2 // Copyright 2005-2007 Adobe Systems Incorporated
4 // Distributed under the Boost Software License, Version 1.0
5 // See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt
8 #ifndef BOOST_GIL_METAFUNCTIONS_HPP
9 #define BOOST_GIL_METAFUNCTIONS_HPP
11 #include <boost/gil/channel.hpp>
12 #include <boost/gil/dynamic_step.hpp>
13 #include <boost/gil/concepts.hpp>
14 #include <boost/gil/concepts/detail/type_traits.hpp>
15 #include <boost/gil/detail/mp11.hpp>
18 #include <type_traits>
20 namespace boost { namespace gil {
22 // forward declarations
23 template <typename T, typename L> struct pixel;
24 template <typename BitField,typename ChannelRefs,typename Layout> struct packed_pixel;
25 template <typename T, typename C> struct planar_pixel_reference;
26 template <typename IC, typename C> struct planar_pixel_iterator;
27 template <typename I> class memory_based_step_iterator;
28 template <typename I> class memory_based_2d_locator;
29 template <typename L> class image_view;
30 template <typename Pixel, bool IsPlanar, typename Alloc> class image;
31 template <typename T> struct channel_type;
32 template <typename T> struct color_space_type;
33 template <typename T> struct channel_mapping_type;
34 template <typename It> struct is_iterator_adaptor;
35 template <typename It> struct iterator_adaptor_get_base;
36 template <typename BitField, typename ChannelBitSizes, typename Layout, bool IsMutable> struct bit_aligned_pixel_reference;
38 //////////////////////////////////////////////////
40 /// TYPE ANALYSIS METAFUNCTIONS
41 /// Predicate metafunctions determining properties of GIL types
43 //////////////////////////////////////////////////
46 /// \defgroup GILIsBasic xxx_is_basic
47 /// \ingroup TypeAnalysis
48 /// \brief Determines if GIL constructs are basic.
49 /// Basic constructs are the ones that can be generated with the type
50 /// factory methods pixel_reference_type, iterator_type, locator_type, view_type and image_type
51 /// They can be mutable/immutable, planar/interleaved, step/nonstep. They must use GIL-provided models.
53 /// \brief Determines if a given pixel reference is basic
54 /// Basic references must use gil::pixel& (if interleaved), gil::planar_pixel_reference (if planar). They must use the standard constness rules.
55 /// \ingroup GILIsBasic
56 template <typename PixelRef>
57 struct pixel_reference_is_basic : public std::false_type {};
59 template <typename T, typename L>
60 struct pixel_reference_is_basic<pixel<T, L>&> : std::true_type {};
62 template <typename T, typename L>
63 struct pixel_reference_is_basic<const pixel<T, L>&> : std::true_type {};
65 template <typename TR, typename CS>
66 struct pixel_reference_is_basic<planar_pixel_reference<TR, CS>> : std::true_type {};
68 template <typename TR, typename CS>
69 struct pixel_reference_is_basic<const planar_pixel_reference<TR, CS>> : std::true_type {};
71 /// \brief Determines if a given pixel iterator is basic
72 /// Basic iterators must use gil::pixel (if interleaved), gil::planar_pixel_iterator (if planar) and gil::memory_based_step_iterator (if step). They must use the standard constness rules.
