PDF Presentation - Uplinq

JPEG Decoding Optimization
• 5Mp image decoding time vastly improved with 1/8 scaling factor
• IDownSample API: Integer DownScaling While decoding (1/8, 1/4, /1/2)
• AEECLSID_GenericViewerAsync: Prevent hogging UI while decoding
• Also a great memory saving as the generated bitmaps are close to QVGA
IDownSample Fidelity Window
Scaled Decoded Image
Factor 1/8 or 1/4 or 1/2 or 1:1
Factor selected against the
fidelity size.
The highest scaling factor
meeting the fidelity minimum size
requirement
ERR_BAIL(IEnv_CreateInstance(pMe CreateInstance(pMe->piEnv, AEECLSID_JPEGDecoder, (void **)&piImageDecoder));
nErr= IIMAGEDECODER_QueryInterface(piImageDecoder,AEEIID_IDownSample,(void**)&piDownSample)
if(AEE_SUCCESS == nErr)
{
if (NULL != piDownSample){
IDownSample_SetTargetFidelity(piDownSample, fidelityX, fidelityY);
}
}
ERR_BAIL(IEnv_CreateInstance(pMe->piEnv, AEECLSID_GenericViewerAsync, (void **)&piImage));
IImage_SetParm(piImage, IPARM_DECODER, (int)piImageDecoder, 0);
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