/**
 * \file qfont_metrics.C
 * Copyright 1995-2002 the LyX Team
 * Read the file COPYING
 *
 * \author unknown
 * \author John Levon <moz@compsoc.man.ac.uk>
 */

#include <config.h>


#ifdef __GNUG__
#pragma implementation "frontends/font_metrics.h"
#endif

#include "support/lstrings.h"
#include "font_metrics.h"
#include "qfont_loader.h"
#include "debug.h"

#include <qfontmetrics.h>
#include <qfont.h>

// FIXME ?
extern qfont_loader * global_fontloader;
 
namespace {
	QFontMetrics const & metrics(LyXFont const & f) {
		return global_fontloader->metrics(f);
	}
};

 
namespace font_metrics {
 
int maxAscent(LyXFont const & f)
{
	return metrics(f).ascent();
}


int maxDescent(LyXFont const & f)
{
	return metrics(f).descent();
}


int ascent(char c, LyXFont const & f)
{
	// FIXME - must do ascent for char not maxascent
	//QRect r = metrics(f).boundingRect(c);
	//lyxerr << r.x() << "," << r.y() <<
	//	" : " << r.width() << "," << r.height() << endl;
	return metrics(f).ascent();
}


int descent(char, LyXFont const & f)
{
	// FIXME
	return metrics(f).descent();
}


int lbearing(char c, LyXFont const & f)
{
	return metrics(f).leftBearing(c);
}


int rbearing(char c, LyXFont const & f)
{
	return metrics(f).rightBearing(c);
}


int width(char const * s, size_t ls, LyXFont const & f)
{
	if (f.realShape() != LyXFont::SMALLCAPS_SHAPE) {
		return metrics(f).width(s, ls);
	}

	// handle small caps ourselves ...
 
	LyXFont smallfont(f);
	smallfont.decSize().decSize().setShape(LyXFont::UP_SHAPE);

	QFontMetrics qm = global_fontloader->metrics(f);
	QFontMetrics qsmallm = global_fontloader->metrics(smallfont);

	int w = 0;

	for (size_t i = 0; i < ls; ++i) {
		char const c = uppercase(s[i]);
		if (c != s[i])
			w += qsmallm.width(&c, 1);
		else
			w += qm.width(&c, 1);
	}
	return w;
}


int signedWidth(string const & s, LyXFont const & f)
{
	if (s[0] == '-')
		return -width(s.substr(1, s.length() - 1), f);
	else
		return width(s, f);
}


void rectText(string const & str, LyXFont const & f,
	int & w,
	int & ascent, 
	int & descent)
{
	QFontMetrics const & metrics(metrics(f));
 
	w = width(str, f);
	ascent = metrics.ascent();
	descent = metrics.descent();
}



void buttonText(string const & str, LyXFont const & f,
	int & w, 
	int & ascent, 
	int & descent)
{
	QFontMetrics const & metrics(metrics(f));
 
	static int const d = 3;
	
	w = width(str, f) + d * 2 + 2;
	ascent = metrics.ascent() + d;
	descent = metrics.descent() + d;
}

} // namespace font_metrics