reduce: prefer use of VIPS_FABS() (libvips#4243)

To ensure we handle negative zero (-0.0) correctly. (cherry picked from commit 852fd7c)
kleisauke · Nov 4, 2024 · d91f7b0 · d91f7b0
1 parent 9fe7ac3
commit d91f7b0
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/libvips/resample/templates.h b/libvips/resample/templates.h
@@ -361,8 +361,7 @@ static double inline filter(double x);
 template <>
 double inline filter<VIPS_KERNEL_LINEAR>(double x)
 {
-	if (x < 0.0)
-		x = -x;
+	x = VIPS_FABS(x);
 
 	if (x < 1.0)
 		return 1.0 - x;