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textpath encoding#12928

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tacaswell merged 4 commits into
matplotlib:masterfrom
anntzer:textpath-encoding
Apr 2, 2019
Merged

textpath encoding#12928
tacaswell merged 4 commits into
matplotlib:masterfrom
anntzer:textpath-encoding

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@anntzer anntzer commented Dec 3, 2018 •
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PR Summary

Consider the following example.

import matplotlib.pyplot as plt
plt.rcParams['text.usetex'] = True
plt.rcParams['text.latex.preamble'] = r'\usepackage{siunitx}'
plt.rcParams['text.hinting_factor'] = 1
plt.text(.5, .5, r'$\si{\degree}$')
plt.text(.5, .4, r'ff\textwon')
plt.gca().set_axis_off()
plt.savefig('/tmp/plot.svg')
plt.savefig('/tmp/plot.pdf')
plt.savefig('/tmp/plot.png')
plt.show()

In the svg output, one sees that the \degree and \textwon characters
(which come from a different font that the ff ligature) are now
correctly loaded, but at a too small size -- this still needs to be
fixedn but is already better than not loading the glyphs at all.
(pdf and png output are unaffected.)
screenshot_20181203_174540

Supersedes #8286, #8415 (from which a test is taken).
Fixes part of #8068, #8280 (the glyph-loading part; the sizing issue is a bug this PR newly exposes).

Likely the bad font sizing has something to do with the use, in textpath.py of self.FONT_SCALE rather than prop.get_size_in_points()/dvifont.size...

PR Checklist

  • Has Pytest style unit tests
  • Code is Flake 8 compliant
  • New features are documented, with examples if plot related
  • Documentation is sphinx and numpydoc compliant
  • Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
  • Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way

@anntzer anntzer added this to the v3.1 milestone Dec 3, 2018
@anntzer anntzer force-pushed the textpath-encoding branch 2 times, most recently from 04dfa60 to 83f2d64 Compare December 3, 2018 20:41
anntzer
anntzer commented Dec 4, 2018
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Comment thread lib/matplotlib/textpath.py Outdated
# If psfonts.map specifies no encoding, the indices directly map to
# the font's builtin charmap (see the pdftex manual, section 6.1
# -- Map files); so don't use the FreeType-synthesized charmap but
# the native ones (we can't directly identify it but it's typically
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@anntzer anntzer Dec 4, 2018

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See also http://lists.nongnu.org/archive/html/freetype/2018-12/msg00001.html.

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anntzer commented Dec 6, 2018 •
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Very empirically, it looks like glyphs are correctly sized (across multiple of font sizes) with

diff --git i/lib/matplotlib/textpath.py w/lib/matplotlib/textpath.py
index 8ef6187bd..d306e82c8 100644
--- i/lib/matplotlib/textpath.py
+++ w/lib/matplotlib/textpath.py
@@ -315,7 +315,7 @@ class TextToPath(object):
 
             if char_id not in glyph_map:
                 font.clear()
-                font.set_size(self.FONT_SCALE, self.DPI)
+                font.set_size(self.FONT_SCALE ** 2 / dvifont.size, self.DPI)
                 # See comments in _get_ps_font_and_encoding.
                 if enc is not None:
                     index = font.get_name_index(enc[glyph])

which doesn't look completely nuts, but I haven't tracked down all the resizings either.

@anntzer anntzer force-pushed the textpath-encoding branch 2 times, most recently from 533b875 to 2077dc9 Compare December 7, 2018 14:57
jklymak
jklymak approved these changes Mar 4, 2019
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Not clear on all details, but this seems to work...

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anntzer commented Mar 4, 2019

rebased

@anntzer anntzer force-pushed the textpath-encoding branch from 2077dc9 to 976e779 Compare March 4, 2019 20:57
tacaswell
tacaswell reviewed Apr 2, 2019
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Comment thread lib/matplotlib/textpath.py Outdated
glyph0 = font.load_char(charcode, flags=ft2font_flag)
# See comments in _get_ps_font_and_encoding.
if enc is not None:
index = font.get_name_index(enc[glyph])
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this used to handle the case where glyph not in enc where as this looks like it will now raise KeyError. Is this a change we want to make?

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@anntzer anntzer Apr 2, 2019 •
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Restored handling of glyph not in enc (in the last commit). Not sure why I removed this in the first place.

tacaswell
tacaswell approved these changes Apr 2, 2019
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modulo the question about changing .get -> [].

@anntzer anntzer force-pushed the textpath-encoding branch from 976e779 to 51436bf Compare April 2, 2019 09:35
anntzer and others added 4 commits April 2, 2019 13:54
@anntzer
Fix loading of encoded fonts in textpath.
2c0f5ec 
Consider the following example.

    import matplotlib.pyplot as plt
    plt.rcParams['text.usetex'] = True
    plt.rcParams['text.latex.preamble'] = r'\usepackage{siunitx}'
    plt.rcParams['text.hinting_factor'] = 1
    plt.text(.5, .5, r'$\si{\degree}$')
    plt.text(.5, .4, r'ff\textwon')
    plt.gca().set_axis_off()
    plt.savefig('/tmp/plot.svg')
    plt.savefig('/tmp/plot.pdf')
    plt.savefig('/tmp/plot.png')
    plt.show()

In the svg output, one sees that the \degree and \textwon characters
(which come from a different font that the ff ligature) are now
correctly loaded, *but* at a too small size -- this still needs to be
fixed.
(pdf and png output are unaffected.)
@anntzer
Added test encoding issue in SVG backend
88e1b53
@anntzer
Fix the cherry-picked test.
c5f2bbe
@anntzer
Properly warn when glyph is not in encoding.
722de6f
@anntzer anntzer force-pushed the textpath-encoding branch from 51436bf to 722de6f Compare April 2, 2019 11:54
@tacaswell tacaswell merged commit a2277af into matplotlib:master Apr 2, 2019
meeseeksmachine pushed a commit to meeseeksmachine/matplotlib that referenced this pull request Apr 2, 2019
@tacaswell
Backport PR matplotlib#12928: textpath encoding
4ffbeeb
@meeseeksmachine meeseeksmachine mentioned this pull request Apr 2, 2019
Merged
@anntzer anntzer deleted the textpath-encoding branch April 2, 2019 13:25
dstansby added a commit that referenced this pull request Apr 2, 2019
@dstansby
Merge pull request #13841 from meeseeksmachine/auto-backport-of-pr-12…
9f39678 
…928-on-v3.1.x

Backport PR #12928 on branch v3.1.x (textpath encoding)
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