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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2011 Blender Foundation. */
#include "COM_GlareGhostOperation.h"
#include "COM_FastGaussianBlurOperation.h"
namespace blender::compositor {
static float smooth_mask(float x, float y)
{
float t;
x = 2.0f * x - 1.0f;
y = 2.0f * y - 1.0f;
if ((t = 1.0f - sqrtf(x * x + y * y)) > 0.0f) {
return t;
}
return 0.0f;
}
void GlareGhostOperation::generate_glare(float *data,
MemoryBuffer *input_tile,
NodeGlare *settings)
{
const int qt = 1 << settings->quality;
const float s1 = 4.0f / (float)qt, s2 = 2.0f * s1;
int x, y, n, p, np;
fRGB c, tc, cm[64];
float sc, isc, u, v, sm, s, t, ofs, scalef[64];
const float cmo = 1.0f - settings->colmod;
MemoryBuffer gbuf(*input_tile);
MemoryBuffer tbuf1(*input_tile);
bool breaked = false;
FastGaussianBlurOperation::IIR_gauss(&tbuf1, s1, 0, 3);
if (!breaked) {
FastGaussianBlurOperation::IIR_gauss(&tbuf1, s1, 1, 3);
}
if (is_braked()) {
breaked = true;
}
if (!breaked) {
FastGaussianBlurOperation::IIR_gauss(&tbuf1, s1, 2, 3);
}
MemoryBuffer tbuf2(tbuf1);
if (is_braked()) {
breaked = true;
}
if (!breaked) {
FastGaussianBlurOperation::IIR_gauss(&tbuf2, s2, 0, 3);
}
if (is_braked()) {
breaked = true;
}
if (!breaked) {
FastGaussianBlurOperation::IIR_gauss(&tbuf2, s2, 1, 3);
}
if (is_braked()) {
breaked = true;
}
if (!breaked) {
FastGaussianBlurOperation::IIR_gauss(&tbuf2, s2, 2, 3);
}
ofs = (settings->iter & 1) ? 0.5f : 0.0f;
for (x = 0; x < (settings->iter * 4); x++) {
y = x & 3;
cm[x][0] = cm[x][1] = cm[x][2] = 1;
if (y == 1) {
fRGB_rgbmult(cm[x], 1.0f, cmo, cmo);
}
if (y == 2) {
fRGB_rgbmult(cm[x], cmo, cmo, 1.0f);
}
if (y == 3) {
fRGB_rgbmult(cm[x], cmo, 1.0f, cmo);
}
scalef[x] = 2.1f * (1.0f - (x + ofs) / (float)(settings->iter * 4));
if (x & 1) {
scalef[x] = -0.99f / scalef[x];
}
}
sc = 2.13;
isc = -0.97;
for (y = 0; y < gbuf.get_height() && (!breaked); y++) {
v = ((float)y + 0.5f) / (float)gbuf.get_height();
for (x = 0; x < gbuf.get_width(); x++) {
u = ((float)x + 0.5f) / (float)gbuf.get_width();
s = (u - 0.5f) * sc + 0.5f;
t = (v - 0.5f) * sc + 0.5f;
tbuf1.read_bilinear(c, s * gbuf.get_width(), t * gbuf.get_height());
sm = smooth_mask(s, t);
mul_v3_fl(c, sm);
s = (u - 0.5f) * isc + 0.5f;
t = (v - 0.5f) * isc + 0.5f;
tbuf2.read_bilinear(tc, s * gbuf.get_width() - 0.5f, t * gbuf.get_height() - 0.5f);
sm = smooth_mask(s, t);
madd_v3_v3fl(c, tc, sm);
gbuf.write_pixel(x, y, c);
}
if (is_braked()) {
breaked = true;
}
}
memset(tbuf1.get_buffer(),
0,
tbuf1.get_width() * tbuf1.get_height() * COM_DATA_TYPE_COLOR_CHANNELS * sizeof(float));
for (n = 1; n < settings->iter && (!breaked); n++) {
for (y = 0; y < gbuf.get_height() && (!breaked); y++) {
v = ((float)y + 0.5f) / (float)gbuf.get_height();
for (x = 0; x < gbuf.get_width(); x++) {
u = ((float)x + 0.5f) / (float)gbuf.get_width();
tc[0] = tc[1] = tc[2] = 0.0f;
for (p = 0; p < 4; p++) {
np = (n << 2) + p;
s = (u - 0.5f) * scalef[np] + 0.5f;
t = (v - 0.5f) * scalef[np] + 0.5f;
gbuf.read_bilinear(c, s * gbuf.get_width() - 0.5f, t * gbuf.get_height() - 0.5f);
mul_v3_v3(c, cm[np]);
sm = smooth_mask(s, t) * 0.25f;
madd_v3_v3fl(tc, c, sm);
}
tbuf1.add_pixel(x, y, tc);
}
if (is_braked()) {
breaked = true;
}
}
memcpy(gbuf.get_buffer(),
tbuf1.get_buffer(),
tbuf1.get_width() * tbuf1.get_height() * COM_DATA_TYPE_COLOR_CHANNELS * sizeof(float));
}
memcpy(data,
gbuf.get_buffer(),
gbuf.get_width() * gbuf.get_height() * COM_DATA_TYPE_COLOR_CHANNELS * sizeof(float));
}
} // namespace blender::compositor
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