libs/gil/doc/html/_downloads/interleaved_ptr.cpp

   1 //
   2 // Copyright 2005-2007 Adobe Systems Incorporated
   3 //
   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
   7 //
   8 #ifdef WIN32
   9 #define _CRT_SECURE_NO_DEPRECATE 1
  10 #pragma warning(disable : 4244) //
  11 #pragma warning(disable : 4996) // MSFT declared it deprecated
  12 #endif
  13
  14 // Example file to demonstrate how to create a model of a pixel iterator
  15
  16 // FIXME: Review and remove if possible: gcc doesn't compile unless we forward-declare at_c before we include gil...
  17 namespace boost { namespace gil {
  18     template <typename ChannelReference, typename Layout> struct interleaved_ref;
  19     template <typename ColorBase> struct element_reference_type;
  20
  21     template <int K, typename ChannelReference, typename Layout>
  22     typename element_reference_type<interleaved_ref<ChannelReference,Layout>>::type
  23     at_c(const interleaved_ref<ChannelReference,Layout>& p);
  24 } }
  25
  26 #include <boost/gil.hpp>
  27 #include <boost/gil/extension/io/jpeg.hpp>
  28
  29 #include <iostream>
  30
  31 #include "interleaved_ptr.hpp"
  32
  33 int main(int argc, char* argv[])
  34 {
  35     using namespace boost::gil;
  36
  37     using rgb8_interleaved_ptr = interleaved_ptr<unsigned char*, rgb_layout_t>;
  38     using rgb8c_interleaved_ptr = interleaved_ptr<unsigned char const*, rgb_layout_t>;
  39
  40     boost::function_requires<MutablePixelIteratorConcept<rgb8_interleaved_ptr>>();
  41     boost::function_requires<PixelIteratorConcept<rgb8c_interleaved_ptr>>();
  42     boost::function_requires<MemoryBasedIteratorConcept<memory_based_step_iterator<rgb8_interleaved_ptr>> >();
  43
  44     boost::function_requires<MutablePixelConcept<rgb8_interleaved_ptr::value_type>>();
  45     boost::function_requires<PixelConcept<rgb8c_interleaved_ptr::value_type>>();
  46
  47     using rgb8_interleaved_view_t = type_from_x_iterator<rgb8_interleaved_ptr >::view_t;
  48     using rgb8c_interleaved_view_t = type_from_x_iterator<rgb8c_interleaved_ptr>::view_t;
  49
  50     boost::function_requires<MutableImageViewConcept<rgb8_interleaved_view_t>>();
  51     boost::function_requires<ImageViewConcept<rgb8c_interleaved_view_t>>();
  52
  53     rgb8_image_t img;
  54     read_image("test.jpg", img, jpeg_tag{});
  55
  56     // Get a raw pointer to the RGB buffer
  57     unsigned char* raw_ptr=&view(img)[0][0];
  58
  59     // Construct a view from it, without casting it to rgb8_pixel_t*
  60     rgb8_interleaved_view_t src_view=interleaved_view(img.width(),img.height(),rgb8_interleaved_ptr(raw_ptr),
  61                                                       view(img).pixels().row_size());
  62
  63     // Apply view transformations and algorithms on it
  64     write_view("out-interleaved_ptr.jpg",nth_channel_view(flipped_up_down_view(src_view),1), jpeg_tag{});
  65
  66     return 0;
  67 }
  68
  69