WICSample.cpp

#include <SDKDDKVer.h>
#include <Windows.h>
#include <wincodec.h>
#include <comdef.h>
#include <wrl.h>

HRESULT test()
{
	HRESULT hr;

	Microsoft::WRL::ComPtr<IWICImagingFactory> wicFactory;
	hr = CoCreateInstance(CLSID_WICImagingFactory, nullptr, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&wicFactory));
	if (FAILED(hr)) {
		return hr;
	}

	Microsoft::WRL::ComPtr<IWICBitmapDecoder> wicDecoder;
	hr = wicFactory->CreateDecoderFromFilename(L"BwYnbOQCIAANnZ9.jpg", nullptr, GENERIC_READ, WICDecodeMetadataCacheOnDemand, &wicDecoder);
	if (FAILED(hr)) {
		return hr;
	}

	// BitmapFrameDecoderは BitmapSouceを継承
	Microsoft::WRL::ComPtr<IWICBitmapFrameDecode> wicFrameDecode;
	hr = wicDecoder->GetFrame(0, &wicFrameDecode);
	if (FAILED(hr)) {
		return hr;
	}

	UINT w, h;
	WICPixelFormatGUID pixelFormat;
	
	hr = wicFrameDecode->GetSize(&w, &h);
	if (FAILED(hr)) {
		return hr;
	} else {
		wprintf(L"w=%d h=%d\n", w, h);
	}
	hr = wicFrameDecode->GetPixelFormat(&pixelFormat);
	if (FAILED(hr)) {
		return hr;
	} else {
		WCHAR s[MAX_PATH];
		StringFromGUID2(pixelFormat, s, MAX_PATH);
		wprintf(L"%s\n", s);
	}

	Microsoft::WRL::ComPtr<IWICStream> wicOutputStream;
	hr = wicFactory->CreateStream(&wicOutputStream);
	if (FAILED(hr)) {
		return hr;
	}
	hr = wicOutputStream->InitializeFromFilename(L"outputFile.bmp", GENERIC_WRITE);
	if (FAILED(hr)) {
		return hr;
	}

	Microsoft::WRL::ComPtr<IWICBitmapEncoder> wicEncoder;
	hr = wicFactory->CreateEncoder(GUID_ContainerFormatBmp, nullptr, &wicEncoder);
	if (FAILED(hr)) {
		return hr;
	}
	hr = wicEncoder->Initialize(wicOutputStream.Get(), WICBitmapEncoderNoCache);
	if (FAILED(hr)) {
		return hr;
	}

	Microsoft::WRL::ComPtr<IWICBitmapFrameEncode> wicFrameEncode;
	hr = wicEncoder->CreateNewFrame(&wicFrameEncode, nullptr);
	if (FAILED(hr)) {
		return hr;
	}
	hr = wicFrameEncode->Initialize(nullptr);
	if (FAILED(hr)) {
		return hr;
	}
	hr = wicFrameEncode->SetSize(w, h);
	if (FAILED(hr)) {
		return hr;
	}
	hr = wicFrameEncode->SetPixelFormat(&pixelFormat);
	if (FAILED(hr)) {
		return hr;
	}
	hr = wicFrameEncode->WriteSource(wicFrameDecode.Get(), nullptr);
	if (FAILED(hr)) {
		return hr;
	}
	hr = wicFrameEncode->Commit();
	if (FAILED(hr)) {
		return hr;
	}
	hr = wicEncoder->Commit();
	if (FAILED(hr)) {
		return hr;
	}

	return hr;
}

int main()
{
	HRESULT hr;
	
	hr = CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED|COINIT_DISABLE_OLE1DDE);
	if (FAILED(hr)) {
		return static_cast<int>(hr);
	}

	hr = test();
	if (FAILED(hr)) {
		return static_cast<int>(hr);
	}

	CoUninitialize();
    return static_cast<int>(hr);
}