New commands: fit to the window's height/width

README.md

@@ -115,6 +115,8 @@ The following additional key commands are available in *image mode*:
     -            Zoom out
     =            Set zoom level to 100%, or [count]%
     w            Fit image into window
+    e            Fit image to window's width
+    E            Fit image to window's height
 
     h,j,k,l      Pan image 1/5 of window width/height or [count] pixels
                  left/down/up/right (also with arrow keys)

commands.c

@@ -310,9 +310,10 @@ bool i_set_zoom(arg_t a) {
 
 bool i_fit_to_win(arg_t a) {
 	bool ret = false;
+	scalemode_t sm = (scalemode_t) a;
 
 	if (mode == MODE_IMAGE) {
-		if ((ret = img_fit_win(&img)))
+		if ((ret = img_fit_win(&img, sm)))
 			img_center(&img);
 	}
 	return ret;

config.def.h

@@ -108,7 +108,9 @@ static const keymap_t keys[] = {
 	{ false,  XK_minus,         i_zoom,               (arg_t) -1 },
 	{ false,  XK_KP_Subtract,   i_zoom,               (arg_t) -1 },
 	{ false,  XK_equal,         i_set_zoom,           (arg_t) 100 },
-	{ false,  XK_w,             i_fit_to_win,         (arg_t) None },
+	{ false,  XK_w,             i_fit_to_win,         (arg_t) SCALE_FIT },
+	{ false,  XK_e,             i_fit_to_win,         (arg_t) SCALE_WIDTH },
+	{ false,  XK_E,             i_fit_to_win,         (arg_t) SCALE_HEIGHT },
 	{ false,  XK_W,             i_fit_to_img,         (arg_t) None },
 
 	{ false,  XK_less,          i_rotate,             (arg_t) DIR_LEFT },

image.c

@@ -365,7 +365,18 @@ bool img_fit(img_t *img) {
 	zw = (float) img->win->w / (float) img->w;
 	zh = (float) img->win->h / (float) img->h;
 
-	z = MIN(zw, zh);
+	switch (img->scalemode) {
+		case SCALE_WIDTH:
+			z = zw;
+			break;
+		case SCALE_HEIGHT:
+			z = zh;
+			break;
+		default:
+			z = MIN(zw, zh);
+			break;
+	}
+
 	z = MAX(z, zoom_min);
 	z = MIN(z, zmax);
 
@@ -448,11 +459,11 @@ void img_render(img_t *img) {
 	img->dirty = false;
 }
 
-bool img_fit_win(img_t *img) {
+bool img_fit_win(img_t *img, scalemode_t sm) {
 	if (img == NULL || img->im == NULL)
 		return false;
 
-	img->scalemode = SCALE_FIT;
+	img->scalemode = sm;
 	return img_fit(img);
 }
 

image.h

@@ -65,7 +65,7 @@ void img_close(img_t*, bool);
 
 void img_render(img_t*);
 
-bool img_fit_win(img_t*);
+bool img_fit_win(img_t*, scalemode_t);
 bool img_center(img_t*);
 
 bool img_zoom(img_t*, float);

sxiv.1

@@ -197,6 +197,12 @@ Set zoom level to 100%, or
 .TP
 .B w
 Set zoom level to fit image into window.
+.TP
+.B e
+Set zoom level to fit image into the window's width.
+.TP
+.B E
+Set zoom level to fit image into the window's height.
 .SS Panning
 .TP
 .BR h ", " Left

types.h

@@ -31,6 +31,8 @@ typedef enum {
 typedef enum {
 	SCALE_DOWN,
 	SCALE_FIT,
+	SCALE_WIDTH,
+	SCALE_HEIGHT,
 	SCALE_ZOOM
 } scalemode_t;