779 lines
27 KiB
Rust
779 lines
27 KiB
Rust
use crate::{
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point, px, size, Bounds, DevicePixels, Font, FontFeatures, FontId, FontMetrics, FontRun,
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FontStyle, FontWeight, GlyphId, LineLayout, Pixels, PlatformTextSystem, Point,
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RenderGlyphParams, Result, ShapedGlyph, ShapedRun, SharedString, Size, SUBPIXEL_VARIANTS,
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};
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use anyhow::anyhow;
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use cocoa::appkit::{CGFloat, CGPoint};
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use collections::{BTreeSet, HashMap};
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use core_foundation::{
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array::CFIndex,
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attributed_string::{CFAttributedStringRef, CFMutableAttributedString},
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base::{CFRange, TCFType},
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number::CFNumber,
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string::CFString,
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};
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use core_graphics::{
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base::{kCGImageAlphaPremultipliedLast, CGGlyph},
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color_space::CGColorSpace,
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context::CGContext,
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};
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use core_text::{
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font::CTFont,
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font_descriptor::{
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kCTFontSlantTrait, kCTFontSymbolicTrait, kCTFontWeightTrait, kCTFontWidthTrait,
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},
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line::CTLine,
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string_attributes::kCTFontAttributeName,
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};
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use font_kit::{
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font::Font as FontKitFont,
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handle::Handle,
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hinting::HintingOptions,
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metrics::Metrics,
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properties::{Style as FontkitStyle, Weight as FontkitWeight},
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source::SystemSource,
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sources::mem::MemSource,
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};
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use parking_lot::{RwLock, RwLockUpgradableReadGuard};
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use pathfinder_geometry::{
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rect::{RectF, RectI},
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transform2d::Transform2F,
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vector::{Vector2F, Vector2I},
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};
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use smallvec::SmallVec;
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use std::{borrow::Cow, char, cmp, convert::TryFrom, ffi::c_void, sync::Arc};
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use super::open_type;
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#[allow(non_upper_case_globals)]
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const kCGImageAlphaOnly: u32 = 7;
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pub(crate) struct MacTextSystem(RwLock<MacTextSystemState>);
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#[derive(Clone, PartialEq, Eq, Hash)]
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struct FontKey {
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font_family: SharedString,
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font_features: FontFeatures,
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}
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struct MacTextSystemState {
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memory_source: MemSource,
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system_source: SystemSource,
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fonts: Vec<FontKitFont>,
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font_selections: HashMap<Font, FontId>,
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font_ids_by_postscript_name: HashMap<String, FontId>,
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font_ids_by_font_key: HashMap<FontKey, SmallVec<[FontId; 4]>>,
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postscript_names_by_font_id: HashMap<FontId, String>,
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}
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impl MacTextSystem {
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pub(crate) fn new() -> Self {
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Self(RwLock::new(MacTextSystemState {
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memory_source: MemSource::empty(),
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system_source: SystemSource::new(),
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fonts: Vec::new(),
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font_selections: HashMap::default(),
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font_ids_by_postscript_name: HashMap::default(),
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font_ids_by_font_key: HashMap::default(),
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postscript_names_by_font_id: HashMap::default(),
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}))
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}
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}
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impl Default for MacTextSystem {
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fn default() -> Self {
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Self::new()
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}
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}
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impl PlatformTextSystem for MacTextSystem {
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fn add_fonts(&self, fonts: Vec<Cow<'static, [u8]>>) -> Result<()> {
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self.0.write().add_fonts(fonts)
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}
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fn all_font_names(&self) -> Vec<String> {
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let collection = core_text::font_collection::create_for_all_families();
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let Some(descriptors) = collection.get_descriptors() else {
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return Vec::new();
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};
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let mut names = BTreeSet::new();
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for descriptor in descriptors.into_iter() {
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names.extend(lenient_font_attributes::family_name(&descriptor));
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}
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if let Ok(fonts_in_memory) = self.0.read().memory_source.all_families() {
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names.extend(fonts_in_memory);
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}
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names.into_iter().collect()
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}
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fn all_font_families(&self) -> Vec<String> {
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self.0
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.read()
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.system_source
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.all_families()
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.expect("core text should never return an error")
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}
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fn font_id(&self, font: &Font) -> Result<FontId> {
