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_IMAGE_HPP
9 #define BOOST_GIL_IMAGE_HPP
11 #include <boost/gil/algorithm.hpp>
12 #include <boost/gil/image_view.hpp>
13 #include <boost/gil/metafunctions.hpp>
14 #include <boost/gil/detail/mp11.hpp>
16 #include <boost/assert.hpp>
21 #include <type_traits>
23 namespace boost { namespace gil {
25 ////////////////////////////////////////////////////////////////////////////////////////
26 /// \ingroup ImageModel PixelBasedModel
27 /// \brief container interface over image view. Models ImageConcept, PixelBasedConcept
29 /// A 2D container whose elements are pixels. It is templated over the pixel type, a boolean
30 /// indicating whether it should be planar, and an optional allocator.
32 /// Note that its element type does not have to be a pixel. \p image can be instantiated with any Regular element,
33 /// in which case it models the weaker RandomAccess2DImageConcept and does not model PixelBasedConcept
35 /// When recreating an image of the same or smaller size the memory will be reused if possible.
37 ////////////////////////////////////////////////////////////////////////////////////////
39 template< typename Pixel, bool IsPlanar = false, typename Alloc=std::allocator<unsigned char> >
42 #if defined(BOOST_NO_CXX11_ALLOCATOR)
43 using allocator_type = typename Alloc::template rebind<unsigned char>::other;
45 using allocator_type = typename std::allocator_traits<Alloc>::template rebind_alloc<unsigned char>;
47 using view_t = typename view_type_from_pixel<Pixel, IsPlanar>::type;
48 using const_view_t = typename view_t::const_t;
49 using point_t = typename view_t::point_t;
50 using coord_t = typename view_t::coord_t;
51 using value_type = typename view_t::value_type;
52 using x_coord_t = coord_t;
53 using y_coord_t = coord_t;
55 const point_t& dimensions() const { return _view.dimensions(); }
56 x_coord_t width() const { return _view.width(); }
57 y_coord_t height() const { return _view.height(); }
59 explicit image(std::size_t alignment=0,
60 const Alloc alloc_in = Alloc()) :
61 _memory(nullptr), _align_in_bytes(alignment), _alloc(alloc_in), _allocated_bytes( 0 ) {}
63 // Create with dimensions and optional initial value and alignment
64 image(const point_t& dimensions,
65 std::size_t alignment=0,
66 const Alloc alloc_in = Alloc()) : _memory(nullptr), _align_in_bytes(alignment), _alloc(alloc_in)
67 , _allocated_bytes( 0 ) {
68 allocate_and_default_construct(dimensions);
71 image(x_coord_t width, y_coord_t height,
72 std::size_t alignment=0,
73 const Alloc alloc_in = Alloc()) : _memory(nullptr), _align_in_bytes(alignment), _alloc(alloc_in)
74 , _allocated_bytes( 0 ) {
75 allocate_and_default_construct(point_t(width,height));
78 image(const point_t& dimensions,
80 std::size_t alignment,
81 const Alloc alloc_in = Alloc()) : _memory(nullptr), _align_in_bytes(alignment), _alloc(alloc_in)
82 , _allocated_bytes( 0 ) {
83 allocate_and_fill(dimensions, p_in);
85 image(x_coord_t width, y_coord_t height,
87 std::size_t alignment = 0,
88 const Alloc alloc_in = Alloc()) : _memory(nullptr), _align_in_bytes(alignment), _alloc(alloc_in)
89 , _allocated_bytes ( 0 ) {
90 allocate_and_fill(point_t(width,height),p_in);
93 image(const image& img) : _memory(nullptr), _align_in_bytes(img._align_in_bytes), _alloc(img._alloc)
94 , _allocated_bytes( img._allocated_bytes ) {
95 allocate_and_copy(img.dimensions(),img._view);
98 template <typename P2, bool IP2, typename Alloc2>
