Factor out icon loading to Screen::LoadIcon()

This is so it can be called multiple times without having to duplicate
code.

desktop_version/src/Screen.cpp

@@ -62,27 +62,7 @@ void Screen::init(
 	);
 	SDL_SetWindowTitle(m_window, "VVVVVV");
 
-	unsigned char *fileIn = NULL;
+	LoadIcon();
-	size_t length = 0;
-	unsigned char *data;
-	unsigned int width, height;
-	FILESYSTEM_loadFileToMemory("VVVVVV.png", &fileIn, &length);
-	lodepng_decode24(&data, &width, &height, fileIn, length);
-	FILESYSTEM_freeMemory(&fileIn);
-	SDL_Surface *icon = SDL_CreateRGBSurfaceFrom(
-		data,
-		width,
-		height,
-		24,
-		width * 3,
-		0x000000FF,
-		0x0000FF00,
-		0x00FF0000,
-		0x00000000
-	);
-	SDL_SetWindowIcon(m_window, icon);
-	SDL_FreeSurface(icon);
-	free(data);
 
 	// FIXME: This surface should be the actual backbuffer! -flibit
 	m_screen = SDL_CreateRGBSurface(
@@ -109,6 +89,31 @@ void Screen::init(
 	ResizeScreen(windowWidth, windowHeight);
 }
 
+void Screen::LoadIcon()
+{
+	unsigned char *fileIn = NULL;
+	size_t length = 0;
+	unsigned char *data;
+	unsigned int width, height;
+	FILESYSTEM_loadFileToMemory("VVVVVV.png", &fileIn, &length);
+	lodepng_decode24(&data, &width, &height, fileIn, length);
+	FILESYSTEM_freeMemory(&fileIn);
+	SDL_Surface *icon = SDL_CreateRGBSurfaceFrom(
+		data,
+		width,
+		height,
+		24,
+		width * 3,
+		0x000000FF,
+		0x0000FF00,
+		0x00FF0000,
+		0x00000000
+	);
+	SDL_SetWindowIcon(m_window, icon);
+	SDL_FreeSurface(icon);
+	free(data);
+}
+
 void Screen::ResizeScreen(int x, int y)
 {
 	static int resX = 320;

desktop_version/src/Screen.h

@@ -16,6 +16,8 @@ public:
 		bool badSignal
 	);
 
+	void LoadIcon();
+
 	void ResizeScreen(int x, int y);
 	void ResizeToNearestMultiple();
 	void GetWindowSize(int* x, int* y);