From 9f9dadf7f474b6fd5940cbc6f2e299c739601af2 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Tue, 27 Apr 2021 11:35:18 +0200
Subject: Swap the order of iteration in filters.c

This code hasn't been looked at for a very long time, and can be made a
bit faster by iterating in a more cache-friendly way.
---
 libcrystfel/src/filters.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

(limited to 'libcrystfel')

diff --git a/libcrystfel/src/filters.c b/libcrystfel/src/filters.c
index 9d01bac3..e5c8a136 100644
--- a/libcrystfel/src/filters.c
+++ b/libcrystfel/src/filters.c
@@ -47,8 +47,8 @@ static void filter_noise_in_panel(float *data, int width, int height)
 {
 	int x, y;
 
-	for ( x=0; x<width; x++ ) {
 	for ( y=0; y<height; y++ ) {
+	for ( x=0; x<width; x++ ) {
 
 		int dx, dy;
 		float val = data[x+width*y];
@@ -61,8 +61,8 @@ static void filter_noise_in_panel(float *data, int width, int height)
 			continue;
 		}
 
-		for ( dx=-1; dx<=+1; dx++ ) {
 		for ( dy=-1; dy<=+1; dy++ ) {
+		for ( dx=-1; dx<=+1; dx++ ) {
 
 			int val2;
 
@@ -164,16 +164,16 @@ void filter_median(struct image *image, int size)
 			return;
 		}
 
-		for ( fs=0; fs<p->w; fs++ ) {
 		for ( ss=0; ss<p->h; ss++ ) {
+		for ( fs=0; fs<p->w; fs++ ) {
 
 			int ifs, iss;
 
 			counter = 0;
 
 			// Loop over median window
-			for ( ifs=-size; ifs<=size; ifs++ ) {
 			for ( iss=-size; iss<=size; iss++ ) {
+			for ( ifs=-size; ifs<=size; ifs++ ) {
 
 				int idx;
 
-- 
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