High DPI setup.

README.rst

@@ -21,6 +21,11 @@ and the PixelPerfect setup:
 
 .. image:: https://github.com/dumol/PixelPerfect/raw/assets/Debian10.gif
 
+This setup doesn't include any "color fonts". Emoji symbols, up to and including
+those from Unicode 15.0, are supported through a regular "black emoji" font.
+For coloured emoji, install an emoji font supported by your OS and apps.
+There is currently no acceptable solution to cover all cases.
+
 
 Installation
 ------------
@@ -37,6 +42,32 @@ Installation
    ``~/.local/share/fonts/``.
 3. Logout and login again.
 
+To set GNOME fonts from command line::
+
+    gsettings set org.gnome.desktop.interface font-name 'system-ui 11'
+    gsettings set org.gnome.desktop.interface document-font-name 'ui-serif 10'
+    gsettings set org.gnome.desktop.interface monospace-font-name 'ui-monospace 10'
+
+Adjust the above sizes if needed. Alternatively, set a scaling factor for text.
+For example, instead of using sizes of 13 and 12 points for the above, use::
+
+    gsettings set org.gnome.desktop.interface text-scaling-factor "1.2"
+
+Beware that `text-scaling-factor` usually also affects the size of app widgets.
+For example, UI elements in Firefox, like the address bar and tabs, get bigger.
+
+To have this setup working for Flatpak apps::
+
+    flatpak override --user --filesystem=xdg-config/fontconfig:ro
+    flatpak override --user --filesystem=xdg-data/fonts:ro
+
+To have this setup working for a Snap package such as Firefox::
+
+    ln -s ~/.local/share/fonts ~/snap/firefox/current/.local/share/fonts
+    mv -v ~/snap/firefox/current/.config/fontconfig{,.orig}
+    ln -s ~/.config/fontconfig ~/snap/firefox/current/.config/fontconfig
+    fc-cache -f -r
+
 
 Development
 -----------

common.conf

@@ -10,84 +10,112 @@
          low DPI screens, but they are typically used at bigger sizes. -->
 
 
-        <!-- Metrically-identical replacements. -->
+        <!-- Metrically-identical fonts. -->
 
-    <!-- Arial Black, Helvetica Black, Nimbus Sans Black.
-         The hinted TTF for low DPI setups, the OTFs for high DPI. -->
-    <include prefix="xdg">fontconfig/common/archivo-black.conf</include>
-
-    <!-- Some of the URW base 35 fonts. TTF for low DPI, OTF for high DPI.
-         Only those good enough for loDPI screens too, because they are either:
+    <!-- Some of the URW base 35 fonts are included below.
+         Only those good enough for low DPI screens because they are either:
              * highly legible even at small sizes (Century Gothic),
              * not typically used at very small sizes (Palatino),
-             * or of special type (Dingbats, Symbol). -->
+             * or of special type (Dingbats, Symbols). -->
 
     <!-- Avant Garde, Century Gothic, etc.
          Century Gothic used on: https://www.nationalgeographic.com (fallback),
-         https://e.foundation. -->
+         https://e.foundation, etc. -->
     <include prefix="xdg">fontconfig/common/urw-gothic.conf</include>
 
-    <!-- Bitter. An open-source font frequently used for the web.
-         TTF version from the googlefontdirectory repo is to be
-         used on low DPI screens. Latest version only for high DPI screens.
-         Used on: https://arstechnica.com. -->
-    <include prefix="xdg">fontconfig/common/bitter.conf</include>
-
     <!-- Book Antiqua, Palatino, Palatino Lynotype, etc.
-         Palatino used on: https://www.nature.com (fallback). -->
+         Palatino used on: https://wikipedia.org (fallback),
+         https://www.nature.com (fallback), etc. -->
     <include prefix="xdg">fontconfig/common/urw-p052.conf</include>
 
