(svn r25343) -Add: method to count the number of lines required to draw a string with line warping

src/gfx.cpp

@@ -882,6 +882,23 @@ int GetStringHeight(StringID str, int maxw)
 	return GetMultilineStringHeight(buffer, GB(tmp, 0, 16), FS_NORMAL);
 }
 
+/**
+ * Calculates number of lines of string. The string is changed to a multiline string if needed.
+ * @param str string to check
+ * @param maxw maximum string width
+ * @return number of lines of string when it is drawn
+ */
+int GetStringLineCount(StringID str, int maxw)
+{
+	char buffer[DRAW_STRING_BUFFER];
+
+	GetString(buffer, str, lastof(buffer));
+
+	uint32 tmp = FormatStringLinebreaks(buffer, lastof(buffer), maxw);
+
+	return 1 + GB(tmp, 0, 16);
+}
+
 /**
  * Calculate string bounding box for multi-line strings.
  * @param str        String to check.

src/gfx_func.h

@@ -124,6 +124,7 @@ Dimension GetStringBoundingBox(const char *str, FontSize start_fontsize = FS_NOR
 Dimension GetStringBoundingBox(StringID strid);
 uint32 FormatStringLinebreaks(char *str, const char *last, int maxw, FontSize start_fontsize = FS_NORMAL);
 int GetStringHeight(StringID str, int maxw);
+int GetStringLineCount(StringID str, int maxw);
 Dimension GetStringMultiLineBoundingBox(StringID str, const Dimension &suggestion);
 Dimension GetStringMultiLineBoundingBox(const char *str, const Dimension &suggestion);
 void LoadStringWidthTable(bool monospace = false);