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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2011 Blender Foundation. */
#include "COM_GlareStreaksOperation.h"
namespace blender::compositor {
void GlareStreaksOperation::generate_glare(float *data,
MemoryBuffer *input_tile,
NodeGlare *settings)
{
int x, y, n;
unsigned int nump = 0;
float c1[4], c2[4], c3[4], c4[4];
float a, ang = DEG2RADF(360.0f) / (float)settings->streaks;
int size = input_tile->get_width() * input_tile->get_height();
int size4 = size * 4;
bool breaked = false;
MemoryBuffer tsrc(*input_tile);
MemoryBuffer tdst(DataType::Color, input_tile->get_rect());
tdst.clear();
memset(data, 0, size4 * sizeof(float));
for (a = 0.0f; a < DEG2RADF(360.0f) && (!breaked); a += ang) {
const float an = a + settings->angle_ofs;
const float vx = cos((double)an), vy = sin((double)an);
for (n = 0; n < settings->iter && (!breaked); n++) {
const float p4 = pow(4.0, (double)n);
const float vxp = vx * p4, vyp = vy * p4;
const float wt = pow((double)settings->fade, (double)p4);
/* Color-modulation amount relative to current pass. */
const float cmo = 1.0f - (float)pow((double)settings->colmod, (double)n + 1);
float *tdstcol = tdst.get_buffer();
for (y = 0; y < tsrc.get_height() && (!breaked); y++) {
for (x = 0; x < tsrc.get_width(); x++, tdstcol += 4) {
/* First pass no offset, always same for every pass, exact copy,
* otherwise results in uneven brightness, only need once. */
if (n == 0) {
tsrc.read(c1, x, y);
}
else {
c1[0] = c1[1] = c1[2] = 0;
}
tsrc.read_bilinear(c2, x + vxp, y + vyp);
tsrc.read_bilinear(c3, x + vxp * 2.0f, y + vyp * 2.0f);
tsrc.read_bilinear(c4, x + vxp * 3.0f, y + vyp * 3.0f);
/* Modulate color to look vaguely similar to a color spectrum. */
c2[1] *= cmo;
c2[2] *= cmo;
c3[0] *= cmo;
c3[1] *= cmo;
c4[0] *= cmo;
c4[2] *= cmo;
tdstcol[0] = 0.5f * (tdstcol[0] + c1[0] + wt * (c2[0] + wt * (c3[0] + wt * c4[0])));
tdstcol[1] = 0.5f * (tdstcol[1] + c1[1] + wt * (c2[1] + wt * (c3[1] + wt * c4[1])));
tdstcol[2] = 0.5f * (tdstcol[2] + c1[2] + wt * (c2[2] + wt * (c3[2] + wt * c4[2])));
tdstcol[3] = 1.0f;
}
if (is_braked()) {
breaked = true;
}
}
memcpy(tsrc.get_buffer(), tdst.get_buffer(), sizeof(float) * size4);
}
float *sourcebuffer = tsrc.get_buffer();
float factor = 1.0f / (float)(6 - settings->iter);
for (int i = 0; i < size4; i += 4) {
madd_v3_v3fl(&data[i], &sourcebuffer[i], factor);
data[i + 3] = 1.0f;
}
tdst.clear();
memcpy(tsrc.get_buffer(), input_tile->get_buffer(), sizeof(float) * size4);
nump++;
}
}
} // namespace blender::compositor
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