Hi Mark,
Luminosity is a single channel, and single-channel images in GIL are specified using a gray_layout_t layout. It doesn't make sense to keep the layout of the destination view; in fact you should require that the destination view is a single channel view (i.e. has a gray_layout_t layout)
Lubomir
On Nov 16, 2011, at 2:35 PM, Sapp, Mark wrote:
Hi All,
The following code is straight out of the tutorial about making function generic. Can anyone suggest how I might determine the layout of DstView here so that I can build an image of the same layout? In this example they hardcode gray_layout_t and I’m not seeing any metafunctions that return the layout.
template
void x_luminosity_gradient(const SrcView& src, const DstView& dst) {
typedef typename channel_type<DstView>::type d_channel_t;
typedef typename channel_convert_to_unsigned::type channel_t;
typedef typename image_type::type gray_image_t;
typedef typename gray_image_t::value_type gray_pixel_t;
gray_image_t ccv_image(src.dimensions());
copy_and_convert_pixels(src, view(ccv_image));
x_gradient(const_view(ccv_image), dst);
}
Thanks,
Mark
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