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WebSVN – planix.SVN – Blame – /os/branches/feature_posix/sys/src/libmemdraw/defont.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <memdraw.h>
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Memsubfont*
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getmemdefont(void)
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{
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	char *hdr, *p;
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	int n;
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	Fontchar *fc;
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	Memsubfont *f;
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	int ld;
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	Rectangle r;
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	Memdata *md;
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	Memimage *i;
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	/*
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	 * make sure data is word-aligned.  this is true with Plan 9 compilers
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	 * but not in general.  the byte order is right because the data is
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	 * declared as char*, not ulong*.
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	 */
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	p = (char*)defontdata;
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	n = (uintptr)p & 3;
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	if(n != 0){
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		memmove(p+(4-n), p, sizeofdefont-n);
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		p += 4-n;
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	}
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	ld = atoi(p+0*12);
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	r.min.x = atoi(p+1*12);
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	r.min.y = atoi(p+2*12);
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	r.max.x = atoi(p+3*12);
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	r.max.y = atoi(p+4*12);
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	md = mallocz(sizeof(Memdata), 1);
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	if(md == nil)
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		return nil;
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	p += 5*12;
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	md->base = nil;		/* so freememimage doesn't free p */
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	md->bdata = (uchar*)p;	/* ick */
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	md->ref = 1;
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	md->allocd = 1;		/* so freememimage does free md */
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	i = allocmemimaged(r, drawld2chan[ld], md);
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	if(i == nil){
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		free(md);
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		return nil;
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	}
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	hdr = p+Dy(r)*i->width*sizeof(ulong);
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	n = atoi(hdr);
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	p = hdr+3*12;
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	fc = malloc(sizeof(Fontchar)*(n+1));
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	if(fc == 0){
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		freememimage(i);
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		return 0;
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	}
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	_unpackinfo(fc, (uchar*)p, n);
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	f = allocmemsubfont("*default*", n, atoi(hdr+12), atoi(hdr+24), fc, i);
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	if(f == 0){
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		freememimage(i);
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		free(fc);
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		return 0;
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	}
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	return f;
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}