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let lock = self.0.upgradable_read();
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if let Some(font_id) = lock.font_selections.get(font) {
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Ok(*font_id)
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} else {
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let mut lock = RwLockUpgradableReadGuard::upgrade(lock);
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let font_key = FontKey {
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font_family: font.family.clone(),
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font_features: font.features,
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};
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let candidates = if let Some(font_ids) = lock.font_ids_by_font_key.get(&font_key) {
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font_ids.as_slice()
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} else {
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let font_ids = lock.load_family(&font.family, font.features)?;
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lock.font_ids_by_font_key.insert(font_key.clone(), font_ids);
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lock.font_ids_by_font_key[&font_key].as_ref()
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};
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let candidate_properties = candidates
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.iter()
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.map(|font_id| lock.fonts[font_id.0].properties())
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.collect::<SmallVec<[_; 4]>>();
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let ix = font_kit::matching::find_best_match(
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&candidate_properties,
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&font_kit::properties::Properties {
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style: font.style.into(),
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weight: font.weight.into(),
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stretch: Default::default(),
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},
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)?;
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let font_id = candidates[ix];
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lock.font_selections.insert(font.clone(), font_id);
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Ok(font_id)
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}
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}
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fn font_metrics(&self, font_id: FontId) -> FontMetrics {
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self.0.read().fonts[font_id.0].metrics().into()
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}
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fn typographic_bounds(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Bounds<f32>> {
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Ok(self.0.read().fonts[font_id.0]
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.typographic_bounds(glyph_id.0)?
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.into())
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}
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fn advance(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Size<f32>> {
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self.0.read().advance(font_id, glyph_id)
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}
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fn glyph_for_char(&self, font_id: FontId, ch: char) -> Option<GlyphId> {
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self.0.read().glyph_for_char(font_id, ch)
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}
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fn glyph_raster_bounds(&self, params: &RenderGlyphParams) -> Result<Bounds<DevicePixels>> {
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self.0.read().raster_bounds(params)
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}
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fn rasterize_glyph(
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&self,
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glyph_id: &RenderGlyphParams,
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raster_bounds: Bounds<DevicePixels>,
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) -> Result<(Size<DevicePixels>, Vec<u8>)> {
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self.0.read().rasterize_glyph(glyph_id, raster_bounds)
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}
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fn layout_line(&self, text: &str, font_size: Pixels, font_runs: &[FontRun]) -> LineLayout {
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self.0.write().layout_line(text, font_size, font_runs)
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}
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fn wrap_line(
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&self,
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text: &str,
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font_id: FontId,
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font_size: Pixels,
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width: Pixels,
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) -> Vec<usize> {
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self.0.read().wrap_line(text, font_id, font_size, width)
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}
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}
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impl MacTextSystemState {
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fn add_fonts(&mut self, fonts: Vec<Cow<'static, [u8]>>) -> Result<()> {
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let fonts = fonts
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.into_iter()
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.map(|bytes| match bytes {
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Cow::Borrowed(embedded_font) => {
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let data_provider = unsafe {
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core_graphics::data_provider::CGDataProvider::from_slice(embedded_font)
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};
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let font = core_graphics::font::CGFont::from_data_provider(data_provider)
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.map_err(|_| anyhow!("Could not load an embedded font."))?;
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let font = font_kit::loaders::core_text::Font::from_core_graphics_font(font);
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Ok(Handle::from_native(&font))
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}
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Cow::Owned(bytes) => Ok(Handle::from_memory(Arc::new(bytes), 0)),
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})
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.collect::<Result<Vec<_>>>()?;
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self.memory_source.add_fonts(fonts.into_iter())?;
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Ok(())
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}
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fn load_family(
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&mut self,
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name: &SharedString,
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features: FontFeatures,
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) -> Result<SmallVec<[FontId; 4]>> {
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let mut font_ids = SmallVec::new();
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let family = self
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.memory_source
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.select_family_by_name(name.as_ref())
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.or_else(|_| self.system_source.select_family_by_name(name.as_ref()))?;
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for font in family.fonts() {
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let mut font = font.load()?;
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open_type::apply_features(&mut font, features);
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// This block contains a precautionary fix to guard against loading fonts
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// that might cause panics due to `.unwrap()`s up the chain.
