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wezterm: fix infinite recursion when no valid fallbacks are present
This config reproduces the issue: ```lua local wezterm = require "wezterm" return { font_size = 12.0, font_dirs = {"fonts"}, -- relative to this config file font_locator = "ConfigDirsOnly", font = wezterm.font_with_fallback({ -- this is an invalid font "does not exist", -- this is a valid font, with only symbols "Font Awesome 5 Free Solid", }), } ``` the existing protections were a bit simplistic, so now we have a dedicated error type for this case and that stops fallback processing from recursing. closes: https://github.com/wez/wezterm/issues/279
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0e8ac1851d
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@ -4,9 +4,10 @@ use crate::font::hbwrap as harfbuzz;
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use crate::font::locator::FontDataHandle;
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use crate::font::locator::FontDataHandle;
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use crate::font::shaper::{FallbackIdx, FontMetrics, FontShaper, GlyphInfo};
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use crate::font::shaper::{FallbackIdx, FontMetrics, FontShaper, GlyphInfo};
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use crate::font::units::*;
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use crate::font::units::*;
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use anyhow::{anyhow, bail};
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use anyhow::anyhow;
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use log::{debug, error};
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use log::{debug, error};
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use std::cell::{RefCell, RefMut};
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use std::cell::{RefCell, RefMut};
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use thiserror::Error;
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fn make_glyphinfo(
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fn make_glyphinfo(
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text: &str,
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text: &str,
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@ -43,6 +44,12 @@ pub struct HarfbuzzShaper {
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lib: ftwrap::Library,
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lib: ftwrap::Library,
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}
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}
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#[derive(Error, Debug)]
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#[error("No more fallbacks while shaping {}", .text.escape_unicode())]
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struct NoMoreFallbacksError {
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text: String,
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}
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impl HarfbuzzShaper {
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impl HarfbuzzShaper {
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pub fn new(handles: &[FontDataHandle]) -> anyhow::Result<Self> {
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pub fn new(handles: &[FontDataHandle]) -> anyhow::Result<Self> {
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let lib = ftwrap::Library::new()?;
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let lib = ftwrap::Library::new()?;
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@ -119,8 +126,10 @@ impl HarfbuzzShaper {
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pair.font.shape(&mut buf, Some(features.as_slice()));
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pair.font.shape(&mut buf, Some(features.as_slice()));
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}
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}
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None => {
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None => {
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let chars: Vec<u32> = s.chars().map(|c| c as u32).collect();
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return Err(NoMoreFallbacksError {
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bail!("No more fallbacks while shaping {:x?}", chars);
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text: s.to_string(),
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}
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.into());
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}
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}
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}
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}
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}
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}
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@ -188,8 +197,8 @@ impl HarfbuzzShaper {
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Ok(shape) => Ok(shape),
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Ok(shape) => Ok(shape),
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Err(e) => {
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Err(e) => {
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error!("{:?} for {:?}", e, substr);
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error!("{:?} for {:?}", e, substr);
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if font_idx == 0 && s == "?" {
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if e.downcast_ref::<NoMoreFallbacksError>().is_some() {
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bail!("unable to find any usable glyphs for `?` in font_idx 0");
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return Err(e);
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}
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}
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self.do_shape(0, "?", font_size, dpi)
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self.do_shape(0, "?", font_size, dpi)
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}
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}
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@ -230,8 +239,8 @@ impl HarfbuzzShaper {
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Ok(shape) => Ok(shape),
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Ok(shape) => Ok(shape),
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Err(e) => {
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Err(e) => {
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error!("{:?} for {:?}", e, substr);
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error!("{:?} for {:?}", e, substr);
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if font_idx == 0 && s == "?" {
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if e.downcast_ref::<NoMoreFallbacksError>().is_some() {
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bail!("unable to find any usable glyphs for `?` in font_idx 0");
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return Err(e);
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}
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}
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self.do_shape(0, "?", font_size, dpi)
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self.do_shape(0, "?", font_size, dpi)
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}
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}
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