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/*
* Copyright (c) 2011 Pascal Getreuer
* Copyright (c) 2016 Paul B Mahol
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef AVFILTER_GBLUR_INIT_H
#define AVFILTER_GBLUR_INIT_H
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "gblur.h"
static void postscale_c(float *buffer, int length,
float postscale, float min, float max)
{
for (int i = 0; i < length; i++) {
buffer[i] *= postscale;
buffer[i] = av_clipf(buffer[i], min, max);
}
}
static void horiz_slice_c(float *buffer, int width, int height, int steps,
float nu, float bscale, float *localbuf)
{
int x;
for (int y = 0; y < height; y++) {
for (int step = 0; step < steps; step++) {
float *ptr = buffer + width * y;
ptr[0] *= bscale;
/* Filter rightwards */
for (x = 1; x < width; x++)
ptr[x] += nu * ptr[x - 1];
ptr[x = width - 1] *= bscale;
/* Filter leftwards */
for (; x > 0; x--)
ptr[x - 1] += nu * ptr[x];
}
}
}
static void do_vertical_columns(float *buffer, int width, int height,
int column_begin, int column_end, int steps,
float nu, float boundaryscale, int column_step)
{
const int numpixels = width * height;
int i;
for (int x = column_begin; x < column_end;) {
for (int step = 0; step < steps; step++) {
float *ptr = buffer + x;
for (int k = 0; k < column_step; k++) {
ptr[k] *= boundaryscale;
}
/* Filter downwards */
for (i = width; i < numpixels; i += width) {
for (int k = 0; k < column_step; k++) {
ptr[i + k] += nu * ptr[i - width + k];
}
}
i = numpixels - width;
for (int k = 0; k < column_step; k++)
ptr[i + k] *= boundaryscale;
/* Filter upwards */
for (; i > 0; i -= width) {
for (int k = 0; k < column_step; k++)
ptr[i - width + k] += nu * ptr[i + k];
}
}
x += column_step;
}
}
static void verti_slice_c(float *buffer, int width, int height,
int slice_start, int slice_end, int steps,
float nu, float boundaryscale)
{
int aligned_end = slice_start + (((slice_end - slice_start) >> 3) << 3);
/* Filter vertically along columns (process 8 columns in each step) */
do_vertical_columns(buffer, width, height, slice_start, aligned_end,
steps, nu, boundaryscale, 8);
/* Filter un-aligned columns one by one */
do_vertical_columns(buffer, width, height, aligned_end, slice_end,
steps, nu, boundaryscale, 1);
}
static av_unused void ff_gblur_init(GBlurContext *s)
{
s->localbuf = NULL;
s->horiz_slice = horiz_slice_c;
s->verti_slice = verti_slice_c;
s->postscale_slice = postscale_c;
#if ARCH_X86
ff_gblur_init_x86(s);
#endif
}
#endif /* AVFILTER_GBLUR_INIT_H */
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