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{
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// We use the 'm' character for text measurements in various spots
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// (e.g., the editor). However, at time of writing some of those usages
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// will panic if the font has no 'm' glyph.
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//
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// Therefore, we check up front that the font has the necessary glyph.
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let has_m_glyph = font.glyph_for_char('m').is_some();
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// HACK: The 'Segoe Fluent Icons' font does not have an 'm' glyph,
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// but we need to be able to load it for rendering Windows icons in
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// the Storybook (on macOS).
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let is_segoe_fluent_icons = font.full_name() == "Segoe Fluent Icons";
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if !has_m_glyph && !is_segoe_fluent_icons {
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// I spent far too long trying to track down why a font missing the 'm'
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// character wasn't loading. This log statement will hopefully save
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// someone else from suffering the same fate.
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log::warn!(
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"font '{}' has no 'm' character and was not loaded",
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font.full_name()
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);
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continue;
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}
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}
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// We've seen a number of panics in production caused by calling font.properties()
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// which unwraps a downcast to CFNumber. This is an attempt to avoid the panic,
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// and to try and identify the incalcitrant font.
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let traits = font.native_font().all_traits();
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if unsafe {
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!(traits
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.get(kCTFontSymbolicTrait)
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.downcast::<CFNumber>()
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.is_some()
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&& traits
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.get(kCTFontWidthTrait)
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.downcast::<CFNumber>()
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.is_some()
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&& traits
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.get(kCTFontWeightTrait)
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.downcast::<CFNumber>()
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.is_some()
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&& traits
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.get(kCTFontSlantTrait)
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.downcast::<CFNumber>()
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.is_some())
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} {
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log::error!(
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"Failed to read traits for font {:?}",
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font.postscript_name().unwrap()
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);
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continue;
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}
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let font_id = FontId(self.fonts.len());
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font_ids.push(font_id);
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let postscript_name = font.postscript_name().unwrap();
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self.font_ids_by_postscript_name
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.insert(postscript_name.clone(), font_id);
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self.postscript_names_by_font_id
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.insert(font_id, postscript_name);
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self.fonts.push(font);
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}
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Ok(font_ids)
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}
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fn advance(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Size<f32>> {
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Ok(self.fonts[font_id.0].advance(glyph_id.0)?.into())
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}
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fn glyph_for_char(&self, font_id: FontId, ch: char) -> Option<GlyphId> {
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self.fonts[font_id.0].glyph_for_char(ch).map(GlyphId)
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}
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fn id_for_native_font(&mut self, requested_font: CTFont) -> FontId {
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let postscript_name = requested_font.postscript_name();
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if let Some(font_id) = self.font_ids_by_postscript_name.get(&postscript_name) {
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*font_id
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} else {
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let font_id = FontId(self.fonts.len());
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self.font_ids_by_postscript_name
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.insert(postscript_name.clone(), font_id);
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self.postscript_names_by_font_id
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.insert(font_id, postscript_name);
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self.fonts
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.push(font_kit::font::Font::from_core_graphics_font(
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requested_font.copy_to_CGFont(),
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));
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font_id
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}
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}
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fn is_emoji(&self, font_id: FontId) -> bool {
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self.postscript_names_by_font_id
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.get(&font_id)
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.map_or(false, |postscript_name| {
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postscript_name == "AppleColorEmoji"
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})
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}
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fn raster_bounds(&self, params: &RenderGlyphParams) -> Result<Bounds<DevicePixels>> {
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let font = &self.fonts[params.font_id.0];
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let scale = Transform2F::from_scale(params.scale_factor);
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Ok(font
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.raster_bounds(
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params.glyph_id.0,
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params.font_size.into(),
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scale,
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HintingOptions::None,
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font_kit::canvas::RasterizationOptions::GrayscaleAa,
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)?
