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bug#36427: docview wrong spacing

From: Tassilo Horn
Subject: bug#36427: docview wrong spacing
Date: Sun, 07 Jul 2019 09:53:59 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

積丹尼 Dan Jacobson <address@hidden> writes:

Hi Dan,

> Something's wrong with docview.
> Install libpdf-api2-perl debian package.
> Run this perl script,
> use PDF::API2;
> $pdf = PDF::API2->new();
> $page = $pdf->page();
> $page->mediabox('Letter');
> $text = $page->text();
> $font = $pdf->cjkfont('traditional'); #something the matter when I use that
> $text->font( $font, 20 );
> $text->translate( 200, 700 );
> $text->text(join "", 'A'..'Z');
> $pdf->saveas('new.pdf');
> Then do v (runs the command dired-view-file) on new.pdf.
> See the bad spacing e.g., around the I?
> Looks fine in Firefox and chromium.

That's what it looks like on my (Arch GNU/Linux) machine:

PNG image

So for me, the space after J and T seem to be a bit larger than after
the other letters.  However, when viewed with Evince (the GNOME document
viewer), it looks exactly the same, see:

PNG image

I think what you describe is some font rendering issue with GhostScript
or mupdf (whatever doc-view uses on your machine to produce images from
the PDF), e.g., some suitable font, and there's nothing doc-view itself
could do here.

I'm closing this issue.


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