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readtif: simplify rounding in other places

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ppatience0 2013-07-20 18:19:20 -04:00
parent 171db68c3d
commit 61c82d2bb8
1 changed files with 5 additions and 11 deletions
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16
sys/src/cmd/jpg/readtif.c
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@ -1210,16 +1210,14 @@ lzwstrip(Lzw *l, uchar *data, ulong size, ulong *i, long striplen)
static uchar *
lzw(Tif *t)
{
ulong i, j, size, r, dy, n;
ulong i, j, size, r, dy;
long striplen;
uchar *data;
Lzw l;
Code *p, *q;
int (*predict)(Tif *, uchar *, ulong);
n = t->dx * t->dy * t->depth;
n = n%8 == 0? n/8: n/8+1;
size = n * sizeof *data;
size = ((t->dx*t->dy*t->depth + 7) / 8) * sizeof *data;
if((data = malloc(size)) == nil) {
free(t->data);
return nil;
@ -1239,8 +1237,7 @@ lzw(Tif *t)
else
l.next = t->ndata;
r = dy < t->rows? dy: t->rows;
n = t->dx * r * t->depth;
striplen = n%8 == 0? n/8: n/8+1;
striplen = (t->dx*r*t->depth + 7) / 8;
if(lzwstrip(&l, data, size, &j, striplen) < 0)
break;
dy -= t->rows;
@ -1280,9 +1277,7 @@ packbits(Tif *t)
ulong i, j, k, size;
uchar *data;
i = t->dx * t->dy * t->depth;
i = i%8 == 0? i/8: i/8+1;
size = i * sizeof *data;
size = ((t->dx*t->dy*t->depth + 7) / 8) * sizeof *data;
if((data = malloc(size)) == nil) {
free(t->data);
return nil;
@ -1671,8 +1666,7 @@ checkfields(Tif *t)
if(t->counts == nil && t->comp == Nocomp &&
t->nstrips == 1 &&
(t->counts = malloc(size)) != nil) {
n = t->dx * t->dy * t->depth;
t->counts[0] = n%8 == 0? n/8: n/8+1;
t->counts[0] = (t->dx*t->dy*t->depth + 7) / 8;
t->ncounts = t->nstrips;
}
if(t->counts == nil || t->ncounts != t->nstrips) {