void operator()(const P1& src, P2& dst) const {
typedef typename channel_type<P1>::type T1;
default_color_converter_impl<cmyk_t,C2>()(
pixel<T1,cmyk_layout_t>(channel_multiply(get_color(src,cyan_t()), get_color(src,alpha_t())),
channel_multiply(get_color(src,magenta_t()),get_color(src,alpha_t())),
channel_multiply(get_color(src,yellow_t()), get_color(src,alpha_t())),
channel_multiply(get_color(src,black_t()), get_color(src,alpha_t())))
,dst);
}
typename PixelRef::value_type operator()( const PixelRef& p)
{
typename PixelRef::value_type r;
get_color( r, red_t()) = channel_multiply( get_color( p, red_t()), get_color( p, alpha_t()));
get_color( r, green_t()) = channel_multiply( get_color( p, green_t()), get_color( p, alpha_t()));
get_color( r, blue_t()) = channel_multiply( get_color( p, blue_t()), get_color( p, alpha_t()));
get_color( r, alpha_t()) = get_color( p, alpha_t());
return r;
}
void operator()(const P1& src, P2& dst) const {
get_color(dst,red_t()) =
channel_convert<typename color_element_type<P2, red_t>::type>(
channel_multiply(get_color(src,gray_color_t()),get_color(src,alpha_t()) )
);
get_color(dst,green_t()) =
channel_convert<typename color_element_type<P2, green_t>::type>(
channel_multiply(get_color(src,gray_color_t()),get_color(src,alpha_t()) )
);
get_color(dst,blue_t()) =
channel_convert<typename color_element_type<P2, blue_t>::type>(
channel_multiply(get_color(src,gray_color_t()),get_color(src,alpha_t()) )
);
}
void operator () (Channel c) const {
// @todo: need to do a “channel_convert” too, in case the channel types aren't the same?
get_color (dst_, Channel()) = channel_multiply(get_color(src_,Channel()), alpha_or_max(src_));
}
