//
// Program to demonstrate the visual effect of APT compression.
//
// Usage: apttest inpic
//
// John Robinson
// 2004
#include "picture.h"
#include "usage.h"
	
int filesize(const char *filename) {
// Returns size in bytes of given file
	ifstream f(filename,ios::binary);
	f.seekg(0,istream::end);
	int retval = f.tellg();
	f.close();
	return retval;
	}
int main(int argc, char *argv[]) {
	usage("apttest inpic");
	colour_picture in(argv[1]);
	colour_picture out(in);
	int origbits = filesize(argv[1]) * 8;
	const int numpels(in.nrows()*in.ncols());
	char caption[256];
	sprintf(caption,"Input at %f bits per pel",(double)origbits/numpels);
	in.show(caption);
	int quality = 85;
	parampic qualitycontrol(0,100,85,"Quality parameter");
	in.aptwrite("temppic",quality);
	out.read("temppic");
	int compbits = filesize("temppic") * 8;
	sprintf(caption,"Output at %f bits per pel",(double)compbits/numpels);
	out.show(caption);
	while(!in.closerequested() && !out.closerequested()) {
		// Let the user adjust the quality parameter and see the result
		double dq;
		if (!qualitycontrol.X(dq))
			continue;
		quality = (int) dq;
		in.aptwrite("temppic",quality);
		out.read("temppic");
		compbits = filesize("temppic") * 8;
		sprintf(caption,"Output at %f bits per pel",(double)compbits/numpels);
		out.reshow(caption);
		}
	return 1;
	}