static inline float
_qtcGradientGetValue(float *gradient, size_t size, float distance)
{
if (distance < 0 || distance > size - 1) {
return 0;
}
int index = floorf(distance);
if (qtcEqual(index, distance)) {
return gradient[index];
}
return (gradient[index] * (index + 1 - distance) +
gradient[index + 1] * (distance - index));
}
void qtcShade(const Options *opts, const color *ca, color *cb, double k)
#endif
{
if(qtcEqual(k, 1.0))
{
#ifdef __cplusplus
*cb=ca;
#else
cb->red = ca->red;
cb->green = ca->green;
cb->blue = ca->blue;
#endif
}
else
switch(opts->shading)
{
case SHADING_SIMPLE:
{
#ifdef __cplusplus
int v=(int)(255.0*(k-1.0));
cb->setRgb(qtcLimit(ca.red()+v), qtcLimit(ca.green()+v), qtcLimit(ca.blue()+v));
#else
double v=65535.0*(k-1.0);
cb->red = qtcLimit(ca->red+v);
cb->green = qtcLimit(ca->green+v);
cb->blue = qtcLimit(ca->blue+v);
#endif
break;
}
case SHADING_HSL:
{
#ifdef __cplusplus
double r(ca.red()/255.0),
g(ca.green()/255.0),
b(ca.blue()/255.0);
#else
double r=ca->red/65535.0,
g=ca->green/65535.0,
b=ca->blue/65535.0;
#endif
double h, s, l;
rgbToHsl(r, g, b, &h, &s, &l);
l=normalize(l*k);
s=normalize(s*k);
hslToRgb(h, s, l, &r, &g, &b);
#ifdef __cplusplus
cb->setRgb(qtcLimit(r*255.0), qtcLimit(g*255.0), qtcLimit(b*255.0));
#else
cb->red=qtcLimit(r*65535.0);
cb->green=qtcLimit(g*65535.0);
cb->blue=qtcLimit(b*65535.0);
#endif
break;
}
case SHADING_HSV:
{
#ifdef __cplusplus
double r(ca.red()/255.0),
g(ca.green()/255.0),
b(ca.blue()/255.0);
#else
double r=ca->red/65535.0,
g=ca->green/65535.0,
b=ca->blue/65535.0;
#endif
double h, s, v;
qtcRgbToHsv(r, g, b, &h, &s, &v);
v*=k;
if (v > 1.0)
{
s -= v - 1.0;
if (s < 0)
s = 0;
v = 1.0;
}
qtcHsvToRgb(&r, &g, &b, h, s, v);
#ifdef __cplusplus
cb->setRgb(qtcLimit(r*255.0), qtcLimit(g*255.0), qtcLimit(b*255.0));
#else
cb->red=qtcLimit(r*65535.0);
cb->green=qtcLimit(g*65535.0);
cb->blue=qtcLimit(b*65535.0);
#endif
break;
}
case SHADING_HCY:
{
#define HCY_FACTOR 0.15
#if defined QT_VERSION && (QT_VERSION >= 0x040000) && defined QTC_QT4_ENABLE_KDE
if(k>1.0)
*cb=KColorUtils::lighten(ca, (k*(1+HCY_FACTOR))-1.0, 1.0);
else
*cb=KColorUtils::darken(ca, 1.0-(k*(1-HCY_FACTOR)), 1.0);
#elif defined __cplusplus
if(k>1.0)
*cb=ColorUtils_lighten(&ca, (k*(1+HCY_FACTOR))-1.0, 1.0);
else
*cb=ColorUtils_darken(&ca, 1.0-(k*(1-HCY_FACTOR)), 1.0);
#else
if(k>1.0)
*cb=ColorUtils_lighten(ca, (k*(1+HCY_FACTOR))-1.0, 1.0);
else
*cb=ColorUtils_darken(ca, 1.0-(k*(1-HCY_FACTOR)), 1.0);
#endif
}
}
#if defined __cplusplus && defined QT_VERSION && (QT_VERSION >= 0x040000)
cb->setAlpha(ca.alpha());
#endif
#ifndef __cplusplus
cb->pixel = ca->pixel;
#endif
}
