[2/3] windowscodecs: Implement GetPreview in the PNG decoder.

[Dmitry Timoshkov]

---
 dlls/windowscodecs/pngformat.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/dlls/windowscodecs/pngformat.c b/dlls/windowscodecs/pngformat.c
index 051c60c..fb45804 100644
--- a/dlls/windowscodecs/pngformat.c
+++ b/dlls/windowscodecs/pngformat.c
@@ -630,8 +630,12 @@ static HRESULT WINAPI PngDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface
 static HRESULT WINAPI PngDecoder_GetPreview(IWICBitmapDecoder *iface,
     IWICBitmapSource **ppIBitmapSource)
 {
-    FIXME("(%p,%p): stub\n", iface, ppIBitmapSource);
-    return E_NOTIMPL;
+    TRACE("(%p,%p)\n", iface, ppIBitmapSource);
+
+    if (!ppIBitmapSource) return E_INVALIDARG;
+
+    *ppIBitmapSource = NULL;
+    return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 }
 
 static HRESULT WINAPI PngDecoder_GetColorContexts(IWICBitmapDecoder *iface,
-- 
1.8.0.1