Re: [poppler] Question regarding font selection

Tue, 11 Jul 2017 10:41:44 -0700 

Hi,
After much debugging, I have found the problem with font selection. It seems to be related to fontconfig version 2.11.0. The root cause is the handling of the "spacing" parameter. 

$ fc-match -s "Courier" | head -5
n022003l.pfb: "Nimbus Mono L" "Regular"
Courier_New.ttf: "Courier New" "Normal"
Courier_New_Italic.ttf: "Courier New" "Cursiva"
LiberationMono-Regular.ttf: "Liberation Mono" "Regular"
DejaVuSansMono.ttf: "DejaVu Sans Mono" "Book"

$ fc-match -s "Courier:spacing=100" | head -5
n022024l.pfb: "Nimbus Mono L" "Bold Oblique"
n022003l.pfb: "Nimbus Mono L" "Regular"
Courier_New.ttf: "Courier New" "Normal"
Courier_New_Italic.ttf: "Courier New" "Cursiva"
LiberationMono-Regular.ttf: "Liberation Mono" "Regular"

$ fc-match -s "Courier:weight=80:spacing=100" | head -5
n022024l.pfb: "Nimbus Mono L" "Bold Oblique"
n022003l.pfb: "Nimbus Mono L" "Regular"
Courier_New.ttf: "Courier New" "Normal"
Courier_New_Italic.ttf: "Courier New" "Cursiva"
LiberationMono-Regular.ttf: "Liberation Mono" "Regular"



Problem #1 is that "Nimbus Mono L Bold Oblique" doesn't declare a 
"spacing" parameter; it seems its not even a real monospace font. 
Problem #2 is that fc-match goes bonkers when we ask for spacing but it 
doesn't find one; it wrongly orders the BoldOblique as the first font.  
Poppler always requests with a spacing, which triggers the bug.  That 
problem is fixed in fontconfig 2.11.93.



Even though Debian Stretch was released very recently, they only bundle 
fontconfig 2.11.0, so I have forced installed a newer version.


I hope this helps someone else, and thanks for the help.

Pierre-Luc


On 17-07-07 04:24 PM, Pierre-Luc Samuel wrote:

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On 17-07-06 07:39 AM, William Bader wrote:


> Interesting, I did not know about this command.  Here's the output I
get:
> Courier   7  0 Nimbus Mono L Bold
/usr/local/share/fonts/ghostscript/fonts/n022004l.pfb


If it shows /usr/local/share instead of /usr/share, it is coming from
a package that you installed rather than a package that came with the
distribution, and the problem could be customizations that you made to
your system rather than problems with poppler.

On Fedora 25, /usr/share/fonts/default/Type1/n022023l.pfb is provided
by urw-fonts

If it works for most people, the problem is probably something that
you did to your system, and the easiest way to track it down might be
getting the customized packages out of the path and then adding them
back one by one until you find the one that causes the problem.

You can use an strace command like the one below to see everything
that pdffonts touches

strace -e trace=open pdffonts file.pdf 2>&1 | less

Could you check that you have your distribution's fonts installed,
then temporarily rename /usr/local to get it off the path, and then
try pdffonts again?



OK I have rebuilt my image, now I have only a raw Debian Stretch with
packages fontconfig, poppler-utils, strace, less and gsfonts-x11 (which
seems to be the equivalent for urw-fonts). The situation is even worse
now because only the Bold Oblique font gets selected now.

Here's the output of strace:

