File difference report generated by CSDiff by ComponentSoftware on 10/10/2004 10:39 PM

Base file: D:\Dev\cximage\libs\jpeg-6b\jdhuff.c
Compared file: D:\Dev\cximage\cximage599b\jpeg\jdhuff.c

651a652,683
> /*
>  * BEWARE OF KLUDGE:  This subroutine is a hack for decoding illegal JPEG-in-
>  *                    TIFF encapsulations produced by Microsoft's Wang Imaging
>  * for Windows application with the public-domain TIFF Library.  Based upon an
>  * examination of selected output files, this program apparently divides a JPEG
>  * bit-stream into consecutive horizontal TIFF "strips", such that the JPEG
>  * encoder's/decoder's DC coefficients for each image component are reset before
>  * each "strip".  Moreover, a "strip" is not necessarily encoded in a multiple
>  * of 8 bits, so one must sometimes discard 1-7 bits at the end of each "strip"
>  * for alignment to the next input-Byte storage boundary.  IJG JPEG Library
>  * decoder state is not normally exposed to client applications, so this sub-
>  * routine provides the TIFF Library with a "hook" to make these corrections.
>  * It should be called after "jpeg_start_decompress()" and before
>  * "jpeg_finish_decompress()", just before decoding each "strip" using
>  * "jpeg_read_raw_data()" or "jpeg_read_scanlines()".
>  *
>  * This kludge is not sanctioned or supported by the Independent JPEG Group, and
>  * future changes to the IJG JPEG Library might invalidate it.  Do not send bug
>  * reports about this code to IJG developers.  Instead, contact the author for
>  * advice: Scott B. Marovich <marovich@hpl.hp.com>, Hewlett-Packard Labs, 6/01.
>  */
> GLOBAL(void)
> jpeg_reset_huff_decode (register j_decompress_ptr cinfo,register float *refbw)
> { register huff_entropy_ptr entropy = (huff_entropy_ptr)cinfo->entropy;
>   register int ci = 0;
> 
>   /* Re-initialize DC predictions */
>   do entropy->saved.last_dc_val[ci] = (int)-refbw[ci << 1];
>   while (++ci < cinfo->comps_in_scan);
>   /* Discard encoded input bits, up to the next Byte boundary */
>   entropy->bitstate.bits_left &= ~7;
> }


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