From 38e1ce63fd7e18943174b8f3d4604637b9866458 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Fri, 21 Aug 2020 11:34:29 +1000
Subject: [PATCH] extent: add rotate90

---
 extent.cpp | 19 +++++++++++++++++++
 extent.hpp | 53 ++++++++++++++++++++++++++++-------------------------
 2 files changed, 47 insertions(+), 25 deletions(-)

diff --git a/extent.cpp b/extent.cpp
index 8196ab8c..1945d354 100644
--- a/extent.cpp
+++ b/extent.cpp
@@ -76,6 +76,25 @@ extent<S,T>::empty (void) const
 }
 
 
+///////////////////////////////////////////////////////////////////////////////
+template <typename T>
+cruft::extent2<T>
+cruft::rotate90 (cruft::extent2<T> obj, int steps)
+{
+    if (steps % 2) {
+        return { obj.h, obj.w };
+    } else {
+        return obj;
+    }
+}
+
+
+//-----------------------------------------------------------------------------
+template cruft::extent2<i32> cruft::rotate90 (cruft::extent2<i32>, int);
+template cruft::extent2<i64> cruft::rotate90 (cruft::extent2<i64>, int);
+template cruft::extent2<f32> cruft::rotate90 (cruft::extent2<f32>, int);
+
+
 ///////////////////////////////////////////////////////////////////////////////
 namespace cruft::debug  {
     template <size_t S, typename T>
diff --git a/extent.hpp b/extent.hpp
index d3587b03..707f1a2c 100644
--- a/extent.hpp
+++ b/extent.hpp
@@ -3,11 +3,10 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  *
- * Copyright 2010-2017 Danny Robson <danny@nerdcruft.net>
+ * Copyright 2010-2020, Danny Robson <danny@nerdcruft.net>
  */
 
-#ifndef CRUFT_UTIL_EXTENT_HPP
-#define CRUFT_UTIL_EXTENT_HPP
+#pragma once
 
 #include "coord/fwd.hpp"
 #include "coord/base.hpp"
@@ -158,6 +157,28 @@ namespace cruft {
     };
 
 
+    ///////////////////////////////////////////////////////////////////////////
+    // convenience typedefs
+    template <typename T> using extent2 = extent<2,T>;
+    template <typename T> using extent3 = extent<3,T>;
+
+    template <size_t S> using extentu = extent<S,unsigned>;
+    template <size_t S> using extenti = extent<S,int>;
+    template <size_t S> using extentf = extent<S,float>;
+    template <size_t S> using extentd = extent<S,double>;
+
+
+    typedef extent2<int> extent2i;
+    typedef extent2<unsigned> extent2u;
+    typedef extent2<float> extent2f;
+    typedef extent2<double> extent2d;
+
+
+    typedef extent3<unsigned> extent3u;
+    typedef extent3<float> extent3f;
+
+
+    ///////////////////////////////////////////////////////////////////////////
     template <size_t S, typename T>
     cruft::point<S,T>
     sample (cruft::extent<S,T> shape)
@@ -181,26 +202,8 @@ namespace cruft {
     }
 
 
-    ///////////////////////////////////////////////////////////////////////////
-    // convenience typedefs
-    template <typename T> using extent2 = extent<2,T>;
-    template <typename T> using extent3 = extent<3,T>;
-
-    template <size_t S> using extentu = extent<S,unsigned>;
-    template <size_t S> using extenti = extent<S,int>;
-    template <size_t S> using extentf = extent<S,float>;
-    template <size_t S> using extentd = extent<S,double>;
-
-
-    typedef extent2<int> extent2i;
-    typedef extent2<unsigned> extent2u;
-    typedef extent2<float> extent2f;
-    typedef extent2<double> extent2d;
-
-
-    typedef extent3<unsigned> extent3u;
-    typedef extent3<float> extent3f;
+    //-------------------------------------------------------------------------
+    template <typename T>
+    extent2<T>
+    rotate90 (extent2<T> val, int steps);
 }
-
-
-#endif