Add Windows font fallback
This commit is contained in:
David Hewitt
GitHub
parent
33abfe34a8
commit
840cb1b93a
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@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
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- Vi mode for copying text and opening links
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- `CopySelection` action which copies into selection buffer on Linux/BSD
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- Option `cursor.thickness` to set terminal cursor thickness
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- Font fallback on Windows
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### Changed
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@ -465,7 +465,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "dwrote"
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version = "0.9.0"
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version = "0.11.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -473,6 +473,7 @@ dependencies = [
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"serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
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"serde_derive 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
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"winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
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"wio 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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@ -548,13 +549,14 @@ dependencies = [
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"core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"core-graphics 0.17.3 (registry+https://github.com/rust-lang/crates.io-index)",
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"core-text 13.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"dwrote 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"dwrote 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"euclid 0.20.7 (registry+https://github.com/rust-lang/crates.io-index)",
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"foreign-types 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"freetype-rs 0.24.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
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"log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
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"servo-fontconfig 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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@ -2123,6 +2125,14 @@ dependencies = [
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"winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "wio"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "ws2_32-sys"
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version = "0.2.1"
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@ -2239,7 +2249,7 @@ dependencies = [
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"checksum dlib 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "77e51249a9d823a4cb79e3eca6dcd756153e8ed0157b6c04775d04bf1b13b76a"
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"checksum downcast-rs 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "52ba6eb47c2131e784a38b726eb54c1e1484904f013e576a25354d0124161af6"
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"checksum dtoa 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "4358a9e11b9a09cf52383b451b49a169e8d797b68aa02301ff586d70d9661ea3"
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"checksum dwrote 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0bd1369e02db5e9b842a9b67bce8a2fcc043beafb2ae8a799dd482d46ea1ff0d"
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"checksum dwrote 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "439a1c2ba5611ad3ed731280541d36d2e9c4ac5e7fb818a27b604bdc5a6aa65b"
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"checksum embed-resource 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "bbaba4684ab0af1cbb3ef0b1f540ddc4b57b31940c920ea594efe09ab86e2a6c"
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"checksum env_logger 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "44533bbbb3bb3c1fa17d9f2e4e38bbbaf8396ba82193c4cb1b6445d711445d36"
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"checksum euclid 0.20.7 (registry+https://github.com/rust-lang/crates.io-index)" = "3f852d320142e1cceb15dccef32ed72a9970b83109d8a4e24b1ab04d579f485d"
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@ -2431,6 +2441,7 @@ dependencies = [
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"checksum winpty 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "92c5a39bb2408a307dd5ab774039ec3f2c68d052970ae4dacc346101abe202b2"
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"checksum winpty-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ed8a179a59760dc51d30b5e6eaf1bd6da88461f72f2616e962ddebef7e413210"
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"checksum winreg 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b2986deb581c4fe11b621998a5e53361efe6b48a151178d0cd9eeffa4dc6acc9"
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"checksum wio 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "5d129932f4644ac2396cb456385cbf9e63b5b30c6e8dc4820bdca4eb082037a5"
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"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
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"checksum x11-clipboard 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e5e937afd03b64b7be4f959cc044e09260a47241b71e56933f37db097bf7859d"
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"checksum x11-dl 2.18.5 (registry+https://github.com/rust-lang/crates.io-index)" = "2bf981e3a5b3301209754218f962052d4d9ee97e478f4d26d4a6eced34c1fef8"
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@ -23,4 +23,5 @@ core-graphics = "0.17"
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core-foundation-sys = "0.6"
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[target.'cfg(windows)'.dependencies]
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dwrote = { version = "0.9.0" }
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dwrote = { version = "0.11" }
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winapi = { version = "0.3", features = ["impl-default"] }
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@ -13,30 +13,164 @@
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// limitations under the License.
