%% This is file `novel-Images.sty', part of `novel' document class.
%% Copyright 2017-2023 Robert Allgeyer.
%%
%% This file may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, version 1.3c only.
%%   https://www.latex-project.org/lppl/lppl-1-3c/ 
%%
\ProvidesFile{novel-Images.sty}%
[2023/03/25 v1.81b LaTeX file (image placement)]
%%


%% In `novel', images are handled with a view to preserving uniform line grid.
%% Normally, a work of fiction has no (or very few) images within the main
%%   body of text. Images are more likely on display pages (such as title page)
%%   or in chapter starts, or maps.

%% There are two ways to place an image: inline, or float.
%% Inline image does not occupy its own block, but mingles with flowing text.
%% Float image occupies its own block, which will be placed where the command
%%   is written, if it fits on that page. If it doesn't fit, then it will be
%%   placed at the top of the following page. Surrounding text will be
%%   typeset so at to not leave a big gap. Althouth TeX allows several
%%   options for positioning a float, `novel' only allows one method.

%% Be sure to read the separate documentation about how to prepare images.
%% In general: (1) png or jpg only. (2) Flattened, no transparency.
%% (3) 300dpi (grayscale) or 600dpi (black/white) are industry norms.
%% (4) Image file must contain its resolution. (5) Exact size, without scaling.
%% (6) No private metadata. (7) Be sure grayscale is 1-channel, not rgb gray.


%% Luacode and related macro thanks to user Marcel Krüger,
%% at tex.stackexchange.com.
\RequirePackage{luacode}
\begin{luacode*}
  function check_colorspaces(allowed_colorspace, name)
  local doc = epdf.open(name);
  if doc == nil then
    tex.sprint(luatexbase.catcodetables['latex-package'],
        "\\errmessage{Could not open " .. name .. "}{}{}\\@gobbletwo")
    return;
  else
    for pageno=1,doc:getNumPages() do
      local xobjs= doc:getCatalog():getPage(pageno):getResourceDict():lookup("XObject");
      if not xobjs:isNull() then
        for i=1,xobjs:dictGetLength() do
          xobjDict = xobjs:dictGetVal(i):streamGetDict()
          if xobjDict:lookup('Subtype'):getName() == 'Image' then
            if not allowed_colorspace[xobjDict:lookup('ColorSpace'):getName()] then
              tex.sprint(luatexbase.catcodetables['latex-package'], '\\@firstoftwo')
              return
            end
          end
        end
      end
    end
  end
  tex.sprint(luatexbase.catcodetables['latex-package'], '\\@secondoftwo')
  return;
end
\end{luacode*}
%
\newcommand\PDFHasDisallowedColorspaceTF[1]{%
  \directlua{check_colorspaces({DeviceCMYK=true, DeviceGray=true},"\luaescapestring{#1}")}%
}
%%
%%
\begin{luacode*}
  function utf16to8(u16str)
    local result = ""
    local i = 1
    if #u16str % 2 == 1 then
      print("ERROR")
      return
    end
    while i < #u16str do
      local high, low = u16str:byte(i, i + 1)
      i = i + 2
      local current = bit32.replace(low, high, 8, 8)
      if bit32.band(high, 0xFC) == 0xD8 then
        current = bit32.replace(0, current, 10, 10)
        if i > #u16str then
          print("ERROR")
          return
        end
        high, low = u16str:byte(i, i + 1)
        i = i + 2
        current = bit32.replace(current, bit32.replace(low, high, 8, 8), 0, 10) + 0x10000
      elseif bit32.band(high, 0xFC) == 0xDC then
        print("ERROR")
        return
      end
      result = result .. unicode.utf8.char(current)
    end
    return result
  end
  function normalize_string(str)
    if str:sub(1,2) == "\xFE\xFF" then
      return utf16to8(str:sub(3,-3))
    else
      return str
    end
  end
  function check_pdf_info(name, field, expected)
    local doc = epdf.open(name);
    if doc == nil then
      tex.sprint(luatexbase.catcodetables['latex-package'],
          "\\errmessage{Could not open " .. name .. "}{}{}\\@gobbletwo")
    else
      local producer = doc:getDocInfo():dictLookup(field)
      if not producer:isNull() and normalize_string(producer:getString()) == expected then
        tex.sprint(luatexbase.catcodetables['latex-package'], '\\@firstoftwo')
      else
        tex.sprint(luatexbase.catcodetables['latex-package'], '\\@secondoftwo')
      end
    end
  end
\end{luacode*}
\newcommand\PDFVerifyInfoFieldTF[3]{\directlua{check_pdf_info("\luaescapestring{#1}", "\luaescapestring{#2}", "\luaescapestring{#3}")}}
%%


