/**
 ** convfont.c ---- build a converted font from an already loaded (linked) one
 **
 ** Copyright (c) 1995 Csaba Biegl, 820 Stirrup Dr, Nashville, TN 37221
 ** [e-mail: csaba@vuse.vanderbilt.edu]
 **
 ** This file is part of the GRX graphics library.
 **
 ** The GRX graphics library is free software; you can redistribute it
 ** and/or modify it under some conditions; see the "copying.grx" file
 ** for details.
 **
 ** This library is distributed in the hope that it will be useful,
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 **
 **/

#include "libgrx.h"
#include "grfontdv.h"
#include "arith.h"

static const GrFont *cvfont;

static int charwdt(int chr)
{
	chr -= cvfont->h.minchar;
	if((unsigned int)chr >= cvfont->h.numchars) return(-1);
	return(cvfont->chrinfo[chr].width);
}

static int bitmap(int chr,int w,int h,char *buffer)
{
	chr -= cvfont->h.minchar;
	if((unsigned int)chr >= cvfont->h.numchars)       return(FALSE);
	if((unsigned int)w != cvfont->chrinfo[chr].width) return(FALSE);
	if((unsigned int)h != cvfont->h.height)           return(FALSE);
	memcpy(
	    buffer,
	    &cvfont->bitmap[cvfont->chrinfo[chr].offset],
	    ((w + 7) >> 3) * h
	);
	return(TRUE);
}

GrFont *GrBuildConvertedFont(const GrFont *from,int cvt,int w,int h,int minch,int maxch)
{
	cvfont = from;
	if(!cvfont) return(NULL);
	return(_GrBuildFont(&from->h,cvt,w,h,minch,maxch,charwdt,bitmap,FALSE));
}