static inline QRgb blendShade( QRgb v, QRgb s )
{
//shadow image is already reduced and blurred
int as = qAlpha(s);
int av = qAlpha(v);
if ( as == 0 || av == 255 )
return v;
int a = as + av -(as*av)/255;
int r = blendComponent( qRed(v),av, qRed(s), as)/a;
int g = blendComponent( qGreen(v),av, qGreen(s), as)/a;
int b = blendComponent( qBlue(v),av, qBlue(s), as)/a;
return qRgba(r,g,b,a);
}
static inline QRgb blendShade( QRgb v, QRgb s )
{
//pick a number: shadow is 1/3 of object
int as = qAlpha(s)/3;
int av = qAlpha(v);
if ( as == 0 || av == 255 )
return v;
int a = as + av -(as*av)/255;
int r = blendComponent( qRed(v),av, qRed(s), as)/a;
int g = blendComponent( qGreen(v),av, qGreen(s), as)/a;
int b = blendComponent( qBlue(v),av, qBlue(s), as)/a;
return qRgba(r,g,b,a);
}
Color Color::blendWithWhite() const
{
// If the color contains alpha already, we leave it alone.
if (hasAlpha())
return *this;
Color newColor;
for (int alpha = cStartAlpha; alpha <= cEndAlpha; alpha += cAlphaIncrement) {
// We have a solid color. Convert to an equivalent color that looks the same when blended with white
// at the current alpha. Try using less transparency if the numbers end up being negative.
int r = blendComponent(red(), alpha);
int g = blendComponent(green(), alpha);
int b = blendComponent(blue(), alpha);
newColor = Color(r, g, b, alpha);
if (r >= 0 && g >= 0 && b >= 0)
break;
}
return newColor;
}