7 fhdZddlmZddlZddlZdZdZejddZdZ d Z ddZ ddZ dS)zPNG image manipulation helpers.) annotationsN !i s tEXtDepths IENDB`filenamestrreturn int | Nonecxt|d5}|ttz d|t}|t tzs ddddStj d|dddcdddS#1swxYwYdS)zARead the special tEXt chunk indicating the depth from a PNG file.rbNrr) openseekLEN_IEND LEN_DEPTHread startswithDEPTH_CHUNK_LENDEPTH_CHUNK_STARTstructunpack)rf depthchunks E/var/www/equiseq/venv/lib/python3.11/site-packages/sphinx/util/png.pyread_png_depthrs h  = (Y&'+++VVI&& $$_7H%HII = =========z"R%'899!<==================sA"B/"B//B36B3depthintNonectjd|}t|d5}|t d|t tz|ztj t|zdz}|tjd||tddddS#1swxYwYdS)zWrite the special tEXt chunk indicating the depth to a PNG file. The chunk is placed immediately before the special IEND chunk. rzr+brlz!IN) rpackrrrwriterrbinasciicrc32 IEND_CHUNK)rrdatarcrcs rwrite_png_depthr*s ;tU # #D h   ! y! "33d:;;;n.566C  D#&&'''                    sB#CCC)rr r r )rr rr r r!) __doc__ __future__rr%rrrr#rrr'rr*rr/s%%""""""   &+dB''$ 4  = = = =r.