73 /// \ingroup GILIsBasic
74 template <typename Iterator>
75 struct iterator_is_basic : std::false_type {};
77 /// \tparam T mutable interleaved pixel type
78 template <typename T, typename L>
79 struct iterator_is_basic<pixel<T, L>*> : std::true_type {};
81 /// \tparam T immutable interleaved pixel type
82 template <typename T, typename L>
83 struct iterator_is_basic<pixel<T, L> const*> : std::true_type {};
85 /// \tparam T mutable planar pixel type
86 template <typename T, typename CS>
87 struct iterator_is_basic<planar_pixel_iterator<T*, CS>> : std::true_type {};
89 /// \tparam T immutable planar pixel type
90 template <typename T, typename CS>
91 struct iterator_is_basic<planar_pixel_iterator<T const*, CS>> : std::true_type {};
93 /// \tparam T mutable interleaved step
94 template <typename T, typename L>
95 struct iterator_is_basic<memory_based_step_iterator<pixel<T, L>*>> : std::true_type {};
97 /// \tparam T immutable interleaved step
98 template <typename T, typename L>
99 struct iterator_is_basic<memory_based_step_iterator<pixel<T, L> const*>> : std::true_type {};
101 /// \tparam T mutable planar step
102 template <typename T, typename CS>
103 struct iterator_is_basic<memory_based_step_iterator<planar_pixel_iterator<T*, CS>>>
107 /// \tparam T immutable planar step
108 template <typename T, typename CS>
109 struct iterator_is_basic<memory_based_step_iterator<planar_pixel_iterator<T const*, CS>>>
114 /// \ingroup GILIsBasic
115 /// \brief Determines if a given locator is basic. A basic locator is memory-based and has basic x_iterator and y_iterator
116 template <typename Loc>
117 struct locator_is_basic : std::false_type {};
119 template <typename Iterator>
120 struct locator_is_basic
122 memory_based_2d_locator<memory_based_step_iterator<Iterator>>
123 > : iterator_is_basic<Iterator>
126 /// \ingroup GILIsBasic
127 /// \brief Basic views must be over basic locators
128 template <typename View>
129 struct view_is_basic : std::false_type {};
131 template <typename Loc>
132 struct view_is_basic<image_view<Loc>> : locator_is_basic<Loc> {};
134 /// \ingroup GILIsBasic
135 /// \brief Basic images must use basic views and std::allocator
136 template <typename Img>
137 struct image_is_basic : std::false_type {};
139 template <typename Pixel, bool IsPlanar, typename Alloc>
140 struct image_is_basic<image<Pixel, IsPlanar, Alloc>> : std::true_type {};
143 /// \defgroup GILIsStep xxx_is_step
144 /// \ingroup TypeAnalysis
145 /// \brief Determines if the given iterator/locator/view has a step that could be set dynamically
147 template <typename I>
148 struct iterator_is_step;
152 template <typename It, bool IsBase, bool EqualsStepType>
153 struct iterator_is_step_impl;
155 // iterator that has the same type as its dynamic_x_step_type must be a step iterator
156 template <typename It, bool IsBase>
157 struct iterator_is_step_impl<It, IsBase, true> : std::true_type {};
159 // base iterator can never be a step iterator
160 template <typename It>
161 struct iterator_is_step_impl<It, true, false> : std::false_type {};
163 // for an iterator adaptor, see if its base is step
164 template <typename It>
165 struct iterator_is_step_impl<It, false, false>
166 : public iterator_is_step<typename iterator_adaptor_get_base<It>::type> {};
168 } // namespace detail
170 /// \ingroup GILIsStep
171 /// \brief Determines if the given iterator has a step that could be set dynamically
172 template <typename I>
173 struct iterator_is_step
174 : detail::iterator_is_step_impl
177 !is_iterator_adaptor<I>::value,
178 std::is_same<I, typename dynamic_x_step_type<I>::type
183 /// \ingroup GILIsStep
184 /// \brief Determines if the given locator has a horizontal step that could be set dynamically
185 template <typename L> struct locator_is_step_in_x : public iterator_is_step<typename L::x_iterator> {};
187 /// \ingroup GILIsStep
188 /// \brief Determines if the given locator has a vertical step that could be set dynamically
189 template <typename L> struct locator_is_step_in_y : public iterator_is_step<typename L::y_iterator> {};
191 /// \ingroup GILIsStep
192 /// \brief Determines if the given view has a horizontal step that could be set dynamically
193 template <typename V> struct view_is_step_in_x : public locator_is_step_in_x<typename V::xy_locator> {};
195 /// \ingroup GILIsStep
196 /// \brief Determines if the given view has a vertical step that could be set dynamically
197 template <typename V> struct view_is_step_in_y : public locator_is_step_in_y<typename V::xy_locator> {};
199 /// \brief Determines whether the given pixel reference is a proxy class or a native C++ reference
200 /// \ingroup TypeAnalysis
201 template <typename PixelReference>
202 struct pixel_reference_is_proxy
207 typename detail::remove_const_and_reference<PixelReference>::type,
208 typename detail::remove_const_and_reference<PixelReference>::type::value_type
213 /// \brief Given a model of a pixel, determines whether the model represents a pixel reference (as opposed to pixel value)
214 /// \ingroup TypeAnalysis
215 template <typename Pixel>
216 struct pixel_is_reference
217 : mp11::mp_or<is_reference<Pixel>, pixel_reference_is_proxy<Pixel>> {};
219 /// \defgroup GILIsMutable xxx_is_mutable
220 /// \ingroup TypeAnalysis
221 /// \brief Determines if the given pixel reference/iterator/locator/view is mutable (i.e. its pixels can be changed)
223 /// \ingroup GILIsMutable
224 /// \brief Determines if the given pixel reference is mutable (i.e. its channels can be changed)
226 /// Note that built-in C++ references obey the const qualifier but reference proxy classes do not.
