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feat(fonts): honor selected fonts in PDF export

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Interpolate the book's body and heading families into the Typst
preamble, title page, cover, and contents. Embed the needed bundled
fonts and load any chosen system fonts (via fontdb) into the Typst
engine so PDF preview and export match the on-screen fonts.
This commit is contained in:
pj committed 2026-06-22 14:27:51 -04:00
1 parent 9a38976000
commit 7a2d7c6aff
5 files changed
+93 -21
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src-tauri/src/pdf.rs
+48 -3
View File
@@ -10,6 +10,29 @@ static LITERATA: &[u8] = include_bytes!("../../public/fonts/Literata-VF.ttf");
static LITERATA_ITALIC: &[u8] = include_bytes!("../../public/fonts/Literata-Italic-VF.ttf");
static HANKEN: &[u8] = include_bytes!("../../public/fonts/HankenGrotesk-VF.ttf");
static HANKEN_ITALIC: &[u8] = include_bytes!("../../public/fonts/HankenGrotesk-Italic-VF.ttf");
static EB_GARAMOND: &[u8] = include_bytes!("../../public/fonts/EBGaramond-VF.ttf");
static EB_GARAMOND_ITALIC: &[u8] = include_bytes!("../../public/fonts/EBGaramond-Italic-VF.ttf");
static LORA: &[u8] = include_bytes!("../../public/fonts/Lora-VF.ttf");
static LORA_ITALIC: &[u8] = include_bytes!("../../public/fonts/Lora-Italic-VF.ttf");
static SOURCE_SERIF: &[u8] = include_bytes!("../../public/fonts/SourceSerif4-VF.ttf");
static SOURCE_SERIF_ITALIC: &[u8] = include_bytes!("../../public/fonts/SourceSerif4-Italic-VF.ttf");
static FRAUNCES: &[u8] = include_bytes!("../../public/fonts/Fraunces-VF.ttf");
static FRAUNCES_ITALIC: &[u8] = include_bytes!("../../public/fonts/Fraunces-Italic-VF.ttf");
static EB_GARAMOND_FONTS: [&[u8]; 2] = [EB_GARAMOND, EB_GARAMOND_ITALIC];
static LORA_FONTS: [&[u8]; 2] = [LORA, LORA_ITALIC];
static SOURCE_SERIF_FONTS: [&[u8]; 2] = [SOURCE_SERIF, SOURCE_SERIF_ITALIC];
static FRAUNCES_FONTS: [&[u8]; 2] = [FRAUNCES, FRAUNCES_ITALIC];
fn bundled_font_bytes(id: &str) -> &'static [&'static [u8]] {
match id {
"eb-garamond" => &EB_GARAMOND_FONTS,
"lora" => &LORA_FONTS,
"source-serif" => &SOURCE_SERIF_FONTS,
"fraunces" => &FRAUNCES_FONTS,
_ => &[],
}
}
#[derive(Deserialize)]
pub struct ImageInput {
@@ -17,7 +40,12 @@ pub struct ImageInput {
data: String,
}
fn compile(source: String, images: &[ImageInput]) -> Result<(Vec<u8>, String), String> {
fn compile(
source: String,
images: &[ImageInput],
bundled_fonts: &[String],
system_fonts: &[String],
) -> Result<(Vec<u8>, String), String> {
let mut binaries: Vec<(&str, Vec<u8>)> = Vec::with_capacity(images.len());
for image in images {
let bytes = STANDARD
@@ -26,9 +54,24 @@ fn compile(source: String, images: &[ImageInput]) -> Result<(Vec<u8>, String), S
binaries.push((image.path.as_str(), bytes));
}
let mut fonts: Vec<Vec<u8>> = vec![
LITERATA.to_vec(),
LITERATA_ITALIC.to_vec(),
HANKEN.to_vec(),
HANKEN_ITALIC.to_vec(),
];
for id in bundled_fonts {
for bytes in bundled_font_bytes(id) {
fonts.push(bytes.to_vec());
}
}
for family in system_fonts {
fonts.extend(crate::fonts::system_font_bytes(family));
}
let engine = TypstEngine::builder()
.main_file(source)
.fonts([LITERATA, LITERATA_ITALIC, HANKEN, HANKEN_ITALIC])
.fonts(fonts)
.with_static_file_resolver(binaries)
.build();
@@ -50,8 +93,10 @@ pub fn compile_pdf(
source: String,
images: Vec<ImageInput>,
emit_warnings: bool,
bundled_fonts: Vec<String>,
system_fonts: Vec<String>,
) -> Result<tauri::ipc::Response, String> {
let (bytes, warnings) = compile(source, &images)?;
let (bytes, warnings) = compile(source, &images, &bundled_fonts, &system_fonts)?;
if emit_warnings && !warnings.is_empty() {
app.emit("pdf-warnings", warnings).ok();
}