655 lines
23 KiB
Rust
655 lines
23 KiB
Rust
use crate::{
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fonts::{FontId, GlyphId, Metrics, Properties},
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geometry::{
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rect::{RectF, RectI},
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transform2d::Transform2F,
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vector::{vec2f, Vector2F},
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},
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platform::{self, RasterizationOptions},
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text_layout::{Glyph, LineLayout, Run, RunStyle},
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};
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use cocoa::appkit::{CGFloat, CGPoint};
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use collections::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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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::{font::CTFont, line::CTLine, string_attributes::kCTFontAttributeName};
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use font_kit::{
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handle::Handle, hinting::HintingOptions, source::SystemSource, sources::mem::MemSource,
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};
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use parking_lot::RwLock;
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use std::{cell::RefCell, char, cmp, convert::TryFrom, ffi::c_void, sync::Arc};
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#[allow(non_upper_case_globals)]
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const kCGImageAlphaOnly: u32 = 7;
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pub struct FontSystem(RwLock<FontSystemState>);
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struct FontSystemState {
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memory_source: MemSource,
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system_source: SystemSource,
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fonts: Vec<font_kit::font::Font>,
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font_ids_by_postscript_name: HashMap<String, FontId>,
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postscript_names_by_font_id: HashMap<FontId, String>,
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}
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impl FontSystem {
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pub fn new() -> Self {
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Self(RwLock::new(FontSystemState {
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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_ids_by_postscript_name: Default::default(),
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postscript_names_by_font_id: Default::default(),
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}))
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}
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}
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impl platform::FontSystem for FontSystem {
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fn add_fonts(&self, fonts: &[Arc<Vec<u8>>]) -> anyhow::Result<()> {
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self.0.write().add_fonts(fonts)
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}
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fn load_family(&self, name: &str) -> anyhow::Result<Vec<FontId>> {
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self.0.write().load_family(name)
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}
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fn select_font(&self, font_ids: &[FontId], properties: &Properties) -> anyhow::Result<FontId> {
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self.0.read().select_font(font_ids, properties)
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}
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fn font_metrics(&self, font_id: FontId) -> Metrics {
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self.0.read().font_metrics(font_id)
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}
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fn typographic_bounds(&self, font_id: FontId, glyph_id: GlyphId) -> anyhow::Result<RectF> {
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self.0.read().typographic_bounds(font_id, glyph_id)
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}
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fn advance(&self, font_id: FontId, glyph_id: GlyphId) -> anyhow::Result<Vector2F> {
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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 rasterize_glyph(
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&self,
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font_id: FontId,
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font_size: f32,
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glyph_id: GlyphId,
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subpixel_shift: Vector2F,
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scale_factor: f32,
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options: RasterizationOptions,
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) -> Option<(RectI, Vec<u8>)> {
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self.0.read().rasterize_glyph(
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font_id,
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font_size,
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glyph_id,
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subpixel_shift,
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scale_factor,
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options,
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)
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}
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fn layout_line(&self, text: &str, font_size: f32, runs: &[(usize, RunStyle)]) -> LineLayout {
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self.0.write().layout_line(text, font_size, runs)
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}
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fn wrap_line(&self, text: &str, font_id: FontId, font_size: f32, width: f32) -> 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 FontSystemState {
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fn add_fonts(&mut self, fonts: &[Arc<Vec<u8>>]) -> anyhow::Result<()> {
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self.memory_source.add_fonts(
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fonts
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.iter()
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.map(|bytes| Handle::from_memory(bytes.clone(), 0)),
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)?;
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Ok(())
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}
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fn load_family(&mut self, name: &str) -> anyhow::Result<Vec<FontId>> {
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let mut font_ids = Vec::new();
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let family = self
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.memory_source
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.select_family_by_name(name)
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.or_else(|_| self.system_source.select_family_by_name(name))?;
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for font in family.fonts() {
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let font = font.load()?;
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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 select_font(&self, font_ids: &[FontId], properties: &Properties) -> anyhow::Result<FontId> {
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let candidates = font_ids
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.iter()
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.map(|font_id| self.fonts[font_id.0].properties())
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.collect::<Vec<_>>();
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let idx = font_kit::matching::find_best_match(&candidates, properties)?;
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Ok(font_ids[idx])
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}
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fn font_metrics(&self, font_id: FontId) -> Metrics {
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self.fonts[font_id.0].metrics()
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}
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fn typographic_bounds(&self, font_id: FontId, glyph_id: GlyphId) -> anyhow::Result<RectF> {
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Ok(self.fonts[font_id.0].typographic_bounds(glyph_id)?)
