth;
20int32_t gHeight;
21rs_allocation gIn;
22
23float gCoeffs[9];
24
25uchar4 RS_KERNEL root(uint32_t x, uint32_t y) {
26    uint32_t x1 = min((int32_t)x+1, gWidth-1);
27    uint32_t x2 = max((int32_t)x-1, 0);
28    uint32_t y1 = min((int32_t)y+1, gHeight-1);
29    uint32_t y2 = max((int32_t)y-1, 0);
30
31    float4 p00 = convert_float4(rsGetElementAt_uchar4(gIn, x1, y1));
32    float4 p01 = convert_float4(rsGetElementAt_uchar4(gIn, x, y1));
33    float4 p02 = convert_float4(rsGetElementAt_uchar4(gIn, x2, y1));
34    float4 p10 = convert_float4(rsGetElementAt_uchar4(gIn, x1, y));
35    float4 p11 = convert_float4(rsGetElementAt_uchar4(gIn, x, y));
36    float4 p12 = convert_float4(rsGetElementAt_uchar4(gIn, x2, y));
37    float4 p20 = convert_float4(rsGetElementAt_uchar4(gIn, x1, y2));
38    float4 p21 = convert_float4(rsGetElementAt_uchar4(gIn, x, y2));
39    float4 p22 = convert_float4(rsGetElementAt_uchar4(gIn, x2, y2));
40    p00 *= gCoeffs[0];
41    p01 *= gCoeffs[1];
42    p02 *= gCoeffs[2];
43    p10 *= gCoeffs[3];
44    p11 *= gCoeffs[4];
45    p12 *= gCoeffs[5];
46    p20 *= gCoeffs[6];
47    p21 *= gCoeffs[7];
48    p22 *= gCoeffs[8];
49
50    p00 += p01;
51    p02 += p10;
52    p11 += p12;
53    p20 += p21;
54
55    p22 += p00;
56    p02 += p11;
57
58    p20 += p22;
59    p20 += p02;
60
61    p20 = clamp(p20, 0.f, 255.f);
62    return convert_uchar4(p20);
63}
64
65
66