Change Seat's get_char_cell_size to get_window_pixel_size.

That's more directly useful in uxpty.c (which is currently the only
actual client of the function), and also matches the data that SSH
clients send in "pty-req". Also, it makes that method behave more like
the GUI query function get_window_pixels used by terminal.c (with the
sole exception that unlike g_w_p it's allowed to return failure), so
it becomes even more trivial to implement in the GUI front ends.

misc.c

@@ -1414,5 +1414,5 @@ int nullseat_is_always_utf8(Seat *seat) { return TRUE; }
 void nullseat_echoedit_update(Seat *seat, int echoing, int editing) {}
 const char *nullseat_get_x_display(Seat *seat) { return NULL; }
 int nullseat_get_windowid(Seat *seat, long *id_out) { return FALSE; }
-int nullseat_get_char_cell_size(
+int nullseat_get_window_pixel_size(
     Seat *seat, int *width, int *height) { return FALSE; }

pscp.c

@@ -80,7 +80,7 @@ static const SeatVtable pscp_seat_vt = {
     nullseat_echoedit_update,
     nullseat_get_x_display,
     nullseat_get_windowid,
-    nullseat_get_char_cell_size,
+    nullseat_get_window_pixel_size,
 };
 static Seat pscp_seat[1] = {{ &pscp_seat_vt }};
 

psftp.c

@@ -61,7 +61,7 @@ static const SeatVtable psftp_seat_vt = {
     nullseat_echoedit_update,
     nullseat_get_x_display,
     nullseat_get_windowid,
-    nullseat_get_char_cell_size,
+    nullseat_get_window_pixel_size,
 };
 static Seat psftp_seat[1] = {{ &psftp_seat_vt }};
 

putty.h

@@ -903,12 +903,12 @@ struct SeatVtable {
     int (*get_windowid)(Seat *seat, long *id_out);
 
     /*
-     * Return the pixel size of a terminal character cell. If the
+     * Return the size of the terminal window in pixels. If the
      * concept is meaningless or the information is unavailable,
      * return FALSE; otherwise fill in the output pointers and return
      * TRUE.
      */
-    int (*get_char_cell_size)(Seat *seat, int *width, int *height);
+    int (*get_window_pixel_size)(Seat *seat, int *width, int *height);
 };
 
 #define seat_output(seat, is_stderr, data, len) \
@@ -939,8 +939,8 @@ struct SeatVtable {
     ((seat)->vt->get_x_display(seat))
 #define seat_get_windowid(seat, out) \
     ((seat)->vt->get_windowid(seat, out))
-#define seat_get_char_cell_size(seat, width, height) \
-    ((seat)->vt->get_char_cell_size(seat, width, height))
+#define seat_get_window_pixel_size(seat, width, height) \
+    ((seat)->vt->get_window_pixel_size(seat, width, height))
 
 /* Unlike the seat's actual method, the public entry point
  * seat_connection_fatal is a wrapper function with a printf-like API,
@@ -983,7 +983,7 @@ int nullseat_is_always_utf8(Seat *seat);
 void nullseat_echoedit_update(Seat *seat, int echoing, int editing);
 const char *nullseat_get_x_display(Seat *seat);
 int nullseat_get_windowid(Seat *seat, long *id_out);
-int nullseat_get_char_cell_size(Seat *seat, int *width, int *height);
+int nullseat_get_window_pixel_size(Seat *seat, int *width, int *height);
 
 /*
  * Seat functions provided by the platform's console-application

unix/gtkwin.c

@@ -340,11 +340,10 @@ static int gtk_seat_is_utf8(Seat *seat)
     return frontend_is_utf8(inst);
 }
 
-static int gtk_seat_get_char_cell_size(Seat *seat, int *w, int *h)
+static int gtk_seat_get_window_pixel_size(Seat *seat, int *w, int *h)
 {
     Frontend *inst = container_of(seat, Frontend, seat);
-    *w = inst->font_width;
-    *h = inst->font_height;
+    get_window_pixels(inst, w, h);
     return TRUE;
 }
 
@@ -376,7 +375,7 @@ static const SeatVtable gtk_seat_vt = {
 #else
     gtk_seat_get_windowid,
 #endif
-    gtk_seat_get_char_cell_size,
+    gtk_seat_get_window_pixel_size,
 };
 
 static void gtk_eventlog(LogPolicy *lp, const char *string)

unix/uxplink.c

@@ -394,7 +394,7 @@ static const SeatVtable plink_seat_vt = {
     plink_echoedit_update,
     nullseat_get_x_display,
     nullseat_get_windowid,
-    nullseat_get_char_cell_size,
+    nullseat_get_window_pixel_size,
 };
 static Seat plink_seat[1] = {{ &plink_seat_vt }};
 

unix/uxpty.c

@@ -1155,12 +1155,12 @@ static void pty_size(Backend *be, int width, int height)
     pty->term_width = width;
     pty->term_height = height;
 
-    seat_get_char_cell_size(pty->seat, &xpixel, &ypixel);
+    seat_get_window_pixel_size(pty->seat, &xpixel, &ypixel);
 
     size.ws_row = (unsigned short)pty->term_height;
     size.ws_col = (unsigned short)pty->term_width;
-    size.ws_xpixel = (unsigned short)pty->term_width * xpixel;
-    size.ws_ypixel = (unsigned short)pty->term_height * ypixel;
+    size.ws_xpixel = (unsigned short)xpixel;
+    size.ws_ypixel = (unsigned short)ypixel;
     ioctl(pty->master_fd, TIOCSWINSZ, (void *)&size);
     return;
 }

windows/window.c

@@ -245,10 +245,9 @@ char *win_seat_get_ttymode(Seat *seat, const char *mode)
     return term_get_ttymode(term, mode);
 }
 
-int win_seat_get_char_cell_size(Seat *seat, int *x, int *y)
+int win_seat_get_window_pixel_size(Seat *seat, int *x, int *y)
 {
-    *x = font_width;
-    *y = font_height;
+    get_window_pixels(NULL, x, y);
     return TRUE;
 }
 
@@ -277,7 +276,7 @@ static const SeatVtable win_seat_vt = {
     nullseat_echoedit_update,
     nullseat_get_x_display,
     nullseat_get_windowid,
-    win_seat_get_char_cell_size,
+    win_seat_get_window_pixel_size,
 };
 Seat win_seat[1] = {{ &win_seat_vt }};
 

windows/winplink.c

@@ -103,7 +103,7 @@ static const SeatVtable plink_seat_vt = {
     plink_echoedit_update,
     nullseat_get_x_display,
     nullseat_get_windowid,
-    nullseat_get_char_cell_size,
+    nullseat_get_window_pixel_size,
 };
 static Seat plink_seat[1] = {{ &plink_seat_vt }};