C++ Bitmap::Save方法代码示例

///Convert the given RGB array to a JPEG image. The JPEG image is returned in a BYTE array while the length of the array is returned through parameter
BYTE* convertToJPEG(BYTE* RGBArray, UINT &length) {
    BITMAPINFO bmi;											//Create bitmap header
    memset(&bmi, 0, sizeof(bmi));
    bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bmi.bmiHeader.biWidth = 1920;
    bmi.bmiHeader.biHeight = -1080;
    bmi.bmiHeader.biPlanes = 1;
    bmi.bmiHeader.biCompression = BI_RGB;
    bmi.bmiHeader.biBitCount = 24;

    Gdiplus::Bitmap* myImage = new Gdiplus::Bitmap(&bmi, RGBArray);		//Form bitmap out of provided RGB array
    IStream *jpgStream;
    CLSID jpgClsid;
    GetEncoderClsid(L"image/jpeg", &jpgClsid);				//Get the encoder
    CreateStreamOnHGlobal(NULL, TRUE, &jpgStream);			//Get direct access to physical memory. Create a stream to save directly into it. Delete when stream is released
    myImage->Save(jpgStream, &jpgClsid);					//Save the jpg image into physical memory
    STATSTG stats;
    jpgStream->Stat(&stats, STATFLAG_NONAME);				//Get stats of the jpg image; more importantly, the size
    BYTE *jpg = new BYTE[stats.cbSize.QuadPart];			//Create byte array for transferring image to.
    ULONG read;
    LARGE_INTEGER lg;
    lg.QuadPart = 0;
    jpgStream->Seek(lg, STREAM_SEEK_SET, NULL);				//Move to beginning of stream
    jpgStream->Read(jpg, stats.cbSize.QuadPart, &read);		//Read entire stream into the array
    jpgStream->Release();									//Release the stream
    length = stats.cbSize.QuadPart;							//Save the length of the byte array
    return jpg;

}

void TVizMapContext::Export(const TStr& FNm, const TStr& EncoderType, const int& Width, 
        const int& Height, const bool& ShowPointNmP, const int& PointFontSize, 
        const int& PointNmFontScale, const double& PointWgtThreshold, const bool& ShowCatNmP,
        const bool& ShowKeyWdP, const int& KeyWdFontSize, const bool& ShowMgGlassP, 
        const int& LegendGridWidth, const int& LegendGridHeight) {

    // create graphics
    Gdiplus::Bitmap* Bmp = new Gdiplus::Bitmap(Width, Height);
    Gdiplus::Graphics* g = Gdiplus::Graphics::FromImage(Bmp);
    PGks BmpGks = TWfGks::New();
    // paint graphics
    HDC HdcHandle = g->GetHDC(); BmpGks->BeginPaint(HdcHandle);
    Paint(BmpGks, ShowPointNmP, PointFontSize, PointNmFontScale,
        PointWgtThreshold, -1, ShowCatNmP, ShowKeyWdP, KeyWdFontSize, ShowMgGlassP, 
        LegendGridWidth, LegendGridHeight);
    BmpGks->EndPaint(); g->ReleaseHDC(HdcHandle);
    // save to disk
    WCHAR* FNmWChar = new WCHAR[FNm.Len() + 1];
    const int Res = MultiByteToWideChar(CP_ACP, 0, 
        FNm.CStr(), FNm.Len() + 1, FNmWChar, FNm.Len() + 1);
    CLSID pngClsid; GetEncoderClsid(EncoderType, &pngClsid);
    Bmp->Save(FNmWChar, &pngClsid, NULL);
    // clean after
    delete FNmWChar; delete Bmp; delete g;
}

static void GDIPlusDecoder(CStdValVector* data) {
	HGLOBAL hMem = ::GlobalAlloc(GMEM_FIXED, data->m_data->getLength());
	BYTE* pMem = (BYTE*)::GlobalLock(hMem);
	memcpy(pMem, data->m_data->getMemoryBase(), data->m_data->getLength());

	IStream* pIStream = 0;
	::CreateStreamOnHGlobal(hMem, FALSE, &pIStream);

	Gdiplus::Bitmap* pImgBitmap = Gdiplus::Bitmap::FromStream(pIStream);

