Use correct resource path and check for errors on splash screen creation

src/anbox/config.cpp

@@ -41,6 +41,10 @@ void anbox::SystemConfiguration::set_data_path(const std::string &path) {
   data_path = path;
 }
 
+void anbox::SystemConfiguration::set_resource_path(const std::string &path) {
+  resource_path = path;
+}
+
 fs::path anbox::SystemConfiguration::data_dir() const {
   return data_path;
 }
@@ -76,6 +80,10 @@ std::string anbox::SystemConfiguration::application_item_dir() const {
   return dir.string();
 }
 
+std::string anbox::SystemConfiguration::resource_dir() const {
+  return resource_path.string();
+}
+
 anbox::SystemConfiguration& anbox::SystemConfiguration::instance() {
   static SystemConfiguration config;
   return config;

src/anbox/config.h

@@ -31,6 +31,7 @@ class SystemConfiguration {
   virtual ~SystemConfiguration() = default;
 
   void set_data_path(const std::string &path);
+  void set_resource_path(const std::string &path);
 
   boost::filesystem::path data_dir() const;
   std::string rootfs_dir() const;
@@ -40,11 +41,13 @@ class SystemConfiguration {
   std::string container_socket_path() const;
   std::string input_device_dir() const;
   std::string application_item_dir() const;
+  std::string resource_dir() const;
 
  protected:
   SystemConfiguration() = default;
 
   boost::filesystem::path data_path = "/var/lib/anbox";
+  boost::filesystem::path resource_path = "/usr/share/anbox";
 
 };
 }  // namespace anbox

src/anbox/ui/splash_screen.cpp

@@ -16,6 +16,7 @@
  */
 
 #include "anbox/ui/splash_screen.h"
+#include "anbox/config.h"
 #include "anbox/utils.h"
 
 #include <SDL2/SDL_image.h>
@@ -37,11 +38,22 @@ SplashScreen::SplashScreen() {
   }
 
   auto surface = SDL_GetWindowSurface(window_);
+  if (!surface)
+    BOOST_THROW_EXCEPTION(std::runtime_error("Could not retrieve surface for our window"));
+
   SDL_FillRect(surface, nullptr, SDL_MapRGB(surface->format, 0xee, 0xee, 0xee));
   SDL_UpdateWindowSurface(window_);
 
   auto renderer = SDL_CreateRenderer(window_, -1, SDL_RENDERER_ACCELERATED);
-  auto img = IMG_LoadTexture(renderer, "/snap/anbox/current/snap/gui/icon.png");
+  if (!renderer)
+    BOOST_THROW_EXCEPTION(std::runtime_error("Could not create renderer"));
+
+  const auto icon_path = utils::string_format("%s/ui/icon.png", SystemConfiguration::instance().resource_dir());
+  auto img = IMG_LoadTexture(renderer, icon_path.c_str());
+  if (!img) {
+    const auto msg = utils::string_format("Failed to create texture from %s", icon_path);
+    BOOST_THROW_EXCEPTION(std::runtime_error(msg));
+  }
 
   const auto tex_width = 128, tex_height = 128;
   SDL_Rect r{(width - tex_width) / 2, (height - tex_height) / 2, 128, 128};