$ strace -e trace=open pdffonts ./courier.pdf -subst 2>&1
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libpoppler.so.64", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libstdc++.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/liblcms2.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libtiff.so.5", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libjpeg.so.62", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libpng16.so.16", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libnss3.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libnssutil3.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libsmime3.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libssl3.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libplds4.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libplc4.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libnspr4.so", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libopenjp2.so.7", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libfontconfig.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libfreetype.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/liblzma.so.5", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libjbig.so.0", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/librt.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/lib/x86_64-linux-gnu/libexpat.so.1", O_RDONLY|O_CLOEXEC) = 3
open("/usr/share/poppler/nameToUnicode",
O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
open("/usr/share/poppler/nameToUnicode/Thai", O_RDONLY) = 4
open("/usr/share/poppler/nameToUnicode/Bulgarian", O_RDONLY) = 4
open("/usr/share/poppler/nameToUnicode/Greek", O_RDONLY) = 4
open("/usr/share/poppler/cidToUnicode",
O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
open("/usr/share/poppler/unicodeMap",
O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
open("/usr/share/poppler/cMap",
O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
open("./courier.pdf", O_RDONLY)         = 3
open("/etc/fonts/fonts.conf", O_RDONLY|O_CLOEXEC) = 4
open("/etc/fonts/conf.d", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 5

open("/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", 
O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/11-lcdfilter-default.conf", 
O_RDONLY|O_CLOEXEC) = 6

open("/etc/fonts/conf.d/20-unhint-small-dejavu-lgc-sans-mono.conf",
O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/20-unhint-small-dejavu-lgc-sans.conf",
O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/20-unhint-small-dejavu-lgc-serif.conf",
O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/20-unhint-small-dejavu-sans-mono.conf",
O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/20-unhint-small-dejavu-sans.conf",
O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/20-unhint-small-dejavu-serif.conf",
O_RDONLY|O_CLOEXEC) = 6

open("/etc/fonts/conf.d/20-unhint-small-vera.conf", 
O_RDONLY|O_CLOEXEC) = 6

open("/etc/fonts/conf.d/30-metric-aliases.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/30-urw-aliases.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/40-nonlatin.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/45-latin.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/49-sansserif.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/50-user.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/51-local.conf", O_RDONLY|O_CLOEXEC) = 6

open("/etc/fonts/conf.d/57-dejavu-sans-mono.conf", O_RDONLY|O_CLOEXEC) 
= 6

open("/etc/fonts/conf.d/57-dejavu-sans.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/57-dejavu-serif.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/58-dejavu-lgc-sans-mono.conf",
O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/58-dejavu-lgc-sans.conf", O_RDONLY|O_CLOEXEC) = 6

open("/etc/fonts/conf.d/58-dejavu-lgc-serif.conf", O_RDONLY|O_CLOEXEC) 
= 6

open("/etc/fonts/conf.d/60-latin.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/65-fonts-persian.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/65-nonlatin.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/69-unifont.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/70-no-bitmaps.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/80-delicious.conf", O_RDONLY|O_CLOEXEC) = 6
open("/etc/fonts/conf.d/90-synthetic.conf", O_RDONLY|O_CLOEXEC) = 6
open("/usr/share/fonts", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//3830d5c3ddfd5cd38a049b759396e72e-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/local/share/fonts", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//4c599c202bc5c08e2d34565a40eac3b2-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/X11", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//c855463f699352c367813e37f3f70ea7-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/cmap", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//57e423e26b20ab21d0f2f29c145174c3-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/truetype", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//7ef2298fde41cc6eeb7af42e48b7d293-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/type1", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//d82eb4fd963d448e2fcb7d7b793b5df3-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/X11/Type1", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//e13b20fdb08344e0e664864cc2ede53d-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/X11/encodings", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//707971e003b4ae6c8121c3a920e507f5-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/X11/util", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//fe547fea3a41b43a38975d292a2b19c7-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/cmap/adobe-cns1", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//f1f2465696798768e9653f19e17ccdc8-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/cmap/adobe-gb1", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//95530828ff6c81d309f8258d8d02a23e-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/cmap/adobe-japan1", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//d3e5c4ee2ceb1fc347f91d4cefc53bc0-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/cmap/adobe-japan2", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//e52a45a1c8c8fe895fc0fc8c4e6999b8-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/cmap/adobe-korea1", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//188ac73a183f12857f63bb60a4a6d603-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/truetype/dejavu", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//d589a48862398ed80a3d6066f4f56f4c-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/type1/gsfonts", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//945677eb7aeaf62f1d50efc3fb3ec7d8-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
open("/usr/share/fonts/X11/encodings/large", O_RDONLY|O_CLOEXEC) = 4

