Add simple splash screen implementation

src/CMakeLists.txt

@@ -203,6 +203,8 @@ set(SOURCES
 
     anbox/utils/environment_file.cpp
 
+    anbox/ui/splash_screen.cpp
+
     anbox/do_not_copy_or_move.h
     anbox/optional.h
     anbox/defer_action.h)

src/anbox/ui/splash_screen.cpp

@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2017 Simon Fels <morphis@gravedo.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "anbox/ui/splash_screen.h"
+#include "anbox/utils.h"
+
+#include <SDL2/SDL_image.h>
+
+namespace anbox {
+namespace ui {
+SplashScreen::SplashScreen() {
+  if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS) < 0) {
+    const auto message = utils::string_format("Failed to initialize SDL: %s", SDL_GetError());
+    BOOST_THROW_EXCEPTION(std::runtime_error(message));
+  }
+
+  const auto width = 1024, height = 768;
+  window_ = SDL_CreateWindow("", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+                             width, height, SDL_WINDOW_OPENGL | SDL_WINDOW_BORDERLESS);
+  if (!window_) {
+    const auto message = utils::string_format("Failed to create window: %s", SDL_GetError());
+    BOOST_THROW_EXCEPTION(std::runtime_error(message));
+  }
+
+  auto surface = SDL_GetWindowSurface(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");
+
+  const auto tex_width = 128, tex_height = 128;
+  SDL_Rect r{(width - tex_width) / 2, (height - tex_height) / 2, 128, 128};
+
+  SDL_SetRenderDrawColor(renderer, 0xee, 0xee, 0xee, 0xff);
+  SDL_RenderClear(renderer);
+  SDL_RenderCopy(renderer, img, nullptr, &r);
+  SDL_RenderPresent(renderer);
+
+  SDL_ShowWindow(window_);
+
+  event_thread_ = std::thread(&SplashScreen::process_events, this);
+}
+
+SplashScreen::~SplashScreen() {
+  if (event_thread_running_) {
+    event_thread_running_ = false;
+    if (event_thread_.joinable())
+      event_thread_.join();
+  }
+
+  if (window_)
+    SDL_DestroyWindow(window_);
+}
+
+void SplashScreen::process_events() {
+  event_thread_running_ = true;
+  while (event_thread_running_) {
+    SDL_Event event;
+    while (SDL_WaitEventTimeout(&event, 100)) {
+      switch (event.type) {
+      case SDL_QUIT:
+        break;
+      default:
+        break;
+      }
+    }
+  }
+}
+} // namespace ui
+} // namespace anbox

src/anbox/ui/splash_screen.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2017 Simon Fels <morphis@gravedo.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ANBOX_UI_SPLASH_SCREEN_H_
+#define ANBOX_UI_SPLASH_SCREEN_H_
+
+#include <thread>
+
+#include <SDL2/SDL.h>
+
+namespace anbox {
+namespace ui {
+class SplashScreen {
+ public:
+  SplashScreen();
+  ~SplashScreen();
+
+ private:
+  void process_events();
+
+  std::thread event_thread_;
+  bool event_thread_running_;
+  SDL_Window *window_;
+};
+} // namespace ui
+} // namespace anbox
+
+#endif