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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
#define DIG(a) a,
__constant float kx[] = { KERNEL_MATRIX_X };
__constant float ky[] = { KERNEL_MATRIX_Y };
#define OP(y, x) (convert_float4(arr[y * 5 + x]) * ky[y] * kx[x])
#define FILL_ARR(s1, s2, n, e1, e2) \
arr[5 * n + 0] = row_s ? (uchar4)(s1, s2, line[n].s23) : (uchar4)(line[n].s0123); \
arr[5 * n + 1] = row_s ? (uchar4)(s2, line[n].s234) : (uchar4)(line[n].s1234); \
arr[5 * n + 2] = (uchar4)(line[n].s2345); \
arr[5 * n + 3] = row_e ? (uchar4)(line[n].s345, e1) : (uchar4)(line[n].s3456); \
arr[5 * n + 4] = row_e ? (uchar4)(line[n].s45, e1, e2) : (uchar4)(line[n].s4567);
__kernel void gaussianBlur5x5_8UC1_cols4(__global const uchar* src, int src_step,
__global uint* dst, int dst_step, int rows, int cols)
{
int x = get_global_id(0) * 4;
int y = get_global_id(1);
if (x >= cols || y >= rows) return;
uchar8 line[5];
int offset, src_index;
src_index = x + (y - 2) * src_step - 2;
offset = max(0, src_index + 2 * src_step);
line[2] = vload8(0, src + offset);
if (offset == 0) line[2] = (uchar8)(0, 0, line[2].s0123, line[2].s45);
#if defined BORDER_CONSTANT || defined BORDER_REPLICATE
uchar8 tmp;
#ifdef BORDER_CONSTANT
tmp = (uchar8)0;
#elif defined BORDER_REPLICATE
tmp = line[2];
#endif
line[0] = line[1] = tmp;
if (y > 1)
{
offset = max(0, src_index);
line[0] = vload8(0, src + offset);
if (offset == 0) line[0] = (uchar8)(0, 0, line[0].s0123, line[0].s45);
}
if (y > 0)
{
offset = max(0, src_index + src_step);
line[1] = vload8(0, src + offset);
if (offset == 0) line[1] = (uchar8)(0, 0, line[1].s0123, line[1].s45);
}
line[3] = (y == (rows - 1)) ? tmp : vload8(0, src + src_index + 3 * src_step);
line[4] = (y >= (rows - 2)) ? tmp : vload8(0, src + src_index + 4 * src_step);
#elif BORDER_REFLECT
int t;
t = (y <= 1) ? (abs(y - 1) - y + 2) : 0;
offset = max(0, src_index + t * src_step);
line[0] = vload8(0, src + offset);
if (offset == 0) line[0] = (uchar8)(0, 0, line[0].s0123, line[0].s45);
if (y == 0)
line[1] = line[2];
else
{
offset = max(0, src_index + 1 * src_step);
line[1] = vload8(0, src + offset);
if (offset == 0) line[1] = (uchar8)(0, 0, line[1].s0123, line[0].s45);
}
line[3] = (y == (rows - 1)) ? line[2] : vload8(0, src + src_index + 3 * src_step);
t = (y >= (rows - 2)) ? (abs(y - (rows - 1)) - (y - (rows - 2)) + 2) : 4;
line[4] = vload8(0, src + src_index + t * src_step);
#elif BORDER_REFLECT_101
if (y == 1)
line[0] = line[2];
else
{
offset = (y == 0) ? (src_index + 4 * src_step) : max(0, src_index);
line[0] = vload8(0, src + offset);
if (offset == 0) line[0] = (uchar8)(0, 0, line[0].s0123, line[0].s45);
}
offset = (y == 0) ? (src_index + 3 * src_step) : max(0, src_index + 1 * src_step);
line[1] = vload8(0, src + offset);
if (offset == 0) line[1] = (uchar8)(0, 0, line[1].s0123, line[1].s45);
line[3] = vload8(0, src + src_index + ((y == (rows - 1)) ? 1 : 3) * src_step);
if (y == (rows - 2))
line[4] = line[2];
else
{
line[4] = vload8(0, src + src_index + ((y == (rows - 1)) ? 1 : 4) * src_step);
}
#endif
bool row_s = (x == 0);
bool row_e = ((x + 4) == cols);
uchar4 arr[25];
uchar s, e;
#ifdef BORDER_CONSTANT
s = e = 0;
FILL_ARR(s, s, 0, e, e);
FILL_ARR(s, s, 1, e, e);
FILL_ARR(s, s, 2, e, e);
FILL_ARR(s, s, 3, e, e);
FILL_ARR(s, s, 4, e, e);
#elif defined BORDER_REPLICATE
s = line[0].s2;
e = line[0].s5;
FILL_ARR(s, s, 0, e, e);
s = line[1].s2;
e = line[1].s5;
FILL_ARR(s, s, 1, e, e);
s = line[2].s2;
e = line[2].s5;
FILL_ARR(s, s, 2, e, e);
s = line[3].s2;
e = line[3].s5;
FILL_ARR(s, s, 3, e, e);
s = line[4].s2;
e = line[4].s5;
FILL_ARR(s, s, 4, e, e);
#elif BORDER_REFLECT
uchar s1, s2;
uchar e1, e2;
s1 = line[0].s3;
s2 = line[0].s2;
e1 = line[0].s5;
e2 = line[0].s4;
FILL_ARR(s1, s2, 0, e1, e2);
s1 = line[1].s3;
s2 = line[1].s2;
e1 = line[1].s5;
e2 = line[1].s4;
FILL_ARR(s1, s2, 1, e1, e2);
s1 = line[2].s3;
s2 = line[2].s2;
e1 = line[2].s5;
e2 = line[2].s4;
FILL_ARR(s1, s2, 2, e1, e2);
s1 = line[3].s3;
s2 = line[3].s2;
e1 = line[3].s5;
e2 = line[3].s4;
FILL_ARR(s1, s2, 3, e1, e2);
s1 = line[4].s3;
s2 = line[4].s2;
e1 = line[4].s5;
e2 = line[4].s4;
FILL_ARR(s1, s2, 4, e1, e2);
#elif BORDER_REFLECT_101
s = line[0].s4;
e = line[0].s3;
FILL_ARR(s, e, 0, s, e);
s = line[1].s4;
e = line[1].s3;
FILL_ARR(s, e, 1, s, e);
s = line[2].s4;
e = line[2].s3;
FILL_ARR(s, e, 2, s, e);
s = line[3].s4;
e = line[3].s3;
FILL_ARR(s, e, 3, s, e);
s = line[4].s4;
e = line[4].s3;
FILL_ARR(s, e, 4, s, e);
#endif
float4 sum;
sum = OP(0, 0) + OP(0, 1) + OP(0, 2) + OP(0, 3) + OP(0, 4) +
OP(1, 0) + OP(1, 1) + OP(1, 2) + OP(1, 3) + OP(1, 4) +
OP(2, 0) + OP(2, 1) + OP(2, 2) + OP(2, 3) + OP(2, 4) +
OP(3, 0) + OP(3, 1) + OP(3, 2) + OP(3, 3) + OP(3, 4) +
OP(4, 0) + OP(4, 1) + OP(4, 2) + OP(4, 3) + OP(4, 4);
int dst_index = (x / 4) + y * (dst_step / 4);
dst[dst_index] = as_uint(convert_uchar4_sat_rte(sum));
}