300 lines
13 KiB
C++
300 lines
13 KiB
C++
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/*
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Copyright 2005-2007 Adobe Systems Incorporated
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Use, modification and distribution are subject to the Boost Software License,
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Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt).
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See http://opensource.adobe.com/gil for most recent version including documentation.
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*/
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/*************************************************************************************************/
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#ifndef GIL_IMAGE_H
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#define GIL_IMAGE_H
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////////////////////////////////////////////////////////////////////////////////////////
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/// \file
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/// \brief Templated image
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/// \author Lubomir Bourdev and Hailin Jin \n
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/// Adobe Systems Incorporated
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/// \date 2005-2007 \n Last updated on February 12, 2007
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///
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////////////////////////////////////////////////////////////////////////////////////////
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#include <cstddef>
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#include <memory>
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#include "gil_config.hpp"
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#include "image_view.hpp"
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#include "metafunctions.hpp"
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#include "algorithm.hpp"
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namespace boost { namespace gil {
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//#ifdef _MSC_VER
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//#pragma warning(push)
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//#pragma warning(disable : 4244) // conversion from 'gil::image<V,Alloc>::coord_t' to 'int', possible loss of data (visual studio compiler doesn't realize that the two types are the same)
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//#endif
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////////////////////////////////////////////////////////////////////////////////////////
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/// \ingroup ImageModel PixelBasedModel
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/// \brief container interface over image view. Models ImageConcept, PixelBasedConcept
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///
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/// A 2D container whose elements are pixels. It is templated over the pixel type, a boolean
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/// indicating whether it should be planar, and an optional allocator.
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///
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/// Note that its element type does not have to be a pixel. \p image can be instantiated with any Regular element,
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/// in which case it models the weaker RandomAccess2DImageConcept and does not model PixelBasedConcept
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///
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////////////////////////////////////////////////////////////////////////////////////////
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template< typename Pixel, bool IsPlanar = false, typename Alloc=std::allocator<unsigned char> >
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class image {
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public:
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typedef typename Alloc::template rebind<unsigned char>::other allocator_type;
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typedef typename view_type_from_pixel<Pixel, IsPlanar>::type view_t;
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typedef typename view_t::const_t const_view_t;
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typedef typename view_t::point_t point_t;
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typedef typename view_t::coord_t coord_t;
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typedef typename view_t::value_type value_type;
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typedef coord_t x_coord_t;
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typedef coord_t y_coord_t;
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const point_t& dimensions() const { return _view.dimensions(); }
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x_coord_t width() const { return _view.width(); }
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y_coord_t height() const { return _view.height(); }
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explicit image(std::size_t alignment=0,
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const Alloc alloc_in = Alloc()) :
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_memory(0), _align_in_bytes(alignment), _alloc(alloc_in) {}
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// Create with dimensions and optional initial value and alignment
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image(const point_t& dimensions,
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std::size_t alignment=0,
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const Alloc alloc_in = Alloc()) : _memory(0), _align_in_bytes(alignment), _alloc(alloc_in) {
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allocate_and_default_construct(dimensions);
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}
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image(x_coord_t width, y_coord_t height,
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std::size_t alignment=0,
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const Alloc alloc_in = Alloc()) : _memory(0), _align_in_bytes(alignment), _alloc(alloc_in) {
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allocate_and_default_construct(point_t(width,height));
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}
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image(const point_t& dimensions,
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const Pixel& p_in,
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std::size_t alignment,
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const Alloc alloc_in = Alloc()) :
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_memory(0), _align_in_bytes(alignment), _alloc(alloc_in) {
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allocate_and_fill(dimensions, p_in);
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}
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image(x_coord_t width, y_coord_t height,
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const Pixel& p_in,
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std::size_t alignment,
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const Alloc alloc_in = Alloc()) :
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_memory(0), _align_in_bytes(alignment), _alloc(alloc_in) {
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allocate_and_fill(point_t(width,height),p_in);
