windowscodecs: Implement GetThumbnail in the ICO frame decoder.

[Dmitry Timoshkov]

---
 dlls/windowscodecs/icoformat.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/dlls/windowscodecs/icoformat.c b/dlls/windowscodecs/icoformat.c
index 7aec245..da5a733 100644
--- a/dlls/windowscodecs/icoformat.c
+++ b/dlls/windowscodecs/icoformat.c
@@ -200,8 +200,12 @@ static HRESULT WINAPI IcoFrameDecode_GetColorContexts(IWICBitmapFrameDecode *ifa
 static HRESULT WINAPI IcoFrameDecode_GetThumbnail(IWICBitmapFrameDecode *iface,
     IWICBitmapSource **ppIThumbnail)
 {
-    FIXME("(%p,%p)\n", iface, ppIThumbnail);
-    return E_NOTIMPL;
+    TRACE("(%p,%p)\n", iface, ppIThumbnail);
+
+    if (!ppIThumbnail) return E_INVALIDARG;
+
+    *ppIThumbnail = NULL;
+    return WINCODEC_ERR_CODECNOTHUMBNAIL;
 }
 
 static const IWICBitmapFrameDecodeVtbl IcoFrameDecode_Vtbl = {
@@ -605,6 +609,10 @@ static HRESULT WINAPI IcoDecoder_GetThumbnail(IWICBitmapDecoder *iface,
     IWICBitmapSource **ppIThumbnail)
 {
     TRACE("(%p,%p)\n", iface, ppIThumbnail);
+
+    if (!ppIThumbnail) return E_INVALIDARG;
+
+    *ppIThumbnail = NULL;
     return WINCODEC_ERR_CODECNOTHUMBNAIL;
 }
 
-- 
1.8.0.2