Bug#490700: libhighgui-dev: Linking against libhighgui fails

[Jan Binder]

Here is a testcase for this bug.
Compile with:

g++  testcase.cpp `pkg-config --cflags-only-I opencv `\
 `pkg-config --libs-only-L opencv`\
 `pkg-config --libs-only-l opencv`\
 -o testcase

to reproduce.

Greetings,
Jan

#include <math.h>
#include "cv.h" // includes OpenCV definitions
#include "highgui.h" // includes highGUI definitions
#include <iostream> // includes C++ standard input/output definitions

using namespace std;

int main( int argc, char** argv ) {
	CvCapture* capture = 0;
	IplImage *frame, *frame_copy = 0;
	const char* input_name;

	input_name = argc > 1 ? argv[1] : 0;

	if( !input_name || (isdigit(input_name[0]) && input_name[1] == '\0') ){
		cout << "Capture from Camera! AAAAAAnd ACTION!" <<endl;
		capture = cvCaptureFromCAM( !input_name ? 0 : input_name[0] - '0' );
	}else{
		cout << "Capturing from AVI. Test mode."<<endl;
			capture = cvCaptureFromFile( input_name );
	}
	cvNamedWindow( "result", 1 );

	if( capture ) {
		for(;;) {
			if( !cvGrabFrame( capture )) {break;}
			frame = cvRetrieveFrame( capture );
			if( !frame ) {break;}
			if( !frame_copy ){
				frame_copy = cvCreateImage( cvSize(frame->width,frame->height),
				IPL_DEPTH_8U, frame->nChannels );
			}
			if( frame->origin == IPL_ORIGIN_TL ){
				cvCopy( frame, frame_copy, 0 );
			}else{
				cvFlip( frame, frame_copy, 0 );
			}
			cvShowImage( "result", frame_copy ); //Let the image be displayed
			if( cvWaitKey( 10 ) >= 0 ) {break;}
		}

		cvReleaseImage( &frame_copy );
		cvReleaseCapture( &capture );
	}else{
		cout << "Capturing from image. Lame."<<endl;
		const char* filename = input_name ? input_name : (char*)"redline.jpg";
		IplImage* image = cvLoadImage( filename, 1 );

		if( image ){
			cvShowImage( "result", image ); //Let the image be displayed
			cvWaitKey(0);
			cvReleaseImage( &image );
		}else{
			cout << "No valid input. Use ./testcase [Cam|Video|Picture] " <<endl;
		}
	}
	cvDestroyWindow("result");
	return 0;
}