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}
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image(const image& img) :
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_memory(0), _align_in_bytes(img._align_in_bytes), _alloc(img._alloc) {
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allocate_and_copy(img.dimensions(),img._view);
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}
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template <typename P2, bool IP2, typename Alloc2>
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image(const image<P2,IP2,Alloc2>& img) :
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_memory(0), _align_in_bytes(img._align_in_bytes), _alloc(img._alloc) {
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allocate_and_copy(img.dimensions(),img._view);
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}
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image& operator=(const image& img) {
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if (dimensions() == img.dimensions())
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copy_pixels(img._view,_view);
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else {
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image tmp(img);
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swap(tmp);
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}
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return *this;
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}
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template <typename Img>
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image& operator=(const Img& img) {
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if (dimensions() == img.dimensions())
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copy_pixels(img._view,_view);
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else {
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image tmp(img);
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swap(tmp);
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}
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return *this;
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}
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~image() {
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destruct_pixels(_view);
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deallocate(_view.dimensions());
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}
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Alloc& allocator() { return _alloc; }
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Alloc const& allocator() const { return _alloc; }
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void swap(image& img) { // required by MutableContainerConcept
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using std::swap;
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swap(_align_in_bytes, img._align_in_bytes);
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swap(_memory, img._memory);
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swap(_view, img._view);
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swap(_alloc, img._alloc);
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}
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void recreate(const point_t& dims, std::size_t alignment=0, const Alloc alloc_in = Alloc()) {
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if (dims!=_view.dimensions() || _align_in_bytes!=alignment || alloc_in!=_alloc) {
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image tmp(dims, alignment, alloc_in);
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swap(tmp);
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}
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}
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void recreate(x_coord_t width, y_coord_t height, std::size_t alignment=0, const Alloc alloc_in = Alloc()) {
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recreate(point_t(width,height),alignment,alloc_in);
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}
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void recreate(const point_t& dims,
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const Pixel& p_in, std::size_t alignment, const Alloc alloc_in = Alloc()) {
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if (dims!=_view.dimensions() || _align_in_bytes!=alignment || alloc_in!=_alloc) {
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image tmp(dims, p_in, alignment, alloc_in);
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swap(tmp);
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}
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}
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void recreate(x_coord_t width, y_coord_t height,
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const Pixel& p_in, std::size_t alignment, const Alloc alloc_in = Alloc()) {
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recreate(point_t(width,height),p_in,alignment,alloc_in);
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}
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view_t _view; // contains pointer to the pixels, the image size and ways to navigate pixels
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private:
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unsigned char* _memory;
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std::size_t _align_in_bytes;
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allocator_type _alloc;
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void allocate_and_default_construct(const point_t& dimensions) {
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try {
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allocate_(dimensions,mpl::bool_<IsPlanar>());
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default_construct_pixels(_view);
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} catch(...) { deallocate(dimensions); throw; }
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}
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void allocate_and_fill(const point_t& dimensions, const Pixel& p_in) {
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try {
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allocate_(dimensions,mpl::bool_<IsPlanar>());
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uninitialized_fill_pixels(_view, p_in);
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} catch(...) { deallocate(dimensions); throw; }
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}
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template <typename View>
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void allocate_and_copy(const point_t& dimensions, const View& v) {
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try {
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allocate_(dimensions,mpl::bool_<IsPlanar>());
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uninitialized_copy_pixels(v,_view);
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} catch(...) { deallocate(dimensions); throw; }
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}
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void deallocate(const point_t& dimensions) {
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if (_memory) _alloc.deallocate(_memory, total_allocated_size_in_bytes(dimensions));
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}
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std::size_t total_allocated_size_in_bytes(const point_t& dimensions) const {
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typedef typename view_t::x_iterator x_iterator;
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// when value_type is a non-pixel, like int or float, num_channels< ... > doesn't work.
