raphlinus’s gists

raphlinus / subpixel_antialias.py

Created May 1, 2019 13:59

Research code to do RGB subpixel antialiasing using angle info in signed distance fields

	import math

	# http://vcl.itn.liu.se/publications/2011/GS11/edtaa_preprint.pdf
	def tex(df, cos_th):
	cos_th = abs(cos_th)
	sin_th = math.sqrt(1 - cos_th ** 2)
	if cos_th < sin_th:
	cos_th, sin_th = sin_th, cos_th

	a1 = 0.5 * sin_th / cos_th # note: paper is missing the 0.5!

raphlinus / str_source.rs

Created April 25, 2019 15:42

Sketch of StrSource trait for access to string data

	use std::borrow::Cow;

	pub trait StrSource {
	fn len(&self) -> usize;

	fn str_at(&self, ix: usize) -> &str;

	fn str_before(&self, ix: usize) -> &str;

	fn to_string(&self) -> String {

raphlinus / fallback.rs

Created March 29, 2019 20:37

example code for dwrote-rs to exercise fallback

	extern crate dwrote;
	extern crate winapi;

	use std::borrow::Cow;
	use winapi::um::dwrite::{DWRITE_NUMBER_SUBSTITUTION_METHOD_NONE, DWRITE_READING_DIRECTION,
	DWRITE_READING_DIRECTION_LEFT_TO_RIGHT
	};

	use dwrote::{FontCollection, FontFallback, FontStretch, FontStyle, FontWeight, NumberSubstitution,
	TextAnalysisSource, TextAnalysisSourceImpl,

raphlinus / harfbuzz-boom.rs

Created March 13, 2019 23:36

Example of unsoundness in harfbuzz crate

	use harfbuzz::Blob;

	fn create_blob() -> Blob {
	let vec = vec![1; 256];
	Blob::new_read_only(&vec)
	// BAD: vec is dropped here, the blob still holds a reference
	}

	fn blob_sum(blob: &Blob) -> u32 {
	blob.iter().map(\|byte\| *byte as u32).sum()

raphlinus / exclusive.rs

Created March 3, 2019 10:51

Sketch of thread-safety idea for VST

	struct Key(Arc<()>);

	impl Key {
	pub fn new() {
	Key(Arc::new(()))
	}
	}

	// Note: Key is not Clone, there can be only one.

raphlinus / fragment of cocoa menu code

Created February 18, 2019 19:48

	let menubar = NSMenu::new(nil).autorelease();
	let app_menu_item = NSMenuItem::new(nil).autorelease();
	menubar.addItem_(app_menu_item);
	app.setMainMenu_(menubar);

	let app_menu = NSMenu::new(nil).autorelease();
	let quit_title = make_nsstring("Quit");
	let quit_action = selector("terminate:");
	let quit_key = make_nsstring("q");
	let quit_item = NSMenuItem::alloc(nil)

raphlinus / simd sine generation tests

Created October 10, 2018 22:45

	#![feature(test)]

	extern crate test;

	// Note: this dependency is nightly only
	extern crate packed_simd;

	#[macro_use]
	extern crate cfg_if;

raphlinus / parse.cu

Created April 23, 2018 19:31

sketch of prefix sum to do backslash unescaping in cuda

	// Copyright 2018 Google LLC
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,

raphlinus / Decodable.swift

Created December 29, 2017 19:10

Simple JSON task using new Decodable protocol

	// Copyright 2017 Google LLC
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// https://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,

raphlinus / ObjCLike.swift

Created December 29, 2017 19:09

Simple JSON task using Objective-C data structures

	// Copyright 2017 Google LLC
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// https://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,

Raph Levien raphlinus