ceph/src/boost/libs/gil/example/affine.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 #include <boost/gil.hpp>
   9 #include <boost/gil/extension/io/jpeg.hpp>
  10 #include <boost/gil/extension/numeric/sampler.hpp>
  11 #include <boost/gil/extension/numeric/resample.hpp>
  12
  13 // Example for resample_pixels() in the numeric extension
  14
  15 int main()
  16 {
  17     namespace gil = boost::gil;
  18
  19     gil::rgb8_image_t img;
  20     gil::read_image("test.jpg", img, gil::jpeg_tag());
  21
  22     // test resample_pixels
  23     // Transform the image by an arbitrary affine transformation using nearest-neighbor resampling
  24     gil::rgb8_image_t transf(gil::rgb8_image_t::point_t(gil::view(img).dimensions() * 2));
  25     gil::fill_pixels(gil::view(transf), gil::rgb8_pixel_t(255, 0, 0)); // the background is red
  26
  27     gil::matrix3x2<double> mat =
  28         gil::matrix3x2<double>::get_translate(-gil::point<double>(200,250)) *
  29         gil::matrix3x2<double>::get_rotate(-15*3.14/180.0);
  30     gil::resample_pixels(const_view(img), gil::view(transf), mat, gil::nearest_neighbor_sampler());
  31     gil::write_view("out-affine.jpg", gil::view(transf), gil::jpeg_tag());
  32
  33     return 0;
  34 }