227 template <typename R>
228 struct pixel_reference_is_mutable
229 : std::integral_constant<bool, std::remove_reference<R>::type::is_mutable>
232 template <typename R>
233 struct pixel_reference_is_mutable<R const&>
234 : mp11::mp_and<pixel_reference_is_proxy<R>, pixel_reference_is_mutable<R>>
237 /// \ingroup GILIsMutable
238 /// \brief Determines if the given locator is mutable (i.e. its pixels can be changed)
239 template <typename L> struct locator_is_mutable : public iterator_is_mutable<typename L::x_iterator> {};
240 /// \ingroup GILIsMutable
241 /// \brief Determines if the given view is mutable (i.e. its pixels can be changed)
242 template <typename V> struct view_is_mutable : public iterator_is_mutable<typename V::x_iterator> {};
245 //////////////////////////////////////////////////
247 /// TYPE FACTORY METAFUNCTIONS
248 /// Metafunctions returning GIL types from other GIL types
250 //////////////////////////////////////////////////
252 /// \defgroup TypeFactoryFromElements xxx_type
253 /// \ingroup TypeFactory
254 /// \brief Returns the type of a homogeneous GIL construct given its elements (channel, layout, whether it is planar, step, mutable, etc.)
256 /// \defgroup TypeFactoryFromPixel xxx_type_from_pixel
257 /// \ingroup TypeFactory
258 /// \brief Returns the type of a GIL construct given its pixel type, whether it is planar, step, mutable, etc.
260 /// \defgroup TypeFactoryDerived derived_xxx_type
261 /// \ingroup TypeFactory
262 /// \brief Returns the type of a homogeneous GIL construct given a related construct by changing some of its properties
264 /// \ingroup TypeFactoryFromElements
265 /// \brief Returns the type of a homogeneous pixel reference given the channel type, layout, whether it operates on planar data and whether it is mutable
266 template <typename T, typename L, bool IsPlanar=false, bool IsMutable=true> struct pixel_reference_type{};
267 template <typename T, typename L> struct pixel_reference_type<T,L,false,true > { using type = pixel<T,L>&; };
268 template <typename T, typename L> struct pixel_reference_type<T,L,false,false> { using type = pixel<T,L> const&; };
269 template <typename T, typename L> struct pixel_reference_type<T,L,true,true> { using type = planar_pixel_reference<typename channel_traits<T>::reference,typename color_space_type<L>::type> const; }; // TODO: Assert M=identity
270 template <typename T, typename L> struct pixel_reference_type<T,L,true,false> { using type = planar_pixel_reference<typename channel_traits<T>::const_reference,typename color_space_type<L>::type> const; };// TODO: Assert M=identity
272 /// \ingroup TypeFactoryFromPixel
273 /// \brief Returns the type of a pixel iterator given the pixel type, whether it operates on planar data, whether it is a step iterator, and whether it is mutable
274 template <typename Pixel, bool IsPlanar=false, bool IsStep=false, bool IsMutable=true> struct iterator_type_from_pixel{};
275 template <typename Pixel> struct iterator_type_from_pixel<Pixel,false,false,true > { using type = Pixel *; };
276 template <typename Pixel> struct iterator_type_from_pixel<Pixel,false,false,false> { using type = const Pixel *; };
277 template <typename Pixel> struct iterator_type_from_pixel<Pixel,true,false,true> {
278 using type = planar_pixel_iterator<typename channel_traits<typename channel_type<Pixel>::type>::pointer,typename color_space_type<Pixel>::type>;
280 template <typename Pixel> struct iterator_type_from_pixel<Pixel,true,false,false> {
281 using type = planar_pixel_iterator<typename channel_traits<typename channel_type<Pixel>::type>::const_pointer,typename color_space_type<Pixel>::type>;
283 template <typename Pixel, bool IsPlanar, bool IsMutable> struct iterator_type_from_pixel<Pixel,IsPlanar,true,IsMutable> {
284 using type = memory_based_step_iterator<typename iterator_type_from_pixel<Pixel,IsPlanar,false,IsMutable>::type>;
287 /// \ingroup TypeFactoryFromElements
