Why flllowing method is virtual?
template <typename T, typename AT=T, class VP=value_prep<T,AT> >
etl::surface::set_wh(typename size_type::value_type w, typename
size_type::value_type h, unsigned char* newdata, const typename
size_type::value_type &pitch)
This method have one override:
void CairoSurface::set_wh(int w, int h, unsigned char* data, int pitch)
{ etl::surface<CairoColor, CairoColorAccumulator,
CairoColorPrep>::set_wh(w, h, data, pitch); }
Also this method never used when CairoSurface object passed by pointer or
reference as etl::surface.
I've removed 'virtual' keyword
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