Add current video settings to the game_config::full_build_report.

Backport of 11f96b3

src/build_info.cpp

@@ -22,6 +22,7 @@
 #include "formatter.hpp"
 #include "gettext.hpp"
 #include "serialization/unicode.hpp"
+#include "video.hpp"
 
 #include <algorithm>
 #include <fstream>
@@ -481,7 +482,11 @@ std::string full_build_report()
 	  << '\n'
 	  << report_heading("Features")
 	  << '\n'
-	  << game_config::optional_features_report();
+	  << game_config::optional_features_report()
+	  << '\n'
+	  << report_heading("Current video settings")
+	  << '\n'
+	  << CVideo::video_settings_report();
 
 	return o.str();
 }

src/video.cpp

@@ -132,6 +132,31 @@ CVideo::~CVideo()
 	LOG_DP << "called SDL_Quit()\n";
 }
 
+std::string CVideo::video_settings_report()
+{
+	if (singleton_ == nullptr) return "No video initialized.\n";
+	if (singleton_->non_interactive())
+		return "Initialized but non-interactive.\n";
+	sdl::window* win = singleton_->get_window();
+	if (!win) return "Interactive but no SDL window.\n";
+	std::ostringstream o;
+	o << "Current pixel resolution: "
+	  << singleton_->get_width() << "x" << singleton_->get_height()
+	  << '\n'
+	  << "Refresh rate: " << singleton_->current_refresh_rate()
+	  << '\n';
+	float hdpi, vdpi;
+	int returncode = SDL_GetDisplayDPI(win->get_display_index(),
+					   nullptr, &hdpi, &vdpi);
+	if (returncode != 0) {
+		o << "SDL not supplying dots per inch.\n";
+	} else {
+		o << "SDL reports: " << hdpi << "x" << vdpi
+		  << " dots per inch.\n";
+	}
+	return o.str();
+}
+
 bool CVideo::non_interactive() const
 {
 	return fake_interactive ? false : (window == nullptr);

src/video.hpp

@@ -45,6 +45,8 @@ class CVideo
 		return *singleton_;
 	}
 
+	static std::string video_settings_report();
+
 	/***** ***** ***** ***** Unit test-related functions ***** ***** ****** *****/
 
 	void make_fake();