From a6208de4f8a50c32b71d03b4028d6e78ac19e632 Mon Sep 17 00:00:00 2001
From: Vraiment <jemc44@gmail.com>
Date: Mon, 24 Jul 2017 23:48:14 -0700
Subject: [PATCH] Added GetDisplayDPI

---
 SDL2pp/Display.cc | 11 +++++++++++
 SDL2pp/Display.hh | 48 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)

diff --git a/SDL2pp/Display.cc b/SDL2pp/Display.cc
index 40733af..cecccf2 100644
--- a/SDL2pp/Display.cc
+++ b/SDL2pp/Display.cc
@@ -26,6 +26,17 @@
 #include <SDL_video.h>
 
 namespace SDL2pp {
+#if SDL_VERSION_ATLEAST(2, 0, 4)
+DPI GetDisplayDPI(int displayIndex) {
+	float diagonal = 0, horizontal = 0, vertical = 0;
+	if (SDL_GetDisplayDPI(displayIndex, &diagonal, &horizontal, &vertical) < 0) {
+		throw Exception("SDL_GetDisplayDPI");
+	}
+	
+	return DPI{diagonal, horizontal, vertical};
+}
+#endif
+
 #if SDL_VERSION_ATLEAST(2, 0, 5)
 Rect GetDisplayUsableBounds(int displayIndex) {
 	Rect result;
diff --git a/SDL2pp/Display.hh b/SDL2pp/Display.hh
index 5a1bef5..de584b7 100644
--- a/SDL2pp/Display.hh
+++ b/SDL2pp/Display.hh
@@ -29,6 +29,54 @@
 #include <SDL2pp/Rect.hh>
 
 namespace SDL2pp {
+#if SDL_VERSION_ATLEAST(2, 0, 4)
+	////////////////////////////////////////////////////////////
+	/// \brief Read-only struct to store DPI information of a display
+	///
+	/// \ingroup graphics
+	///
+	/// \headerfile SDL2pp/Display.hh
+	///
+	////////////////////////////////////////////////////////////
+	struct SDL2PP_EXPORT DPI {
+		////////////////////////////////////////////////////////////
+		/// \brief The diagonal DPI of the display
+		///
+		////////////////////////////////////////////////////////////
+		const float Diagonal;
+		
+		////////////////////////////////////////////////////////////
+		/// \brief The horizontal DPI of the display
+		///
+		////////////////////////////////////////////////////////////
+		const float Horizontal;
+		
+		////////////////////////////////////////////////////////////
+		/// \brief The vertical DPI of the display
+		///
+		////////////////////////////////////////////////////////////
+		const float Vertical;
+	};
+	
+	////////////////////////////////////////////////////////////
+	/// \brief Gets the dots/pixels per inch of a given display
+	///
+	/// \ingroup graphics
+	///
+	/// \headerfile SDL2pp/Display.hh
+	///
+	/// \param[in] displayIndex The display to retrieve the DPI
+	///
+	/// \returns A DPI object with the dpi values for the given display
+	///
+	/// \throws SDL2pp::Exception
+	///
+	/// \see https://wiki.libsdl.org/SDL_GetDisplayDPI
+	///
+	////////////////////////////////////////////////////////////
+	SDL2PP_EXPORT DPI GetDisplayDPI(int displayIndex);
+#endif
+
 #if SDL_VERSION_ATLEAST(2, 0, 5)
 	////////////////////////////////////////////////////////////
 	/// \brief Gets the usable desktop area of a given display