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.into())
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}
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fn rasterize_glyph(
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&self,
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params: &RenderGlyphParams,
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glyph_bounds: Bounds<DevicePixels>,
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) -> Result<(Size<DevicePixels>, Vec<u8>)> {
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if glyph_bounds.size.width.0 == 0 || glyph_bounds.size.height.0 == 0 {
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Err(anyhow!("glyph bounds are empty"))
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} else {
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// Add an extra pixel when the subpixel variant isn't zero to make room for anti-aliasing.
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let mut bitmap_size = glyph_bounds.size;
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if params.subpixel_variant.x > 0 {
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bitmap_size.width += DevicePixels(1);
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}
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if params.subpixel_variant.y > 0 {
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bitmap_size.height += DevicePixels(1);
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}
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let bitmap_size = bitmap_size;
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let mut bytes;
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let cx;
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if params.is_emoji {
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bytes = vec![0; bitmap_size.width.0 as usize * 4 * bitmap_size.height.0 as usize];
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cx = CGContext::create_bitmap_context(
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Some(bytes.as_mut_ptr() as *mut _),
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bitmap_size.width.0 as usize,
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bitmap_size.height.0 as usize,
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8,
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bitmap_size.width.0 as usize * 4,
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&CGColorSpace::create_device_rgb(),
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kCGImageAlphaPremultipliedLast,
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);
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} else {
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bytes = vec![0; bitmap_size.width.0 as usize * bitmap_size.height.0 as usize];
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cx = CGContext::create_bitmap_context(
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Some(bytes.as_mut_ptr() as *mut _),
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bitmap_size.width.0 as usize,
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bitmap_size.height.0 as usize,
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8,
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bitmap_size.width.0 as usize,
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&CGColorSpace::create_device_gray(),
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kCGImageAlphaOnly,
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);
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}
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// Move the origin to bottom left and account for scaling, this
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// makes drawing text consistent with the font-kit's raster_bounds.
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cx.translate(
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-glyph_bounds.origin.x.0 as CGFloat,
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(glyph_bounds.origin.y.0 + glyph_bounds.size.height.0) as CGFloat,
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);
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cx.scale(
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params.scale_factor as CGFloat,
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params.scale_factor as CGFloat,
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);
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let subpixel_shift = params
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.subpixel_variant
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.map(|v| v as f32 / SUBPIXEL_VARIANTS as f32);
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cx.set_allows_font_subpixel_positioning(true);
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cx.set_should_subpixel_position_fonts(true);
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cx.set_allows_font_subpixel_quantization(false);
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cx.set_should_subpixel_quantize_fonts(false);
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self.fonts[params.font_id.0]
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.native_font()
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.clone_with_font_size(f32::from(params.font_size) as CGFloat)
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.draw_glyphs(
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&[params.glyph_id.0 as CGGlyph],
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&[CGPoint::new(
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(subpixel_shift.x / params.scale_factor) as CGFloat,
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(subpixel_shift.y / params.scale_factor) as CGFloat,
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)],
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cx,
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);
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if params.is_emoji {
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// Convert from RGBA with premultiplied alpha to BGRA with straight alpha.
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for pixel in bytes.chunks_exact_mut(4) {
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pixel.swap(0, 2);
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let a = pixel[3] as f32 / 255.;
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pixel[0] = (pixel[0] as f32 / a) as u8;
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pixel[1] = (pixel[1] as f32 / a) as u8;
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pixel[2] = (pixel[2] as f32 / a) as u8;
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}
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}
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Ok((bitmap_size, bytes))
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}
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}
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fn layout_line(&mut self, text: &str, font_size: Pixels, font_runs: &[FontRun]) -> LineLayout {
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// Construct the attributed string, converting UTF8 ranges to UTF16 ranges.
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let mut string = CFMutableAttributedString::new();
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{
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string.replace_str(&CFString::new(text), CFRange::init(0, 0));
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let utf16_line_len = string.char_len() as usize;
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let mut ix_converter = StringIndexConverter::new(text);
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for run in font_runs {
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let utf8_end = ix_converter.utf8_ix + run.len;
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let utf16_start = ix_converter.utf16_ix;
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if utf16_start >= utf16_line_len {
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break;
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}
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ix_converter.advance_to_utf8_ix(utf8_end);
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let utf16_end = cmp::min(ix_converter.utf16_ix, utf16_line_len);
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let cf_range =
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CFRange::init(utf16_start as isize, (utf16_end - utf16_start) as isize);
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let font: &FontKitFont = &self.fonts[run.font_id.0];
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unsafe {
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string.set_attribute(
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cf_range,
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kCTFontAttributeName,
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&font.native_font().clone_with_font_size(font_size.into()),
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);
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}
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if utf16_end == utf16_line_len {
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break;
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}
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}
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}
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// Retrieve the glyphs from the shaped line, converting UTF16 offsets to UTF8 offsets.
