Don't construct non-functional Font objects

Replaced Font constructor with factory method, so that if the TTF
cannot be loaded, the Font object is not constructed. The normal C++
way of handling this is with exceptions, but we're compiling with
-fno-exceptions.

src/font.cpp

@@ -14,19 +14,25 @@
 
 using namespace std;
 
-Font::Font(const string &path)
+Font *Font::defaultFont()
 {
 	if (!TTF_WasInit() && TTF_Init() < 0) {
 		ERROR("Unable to init SDL_ttf library\n");
-		return;
+		return nullptr;
 	}
 
-	font = TTF_OpenFont(TTF_FONT, TTF_FONT_SIZE);
+	TTF_Font *font = TTF_OpenFont(TTF_FONT, TTF_FONT_SIZE);
 	if (!font) {
 		ERROR("Unable to open font\n");
-		return;
+		return nullptr;
 	}
 
+	return new Font(font);
+}
+
+Font::Font(TTF_Font *font)
+	: font(font)
+{
 	fontheight = TTF_FontHeight(font);
 }
 

src/font.h

@@ -14,7 +14,11 @@ public:
 	enum HAlign { HAlignLeft, HAlignRight,  HAlignCenter };
 	enum VAlign { VAlignTop,  VAlignBottom, VAlignMiddle };
 
-	Font(const std::string &font);
+	/**
+	 * Returns a newly created Font object for the default font,
+	 * or nullptr if there was a problem creating it.
+	 */
+	static Font *defaultFont();
 	~Font();
 
 	int getTextWidth(const char *text);
@@ -34,6 +38,8 @@ public:
 				HAlign halign = HAlignLeft, VAlign valign = VAlignTop);
 
 private:
+	Font(TTF_Font *font);
+
 	void writeLine(Surface *surface, const char *text,
 				int x, int y, HAlign halign, VAlign valign);
 

src/gmenu2x.cpp

@@ -356,18 +356,13 @@ void GMenu2X::initBG() {
 }
 
 void GMenu2X::initFont() {
-	if (font != NULL) {
-		delete font;
-		font = NULL;
-	}
-
-	string fontFile = sc.getSkinFilePath("imgs/font.png");
-	if (fontFile.empty()) {
-		ERROR("Font png not found!\n");
+	delete font;
+	font = Font::defaultFont();
+	if (!font) {
+		ERROR("Cannot function without font; aborting...\n");
 		quit();
 		exit(-1);
 	}
-	font = new Font(fontFile);
 }
 
 void GMenu2X::initMenu() {