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#pragma rs_fp_relaxed
19
20int32_t gWidth;
21int32_t gHeight;
22rs_allocation gIn;
23
24float gCoeffs[25];
25
26uchar4 RS_KERNEL root(uint32_t x, uint32_t y) {
27    uint32_t x0 = max((int32_t)x-2, 0);
28    uint32_t x1 = max((int32_t)x-1, 0);
29    uint32_t x2 = x;
30    uint32_t x3 = min((int32_t)x+1, gWidth-1);
31    uint32_t x4 = min((int32_t)x+2, gWidth-1);
32
33    uint32_t y0 = max((int32_t)y-2, 0);
34    uint32_t y1 = max((int32_t)y-1, 0);
35    uint32_t y2 = y;
36    uint32_t y3 = min((int32_t)y+1, gHeight-1);
37    uint32_t y4 = min((int32_t)y+2, gHeight-1);
38
39    float4 sum = convert_float4(rsGetElementAt_uchar4(gIn, x0, y0)) * gCoeffs[0]
40               + convert_float4(rsGetElementAt_uchar4(gIn, x1, y0)) * gCoeffs[1]
41               + convert_float4(rsGetElementAt_uchar4(gIn, x2, y0)) * gCoeffs[2]
42               + convert_float4(rsGetElementAt_uchar4(gIn, x3, y0)) * gCoeffs[3]
43               + convert_float4(rsGetElementAt_uchar4(gIn, x4, y0)) * gCoeffs[4]
44
45               + convert_float4(rsGetElementAt_uchar4(gIn, x0, y1)) * gCoeffs[5]
46               + convert_float4(rsGetElementAt_uchar4(gIn, x1, y1)) * gCoeffs[6]
47               + convert_float4(rsGetElementAt_uchar4(gIn, x2, y1)) * gCoeffs[7]
48               + convert_float4(rsGetElementAt_uchar4(gIn, x3, y1)) * gCoeffs[8]
49               + convert_float4(rsGetElementAt_uchar4(gIn, x4, y1)) * gCoeffs[9]
50
51               + convert_float4(rsGetElementAt_uchar4(gIn, x0, y2)) * gCoeffs[10]
52               + convert_float4(rsGetElementAt_uchar4(gIn, x1, y2)) * gCoeffs[11]
53               + convert_float4(rsGetElementAt_uchar4(gIn, x2, y2)) * gCoeffs[12]
54               + convert_float4(rsGetElementAt_uchar4(gIn, x3, y2)) * gCoeffs[13]
55               + convert_float4(rsGetElementAt_uchar4(gIn, x4, y2)) * gCoeffs[14]
56
57               + convert_float4(rsGetElementAt_uchar4(gIn, x0, y3)) * gCoeffs[15]
58               + convert_float4(rsGetElementAt_uchar4(gIn, x1, y3)) * gCoeffs[16]
59               + convert_float4(rsGetElementAt_uchar4(gIn, x2, y3)) * gCoeffs[17]
60               + convert_float4(rsGetElementAt_uchar4(gIn, x3, y3)) * gCoeffs[18]
61               + convert_float4(rsGetElementAt_uchar4(gIn, x4, y3)) * gCoeffs[19]
62
63               + convert_float4(rsGetElementAt_uchar4(gIn, x0, y4)) * gCoeffs[20]
64               + convert_float4(rsGetElementAt_uchar4(gIn, x1, y4)) * gCoeffs[21]
65               + convert_float4(rsGetElementAt_uchar4(gIn, x2, y4)) * gCoeffs[22]
66               + convert_float4(rsGetElementAt_uchar4(gIn, x3, y4)) * gCoeffs[23]
67               + convert_float4(rsGetElementAt_uchar4(gIn, x4, y4)) * gCoeffs[24];
68
69    return convert_uchar4(clamp(sum, 0.f, 255.f));
70}
71
72
73