windowscodecs: Add helper to create internal COM classes without CoCreateInstance call if possible.

dlls/windowscodecs/clsfactory.c

@@ -202,3 +202,14 @@ HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID iid, LPVOID *ppv)
     TRACE("<-- %08X\n", ret);
     return ret;
 }
+
+HRESULT create_instance(CLSID *clsid, const IID *iid, void **ppv)
+{
+    int i;
+
+    for (i=0; wic_classes[i].classid; i++)
+        if (IsEqualCLSID(wic_classes[i].classid, clsid))
+            return wic_classes[i].constructor(iid, ppv);
+
+    return CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER, iid, ppv);
+}

dlls/windowscodecs/info.c

@@ -623,8 +623,7 @@ static HRESULT WINAPI BitmapDecoderInfo_CreateInstance(IWICBitmapDecoderInfo *if
 
     TRACE("(%p,%p)\n", iface, ppIBitmapDecoder);
 
-    return CoCreateInstance(&This->clsid, NULL, CLSCTX_INPROC_SERVER,
-        &IID_IWICBitmapDecoder, (void**)ppIBitmapDecoder);
+    return create_instance(&This->clsid, &IID_IWICBitmapDecoder, (void**)ppIBitmapDecoder);
 }
 
 static const IWICBitmapDecoderInfoVtbl BitmapDecoderInfo_Vtbl = {
@@ -917,8 +916,7 @@ static HRESULT WINAPI BitmapEncoderInfo_CreateInstance(IWICBitmapEncoderInfo *if
 
     TRACE("(%p,%p)\n", iface, ppIBitmapEncoder);
 
-    return CoCreateInstance(&This->clsid, NULL, CLSCTX_INPROC_SERVER,
-        &IID_IWICBitmapEncoder, (void**)ppIBitmapEncoder);
+    return create_instance(&This->clsid, &IID_IWICBitmapEncoder, (void**)ppIBitmapEncoder);
 }
 
 static const IWICBitmapEncoderInfoVtbl BitmapEncoderInfo_Vtbl = {
@@ -1125,8 +1123,8 @@ static HRESULT WINAPI FormatConverterInfo_CreateInstance(IWICFormatConverterInfo
 
     TRACE("(%p,%p)\n", iface, ppIFormatConverter);
 
-    return CoCreateInstance(&This->clsid, NULL, CLSCTX_INPROC_SERVER,
-        &IID_IWICFormatConverter, (void**)ppIFormatConverter);
+    return create_instance(&This->clsid, &IID_IWICFormatConverter,
+            (void**)ppIFormatConverter);
 }
 
 static BOOL ConverterSupportsFormat(IWICFormatConverterInfo *iface, const WCHAR *formatguid)
@@ -1871,8 +1869,7 @@ static HRESULT WINAPI MetadataReaderInfo_CreateInstance(IWICMetadataReaderInfo *
 
     TRACE("(%p,%p)\n", iface, reader);
 
-    return CoCreateInstance(&This->clsid, NULL, CLSCTX_INPROC_SERVER,
-                            &IID_IWICMetadataReader, (void **)reader);
+    return create_instance(&This->clsid, &IID_IWICMetadataReader, (void **)reader);
 }
 
 static const IWICMetadataReaderInfoVtbl MetadataReaderInfo_Vtbl = {

dlls/windowscodecs/tests/gifformat.c

@@ -25,6 +25,8 @@
 #include "wincodec.h"
 #include "wine/test.h"
 
+HRESULT WINAPI WICCreateImagingFactory_Proxy(UINT, IWICImagingFactory**);
+
 static const char gif_global_palette[] = {
 /* LSD */'G','I','F','8','7','a',0x01,0x00,0x01,0x00,0xa1,0x02,0x00,
 /* palette */0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,
@@ -344,4 +346,14 @@ START_TEST(gifformat)
 
     IWICImagingFactory_Release(factory);
     CoUninitialize();
+
+    /* run the same tests with no COM initialization */
+    hr = WICCreateImagingFactory_Proxy(WINCODEC_SDK_VERSION, &factory);
+    ok(hr == S_OK, "WICCreateImagingFactory_Proxy error %#x\n", hr);
+
+    test_global_gif_palette();
+    test_global_gif_palette_2frames();
+    test_local_gif_palette();
+
+    IWICImagingFactory_Release(factory);
 }

dlls/windowscodecs/wincodecs_private.h

@@ -67,6 +67,8 @@ DECLARE_INTERFACE_(IMILUnknown2,IUnknown)
 };
 #undef INTERFACE
 
+HRESULT create_instance(CLSID *clsid, const IID *iid, void **ppv) DECLSPEC_HIDDEN;
+
 typedef HRESULT(*class_constructor)(REFIID,void**);
 extern HRESULT FormatConverter_CreateInstance(REFIID riid, void** ppv) DECLSPEC_HIDDEN;
 extern HRESULT ComponentFactory_CreateInstance(REFIID riid, void** ppv) DECLSPEC_HIDDEN;