From 25979ab216ca2cc2539696420f23be8508d3184f Mon Sep 17 00:00:00 2001
From: Felix Nie <hongtuo.nie@u.nus.edu>
Date: Wed, 19 Mar 2025 04:43:32 +0000
Subject: [PATCH] feat(fonts): allow PageTitle to have its own font subset (#1848)

---
 quartz/util/theme.ts |   18 +++++++++++++++---
 1 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/quartz/util/theme.ts b/quartz/util/theme.ts
index 56261e3..4a06425 100644
--- a/quartz/util/theme.ts
+++ b/quartz/util/theme.ts
@@ -25,6 +25,7 @@
 
 export interface Theme {
   typography: {
+    title?: FontSpecification
     header: FontSpecification
     body: FontSpecification
     code: FontSpecification
@@ -48,7 +49,10 @@
   return spec.name
 }
 
-function formatFontSpecification(type: "header" | "body" | "code", spec: FontSpecification) {
+function formatFontSpecification(
+  type: "title" | "header" | "body" | "code",
+  spec: FontSpecification,
+) {
   if (typeof spec === "string") {
     spec = { name: spec }
   }
@@ -82,12 +86,19 @@
 }
 
 export function googleFontHref(theme: Theme) {
-  const { code, header, body } = theme.typography
+  const { header, body, code } = theme.typography
   const headerFont = formatFontSpecification("header", header)
   const bodyFont = formatFontSpecification("body", body)
   const codeFont = formatFontSpecification("code", code)
 
-  return `https://fonts.googleapis.com/css2?family=${bodyFont}&family=${headerFont}&family=${codeFont}&display=swap`
+  return `https://fonts.googleapis.com/css2?family=${headerFont}&family=${bodyFont}&family=${codeFont}&display=swap`
+}
+
+export function googleFontSubsetHref(theme: Theme, text: string) {
+  const title = theme.typography.title || theme.typography.header
+  const titleFont = formatFontSpecification("title", title)
+
+  return `https://fonts.googleapis.com/css2?family=${titleFont}&text=${encodeURIComponent(text)}&display=swap`
 }
 
 export interface GoogleFontFile {
@@ -135,6 +146,7 @@
   --highlight: ${theme.colors.lightMode.highlight};
   --textHighlight: ${theme.colors.lightMode.textHighlight};
 
+  --titleFont: "${getFontSpecificationName(theme.typography.title || theme.typography.header)}", ${DEFAULT_SANS_SERIF};
   --headerFont: "${getFontSpecificationName(theme.typography.header)}", ${DEFAULT_SANS_SERIF};
   --bodyFont: "${getFontSpecificationName(theme.typography.body)}", ${DEFAULT_SANS_SERIF};
   --codeFont: "${getFontSpecificationName(theme.typography.code)}", ${DEFAULT_MONO};

--
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