Add rudimentary PDF/A-2b support

Redo merge request !32 (closed) using the pdfx package and avoid command line hassle using \pdfcreationdate.

RGB logo images are from !32 (closed), unknown to me how these are created.

liuthesis.cls

@@ -118,6 +118,7 @@
 \createvariable{examiner}
 \createvariable{titleenglish}
 \createvariable{titleswedish}
+\renewcommand{\@title}{\ifx\@titleenglish\@empty\@titleswedish\else\@titleenglish\fi}
 \createvariable{keywords}
 \createvariable{keywordsswedish}
 \createvariable{department}
@@ -301,14 +302,72 @@
 
 \LoadClass{memoir}
 
-\RequirePackage{color}
-\RequirePackage[svgnames]{xcolor}
+\RequirePackage[cmyk,svgnames,hyperref]{xcolor}
 \RequirePackage{pdfpages}
 \RequirePackage{tikz}
 \RequirePackage{pbox}
 \RequirePackage{ifthen}
 \RequirePackage{geometry}
-\RequirePackage[pdfusetitle]{hyperref}
+%%%%%%%%%% PDF/A and PDF/X support
+% https://tex.stackexchange.com/questions/474197/pdfx-incomplete-cidset-in-some-fonts/474336#474336
+\ifluatex
+\pdfvariable omitcidset=1
+\fi
+\RequirePackage[pdfa,pdfusetitle,bookmarks=false]{hyperref} %bookmarks are incompatible with PDF/X<6
+\RequirePackage{hyperxmp}[2020/06/15]
+\RequirePackage{cmap}
+\RequirePackage{colorprofiles}
+\ifxetex
+  \def\OBJ@CMYK{@colorprofile}%
+  \immediate\special{pdf:fstream \OBJ@CMYK (\colorpro@cmyk@profile) <</N 4>>}%
+  \def\pdfcatalog#1{\special{pdf:put @catalog <<#1>>}}
+  \def\pdfpageattr#1{\special{pdf:put @thispage <<#1>>}}
+\else
+  \immediate\pdfobj stream attr{/N 4} file {\colorpro@cmyk@profile}%
+  \edef\OBJ@CMYK{\the\pdflastobj\space 0 R}%
+\fi
+\pdfcatalog{%
+  /OutputIntents [ <<
+    /Type /OutputIntent
+    /S/GTS_PDFA1
+    /DestOutputProfile \OBJ@CMYK
+    /OutputConditionIdentifier (\colorpro@cmyk@intent)
+    /Info(FOGRA39L)
+    /OutputCondition(\colorpro@cmyk@identifier)
+    /RegistryName(\colorpro@cmyk@registry)
+  >>
+  <<
+    /Type /OutputIntent
+    /S/GTS_PDFX
+    /DestOutputProfile \OBJ@CMYK
+    /OutputConditionIdentifier (\colorpro@cmyk@intent)
+    /Info(FOGRA39L)
+    /OutputCondition(\colorpro@cmyk@identifier)
+    /RegistryName(\colorpro@cmyk@registry)
+  >> ]
+}
+% Bugfix of hyperref to produce CMYK links
+\let\HyColor@HyperrefBorderColor\HyColor@XZeroOneThreeFour
+% Tell PDF/X the final format of the paper
+\@tempdima=0.99626400996264009962\paperwidth
+\edef\boxwd{\strip@pt\@tempdima}
+\@tempdima=0.99626400996264009962\paperheight
+\edef\boxht{\strip@pt\@tempdima}
+\edef\next{%
+  \protect\pdfpageattr{
+    /TrimBox[0.0 0.0 \boxwd\space \boxht]
+  }%
+}
+\next
+\hypersetup{%
+    pdfdisplaydoctitle=true,
+    pdftrapped=False,
+    pdfapart=2,
+    pdfaconformance=B,
+    pdfuapart=1,
+    pdfxstandard={PDF/X-4},
+}
+%%%%%%%%%% end PDF/A and PDF/X support
 \RequirePackage{amssymb}
 \RequirePackage{amsmath}
 \RequirePackage{etoolbox}