%%
\LetLtxMacro\@scriptincludepdf\includepdf\relax
\providecommand\includepdf[2][]{}
\renewcommand\includepdf[2][]{% from package `pdfpages'
  \ClassError{novel}{Cannot use \string\includepdf\space command}%
   {You can use novel-scripts `makegray' and `makebw' to convert pdf %%J%
    to a raster jpg or png, suitable for placement as an image.}%
}
\gdef\ScriptCoverImage#1{%
  \if@coverart%
    \PDFVerifyInfoFieldTF{#1}{NSprocessed}{true}%
    {\@scriptincludepdf{#1}}%
    {\ClassError{novel}{Book cover pdf must be pre-processed by novel-scripts}%
     {Each pdf processed by novel-scripts is marked internally. ^^J%
     Your cover artwork pdf is unmarked. Use `makecmykpdf' script.}%
    }%
  \else%
    \ClassError{novel}{Cannot use \string\ScriptCoverImage\space in interior}%
     {\string\ScriptCoverImage\space only with `coverart' class option.}%
  \fi%
} %
%%


% Pertains to images:
\newlength\imagewidth
\newlength\imageheight
\newlength\imagehoffset
\newlength\imagevoffset
\newlength\@imagewidth
\newlength\@imageheight
\newlength\@imagehoffset
\newlength\@imagevoffset
\newlength\@mytotalht
\newif \if@UsingNovelCommand % true within \InlineImage etc.
%%
\gdef\imagestarred{false}
\gdef\imagefilename{unknown}
\setkeys{Gin}{draft=false} % always shows the image, not a box outline
\LetLtxMacro\novel@sub@inclgr\includegraphics\relax
\if@coverart\else % Need to allow it, for possible use by \includepdf in cover.
  \renewcommand\includegraphics[2][]{%
    \ClassError{novel}{Direct use of \string\includegraphics\space forbidden}%
     {You may only place images using commands specific to `novel' class. ^^J%
      See `novel' documentation, section 7.}%
  }
\fi
%
\newcommand\@TestImageExtension[1]{%
  \@tempTFfalse%
  \IfEndWith{#1}{.png}{\@tempTFtrue}{}%
  \IfEndWith{#1}{.PNG}{\@tempTFtrue}{}%
  \IfEndWith{#1}{.jpg}{\@tempTFtrue}{}%
  \IfEndWith{#1}{.JPG}{\@tempTFtrue}{}%
  \IfEndWith{#1}{.jpeg}{\@tempTFtrue}{}%
  \IfEndWith{#1}{.JPEG}{\@tempTFtrue}{}%
  \if@tempTF\else%
    \ClassError{novel}{Image format `#1' not allowed, page \thepage}%
    {Image `#1' has file type not allowed in `novel' class. ^^J%
     Must have file extension png, jpg, jpeg (or capitalized). ^^J%
     Others such as pdf, bmp, tiff, eps, svg, jp2, jbig, are not allowed. ^^J%
     The file extension is mandatory. Provide it, if missing.}%
  \fi%
} %
%%


