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/* This file is an image processing operation for GEGL
*
* GEGL 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 3 of the License, or (at your option) any later version.
*
* GEGL 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 GEGL; if not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2013 Victor Oliveira <victormatheus@gmail.com>
* Copyright 2013 Téo Mazars <teomazars@gmail.com>
*/
__kernel void fir_ver_blur(const global float4 *src_buf,
global float4 *dst_buf,
const global float *cmatrix,
const int clen)
{
const int gidx = get_global_id (0);
const int gidy = get_global_id (1);
const int src_rowstride = get_global_size (0);
const int dst_rowstride = get_global_size (0);
const int half_clen = clen / 2;
const int src_offset = gidx + (gidy + half_clen) * src_rowstride;
const int dst_offset = gidx + gidy * dst_rowstride;
const int src_start_ind = src_offset - half_clen * src_rowstride;
float4 v = 0.0f;
for (int i = 0; i < clen; i++)
{
v += src_buf[src_start_ind + i * src_rowstride] * cmatrix[i];
}
dst_buf[dst_offset] = v;
}
__kernel void fir_hor_blur(const global float4 *src_buf,
global float4 *dst_buf,
const global float *cmatrix,
const int clen)
{
const int gidx = get_global_id (0);
const int gidy = get_global_id (1);
const int src_rowstride = get_global_size (0) + clen - 1; /*== 2*(clen/2) */
const int dst_rowstride = get_global_size (0);
const int half_clen = clen / 2;
const int src_offset = gidx + gidy * src_rowstride + half_clen;
const int dst_offset = gidx + gidy * dst_rowstride;
const int src_start_ind = src_offset - half_clen;
float4 v = 0.0f;
for (int i = 0; i < clen; i++)
{
v += src_buf[src_start_ind + i] * cmatrix[i];
}
dst_buf[dst_offset] = v;
}
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