Re: [Boost-users] [gil] metafunction for layout

Subject: Re: [Boost-users] [gil] metafunction for layout
From: Sapp, Mark (Mark.Sapp_at_[hidden])
Date: 2011-11-21 14:19:33

Hi All,

 

I was able to accomplish what I needed using the following code. Please provide feedback if you see any potential issues/flaws or a cleaner way to define derived types.

 

void function(const SrcView& src, const DstView& dst) const

{

   typedef typename channel_type< DstView >::type dstChannelType;

   typedef typename channel_mapping_type< DstView >::type dstChannelMappingType;

   typedef typename color_space_type< DstView >::type dstColorSpaceType;

   typedef typename layout< dstColorSpaceType, dstChannelMappingType > dstLayout;

   typedef typename image_type< dstChannelType, dstLayout >::type dstImageType;

   typedef typename dstImageType::value_type dstPixelType;

   typedef typename image_type< bits32f, dstLayout >::type dst32f_image_t;

   typedef typename dst32f_image_t::value_type dst32f_pixel_t;

...

 

With this I can create images inside this function that are bit32f versions of dst. I wish there was a metafunction that returned the layout of view, so that I could simplify this to 1 or 2 lines of code, but functionally it works. Also, dstPixelType is used with color_convert_view as demonstrated below. I’d appreciate any feedback about more appropriate ways of converting the src to the dst type.

 

color_converted_view< dstPixelType >(src)

 

Thanks,

Mark


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