288 /// \brief Returns the type of a homogeneous iterator given the channel type, layout, whether it operates on planar data, whether it is a step iterator, and whether it is mutable
289 template <typename T, typename L, bool IsPlanar=false, bool IsStep=false, bool IsMutable=true> struct iterator_type{};
290 template <typename T, typename L> struct iterator_type<T,L,false,false,true > { using type = pixel<T,L>*; };
291 template <typename T, typename L> struct iterator_type<T,L,false,false,false> { using type = pixel<T,L> const*; };
292 template <typename T, typename L> struct iterator_type<T,L,true,false,true> { using type = planar_pixel_iterator<T*,typename L::color_space_t>; }; // TODO: Assert M=identity
293 template <typename T, typename L> struct iterator_type<T,L,true,false,false> { using type = planar_pixel_iterator<const T*,typename L::color_space_t>; }; // TODO: Assert M=identity
294 template <typename T, typename L, bool IsPlanar, bool IsMutable> struct iterator_type<T,L,IsPlanar,true,IsMutable> {
295 using type = memory_based_step_iterator<typename iterator_type<T,L,IsPlanar,false,IsMutable>::type>;
298 /// \brief Given a pixel iterator defining access to pixels along a row, returns the types of the corresponding built-in step_iterator, xy_locator, image_view
299 /// \ingroup TypeFactory
300 template <typename XIterator>
301 struct type_from_x_iterator
303 using step_iterator_t = memory_based_step_iterator<XIterator>;
304 using xy_locator_t = memory_based_2d_locator<step_iterator_t>;
305 using view_t = image_view<xy_locator_t>;
310 template <typename BitField, typename FirstBit, typename NumBits>
311 struct packed_channel_reference_type
313 using type = packed_channel_reference
315 BitField, FirstBit::value, NumBits::value, true
319 template <typename BitField, typename ChannelBitSizes>
320 class packed_channel_references_vector_type
322 template <typename FirstBit, typename NumBits>
323 using reference_type = typename packed_channel_reference_type<BitField, FirstBit, NumBits>::type;
325 // If ChannelBitSizesVector is mp11::mp_list_c<int,7,7,2>
326 // Then first_bits_vector will be mp11::mp_list_c<int,0,7,14,16>
327 using first_bit_list = mp11::mp_fold_q
330 mp11::mp_list<std::integral_constant<int, 0>>,
338 mp11::mp_bind<mp_back, mp11::_1>,
344 static_assert(mp11::mp_at_c<first_bit_list, 0>::value == 0, "packed channel first bit must be 0");
347 using type = mp11::mp_transform
350 mp_pop_back<first_bit_list>,
355 } // namespace detail
357 /// \ingroup TypeFactoryFromElements
358 /// \brief Returns the type of a packed pixel given its bitfield type, the bit size of its channels and its layout.
360 /// A packed pixel has channels that cover bit ranges but itself is byte aligned. RGB565 pixel is an example.
362 /// The size of ChannelBitSizes must equal the number of channels in the given layout
363 /// The sum of bit sizes for all channels must be less than or equal to the number of bits in BitField (and cannot exceed 64).
364 /// If it is less than the number of bits in BitField, the last bits will be unused.
365 template <typename BitField, typename ChannelBitSizes, typename Layout>
366 struct packed_pixel_type
368 using type = packed_pixel
371 typename detail::packed_channel_references_vector_type
379 /// \defgroup TypeFactoryPacked packed_image_type,bit_aligned_image_type
380 /// \ingroup TypeFactoryFromElements
381 /// \brief Returns the type of an image whose channels are not byte-aligned.
383 /// A packed image is an image whose pixels are byte aligned, such as "rgb565". <br>
384 /// A bit-aligned image is an image whose pixels are not byte aligned, such as "rgb222". <br>
386 /// The sum of the bit sizes of all channels cannot exceed 64.
388 /// \ingroup TypeFactoryPacked
389 /// \brief Returns the type of an interleaved packed image: an image whose channels may not be byte-aligned, but whose pixels are byte aligned.