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//
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//! Rasterization powered by DirectWrite
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use dwrote::{FontCollection, FontStretch, FontStyle, FontWeight, GlyphOffset, GlyphRunAnalysis};
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use std::borrow::Cow;
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use std::collections::HashMap;
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use std::ffi::OsString;
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use std::fmt::{self, Display, Formatter};
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use std::os::windows::ffi::OsStringExt;
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use dwrote::{
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FontCollection, FontFace, FontFallback, FontStretch, FontStyle, FontWeight, GlyphOffset,
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GlyphRunAnalysis, TextAnalysisSource, TextAnalysisSourceMethods, DWRITE_GLYPH_RUN,
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};
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use winapi::shared::ntdef::{HRESULT, LOCALE_NAME_MAX_LENGTH};
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use winapi::um::dwrite;
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use winapi::um::winnls::GetUserDefaultLocaleName;
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use super::{
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BitmapBuffer, FontDesc, FontKey, GlyphKey, Metrics, RasterizedGlyph, Size, Slant, Style, Weight,
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};
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/// Cached DirectWrite font.
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struct Font {
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face: FontFace,
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family_name: String,
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weight: FontWeight,
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style: FontStyle,
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stretch: FontStretch,
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}
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pub struct DirectWriteRasterizer {
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fonts: Vec<dwrote::FontFace>,
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fonts: HashMap<FontKey, Font>,
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keys: HashMap<FontDesc, FontKey>,
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device_pixel_ratio: f32,
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available_fonts: FontCollection,
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fallback_sequence: Option<FontFallback>,
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}
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impl DirectWriteRasterizer {
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fn rasterize_glyph(
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&self,
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face: &FontFace,
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size: Size,
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c: char,
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) -> Result<RasterizedGlyph, Error> {
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let glyph_index = self.get_glyph_index(face, c)?;
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let em_size = em_size(size);
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let glyph_run = DWRITE_GLYPH_RUN {
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fontFace: unsafe { face.as_ptr() },
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fontEmSize: em_size,
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glyphCount: 1,
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glyphIndices: &glyph_index,
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glyphAdvances: &0.0,
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glyphOffsets: &GlyphOffset::default(),
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isSideways: 0,
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bidiLevel: 0,
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};
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let rendering_mode = face.get_recommended_rendering_mode_default_params(
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em_size,
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self.device_pixel_ratio,
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dwrote::DWRITE_MEASURING_MODE_NATURAL,
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);
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let glyph_analysis = GlyphRunAnalysis::create(
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&glyph_run,
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self.device_pixel_ratio,
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None,
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rendering_mode,
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dwrote::DWRITE_MEASURING_MODE_NATURAL,
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0.0,
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0.0,
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)
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.map_err(Error::DirectWriteError)?;
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let bounds = glyph_analysis
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.get_alpha_texture_bounds(dwrote::DWRITE_TEXTURE_CLEARTYPE_3x1)
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.map_err(Error::DirectWriteError)?;
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let buf = glyph_analysis
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.create_alpha_texture(dwrote::DWRITE_TEXTURE_CLEARTYPE_3x1, bounds)
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.map_err(Error::DirectWriteError)?;
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Ok(RasterizedGlyph {
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c,
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width: (bounds.right - bounds.left) as i32,
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height: (bounds.bottom - bounds.top) as i32,
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top: -bounds.top,
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left: bounds.left,
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buf: BitmapBuffer::RGB(buf),
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})
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}
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fn get_loaded_font(&self, font_key: FontKey) -> Result<&Font, Error> {
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self.fonts.get(&font_key).ok_or(Error::FontNotLoaded)
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}
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fn get_glyph_index(&self, face: &FontFace, c: char) -> Result<u16, Error> {
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let idx = *face
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.get_glyph_indices(&[c as u32])
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.first()
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// DirectWrite returns 0 if the glyph does not exist in the font
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.filter(|glyph_index| **glyph_index != 0)
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.ok_or_else(|| Error::MissingGlyph(c))?;
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Ok(idx)
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}
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fn get_fallback_font(&self, loaded_font: &Font, c: char) -> Option<dwrote::Font> {
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let fallback = self.fallback_sequence.as_ref()?;
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let mut buf = [0u16; 2];
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c.encode_utf16(&mut buf);
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let length = c.len_utf16() as u32;
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let utf16_codepoints = &buf[..length as usize];
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let locale = get_current_locale();
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let text_analysis_source_data = TextAnalysisSourceData { locale: &locale, length };
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let text_analysis_source = TextAnalysisSource::from_text(
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Box::new(text_analysis_source_data),
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Cow::Borrowed(utf16_codepoints),
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);
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let fallback_result = fallback.map_characters(
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&text_analysis_source,
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0,
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length,
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&self.available_fonts,
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Some(&loaded_font.family_name),
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loaded_font.weight,
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loaded_font.style,
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loaded_font.stretch,
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);
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fallback_result.mapped_font
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}
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}
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impl crate::Rasterize for DirectWriteRasterizer {
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type Err = Error;
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fn new(device_pixel_ratio: f32, _: bool) -> Result<DirectWriteRasterizer, Error> {
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Ok(DirectWriteRasterizer { fonts: Vec::new(), device_pixel_ratio })
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Ok(DirectWriteRasterizer {
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fonts: HashMap::new(),
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keys: HashMap::new(),
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device_pixel_ratio,
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available_fonts: FontCollection::system(),
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fallback_sequence: FontFallback::get_system_fallback(),
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})
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}
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fn metrics(&self, key: FontKey, size: Size) -> Result<Metrics, Error> {
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let font = self.fonts.get(key.token as usize).ok_or(Error::FontNotLoaded)?;
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let face = &self.get_loaded_font(key)?.face;
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let vmetrics = face.metrics().metrics0();
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let vmetrics = font.metrics();
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let scale = (size.as_f32_pts() * self.device_pixel_ratio * (96.0 / 72.0))
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/ f32::from(vmetrics.designUnitsPerEm);
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let scale = em_size(size) * self.device_pixel_ratio / f32::from(vmetrics.designUnitsPerEm);
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let underline_position = f32::from(vmetrics.underlinePosition) * scale;
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let underline_thickness = f32::from(vmetrics.underlineThickness) * scale;
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@ -50,10 +184,12 @@ impl crate::Rasterize for DirectWriteRasterizer {
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let line_height = f64::from(ascent - descent + line_gap);
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// We assume that all monospace characters have the same width
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// Because of this we take '!', the first drawable character, for measurements
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let glyph_metrics = font.get_design_glyph_metrics(&[33], false);
