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/*
This file is part of darktable,
copyright (c) 2011 ulrich pegelow.
darktable is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
darktable 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with darktable. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
/* This is highpass for Lab space. We only do invert/blur/mix on L and desaturate a and b */
kernel void
highpass_invert(read_only image2d_t in, write_only image2d_t out, const int width, const int height)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
if(x >= width || y >= height) return;
float4 pixel = read_imagef(in, sampleri, (int2)(x, y));
pixel.x = clamp(100.0f - pixel.x, 0.0f, 100.0f);
write_imagef (out, (int2)(x, y), pixel);
}
kernel void
highpass_hblur(read_only image2d_t in, write_only image2d_t out, global float *m, const int rad,
const int width, const int height, const int blocksize, local float *buffer)
{
const int lid = get_local_id(0);
const int lsz = get_local_size(0);
const int x = get_global_id(0);
const int y = get_global_id(1);
float4 pixel = (float4)0.0f;
/* read pixel and fill center part of buffer */
pixel = read_imagef(in, sampleri, (int2)(x, y));
buffer[rad + lid] = pixel.x;
/* left wing of buffer */
for(int n=0; n <= rad/lsz; n++)
{
const int l = mad24(n, lsz, lid + 1);
if(l > rad) continue;
const int xx = mad24((int)get_group_id(0), lsz, -l);
buffer[rad - l] = read_imagef(in, sampleri, (int2)(xx, y)).x;
}
/* right wing of buffer */
for(int n=0; n <= rad/lsz; n++)
{
const int r = mad24(n, lsz, lsz - lid);
if(r > rad) continue;
const int xx = mad24((int)get_group_id(0), lsz, lsz - 1 + r);
buffer[rad + lsz - 1 + r] = read_imagef(in, sampleri, (int2)(xx, y)).x;
}
barrier(CLK_LOCAL_MEM_FENCE);
if(x >= width || y >= height) return;
buffer += lid + rad;
m += rad;
float sum = 0.0f;
for (int i=-rad; i<=rad; i++)
{
sum += buffer[i] * m[i];
}
pixel.x = sum;
write_imagef (out, (int2)(x, y), pixel);
}
kernel void
highpass_vblur(read_only image2d_t in, write_only image2d_t out, global float *m, const int rad,
const int width, const int height, const int blocksize, local float *buffer)
{
const int lid = get_local_id(1);
const int lsz = get_local_size(1);
const int x = get_global_id(0);
const int y = get_global_id(1);
float4 pixel = (float4)0.0f;
/* read pixel and fill center part of buffer */
pixel = read_imagef(in, sampleri, (int2)(x, y));
buffer[rad + lid] = pixel.x;
/* left wing of buffer */
for(int n=0; n <= rad/lsz; n++)
{
const int l = mad24(n, lsz, lid + 1);
if(l > rad) continue;
const int yy = mad24((int)get_group_id(1), lsz, -l);
buffer[rad - l] = read_imagef(in, sampleri, (int2)(x, yy)).x;
}
/* right wing of buffer */
for(int n=0; n <= rad/lsz; n++)
{
const int r = mad24(n, lsz, lsz - lid);
if(r > rad) continue;
const int yy = mad24((int)get_group_id(1), lsz, lsz - 1 + r);
buffer[rad + lsz - 1 + r] = read_imagef(in, sampleri, (int2)(x, yy)).x;
}
barrier(CLK_LOCAL_MEM_FENCE);
if(x >= width || y >= height) return;
buffer += lid + rad;
m += rad;
float sum = 0.0f;
for (int i=-rad; i<=rad; i++)
{
sum += buffer[i] * m[i];
}
pixel.x = sum;
write_imagef (out, (int2)(x, y), pixel);
}
kernel void
highpass_mix(read_only image2d_t in_a, read_only image2d_t in_b, write_only image2d_t out,
const int width, const int height, const float contrast_scale)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
if(x >= width || y >= height) return;
float4 o = 0.0f;
float4 a = read_imagef(in_a, sampleri, (int2)(x, y));
float4 b = read_imagef(in_b, sampleri, (int2)(x, y));
float4 min = (float4)(0.0f, -128.0f, -128.0f, -INFINITY);
float4 max = (float4)(100.0f, 128.0f, 128.0f, INFINITY);
o.x = 50.0f+((0.5f * a.x + 0.5f * b.x) - 50.0f)*contrast_scale;
o.y = 0.0f;
o.z = 0.0f;
o.w = a.w;
write_imagef (out, (int2)(x, y), clamp(o, min, max));
}
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