390 template <typename BitField, typename ChannelBitSizes, typename Layout, typename Alloc=std::allocator<unsigned char>>
391 struct packed_image_type
393 using type = image<typename packed_pixel_type<BitField,ChannelBitSizes,Layout>::type,false,Alloc>;
396 /// \ingroup TypeFactoryPacked
397 /// \brief Returns the type of a single-channel image given its bitfield type, the bit size of its channel and its layout
398 template <typename BitField, unsigned Size1, typename Layout, typename Alloc = std::allocator<unsigned char>>
399 struct packed_image1_type
400 : packed_image_type<BitField, mp11::mp_list_c<unsigned, Size1>, Layout, Alloc>
403 /// \ingroup TypeFactoryPacked
404 /// \brief Returns the type of a two channel image given its bitfield type, the bit size of its channels and its layout
405 template <typename BitField, unsigned Size1, unsigned Size2, typename Layout, typename Alloc = std::allocator<unsigned char>>
406 struct packed_image2_type
407 : packed_image_type<BitField, mp11::mp_list_c<unsigned, Size1, Size2>, Layout, Alloc>
410 /// \ingroup TypeFactoryPacked
411 /// \brief Returns the type of a three channel image given its bitfield type, the bit size of its channels and its layout
412 template <typename BitField, unsigned Size1, unsigned Size2, unsigned Size3, typename Layout, typename Alloc = std::allocator<unsigned char>>
413 struct packed_image3_type
414 : packed_image_type<BitField, mp11::mp_list_c<unsigned, Size1, Size2, Size3>, Layout, Alloc>
417 /// \ingroup TypeFactoryPacked
418 /// \brief Returns the type of a four channel image given its bitfield type, the bit size of its channels and its layout
419 template <typename BitField, unsigned Size1, unsigned Size2, unsigned Size3, unsigned Size4, typename Layout, typename Alloc = std::allocator<unsigned char>>
420 struct packed_image4_type
421 : packed_image_type<BitField, mp11::mp_list_c<unsigned, Size1, Size2, Size3, Size4>, Layout, Alloc>
424 /// \ingroup TypeFactoryPacked
425 /// \brief Returns the type of a five channel image given its bitfield type, the bit size of its channels and its layout
426 template <typename BitField, unsigned Size1, unsigned Size2, unsigned Size3, unsigned Size4, unsigned Size5, typename Layout, typename Alloc = std::allocator<unsigned char>>
427 struct packed_image5_type
428 : packed_image_type<BitField, mp11::mp_list_c<unsigned, Size1, Size2, Size3, Size4, Size5>, Layout, Alloc> {};
431 /// \ingroup TypeFactoryPacked
432 /// \brief Returns the type of a packed image whose pixels may not be byte aligned. For example, an "rgb222" image is bit-aligned because its pixel spans six bits.
434 /// Note that the alignment parameter in the constructor of bit-aligned images is in bit units. For example, if you want to construct a bit-aligned
435 /// image whose rows are byte-aligned, use 8 as the alignment parameter, not 1.
439 typename ChannelBitSizes,
441 typename Alloc = std::allocator<unsigned char>
443 struct bit_aligned_image_type
447 static constexpr int bit_size =
451 std::integral_constant<int, 0>,
455 using bitfield_t = typename detail::min_fast_uint<bit_size + 7>::type;
456 using bit_alignedref_t = bit_aligned_pixel_reference<bitfield_t, ChannelBitSizes, Layout, true> const;
459 using type = image<bit_alignedref_t,false,Alloc>;
462 /// \ingroup TypeFactoryPacked
463 /// \brief Returns the type of a single-channel bit-aligned image given the bit size of its channel and its layout
464 template <unsigned Size1, typename Layout, typename Alloc = std::allocator<unsigned char>>
465 struct bit_aligned_image1_type : bit_aligned_image_type<mp11::mp_list_c<unsigned, Size1>, Layout, Alloc> {};
467 /// \ingroup TypeFactoryPacked
468 /// \brief Returns the type of a two channel bit-aligned image given the bit size of its channels and its layout
469 template <unsigned Size1, unsigned Size2, typename Layout, typename Alloc = std::allocator<unsigned char>>
470 struct bit_aligned_image2_type : bit_aligned_image_type<mp11::mp_list_c<unsigned, Size1, Size2>, Layout, Alloc> {};
472 /// \ingroup TypeFactoryPacked
473 /// \brief Returns the type of a three channel bit-aligned image given the bit size of its channels and its layout
474 template <unsigned Size1, unsigned Size2, unsigned Size3, typename Layout, typename Alloc = std::allocator<unsigned char>>
