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 __attribute__((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 result;
32
33    float4 p00 = convert_float4(rsGetElementAt_uchar4(gIn, x1, y1));
34    float4 p01 = convert_float4(rsGetElementAt_uchar4(gIn, x, y1));
35    float4 p02 = convert_float4(rsGetElementAt_uchar4(gIn, x2, y1));
36    float4 p10 = convert_float4(rsGetElementAt_uchar4(gIn, x1, y));
37    float4 p11 = convert_float4(rsGetElementAt_uchar4(gIn, x, y));
38    float4 p12 = convert_float4(rsGetElementAt_uchar4(gIn, x2, y));
39    float4 p20 = convert_float4(rsGetElementAt_uchar4(gIn, x1, y2));
40    float4 p21 = convert_float4(rsGetElementAt_uchar4(gIn, x, y2));
41    float4 p22 = convert_float4(rsGetElementAt_uchar4(gIn, x2, y2));
42
43    result = p00 * gCoeffs[0];
44    result += p01 * gCoeffs[1];
45    result += p02 * gCoeffs[2];
46    result += p10 * gCoeffs[3];
47    result += p11 * gCoeffs[4];
48    result += p12 * gCoeffs[5];
49    result += p20 * gCoeffs[6];
50    result += p21 * gCoeffs[7];
51    result += p22 * gCoeffs[8];
52
53    result = clamp(result, 0.f, 255.f);
54    return convert_uchar4(result);
55}
56
57
58