From c885e753d2d081354907625f37e1f9047f340b8e Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Mon, 15 Jun 2015 17:48:19 +1000
Subject: [PATCH] image: add stride and size queries

---
 image.hpp |  2 ++
 image.ipp | 20 +++++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/image.hpp b/image.hpp
index 63961e02..8d23c812 100644
--- a/image.hpp
+++ b/image.hpp
@@ -51,6 +51,8 @@ namespace util { namespace image {
 
         //---------------------------------------------------------------------
         constexpr extent2u extent (void) const;
+        constexpr extent2u stride (void) const;
+        constexpr size_t   size   (void) const; // elements allocated
 
         constexpr bool is_packed (void) const;
 
diff --git a/image.ipp b/image.ipp
index 4709a1ce..c1018d6b 100644
--- a/image.ipp
+++ b/image.ipp
@@ -29,11 +29,29 @@ namespace util { namespace image {
     }
 
 
+    //-------------------------------------------------------------------------
+    template <typename T>
+    constexpr extent2u
+    buffer<T>::stride (void) const
+    {
+        return { 1, s };
+    }
+
+
+    //-------------------------------------------------------------------------
+    template <typename T>
+    constexpr size_t
+    buffer<T>::size (void) const
+    {
+        return extent ()[1] * stride ()[1];
+    }
+
+
     //-------------------------------------------------------------------------
     template <typename T>
     constexpr bool
     buffer<T>::is_packed (void) const
     {
-        return s == w;
+        return stride ()[1] == extent ()[0];
     }
 } }