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}
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fn advance(&self, font_id: FontId, glyph_id: GlyphId) -> anyhow::Result<Vector2F> {
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Ok(self.fonts[font_id.0].advance(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.fonts[font_id.0].glyph_for_char(ch)
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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 rasterize_glyph(
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&self,
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font_id: FontId,
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font_size: f32,
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glyph_id: GlyphId,
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subpixel_shift: Vector2F,
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scale_factor: f32,
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options: RasterizationOptions,
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) -> Option<(RectI, Vec<u8>)> {
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let font = &self.fonts[font_id.0];
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let scale = Transform2F::from_scale(scale_factor);
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let glyph_bounds = font
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.raster_bounds(
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glyph_id,
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font_size,
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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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.ok()?;
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if glyph_bounds.width() == 0 || glyph_bounds.height() == 0 {
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None
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} else {
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// Make room for subpixel variants.
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let subpixel_padding = subpixel_shift.ceil().to_i32();
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let cx_bounds = RectI::new(
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glyph_bounds.origin(),
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glyph_bounds.size() + subpixel_padding,
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);
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let mut bytes;
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let cx;
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match options {
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RasterizationOptions::Alpha => {
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bytes = vec![0; cx_bounds.width() as usize * cx_bounds.height() 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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cx_bounds.width() as usize,
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cx_bounds.height() as usize,
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8,
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cx_bounds.width() 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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RasterizationOptions::Bgra => {
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bytes = vec![0; cx_bounds.width() as usize * 4 * cx_bounds.height() 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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cx_bounds.width() as usize,
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cx_bounds.height() as usize,
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8,
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cx_bounds.width() as usize * 4,
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&CGColorSpace::create_device_rgb(),
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kCGImageAlphaPremultipliedLast,
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);
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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() as CGFloat,
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(glyph_bounds.origin_y() + glyph_bounds.height()) as CGFloat,
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);
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cx.scale(scale_factor as CGFloat, scale_factor as CGFloat);
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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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font.native_font()
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.clone_with_font_size(font_size as CGFloat)
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.draw_glyphs(
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&[glyph_id as CGGlyph],
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&[CGPoint::new(
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(subpixel_shift.x() / scale_factor) as CGFloat,
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(subpixel_shift.y() / scale_factor) as CGFloat,
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)],
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cx,
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);
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if let RasterizationOptions::Bgra = options {
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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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Some((cx_bounds, bytes))
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}
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}
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fn layout_line(
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&mut self,
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text: &str,
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font_size: f32,
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runs: &[(usize, RunStyle)],
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) -> 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 last_run: RefCell<Option<(usize, FontId)>> = Default::default();
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let font_runs = runs
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.iter()
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.filter_map(|(len, style)| {
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let mut last_run = last_run.borrow_mut();
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if let Some((last_len, last_font_id)) = last_run.as_mut() {
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if style.font_id == *last_font_id {
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*last_len += *len;
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None
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} else {
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let result = (*last_len, *last_font_id);
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*last_len = *len;
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*last_font_id = style.font_id;
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Some(result)
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}
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} else {
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*last_run = Some((*len, style.font_id));
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None
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}
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})
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.chain(std::iter::from_fn(|| last_run.borrow_mut().take()));
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let mut ix_converter = StringIndexConverter::new(text);
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for (run_len, font_id) 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 = &self.fonts[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 as f64),
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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());
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let mut runs = Vec::new();
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for run in line.glyph_runs().into_iter() {
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let attributes = run.attributes().unwrap();
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let font = unsafe {
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attributes
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.get(kCTFontAttributeName)
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.downcast::<CTFont>()
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.unwrap()
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};
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let font_id = self.id_for_native_font(font);
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let mut ix_converter = StringIndexConverter::new(text);
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let mut glyphs = Vec::new();
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for ((glyph_id, position), glyph_utf16_ix) in run
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.glyphs()
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.iter()
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.zip(run.positions().iter())
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.zip(run.string_indices().iter())
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{
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let glyph_utf16_ix = usize::try_from(*glyph_utf16_ix).unwrap();
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ix_converter.advance_to_utf16_ix(glyph_utf16_ix);