475 struct bit_aligned_image3_type : bit_aligned_image_type<mp11::mp_list_c<unsigned, Size1, Size2, Size3>, Layout, Alloc> {};
477 /// \ingroup TypeFactoryPacked
478 /// \brief Returns the type of a four channel bit-aligned image given the bit size of its channels and its layout
479 template <unsigned Size1, unsigned Size2, unsigned Size3, unsigned Size4, typename Layout, typename Alloc = std::allocator<unsigned char>>
480 struct bit_aligned_image4_type : bit_aligned_image_type<mp11::mp_list_c<unsigned, Size1, Size2, Size3, Size4>, Layout, Alloc> {};
482 /// \ingroup TypeFactoryPacked
483 /// \brief Returns the type of a five channel bit-aligned image given the bit size of its channels and its layout
484 template <unsigned Size1, unsigned Size2, unsigned Size3, unsigned Size4, unsigned Size5, typename Layout, typename Alloc = std::allocator<unsigned char>>
485 struct bit_aligned_image5_type : bit_aligned_image_type<mp11::mp_list_c<unsigned, Size1, Size2, Size3, Size4, Size5>, Layout, Alloc> {};
488 /// \ingroup TypeFactoryFromElements
489 /// \brief Returns the type of a homogeneous pixel given the channel type and layout
490 template <typename Channel, typename Layout>
491 struct pixel_value_type
493 // by default use gil::pixel. Specializations are provided for
494 using type = pixel<Channel, Layout>;
497 // Specializations for packed channels
498 template <typename BitField, int NumBits, bool IsMutable, typename Layout>
499 struct pixel_value_type<packed_dynamic_channel_reference<BitField, NumBits, IsMutable>, Layout>
500 : packed_pixel_type<BitField, mp11::mp_list_c<unsigned, NumBits>, Layout>
503 template <typename BitField, int NumBits, bool IsMutable, typename Layout>
504 struct pixel_value_type<packed_dynamic_channel_reference<BitField, NumBits, IsMutable> const, Layout>
505 : packed_pixel_type<BitField, mp11::mp_list_c<unsigned, NumBits>, Layout>
508 template <typename BitField, int FirstBit, int NumBits, bool IsMutable, typename Layout>
509 struct pixel_value_type<packed_channel_reference<BitField, FirstBit, NumBits, IsMutable>, Layout>
510 : packed_pixel_type<BitField, mp11::mp_list_c<unsigned, NumBits>, Layout>
513 template <typename BitField, int FirstBit, int NumBits, bool IsMutable, typename Layout>
514 struct pixel_value_type<packed_channel_reference<BitField, FirstBit, NumBits, IsMutable> const, Layout>
515 : packed_pixel_type<BitField, mp11::mp_list_c<unsigned, NumBits>, Layout>
518 template <int NumBits, typename Layout>
519 struct pixel_value_type<packed_channel_value<NumBits>, Layout>
520 : packed_pixel_type<typename detail::min_fast_uint<NumBits>::type, mp11::mp_list_c<unsigned, NumBits>, Layout>
523 /// \ingroup TypeFactoryFromElements
524 /// \brief Returns the type of a homogeneous locator given the channel type, layout, whether it operates on planar data and whether it has a step horizontally
525 template <typename T, typename L, bool IsPlanar = false, bool IsStepX = false, bool IsMutable = true>
528 using type = typename type_from_x_iterator
530 typename iterator_type<T, L, IsPlanar, IsStepX, IsMutable>::type
534 /// \ingroup TypeFactoryFromElements
535 /// \brief Returns the type of a homogeneous view given the channel type, layout, whether it operates on planar data and whether it has a step horizontally
536 template <typename T, typename L, bool IsPlanar = false, bool IsStepX = false, bool IsMutable = true>
539 using type = typename type_from_x_iterator
541 typename iterator_type<T, L, IsPlanar, IsStepX, IsMutable>::type
545 /// \ingroup TypeFactoryFromElements
546 /// \brief Returns the type of a homogeneous image given the channel type, layout, and whether it operates on planar data
547 template <typename T, typename L, bool IsPlanar = false, typename Alloc = std::allocator<unsigned char>>
550 using type = image<pixel<T, L>, IsPlanar, Alloc>;
553 /// \ingroup TypeFactoryFromPixel
554 /// \brief Returns the type of a view the pixel type, whether it operates on planar data and whether it has a step horizontally
555 template <typename Pixel, bool IsPlanar=false, bool IsStepX=false, bool IsMutable=true>
556 struct view_type_from_pixel {
557 using type = typename type_from_x_iterator<typename iterator_type_from_pixel<Pixel,IsPlanar,IsStepX,IsMutable>::type>::view_t;
561 /// \brief Constructs a pixel reference type from a source pixel reference type by changing some of the properties.
