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sna/trapezoids: Add paranoia to ensure that the span starts within the clip 

Reported-by: Clemens Eisserer <linuxhippy@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=47226
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-03-12 10:49:46 +00:00
parent 8136bc5e11
commit 7ae4558432
1 changed files with 11 additions and 8 deletions
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19
src/sna/sna_trapezoids.c
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@ -1538,16 +1538,19 @@ inplace_subrow(struct active_list *active, int8_t *row,
xstart = INT_MIN;
}
} else if (xstart < 0) {
grid_scaled_x_t fx;
int ix;
xstart = MAX(edge->x.quo, 0);
FAST_SAMPLES_X_TO_INT_FRAC(xstart, ix, fx);
if (ix < *min)
*min = ix;
if (xstart < FAST_SAMPLES_X * width) {
grid_scaled_x_t fx;
int ix;
row[ix++] += FAST_SAMPLES_X - fx;
row[ix] += fx;
FAST_SAMPLES_X_TO_INT_FRAC(xstart, ix, fx);
if (ix < *min)
*min = ix;
row[ix++] += FAST_SAMPLES_X - fx;
if (ix < width)
row[ix] += fx;
}
}
if (--edge->height_left) {