Encode progressive DC initial


FwStatus   fwiEncodeHuffman8x8_DCFirst_JPEG_16s1u_C1 ( const Fw16s * pSrcFw8u * pDstint dstLenBytesint * pDstCurrPosFw16s * pLastDCint Alconst FwiEncodeHuffmanSpec * pDcTableFwiEncodeHuffmanState * pEncHuffStateint bFlushState );


Al   Progressive JPEG successive approximation parameter for actual point transform.
bFlushState   Indicates the last 8X8 block in a scan.
dstLenBytes   Destination buffer length in bytes.
pDcTable   Pointer to the Huffman DC coefficient table.
pDst   Pointer to a location in a destination buffer.
pDstCurrPos   Pointer to the shift value at the current destination buffer in bytes.
pEncHuffState   Pointer to the FwiEncodeHuffmanState structure.
pLastDC   Pointer to the last DC coefficient, which is in the previous 8X8 block.
pSrc   Pointer to a location in a source buffer.


This function performs the first scan for progressive encoding of the DC coefficient of an 8X8 data block.

The encoding process follows CCITT Rec. T.81, Annex G.1.2. The function writes only full bytes to the output buffer.

Incomplete bits from data blocks in a stream are accumulated in the Huffman encode state structure.

To place all the accumulated bits in the buffer, set the bFlashState bit to 1 before processing the last 8X8 block in the stream, or restart the encoded interval.