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let hmetrics = glyph_metrics.first().ok_or(Error::MissingGlyph('!'))?;
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// Since all monospace characters have the same width, we use `!` for horizontal metrics
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let c = '!';
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let glyph_index = self.get_glyph_index(face, c)?;
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let glyph_metrics = face.get_design_glyph_metrics(&[glyph_index], false);
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let hmetrics = glyph_metrics.first().ok_or_else(|| Error::MissingGlyph(c))?;
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let average_advance = f64::from(hmetrics.advanceWidth) * f64::from(scale);
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@ -69,27 +205,22 @@ impl crate::Rasterize for DirectWriteRasterizer {
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}
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fn load_font(&mut self, desc: &FontDesc, _size: Size) -> Result<FontKey, Error> {
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let system_fc = FontCollection::system();
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// Fast path if face is already loaded
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if let Some(key) = self.keys.get(desc) {
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return Ok(*key);
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}
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let family = system_fc
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let family = self
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.available_fonts
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.get_font_family_by_name(&desc.name)
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.ok_or_else(|| Error::MissingFont(desc.clone()))?;
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let font = match desc.style {
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Style::Description { weight, slant } => {
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let weight =
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if weight == Weight::Bold { FontWeight::Bold } else { FontWeight::Regular };
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let style = match slant {
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Slant::Normal => FontStyle::Normal,
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Slant::Oblique => FontStyle::Oblique,
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Slant::Italic => FontStyle::Italic,
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};
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// This searches for the "best" font - should mean we don't have to worry about
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// fallbacks if our exact desired weight/style isn't available
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Ok(family.get_first_matching_font(weight, FontStretch::Normal, style))
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},
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Ok(family.get_first_matching_font(weight.into(), FontStretch::Normal, slant.into()))
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}
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Style::Specific(ref style) => {
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let mut idx = 0;
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let count = family.get_font_count();
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@ -107,73 +238,26 @@ impl crate::Rasterize for DirectWriteRasterizer {
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idx += 1;
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}
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},
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}
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}?;
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let face = font.create_font_face();
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self.fonts.push(face);
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let key = FontKey::next();
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self.keys.insert(desc.clone(), key);
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self.fonts.insert(key, font.into());
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Ok(FontKey { token: (self.fonts.len() - 1) as u32 })
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Ok(key)
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}
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fn get_glyph(&mut self, glyph: GlyphKey) -> Result<RasterizedGlyph, Error> {
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let font = self.fonts.get(glyph.font_key.token as usize).ok_or(Error::FontNotLoaded)?;
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let loaded_font = self.get_loaded_font(glyph.font_key)?;
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let offset = GlyphOffset { advanceOffset: 0.0, ascenderOffset: 0.0 };
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let glyph_index = *font
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.get_glyph_indices(&[glyph.c as u32])
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.first()
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.ok_or_else(|| Error::MissingGlyph(glyph.c))?;
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if glyph_index == 0 {
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// The DirectWrite documentation states that we should get 0 returned if the glyph
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// does not exist in the font
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return Err(Error::MissingGlyph(glyph.c));
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match self.rasterize_glyph(&loaded_font.face, glyph.size, glyph.c) {
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Err(err @ Error::MissingGlyph(_)) => {
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let fallback_font = self.get_fallback_font(&loaded_font, glyph.c).ok_or(err)?;
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self.rasterize_glyph(&fallback_font.create_font_face(), glyph.size, glyph.c)
