| 1 | /*
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| 2 | * Boost Software License - Version 1.0 - August 17th, 2003
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| 3 | *
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| 4 | * Permission is hereby granted, free of charge, to any person or organization
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| 5 | * obtaining a copy of the software and accompanying documentation covered by
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| 6 | * this license (the "Software") to use, reproduce, display, distribute,
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| 7 | * execute, and transmit the Software, and to prepare derivative works of the
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| 8 | * Software, and to permit third-parties to whom the Software is furnished to
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| 9 | * do so, all subject to the following:
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| 10 | *
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| 11 | * The copyright notices in the Software and this entire statement, including
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| 12 | * the above license grant, this restriction and the following disclaimer,
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| 13 | * must be included in all copies of the Software, in whole or in part, and
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| 14 | * all derivative works of the Software, unless such copies or derivative
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| 15 | * works are solely in the form of machine-executable object code generated by
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| 16 | * a source language processor.
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| 17 | *
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| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 20 | * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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| 21 | * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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| 22 | * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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| 23 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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| 24 | * DEALINGS IN THE SOFTWARE.
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| 25 | */
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| 26 |
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| 27 | ///@file remove_pixel.hpp
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| 28 | ///@since Aug 18, 2008
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| 29 | ///@author yoyohead
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| 30 | ///
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| 31 |
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| 32 | #pragma once
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| 33 | #ifndef REMOVE_PIXEL_HPP_INCLUDED
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| 34 | #define REMOVE_PIXEL_HPP_INCLUDED
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| 35 |
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| 36 |
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| 37 |
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| 38 | namespace i3dea{
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| 39 | namespace detail{
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| 40 |
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| 41 | template<class Pixel>
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| 42 | struct remove_pixelbased_deref :
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| 43 | boost::gil::deref_base<
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| 44 | remove_pixelbased_deref<const Pixel>,
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| 45 | typename boost::gil::kth_element_type<Pixel,0> ::type,
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| 46 | typename boost::gil::kth_element_reference_type<Pixel,0>::type,
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| 47 | typename boost::gil::kth_element_const_reference_type<Pixel,0>::type,
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| 48 | Pixel&,
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| 49 | typename boost::gil::kth_element_reference_type<Pixel,0>::type,
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| 50 | boost::is_const<Pixel>::value
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| 51 | >
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| 52 | {
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| 53 | //This is a unary function
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| 54 | typedef
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| 55 | typename boost::gil::kth_element_reference_type<Pixel,0>::type
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| 56 | result_type;
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| 57 | typedef Pixel& argument_type;
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| 58 |
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| 59 | //This is also a metafunction. (Like boost::int_, etc.)
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| 60 | typedef remove_pixelbased_deref<Pixel> type;
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| 61 |
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| 62 | result_type operator()(Pixel & pix) const {
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| 63 | return boost::gil::at_c<0>(pix);
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| 64 | }
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| 65 | };
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| 66 | } //detail
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| 67 |
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| 68 | namespace result_of{
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| 69 |
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| 70 | ///@brief Metafunction that returns the view type for the single
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| 71 | /// element of a gray view.
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| 72 | template<class ViewOrLoc>
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| 73 | struct remove_pixelbased:
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| 74 | ViewOrLoc::template add_deref<
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| 75 | typename detail::remove_pixelbased_deref<
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| 76 | typename ViewOrLoc::value_type
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| 77 | >::type
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| 78 | >
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| 79 | {};
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| 80 | }
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| 81 |
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| 82 | ///\brief Remove the 'pixelbased' wrapper from a view or locator to asingle channel pixel.
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| 83 | ///
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| 84 | /// Once the 'pixelbased' wrapper is removed, the view is no longer 'PixelBased'
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| 85 | /// and its value type is the first element of the pixel.
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| 86 | ///
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| 87 | template<class ViewOrLoc>
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| 88 | inline
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| 89 | typename result_of::remove_pixelbased<ViewOrLoc>::type
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| 90 | remove_pixelbased(ViewOrLoc src)
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| 91 | {
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| 92 | typedef
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| 93 | typename detail::remove_pixelbased_deref<
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| 94 | typename ViewOrLoc::value_type
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| 95 | >::type
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| 96 | deref_fn;
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| 97 |
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| 98 | return result_of::remove_pixelbased<ViewOrLoc>::make(src, deref_fn() );
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| 99 | }
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| 100 |
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| 101 | } //i3dea
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| 102 |
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| 103 |
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| 104 |
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| 105 | #endif //REMOVE_PIXEL_HPP_INCLUDED
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| 106 |
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| 107 |
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