filter_kernels: add ewa_lanczos4sharpest

Mainly for vo_gpu_next.

1 files changed, 6 insertions, 0 deletions

diff --git a/video/out/filter_kernels.c b/video/out/filter_kernels.c
index 78413bc35e..edd2afe6cd 100644
--- a/video/out/filter_kernels.c
+++ b/video/out/filter_kernels.c
@@ -363,6 +363,7 @@ const struct filter_window mp_filter_windows[] = {
 };
 
 #define JINC_R3 3.2383154841662362
+#define JINC_R4 4.2410628637960699
 
 const struct filter_kernel mp_filter_kernels[] = {
     // Spline filters
@@ -382,6 +383,11 @@ const struct filter_kernel mp_filter_kernels[] = {
     // preserve horizontal/vertical lines)
     {{"ewa_lanczossharp", JINC_R3, jinc, .blur = 0.9812505837223707, .resizable = true},
         .polar = true, .window = "jinc"},
+    // Similar to the above, but sharpened substantially to the point of
+    // minimizing the total impulse response error on an integer grid. Tends
+    // to preserve hash patterns well. Very sharp but rings a lot.
+    {{"ewa_lanczos4sharpest", JINC_R4, jinc, .blur = 0.8845120932605005, .resizable = true},
+        .polar = true, .window = "jinc"},
     // Similar to the above, but softened instead, to make even/odd integer
     // contributions exactly symmetrical. Designed to smooth out hash patterns.
     {{"ewa_lanczossoft", JINC_R3, jinc, .blur = 1.0164667662867047, .resizable = true},