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/*
* compile with:
*
* g++ -g -Wall uhdr.cpp `pkg-config vips-cpp --cflags --libs`
*
* run with:
*
* ./a.out test/test-suite/images/ultra-hdr.jpg x.jpg
*
*/
#include <vips/vips8>
using namespace vips;
int
main(int argc, char **argv)
{
if (VIPS_INIT(argv[0]))
vips_error_exit(NULL);
if (argc != 3)
vips_error_exit("usage: %s infile outfile", argv[0]);
int left = 60;
int top = 1560;
int width = 128;
int height = 128;
VImage in = VImage::new_from_file(argv[1],
VImage::option()->set("access", VIPS_ACCESS_SEQUENTIAL));
VImage out = in.crop(left, top, width, height);
// also crop the gainmap, if there is one
VImage gainmap = out.gainmap();
if (!gainmap.is_null()) {
// the gainmap can be smaller than the image, we must scale the
// crop area
double hscale = (double) gainmap.width() / in.width();
double vscale = (double) gainmap.height() / in.height();
VImage x = gainmap.crop(left * hscale, top * vscale,
width * hscale, height * vscale);
// .set() modifies the image, so we need to make a unique
// copy ... you can skip this step if you know your image is
// already unique
out = out.copy();
// update the gainmap
out.set("gainmap", x);
}
out.write_to_file(argv[2]);
vips_shutdown();
return 0;
}
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