HRESULT ConvertBitmapSource( RECT rcDest, IWICBitmapSource*& pToRenderBitmapSource )
{
HRESULT hr = S_OK;
IWICBitmapScaler* pScaler = nullptr;
WICPixelFormatGUID pxformat;
IWICFormatConverter* pConverter = nullptr;
pToRenderBitmapSource = nullptr;
// Get the client Rect
//RECT rcClient = rcDest;
//hr = GetClientRect(hWnd, &rcClient) ? S_OK: E_FAIL;
if( SUCCEEDED( hr ) )
{
// Create a BitmapScaler
hr = g_UserImageFactoryInst.m_pIWICFactory->CreateBitmapScaler( &pScaler );
//hr = IWICImagingFactory_CreateBitmapScaler( g_UserImageFactoryInst.m_pIWICFactory, &pScaler );
// Initialize the bitmap scaler from the original bitmap map bits
if( SUCCEEDED( hr ) )
{
pScaler->Initialize( g_UserImageFactoryInst.m_pOriginalBitmapSource,
rcDest.right - rcDest.left,
rcDest.bottom - rcDest.top,
WICBitmapInterpolationModeFant );
}
//hr = IWICBitmapScaler_GetPixelFormat( pScaler, &pxformat );
hr = pScaler->GetPixelFormat( &pxformat );
// Format convert the bitmap into 32bppBGR, a convenient
// pixel format for GDI rendering
if( SUCCEEDED( hr ) )
{
//hr = IWICImagingFactory_CreateFormatConverter( g_UserImageFactoryInst.m_pIWICFactory, &pConverter );
hr = g_UserImageFactoryInst.m_pIWICFactory->CreateFormatConverter( &pConverter );
// Format convert to 32bppBGR
if( SUCCEEDED( hr ) )
{
hr = pConverter->Initialize( static_cast<IWICBitmapSource*>( pScaler ), // Input bitmap to convert
GUID_WICPixelFormat32bppBGR, // &GUID_WICPixelFormat32bppBGR,
WICBitmapDitherTypeNone, // Specified dither patterm
NULL, // Specify a particular palette
0.f, // Alpha threshold
WICBitmapPaletteTypeCustom ); // Palette translation type
// Store the converted bitmap as ppToRenderBitmapSource
if( SUCCEEDED( hr ) )
pConverter->QueryInterface( IID_IWICBitmapSource, reinterpret_cast<void**>( &pToRenderBitmapSource ) );
}
SAFE_RELEASE( pConverter );
}
SAFE_RELEASE( pScaler );
}
return hr;
}
