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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2011 Blender Foundation. */
#include "COM_GlareSimpleStarOperation.h"
namespace blender::compositor {
void GlareSimpleStarOperation::generate_glare(float *data,
MemoryBuffer *input_tile,
NodeGlare *settings)
{
int i, x, y, ym, yp, xm, xp;
float c[4] = {0, 0, 0, 0}, tc[4] = {0, 0, 0, 0};
const float f1 = 1.0f - settings->fade;
const float f2 = (1.0f - f1) * 0.5f;
MemoryBuffer tbuf1(*input_tile);
MemoryBuffer tbuf2(*input_tile);
bool breaked = false;
for (i = 0; i < settings->iter && (!breaked); i++) {
// // (x || x-1, y-1) to (x || x+1, y+1)
// // F
for (y = 0; y < this->get_height() && (!breaked); y++) {
ym = y - i;
yp = y + i;
for (x = 0; x < this->get_width(); x++) {
xm = x - i;
xp = x + i;
tbuf1.read(c, x, y);
mul_v3_fl(c, f1);
tbuf1.read(tc, (settings->star_45 ? xm : x), ym);
madd_v3_v3fl(c, tc, f2);
tbuf1.read(tc, (settings->star_45 ? xp : x), yp);
madd_v3_v3fl(c, tc, f2);
c[3] = 1.0f;
tbuf1.write_pixel(x, y, c);
tbuf2.read(c, x, y);
mul_v3_fl(c, f1);
tbuf2.read(tc, xm, (settings->star_45 ? yp : y));
madd_v3_v3fl(c, tc, f2);
tbuf2.read(tc, xp, (settings->star_45 ? ym : y));
madd_v3_v3fl(c, tc, f2);
c[3] = 1.0f;
tbuf2.write_pixel(x, y, c);
}
if (is_braked()) {
breaked = true;
}
}
// // B
for (y = this->get_height() - 1; y >= 0 && (!breaked); y--) {
ym = y - i;
yp = y + i;
for (x = this->get_width() - 1; x >= 0; x--) {
xm = x - i;
xp = x + i;
tbuf1.read(c, x, y);
mul_v3_fl(c, f1);
tbuf1.read(tc, (settings->star_45 ? xm : x), ym);
madd_v3_v3fl(c, tc, f2);
tbuf1.read(tc, (settings->star_45 ? xp : x), yp);
madd_v3_v3fl(c, tc, f2);
c[3] = 1.0f;
tbuf1.write_pixel(x, y, c);
tbuf2.read(c, x, y);
mul_v3_fl(c, f1);
tbuf2.read(tc, xm, (settings->star_45 ? yp : y));
madd_v3_v3fl(c, tc, f2);
tbuf2.read(tc, xp, (settings->star_45 ? ym : y));
madd_v3_v3fl(c, tc, f2);
c[3] = 1.0f;
tbuf2.write_pixel(x, y, c);
}
if (is_braked()) {
breaked = true;
}
}
}
for (i = 0; i < this->get_width() * this->get_height() * 4; i++) {
data[i] = tbuf1.get_buffer()[i] + tbuf2.get_buffer()[i];
}
}
} // namespace blender::compositor
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