IWICLeadBitmapEncoder::GetSubFormats Method

Returns S_OK if successful, or an error value otherwise.

This method fills an array with the valid sub-formats for particular LEAD bitmap encoder. Call GetSubFormats once to get the number of sub-formats. Allocate the appropriate sized array. Then call GetSubFormats again passing the allocated array as an argument.

Calling the GetSubFormatFlags method on each of the sub-formats returns flags that specify the supported options for the sub-format . The (sub-format)/(sub-format flag) pair is unique . The friendly-name for the (sub-format)/sub-format flag) pair can be obtained by calling the GetSubFormatFriendlyName method. Since it is the (sub-format)/(sub-format flag) pair that is unique, the array of sub-formats can contain duplicate values.

Example1:
A LEAD object implementing the IWICLeadBitmapEncoder interface is created using the class id CLSID_WICLeadCmpEncoder. For a pixel format of GUID_WICPixelFormat24bppBGR, the GetSubFormats method will return an array of two values (shown in the first column below). Calling the GetSubFormatFlags method on each of the sub-formats returns the flags that specify options for the sub-format (shown in second column). Finally, the friendly name is obtained by calling GetSubFormatFriendlyName.

WICLeadSubFormat	WICLeadSubFormatFlags	Friendly Name
WICLeadSubFormatCmp	WICLeadFlagStamp WICLeadFlagQualityFactor WICLeadFlagCmpQualityFactorPredefined	Progressive
WICLeadSubFormatCmp	Stamp WICLeadFlagQualityFactor WICLeadFlagCmpQualityFactorPredefined Progressive	Progressive

Example 2:
The IWICLeadBitmapEncoder object is created using with CLSID_WICLeadJpegEncoder using GUID_WICPixelFormat24bppBGR. The GetSubFormats method will return an array of ten values. The results are shown in the following table.

WICLeadBitmapEncoderSubFormat	WICLeadBitmapEncoderSubFormatFlags	Friendly Name
WICLeadSubFormatJpeg	WICLeadFlagQualityFactor WICLeadFlagStamp	Yuv 4:4:4
WICLeadSubFormatJpeg422	WICLeadFlagQualityFactor WICLeadFlagStamp	Yuv 4:2:2
WICLeadSubFormatJpeg411	WICLeadFlagQualityFactor WICLeadFlagStamp	Yuv 4:1:1
WICLeadSubFormatJpeg	WICLeadFlagProgressive WICLeadFlagQualityFactor WICLeadFlagStamp	Progressive 444
WICLeadSubFormatJpeg422	WICLeadFlagProgressive WICLeadFlagQualityFactor WICLeadFlagWICLeadFlagStamp	Progressive 422
WICLeadSubFormatJpeg411	WICLeadFlagProgressive WICLeadFlagQualityFactor WICLeadFlagStamp	Progressive 411
WICLeadSubFormatJpeg	WICLeadFlagStamp WICLeadFlagLosslessJpeg	Lossless
WICLeadSubFormatJpegLab	WICLeadFlagQualityFactor WICLeadFlagStamp	Lab 4:4:4
WICLeadSubFormatJpegLab422	WICLeadFlagQualityFactor WICLeadFlagStamp	Lab 4:2:2
WICLeadSubFormatJpegLab411	WICLeadFlagQualityFactor WICLeadFlagStamp	Lab 4:1:1

            // This example displays all the subformats and flags for the LEAD Jpeg Encoder
            // Refer to the Example Requirements for help in running this sample
            
            // MyGetSubFormatFriendlyName gets the friendly name of the subformat
            CString MyGetSubFormatFriendlyName(IWICLeadBitmapEncoder *piLeadBitmapEncoder, WICPixelFormatGUID guidPixelFormat, UINT uSubformatIndex)
            {
               CString csRet;
               HRESULT hr = S_OK;
               UINT uActual = 0;
               WCHAR *pwzFriendlyName = NULL; 
            
               if (piLeadBitmapEncoder)
               {
                  IWICBitmapEncoder *piBitmapEncoder = NULL;
            
                  // Get subformat friendly name
                  IFS(piLeadBitmapEncoder->GetSubFormatFriendlyName(guidPixelFormat, uSubformatIndex, 0, NULL, &uActual));
                  if (uActual > 0)
                  {
                     pwzFriendlyName = new WCHAR[uActual];
                     if (pwzFriendlyName)
                     {
                        IFS(piLeadBitmapEncoder->GetSubFormatFriendlyName(guidPixelFormat, uSubformatIndex, uActual, pwzFriendlyName, &uActual));
                        if (SUCCEEDED(hr))
                           csRet = pwzFriendlyName;
                     }
                  }
               }
               DELETE_POINTER(pwzFriendlyName);
               return csRet;
            }
            