99 image(const image<P2,IP2,Alloc2>& img) : _memory(nullptr), _align_in_bytes(img._align_in_bytes), _alloc(img._alloc)
100 , _allocated_bytes( img._allocated_bytes ) {
101 allocate_and_copy(img.dimensions(),img._view);
104 image& operator=(const image& img) {
105 if (dimensions() == img.dimensions())
106 copy_pixels(img._view,_view);
114 template <typename Img>
115 image& operator=(const Img& img) {
116 if (dimensions() == img.dimensions())
117 copy_pixels(img._view,_view);
126 destruct_pixels(_view);
130 Alloc& allocator() { return _alloc; }
131 Alloc const& allocator() const { return _alloc; }
133 void swap(image& img) { // required by MutableContainerConcept
135 swap(_align_in_bytes, img._align_in_bytes);
136 swap(_memory, img._memory);
137 swap(_view, img._view);
138 swap(_alloc, img._alloc);
139 swap(_allocated_bytes, img._allocated_bytes );
142 /////////////////////
144 /////////////////////
147 void recreate(const point_t& dims, std::size_t alignment = 0)
149 if (dims == _view.dimensions() && _align_in_bytes == alignment)
152 _align_in_bytes = alignment;
154 if (_allocated_bytes >= total_allocated_size_in_bytes(dims))
156 destruct_pixels(_view);
157 create_view(dims, std::integral_constant<bool, IsPlanar>());
158 default_construct_pixels(_view);
162 image tmp(dims, alignment);
167 void recreate(x_coord_t width, y_coord_t height, std::size_t alignment = 0)
169 recreate(point_t(width, height), alignment);
172 void recreate(const point_t& dims, const Pixel& p_in, std::size_t alignment = 0)
174 if (dims == _view.dimensions() && _align_in_bytes == alignment)
177 _align_in_bytes = alignment;
179 if (_allocated_bytes >= total_allocated_size_in_bytes(dims))
181 destruct_pixels(_view);
182 create_view(dims, typename std::integral_constant<bool, IsPlanar>());
183 uninitialized_fill_pixels(_view, p_in);
187 image tmp(dims, p_in, alignment);
192 void recreate( x_coord_t width, y_coord_t height, const Pixel& p_in, std::size_t alignment = 0 )
194 recreate( point_t( width, height ), p_in, alignment );
198 void recreate(const point_t& dims, std::size_t alignment, const Alloc alloc_in)
200 if (dims == _view.dimensions() && _align_in_bytes == alignment && alloc_in == _alloc)
203 _align_in_bytes = alignment;
205 if (_allocated_bytes >= total_allocated_size_in_bytes(dims))
207 destruct_pixels(_view);
208 create_view(dims, std::integral_constant<bool, IsPlanar>());
209 default_construct_pixels(_view);
213 image tmp(dims, alignment, alloc_in);
218 void recreate(x_coord_t width, y_coord_t height, std::size_t alignment, const Alloc alloc_in)
220 recreate(point_t(width, height), alignment, alloc_in);
223 void recreate(const point_t& dims, const Pixel& p_in, std::size_t alignment, const Alloc alloc_in)
225 if (dims == _view.dimensions() && _align_in_bytes == alignment && alloc_in == _alloc)
228 _align_in_bytes = alignment;
230 if (_allocated_bytes >= total_allocated_size_in_bytes(dims))
232 destruct_pixels(_view);
233 create_view(dims, std::integral_constant<bool, IsPlanar>());
234 uninitialized_fill_pixels(_view, p_in);
238 image tmp(dims, p_in, alignment, alloc_in);
243 void recreate(x_coord_t width, y_coord_t height, const Pixel& p_in, std::size_t alignment, const Alloc alloc_in )
245 recreate(point_t(width, height), p_in, alignment, alloc_in);
248 view_t _view; // contains pointer to the pixels, the image size and ways to navigate pixels
250 unsigned char* _memory;
251 std::size_t _align_in_bytes;
252 allocator_type _alloc;
254 std::size_t _allocated_bytes;
