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bmp,gif,jpg,pngの画像ファイルをID2D1Bitmapへ変換するサンプルです。
LoadImage内でファイルをbinaryで取得しStreamへ変換しID2D1Bitmapを作成します。
なお、ID2D1RenderTargetを再構築するとID2D1Bitmapも作り直しが必要なので、StreamかFileNameは
どこかで保持する必要があります。

Binaryクラスはここです。

#include "stdafx.h"

#include "binary.h"

#include 
bool LoadImage( LPCWSTR filename, ID2D1RenderTarget* target, ID2D1Bitmap** ret )

{

	CComPtr sm;

	CComPtr bmp;
	Binary bin;

	bool bl;

	bl = BinaryFromFile(filename, bin);

	bl = BinaryToIStream( bin, &sm );

	bl = LoadImageFromIStream1( target, sm, &bmp);

	

	*ret = bmp.Detach();

	(*ret)->AddRef();

	

	return true;

}




bool BinaryFromFile( LPCWSTR fnm, Binary& ret )

{

	HANDLE h = CreateFile( fnm, GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL );
	if ( h != INVALID_HANDLE_VALUE )

	{

		DWORD len = GetFileSize( h, NULL );
		Binary bin(0,len);		

		DWORD lx=0; 
		::ReadFile( h,bin.get(), len,&lx,0);
		ret = bin;
		::CloseHandle(h);

		return true;

	}
	return false;

}

bool BinaryToIStream( const Binary& bin, IStream** ret )

{	

	HGLOBAL	hMem = ::GlobalAlloc(GMEM_MOVEABLE, bin.length());

	LPVOID pImage = ::GlobalLock(hMem);

	memcpy(pImage, bin.get(), bin.length());

	::GlobalUnlock(hMem);
	CComPtr spStream;

	if ( S_OK == ::CreateStreamOnHGlobal(hMem,TRUE, &spStream ))

	{	

		*ret = spStream;

		(*ret)->AddRef();

		return true;

	}

	return false;

}




bool LoadImageFromIStream1( ID2D1RenderTarget* target, IStream* sm, ID2D1Bitmap** bmp )

{

	HRESULT hr;

	CComPtr pStream;

	CComPtr pWICFactory;	
	hr = CoCreateInstance( CLSID_WICImagingFactory, NULL, CLSCTX_ALL, __uuidof(IWICImagingFactory), (void**)&pWICFactory );

	if ( hr != S_OK ) return false;
	hr = pWICFactory->CreateStream( &pStream );

	if ( hr != S_OK ) return false;

	

	hr = pStream->InitializeFromIStream( sm ); // bmp,gif,jpg,png OK

	if ( hr != S_OK ) return false;

	
	CComPtr pDecoder;

	CComPtr pSource;	

	CComPtr pConverter;
	hr = pWICFactory->CreateDecoderFromStream( pStream, 0, WICDecodeMetadataCacheOnLoad, &pDecoder );

	if ( hr != S_OK ) return false;

	hr = pDecoder->GetFrame(0, &pSource);

	if ( hr != S_OK ) return false;
	// Convert the image format to 32bppPBGRA

	// (DXGI_FORMAT_B8G8R8A8_UNORM + D2D1_ALPHA_MODE_PREMULTIPLIED).

	hr = pWICFactory->CreateFormatConverter(&pConverter);

	if ( hr != S_OK ) return false;

	hr = pConverter->Initialize( pSource, GUID_WICPixelFormat32bppPBGRA,WICBitmapDitherTypeNone,NULL,0.f,WICBitmapPaletteTypeMedianCut);

	if ( hr != S_OK ) return false;

	hr = target->CreateBitmapFromWicBitmap(pConverter,NULL,bmp );
	return ( hr == S_OK );

}