From 4ba0ff8deb57aba3b034462c6c00ecf13ee281c9 Mon Sep 17 00:00:00 2001
From: Colin Snover <github.com@zetafleet.com>
Date: Thu, 11 Feb 2016 16:25:33 -0600
Subject: [PATCH] COMMON: Add convenience method to Common::Rational for 1:1
 ratios

For SCI engine games, ratios may not be normalised and so to avoid
extra scaling, there needs to be a way to simply check whether a
ratio is 1:1.
---
 common/rational.h      |  2 ++
 test/common/rational.h | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/common/rational.h b/common/rational.h
index 55fb3617748..89caaf25b4b 100644
--- a/common/rational.h
+++ b/common/rational.h
@@ -84,6 +84,8 @@ public:
 	int getNumerator() const { return _num; }
 	int getDenominator() const { return _denom; }
 
+	bool isOne() const { return _num == _denom; }
+
 	void debugPrint(int debuglevel = 0, const char *caption = "Rational:") const;
 
 private:
diff --git a/test/common/rational.h b/test/common/rational.h
index 46dfc278c72..23d0c10acd5 100644
--- a/test/common/rational.h
+++ b/test/common/rational.h
@@ -130,4 +130,15 @@ public:
 		TS_ASSERT_EQUALS(r1 / 2, Common::Rational(1, 4));
 		TS_ASSERT_EQUALS(2 / r1, Common::Rational(4, 1));
 	}
+
+	void test_isOne() {
+		Common::Rational r0(5, 5);
+		Common::Rational r1(1, 2);
+		Common::Rational r2(2, 1);
+		Common::Rational r3(1, 1);
+		TS_ASSERT(r0.isOne());
+		TS_ASSERT(!r1.isOne());
+		TS_ASSERT(!r2.isOne());
+		TS_ASSERT(r3.isOne());
+	}
 };