windowscodecs: Add a test to show that QueryCapability initializes the decoder.

dlls/windowscodecs/tests/tiffformat.c

@@ -185,6 +185,7 @@ static void test_QueryCapability(void)
     HRESULT hr;
     IStream *stream;
     IWICBitmapDecoder *decoder;
+    IWICBitmapFrameDecode *frame;
     static const DWORD exp_caps = WICBitmapDecoderCapabilityCanDecodeAllImages |
                                   WICBitmapDecoderCapabilityCanDecodeSomeImages |
                                   WICBitmapDecoderCapabilityCanEnumerateMetadata;
@@ -206,6 +207,9 @@ static void test_QueryCapability(void)
     ok(hr == S_OK || broken(hr == E_POINTER) /* XP */, "GetFrameCount error %#x\n", hr);
     ok(frame_count == 0, "expected 0, got %u\n", frame_count);
 
+    hr = IWICBitmapDecoder_GetFrame(decoder, 0, &frame);
+    ok(hr == WINCODEC_ERR_FRAMEMISSING || broken(hr == E_POINTER) /* XP */, "expected WINCODEC_ERR_FRAMEMISSING, got %#x\n", hr);
+
     pos.QuadPart = 4;
     hr = IStream_Seek(stream, pos, SEEK_SET, NULL);
     ok(hr == S_OK, "IStream_Seek error %#x\n", hr);
@@ -221,6 +225,10 @@ static void test_QueryCapability(void)
     ok(hr == S_OK, "GetFrameCount error %#x\n", hr);
     ok(frame_count == 1, "expected 1, got %u\n", frame_count);
 
+    hr = IWICBitmapDecoder_GetFrame(decoder, 0, &frame);
+    ok(hr == S_OK, "GetFrame error %#x\n", hr);
+    IWICBitmapFrameDecode_Release(frame);
+
     pos.QuadPart = 0;
     hr = IStream_Seek(stream, pos, SEEK_CUR, &cur_pos);
     ok(hr == S_OK, "IStream_Seek error %#x\n", hr);
@@ -251,6 +259,10 @@ todo_wine
     ok(hr == S_OK, "GetFrameCount error %#x\n", hr);
     ok(frame_count == 1, "expected 1, got %u\n", frame_count);
 
+    hr = IWICBitmapDecoder_GetFrame(decoder, 0, &frame);
+    ok(hr == S_OK, "GetFrame error %#x\n", hr);
+    IWICBitmapFrameDecode_Release(frame);
+
     hr = IWICBitmapDecoder_Initialize(decoder, stream, WICDecodeMetadataCacheOnDemand);
     ok(hr == WINCODEC_ERR_WRONGSTATE, "expected WINCODEC_ERR_WRONGSTATE, got %#x\n", hr);
 

dlls/windowscodecs/tiffformat.c

@@ -702,7 +702,7 @@ static HRESULT WINAPI TiffDecoder_GetFrame(IWICBitmapDecoder *iface,
     TRACE("(%p,%u,%p)\n", iface, index, ppIBitmapFrame);
 
     if (!This->tiff)
-        return WINCODEC_ERR_WRONGSTATE;
+        return WINCODEC_ERR_FRAMEMISSING;
 
     EnterCriticalSection(&This->lock);
     res = pTIFFSetDirectory(This->tiff, index);