Vector
FXAA::filterPixel(int row, int col, const ScalarImagePtr &img) const
{
const Vector rgbNW = pixel(row-1, col-1, img);
const Vector rgbNE = pixel(row-1, col+1, img);
const Vector rgbSW = pixel(row+1, col-1, img);
const Vector rgbSE = pixel(row+1, col+1, img);
const Vector rgbM = pixel(row, col, img);
const Vector luma = Vector(Scalar(0.299), Scalar(0.587), Scalar(0.114));
Scalar lumaNW = rgbNW.dot(luma);
Scalar lumaNE = rgbNE.dot(luma);
Scalar lumaSW = rgbSW.dot(luma);
Scalar lumaSE = rgbSE.dot(luma);
Scalar lumaM = rgbM.dot(luma);
Scalar lumaMin = SMIN(lumaNW, SMIN(lumaNE, SMIN(lumaSW, SMIN(lumaSE, lumaM))));
Scalar lumaMax = SMAX(lumaNW, SMAX(lumaNE, SMAX(lumaSW, SMAX(lumaSE, lumaM))));
// FXAA params - fixed here for now.
const Scalar fxaa_reduce_mul = Scalar(1) / Scalar(32);
const Scalar fxaa_reduce_min = Scalar(1) / Scalar(128);
const Scalar fxaa_span_max = Scalar(8);
// Find direction and blur orthogonal to edge.
Vector2 dir;
dir.x() = -((lumaNW + lumaNE) - (lumaSW + lumaSE));
dir.y() = ((lumaNW + lumaSW) - (lumaNE + lumaSE));
Scalar dirRed = SMAX((lumaNW + lumaNE + lumaSW + lumaSE) * (Scalar(0.25) * fxaa_reduce_mul), fxaa_reduce_min);
Scalar invDirMin = Scalar(1) / (SMIN(abs(dir.x()), abs(dir.y())) + dirRed);
dir *= invDirMin;
dir.x() = clamp(dir.x(), -fxaa_span_max, fxaa_span_max);
dir.y() = clamp(dir.y(), -fxaa_span_max, fxaa_span_max);
const Scalar c = Scalar(1)/Scalar(3) - Scalar(0.5);
const Scalar d = Scalar(2)/Scalar(3) - Scalar(0.5);
const Scalar e = Scalar(0)/Scalar(3) - Scalar(0.5);
const Scalar f = Scalar(3)/Scalar(3) - Scalar(0.5);
Vector rgbA = Scalar(0.5) * (bilinearSample(row + c, col + c, img) + bilinearSample(row + d, col + d, img));
Vector rgbB = rgbA * Scalar(0.5) + Scalar(0.25) * (bilinearSample(row + e, col + e, img) + bilinearSample(row + f, col + f, img));
Scalar lumaB = rgbB.dot(luma);
if ((lumaB < lumaMin) || (lumaB > lumaMax)) {
return rgbA;
} else {
return rgbB;
}
}
void
fequinoxsolstice(int year, double UTCoffset, double *equinoxdays, double *solsticedays)
{
double dec, prevdec, L;
int h, d, prevangle, angle;
int found = 0;
double decleft, decright, decmiddle;
int dial, s;
int *cumdays;
cumdays = cumdaytab[isleap(year)];
/*
* Find the first equinox, somewhere in March:
* It happens when the returned value "dec" goes from
* [350 ... 360> -> [0 ... 10]
*/
for (d = 18; d < 31; d++) {
/* printf("Comparing day %d to %d.\n", d, d+1); */
sunpos(year, 3, d, UTCoffset, 0, 0, 0, 0.0, 0.0, &L, &decleft);
sunpos(year, 3, d + 1, UTCoffset, 0, 0, 0, 0.0, 0.0,
&L, &decright);
/* printf("Found %g and %g.\n", decleft, decright); */
if (SIGN(decleft) == SIGN(decright))
continue;
dial = SECSPERDAY;
