windowscodecs: Implement ImagingFactory_CreateDecoder.

dlls/windowscodecs/imgfactory.c

@@ -252,9 +252,83 @@ static HRESULT WINAPI ComponentFactory_CreateDecoder(IWICComponentFactory *iface
     REFGUID guidContainerFormat, const GUID *pguidVendor,
     IWICBitmapDecoder **ppIDecoder)
 {
-    FIXME("(%p,%s,%s,%p): stub\n", iface, debugstr_guid(guidContainerFormat),
+    IEnumUnknown *enumdecoders;
+    IUnknown *unkdecoderinfo;
+    IWICBitmapDecoderInfo *decoderinfo;
+    IWICBitmapDecoder *decoder = NULL, *preferred_decoder = NULL;
+    GUID vendor;
+    HRESULT res;
+    ULONG num_fetched;
+
+    TRACE("(%p,%s,%s,%p)\n", iface, debugstr_guid(guidContainerFormat),
         debugstr_guid(pguidVendor), ppIDecoder);
-    return E_NOTIMPL;
+
+    if (!guidContainerFormat || !ppIDecoder) return E_INVALIDARG;
+
+    res = CreateComponentEnumerator(WICDecoder, WICComponentEnumerateDefault, &enumdecoders);
+    if (FAILED(res)) return res;
+
+    while (!preferred_decoder)
+    {
+        res = IEnumUnknown_Next(enumdecoders, 1, &unkdecoderinfo, &num_fetched);
+        if (res != S_OK) break;
+
+        res = IUnknown_QueryInterface(unkdecoderinfo, &IID_IWICBitmapDecoderInfo, (void **)&decoderinfo);
+        if (SUCCEEDED(res))
+        {
+            GUID container_guid;
+
+            res = IWICBitmapDecoderInfo_GetContainerFormat(decoderinfo, &container_guid);
+            if (SUCCEEDED(res) && IsEqualIID(&container_guid, guidContainerFormat))
+            {
+                IWICBitmapDecoder *new_decoder;
+
+                res = IWICBitmapDecoderInfo_CreateInstance(decoderinfo, &new_decoder);
+                if (SUCCEEDED(res))
+                {
+                    if (pguidVendor)
+                    {
+                        res = IWICBitmapDecoderInfo_GetVendorGUID(decoderinfo, &vendor);
+                        if (SUCCEEDED(res) && IsEqualIID(&vendor, pguidVendor))
+                        {
+                            preferred_decoder = new_decoder;
+                            new_decoder = NULL;
+                        }
+                    }
+
+                    if (new_decoder && !decoder)
+                    {
+                        decoder = new_decoder;
+                        new_decoder = NULL;
+                    }
+
+                    if (new_decoder) IWICBitmapDecoder_Release(new_decoder);
+                }
+            }
+
+            IWICBitmapDecoderInfo_Release(decoderinfo);
+        }
+
+        IUnknown_Release(unkdecoderinfo);
+    }
+
+    IEnumUnknown_Release(enumdecoders);
+
+    if (preferred_decoder)
+    {
+        *ppIDecoder = preferred_decoder;
+        if (decoder) IWICBitmapDecoder_Release(decoder);
+        return S_OK;
+    }
+
+    if (decoder)
+    {
+        *ppIDecoder = decoder;
+        return S_OK;
+    }
+
+    *ppIDecoder = NULL;
+    return WINCODEC_ERR_COMPONENTNOTFOUND;
 }
 
 static HRESULT WINAPI ComponentFactory_CreateEncoder(IWICComponentFactory *iface,

dlls/windowscodecs/tests/bmpformat.c

@@ -1119,6 +1119,33 @@ static void test_gif_notrailer(void)
     IWICImagingFactory_Release(factory);
 }
 
+static void test_create_decoder(void)
+{
+    IWICBitmapDecoder *decoder;
+    IWICImagingFactory *factory;
+    HRESULT hr;
+
+    hr = CoCreateInstance(&CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER,
+        &IID_IWICImagingFactory, (void **)&factory);
+    ok(hr == S_OK, "CoCreateInstance error %#x\n", hr);
+
+    hr = IWICImagingFactory_CreateDecoder(factory, NULL, NULL, NULL);
+    ok(hr == E_INVALIDARG, "expected E_INVALIDARG, got %#x\n", hr);
+
+    hr = IWICImagingFactory_CreateDecoder(factory, NULL, NULL, &decoder);
+    ok(hr == E_INVALIDARG, "expected E_INVALIDARG, got %#x\n", hr);
+
+    hr = IWICImagingFactory_CreateDecoder(factory, &GUID_ContainerFormatBmp, NULL, &decoder);
+    ok(hr == S_OK, "CreateDecoder error %#x\n", hr);
+    IWICBitmapDecoder_Release(decoder);
+
+    hr = IWICImagingFactory_CreateDecoder(factory, &GUID_ContainerFormatBmp, &GUID_VendorMicrosoft, &decoder);
+    ok(hr == S_OK, "CreateDecoder error %#x\n", hr);
+    IWICBitmapDecoder_Release(decoder);
+
+    IWICImagingFactory_Release(factory);
+}
+
 START_TEST(bmpformat)
 {
     CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
@@ -1131,6 +1158,7 @@ START_TEST(bmpformat)
     test_componentinfo();
     test_createfromstream();
     test_gif_notrailer();
+    test_create_decoder();
 
     CoUninitialize();
 }