colors

commit fd4989bb968aa7d72440cf2d2709e990ea0de272
parent e980a0e445c08a18ae5a79a02ffd2e0d38f4d2d1
Author: sin <sin@2f30.org>
Date:   Sat,  6 Jun 2015 12:11:56 +0100

No need to use sqrtf() in distance()

This halves the processing time for large pictures.

Diffstat:
M
Makefile
 | 
2
+-
M
colors.c
 | 
3
+--

2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/Makefile b/Makefile
@@ -5,7 +5,7 @@ MANPREFIX = $(PREFIX)/man
 
 CPPFLAGS = -I/usr/local/include
 CFLAGS = -Wall -O3
-LDFLAGS = -L/usr/local/lib -lm -lpng
+LDFLAGS = -L/usr/local/lib -lpng
 OBJ = colors.o png.o
 BIN = colors
 
diff --git a/colors.c b/colors.c
@@ -2,7 +2,6 @@
 #include <err.h>
 #include <errno.h>
 #include <limits.h>
-#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
@@ -43,7 +42,7 @@ distance(struct point *p1, struct point *p2)
 	dx = (p1->x - p2->x) * (p1->x - p2->x);
 	dy = (p1->y - p2->y) * (p1->y - p2->y);
 	dz = (p1->z - p2->z) * (p1->z - p2->z);
-	return sqrtf(dx + dy + dz) + 0.5f;
+	return dx + dy + dz;
 }
 
 void