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.rs.image)
19#pragma rs_fp_relaxed
20
21int32_t gWidth;
22int32_t gHeight;
23rs_allocation gIn;
24
25float gCoeffs[25];
26
27uchar4 __attribute__((kernel)) root(uint32_t x, uint32_t y) {
28    uint32_t x0 = max((int32_t)x-2, 0);
29    uint32_t x1 = max((int32_t)x-1, 0);
30    uint32_t x2 = x;
31    uint32_t x3 = min((int32_t)x+1, gWidth-1);
32    uint32_t x4 = min((int32_t)x+2, gWidth-1);
33
34    uint32_t y0 = max((int32_t)y-2, 0);
35    uint32_t y1 = max((int32_t)y-1, 0);
36    uint32_t y2 = y;
37    uint32_t y3 = min((int32_t)y+1, gHeight-1);
38    uint32_t y4 = min((int32_t)y+2, gHeight-1);
39
40    float4 p0 = convert_float4(rsGetElementAt_uchar4(gIn, x0, y0)) * gCoeffs[0]
41              + convert_float4(rsGetElementAt_uchar4(gIn, x1, y0)) * gCoeffs[1]
42              + convert_float4(rsGetElementAt_uchar4(gIn, x2, y0)) * gCoeffs[2]
43              + convert_float4(rsGetElementAt_uchar4(gIn, x3, y0)) * gCoeffs[3]
44              + convert_float4(rsGetElementAt_uchar4(gIn, x4, y0)) * gCoeffs[4];
45
46    float4 p1 = convert_float4(rsGetElementAt_uchar4(gIn, x0, y1)) * gCoeffs[5]
47              + convert_float4(rsGetElementAt_uchar4(gIn, x1, y1)) * gCoeffs[6]
48              + convert_float4(rsGetElementAt_uchar4(gIn, x2, y1)) * gCoeffs[7]
49              + convert_float4(rsGetElementAt_uchar4(gIn, x3, y1)) * gCoeffs[8]
50              + convert_float4(rsGetElementAt_uchar4(gIn, x4, y1)) * gCoeffs[9];
51
52    float4 p2 = convert_float4(rsGetElementAt_uchar4(gIn, x0, y2)) * gCoeffs[10]
53              + convert_float4(rsGetElementAt_uchar4(gIn, x1, y2)) * gCoeffs[11]
54              + convert_float4(rsGetElementAt_uchar4(gIn, x2, y2)) * gCoeffs[12]
55              + convert_float4(rsGetElementAt_uchar4(gIn, x3, y2)) * gCoeffs[13]
56              + convert_float4(rsGetElementAt_uchar4(gIn, x4, y2)) * gCoeffs[14];
57
58    float4 p3 = convert_float4(rsGetElementAt_uchar4(gIn, x0, y3)) * gCoeffs[15]
59              + convert_float4(rsGetElementAt_uchar4(gIn, x1, y3)) * gCoeffs[16]
60              + convert_float4(rsGetElementAt_uchar4(gIn, x2, y3)) * gCoeffs[17]
61              + convert_float4(rsGetElementAt_uchar4(gIn, x3, y3)) * gCoeffs[18]
62              + convert_float4(rsGetElementAt_uchar4(gIn, x4, y3)) * gCoeffs[19];
63
64    float4 p4 = convert_float4(rsGetElementAt_uchar4(gIn, x0, y4)) * gCoeffs[20]
65              + convert_float4(rsGetElementAt_uchar4(gIn, x1, y4)) * gCoeffs[21]
66              + convert_float4(rsGetElementAt_uchar4(gIn, x2, y4)) * gCoeffs[22]
67              + convert_float4(rsGetElementAt_uchar4(gIn, x3, y4)) * gCoeffs[23]
68              + convert_float4(rsGetElementAt_uchar4(gIn, x4, y4)) * gCoeffs[24];
69
70    p0 = clamp(p0 + p1 + p2 + p3 + p4, 0.f, 255.f);
71    return convert_uchar4(p0);
72}
73
74
75