windowscodecs: Use an iface instead of a vtbl pointer in FlipRotator.

dlls/windowscodecs/fliprotate.c

@@ -34,7 +34,7 @@
 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
 
 typedef struct FlipRotator {
-    const IWICBitmapFlipRotatorVtbl *lpVtbl;
+    IWICBitmapFlipRotator IWICBitmapFlipRotator_iface;
     LONG ref;
     IWICBitmapSource *source;
     int flip_x;
@@ -43,10 +43,15 @@ typedef struct FlipRotator {
     CRITICAL_SECTION lock; /* must be held when initialized */
 } FlipRotator;
 
+static inline FlipRotator *impl_from_IWICBitmapFlipRotator(IWICBitmapFlipRotator *iface)
+{
+    return CONTAINING_RECORD(iface, FlipRotator, IWICBitmapFlipRotator_iface);
+}
+
 static HRESULT WINAPI FlipRotator_QueryInterface(IWICBitmapFlipRotator *iface, REFIID iid,
     void **ppv)
 {
-    FlipRotator *This = (FlipRotator*)iface;
+    FlipRotator *This = impl_from_IWICBitmapFlipRotator(iface);
     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
 
     if (!ppv) return E_INVALIDARG;
@@ -69,7 +74,7 @@ static HRESULT WINAPI FlipRotator_QueryInterface(IWICBitmapFlipRotator *iface, R
 
 static ULONG WINAPI FlipRotator_AddRef(IWICBitmapFlipRotator *iface)
 {
-    FlipRotator *This = (FlipRotator*)iface;
+    FlipRotator *This = impl_from_IWICBitmapFlipRotator(iface);
     ULONG ref = InterlockedIncrement(&This->ref);
 
     TRACE("(%p) refcount=%u\n", iface, ref);
@@ -79,7 +84,7 @@ static ULONG WINAPI FlipRotator_AddRef(IWICBitmapFlipRotator *iface)
 
 static ULONG WINAPI FlipRotator_Release(IWICBitmapFlipRotator *iface)
 {
-    FlipRotator *This = (FlipRotator*)iface;
+    FlipRotator *This = impl_from_IWICBitmapFlipRotator(iface);
     ULONG ref = InterlockedDecrement(&This->ref);
 
     TRACE("(%p) refcount=%u\n", iface, ref);
@@ -98,7 +103,7 @@ static ULONG WINAPI FlipRotator_Release(IWICBitmapFlipRotator *iface)
 static HRESULT WINAPI FlipRotator_GetSize(IWICBitmapFlipRotator *iface,
     UINT *puiWidth, UINT *puiHeight)
 {
-    FlipRotator *This = (FlipRotator*)iface;
+    FlipRotator *This = impl_from_IWICBitmapFlipRotator(iface);
     TRACE("(%p,%p,%p)\n", iface, puiWidth, puiHeight);
 
     if (!This->source)
@@ -135,7 +140,7 @@ static HRESULT WINAPI FlipRotator_CopyPalette(IWICBitmapFlipRotator *iface,
 static HRESULT WINAPI FlipRotator_CopyPixels(IWICBitmapFlipRotator *iface,
     const WICRect *prc, UINT cbStride, UINT cbBufferSize, BYTE *pbBuffer)
 {
-    FlipRotator *This = (FlipRotator*)iface;
+    FlipRotator *This = impl_from_IWICBitmapFlipRotator(iface);
     HRESULT hr;
     UINT y;
     UINT srcy, srcwidth, srcheight;
@@ -194,7 +199,7 @@ static HRESULT WINAPI FlipRotator_CopyPixels(IWICBitmapFlipRotator *iface,
 static HRESULT WINAPI FlipRotator_Initialize(IWICBitmapFlipRotator *iface,
     IWICBitmapSource *pISource, WICBitmapTransformOptions options)
 {
-    FlipRotator *This = (FlipRotator*)iface;
+    FlipRotator *This = impl_from_IWICBitmapFlipRotator(iface);
     HRESULT hr=S_OK;
 
     TRACE("(%p,%p,%u)\n", iface, pISource, options);
@@ -253,7 +258,7 @@ HRESULT FlipRotator_Create(IWICBitmapFlipRotator **fliprotator)
     This = HeapAlloc(GetProcessHeap(), 0, sizeof(FlipRotator));
     if (!This) return E_OUTOFMEMORY;
 
-    This->lpVtbl = &FlipRotator_Vtbl;
+    This->IWICBitmapFlipRotator_iface.lpVtbl = &FlipRotator_Vtbl;
     This->ref = 1;
     This->source = NULL;
     This->flip_x = 0;
@@ -262,7 +267,7 @@ HRESULT FlipRotator_Create(IWICBitmapFlipRotator **fliprotator)
     InitializeCriticalSection(&This->lock);
     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": FlipRotator.lock");
 
-    *fliprotator = (IWICBitmapFlipRotator*)This;
+    *fliprotator = &This->IWICBitmapFlipRotator_iface;
 
     return S_OK;
 }