Allow for changing control overlay image

src/config.cpp

@@ -480,7 +480,9 @@ parseOverlayButtonDesc(const ptree &pt, TouchOverlay::Button &out)
 static void
 parseOverlayDesc(const ptree &pt, TouchOverlay &out)
 {
-	out.image = pt.get<std::string>("image");
+	for (auto &img : pt.get_child("images")) {
+		out.images[img.second.get<int>("id")] = img.second.get<std::string>("file");
+	}
 
 	const ptree &buttons = pt.get_child("buttons");
 	for (ptree::const_iterator ci = buttons.begin(); ci != buttons.end(); ++ci)

src/config.h

@@ -24,11 +24,12 @@
 
 #include <string>
 #include <vector>
+#include <map>
 #include <set>
 
 struct TouchOverlay
 {
-	std::string image;
+	std::map<int, std::string> images;
 
 	struct Button
 	{

src/graphics.cpp

@@ -503,12 +503,16 @@ struct GraphicsPrivate
 		TEXFBO::allocEmpty(frozenScene, scRes.x, scRes.y);
 		TEXFBO::linkFBO(frozenScene);
 
+		setOverlay(0);
+
 		FloatRect screenRect(0, 0, scRes.x, scRes.y);
 		screenQuad.setTexPosRect(screenRect, screenRect);
 
 		fpsLimiter.resetFrameAdjust();
+	}
 
-		const std::string &olImage = rtData->config.touchOverlay.image;
+	void setOverlay(int id) {
+		const std::string &olImage = threadData->config.touchOverlay.images[id];
 		if (!olImage.empty())
 		{
 			SDL_RWops *ops = SDL_RWFromFile(olImage.c_str(), "rb");
@@ -862,6 +866,11 @@ void Graphics::frameReset()
 	p->fpsLimiter.resetFrameAdjust();
 }
 
+void Graphics::setOverlay(int id)
+{
+	p->setOverlay(id);
+}
+
 static void guardDisposed() {}
 
 DEF_ATTR_RD_SIMPLE(Graphics, FrameRate, int, p->frameRate)

src/graphics.h

@@ -40,6 +40,7 @@ public:
 	                const char *filename = "",
 	                int vague = 40);
 	void frameReset();
+	void setOverlay(int);
 
 	DECL_ATTR( FrameRate,  int )
 	DECL_ATTR( FrameCount, int )