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let line = CTLine::new_with_attributed_string(string.as_concrete_TypeRef());
|
||
|
||
let mut runs = Vec::new();
|
||
for run in line.glyph_runs().into_iter() {
|
||
let attributes = run.attributes().unwrap();
|
||
let font = unsafe {
|
||
attributes
|
||
.get(kCTFontAttributeName)
|
||
.downcast::<CTFont>()
|
||
.unwrap()
|
||
};
|
||
let font_id = self.id_for_native_font(font);
|
||
|
||
let mut ix_converter = StringIndexConverter::new(text);
|
||
let mut glyphs = SmallVec::new();
|
||
for ((glyph_id, position), glyph_utf16_ix) in run
|
||
.glyphs()
|
||
.iter()
|
||
.zip(run.positions().iter())
|
||
.zip(run.string_indices().iter())
|
||
{
|
||
let glyph_utf16_ix = usize::try_from(*glyph_utf16_ix).unwrap();
|
||
ix_converter.advance_to_utf16_ix(glyph_utf16_ix);
|
||
glyphs.push(ShapedGlyph {
|
||
id: GlyphId(*glyph_id as u32),
|
||
position: point(position.x as f32, position.y as f32).map(px),
|
||
index: ix_converter.utf8_ix,
|
||
is_emoji: self.is_emoji(font_id),
|
||
});
|
||
}
|
||
|
||
runs.push(ShapedRun { font_id, glyphs })
|
||
}
|
||
|
||
let typographic_bounds = line.get_typographic_bounds();
|
||
LineLayout {
|
||
runs,
|
||
font_size,
|
||
width: typographic_bounds.width.into(),
|
||
ascent: typographic_bounds.ascent.into(),
|
||
descent: typographic_bounds.descent.into(),
|
||
len: text.len(),
|
||
}
|
||
}
|
||
|
||
fn wrap_line(
|
||
&self,
|
||
text: &str,
|
||
font_id: FontId,
|
||
font_size: Pixels,
|
||
width: Pixels,
|
||
) -> Vec<usize> {
|
||
let mut string = CFMutableAttributedString::new();
|
||
string.replace_str(&CFString::new(text), CFRange::init(0, 0));
|
||
let cf_range = CFRange::init(0, text.encode_utf16().count() as isize);
|
||
let font = &self.fonts[font_id.0];
|
||
unsafe {
|
||
string.set_attribute(
|
||
cf_range,
|
||
kCTFontAttributeName,
|
||
&font.native_font().clone_with_font_size(font_size.into()),
|
||
);
|
||
|
||
let typesetter = CTTypesetterCreateWithAttributedString(string.as_concrete_TypeRef());
|
||
let mut ix_converter = StringIndexConverter::new(text);
|
||
let mut break_indices = Vec::new();
|
||
while ix_converter.utf8_ix < text.len() {
|
||
let utf16_len = CTTypesetterSuggestLineBreak(
|
||
typesetter,
|
||
ix_converter.utf16_ix as isize,
|
||
width.into(),
|
||
) as usize;
|
||
ix_converter.advance_to_utf16_ix(ix_converter.utf16_ix + utf16_len);
|
||
if ix_converter.utf8_ix >= text.len() {
|
||
break;
|
||
}
|
||
break_indices.push(ix_converter.utf8_ix);
|
||
}
|
||
break_indices
|
||
}
|
||
}
|
||
}
|
||
|
||
#[derive(Clone)]
|
||
struct StringIndexConverter<'a> {
|
||
text: &'a str,
|
||
utf8_ix: usize,
|
||
utf16_ix: usize,
|
||
}
|
||
|
||
impl<'a> StringIndexConverter<'a> {
|
||
fn new(text: &'a str) -> Self {
|
||
Self {
|
||
text,
|
||
utf8_ix: 0,
|
||
utf16_ix: 0,
|
||
}
|
||
}
|
||
|
||
fn advance_to_utf8_ix(&mut self, utf8_target: usize) {
|
||
for (ix, c) in self.text[self.utf8_ix..].char_indices() {
|
||
if self.utf8_ix + ix >= utf8_target {
|
||
self.utf8_ix += ix;
|
||
return;
|
||
