Ticket #1377: test_read_tiff_rgba.cpp

/******************************************************************************
 * __LICENCE_BEGIN__
 *
 * __LICENCE_END__
 *****************************************************************************/

///@file
///@brief Test that RGBA images are detected by the TIFF reader.
///
///@author john.femiani@asu.edu
///
///

#include <boost/test/unit_test.hpp>

#include <boost/gil/gil_all.hpp>
#include <boost/gil/extension/io/tiff_io.hpp>

namespace gil = boost::gil;

BOOST_AUTO_TEST_CASE(test_tiff_read_rgba8_image){
    gil::rgba8_image_t rgb;
    ::boost::gil::tiff_read_image("images/rgba.tif", rgb);

    BOOST_CHECK_MESSAGE(rgb.width() == 86,
                        "rgb.width() == 86 failed: Was " << rgb.width());
    BOOST_CHECK_MESSAGE(rgb.height() == 64,
                        "rgb.height() == 64 failed: Was " << rgb.width());

    for (int y = 0; y < rgb.height(); ++y){
        for (int x = 0; x < rgb.width(); ++x){
             gil::rgba8_pixel_t pix = view(rgb)(x,y);
             BOOST_REQUIRE_MESSAGE(pix == gil::rgba8_pixel_t(128,128,128,255),
                                   "pix!=128,128,128,255 found pix=" <<
                                   (int)pix[0] << "," <<
                                   (int)pix[1] << "," <<
                                   (int)pix[2] << "," <<
                                   (int)pix[3] <<
                                   " at x="<<x<<", y=" << y << ".");
         }
    }

}

BOOST_AUTO_TEST_CASE(test_tiff_read_rgb8_image_fails_on_rgba){

    try {
        gil::rgb8_image_t rgb;
        ::boost::gil::tiff_read_image("images/rgba.tif", rgb);
        BOOST_FAIL("Reading an rgb image from an rgba tif should fail.");
    } catch (std::ios_base::failure& err ){
        //Good, we should have an io error!
    }
}