	InitClsids();

	pIStream->Release();
	HRESULT hr = ::CreateStreamOnHGlobal(NULL, true, &pIStream);

	pImgBitmap->Save(pIStream, &s_bmpClsid, NULL);

	LARGE_INTEGER liTemp = {0};
	pIStream->Seek(liTemp, STREAM_SEEK_SET, NULL);
	
	STATSTG stats = {0};
	pIStream->Stat(&stats, 0);
	DWORD dwSize = (DWORD)stats.cbSize.QuadPart;

	delete data->m_data;
	data->m_data = new SkMemoryStream(dwSize);
	pIStream->Read((void *)data->m_data->getMemoryBase(), dwSize, NULL);

	::GlobalUnlock(hMem);
	::GlobalFree(hMem);
	pIStream->Release();

	delete pImgBitmap;
}

void SaveGIF(HBITMAP hBmp, TCHAR* szFilename) {
	Gdiplus::GdiplusStartupInput gdiplusStartupInput;
	ULONG_PTR                    gdiplusToken;
	Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

	Gdiplus::Bitmap *pBitmap = Gdiplus::Bitmap::FromHBITMAP(hBmp, (HPALETTE)GetStockObject(DEFAULT_PALETTE) );
	if( pBitmap ) {
		// Get the CLSID of the GIF encoder.
		CLSID clsidEncoder;
		if( GetEncoderClsid(L"image/gif", clsidEncoder)) {
			LPWSTR pswFile = mir_t2u(szFilename);
			pBitmap->Save((const WCHAR*)pswFile, &clsidEncoder, NULL);
			mir_free(pswFile);
		}
		delete pBitmap;
	}
	Gdiplus::GdiplusShutdown(gdiplusToken);
}

void SaveTIF(HBITMAP hBmp, TCHAR* szFilename)
{
	//http://www.codeproject.com/Messages/1406708/How-to-reduce-the-size-of-an-Image-using-GDIplus.aspx
	ULONG_PTR						gdiplusToken;
	Gdiplus::GdiplusStartupInput	gdiplusStartupInput;
	Gdiplus::Status stat;
	Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

	Gdiplus::Bitmap *pBitmap = Gdiplus::Bitmap::FromHBITMAP(hBmp, (HPALETTE)GetStockObject(DEFAULT_PALETTE));
	if (pBitmap) {
		// Get the CLSID of the GIF encoder.
		CLSID EncCLSID;
		if (GetEncoderClsid(L"image/tiff", EncCLSID)) {
			//--- Create a 2-parameter array, for Compression and for Color Bit depth
			Gdiplus::EncoderParameters* EncParams = (Gdiplus::EncoderParameters*) malloc(sizeof(Gdiplus::EncoderParameters) + 1 * sizeof(Gdiplus::EncoderParameter));
			//	Gdiplus::EncoderParameters pEncoderParameters;
			//--- Use LZW Compression instead of Group 4, since it works for color and G4 doesn't
			ULONG ulCompression = Gdiplus::EncoderValueCompressionLZW;
			ULONG ulColorDepth = 24L;

			EncParams->Count = 2;
			EncParams->Parameter[0].Guid = Gdiplus::EncoderCompression;
			EncParams->Parameter[0].Type = Gdiplus::EncoderParameterValueTypeLong;
			EncParams->Parameter[0].NumberOfValues = 1;
			EncParams->Parameter[0].Value = &ulCompression;
			EncParams->Parameter[1].Guid = Gdiplus::EncoderColorDepth;
			EncParams->Parameter[1].Type = Gdiplus::EncoderParameterValueTypeLong;
			EncParams->Parameter[1].NumberOfValues = 1;
			EncParams->Parameter[1].Value = &ulColorDepth;

			LPWSTR pswFile = mir_t2u(szFilename);
			stat = pBitmap->Save((const WCHAR*)pswFile, &EncCLSID, EncParams);
			mir_free(pswFile);
			free(EncParams);
		}
		delete pBitmap;
	}
	Gdiplus::GdiplusShutdown(gdiplusToken);
}

		void GdiPlusAccess::SaveBitmap(Gdiplus::Bitmap &bmp, const Core::String &fileName, const GUID &format) {
			CLSID encoder;
			GetEncoderCLSID(format, encoder);
			AssertGDIPlusSuccess(bmp.Save(*fileName, &encoder, nullptr), "cannot save bitmap");
		}