%% INLINE IMAGE
%% ----------------------------------------------------------------------------
% \InlineImage[xoffset,yoffset]{imagename.png} or jpg
% As the name implies, an inline image is used within the flow of text, rather
%   than in its own block. It may be used in main body, header, and footer.
% Macros such as \imagefilename, \imagewidth, etc.
%   are only set or re-set when the image in in the body. That prevents an
%   intervening header/footer image from over-writing values set by%
%   the most recent body image.
% Without offsets, the image is positioned with is left edge at the cursor,
%   and its top edge at the text baseline. Positive offsets are right and up.
% If improperly positioned, the image can overlie (obscure) text that was
%   previously placed. This is rarely desirable and may be flagged by
%   some print services, because it looks wrong.
% The image will underlie anything that follows. This may be used as a
%   special effect, if allowed by the print service (probably OK).
% With the un-starred command, the image occupies its natural cursor width.
% With the starred command, the image occupies zero cursor width, so that
%   anything following will overlie it.
\DeclareDocumentCommand \InlineImage { s O{0pt} m }{%
  \@TestImageExtension{#3}%
  \@tempTFfalse%
  \if@pdfxSEToff%
    \@tempTFtrue%
  \else%
    \IfSubStr*{\@UnknownImages}{#3}{\@tempTFtrue}{}%
    \IfSubStr*{\@AllGoodImages}{#3}{\@tempTFtrue}{}%
  \fi%
  \if@tempTF\else\@NovelInspectImage{#3}\fi%
  \StrDel{#2}{\space}[\@myila]%
  \StrCut{\@myila}{,}{\@myilxa}{\@myilya}%
  \ifthenelse{\equal{\@myilxa}{} \OR \equal{\@myilxa}{0}}{%
    \def\@myilx{0pt}}{\def\@myilx{\@myilxa}%
  }%
  \ifthenelse{\equal{\@myilya}{} \OR \equal{\@myilya}{0}}{%
    \def\@myily{0pt}}{\def\@myily{\@myilya}%
  }%
  \iftoggle{@inheadfoot}{}{\gdef\imagefilename{#3}}% for possible later use
  \global\@UsingNovelCommandtrue%
  \gdef\@mygraphic{\novel@sub@inclgr{#3}}%
  \gdef\@mygraphicname{#3}%
  \setlength\@imagewidth{\widthof{\@mygraphic}}%
  \global\@imagewidth=\@imagewidth%
  \iftoggle{@inheadfoot}{}{\setlength\imagewidth{\@imagewidth}}%
  \setlength\@imageheight{\heightof{\@mygraphic}}%
  \global\@imageheight=\@imageheight%
  \iftoggle{@inheadfoot}{}{%
    \setlength\imageheight{\@imageheight}%
    \global\imageheight=\imageheight%
  }%
  %
  \setlength\@imagehoffset{\@myilx}%
  \IfBeginWith{\@myily}{b}{%
    \StrDel[1]{\@myily}{b}[\temp@adjVoffseta]%
    \ifthenelse{\equal{\temp@adjVoffseta}{} \OR \equal{\temp@adjVoffseta}{0}}{%
      \def\temp@adjVoffset{0pt}}{\def\temp@adjVoffset{\temp@adjVoffseta}%
    }%
    \setlength\@imagevoffset{\temp@adjVoffset}%
  }{%
    \setlength\@imagevoffset{-\@imageheight}%
    \addtolength\@imagevoffset{\@myily}%
  }%
  %
  \IfBooleanTF{#1}%
  % starred:
  {%
    \iftoggle{@inheadfoot}{}{\gdef\imagestarred{true}}%
    \makebox[0pt][l]{%
      \hspace{\@imagehoffset}%
      \stake\smash{\raisebox{\@imagevoffset}{\@mygraphic}}%
    }%
  }%
  % unstarred:
  {%
    \iftoggle{@inheadfoot}{}{\gdef\imagestarred{false}}%
    \hspace{\@imagehoffset}%
    \stake\smash{\raisebox{\@imagevoffset}{\@mygraphic}}%
  }% end IfBooleanTF{#1}
  \iftoggle{@inheadfoot}{}{\setlength\imagehoffset{\@imagehoffset}}%
  \iftoggle{@inheadfoot}{}{\setlength\imagevoffset{\@imagevoffset}}%
  \global\@UsingNovelCommandfalse%
} % 
% end Inline Image
%%


