From e95cafa38851d2c39703b15aefe3798b02067470 Mon Sep 17 00:00:00 2001 From: Bill Spitzak Date: Sun, 6 Mar 2016 17:06:53 -0800 Subject: 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 Acked-by: Oded Gabbay --- pixman/pixman-filter.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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 }, -- cgit v1.2.3