+    <!-- Bebas Neue. Used on https://arstechnica.com. -->
+    <include prefix="xdg">fontconfig/common/bebasneue.conf</include>
+
+    <!-- Charter, Bitstream Charter, ITC Charter.
+         Used on: https://medium.com, https://www.popularmechanics.com, etc. -->
+    <include prefix="xdg">fontconfig/common/charter.conf</include>
+
+    <!-- Comic Sans MS, Chalkboard. The latter is not metrically-identical.
+         Comic Sans MS used on: https://youtube.com (Casual subtitles), etc. -->
+    <include prefix="xdg">fontconfig/common/comic-relief.conf</include>
+
+    <!-- DejaVu Serif, Bitstream Vera Serif.  -->
+    <include prefix="xdg">fontconfig/common/dejavu-serif.conf</include>
+
     <!-- Dingbats, Zapf Dingbats, etc. -->
     <include prefix="xdg">fontconfig/common/urw-d050000l.conf</include>
 
-    <!-- Symbols, etc. -->
-    <include prefix="xdg">fontconfig/common/urw-standard-symbols-ps.conf</include>
+    <!-- Oswald.
+         Used on:https://www.wired.com, https://scitechdaily.com, etc. -->
+    <include prefix="xdg">fontconfig/common/oswald.conf</include>
 
-    <!-- Some more rules that come with the above URW base fonts. -->
-    <include prefix="xdg">fontconfig/common/urw-fallback-backwards.conf</include>
-    <include prefix="xdg">fontconfig/common/urw-fallback-generics.conf</include>
-    <include prefix="xdg">fontconfig/common/urw-fallback-specifics.conf</include>
+    <!-- Playfair Display.
+         Used on: www.merriam-webster.com, etc. -->
 
-    <!-- Charter, Bitstream Charter, ITC Charter.
-         Used on: https://medium.com, https://www.economist.com (fallback). -->
-    <include prefix="xdg">fontconfig/common/charter.conf</include>
+    <!-- PT Sans.
+         Used on: https://time.com, https://astronomy.com. -->
+    <include prefix="xdg">fontconfig/common/pt-sans.conf</include>
 
-    <!-- Comic Sans MS, Chalkboard. The latter is not metrically-identical. -->
-    <include prefix="xdg">fontconfig/common/comic-relief.conf</include>
+    <!-- PT Serif.
+         Used on https://time.com, https://www.science.org. -->
+    <include prefix="xdg">fontconfig/common/pt-serif.conf</include>
 
-        <!-- End of metrically-identical replacements -->
+    <!-- Standard Symbols PS, Standard Symbols L. -->
+    <include prefix="xdg">fontconfig/common/urw-standard-symbols-ps.conf</include>
+
+    <!-- Symbol. Symbol Neu. From Google's Croscore 1.23.0 package for ChromeOS.
+         Newer versions no longer include it, as web browsers have
+         custom glyph mappings for symbols nowadays. -->
+    <include prefix="xdg">fontconfig/common/symbol-neu.conf</include>
+
+    <!-- Ubuntu Mono.
+         Used on some sites, e.g. https://ubuntu.com. -->
+    <include prefix="xdg">fontconfig/common/ubuntu-mono.conf</include>
+
+        <!-- End of metrically-identical fonts -->
 
 
         <!-- From here on, matches are not that great,
              but it's better to differentiate these typefaces. -->
 
         <!-- Fonts perfectly hinted at small sizes. -->
 
-    <!-- Trebuchet MS. TTF version from the googlefontdirectory repo is to be
+    <!-- Lucida Bright, PT Serif Caption. A bit better than the default serif.
+         Used on https://www.spiegel.de (fallback). -->
+    <include prefix="xdg">fontconfig/common/pt-serif-caption.conf</include>
+
+    <!-- Trebuchet MS, Cabin. TTF version from googlefontdirectory repo to be
          used on low DPI screens. Latest version only for high DPI screens.
-         Used on: https://www.lidl.com, https://www.nih.gov (fallback). -->
+         Trebuchet MS used on: https://lidl.com, https://www.nih.gov (fallback).
+         Cabin used on: https://streamable.com. -->
     <include prefix="xdg">fontconfig/common/cabin.conf</include>
 
