X-Git-Url: https://git.artsoft.org/?a=blobdiff_plain;f=src%2Flibgame%2Fmisc.c;h=0d19ff9c16eadf9844d3ada6371c35e685cb3748;hb=22f539028eb272b70d339e1f37552a2a89f37dd6;hp=ea5ed01a06a8898b9a60bd6a667fee291a9b8c1d;hpb=8e17da8cdff134bfa0e766a50f408a3c06428f54;p=rocksndiamonds.git

diff --git a/src/libgame/misc.c b/src/libgame/misc.c
index ea5ed01a..0d19ff9c 100644
--- a/src/libgame/misc.c
+++ b/src/libgame/misc.c
@@ -1900,6 +1900,48 @@ int get_auto_parameter_value(char *token, char *value_raw)
   return get_parameter_value(value_raw, suffix, TYPE_INTEGER);
 }
 
+struct ScreenModeInfo *get_screen_mode_from_string(char *screen_mode_string)
+{
+  static struct ScreenModeInfo screen_mode;
+  char *screen_mode_string_x = strchr(screen_mode_string, 'x');
+  char *screen_mode_string_copy;
+  char *screen_mode_string_pos_w;
+  char *screen_mode_string_pos_h;
+
+  if (screen_mode_string_x == NULL)	/* invalid screen mode format */
+    return NULL;
+
+  screen_mode_string_copy = getStringCopy(screen_mode_string);
+
+  screen_mode_string_pos_w = screen_mode_string_copy;
+  screen_mode_string_pos_h = strchr(screen_mode_string_copy, 'x');
+  *screen_mode_string_pos_h++ = '\0';
+
+  screen_mode.width  = atoi(screen_mode_string_pos_w);
+  screen_mode.height = atoi(screen_mode_string_pos_h);
+
+  return &screen_mode;
+}
+
+void get_aspect_ratio_from_screen_mode(struct ScreenModeInfo *screen_mode,
+				       int *x, int *y)
+{
+  float aspect_ratio = (float)screen_mode->width / (float)screen_mode->height;
+  float aspect_ratio_new;
+  int i = 1;
+
+  do
+  {
+    *x = i * aspect_ratio;
+    *y = i;
+
+    aspect_ratio_new = (float)*x / (float)*y;
+
+    i++;
+  }
+  while (aspect_ratio_new != aspect_ratio && *x < screen_mode->width);
+}
+
 static void FreeCustomArtworkList(struct ArtworkListInfo *,
 				  struct ListNodeInfo ***, int *);