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const std::size_t _channels_in_image = mpl::eval_if< is_pixel< value_type >
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, num_channels< view_t >
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, mpl::int_< 1 >
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>::type::value;
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std::size_t size_in_units = get_row_size_in_memunits(dimensions.x)*dimensions.y;
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if (IsPlanar)
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size_in_units = size_in_units * _channels_in_image ;
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// return the size rounded up to the nearest byte
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return ( size_in_units + byte_to_memunit< x_iterator >::value - 1 )
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/ byte_to_memunit<x_iterator>::value
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+ ( _align_in_bytes > 0 ? _align_in_bytes - 1 : 0 ); // add extra padding in case we need to align the first image pixel
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}
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std::size_t get_row_size_in_memunits(x_coord_t width) const { // number of units per row
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std::size_t size_in_memunits = width*memunit_step(typename view_t::x_iterator());
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if (_align_in_bytes>0) {
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std::size_t alignment_in_memunits=_align_in_bytes*byte_to_memunit<typename view_t::x_iterator>::value;
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return align(size_in_memunits, alignment_in_memunits);
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}
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return size_in_memunits;
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}
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void allocate_(const point_t& dimensions, mpl::false_) { // if it throws and _memory!=0 the client must deallocate _memory
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_memory=_alloc.allocate(total_allocated_size_in_bytes(dimensions));
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unsigned char* tmp=(_align_in_bytes>0) ? (unsigned char*)align((std::size_t)_memory,_align_in_bytes) : _memory;
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_view=view_t(dimensions,typename view_t::locator(typename view_t::x_iterator(tmp),get_row_size_in_memunits(dimensions.x)));
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}
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void allocate_(const point_t& dimensions, mpl::true_) { // if it throws and _memory!=0 the client must deallocate _memory
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std::size_t row_size=get_row_size_in_memunits(dimensions.x);
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std::size_t plane_size=row_size*dimensions.y;
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_memory=_alloc.allocate(total_allocated_size_in_bytes(dimensions));
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unsigned char* tmp=(_align_in_bytes>0) ? (unsigned char*)align((std::size_t)_memory,_align_in_bytes) : _memory;
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typename view_t::x_iterator first;
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for (int i=0; i<num_channels<view_t>::value; ++i) {
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dynamic_at_c(first,i) = (typename channel_type<view_t>::type*)tmp;
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memunit_advance(dynamic_at_c(first,i), plane_size*i);
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}
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_view=view_t(dimensions, typename view_t::locator(first, row_size));
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}
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};
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template <typename Pixel, bool IsPlanar, typename Alloc>
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void swap(image<Pixel, IsPlanar, Alloc>& im1,image<Pixel, IsPlanar, Alloc>& im2) {
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im1.swap(im2);
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}
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template <typename Pixel1, bool IsPlanar1, typename Alloc1, typename Pixel2, bool IsPlanar2, typename Alloc2>
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bool operator==(const image<Pixel1,IsPlanar1,Alloc1>& im1,const image<Pixel2,IsPlanar2,Alloc2>& im2) {
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if ((void*)(&im1)==(void*)(&im2)) return true;
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if (const_view(im1).dimensions()!=const_view(im2).dimensions()) return false;
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return equal_pixels(const_view(im1),const_view(im2));
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}
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template <typename Pixel1, bool IsPlanar1, typename Alloc1, typename Pixel2, bool IsPlanar2, typename Alloc2>
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bool operator!=(const image<Pixel1,IsPlanar1,Alloc1>& im1,const image<Pixel2,IsPlanar2,Alloc2>& im2) {return !(im1==im2);}
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///@{
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/// \name view, const_view
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/// \brief Get an image view from an image
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/// \ingroup ImageModel
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/// \brief Returns the non-constant-pixel view of an image
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template <typename Pixel, bool IsPlanar, typename Alloc> inline
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const typename image<Pixel,IsPlanar,Alloc>::view_t& view(image<Pixel,IsPlanar,Alloc>& img) { return img._view; }
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/// \brief Returns the constant-pixel view of an image
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template <typename Pixel, bool IsPlanar, typename Alloc> inline
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const typename image<Pixel,IsPlanar,Alloc>::const_view_t const_view(const image<Pixel,IsPlanar,Alloc>& img) {
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return static_cast<const typename image<Pixel,IsPlanar,Alloc>::const_view_t>(img._view);
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}
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///@}
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/////////////////////////////
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// PixelBasedConcept
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/////////////////////////////
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template <typename Pixel, bool IsPlanar, typename Alloc>
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struct channel_type<image<Pixel,IsPlanar,Alloc> > : public channel_type<Pixel> {};
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template <typename Pixel, bool IsPlanar, typename Alloc>
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struct color_space_type<image<Pixel,IsPlanar,Alloc> > : public color_space_type<Pixel> {};
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template <typename Pixel, bool IsPlanar, typename Alloc>
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struct channel_mapping_type<image<Pixel,IsPlanar,Alloc> > : public channel_mapping_type<Pixel> {};
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template <typename Pixel, bool IsPlanar, typename Alloc>
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struct is_planar<image<Pixel,IsPlanar,Alloc> > : public mpl::bool_<IsPlanar> {};
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//#ifdef _MSC_VER
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//#pragma warning(pop)
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//#endif
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} } // namespace boost::gil
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#endif
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