From b43f2fcca82467f42760a33751529ede49338bd7 Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik.hautakoski@gmail.com>
Date: Thu, 5 Nov 2020 17:01:25 +0100
Subject: [PATCH] Display/DisplayMode: adding empty()

---
 include/Spectre/Display/DisplayMode.h | 9 +++++++++
 source/Display/DisplayMode.cpp        | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/include/Spectre/Display/DisplayMode.h b/include/Spectre/Display/DisplayMode.h
index 70f62a0..81f0eaf 100644
--- a/include/Spectre/Display/DisplayMode.h
+++ b/include/Spectre/Display/DisplayMode.h
@@ -16,6 +16,15 @@ public :
 
 	static DisplayMode getDesktopMode();
 
+	// Returns true if width hight and bpp are not set (eg. zero)
+	// useful to determine if a DisplayMode object is set or not.
+	// this is equal to:
+	//   DisplayMode a;
+	//   if (a == DisplayMode()) {
+	//		// empty
+	//   }
+	bool empty() const;
+
 	inline bool operator==(const DisplayMode& other)
 	{
 		return width == other.width
diff --git a/source/Display/DisplayMode.cpp b/source/Display/DisplayMode.cpp
index 61fe62d..13128c8 100644
--- a/source/Display/DisplayMode.cpp
+++ b/source/Display/DisplayMode.cpp
@@ -55,4 +55,9 @@ DisplayMode DisplayMode::getDesktopMode()
 	return PlatformMisc::GetDesktopMode();
 }
 
+bool DisplayMode::empty() const
+{
+	return (width + height + bpp) == 0;
+}
+
 } // namespace sp