256 void allocate_and_default_construct(point_t const& dimensions)
260 allocate_(dimensions, std::integral_constant<bool, IsPlanar>());
261 default_construct_pixels(_view);
263 catch (...) { deallocate(); throw; }
266 void allocate_and_fill(const point_t& dimensions, Pixel const& p_in)
270 allocate_(dimensions, std::integral_constant<bool, IsPlanar>());
271 uninitialized_fill_pixels(_view, p_in);
273 catch(...) { deallocate(); throw; }
276 template <typename View>
277 void allocate_and_copy(const point_t& dimensions, View const& v)
281 allocate_(dimensions, std::integral_constant<bool, IsPlanar>());
282 uninitialized_copy_pixels(v, _view);
284 catch(...) { deallocate(); throw; }
289 if (_memory && _allocated_bytes > 0)
290 _alloc.deallocate(_memory, _allocated_bytes);
293 std::size_t is_planar_impl(
294 std::size_t const size_in_units,
295 std::size_t const channels_in_image,
296 std::true_type) const
298 return size_in_units * channels_in_image;
301 std::size_t is_planar_impl(
302 std::size_t const size_in_units,
304 std::false_type) const
306 return size_in_units;
309 std::size_t total_allocated_size_in_bytes(point_t const& dimensions) const
311 using x_iterator = typename view_t::x_iterator;
313 // when value_type is a non-pixel, like int or float, num_channels< ... > doesn't work.
314 constexpr std::size_t _channels_in_image =
317 is_pixel<value_type>::value,
318 num_channels<view_t>,
319 std::integral_constant<std::size_t, 1>
322 std::size_t size_in_units = is_planar_impl(
323 get_row_size_in_memunits(dimensions.x) * dimensions.y,
325 std::integral_constant<bool, IsPlanar>());
327 // return the size rounded up to the nearest byte
328 return ( size_in_units + byte_to_memunit< x_iterator >::value - 1 )
329 / byte_to_memunit<x_iterator>::value
330 + ( _align_in_bytes > 0 ? _align_in_bytes - 1 : 0 ); // add extra padding in case we need to align the first image pixel
333 std::size_t get_row_size_in_memunits(x_coord_t width) const { // number of units per row
334 std::size_t size_in_memunits = width*memunit_step(typename view_t::x_iterator());
335 if (_align_in_bytes>0) {
336 std::size_t alignment_in_memunits=_align_in_bytes*byte_to_memunit<typename view_t::x_iterator>::value;
337 return align(size_in_memunits, alignment_in_memunits);
339 return size_in_memunits;
342 void allocate_(point_t const& dimensions, std::false_type)
344 // if it throws and _memory!=0 the client must deallocate _memory
345 _allocated_bytes = total_allocated_size_in_bytes(dimensions);
346 _memory=_alloc.allocate( _allocated_bytes );
348 unsigned char* tmp=(_align_in_bytes>0) ? (unsigned char*)align((std::size_t)_memory,_align_in_bytes) : _memory;
349 _view=view_t(dimensions,typename view_t::locator(typename view_t::x_iterator(tmp), get_row_size_in_memunits(dimensions.x)));
351 BOOST_ASSERT(_view.width() == dimensions.x);
352 BOOST_ASSERT(_view.height() == dimensions.y);
355 void allocate_(point_t const& dimensions, std::true_type)
357 // if it throws and _memory!=0 the client must deallocate _memory
358 std::size_t row_size=get_row_size_in_memunits(dimensions.x);
359 std::size_t plane_size=row_size*dimensions.y;
361 _allocated_bytes = total_allocated_size_in_bytes( dimensions );
363 _memory = _alloc.allocate( _allocated_bytes );
365 unsigned char* tmp=(_align_in_bytes>0) ? (unsigned char*)align((std::size_t)_memory,_align_in_bytes) : _memory;
366 typename view_t::x_iterator first;
367 for (int i=0; i<num_channels<view_t>::value; ++i) {