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glyphs.push(Glyph {
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id: *glyph_id as GlyphId,
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position: vec2f(position.x as f32, position.y as f32),
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index: ix_converter.utf8_ix,
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is_emoji: self.is_emoji(font_id),
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});
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}
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runs.push(Run { font_id, glyphs })
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}
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let typographic_bounds = line.get_typographic_bounds();
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LineLayout {
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width: typographic_bounds.width as f32,
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ascent: typographic_bounds.ascent as f32,
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descent: typographic_bounds.descent as f32,
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runs,
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font_size,
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len: text.len(),
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}
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}
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fn wrap_line(&self, text: &str, font_id: FontId, font_size: f32, width: f32) -> Vec<usize> {
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let mut string = CFMutableAttributedString::new();
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string.replace_str(&CFString::new(text), CFRange::init(0, 0));
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let cf_range = CFRange::init(0 as isize, text.encode_utf16().count() as isize);
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let font = &self.fonts[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 as f64),
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);
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let typesetter = CTTypesetterCreateWithAttributedString(string.as_concrete_TypeRef());
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let mut ix_converter = StringIndexConverter::new(text);
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let mut break_indices = Vec::new();
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while ix_converter.utf8_ix < text.len() {
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let utf16_len = CTTypesetterSuggestLineBreak(
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typesetter,
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ix_converter.utf16_ix as isize,
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width as f64,
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) as usize;
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ix_converter.advance_to_utf16_ix(ix_converter.utf16_ix + utf16_len);
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if ix_converter.utf8_ix >= text.len() {
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break;
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}
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break_indices.push(ix_converter.utf8_ix as usize);
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}
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break_indices
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}
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}
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}
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#[derive(Clone)]
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struct StringIndexConverter<'a> {
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text: &'a str,
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utf8_ix: usize,
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utf16_ix: usize,
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}
|
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impl<'a> StringIndexConverter<'a> {
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fn new(text: &'a str) -> Self {
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Self {
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text,
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utf8_ix: 0,
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utf16_ix: 0,
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}
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}
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fn advance_to_utf8_ix(&mut self, utf8_target: usize) {
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for (ix, c) in self.text[self.utf8_ix..].char_indices() {
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if self.utf8_ix + ix >= utf8_target {
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self.utf8_ix += ix;
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return;
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}
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self.utf16_ix += c.len_utf16();
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}
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self.utf8_ix = self.text.len();
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}
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fn advance_to_utf16_ix(&mut self, utf16_target: usize) {
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for (ix, c) in self.text[self.utf8_ix..].char_indices() {
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if self.utf16_ix >= utf16_target {
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self.utf8_ix += ix;
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return;
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}
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self.utf16_ix += c.len_utf16();
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}
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self.utf8_ix = self.text.len();
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}
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}
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#[repr(C)]
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pub struct __CFTypesetter(c_void);
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pub type CTTypesetterRef = *const __CFTypesetter;
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#[link(name = "CoreText", kind = "framework")]
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extern "C" {
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fn CTTypesetterCreateWithAttributedString(string: CFAttributedStringRef) -> CTTypesetterRef;
|
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|
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fn CTTypesetterSuggestLineBreak(
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typesetter: CTTypesetterRef,
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start_index: CFIndex,
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width: f64,
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) -> CFIndex;
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::MutableAppContext;
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use font_kit::properties::{Style, Weight};
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use platform::FontSystem as _;
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#[crate::test(self, retries = 5)]
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fn test_layout_str(_: &mut MutableAppContext) {
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// This is failing intermittently on CI and we don't have time to figure it out
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let fonts = FontSystem::new();
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let menlo = fonts.load_family("Menlo").unwrap();
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let menlo_regular = RunStyle {
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font_id: fonts.select_font(&menlo, &Properties::new()).unwrap(),
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color: Default::default(),
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underline: Default::default(),
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};
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let menlo_italic = RunStyle {
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font_id: fonts
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.select_font(&menlo, &Properties::new().style(Style::Italic))
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.unwrap(),
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color: Default::default(),
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underline: Default::default(),
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};
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let menlo_bold = RunStyle {
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font_id: fonts
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.select_font(&menlo, &Properties::new().weight(Weight::BOLD))
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.unwrap(),
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color: Default::default(),
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underline: Default::default(),
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};
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assert_ne!(menlo_regular, menlo_italic);
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assert_ne!(menlo_regular, menlo_bold);
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assert_ne!(menlo_italic, menlo_bold);
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let line = fonts.layout_line(
