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/*
* Copyright 2011, Blender Foundation.
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Contributor:
* Jeroen Bakker
* Monique Dewanchand
*/
#include "COM_GlareGhostOperation.h"
#include "BLI_math.h"
#include "COM_FastGaussianBlurOperation.h"
static float smoothMask(float x, float y)
{
float t;
x = 2.f*x - 1.f, y = 2.f*y - 1.f;
if ((t = 1.f - sqrtf(x*x + y*y)) <= 0.f) return 0.f;
return t;
}
void GlareGhostOperation::generateGlare(float *data, MemoryBuffer *inputTile, NodeGlare *settings)
{
const int qt = 1 << settings->quality;
const float s1 = 4.f/(float)qt, s2 = 2.f*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.f - settings->colmod;
MemoryBuffer *gbuf = inputTile->duplicate();
MemoryBuffer *tbuf1 = inputTile->duplicate();
FastGaussianBlurOperation::IIR_gauss(tbuf1, s1, 0, 3);
FastGaussianBlurOperation::IIR_gauss(tbuf1, s1, 1, 3);
FastGaussianBlurOperation::IIR_gauss(tbuf1, s1, 2, 3);
MemoryBuffer *tbuf2 = tbuf1->duplicate();
FastGaussianBlurOperation::IIR_gauss(tbuf2, s2, 0, 3);
FastGaussianBlurOperation::IIR_gauss(tbuf2, s2, 1, 3);
FastGaussianBlurOperation::IIR_gauss(tbuf2, s2, 2, 3);
if (settings->iter & 1) ofs = 0.5f; else ofs = 0.f;
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.f, cmo, cmo);
if (y==2) fRGB_rgbmult(cm[x], cmo, cmo, 1.f);
if (y==3) fRGB_rgbmult(cm[x], cmo, 1.f, cmo);
scalef[x] = 2.1f*(1.f-(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->getHeight(); y++) {
v = (float)(y+0.5f) / (float)gbuf->getHeight();
for (x=0; x<gbuf->getWidth(); x++) {
u = (float)(x+0.5f) / (float)gbuf->getWidth();
s = (u-0.5f)*sc + 0.5f, t = (v-0.5f)*sc + 0.5f;
tbuf1->read(c, s*gbuf->getWidth(), t*gbuf->getHeight());
sm = smoothMask(s, t);
fRGB_mult(c, sm);
s = (u-0.5f)*isc + 0.5f, t = (v-0.5f)*isc + 0.5f;
tbuf2->read(tc, s*gbuf->getWidth()-0.5f, t*gbuf->getHeight()-0.5f);
sm = smoothMask(s, t);
fRGB_madd(c, tc, sm);
gbuf->writePixel(x, y, c);
}
}
memset(tbuf1->getBuffer(), 0, tbuf1->getWidth()*tbuf1->getHeight()*COM_NUMBER_OF_CHANNELS*sizeof(float));
for (n=1; n<settings->iter; n++) {
for (y=0; y<gbuf->getHeight(); y++) {
v = (float)(y+0.5f) / (float)gbuf->getHeight();
for (x=0; x<gbuf->getWidth(); x++) {
u = (float)(x+0.5f) / (float)gbuf->getWidth();
tc[0] = tc[1] = tc[2] = 0.f;
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(c, s*gbuf->getWidth() - 0.5f, t*gbuf->getHeight() - 0.5f);
fRGB_colormult(c, cm[np]);
sm = smoothMask(s, t)*0.25f;
fRGB_madd(tc, c, sm);
}
tbuf1->writePixel(x, y, tc);
}
}
memcpy(gbuf->getBuffer(), tbuf1->getBuffer(), tbuf1->getWidth()*tbuf1->getHeight()*COM_NUMBER_OF_CHANNELS*sizeof(float));
}
memcpy(data, gbuf->getBuffer(), gbuf->getWidth()*gbuf->getHeight()*COM_NUMBER_OF_CHANNELS*sizeof(float));
delete gbuf;
delete tbuf1;
delete tbuf2;
}
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