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/*
* Copyright (c) 2018 Danil Iashchenko
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
__kernel void erosion_global(__write_only image2d_t dst,
__read_only image2d_t src,
float threshold,
__constant int *coord)
{
const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
CLK_ADDRESS_CLAMP_TO_EDGE |
CLK_FILTER_NEAREST);
int2 loc = (int2)(get_global_id(0), get_global_id(1));
float4 px = read_imagef(src, sampler, loc);
float limit = px.x - threshold;
if (limit < 0) {
limit = 0;
}
for (int i = -1; i <= 1; i++) {
for (int j = -1; j <= 1; j++) {
if (coord[(j + 1) * 3 + (i + 1)] == 1) {
float4 cur = read_imagef(src, sampler, loc + (int2)(i, j));
if (cur.x < px.x) {
px = cur;
}
}
}
}
if (limit > px.x) {
px = (float4)(limit);
}
write_imagef(dst, loc, px);
}
__kernel void dilation_global(__write_only image2d_t dst,
__read_only image2d_t src,
float threshold,
__constant int *coord)
{
const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
CLK_ADDRESS_CLAMP_TO_EDGE |
CLK_FILTER_NEAREST);
int2 loc = (int2)(get_global_id(0), get_global_id(1));
float4 px = read_imagef(src, sampler, loc);
float limit = px.x + threshold;
if (limit > 1) {
limit = 1;
}
for (int i = -1; i <= 1; i++) {
for (int j = -1; j <= 1; j++) {
if (coord[(j + 1) * 3 + (i + 1)] == 1) {
float4 cur = read_imagef(src, sampler, loc + (int2)(i, j));
if (cur.x > px.x) {
px = cur;
}
}
}
}
if (limit < px.x) {
px = (float4)(limit);
}
write_imagef(dst, loc, px);
}
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