(svn r14618) -Feature: when the chosen language isn't supported by the current font, try to find a font that does and use that instead. Thanks to glx/michi_cc for the Windows implementation.

src/strgen/strgen.cpp

@@ -87,6 +87,7 @@ static uint32 _hash;
 static char _lang_name[32], _lang_ownname[32], _lang_isocode[16];
 static byte _lang_pluralform;
 static byte _lang_textdir;
+static uint16 _lang_winlangid;
 #define MAX_NUM_GENDER 8
 static char _genders[MAX_NUM_GENDER][16];
 static int _numgenders;
@@ -649,6 +650,13 @@ static void HandlePragma(char *str)
 		} else {
 			error("Invalid textdir %s", str + 8);
 		}
+	} else if (!memcmp(str, "winlangid ", 10)) {
+		char *buf = str + 10;
+		long langid = strtol(buf, NULL, 16);
+		if (langid > UINT16_MAX || langid < 0) {
+			error("Invalid winlangid %s", buf);
+		}
+		_lang_winlangid = (uint16)langid;
 	} else if (!memcmp(str, "gender ", 7)) {
 		char* buf = str + 7;
 
@@ -912,6 +920,7 @@ static void ParseFile(const char *file, bool english)
 	_numgenders = 0;
 	_lang_name[0] = _lang_ownname[0] = _lang_isocode[0] = '\0';
 	_lang_textdir = TD_LTR;
+	_lang_winlangid = 0x0000; // neutral language code
 	// TODO:!! We can't reset the cases. In case the translated strings
 	// derive some strings from english....
 
@@ -1161,6 +1170,7 @@ static void WriteLangfile(const char *filename)
 	hdr.version = TO_LE32(_hash);
 	hdr.plural_form = _lang_pluralform;
 	hdr.text_dir = _lang_textdir;
+	hdr.winlangid = TO_LE16(_lang_winlangid);
 	strcpy(hdr.name, _lang_name);
 	strcpy(hdr.own_name, _lang_ownname);
 	strcpy(hdr.isocode, _lang_isocode);

src/strgen/strgen.h

@@ -14,7 +14,16 @@ struct LanguagePackHeader {
 	uint16 offsets[32]; // the offsets
 	byte plural_form;   // plural form index
 	byte text_dir;      // default direction of the text
-	byte pad[2];        // pad header to be a multiple of 4
+	/**
+	 * Windows language ID:
+	 * Windows cannot and will not convert isocodes to something it can use to
+	 * determine whether a font can be used for the language or not. As a result
+	 * of that we need to pass the language id via strgen to OpenTTD to tell
+	 * what language it is in "Windows". The ID is the 'locale identifier' on:
+	 *   http://msdn.microsoft.com/en-us/library/ms776294.aspx
+	 */
+	uint16 winlangid;   // windows language id
+	/* byte pad[0];        // pad header to be a multiple of 4 */
 };
 
 assert_compile(sizeof(LanguagePackHeader) % 4 == 0);