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Hello Pali, and Paul
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<div class="">On Jun 26, 2016, at 7:21 AM, Pali Rohár <<a href="mailto:pali.rohar@gmail.com" class="">pali.rohar@gmail.com</a>> wrote:</div>
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<blockquote type="cite" class="">Maybe PDF readers could think that font is not in Latin1, but in<br class="">
Unicode as IIRC Unicode at positions 128-255 have same characters<br class="">
as Latin1 encoding.<br class="">
<br class="">
Unicode character U+00E8 is for sure 'è'. So I bet this is reason<br class="">
why PDF reader thinks that I selected character 'è' and not 'č'.<br class="">
<br class="">
For Type 1 PFB fonts (even in IL2 encoding) this is not a problem,<br class="">
because for each characters there is stored unified glyph name and<br class="">
there is standard conversion table from glyph name to unicode<br class="">
character.<br class="">
<br class="">
So probably in PK fonts is not any conversion table from 8bit<br class="">
character to unicode character and so something (pdftex? PDF<br class="">
reader?) assume either Latin1 or Unicode.<br class="">
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<div>What you need is a CMAP resource, which gets associated</div>
<div>with the Font-Descriptor dictionary, not with the font itself.</div>
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<div>This is what is done with PFA and PFB fonts, and others.</div>
<div>So I don’t see why you cannot also do this with PK fonts.</div>
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<div>The question then becomes “who or what creates the CMAP?”.</div>
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<div>pdfTeX has a primitive \pdfgentounicode which if set to 1 (or higher)</div>
<div>causes an attempt to create the CMAP internally, based upon glyph names</div>
<div>and using a standard list of font character names.</div>
<div>Extra info can be provided by the \pdfglyphtounicode primitive,</div>
<div>as you have encountered in an earlier posting.</div>
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<div>But Metafont-produced pk-fonts tend to use lazy generic names for</div>
<div>characters, such as /a1, /a2, /a3, etc.</div>
<div>This can imply non-uniqueness across several fonts, so is likely to be</div>
<div>unsuitable if you need to provide CMAP resources for several fonts</div>
<div>using the same character names.</div>
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</div>
<div>The alternative is to construct the full CMAP resource externally,</div>
<div>as a text file. Then the contents of this file is loaded into the PDF</div>
<div>using pdfTeX’s \pdffontattr primitive, which reads in the file as a stream,</div>
<div>and creates the correct dictionary entry.</div>
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<div>For details on how this can be done in TeX coding, consult the package</div>
<div> cmap.sty .</div>
<div>Look at files such as ot1.cmap, t1.cmap, t2.cmap etc. for the structure</div>
<div>of the kind of data file that is needed. These encode the unicode</div>
<div>mapping of the numbered character slots in a font.</div>
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<div>Also it may be helpful to examine the coding that I’ve included below,</div>
<div>for attaching a CMAP resource to Xy-pic directional fonts,</div>
<div>e.g., for arrow-heads.</div>
<div>This assumes that LaTeX can find a private file called: xyd.cmap .</div>
<div>Another primitive \pdfnobuiltintounicode disables the attempt to create</div>
<div>the CMAP internally.</div>
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<div class="">
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Yes, I agree that this is likely the case. I do know that in PK<br class="">
fonts, there is only a character (or no character) for each of the<br class="">
positions 0-255, with no character names or additional coding<br class="">
information.<br class="">
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When specifying Type 1 PFB font, it needed to add it into pdftex font <br class="">
map file (primitive \pdfmapfile). And map line allows to specify <br class="">
encoding vector file. That file contains for each character 0-255 <br class="">
position glyph name. And pdftex primitive \pdfglyphtounicode then maps <br class="">