%% FLOAT IMAGE (centered unless offset)
%% ----------------------------------------------------------------------------
% \FloatImage[floatmethod,xoffset,yoffset]{yourimagename.png} % or jpg
% This is a substitute for other floats. Does not require `float' package.
% Default: [ht,0pt,\nfs].
% Method ht attempts to place the image where the code is written. But if it
%   doesn't fit on that page, it will float to the top of the next page.
% Method b attempts to place the image on the bottom of the page where the
%   code is written. If not, it floats to the bottom of the next page.
% Allowed float methods: ht hb t b. Equivalent to LaTeX floats with !.
% Parsing the optional argument: comma-separated values, ignoring space.
%   May be empty before or between commas.
%   Example: [,,2em] is read as default method, xoffset 0pt, yoffset 2em.
%   Example: [b] is valid, because a single value is read as method.
\providecommand*\floatlocation[2]{\@namedef{fps@#1}{#2}}
\floatlocation{figure}{!ht} % default
\gdef\ftype@figure{1} % mystery TeX code
\DeclareDocumentCommand \FloatImage { s O{ht} m } {% starred not in use
  \iftoggle{@inheadfoot}{%
    \ClassError{novel}{Cannot use \string\FloatImage\space in header/footer}%
      {Header footer allow \string\InlineImage, but not \string\FloatImage.}%
  }{}%
  \@TestImageExtension{#3}%
  \@tempTFfalse%
  \if@pdfxSEToff%
    \@tempTFtrue%
  \else%
    \IfSubStr*{\@UnknownImages}{#3}{\@tempTFtrue}{}%
    \IfSubStr*{\@AllGoodImages}{#3}{\@tempTFtrue}{}%
  \fi%
  \if@tempTF\else\@NovelInspectImage{#3}\fi%
  % Sadly, parsing with `xstring' involves roundabout code:
  \StrDel{#2}{\space}[\@tempArgs]%
  \StrCut{\@tempArgs}{,}{\@tempArgA}{\@tempArgX}%
  \StrCut{\@tempArgX}{,}{\@tempArgB}{\@tempArgC}%
  \ifthenelse{\equal{\@tempArgA}{}}{%
    \def\@tempArgAa{ht}%
  }{%
    \def\@tempArgAa{\@tempArgA}%
  }%
  \ifthenelse{\equal{\@tempArgB}{0}\OR\equal{\@tempArgB}{}}{%
    \def\@tempArgBb{0pt}%
  }{%
    \def\@tempArgBb{\@tempArgB}%
  }%
  \ifthenelse{\equal{\@tempArgC}{0}\OR\equal{\@tempArgC}{}}{%
    \def\@tempArgCc{0pt}%
  }{%
    \def\@tempArgCc{\@tempArgC}%
  }%
  \StrDel{\@tempArgAa}{!}[\@tempArgAa]%
  \@tempTFfalse%
  \ifthenelse{\equal{\@tempArgAa}{ht}}{\@tempTFtrue}{}%
  \ifthenelse{\equal{\@tempArgAa}{hb}}{\@tempTFtrue}{}%
  \ifthenelse{\equal{\@tempArgAa}{t}}{\@tempTFtrue}{}%
  \ifthenelse{\equal{\@tempArgAa}{b}}{\@tempTFtrue}{}%
  \if@tempTF\else%
    \ClassWarning{novel}{Incorrect position for \string\FloatImage, ^^J%
     page \thepage. Default position ht substituted.}%
  \fi%
  \floatlocation{figure}{!\@tempArgAa}% enable current float method
  %\vfil% One l.
  \@float{figure}%
  \@FloatImage{\@tempArgBb}{\@tempArgCc}{#3}%
  \end@float\par%
  \floatlocation{figure}{!ht}% restore default float method
  \null%
  \vspace{0.01pt plus 0pt minus 0.02pt} % caulk
} %
%

