FejdZddlmZddlZddlZdZdZejddZdZ d Z d d Z d d Z y)zPNG image manipulation helpers.) annotationsN !i s tEXtDepths IENDB`c0t|d5}|jttz d|j t}|j t tzs dddytjd|dddcdddS#1swYyxYw)zARead the special tEXt chunk indicating the depth from a PNG file.rbNrr) openseekLEN_IEND LEN_DEPTHread startswithDEPTH_CHUNK_LENDEPTH_CHUNK_STARTstructunpack)filenamef depthchunks 1/usr/lib/python3/dist-packages/sphinx/util/png.pyread_png_depthrs h = (Y&'+VVI& $$_7H%HI ====z"R'89!<===sAB 'B  Bctjd|}t|d5}|jt d|j t tz|ztjt|zdz}|j tjd||j tdddy#1swYyxYw)zWrite the special tEXt chunk indicating the depth to a PNG file. The chunk is placed immediately before the special IEND chunk. rzr+br lz!IN) rpackr rrwriterrbinasciicrc32 IEND_CHUNK)rdepthdatarcrcs rwrite_png_depthr%s ;;tU #D h  ! y! "33d:;nn.56C  D#&'     s BB<<C)rstrreturnz int | None)rr&r"intr'None) __doc__ __future__rrrrrrrrr!rr%rr.sB%"   &++dB'$ 4  =r-