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| author | Bill Spitzak <spitzak@gmail.com> | 2016-08-30 22:03:15 -0700 |
|---|---|---|
| committer | Søren Sandmann Pedersen <soren.sandmann@gmail.com> | 2016-09-03 14:53:07 -0400 |
| commit | 17c4ce2e393af597db3c04295c21afc7ce34aa22 (patch) | |
| tree | 87f32aae4932b7280beaba5dca8c8f9e32b0fa39 | |
| parent | d286078b28bdef15aa0498e6e7ec7da68a42bfeb (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>
Reviewed-by: Søren Sandmann <soren.sandmann@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 3318893..5f3b752 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 }, |