windowscodecs: Implement IWICBitmapFrameDecode::GetColorContexts for TIFF images.

dlls/windowscodecs/tiffformat.c

@@ -1105,8 +1105,34 @@ static HRESULT WINAPI TiffFrameDecode_GetMetadataQueryReader(IWICBitmapFrameDeco
 static HRESULT WINAPI TiffFrameDecode_GetColorContexts(IWICBitmapFrameDecode *iface,
     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 {
-    FIXME("(%p,%u,%p,%p): stub\n", iface, cCount, ppIColorContexts, pcActualCount);
-    return WINCODEC_ERR_UNSUPPORTEDOPERATION;
+    TiffFrameDecode *This = impl_from_IWICBitmapFrameDecode(iface);
+    const BYTE *profile;
+    UINT len;
+    HRESULT hr;
+
+    TRACE("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
+
+    EnterCriticalSection(&This->parent->lock);
+
+    if (pTIFFGetField(This->parent->tiff, TIFFTAG_ICCPROFILE, &len, &profile))
+    {
+        if (cCount && ppIColorContexts)
+        {
+            hr = IWICColorContext_InitializeFromMemory(*ppIColorContexts, profile, len);
+            if (FAILED(hr))
+            {
+                LeaveCriticalSection(&This->parent->lock);
+                return hr;
+            }
+        }
+        *pcActualCount = 1;
+    }
+    else
+        *pcActualCount = 0;
+
+    LeaveCriticalSection(&This->parent->lock);
+
+    return S_OK;
 }
 
 static HRESULT WINAPI TiffFrameDecode_GetThumbnail(IWICBitmapFrameDecode *iface,