s = SECSPERDAY / 2;
while (s > 0) {
/* printf("Obtaining %d (%02d:%02d)\n",
dial, SHOUR(dial), SMIN(dial)); */
sunpos(year, 3, d, UTCoffset,
SHOUR(dial), SMIN(dial), SSEC(dial),
0.0, 0.0, &L, &decmiddle);
/* printf("Found %g\n", decmiddle); */
if (SIGN(decleft) == SIGN(decmiddle)) {
decleft = decmiddle;
dial += s;
} else {
decright = decmiddle;
dial -= s;
}
/*
printf("New boundaries: %g - %g\n", decleft, decright);
*/
s /= 2;
}
equinoxdays[0] = 1 + cumdays[3] + d + (dial / FSECSPERDAY);
break;
}
/* Find the second equinox, somewhere in September:
* It happens when the returned value "dec" goes from
* [10 ... 0] -> <360 ... 350]
*/
for (d = 18; d < 31; d++) {
/* printf("Comparing day %d to %d.\n", d, d+1); */
sunpos(year, 9, d, UTCoffset, 0, 0, 0, 0.0, 0.0, &L, &decleft);
sunpos(year, 9, d + 1, UTCoffset, 0, 0, 0, 0.0, 0.0,
&L, &decright);
/* printf("Found %g and %g.\n", decleft, decright); */
if (SIGN(decleft) == SIGN(decright))
continue;
dial = SECSPERDAY;
s = SECSPERDAY / 2;
while (s > 0) {
/* printf("Obtaining %d (%02d:%02d)\n",
dial, SHOUR(dial), SMIN(dial)); */
sunpos(year, 9, d, UTCoffset,
SHOUR(dial), SMIN(dial), SSEC(dial),
0.0, 0.0, &L, &decmiddle);
/* printf("Found %g\n", decmiddle); */
if (SIGN(decleft) == SIGN(decmiddle)) {
decleft = decmiddle;
dial += s;
} else {
decright = decmiddle;
dial -= s;
}
/*
printf("New boundaries: %g - %g\n", decleft, decright);
*/
s /= 2;
}
equinoxdays[1] = 1 + cumdays[9] + d + (dial / FSECSPERDAY);
break;
}
/*
* Find the first solstice, somewhere in June:
* It happens when the returned value "dec" peaks
* [40 ... 45] -> [45 ... 40]
*/
found = 0;
prevdec = 0;
prevangle = 1;
for (d = 18; d < 31; d++) {
for (h = 0; h < 4 * HOURSPERDAY; h++) {
sunpos(year, 6, d, UTCoffset, HOUR(h), MIN(h), SEC(h),
0.0, 0.0, &L, &dec);
angle = ANGLE(prevdec, dec);
if (prevangle != angle) {
#ifdef NOTDEF
DEBUG2(year, 6, d, HOUR(h), MIN(h),
prevdec, dec, prevangle, angle);
#endif
solsticedays[0] = 1 + cumdays[6] + d +
((h / 4.0) / 24.0);
found = 1;
break;
}
prevdec = dec;
prevangle = angle;
}
if (found)
break;
}
/*
* Find the second solstice, somewhere in December:
* It happens when the returned value "dec" peaks
* [315 ... 310] -> [310 ... 315]
*/
found = 0;
prevdec = 360;
prevangle = -1;
for (d = 18; d < 31; d++) {
for (h = 0; h < 4 * HOURSPERDAY; h++) {
sunpos(year, 12, d, UTCoffset, HOUR(h), MIN(h), SEC(h),
0.0, 0.0, &L, &dec);
angle = ANGLE(prevdec, dec);
if (prevangle != angle) {
#ifdef NOTDEF
DEBUG2(year, 12, d, HOUR(h), MIN(h),
prevdec, dec, prevangle, angle);
#endif
solsticedays[1] = 1 + cumdays[12] + d +
((h / 4.0) / 24.0);
found = 1;
break;
}
prevdec = dec;
prevangle = angle;
}
if (found)
break;
}
return;
}