glyph name to unicode character. So For PFB fonts it is possible to do <br class="">
that 0-255 position to unicode mapping.<br class="">
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As outlined above.</div>
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<div class="">But it is pity that it is not possible to specify that enc file also for
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PK fonts generated by MetaFont. Or it is somehow possible?<br class="">
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<div>I see no reason why not, but could easily be wrong.</div>
<div>But I must admit that I’ve not tried it with a PK font.</div>
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<div>Font outlines have been the preferred technology for ~20 years</div>
<div>or more, so I’ve not had the need with bit-mapped fonts.</div>
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<blockquote type="cite" class="">In detail my question is: How to tell pdftex encoding of PK font<br class="">
(generated from MetaFont)?<br class="">
<br class="">
<blockquote type="cite" class="">For information on virtual fonts: use Google.<br class="">
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With above detailed description, are you sure that virtual fonts<br class="">
could do this unicode mapping?<br class="">
<br class="">
Are not virtual fonts again only 8bit (as opposite of glyph names<br class="">
and unicode)?<br class="">
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Yes, virtual fonts are only 8 bits. There are things called "omega<br class="">
virtual fonts" which I think allow for larger-numbered characters,<br class="">
but I don't know whether pdftex supports them. I think that luatex<br class="">
does.<br class="">
</blockquote>
<br class="">
Luatex is unicoded and it is possible to create virtual font which remap <br class="">
latin2 to unicode (yesterday I tried that). But my question is about <br class="">
pdftex right now.<br class="">
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<div>Try what I suggest above.</div>
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<div>% Supply CMAP files for Xy-pic's arrowhead fonts</div>
<div>% otherwise an Accessibility check fails for encoding of arrow tips.</div>
<div>%</div>
<div>\def\TPDF@xyd@encoding{xyd}</div>
<div>\def\TPDF@support@xyarrows{%</div>
<div> \IfFileExists{\TPDF@<a href="mailto:xyd@encoding.cmap" class="">xyd@encoding.cmap</a>}%</div>
<div> {\TPDF@load@xyd}%</div>
<div> {\TPDF@inhibitload@xyd}%</div>
<div>}</div>
<div> </div>
<div>\def\TPDF@load@xyd{%</div>
<div> \immediate\pdfobj stream file {\TPDF@<a href="mailto:xyd@encoding.cmap" class="">xyd@encoding.cmap</a>}\relax</div>
<div> \xdef\TPDF@set@cmap@xyd##1{%</div>
<div> \noexpand\expandafter\pdffontattr\noexpand##1 {/ToUnicode \the\pdflastobj\space 0 R}}%</div>
<div> }</div>
<div>\def\TPDF@inhibitload@xyd{\gdef\TPDF@set@cmap@xyd##1{}}</div>
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<div>% standard Xy tips</div>
<div>\def\TPDF@xyd@cmap@xy{%</div>
<div> \pdfnobuiltintounicode\xyatipfont</div>
<div> \TPDF@set@cmap@xyd{\xyatipfont}%</div>
<div> \pdfnobuiltintounicode\xybtipfont</div>
<div> \TPDF@set@cmap@xyd{\xybtipfont}%</div>
<div>}</div>
<div>% CM-style Xy tips</div>
<div>\def\TPDF@xyd@cmap@cm{%</div>
<div> \pdfnobuiltintounicode\xy@@atfont</div>
<div> \TPDF@set@cmap@xyd{\xy@@atfont}%</div>
<div> \pdfnobuiltintounicode\xy@@btfont</div>
<div> \TPDF@set@cmap@xyd{\xy@@btfont}%</div>
<div>}</div>
<div>% rebind the \UseTips macro</div>
<div>\def\TPDF@UseTips{%</div>
<div> \LTX@UseTips</div>
<div> \TPDF@xyd@cmap@cm</div>
<div>}</div>
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</div>
<div>\AtBeginDocument{%</div>
<div> \@ifpackageloaded{xy}{% activate CMaps for Xy-pic arrows</div>
<div> \TPDF@support@xyarrows</div>
<div> \TPDF@xyd@cmap@xy</div>
<div> \let\LTX@UseTips\UseTips</div>
<div> \let\UseTips\TPDF@UseTips</div>
<div> }{}%</div>
<div> }</div>
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<blockquote type="cite" class="">
<div class=""><br class="">
-- <br class="">
Pali Rohár<br class="">
<a href="mailto:pali.rohar@gmail.com" class="">pali.rohar@gmail.com</a><br class="">
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Hope this helps,</div>
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</div>
<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Ross</div>
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