On 2016-04-11 02:17, Dmitry Boyarintsev wrote: > I always assumed it represents text as a sequence of glyphs, rather than > sequence of characters. But it seems like both options are possible.
No, your first assumption is correct. When it comes to PDF, there is NO notion of text strings (sequence of characters). PDF only understands graphical elements (lines, rectangles, curves etc). The PDF creator breaks text down into character ID's (something like Unicode codepoints - but again PDF's know nothing about Unicode either). Those character ID's are used to look up Glyph ID's in the font file. The Glyph ID's are what are stored inside the PDF. When viewed, those glyph ID's are used to retrieve the vector graphic instructions from the font file to render a glyph. You might view a PDF with a text editor and see text strings. It might look like text strings to you (eg: ASCII range), but PDF doesn't consider them text, but rather ID's. It is pure coincidence that they happen to look like text in a text editor. Regards, - Graeme - -- fpGUI Toolkit - a cross-platform GUI toolkit using Free Pascal http://fpgui.sourceforge.net/ My public PGP key: http://tinyurl.com/graeme-pgp -- _______________________________________________ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
