windowscodecs: Use WINCODEC_ERR_UNSUPPORTEDOPERATION in GetColorContexts stubs.

[Vincent Povirk]

For bug 30721.

In my testing on Windows, I found that some decoders return
WINCODEC_ERR_UNSUPPORTEDOPERATION from this method, and some succeed
but report 0 contexts. I was not able to find an image file that
produced a color context.

I'm guessing that WPF is treating this particular error code as "not
implemented" and others as "something went wrong".
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From c9165fee1cd4e08ccf4962b83e60afd677842275 Mon Sep 17 00:00:00 2001
From: Vincent Povirk <vincent at codeweavers.com>
Date: Tue, 25 Sep 2012 16:34:59 -0500
Subject: [PATCH] windowscodecs: Use WINCODEC_ERR_UNSUPPORTEDOPERATION in
 GetColorContexts stubs.

---
 dlls/windowscodecs/pngformat.c  |    4 ++--
 dlls/windowscodecs/tiffformat.c |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/dlls/windowscodecs/pngformat.c b/dlls/windowscodecs/pngformat.c
index d0977b4..686f9c6 100644
--- a/dlls/windowscodecs/pngformat.c
+++ b/dlls/windowscodecs/pngformat.c
@@ -625,7 +625,7 @@ static HRESULT WINAPI PngDecoder_GetColorContexts(IWICBitmapDecoder *iface,
     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 {
     FIXME("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
-    return E_NOTIMPL;
+    return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 }
 
 static HRESULT WINAPI PngDecoder_GetThumbnail(IWICBitmapDecoder *iface,
@@ -845,7 +845,7 @@ static HRESULT WINAPI PngDecoder_Frame_GetColorContexts(IWICBitmapFrameDecode *i
     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 {
     FIXME("(%p,%u,%p,%p): stub\n", iface, cCount, ppIColorContexts, pcActualCount);
-    return E_NOTIMPL;
+    return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 }
 
 static HRESULT WINAPI PngDecoder_Frame_GetThumbnail(IWICBitmapFrameDecode *iface,
diff --git a/dlls/windowscodecs/tiffformat.c b/dlls/windowscodecs/tiffformat.c
index 05b6aba..cf93540 100644
--- a/dlls/windowscodecs/tiffformat.c
+++ b/dlls/windowscodecs/tiffformat.c
@@ -649,7 +649,7 @@ static HRESULT WINAPI TiffDecoder_GetColorContexts(IWICBitmapDecoder *iface,
     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 {
     FIXME("(%p,%u,%p,%p)\n", iface, cCount, ppIColorContexts, pcActualCount);
-    return E_NOTIMPL;
+    return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 }
 
 static HRESULT WINAPI TiffDecoder_GetThumbnail(IWICBitmapDecoder *iface,
@@ -1099,7 +1099,7 @@ static HRESULT WINAPI TiffFrameDecode_GetColorContexts(IWICBitmapFrameDecode *if
     UINT cCount, IWICColorContext **ppIColorContexts, UINT *pcActualCount)
 {
     FIXME("(%p,%u,%p,%p): stub\n", iface, cCount, ppIColorContexts, pcActualCount);
-    return E_NOTIMPL;
+    return WINCODEC_ERR_UNSUPPORTEDOPERATION;
 }
 
 static HRESULT WINAPI TiffFrameDecode_GetThumbnail(IWICBitmapFrameDecode *iface,
-- 
1.7.9.5