* src/base/ftlcdfil.c (FT_SHIFTCLAMP): Cancel clamping.

Without clamping, we might get garbage output for unnormalized weights. So what? Garbage in, garbage out - but filtering becomes noticeably faster.
2022-11-23 04:12:08 +00:00 · 2022-11-23 04:12:08 +00:00 · 6e4012550c
parent aca4ec5907
commit 6e4012550c
1 changed files with 5 additions and 0 deletions
--- a/src/base/ftlcdfil.c
+++ b/src/base/ftlcdfil.c
@ -28,7 +28,12 @@
 /* define USE_LEGACY to implement the legacy filter */
 #define  USE_LEGACY

+#if 1
+#define FT_SHIFTCLAMP( x )  (FT_Byte)( x >> 8 )
+#else
 #define FT_SHIFTCLAMP( x )  ( x >>= 8, (FT_Byte)( x > 255 ? 255 : x ) )
+#endif
+


  /* add padding according to filter weights */