tfontsrv: work around a few crashes - plan9port - [fork] Plan 9 from user space
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       ---
 (DIR) commit e19fde358468d55bc60664691978ae86c7641015
 (DIR) parent c6d1f20537c9bbe0a49e89f81d4b70368ba4172f
 (HTM) Author: Russ Cox <rsc@swtch.com>
       Date:   Sun, 25 Nov 2012 22:45:32 -0500
       
       fontsrv: work around a few crashes
       
       Probably not the right fix, but gets us going.
       
       R=rsc
       http://codereview.appspot.com/6782113
       
       Diffstat:
         M src/cmd/fontsrv/osx.c               |       8 ++++++--
       
       1 file changed, 6 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/src/cmd/fontsrv/osx.c b/src/cmd/fontsrv/osx.c
       t@@ -183,10 +183,10 @@ mksubfont(char *name, int lo, int hi, int size, int antialias)
                x = (int)(bbox.size.width * size / unit + 0.99999999);
                y = bbox.size.height * size/unit + 0.99999999;
                y0 = (int)(-bbox.origin.y * size/unit + 0.99999999);
       -        m = allocmemimage(Rect(0, 0, x*(hi+1-lo), y), GREY8);
       +        m = allocmemimage(Rect(0, 0, x*(hi+1-lo)+1, y+1), GREY8);
                if(m == nil)
                        return nil;
       -        mc = allocmemimage(Rect(0, 0, x, y), GREY8);
       +        mc = allocmemimage(Rect(0, 0, x+1, y+1), GREY8);
                if(mc == nil)
                        return nil;
                memfillcolor(m, DBlack);
       t@@ -272,6 +272,10 @@ mksubfont(char *name, int lo, int hi, int size, int antialias)
                // round up to 32-bit boundary
                // so that in-memory data is same
                // layout as in-file data.
       +        if(x == 0)
       +                x = 1;
       +        if(y == 0)
       +                y = 1;
                if(antialias)
                        x += -x & 3;
                else