            CString MyGetSubFormatFlagString(WICLeadSubFormatFlags uFlags)
            {
               CString csRet;
            
               if (uFlags == 0)
                  csRet = L"WICLeadFlagNone";
            
               if (uFlags & WICLeadFlagProgressive)
                  csRet = csRet + L"\nWICLeadFlagProgressive";
            
               if (uFlags & WICLeadFlagCmpQualityFactorPredefined)
                  csRet = csRet + L"\nWICLeadFlagCmpQualityFactorPredefined";
            
             if (uFlags & WICLeadFlagQualityFactor)
                  csRet = csRet + L"\nWICLeadFlagQualityFactor";
            
             if (uFlags & WICLeadFlagMultiPage)
                  csRet = csRet + L"\nWICLeadFlagMultiPage";
            
             if (uFlags & WICLeadFlagStamp)
                  csRet = csRet + L"\nWICLeadFlagStamp";
            
             if (uFlags & WICLeadFlagLosslessJpeg)
                  csRet = csRet + L"\nWICLeadFlagLosslessJpeg";
            
             if (uFlags & WICLeadFlagJpeg2000Basic)
                  csRet = csRet + L"\nWICLeadFlagJpeg2000Basic";
            
             if (uFlags & WICLeadFlagJpeg2000Advanced)
                  csRet = csRet + L"\nWICLeadFlagJpeg2000Advanced";
            
             if (uFlags & WICLeadFlagPngQualityFactor)
                  csRet = csRet + L"\nWICLeadFlagPngQualityFactor";
            
             if (uFlags & WICLeadFlagAbcQualityFactor)
                  csRet = csRet + L"\nWICLeadFlagAbcQualityFactor";
            
             if (uFlags & WICLeadFlagEcwQualityFactor)
                  csRet = csRet + L"\nWICLeadFlagEcwQualityFactor";
            
             if (uFlags & WICLeadFlagJpeg2000AlphaChannel)
                  csRet = csRet + L"\nWICLeadFlagJpeg2000AlphaChannel";
            
             if (uFlags & WICLeadFlagJbig2Support)
                  csRet = csRet + L"\nWICLeadFlagJbig2Support";
            
             if (uFlags & WICLeadFlagXpsPngQualityFactor)
                  csRet = csRet + L"\nWICLeadFlagXpsPngQualityFactor";
            
             if (uFlags & WICLeadFlagXpsJpegQualityFactor)
                  csRet = csRet + L"\nWICLeadFlagXpsJpegQualityFactor";
            
             if (uFlags & WICLeadFlagJpeg2000QualityFactor)
                  csRet = csRet + L"\nWICLeadFlagJpeg2000QualityFactor";
            
             if (uFlags & WICLeadFlagHdpQualityFactor)
                  csRet = csRet + L"\nWICLeadFlagHdpQualityFactor";
            
             if (uFlags & WICLeadFlagInterlaced)
                  csRet = csRet + L"\nWICLeadFlagInterlaced";
            
             if (uFlags & WICLeadFlagDither)
                  csRet = csRet + L"\nWICLeadFlagDither";
            
               return csRet;
            }
            
            HRESULT IWICLeadBitmapEncoder_GetSubFormats(HWND hWnd)
            {
               HRESULT hr = S_OK;
               IWICImagingFactory *piImagingFactory = NULL;
               IWICBitmapEncoder *piBitmapEncoder = NULL;
               IWICLeadBitmapEncoder *piLeadBitmapEncoder = NULL;
               CString csExampleName = L"IWICLeadBitmapEncoder_GetSubFormats";
               CString csMsg = csExampleName + "\n\n";
               GUID guidContainerFormat = GUID_ContainerFormatLeadJpeg;
               WICPixelFormatGUID guidPixelFormat = GUID_WICPixelFormat24bppBGR;
            
               // Create a LEAD Jpeg Bitmap Encoder
               IFS(CoCreateInstance(CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, IID_IWICImagingFactory, (LPVOID*) &piImagingFactory));
               IFS(piImagingFactory->CreateEncoder(guidContainerFormat, NULL, &piBitmapEncoder));
            
               // QueryInterface on the encoder to get the IWICLeadBitmapEncoder interface
               IFS(piBitmapEncoder->QueryInterface(IID_WICLeadBitmapEncoder, reinterpret_cast<void**>(&piLeadBitmapEncoder)));
            
               // first call to get number of subformats
               UINT uSubFormats = 0;
               WICLeadSubFormat *pSubFormats = NULL;
               IFS(piLeadBitmapEncoder->GetSubFormats(guidPixelFormat, 0, NULL, &uSubFormats));
               if (SUCCEEDED(hr))
               {
                  pSubFormats = new WICLeadSubFormat[uSubFormats];
                  if (pSubFormats)
                  {
                     // second call to get the subformats
                     IFS(piLeadBitmapEncoder->GetSubFormats(guidPixelFormat, uSubFormats, pSubFormats, &uSubFormats));
                  }
               }
            
               // Display the subformat friendly name, and flags
               for (UINT i = 0; i < uSubFormats; i++)
               {
                  CString csSubFormat =  MyGetSubFormatFriendlyName(piLeadBitmapEncoder, guidPixelFormat, i);
                  WICLeadSubFormatFlags uFlags = WICLeadFlagNone;
            
                  IFS(piLeadBitmapEncoder->GetSubFormatFlags(guidPixelFormat, i, &uFlags));
                  CString csFlag = MyGetSubFormatFlagString(uFlags);
                  CString csOut;
                  csOut = csSubFormat + csFlag + L"\n\n";
                  csMsg = csMsg + csOut;
               }
            
               RELEASE_INTERFACE(piLeadBitmapEncoder);
               RELEASE_INTERFACE(piBitmapEncoder);
               RELEASE_INTERFACE(piImagingFactory);
            
               DELETE_POINTER(pSubFormats);
            
               MessageBox(hWnd, csMsg, csExampleName, MB_OK);
               return hr;
            }