368 dynamic_at_c(first,i) = (typename channel_type<view_t>::type*)tmp;
369 memunit_advance(dynamic_at_c(first,i), plane_size*i);
371 _view=view_t(dimensions, typename view_t::locator(first, row_size));
373 BOOST_ASSERT(_view.width() == dimensions.x);
374 BOOST_ASSERT(_view.height() == dimensions.y);
377 void create_view(point_t const& dims, std::true_type) // is planar
379 std::size_t row_size=get_row_size_in_memunits(dims.x);
380 std::size_t plane_size=row_size*dims.y;
382 unsigned char* tmp = ( _align_in_bytes > 0 ) ? (unsigned char*) align( (std::size_t) _memory
386 typename view_t::x_iterator first;
388 for (int i = 0; i < num_channels< view_t >::value; ++i )
390 dynamic_at_c( first, i ) = (typename channel_type<view_t>::type*) tmp;
392 memunit_advance( dynamic_at_c(first,i)
397 _view = view_t(dims, typename view_t::locator(first, row_size));
399 BOOST_ASSERT(_view.width() == dims.x);
400 BOOST_ASSERT(_view.height() == dims.y);
403 void create_view(point_t const& dims, std::false_type) // is planar
405 unsigned char* tmp = ( _align_in_bytes > 0 ) ? ( unsigned char* ) align( (std::size_t) _memory
411 , typename view_t::locator( typename view_t::x_iterator( tmp )
412 , get_row_size_in_memunits( dims.x )
416 BOOST_ASSERT(_view.width() == dims.x);
417 BOOST_ASSERT(_view.height() == dims.y);
421 template <typename Pixel, bool IsPlanar, typename Alloc>
422 void swap(image<Pixel, IsPlanar, Alloc>& im1,image<Pixel, IsPlanar, Alloc>& im2) {
426 template <typename Pixel1, bool IsPlanar1, typename Alloc1, typename Pixel2, bool IsPlanar2, typename Alloc2>
427 bool operator==(const image<Pixel1,IsPlanar1,Alloc1>& im1,const image<Pixel2,IsPlanar2,Alloc2>& im2) {
428 if ((void*)(&im1)==(void*)(&im2)) return true;
429 if (const_view(im1).dimensions()!=const_view(im2).dimensions()) return false;
430 return equal_pixels(const_view(im1),const_view(im2));
432 template <typename Pixel1, bool IsPlanar1, typename Alloc1, typename Pixel2, bool IsPlanar2, typename Alloc2>
433 bool operator!=(const image<Pixel1,IsPlanar1,Alloc1>& im1,const image<Pixel2,IsPlanar2,Alloc2>& im2) {return !(im1==im2);}
436 /// \name view, const_view
437 /// \brief Get an image view from an image
439 /// \ingroup ImageModel
441 /// \brief Returns the non-constant-pixel view of an image
442 template <typename Pixel, bool IsPlanar, typename Alloc> inline
443 const typename image<Pixel,IsPlanar,Alloc>::view_t& view(image<Pixel,IsPlanar,Alloc>& img) { return img._view; }
445 /// \brief Returns the constant-pixel view of an image
446 template <typename Pixel, bool IsPlanar, typename Alloc> inline
447 const typename image<Pixel,IsPlanar,Alloc>::const_view_t const_view(const image<Pixel,IsPlanar,Alloc>& img) {
448 return static_cast<const typename image<Pixel,IsPlanar,Alloc>::const_view_t>(img._view);
452 /////////////////////////////
454 /////////////////////////////
456 template <typename Pixel, bool IsPlanar, typename Alloc>
457 struct channel_type<image<Pixel, IsPlanar, Alloc>> : channel_type<Pixel> {};
459 template <typename Pixel, bool IsPlanar, typename Alloc>
460 struct color_space_type<image<Pixel, IsPlanar, Alloc>> : color_space_type<Pixel> {};
462 template <typename Pixel, bool IsPlanar, typename Alloc>
463 struct channel_mapping_type<image<Pixel, IsPlanar, Alloc>> : channel_mapping_type<Pixel> {};
465 template <typename Pixel, bool IsPlanar, typename Alloc>
466 struct is_planar<image<Pixel, IsPlanar, Alloc>> : std::integral_constant<bool, IsPlanar> {};
468 }} // namespace boost::gil