test_endian.cpp

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#include "boost/endian/conversion.hpp"
#include <boost/make_shared.hpp>
#include <cv_bridge/cv_bridge.h>
#include <gtest/gtest.h>

TEST(CvBridgeTest, endianness)
{
  using namespace boost::endian;

  // Create an image of the type opposite to the platform
  sensor_msgs::Image msg;
  msg.height = 1;
  msg.width = 1;
  msg.encoding = "32SC2";
  msg.step = 8;

  msg.data.resize(msg.step);
  int32_t* data = reinterpret_cast<int32_t*>(&msg.data[0]);

  // Write 1 and 2 in order, but with an endianness opposite to the platform
  if (order::native == order::little)
  {
    msg.is_bigendian = true;
    *(data++) = native_to_big(static_cast<int32_t>(1));
    *data = native_to_big(static_cast<int32_t>(2));
  } else {
    msg.is_bigendian = false;
    *(data++) = native_to_little(static_cast<int32_t>(1));
    *data = native_to_little(static_cast<int32_t>(2));
  }

  // Make sure the values are still the same
  cv_bridge::CvImageConstPtr img = cv_bridge::toCvShare(boost::make_shared<sensor_msgs::Image>(msg));
  EXPECT_EQ(img->image.at<cv::Vec2i>(0, 0)[0], 1);
  EXPECT_EQ(img->image.at<cv::Vec2i>(0, 0)[1], 2);
  // Make sure we cannot share data
  EXPECT_NE(img->image.data, &msg.data[0]);
}