open("/var/cache/fontconfig//6333f38776742d18e214673cd2c24e34-le64.cache-4", 


O_RDONLY|O_CLOEXEC) = 4
name                                 object ID substitute
font                      substitute font file
------------------------------------ ---------
------------------------------------ ------------------------------------
Courier                                   7  0 Nimbus Mono L Bold
Oblique           /usr/share/fonts/X11/Type1/n022024l.pfb
Courier-Bold                              8  0 Nimbus Mono L Bold
Oblique           /usr/share/fonts/X11/Type1/n022024l.pfb
Courier-Oblique                           9  0 Nimbus Mono L Bold
Oblique           /usr/share/fonts/X11/Type1/n022024l.pfb
Courier-BoldOblique                      10  0 Nimbus Mono L Bold
Oblique           /usr/share/fonts/X11/Type1/n022024l.pfb






------------------------------------------------------------------------
*From:* poppler <[email protected]> on behalf of
Pierre-Luc Samuel <[email protected]>
*Sent:* Wednesday, July 5, 2017 3:47 PM
*To:* [email protected]
*Subject:* Re: [poppler] Question regarding font selection


On 17-07-05 01:10 PM, Jason Crain wrote:
> On Wed, Jul 05, 2017 at 10:45:07AM -0400, Pierre-Luc Samuel wrote:
>> On 17-07-04 06:43 PM, Albert Astals Cid wrote:
>>> El dimarts, 4 de juliol de 2017, a les 17:06:07 CEST, Pierre-Luc
Samuel va
>>> escriure:
>>>> I am experiencing weird font substitution with pdftocairo and was

>>>> wondering what was the algorithm to match fonts when converting 
from
>>>> PDF.  The Courier font (regular) is being substituted "Nimbus 
Mono L

>>>> Bold", even if fc-match return the non-bold version.
>>>>
>>>> $ fc-match "Courier"
>>>> n022003l.pfb: "Nimbus Mono L" "Regular"
>>>>
>>>> $ fc-match "Courier:style=bold"
>>>> n022004l.pfb: "Nimbus Mono L" "Bold"
>>>>
>>>> What could be the reason behind this?
>>> The pdf font can be asking for bold even if the name doesn't
contain bold.
>>>
>> Thanks for your answer Albert.  I have attached a sample PDF and
resulting
>> SVG with the problem I'm encountering.  I do not understand why the
bold
>> font is selected for the first "Courier".
>>
>> pdftocairo version 0.56.0
> It works for me:
>
> $ pdffonts ~/courier.pdf  -subst
> name                                 object ID substitute
font                      substitute font file
> ------------------------------------ ---------

------------------------------------ 
------------------------------------

> Courier                                   7  0 Nimbus Mono L
/usr/share/fonts/type1/gsfonts/n022003l.pfb
> Courier-Bold                              8  0 Nimbus Mono L Bold
/usr/share/fonts/type1/gsfonts/n022004l.pfb
> Courier-Oblique                           9  0 Nimbus Mono L Regular
Oblique /usr/share/fonts/type1/gsfonts/n022023l.pfb
> Courier-BoldOblique                      10  0 Nimbus Mono L Bold
Oblique /usr/share/fonts/type1/gsfonts/n022024l.pfb
>
> With versions 0.48.0 and from git master.

Interesting, I did not know about this command. Here's the output I get:


name                                 object ID substitute
font                      substitute font file
------------------------------------ ---------

------------------------------------ 
------------------------------------

Courier                                   7  0 Nimbus Mono L Bold
/usr/local/share/fonts/ghostscript/fonts/n022004l.pfb
Courier-Bold                              8  0 Nimbus Mono L Bold
/usr/local/share/fonts/ghostscript/fonts/n022004l.pfb
Courier-Oblique                           9  0 Nimbus Mono L Regular
Oblique /usr/local/share/fonts/ghostscript/fonts/n022023l.pfb
Courier-BoldOblique                      10  0 Nimbus Mono L Bold
Oblique /usr/local/share/fonts/ghostscript/fonts/n022024l.pfb

Pierre-Luc
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