562 /// \ingroup TypeFactoryDerived
563 /// Use use_default for the properties of the source view that you want to keep
567 typename T = use_default,
568 typename L = use_default,
569 typename IsPlanar = use_default,
570 typename IsMutable = use_default>
571 class derived_pixel_reference_type
573 using pixel_t = typename std::remove_reference<Ref>::type;
575 using channel_t = typename mp11::mp_if
577 std::is_same<T, use_default>,
578 typename channel_type<pixel_t>::type,
582 using layout_t = typename mp11::mp_if
584 std::is_same<L, use_default>,
587 typename color_space_type<pixel_t>::type,
588 typename channel_mapping_type<pixel_t>::type
593 static bool const mut = mp11::mp_if
595 std::is_same<IsMutable, use_default>,
596 pixel_reference_is_mutable<Ref>,
600 static bool const planar = mp11::mp_if
602 std::is_same<IsPlanar, use_default>,
608 using type = typename pixel_reference_type<channel_t, layout_t, planar, mut>::type;
611 /// \brief Constructs a pixel iterator type from a source pixel iterator type by changing some of the properties.
612 /// \ingroup TypeFactoryDerived
613 /// Use use_default for the properties of the source view that you want to keep
617 typename T = use_default,
618 typename L = use_default,
619 typename IsPlanar = use_default,
620 typename IsStep = use_default,
621 typename IsMutable = use_default
623 class derived_iterator_type
625 using channel_t = typename mp11::mp_if
627 std::is_same<T, use_default>,
628 typename channel_type<Iterator>::type,
632 using layout_t = typename mp11::mp_if
634 std::is_same<L, use_default>,
637 typename color_space_type<Iterator>::type,
638 typename channel_mapping_type<Iterator>::type
643 static const bool mut = mp11::mp_if
645 std::is_same<IsMutable, use_default>,
646 iterator_is_mutable<Iterator>,
650 static bool const planar = mp11::mp_if
652 std::is_same<IsPlanar, use_default>,
657 static bool const step = mp11::mp_if
659 std::is_same<IsStep, use_default>,
660 iterator_is_step<Iterator>,
665 using type = typename iterator_type<channel_t, layout_t, planar, step, mut>::type;
668 /// \brief Constructs an image view type from a source view type by changing some of the properties.
669 /// \ingroup TypeFactoryDerived
670 /// Use use_default for the properties of the source view that you want to keep
671 template <typename View, typename T = use_default, typename L = use_default, typename IsPlanar = use_default, typename StepX = use_default, typename IsMutable = use_default>
672 class derived_view_type
674 using channel_t = typename mp11::mp_if
676 std::is_same<T, use_default>,
677 typename channel_type<View>::type,
681 using layout_t = typename mp11::mp_if
683 std::is_same<L, use_default>,
686 typename color_space_type<View>::type,
687 typename channel_mapping_type<View>::type
692 static bool const mut = mp11::mp_if
694 std::is_same<IsMutable, use_default>,
695 view_is_mutable<View>,
699 static bool const planar = mp11::mp_if
701 std::is_same<IsPlanar, use_default>,
706 static bool const step = mp11::mp_if
708 std::is_same<StepX, use_default>,
709 view_is_step_in_x<View>,
714 using type = typename view_type<channel_t, layout_t, planar, step, mut>::type;
717 /// \brief Constructs a homogeneous image type from a source image type by changing some of the properties.
718 /// \ingroup TypeFactoryDerived
719 /// Use use_default for the properties of the source image that you want to keep
720 template <typename Image, typename T = use_default, typename L = use_default, typename IsPlanar = use_default>
721 class derived_image_type
723 using channel_t = typename mp11::mp_if
725 std::is_same<T, use_default>,
726 typename channel_type<Image>::type,
730 using layout_t = typename mp11::mp_if
732 std::is_same<L, use_default>,
735 typename color_space_type<Image>::type,
736 typename channel_mapping_type<Image>::type>,
740 static bool const planar = mp11::mp_if
742 std::is_same<IsPlanar, use_default>,
748 using type = typename image_type<channel_t, layout_t, planar>::type;
751 }} // namespace boost::gil