Added a key-mapping for toggle anti-aliasing

README.md

@@ -45,3 +45,4 @@ Use the following keys to control sxiv:
     <,>          Rotate image (counter-)clockwise by 90 degrees
     f            Toggle fullscreen mode (requires an EWMH/NetWM compliant
                  window manager)
+    a            Toggle anti-aliasing

image.c

@@ -33,8 +33,10 @@ void img_init(img_t *img, win_t *win) {
 	zoom_min = zoom_levels[0] / 100.0;
 	zoom_max = zoom_levels[zl_cnt - 1] / 100.0;
 
-	if (img)
+	if (img) {
 		img->zoom = 1.0;
+		img->aa = 1;
+	}
 
 	if (win) {
 		imlib_context_set_display(win->env.dpy);
@@ -63,6 +65,7 @@ int img_load(img_t *img, const char *filename) {
 	}
 
 	imlib_context_set_image(im);
+	imlib_context_set_anti_alias(img->aa);
 
 	img->re = 0;
 	img->checkpan = 0;
@@ -272,3 +275,13 @@ int img_rotate_left(img_t *img, win_t *win) {
 int img_rotate_right(img_t *img, win_t *win) {
 	return img_rotate(img, win, 1);
 }
+
+int img_toggle_antialias(img_t *img) {
+	if (!img)
+		return 0;
+
+	img->aa ^= 1;
+	imlib_context_set_anti_alias(img->aa);
+
+	return 1;
+}

image.h

@@ -39,6 +39,7 @@ typedef struct img_s {
 	unsigned char re;
 	unsigned char checkpan;
 	unsigned char zoomed;
+	unsigned char aa;
 	int x;
 	int y;
 	int w;
@@ -59,4 +60,6 @@ int img_pan(img_t*, win_t*, pandir_t);
 int img_rotate_left(img_t*, win_t*);
 int img_rotate_right(img_t*, win_t*);
 
+int img_toggle_antialias(img_t*);
+
 #endif /* IMAGE_H */

main.c

@@ -227,10 +227,15 @@ void on_keypress(XEvent *ev) {
 			changed = img_rotate_right(&img, &win);
 			break;
 
-		/* Control window */
+		/* control window */
 		case 'f':
 			win_toggle_fullscreen(&win);
 			break;
+
+		/* miscellaneous */
+		case 'a':
+			changed = img_toggle_antialias(&img);
+			break;
 	}
 
 	if (changed) {

sxiv.1

@@ -76,6 +76,10 @@ Rotate image clockwise by 90 degrees.
 .TP
 .B f
 Toggle fullscreen mode.
+.SS Miscellaneous
+.TP
+.B a
+Toggle anti-aliasing.
 .SH AUTHORS
 .TP
 Bert Muennich <ber.t at gmx.com>