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catmull-rom: make curves more rounded

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See https://github.com/Beep6581/RawTherapee/pull/4701#issuecomment-414054187
This commit is contained in:
Alberto Griggio 2018-08-18 15:11:54 +02:00
parent e3ea0926c2
commit 4b2392e44a
1 changed files with 11 additions and 1 deletions
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12
rtengine/diagonalcurves.cc
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@ -289,7 +289,8 @@ inline double catmull_rom_tj(double ti,
double xi, double yi,
double xj, double yj)
{
static constexpr double alpha = 0.5;
// see https://github.com/Beep6581/RawTherapee/pull/4701#issuecomment-414054187
static constexpr double alpha = 0.375;
return pow(sqrt(pow2(xj-xi) + pow2(yj-yi)), alpha) + ti;
}
@ -374,10 +375,19 @@ inline void catmull_rom_spline(int n_points,
inline void catmull_rom_reflect(double px, double py, double cx, double cy,
double &rx, double &ry)
{
#if 0
double dx = px - cx;
double dy = py - cy;
rx = cx - dx;
ry = cy - dy;
#else
// see https://github.com/Beep6581/RawTherapee/pull/4701#issuecomment-414054187
static constexpr double epsilon = 1e-5;
double dx = px - cx;
double dy = py - cy;
rx = cx - dx * 0.01;
ry = dx > epsilon ? (dy / dx) * (rx - cx) + cy : cy;
#endif
}