vsqbs sampler optimized by nicolas
vsqbs sampler optimized by nicolas

lovell/libvips,wishabi/libvips,wishabi/libvips,lovell/libvips,mcanthony/libvips,leiyangyou/libvips,jcupitt/libvips,jcupitt/libvips,jcupitt/libvips,leiyangyou/libvips,lovell/libvips,jcupitt/libvips,wishabi/libvips,mcanthony/libvips,wishabi/libvips,mcanthony/libvips,lovell/libvips,mcanthony/libvips,leiyangyou/libvips,leiyangyou/libvips