Databases
StackOverflow2013
Postsdbo
POPDF font mapping error
Body
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPDF font mapping error
    text
    copied!<p>While rendering a PDF file generated by PDFCreator 0.9.x. I noticed it contains an error in the character mapping. Now, an error in a PDF file is nothing to be wondered about, Acrobat does wonders in rendering faulty PDF files hence a lot of PDF generators create PDFs that do not adhere fully to the PDF standard.</p> <p>I trief to create a small example file: <a href="http://test.continuit.nl/temp/Document.pdf" rel="nofollow">http://test.continuit.nl/temp/Document.pdf</a></p> <p>The single page renders a single glyph (a capital A) using a Tj command (See stream 5 0 obj). The font selected (7 0 obj) contains a font with a single glyph embedded. So far so good. The char is referenced by char #1. Given the Encoding of the font it contains a Differences part: [ 1 /A ]. Thus char 1 -> character /A. Now in the embedded subset font there is a cmap that matches no glyph at character 65 (eg capital A) the cmap section of the font does define the character in exactly the order in the PDF file Font -> Encoding -> Differences array.</p> <p>It looks like the character mapping / encoding is done twice. Only Files from PDFCreator 0.9.x seem to be affected.</p> <p>My question is: Is this correct (or did I make a mistake and is the PDF correct) and what would you do to detect this situation in order to solve the rendering problem.</p> <p>Note: I do need to be able to render these PDFs..</p> <p><em>Solution</em></p> <p>In the ISO32000 file there is a remark that symbolic TrueType fonts (flag bit 3 is on in the font descriptor) the encoding is not allowed and you should IGNORE it, using a simple 1on1 encoding always. SO all in all, if it is a symbolic font, I ignore the Encoding object altogether and this solves the problem.</p>
 

Querying!

 
Guidance
An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload