fix: Replaced Bookerly with Noto Serif for licensing reasons (#1736)

## Summary

Fixes #258. Bookerly is not licensed for use in CrossPoint. Switched to
Google's open Noto Serif font.

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**NO**_

lib/EpdFont/scripts/build-font-ids.sh

@@ -8,39 +8,39 @@ echo "// The contents of this file are generated by ./lib/EpdFont/scripts/build-
 echo "#pragma once"
 echo ""
 
-echo "#define BOOKERLY_12_FONT_ID ($(
+echo "#define NOTOSERIF_12_FONT_ID ($(
 ruby -rdigest -e 'puts [
-  "./bookerly_12_regular.h",
-  "./bookerly_12_bold.h",
-  "./bookerly_12_bolditalic.h",
-  "./bookerly_12_italic.h",
+  "./notoserif_12_regular.h",
+  "./notoserif_12_bold.h",
+  "./notoserif_12_bolditalic.h",
+  "./notoserif_12_italic.h",
 ].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
 ))"
 
-echo "#define BOOKERLY_14_FONT_ID ($(
+echo "#define NOTOSERIF_14_FONT_ID ($(
 ruby -rdigest -e 'puts [
-  "./bookerly_14_regular.h",
-  "./bookerly_14_bold.h",
-  "./bookerly_14_bolditalic.h",
-  "./bookerly_14_italic.h",
+  "./notoserif_14_regular.h",
+  "./notoserif_14_bold.h",
+  "./notoserif_14_bolditalic.h",
+  "./notoserif_14_italic.h",
 ].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
 ))"
 
-echo "#define BOOKERLY_16_FONT_ID ($(
+echo "#define NOTOSERIF_16_FONT_ID ($(
 ruby -rdigest -e 'puts [
-  "./bookerly_16_regular.h",
-  "./bookerly_16_bold.h",
-  "./bookerly_16_bolditalic.h",
-  "./bookerly_16_italic.h",
+  "./notoserif_16_regular.h",
+  "./notoserif_16_bold.h",
+  "./notoserif_16_bolditalic.h",
+  "./notoserif_16_italic.h",
 ].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
 ))"
 
-echo "#define BOOKERLY_18_FONT_ID ($(
+echo "#define NOTOSERIF_18_FONT_ID ($(
 ruby -rdigest -e 'puts [
-  "./bookerly_18_regular.h",
-  "./bookerly_18_bold.h",
-  "./bookerly_18_bolditalic.h",
-  "./bookerly_18_italic.h",
+  "./notoserif_18_regular.h",
+  "./notoserif_18_bold.h",
+  "./notoserif_18_bolditalic.h",
+  "./notoserif_18_italic.h",
 ].map{|f| Digest::SHA256.hexdigest(File.read(f)).to_i(16) }.sum % (2 ** 32) - (2 ** 31)'
 ))"
 

lib/EpdFont/scripts/convert-builtin-fonts.sh

@@ -5,14 +5,14 @@ set -e
 cd "$(dirname "$0")"
 
 READER_FONT_STYLES=("Regular" "Italic" "Bold" "BoldItalic")
-BOOKERLY_FONT_SIZES=(12 14 16 18)
+NOTOSERIF_FONT_SIZES=(12 14 16 18)
 NOTOSANS_FONT_SIZES=(12 14 16 18)
 OPENDYSLEXIC_FONT_SIZES=(8 10 12 14)
 
-for size in ${BOOKERLY_FONT_SIZES[@]}; do
+for size in ${NOTOSERIF_FONT_SIZES[@]}; do
   for style in ${READER_FONT_STYLES[@]}; do
-    font_name="bookerly_${size}_$(echo $style | tr '[:upper:]' '[:lower:]')"
-    font_path="../builtinFonts/source/Bookerly/Bookerly-${style}.ttf"
+    font_name="notoserif_${size}_$(echo $style | tr '[:upper:]' '[:lower:]')"
+    font_path="../builtinFonts/source/NotoSerif/NotoSerif-${style}.ttf"
     output_path="../builtinFonts/${font_name}.h"
     python fontconvert.py $font_name $size $font_path --2bit --compress --pnum > $output_path
     echo "Generated $output_path"

lib/EpdFont/scripts/fontconvert.py

@@ -630,7 +630,7 @@ def extract_ligatures_fonttools(font_path, codepoints):
         # Find lookup indices for ligature features.
         # Currently extracts 'liga' (standard) and 'rlig' (required) only.
         # To also extract discretionary or historical ligatures, add:
-        #   'dlig' - Discretionary Ligatures (e.g., ft, st in Bookerly)
+        #   'dlig' - Discretionary Ligatures (e.g., ft, st in Noto)
         #   'hlig' - Historical Ligatures (e.g., long-s+t in OpenDyslexic)
         # These are off by default in standard text renderers.
         LIGATURE_FEATURES = ('liga', 'rlig')