diff options
Diffstat (limited to 'draw/draw_scale.c')
| -rw-r--r-- | draw/draw_scale.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/draw/draw_scale.c b/draw/draw_scale.c index b2e28b7b..489a2eb9 100644 --- a/draw/draw_scale.c +++ b/draw/draw_scale.c @@ -347,22 +347,28 @@ add_weight(fz_weights *weights, int j, int i, fz_scale_filter *filter, dist = -dist; f = filter->fn(filter, dist)*F; weight = (int)(256*f+0.5f); - if (weight == 0) - return; /* Ensure i is in range */ if (i < 0) { i = 0; - weight = 0; + return; } else if (i >= src_w) { i = src_w-1; - weight = 0; + return; } if (weight == 0) - return; + { + /* We add a fudge factor here to allow for extreme downscales + * where all the weights round to 0. Ensure that at least one + * (arbitrarily the first one) is non zero. */ + if (weights->new_line && f > 0) + weight = 1; + else + return; + } DBUG(("add_weight[%d][%d] = %d(%g) dist=%g\n",j,i,weight,f,dist)); |