76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
/*
|
|
* This file is part of RawTherapee.
|
|
*
|
|
* Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
|
|
*
|
|
* RawTherapee 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 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* RawTherapee 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 RawTherapee. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#define A (-0.85)
|
|
//#define CLIP(a) ((a>CMAXVAL)?a=CMAXVAL:((a<0)?0:a))
|
|
|
|
inline void cubint (Image16* src, int xs, int ys, double Dx, double Dy, unsigned short *r, unsigned short *g, unsigned short *b, double mul) {
|
|
|
|
register double w[4];
|
|
|
|
{ register double t1, t2;
|
|
t1 = -A*(Dx-1.0)*Dx;
|
|
t2 = (3.0-2.0*Dx)*Dx*Dx;
|
|
w[3] = t1*Dx;
|
|
w[2] = t1*(Dx-1.0) + t2;
|
|
w[1] = -t1*Dx + 1.0 - t2;
|
|
w[0] = -t1*(Dx-1.0);
|
|
}
|
|
|
|
register double rd, gd, bd;
|
|
double yr[4], yg[4], yb[4];
|
|
|
|
for (int k=ys, kx=0; k<ys+4; k++, kx++) {
|
|
rd = gd = bd = 0.0;
|
|
for (int i=xs, ix=0; i<xs+4; i++, ix++) {
|
|
rd += src->r[k][i] * w[ix];
|
|
gd += src->g[k][i] * w[ix];
|
|
bd += src->b[k][i] * w[ix];
|
|
}
|
|
yr[kx] = rd; yg[kx] = gd; yb[kx] = bd;
|
|
}
|
|
|
|
|
|
{ register double t1, t2;
|
|
t1 = -A*(Dy-1.0)*Dy;
|
|
t2 = (3.0-2.0*Dy)*Dy*Dy;
|
|
w[3] = t1*Dy;
|
|
w[2] = t1*(Dy-1.0) + t2;
|
|
w[1] = -t1*Dy + 1.0 - t2;
|
|
w[0] = -t1*(Dy-1.0);
|
|
}
|
|
|
|
rd = gd = bd = 0.0;
|
|
for (int i=0; i<4; i++) {
|
|
rd += yr[i] * w[i];
|
|
gd += yg[i] * w[i];
|
|
bd += yb[i] * w[i];
|
|
}
|
|
|
|
rd*=mul;
|
|
gd*=mul;
|
|
bd*=mul;
|
|
|
|
*r = (int)CLIP(rd);
|
|
*g = (int)CLIP(gd);
|
|
*b = (int)CLIP(bd);
|
|
|
|
// if (xs==100 && ys==100)
|
|
// printf ("r=%g, g=%g\n", *r, *g);
|
|
}
|