From a7357c57579c582a10003d005e9e5eb36100b85a Mon Sep 17 00:00:00 2001
From: Lovell Fuller <github@lovell.info>
Date: Sun, 19 Jul 2020 15:29:03 +0100
Subject: [PATCH] Perf: improve conversion to LCH by ~30%, avoid costly atan2

---
 libvips/colour/Lab2LCh.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/libvips/colour/Lab2LCh.c b/libvips/colour/Lab2LCh.c
index 9dccb587..7453a397 100644
--- a/libvips/colour/Lab2LCh.c
+++ b/libvips/colour/Lab2LCh.c
@@ -63,11 +63,6 @@ vips_col_ab2h( double a, double b )
 {
 	double h;
 
-#ifdef HAVE_ATAN2
-	h = VIPS_DEG( atan2( b, a ) );
-	if( h < 0.0 )
-		h += 360;
-#else
 	/* We have to get the right quadrant!
 	 */
 	if( a == 0 ) {
@@ -89,7 +84,6 @@ vips_col_ab2h( double a, double b )
 		else
 			h = VIPS_DEG( t + VIPS_PI );
 	}
-#endif
 
 	return( h );
 }
@@ -97,13 +91,7 @@ vips_col_ab2h( double a, double b )
 void
 vips_col_ab2Ch( float a, float b, float *C, float *h )
 {
-#ifdef HAVE_ATAN2
-	*h = VIPS_DEG( atan2( b, a ) );
-	if( *h < 0.0 )
-		*h += 360;
-#else
 	*h = vips_col_ab2h( a, b ); 
-#endif 
 
 #ifdef HAVE_HYPOT
 	*C = hypot( a, b );