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Fix subset tag for color fonts (#3960)

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Ana Gelez 2024-04-19 16:33:49 +02:00 committed by GitHub
parent b9457421de
commit 0bb45b335f
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1 changed files with 7 additions and 2 deletions
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9
crates/typst-pdf/src/font.rs
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@ -1,4 +1,5 @@
use std::collections::BTreeMap;
use std::hash::Hash;
use std::sync::Arc;
use ecow::{eco_format, EcoString};
@ -153,6 +154,7 @@ fn write_color_fonts(ctx: &mut PdfContext) {
let glyph_count = end - start;
let subset = &color_font.glyphs[start..end];
let mut widths = Vec::new();
let mut gids = Vec::new();
let scale_factor = font.ttf().units_per_em() as f32;
@ -182,6 +184,7 @@ fn write_color_fonts(ctx: &mut PdfContext) {
// Use this stream as instructions to draw the glyph.
glyphs_to_instructions.push(instructions_stream_ref);
gids.push(color_glyph.gid);
}
// Write the Type3 font object.
@ -229,10 +232,12 @@ fn write_color_fonts(ctx: &mut PdfContext) {
ctx.pdf.cmap(cmap_ref, &cmap.finish());
// Write the font descriptor.
gids.sort();
let subset_tag = subset_tag(&gids);
let postscript_name = font
.find_name(name_id::POST_SCRIPT_NAME)
.unwrap_or_else(|| "unknown".to_string());
let base_font = eco_format!("COLOR{font_index:x}+{postscript_name}");
let base_font = eco_format!("{subset_tag}+{postscript_name}");
write_font_descriptor(&mut ctx.pdf, descriptor_ref, &font, &base_font);
// Write the widths array
@ -312,7 +317,7 @@ fn subset_font(font: &Font, glyphs: &[u16]) -> Arc<Vec<u8>> {
}
/// Produce a unique 6 letter tag for a glyph set.
fn subset_tag(glyphs: &BTreeMap<u16, EcoString>) -> EcoString {
fn subset_tag<T: Hash>(glyphs: &T) -> EcoString {
const LEN: usize = 6;
const BASE: u128 = 26;
let mut hash = typst::util::hash128(&glyphs);