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Approximate cubic curves with quadratics in the Core Graphics backend

This commit is contained in:
Patrick Walton 2017-10-23 20:28:45 -07:00
parent 0a4fcb4841
commit 1c693d5029
1 changed files with 18 additions and 9 deletions
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27
font-renderer/src/core_graphics.rs
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@ -16,12 +16,15 @@ use core_graphics_sys::path::{CGPath, CGPathElementType};
use core_text::font::CTFont;
use core_text;
use euclid::{Point2D, Size2D};
use pathfinder_path_utils::cubic::{CubicPathCommand, CubicPathCommandApproxStream};
use pathfinder_path_utils::PathCommand;
use std::collections::BTreeMap;
use std::collections::btree_map::Entry;
use std::sync::Arc;
use {FontInstanceKey, FontKey, GlyphDimensions, GlyphKey};
const CURVE_APPROX_ERROR_BOUND: f32 = 0.1;
pub struct FontContext {
core_graphics_fonts: BTreeMap<FontKey, CGFont>,
core_text_fonts: BTreeMap<FontInstanceKey, CTFont>,
@ -105,7 +108,6 @@ impl FontContext {
pub fn glyph_outline(&mut self, font_instance: &FontInstanceKey, glyph_key: &GlyphKey)
-> Result<GlyphOutline, ()> {
//println!("GlyphOutline({:?})", font_instance);
let core_text_font = try!(self.ensure_core_text_font(font_instance));
let path = try!(core_text_font.create_path_for_glyph(glyph_key.glyph_index as CGGlyph,
&CG_AFFINE_TRANSFORM_IDENTITY));
@ -145,24 +147,31 @@ impl GlyphOutline {
let points = element.points();
commands.push(match element.element_type {
CGPathElementType::MoveToPoint => {
PathCommand::MoveTo(convert_point(&points[0]))
CubicPathCommand::MoveTo(convert_point(&points[0]))
}
CGPathElementType::AddLineToPoint => {
PathCommand::LineTo(convert_point(&points[0]))
CubicPathCommand::LineTo(convert_point(&points[0]))
}
CGPathElementType::AddQuadCurveToPoint => {
PathCommand::CurveTo(convert_point(&points[0]), convert_point(&points[1]))
CubicPathCommand::QuadCurveTo(convert_point(&points[0]),
convert_point(&points[1]))
}
CGPathElementType::AddCurveToPoint => {
// FIXME(pcwalton)
PathCommand::CurveTo(convert_point(&points[0]), convert_point(&points[2]))
CubicPathCommand::CubicCurveTo(convert_point(&points[0]),
convert_point(&points[1]),
convert_point(&points[2]))
}
CGPathElementType::CloseSubpath => PathCommand::ClosePath,
CGPathElementType::CloseSubpath => CubicPathCommand::ClosePath,
});
});
//println!("{:?}", commands);
let approx_stream = CubicPathCommandApproxStream::new(commands.into_iter(),
CURVE_APPROX_ERROR_BOUND);
let approx_commands: Vec<_> = approx_stream.collect();
return GlyphOutline {
commands: commands,
commands: approx_commands,
index: 0,
};