Implement fill scale mode

config.def.h

@@ -127,6 +127,7 @@ static const keymap_t keys[] = {
 	{ 0,            XK_equal,         i_set_zoom,           100 },
 	{ 0,            XK_w,             i_fit_to_win,         SCALE_DOWN },
 	{ 0,            XK_W,             i_fit_to_win,         SCALE_FIT },
+	{ 0,            XK_F,             i_fit_to_win,         SCALE_FILL },
 	{ 0,            XK_e,             i_fit_to_win,         SCALE_WIDTH },
 	{ 0,            XK_E,             i_fit_to_win,         SCALE_HEIGHT },
 	{ 0,            XK_less,          i_rotate,             DEGREE_270 },

image.c

@@ -402,6 +402,9 @@ bool img_fit(img_t *img)
 	zh = (float) img->win->h / (float) img->h;
 
 	switch (img->scalemode) {
+		case SCALE_FILL:
+			z = MAX(zw, zh);
+			break;
 		case SCALE_WIDTH:
 			z = zw;
 			break;

options.c

@@ -44,7 +44,7 @@ void parse_options(int argc, char **argv)
 {
 	int n, opt;
 	char *end, *s;
-	const char *scalemodes = "dfwh";
+	const char *scalemodes = "dfFwh";
 
 	progname = strrchr(argv[0], '/');
 	progname = progname ? progname + 1 : argv[0];

sxiv.1

@@ -97,7 +97,7 @@ may be a floating point number.
 .TP
 .BI "\-s " MODE
 Set scale mode according to MODE character. Supported modes are: [d]own, 
-[f]it, [w]idth, [h]eight.
+[f]it, [F]ill, [w]idth, [h]eight.
 .TP
 .B \-t
 Start in thumbnail mode.
@@ -311,6 +311,9 @@ Set zoom level to 100%, but fit large images into window.
 .B W
 Fit image to window.
 .TP
+.B F
+Fill image to window.
+.TP
 .B e
 Fit image to window width.
 .TP

sxiv.h

@@ -88,6 +88,7 @@ typedef enum {
 typedef enum {
 	SCALE_DOWN,
 	SCALE_FIT,
+	SCALE_FILL,
 	SCALE_WIDTH,
 	SCALE_HEIGHT,
 	SCALE_ZOOM