%% Environment @floatimagegap. Only used by \@FloatImage command.
% Creates a gap at fixed height, regardless of content.
% Needs to compensate for prior line depth.
\newcounter{@gaplines} % passes the argument down to environment end
\DeclareDocumentEnvironment {@floatimagegap} { m } {%
  \par%
  \null%
  \vspace*{-\nbs}%
  \begin{textblock*}{\textwidth}[0,0](0pt,0pt)%
  \setcounter{@gaplines}{#1}%
  \strut\par%
  \vspace*{-\nbs}%
}{% close the environment:
  \end{textblock*}%
  \par%
  \vspace*{#1\nbs}%
} %
%%
\DeclareDocumentCommand \@FloatImage { m m m }{% DO NOT CALL DIRECTLY
  \global\@UsingNovelCommandtrue%
  \gdef\@mygraphic{\novel@sub@inclgr{#3}}%
  \gdef\@mygraphicname{#3}%
  \gsetlength\@imagewidth{\widthof{\@mygraphic}}%
  \gsetlength\@imageheight{\heightof{\@mygraphic}}%
  \setlength\@imagehoffset{#1}%
  \setlength\@imagevoffset{#2-\@imageheight+\normalXheight}%
  \setlength\@mytotalht{\@imageheight+0.3\nbs}%
  \FPdiv{\@mytotalhtN}{\strip@pt\@mytotalht}{\strip@pt\nbs}%
  \FPadd{\@mytotalhtN}{\@mytotalhtN}{0.5}% round upward
  \FPround{\@mytotalhtN}{\@mytotalhtN}{0}% to integer
  \FPmin{\@allowmyoverflow}{\@mytotalhtN}{\@LinesPerPage}% not exceeding lpp
  % If a full-page image is too tall for a page, standard TeX float will
  %   delay it until the time that floats are cleared, typically by \clearpage.
  %   That would probably be at the end of a chapter.
  % In `novel' this behavior is hacked. Regardless of the image's actual
  %   height, it is treated as if its height does not exceed whatever will
  %   fit on a single page. Then, a full-page float will appear at the first
  %   opportunity, rather than being delayed. As a consquence, an oversized
  %   full-page float may overflow into the footer or bottom margin.
  %   To fix that (if it matters), you need to edit the image in graphics.
  \begin{@floatimagegap}{\@allowmyoverflow}%
    \vspace*{-\nfs}%
    \null%
    {\centering%
      \makebox[0pt][l]{%
        \hspace{\dimexpr\@imagehoffset-0.5\@imagewidth}%
        \stake\smash{\raisebox{\@imagevoffset}{\@mygraphic}}%
      }%
      \par%
    }%
  \end{@floatimagegap}%
  \global\@UsingNovelCommandfalse%
} % 
% end Float Image
%%


%% WRAP IMAGE
% This is a shim to `wrapfig' package. Since `novel' uses its own method for
%   placing images, environments defined in `wrapfig' cannot be used directly.
% \WrapImage[position]{image} % default position r
%   Optional position is same as with `wrapfig':
%   l r o i places image "exactly here", left, right, outside, inside.
%   L R O I allows image to float.
% Since novel's \InlineImage normally can be over-written by following text,
%   it needs an accompanying \rule to act as a strut.
%
\RequirePackage{wrapfig}
%
\DeclareDocumentCommand\WrapImage { O{r} m } {%
  \begin{wrapfloat}{figure}{#1}{0pt}%
  \InlineImage[0pt,\normalXheight]{#2}%
  \rule[\dimexpr\normalXheight-\imageheight]{0pt}%
    {\dimexpr\imageheight-\normalXheight+0.3\nfs}%
  \end{wrapfloat}%
}%
\LetLtxMacro\wrapimage\WrapImage\relax
% end Wrap Image.
%%