}
|
||
self.utf16_ix += c.len_utf16();
|
||
}
|
||
self.utf8_ix = self.text.len();
|
||
}
|
||
|
||
fn advance_to_utf16_ix(&mut self, utf16_target: usize) {
|
||
for (ix, c) in self.text[self.utf8_ix..].char_indices() {
|
||
if self.utf16_ix >= utf16_target {
|
||
self.utf8_ix += ix;
|
||
return;
|
||
}
|
||
self.utf16_ix += c.len_utf16();
|
||
}
|
||
self.utf8_ix = self.text.len();
|
||
}
|
||
}
|
||
|
||
#[repr(C)]
|
||
pub(crate) struct __CFTypesetter(c_void);
|
||
|
||
type CTTypesetterRef = *const __CFTypesetter;
|
||
|
||
#[link(name = "CoreText", kind = "framework")]
|
||
extern "C" {
|
||
fn CTTypesetterCreateWithAttributedString(string: CFAttributedStringRef) -> CTTypesetterRef;
|
||
|
||
fn CTTypesetterSuggestLineBreak(
|
||
typesetter: CTTypesetterRef,
|
||
start_index: CFIndex,
|
||
width: f64,
|
||
) -> CFIndex;
|
||
}
|
||
|
||
impl From<Metrics> for FontMetrics {
|
||
fn from(metrics: Metrics) -> Self {
|
||
FontMetrics {
|
||
units_per_em: metrics.units_per_em,
|
||
ascent: metrics.ascent,
|
||
descent: metrics.descent,
|
||
line_gap: metrics.line_gap,
|
||
underline_position: metrics.underline_position,
|
||
underline_thickness: metrics.underline_thickness,
|
||
cap_height: metrics.cap_height,
|
||
x_height: metrics.x_height,
|
||
bounding_box: metrics.bounding_box.into(),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl From<RectF> for Bounds<f32> {
|
||
fn from(rect: RectF) -> Self {
|
||
Bounds {
|
||
origin: point(rect.origin_x(), rect.origin_y()),
|
||
size: size(rect.width(), rect.height()),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl From<RectI> for Bounds<DevicePixels> {
|
||
fn from(rect: RectI) -> Self {
|
||
Bounds {
|
||
origin: point(DevicePixels(rect.origin_x()), DevicePixels(rect.origin_y())),
|
||
size: size(DevicePixels(rect.width()), DevicePixels(rect.height())),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl From<Vector2I> for Size<DevicePixels> {
|
||
fn from(value: Vector2I) -> Self {
|
||
size(value.x().into(), value.y().into())
|
||
}
|
||
}
|
||
|
||
impl From<RectI> for Bounds<i32> {
|
||
fn from(rect: RectI) -> Self {
|
||
Bounds {
|
||
origin: point(rect.origin_x(), rect.origin_y()),
|
||
size: size(rect.width(), rect.height()),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl From<Point<u32>> for Vector2I {
|
||
fn from(size: Point<u32>) -> Self {
|
||
Vector2I::new(size.x as i32, size.y as i32)
|
||
}
|
||
}
|
||
|
||
impl From<Vector2F> for Size<f32> {
|
||
fn from(vec: Vector2F) -> Self {
|
||
size(vec.x(), vec.y())
|
||
}
|
||
}
|
||
|
||
impl From<FontWeight> for FontkitWeight {
|
||
fn from(value: FontWeight) -> Self {
|
||
FontkitWeight(value.0)
|
||
}
|
||
}
|
||
|
||
impl From<FontStyle> for FontkitStyle {
|
||
fn from(style: FontStyle) -> Self {
|
||
match style {
|
||
FontStyle::Normal => FontkitStyle::Normal,
|
||
FontStyle::Italic => FontkitStyle::Italic,
|
||
FontStyle::Oblique => FontkitStyle::Oblique,
|
||
}
|
||
}
|
||
}
|
||
|
||
// Some fonts may have no attributest despite `core_text` requiring them (and panicking).
