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| author | Bill Spitzak <spitzak@gmail.com> | 2016-03-06 17:06:53 -0800 |
|---|---|---|
| committer | Søren Sandmann Pedersen <soren.sandmann@gmail.com> | 2016-03-11 00:00:46 -0500 |
| commit | e95cafa38851d2c39703b15aefe3798b02067470 (patch) | |
| tree | 1316fb66216154cb1ce4cbe161a6d48b9f59bb3e | |
| parent | 18e8f754cc26a92d437264bf2f47a70aa270b5bb (diff) | |
pixman-filter: Made Gaussian a bit wider
Expanded the size slightly (from ~4.25 to 5) to make the cutoff less noticable.
Previouly the value at the cutoff was gaussian_filter(sqrt(2)*3/2) = 0.00626
which is larger than the difference between 8-bit pixels (1/255 = 0.003921).
New cutoff is gaussian_filter(2.5) = 0.001089 which is smaller.
v11: added some math to commit message
v14: left SIGMA in there
Signed-off-by: Bill Spitzak <spitzak@gmail.com>
Acked-by: Oded Gabbay <oded.gabbay@gmail.com>
| -rw-r--r-- | pixman/pixman-filter.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/pixman/pixman-filter.c b/pixman/pixman-filter.c index eeee4b76..f582187a 100644 --- a/pixman/pixman-filter.c +++ b/pixman/pixman-filter.c @@ -143,7 +143,7 @@ static const filter_info_t filters[] = { PIXMAN_KERNEL_BOX, box_kernel, 1.0 }, { PIXMAN_KERNEL_LINEAR, linear_kernel, 2.0 }, { PIXMAN_KERNEL_CUBIC, cubic_kernel, 4.0 }, - { PIXMAN_KERNEL_GAUSSIAN, gaussian_kernel, 6 * SIGMA }, + { PIXMAN_KERNEL_GAUSSIAN, gaussian_kernel, 5.0 }, { PIXMAN_KERNEL_LANCZOS2, lanczos2_kernel, 4.0 }, { PIXMAN_KERNEL_LANCZOS3, lanczos3_kernel, 6.0 }, { PIXMAN_KERNEL_LANCZOS3_STRETCHED, nice_kernel, 8.0 }, |