%% Read file bytes as plain text, for later parsing.
% Output is comma-separated list of byte codes, decimal 0-255.
% Returns -1 if requested start is more than file size.
% Returns all bytes if requested number exceeds file size.
% Does not test if file exists; error if not found.
\DeclareDocumentCommand\novelgetbytes { m m m } {%
  % filename, start byte number (0=beginning, e=up to end), number of bytes
  \ifthenelse{\equal{#2}{e}}{% package xifthen
    \long\edef\novelbytesare{%
      \directlua{
        inp = assert(io.open("#1", "rb"))
        local e=inp:seek("end")
        if #3>e+1 then
          inp:seek("set")
          local r=inp:read(e)
          sep=""
          for i,_ in string.bytes(r)
          do
          tex.sprint(sep)
          sep=","
          tex.sprint(i)
          end
        else
          local b=e-2-math.min(e,#3)
          local w=1+math.min(e,#3)
          inp:seek("set",b)
          local r=inp:read(w)
          sep=""
          for i,_ in string.bytes(r)
          do
          tex.sprint(sep)
          sep=","
          tex.sprint(i)
          end
        end
      }%
    }%
  }{%
    \long\edef\novelbytesare{%
      \directlua{
        inp = assert(io.open("#1", "rb"))
        local e=inp:seek("end")
        if #2>e then tex.sprint(-1) else
          local w=math.min(#3,e-#2)
          inp:seek("set",#2)
          local r=inp:read(w)
          sep=""
          for i,_ in string.bytes(r)
          do
          tex.sprint(sep)
          sep=","
          tex.sprint(i)
          end
        end
      }%
    }%
  }%
} % end @novelgetbytes

%%
% png bit depth is 8 for ordinary color or gray, 1 for b/w monochrome.
% Although png allows more than 8, `novel' does not.
\def\novelpngbitdepth#1{\novelgetbytes{#1}{24}{1}\novelbytesare}
% png color type: 0=grayscale (incl. b/w).
% `novel' only permits colortype 0 for non-color book interiors.
% other: 2=rgb, 3=indexed rgb, 4=gray alpha, 6=rgb alpha.
\def\novelpngcolortype#1{\novelgetbytes{#1}{25}{1}\novelbytesare}
%%

%%
% Examine png or jpg image for novel-make as comment:
% Known-good images, will not be inspected. Comma-separated list:
\newcommand\SetKnownGoodImages[1]{
  \gdef\@KnownGoodImages{#1}
}
\SetKnownGoodImages{} % default empty
\gdef\@AllGoodImages{}
\gdef\@UnknownImages{}
%
\gdef\@GatherGoodImages{% called \AtBeginDocument by `novel.cls'.
  \let\SetKnownGoodImages\relax
  \xdef\@AllGoodImages{\@KnownGoodImages\space \@AllGoodImages}
  \if@pdfxSEToff
    \xdef\@AllGoodImages{\@KnownGoodImages}
    \xdef\@UnknownImages{}
  \fi
}
% This is the (decimal) code string:
\gdef\@novelmake{110,111,118,101,108,109,97,107,101}
%
\newcommand\@NovelInspectImage[1]{%
  \StrRight{#1}{3}[\tempEXT]%
  \ifthenelse{\equal{\tempEXT}{png} \OR \equal{\tempEXT}{PNG}}{%
    \novelgetbytes{#1}{e}{256}%
  }{% jpg or JPG:
    \novelgetbytes{#1}{0}{256}%
  }%
  \IfSubStr{\novelbytesare}{\@novelmake}{%
    \xdef\@AllGoodImages{\@AllGoodImages\space #1}%
  }{%
    \xdef\@UnknownImages{\@UnknownImages\space #1}%
  }%
}
%%


%% Called \AfterEndDocument by `novel.cls`:
\long\gdef\@WarnUnknownImages{%
  \@tempTFfalse%
  \ifthenelse{\equal{\@UnknownImages}{}}{}{\@tempTFtrue}%
  \if@pdfxSEToff\@tempTFfalse\fi%
  \if@tempTF%
      \typeout{^^JClass `novel' Alert: Some images not processed by scripts.^^J%
       \space List of unprocessed images: \@UnknownImages ^^J%
       \space Above list does not include any `known good' set by you. ^^J^^J}%
      \ClassWarning{novel}{\@testintentional %
      Some images may not meet PDF/X specifications. ^^J%
      See near end of log file for `Some images not processed by scripts`. ^^J}%
  \fi%
}
%%



%%
\endinput
%%
%% End of file `novel-Images.sty'.