|
||
// This is the same version as `core_text` has without `expect` calls.
|
||
mod lenient_font_attributes {
|
||
use core_foundation::{
|
||
base::{CFRetain, CFType, TCFType},
|
||
string::{CFString, CFStringRef},
|
||
};
|
||
use core_text::font_descriptor::{
|
||
kCTFontFamilyNameAttribute, CTFontDescriptor, CTFontDescriptorCopyAttribute,
|
||
};
|
||
|
||
pub fn family_name(descriptor: &CTFontDescriptor) -> Option<String> {
|
||
unsafe { get_string_attribute(descriptor, kCTFontFamilyNameAttribute) }
|
||
}
|
||
|
||
fn get_string_attribute(
|
||
descriptor: &CTFontDescriptor,
|
||
attribute: CFStringRef,
|
||
) -> Option<String> {
|
||
unsafe {
|
||
let value = CTFontDescriptorCopyAttribute(descriptor.as_concrete_TypeRef(), attribute);
|
||
if value.is_null() {
|
||
return None;
|
||
}
|
||
|
||
let value = CFType::wrap_under_create_rule(value);
|
||
assert!(value.instance_of::<CFString>());
|
||
let s = wrap_under_get_rule(value.as_CFTypeRef() as CFStringRef);
|
||
Some(s.to_string())
|
||
}
|
||
}
|
||
|
||
unsafe fn wrap_under_get_rule(reference: CFStringRef) -> CFString {
|
||
assert!(!reference.is_null(), "Attempted to create a NULL object.");
|
||
let reference = CFRetain(reference as *const ::std::os::raw::c_void) as CFStringRef;
|
||
TCFType::wrap_under_create_rule(reference)
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod tests {
|
||
use crate::{font, px, FontRun, GlyphId, MacTextSystem, PlatformTextSystem};
|
||
|
||
#[test]
|
||
fn test_wrap_line() {
|
||
let fonts = MacTextSystem::new();
|
||
let font_id = fonts.font_id(&font("Helvetica")).unwrap();
|
||
|
||
let line = "one two three four five\n";
|
||
let wrap_boundaries = fonts.wrap_line(line, font_id, px(16.), px(64.0));
|
||
assert_eq!(wrap_boundaries, &["one two ".len(), "one two three ".len()]);
|
||
|
||
let line = "aaa ααα ✋✋✋ 🎉🎉🎉\n";
|
||
let wrap_boundaries = fonts.wrap_line(line, font_id, px(16.), px(64.0));
|
||
assert_eq!(
|
||
wrap_boundaries,
|
||
&["aaa ααα ".len(), "aaa ααα ✋✋✋ ".len(),]
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_layout_line_bom_char() {
|
||
let fonts = MacTextSystem::new();
|
||
let font_id = fonts.font_id(&font("Helvetica")).unwrap();
|
||
let line = "\u{feff}";
|
||
let mut style = FontRun {
|
||
font_id,
|
||
len: line.len(),
|
||
};
|
||
|
||
let layout = fonts.layout_line(line, px(16.), &[style]);
|
||
assert_eq!(layout.len, line.len());
|
||
assert!(layout.runs.is_empty());
|
||
|
||
let line = "a\u{feff}b";
|
||
style.len = line.len();
|
||
let layout = fonts.layout_line(line, px(16.), &[style]);
|
||
assert_eq!(layout.len, line.len());
|
||
assert_eq!(layout.runs.len(), 1);
|
||
assert_eq!(layout.runs[0].glyphs.len(), 2);
|
||
assert_eq!(layout.runs[0].glyphs[0].id, GlyphId(68u32)); // a
|
||
// There's no glyph for \u{feff}
|
||
assert_eq!(layout.runs[0].glyphs[1].id, GlyphId(69u32)); // b
|
||
}
|
||
}
|