Esme Povirk (@madewokherd) commented about dlls/d3dx9_36/surface.c:
+ + hr = IWICImagingFactory_CreateFormatConverter(wic_factory, &wic_converter); + if (FAILED(hr)) + goto exit; + + hr = IWICFormatConverter_CanConvert(wic_converter, &src_pixel_format, dst_pixel_format, &can_convert); + if (FAILED(hr)) + goto exit; + + if (!can_convert) + { + WARN("Format converting %s to %s is not supported by WIC.\n", debugstr_guid(&src_pixel_format), + debugstr_guid(dst_pixel_format)); + hr = E_NOTIMPL; + goto exit; + } There's no need to call CanConvert first, Initialize will fail for unsupported conversions.
-- https://gitlab.winehq.org/wine/wine/-/merge_requests/6704#note_85643