         <!-- End of list of fonts perfectly hinted at small sizes. -->
 
 
+    <!-- Arial Black, Helvetica Black, Nimbus Sans Black.
+         Vivus Black is Geist Black with a new name for utilitarian reasons.
+         Similar fonts: Nacelle Black, Archivo Black, Public Sans Black. -->
+    <include prefix="xdg">fontconfig/common/vivus-black.conf</include>
+
     <!-- Arial Rounded MT Bold, Helvetica Rounded LT Std Bold. -->
     <include prefix="xdg">fontconfig/common/varela-round.conf</include>
 
-    <!-- Baskerville, Baskerville Old Face, Baskerville PT.
+    <!-- Baskerville, Baskerville Old Face, Baskerville PT, Libre Baskerville.
          Used on: https://theconversation.com, https://www.the-scientist.com.-->
     <include prefix="xdg">fontconfig/common/libre-baskerville.conf</include>
 
     <!-- Brush Script MT. -->
     <include prefix="xdg">fontconfig/common/kaushan-script.conf</include>
 
+    <!-- Cooper Black. -->
+    <include prefix="xdg">fontconfig/common/cooper.conf</include>
+
     <!-- Copperplate, Copperplate Gothic. -->
     <include prefix="xdg">fontconfig/common/cinzel-decorative.conf</include>
 
-    <!-- Economica, Impact.
-         Economica used on: https://arstechnica.com.
-         Impact used on: https://www.rottentomatoes.com (fallback). -->
-    <include prefix="xdg">fontconfig/common/oswald.conf</include>
+    <!-- Impact. Used on: https://www.rottentomatoes.com (fallback). -->
+    <include prefix="xdg">fontconfig/common/anton.conf</include>
 
     <!-- Garamond, Garamond MT, Garamond Premier Pro.
          Used on: https://theatlantic.com, https://harpers.org (fallback). -->
@@ -98,21 +126,38 @@
          (fallback). -->
     <include prefix="xdg">fontconfig/common/gillius-adf-no2.conf</include>
 
+    <!-- Lucida Grande, Lucida Sans, Lucida Sans Unicode, Luxi Sans.
+         Lucida Grande used on https://soundcloud.com, https://arxiv.org, etc.
+         Lucida Sans Unicode used on https://telegram.org (fallback). -->
+    <include prefix="xdg">fontconfig/common/go.conf</include>
 
-        <!-- Emoji settings and aliases -->
-
-    <!-- Twemoji and derivatives is better for Firefox-based browsers.
-         For Chrome-based ones, Noto Color Emoji is best. -->
-    <include prefix="xdg">fontconfig/common/twitter-color-emoji.conf</include>
+    <!-- Luxi Mono. -->
+    <include prefix="xdg">fontconfig/common/go-mono.conf</include>
 
+    <!-- Noto Sans Math, Latin Modern Math, STIX Two Math, XITS Math,
+         Cambria Math, STIX Math, Asana Math. -->
+    <include prefix="xdg">fontconfig/common/noto-sans-math.conf</include>
 
-        <!-- Extra rules -->
 
+    <!-- Better than nothing when blocking remote fonts. -->
+    <alias binding="same">
+        <family>Font Awesome 5 Pro</family>
+        <accept>
+            <family>Font Awesome 5 Free</family>
+        </accept>
+    </alias>
     <alias binding="same">
-        <family>Font Awesome</family>
-        <prefer>
-            <family>Font Awesome 5 Free Solid</family>
-        </prefer>
+        <family>Font Awesome 6 Pro</family>
+        <accept>
+            <family>Font Awesome 6 Free</family>
+        </accept>
     </alias>
 
