DirectXTex: added move operators for ScratchImage, Blob

DirectXTex/DirectXTex.h

@@ -244,9 +244,14 @@ namespace DirectX
     class ScratchImage
     {
     public:
-        ScratchImage() : _nimages(0), _size(0), _image(0), _memory(0) {}
+        ScratchImage()
+            : _nimages(0), _size(0), _image(nullptr), _memory(nullptr) {}
+        ScratchImage(ScratchImage&& moveFrom)
+            : _nimages(0), _size(0), _image(nullptr), _memory(nullptr) { *this = std::move(moveFrom); }
         ~ScratchImage() { Release(); }
 
+        ScratchImage& operator= (ScratchImage&& moveFrom);
+
         HRESULT Initialize( _In_ const TexMetadata& mdata );
 
         HRESULT Initialize1D( _In_ DXGI_FORMAT fmt, _In_ size_t length, _In_ size_t arraySize, _In_ size_t mipLevels );
@@ -291,9 +296,12 @@ namespace DirectX
     class Blob
     {
     public:
-        Blob() : _buffer(0), _size(0) {}
+        Blob() : _buffer(nullptr), _size(0) {}
+        Blob(Blob&& moveFrom) : _buffer(nullptr), _size(0) { *this = std::move(moveFrom); }
         ~Blob() { Release(); }
 
+        Blob& operator= (Blob&& moveFrom);
+
         HRESULT Initialize( _In_ size_t size );
 
         void Release();

DirectXTex/DirectXTexImage.cpp

@@ -229,6 +229,27 @@ bool _SetupImageArray( uint8_t *pMemory, size_t pixelSize,
 // ScratchImage - Bitmap image container
 //=====================================================================================
 
+ScratchImage& ScratchImage::operator= (ScratchImage&& moveFrom)
+{
+    if ( this != &moveFrom )
+    {
+        Release();
+
+        _nimages = moveFrom._nimages;
+        _size = moveFrom._size;
+        _metadata = moveFrom._metadata;
+        _image = moveFrom._image;
+        _memory = moveFrom._memory;
+
+        moveFrom._nimages = 0;
+        moveFrom._size = 0;
+        moveFrom._image = nullptr;
+        moveFrom._memory = nullptr;
+    }
+    return *this;
+}
+
+
 //-------------------------------------------------------------------------------------
 // Methods
 //-------------------------------------------------------------------------------------

DirectXTex/DirectXTexUtil.cpp

@@ -915,6 +915,21 @@ size_t TexMetadata::ComputeIndex( size_t mip, size_t item, size_t slice ) const
 // Blob - Bitmap image container
 //=====================================================================================
 
+Blob& Blob::operator= (Blob&& moveFrom)
+{
+    if ( this != &moveFrom )
+    {
+        Release();
+
+        _buffer = moveFrom._buffer;
+        _size = moveFrom._size;
+
+        moveFrom._buffer = nullptr;
+        moveFrom._size = 0;
+    }
+    return *this;
+}
+
 void Blob::Release()
 {
     if ( _buffer )