Bitmap: Add option to always use render pipeline to blit text

A hack that might solve issues some users are having on
AMD SI cards with fglrx.

src/bitmap.cpp

@@ -832,6 +832,11 @@ void Bitmap::drawText(const IntRect &rect, const char *str, int align)
 
 	bool fastBlit = !p->touchesTaintedArea(posRect) && txtAlpha == 1.0;
 
+	// Hack for broken fglrx on SI cards: always use
+	// render pipeline to blit text
+	if (shState->config().forceBitmapBlit)
+		fastBlit = false;
+
 	if (fastBlit)
 	{
 		if (squeeze == 1.0)

src/config.cpp

@@ -46,6 +46,7 @@ Config::Config()
       fixedFramerate(0),
       frameSkip(true),
       solidFonts(false),
+      forceBitmapBlit(false),
       gameFolder("."),
       anyAltToggleFS(false),
       allowSymlinks(false),
@@ -67,6 +68,7 @@ void Config::read(int argc, char *argv[])
 	PO_DESC(fixedFramerate, int) \
 	PO_DESC(frameSkip, bool) \
 	PO_DESC(solidFonts, bool) \
+	PO_DESC(forceBitmapBlit, bool) \
 	PO_DESC(gameFolder, std::string) \
 	PO_DESC(anyAltToggleFS, bool) \
 	PO_DESC(allowSymlinks, bool) \

src/config.h

@@ -43,6 +43,7 @@ struct Config
 	bool frameSkip;
 
 	bool solidFonts;
+	bool forceBitmapBlit;
 
 	std::string gameFolder;
 	bool anyAltToggleFS;