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"hello world",
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16.0,
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&[(2, menlo_bold), (4, menlo_italic), (5, menlo_regular)],
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);
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assert_eq!(line.runs.len(), 3);
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assert_eq!(line.runs[0].font_id, menlo_bold.font_id);
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assert_eq!(line.runs[0].glyphs.len(), 2);
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assert_eq!(line.runs[1].font_id, menlo_italic.font_id);
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assert_eq!(line.runs[1].glyphs.len(), 4);
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assert_eq!(line.runs[2].font_id, menlo_regular.font_id);
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assert_eq!(line.runs[2].glyphs.len(), 5);
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}
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#[test]
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fn test_glyph_offsets() -> anyhow::Result<()> {
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let fonts = FontSystem::new();
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let zapfino = fonts.load_family("Zapfino")?;
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let zapfino_regular = RunStyle {
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font_id: fonts.select_font(&zapfino, &Properties::new())?,
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color: Default::default(),
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underline: Default::default(),
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};
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let menlo = fonts.load_family("Menlo")?;
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let menlo_regular = RunStyle {
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font_id: fonts.select_font(&menlo, &Properties::new())?,
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color: Default::default(),
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underline: Default::default(),
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};
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let text = "This is, m𐍈re 𐍈r less, Zapfino!𐍈";
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let line = fonts.layout_line(
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text,
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16.0,
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&[
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(9, zapfino_regular),
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(13, menlo_regular),
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(text.len() - 22, zapfino_regular),
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],
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);
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assert_eq!(
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line.runs
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.iter()
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.flat_map(|r| r.glyphs.iter())
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.map(|g| g.index)
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.collect::<Vec<_>>(),
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vec![0, 2, 4, 5, 7, 8, 9, 10, 14, 15, 16, 17, 21, 22, 23, 24, 26, 27, 28, 29, 36, 37],
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);
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Ok(())
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}
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#[test]
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#[ignore]
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fn test_rasterize_glyph() {
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use std::{fs::File, io::BufWriter, path::Path};
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let fonts = FontSystem::new();
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let font_ids = fonts.load_family("Fira Code").unwrap();
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let font_id = fonts.select_font(&font_ids, &Default::default()).unwrap();
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let glyph_id = fonts.glyph_for_char(font_id, 'G').unwrap();
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const VARIANTS: usize = 1;
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for i in 0..VARIANTS {
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let variant = i as f32 / VARIANTS as f32;
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let (bounds, bytes) = fonts
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.rasterize_glyph(
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font_id,
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16.0,
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glyph_id,
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vec2f(variant, variant),
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2.,
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RasterizationOptions::Alpha,
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)
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.unwrap();
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let name = format!("/Users/as-cii/Desktop/twog-{}.png", i);
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let path = Path::new(&name);
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let file = File::create(path).unwrap();
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let ref mut w = BufWriter::new(file);
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let mut encoder = png::Encoder::new(w, bounds.width() as u32, bounds.height() as u32);
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encoder.set_color(png::ColorType::Grayscale);
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encoder.set_depth(png::BitDepth::Eight);
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let mut writer = encoder.write_header().unwrap();
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writer.write_image_data(&bytes).unwrap();
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}
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}
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#[test]
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fn test_wrap_line() {
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let fonts = FontSystem::new();
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let font_ids = fonts.load_family("Helvetica").unwrap();
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let font_id = fonts.select_font(&font_ids, &Default::default()).unwrap();
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let line = "one two three four five\n";
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let wrap_boundaries = fonts.wrap_line(line, font_id, 16., 64.0);
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assert_eq!(wrap_boundaries, &["one two ".len(), "one two three ".len()]);
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let line = "aaa ααα ✋✋✋ 🎉🎉🎉\n";
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let wrap_boundaries = fonts.wrap_line(line, font_id, 16., 64.0);
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assert_eq!(
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wrap_boundaries,
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&["aaa ααα ".len(), "aaa ααα ✋✋✋ ".len(),]
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);
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}
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#[test]
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fn test_layout_line_bom_char() {
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let fonts = FontSystem::new();
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let font_ids = fonts.load_family("Helvetica").unwrap();
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let style = RunStyle {
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font_id: fonts.select_font(&font_ids, &Default::default()).unwrap(),
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color: Default::default(),
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underline: Default::default(),
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};
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let line = "\u{feff}";
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let layout = fonts.layout_line(line, 16., &[(line.len(), style)]);
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assert_eq!(layout.len, line.len());
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assert!(layout.runs.is_empty());
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let line = "a\u{feff}b";
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let layout = fonts.layout_line(line, 16., &[(line.len(), style)]);
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assert_eq!(layout.len, line.len());
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assert_eq!(layout.runs.len(), 1);
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assert_eq!(layout.runs[0].glyphs.len(), 2);
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assert_eq!(layout.runs[0].glyphs[0].id, 68); // a
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// There's no glyph for \u{feff}
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assert_eq!(layout.runs[0].glyphs[1].id, 69); // b
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}
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}
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