For every page in a given PDF file it's possible to list the fonts used:
$ pdffonts -f 10 -l 10 file.pdf
name type encoding emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
[none] Type 3 Custom yes no no 12 0
DIIDPF+ArialMT CID TrueType Identity-H yes yes yes 95 0
DIIEDH+Arial CID TrueType Identity-H yes yes no 101 0
DIIEBG+TimesNewRomanPSMT CID TrueType Identity-H yes yes yes 106 0
DIIEDG+Arial CID TrueType Identity-H yes yes no 112 0
Arial TrueType WinAnsi yes no no 121 0
I need to identify likely problematic fonts based on pdffonts output and count characters based on its font. I achieved it by implementing the following snippet:
def count_fonts_ocurrencies_by_page(pdf_filepath):
page_layout = next(extract_pages(pdf_filepath))
fonts = []
for element in page_layout:
if isinstance(element, LTTextContainer):
for text_line in element:
for character in text_line:
if isinstance(character, LTChar):
fonts.append(character.fontname)
return Counter(fonts)
I'm looking forward to find a straightforward way to do the same (or close, I only need to know something like a percentage of font usage on a single PDF page) without iterating every char (if possible) or maybe without using a whole module, like pdfminer, just for one function and for one PDF page at time. It would be also helpful if I could do something similar (re)using the minimum code from pdfminer, as it's built in a modular way.
You could try using pdftohtml from the same package of pdffonts and then parse html file with xpath taking into account the styles
pdftohtml -f 1 -l 1 -c -s -i -fontfullname fonts.pdf
Generated doc
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang="">
<head>
<title>fonts-html.html</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<br/>
<style type="text/css">
<!--
p {margin: 0; padding: 0;} .ft10{font-size:16px;font-family:BAAAAA+NotoSans-CondensedExtraBold;color:#000000;}
.ft11{font-size:16px;font-family:CAAAAA+DejaVuMathTeXGyre-Regular;color:#000000;}
.ft12{font-size:13px;font-family:DAAAAA+Baekmuk-Headline;color:#000000;}
.ft13{font-size:13px;font-family:EAAAAA+LMMono9-Regular;color:#000000;}
.ft14{font-size:13px;font-family:FAAAAA+CantarellRegular;color:#000000;}
.ft15{font-size:13px;font-family:GAAAAA+Courier;color:#000000;}
-->
</style>
</head>
<body bgcolor="#A0A0A0" vlink="blue" link="blue">
<div id="page1-div" style="position:relative;width:892px;height:1263px;">
<img width="892" height="1263" src="fonts001.png" alt="background image"/>
<p style="position:absolute;top:64px;left:86px;white-space:nowrap" class="ft10"><b>Font1</b></p>
<p style="position:absolute;top:91px;left:86px;white-space:nowrap" class="ft11">font3</p>
<p style="position:absolute;top:109px;left:86px;white-space:nowrap" class="ft12">font4</p>
<p style="position:absolute;top:124px;left:86px;white-space:nowrap" class="ft13">font5</p>
<p style="position:absolute;top:144px;left:86px;white-space:nowrap" class="ft14">font6</p>
<p style="position:absolute;top:163px;left:86px;white-space:nowrap" class="ft15">font7</p>
</div>
</body>
</html>
Parsing html with python and counting characters by font (class attribute)
from lxml import html
tree = html.parse(r'/home/luis/tmp/fonts-html.html')
eleList = tree.xpath("//p[@class='ft10']")
len(eleList[0].text_content())
# text length: 5
eleList = tree.xpath("//p[@class[contains(.,'ft')]]")
eleList[0].get('class')
# class name: 'ft10'