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Hi all,
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<div class="">I was writing this before Karl’s message arrived.</div>
<div class="">But I’ll send it anyway.<br class="">
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<blockquote type="cite" class="">
<div class="">On Jul 16, 2016, at 8:57 PM, Norbert Preining <<a href="mailto:preining@logic.at" class="">preining@logic.at</a>> wrote:</div>
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<div class="">Hi all<br class="">
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<br class="">
<blockquote type="cite" class=""> fd = epdf_create_fontdescriptor(fontmap, round(stemV->getNum()));<br class="">
</blockquote>
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Sounds excellent.<br class="">
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What about the other values? As far I understood Ross's email, many of the other values can be real, too.<br class="">
<br class="">
Norbert<br class="">
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<div class="">With all due respect, why do anything that changes the number </div>
<div class="">that has been read from a font file?</div>
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<div class="">Surely all (modulo a case discussed below) pdfTeX does with stemV is to build</div>
<div class="">the font-descriptor dictionary, which is written into the PDF file as a string.</div>
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<div class="">So by all means read the stemV value from a font file as a number (integer or float)</div>
<div class="">but then immediately convert it into its string representation, which is how it should </div>
<div class="">be written out again, preserving the accuracy that was originally supplied.</div>
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<div class="">The problem case is surely when there is no stemV supplied in the font,</div>
<div class="">as with TTF fonts, but it must be included in the font-descriptor to get valid PDF. </div>
<div class="">See the following conversation:</div>
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</div>
<div class=""> <a href="https://stackoverflow.com/questions/35485179/stemv-value-of-the-truetype-font" class="">https://stackoverflow.com/questions/35485179/stemv-value-of-the-truetype-font</a></div>
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<div class="">If no stemV value is supplied, then one must be created;</div>
<div class="">e.g. estimate it using the width of a non-serifed `I’ in the font family.</div>
<div class="">If the font is italiced, multiply by cosine of the italic-angle.</div>
<div class="">Or produce some other approximate heuristic, as a truly exact value is rarely required.</div>
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<div class="">Something of this kind is going on here, isn’t it?</div>
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<div class="">
<div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">writefont.c- fd->font_dim[DESCENT_CODE].val = i < 0 ? i : 0;</div>
<div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">writefont.c: fd->font_dim[STEMV_CODE].val =</div>
<div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">writefont.c- dividescaled(getcharwidth(f, '.') / 3, pdffontsize[f], 3);</div>
<div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">writefont.c- fd->font_dim[XHEIGHT_CODE].val =</div>
<div style="margin: 0px; font-size: 11px; font-family: Menlo;" class="">writefont.c- dividescaled(getxheight(f), pdffontsize[f], 3);</div>
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<div class="">but the result is an integer. </div>
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<div class="">If such a calculation were to produce a float, then approximate/truncate it in some fashion</div>
<div class="">and convert to a string for inclusion in the font-descriptor.</div>
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<div class="">It is clear from the following link that other software treats stemV as non-integer:</div>
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<div class=""><a href="https://documentation.devexpress.com/#CoreLibraries/DevExpressPdfPdfFontDescriptor_StemVtopic" class="">https://documentation.devexpress.com/#CoreLibraries/DevExpressPdfPdfFontDescriptor_StemVtopic</a></div>
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<div class="">Indeed here it is declared as a double !!</div>
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<div class="">Hope this help,</div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Ross</div>
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