core/vil/vil_crop.cxx Source File

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00001 // This is core/vil/vil_crop.cxx
00002 #ifdef VCL_NEEDS_PRAGMA_INTERFACE
00003 #pragma implementation
00004 #endif
00005 //:
00006 // \file
00007 // \author Ian Scott.
00008 //
00009 //-----------------------------------------------------------------------------
00010 
00011 #include "vil_crop.h"
00012 #include <vcl_cassert.h>
00013 #include <vil/vil_exception.h>
00014 
00015 
00016 vil_image_resource_sptr vil_crop(const vil_image_resource_sptr &src, unsigned i0,
00017                                  unsigned n_i, unsigned j0, unsigned n_j)
00018 {
00019   return new vil_crop_image_resource(src, i0, n_i, j0, n_j);
00020 }
00021 
00022 
00023 vil_crop_image_resource::vil_crop_image_resource(vil_image_resource_sptr const& gi,
00024                                                  unsigned i0, unsigned n_i,
00025                                                  unsigned j0, unsigned n_j):
00026   src_(gi),
00027   i0_(i0),
00028   ni_(n_i),
00029   j0_(j0),
00030   nj_(n_j)
00031 {
00032   assert (i0+n_i <= src_->ni() && j0 + n_j <= src_->nj());
00033 }
00034 
00035 vil_image_view_base_sptr vil_crop_image_resource::get_copy_view(unsigned i0, unsigned n_i,
00036                                                                 unsigned j0, unsigned n_j) const
00037 {
00038   if (i0 + n_i > ni() || j0 + n_j > nj())
00039   {
00040      vil_exception_warning(vil_exception_out_of_bounds(
00041         "vil_crop_image_resource::get_copy_view") );
00042     return 0;
00043   }
00044   return src_->get_copy_view(i0+i0_, n_i, j0+j0_, n_j);
00045 }
00046 
00047 vil_image_view_base_sptr vil_crop_image_resource::get_view(unsigned i0, unsigned n_i,
00048                                                            unsigned j0, unsigned n_j) const
00049 {
00050   if (i0 + n_i > ni() || j0 + n_j > nj())
00051   {
00052      vil_exception_warning(vil_exception_out_of_bounds(
00053         "vil_crop_image_resource::get_view") );
00054     return 0;
00055   }
00056   return src_->get_view(i0+i0_, n_i, j0+j0_, n_j);
00057 }