Return a const& from Image{View,Data}::size(), instead of a value.

Allows creating a StridedArrayView slice on the sizes to feed them to
various algorithms, instead of first having to copy the sizes out to a
freshly allocated array.

doc/changelog.dox

@@ -329,6 +329,10 @@ See also:
 -   @ref MeshIndexType was enlarged to 32 bits and can now wrap
     implementation-specific values similar to @ref PixelFormat,
     @ref CompressedPixelFormat, @ref VertexFormat and @ref MeshPrimitive
+-   @ref Image::size(), @ref ImageView::size() as well as
+    @ref Trade::ImageData::size() now return a @cpp const& @ce instead of a
+    value to allow creating a @relativeref{Corrade,Containers::StridedArrayView}
+    slice onto this member.
 
 @subsubsection changelog-latest-changes-debugtools DebugTools library
 

src/Magnum/Image.h

@@ -364,7 +364,7 @@ template<UnsignedInt dimensions> class Image {
         UnsignedInt pixelSize() const { return _pixelSize; }
 
         /** @brief Image size in pixels */
-        VectorTypeFor<dimensions, Int> size() const { return _size; }
+        const VectorTypeFor<dimensions, Int>& size() const { return _size; }
 
         /**
          * @brief Image data properties
@@ -470,7 +470,7 @@ template<UnsignedInt dimensions> class Image {
         PixelFormat _format;
         UnsignedInt _formatExtra;
         UnsignedInt _pixelSize;
-        Math::Vector<Dimensions, Int> _size;
+        VectorTypeFor<dimensions, Int> _size;
         Containers::Array<char> _data;
 };
 

src/Magnum/ImageView.h

@@ -410,7 +410,7 @@ template<UnsignedInt dimensions, class T> class ImageView {
         UnsignedInt pixelSize() const { return _pixelSize; }
 
         /** @brief Image size in pixels */
-        constexpr VectorTypeFor<dimensions, Int> size() const { return _size; }
+        constexpr const VectorTypeFor<dimensions, Int>& size() const { return _size; }
 
         /**
          * @brief Image data properties
@@ -484,7 +484,7 @@ template<UnsignedInt dimensions, class T> class ImageView {
         PixelFormat _format;
         UnsignedInt _formatExtra;
         UnsignedInt _pixelSize;
-        Math::Vector<Dimensions, Int> _size;
+        VectorTypeFor<dimensions, Int> _size;
         Containers::ArrayView<Type> _data;
 };
 

src/Magnum/Trade/ImageData.h

@@ -524,7 +524,7 @@ template<UnsignedInt dimensions> class ImageData {
         UnsignedInt pixelSize() const;
 
         /** @brief Image size in pixels */
-        VectorTypeFor<dimensions, Int> size() const { return _size; }
+        const VectorTypeFor<dimensions, Int>& size() const { return _size; }
 
         /**
          * @brief Uncompressed image data properties
@@ -693,7 +693,7 @@ template<UnsignedInt dimensions> class ImageData {
         };
         UnsignedInt _formatExtra;
         UnsignedInt _pixelSize;
-        Math::Vector<Dimensions, Int> _size;
+        VectorTypeFor<dimensions, Int> _size;
         Containers::Array<char> _data;
         const void* _importerState;
 };