+
+        <!-- Emoji settings and aliases -->
+
+    <!-- Extend emoji aliases, improve font choices for emoji characters
+         and, optionally, always substitute a preferred emoji font. -->
+    <include prefix="xdg">fontconfig/common/emoji.conf</include>
+
 </fontconfig>

common/anton.conf

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
+<fontconfig>
+    <!-- Font substitution rules -->
+    <alias binding="same">
+        <family>Impact</family>
+        <prefer>
+            <family>Anton</family>
+        </prefer>
+    </alias>
+</fontconfig>

common/bebasneue.conf

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
+<fontconfig>
+    <!-- For https://arstechnica.com on FF mobile when blocking remote fonts.-->
+    <alias binding="same">
+        <family>bebasneue</family>
+        <prefer>
+            <family>Bebas Neue</family>
+        </prefer>
+    </alias>
+</fontconfig>

common/cabin.conf

@@ -4,9 +4,9 @@
     <!-- Generic name aliasing -->
     <alias>
         <family>sans-serif</family>
-        <prefer>
+        <accept>
             <family>Cabin</family>
-        </prefer>
+        </accept>
     </alias>
 
     <!-- Generic name assignment -->
@@ -24,4 +24,12 @@
             <family>Cabin</family>
         </prefer>
     </alias>
+
+    <!-- For https://www.imdb.com when blocking remote fonts. -->
+    <alias binding="same">
+        <family>Trebuchet</family>
+        <prefer>
+            <family>Cabin</family>
+        </prefer>
+    </alias>
 </fontconfig>

common/charter.conf

@@ -4,9 +4,9 @@
     <!-- Generic name aliasing -->
     <alias>
         <family>serif</family>
-        <prefer>
+        <accept>
             <family>Charter</family>
-        </prefer>
+        </accept>
     </alias>
 
     <!-- Generic name assignment -->
@@ -25,10 +25,10 @@
         </prefer>
     </alias>
 
-    <!-- Not really. But better than the default serif. -->
+
     <alias binding="same">
-        <!-- On https://www.reuters.com.-->
-        <family>freight-book</family>
+        <!-- On https://www.telegra.ph. -->
+        <family>Charter ITC Pro</family>
         <prefer>
             <family>Charter</family>
         </prefer>

common/cinzel-decorative.conf

@@ -4,9 +4,9 @@
     <!-- Generic name aliasing -->
     <alias>
         <family>fantasy</family>
-        <prefer>
+        <accept>
             <family>Cinzel</family>
-        </prefer>
+        </accept>
     </alias>
 
     <!-- Generic name assignment -->

common/comic-relief.conf

@@ -4,9 +4,9 @@
     <!-- Generic name aliasing -->
     <alias>
         <family>cursive</family>
-        <prefer>
+        <accept>
             <family>Comic Relief</family>
-        </prefer>
+        </accept>
     </alias>
 
     <!-- Generic name assignment -->
@@ -17,14 +17,6 @@
         </default>
     </alias>
 
-    <!-- Base font mapping -->
-    <alias binding="same">
-        <family>Comic Relief</family>
-        <default>
-            <family>Comic Sans MS</family>
-        </default>
-    </alias>
-
     <!-- Font substitution rules -->
     <alias binding="same">
         <family>Chalkboard</family>

common/cooper.conf

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
+<fontconfig>
+    <!-- Font substitution rules -->
+    <alias binding="same">
+        <family>Cooper Black</family>
+        <prefer>
+            <family>Cooper* Black</family>
+        </prefer>
+    </alias>
+</fontconfig>

lowdpi/dejavu-serif.conf → common/dejavu-serif.conf

@@ -7,9 +7,9 @@
 
     <!-- Base font mapping -->
     <alias binding="same">
-        <family>Bitstream Vera Serif</family>
+        <family>DejaVu Serif</family>
         <default>
-            <family>DejaVu Serif</family>
+            <family>Bitstream Vera Serif</family>
         </default>
     </alias>