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},
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result => result,
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}
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let glyph_run = dwrote::DWRITE_GLYPH_RUN {
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fontFace: unsafe { font.as_ptr() },
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fontEmSize: glyph.size.as_f32_pts(),
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glyphCount: 1,
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glyphIndices: &(glyph_index),
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glyphAdvances: &(0.0),
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glyphOffsets: &(offset),
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isSideways: 0,
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bidiLevel: 0,
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};
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let rendering_mode = font.get_recommended_rendering_mode_default_params(
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glyph.size.as_f32_pts(),
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self.device_pixel_ratio * (96.0 / 72.0),
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dwrote::DWRITE_MEASURING_MODE_NATURAL,
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);
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let glyph_analysis = GlyphRunAnalysis::create(
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&glyph_run,
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self.device_pixel_ratio * (96.0 / 72.0),
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None,
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rendering_mode,
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dwrote::DWRITE_MEASURING_MODE_NATURAL,
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0.0,
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0.0,
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)
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.or_else(|_| Err(Error::MissingGlyph(glyph.c)))?;
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let bounds = glyph_analysis
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.get_alpha_texture_bounds(dwrote::DWRITE_TEXTURE_CLEARTYPE_3x1)
|
||||
.or_else(|_| Err(Error::MissingGlyph(glyph.c)))?;
|
||||
let buf = glyph_analysis
|
||||
.create_alpha_texture(dwrote::DWRITE_TEXTURE_CLEARTYPE_3x1, bounds)
|
||||
.or_else(|_| Err(Error::MissingGlyph(glyph.c)))?;
|
||||
|
||||
Ok(RasterizedGlyph {
|
||||
c: glyph.c,
|
||||
width: (bounds.right - bounds.left) as i32,
|
||||
height: (bounds.bottom - bounds.top) as i32,
|
||||
top: -bounds.top,
|
||||
left: bounds.left,
|
||||
buf: BitmapBuffer::RGB(buf),
|
||||
})
|
||||
}
|
||||
|
||||
fn update_dpr(&mut self, device_pixel_ratio: f32) {
|
||||
|
|
@ -186,29 +270,84 @@ pub enum Error {
|
|||
MissingFont(FontDesc),
|
||||
MissingGlyph(char),
|
||||
FontNotLoaded,
|
||||
DirectWriteError(HRESULT),
|
||||
}
|
||||
|
||||
impl ::std::error::Error for Error {
|
||||
fn description(&self) -> &str {
|
||||
match *self {
|
||||
Error::MissingFont(ref _desc) => "Couldn't find the requested font",
|
||||
Error::MissingGlyph(ref _c) => "Couldn't find the requested glyph",
|
||||
Error::FontNotLoaded => "Tried to operate on font that hasn't been loaded",
|
||||
}
|
||||
}
|
||||
}
|
||||
impl std::error::Error for Error {}
|
||||
|
||||
impl ::std::fmt::Display for Error {
|
||||
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
|
||||
match *self {
|
||||
Error::MissingGlyph(ref c) => write!(f, "Glyph not found for char {:?}", c),
|
||||
Error::MissingFont(ref desc) => write!(
|
||||
impl Display for Error {
|
||||
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
|
||||
match self {
|
||||
Error::MissingGlyph(c) => write!(f, "Glyph not found for char {:?}", c),
|
||||
Error::MissingFont(desc) => write!(
|
||||
f,
|
||||
"Couldn't find a font with {}\n\tPlease check the font config in your \
|
||||
alacritty.yml.",
|
||||
desc
|
||||
),
|
||||
Error::FontNotLoaded => f.write_str("Tried to use a font that hasn't been loaded"),
|
||||
Error::DirectWriteError(hresult) => {
|
||||
write!(f, "A DirectWrite rendering error occurred: {:#X}", hresult)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn em_size(size: Size) -> f32 {
|
||||
size.as_f32_pts() * (96.0 / 72.0)
|
||||
}
|
||||
|
||||
impl From<dwrote::Font> for Font {
|
||||
fn from(font: dwrote::Font) -> Font {
|
||||
Font {
|
||||
face: font.create_font_face(),
|
||||
family_name: font.family_name(),
|
||||
weight: font.weight(),
|
||||
style: font.style(),
|
||||
stretch: font.stretch(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl From<Weight> for FontWeight {
|
||||
fn from(weight: Weight) -> FontWeight {
|
||||
match weight {
|
||||
Weight::Bold => FontWeight::Bold,
|
||||
Weight::Normal => FontWeight::Regular,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl From<Slant> for FontStyle {
|
||||
fn from(slant: Slant) -> FontStyle {
|
||||
match slant {
|
||||
Slant::Oblique => FontStyle::Oblique,
|
||||
Slant::Italic => FontStyle::Italic,
|
||||
Slant::Normal => FontStyle::Normal,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn get_current_locale() -> String {
|
||||
let mut buf = vec![0u16; LOCALE_NAME_MAX_LENGTH];
|
||||
let len = unsafe { GetUserDefaultLocaleName(buf.as_mut_ptr(), buf.len() as i32) as usize };
|
||||
|
||||
// `len` includes null byte, which we don't need in Rust
|
||||
OsString::from_wide(&buf[..len - 1]).into_string().expect("Locale not valid unicode")
|
||||
}
|
||||
|
||||
/// Font fallback information for dwrote's TextAnalysisSource.
|
||||
struct TextAnalysisSourceData<'a> {
|
||||
locale: &'a str,
|
||||
length: u32,
|
||||
}
|
||||
|
||||
impl TextAnalysisSourceMethods for TextAnalysisSourceData<'_> {
|
||||
fn get_locale_name(&self, _text_position: u32) -> (Cow<str>, u32) {
|
||||
(Cow::Borrowed(self.locale), self.length)
|
||||
}
|
||||
|
||||
fn get_paragraph_reading_direction(&self) -> dwrite::DWRITE_READING_DIRECTION {
|
||||
dwrite::DWRITE_READING_DIRECTION_LEFT_TO_RIGHT
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue