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https://github.com/alacritty/alacritty
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Reuse Rasterizer in Display::new
Instead of creating a `Rasterizer` to guess the window dimensions, dropping it and then creating a new one for the glyph cache, reuse the same `Rasterizer`. This prevents the font from being loaded twice during startup.
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@ -232,7 +232,8 @@ impl Display {
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};
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// Guess the target window dimensions.
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let metrics = GlyphCache::static_metrics(config.font.clone(), estimated_dpr)?;
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let mut rasterizer = Rasterizer::new(estimated_dpr as f32, config.font.use_thin_strokes)?;
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let metrics = GlyphCache::static_metrics(&mut rasterizer, config.font.clone())?;
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let (cell_width, cell_height) = compute_cell_size(config, &metrics);
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// Guess the target window size if the user has specified the number of lines/columns.
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@ -256,12 +257,13 @@ impl Display {
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)?;
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info!("Device pixel ratio: {}", window.dpr);
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rasterizer.update_dpr(window.dpr as f32);
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// Create renderer.
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let mut renderer = QuadRenderer::new()?;
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let (glyph_cache, cell_width, cell_height) =
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Self::new_glyph_cache(window.dpr, &mut renderer, config)?;
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Self::new_glyph_cache(rasterizer, &mut renderer, config)?;
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if let Some(dimensions) = dimensions {
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if (estimated_dpr - window.dpr).abs() < f64::EPSILON {
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@ -361,12 +363,11 @@ impl Display {
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}
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fn new_glyph_cache(
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dpr: f64,
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rasterizer: Rasterizer,
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renderer: &mut QuadRenderer,
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config: &UiConfig,
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) -> Result<(GlyphCache, f32, f32), Error> {
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let font = config.font.clone();
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let rasterizer = Rasterizer::new(dpr as f32, config.font.use_thin_strokes)?;
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// Initialize glyph cache.
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let glyph_cache = {
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@ -404,10 +404,12 @@ impl GlyphCache {
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}
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/// Calculate font metrics without access to a glyph cache.
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pub fn static_metrics(font: Font, dpr: f64) -> Result<crossfont::Metrics, crossfont::Error> {
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let mut rasterizer = crossfont::Rasterizer::new(dpr as f32, font.use_thin_strokes)?;
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pub fn static_metrics(
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rasterizer: &mut crossfont::Rasterizer,
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font: Font,
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) -> Result<crossfont::Metrics, crossfont::Error> {
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let regular_desc = GlyphCache::make_desc(font.normal(), Slant::Normal, Weight::Normal);
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let regular = Self::load_regular_font(&mut rasterizer, ®ular_desc, font.size())?;
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let regular = Self::load_regular_font(rasterizer, ®ular_desc, font.size())?;
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rasterizer.get_glyph(GlyphKey { font_key: regular, character: 'm', size: font.size() })?;
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rasterizer.metrics(regular, font.size())
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