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{"files":{"CHANGELOG.md":"f40c8fae65d889f504d619983bbab8cbc370995049ba3077acc2ba01f8116e89","Cargo.toml":"4fbf6705c2a5a23335605339c159208d1a376189693e645a6b0a30f9885be328","LICENSE":"15c517f38838988aa9f990a1e6bdfc0f20fd1aa1dcb710bb994669d098d73e70","README.md":"59162e54bce67b4181f793866a73e4906b3cb4b45f3487f045aca2ce06611a80","src/geometry.rs":"8d970a944af7199ac6a42ace5d1ca661f7764d10a2af0eb09f7b356547f80cf8","src/lib.rs":"32f718b6be690d4d22fa60bf2d2f3b73f645e293a12f0e7c969c7ff2ac2f0a54","src/nostd_float.rs":"425e4f7a3c20213d561a376a09cb75a37ba3989b42e1700a3b15f642ccb99918","src/raster.rs":"9cb90f50a5a915e17f3ea46efd4cd1cf748ec94dc5307878643dd315baa79663","tests/issues.rs":"dff1f0f9992a49a71b3ac4e298033fe9687194a7948bdf29b110daa1ccc99790"},"package":"c71b1793ee61086797f5c80b6efa2b8ffa6d5dd703f118545808a7f2e27f7046"}

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# 0.1.8
* Do SIMD runtime detection only once on the first `Rasterizer::new` instead of on each.
# 0.1.7
* Fix x86, x86_64 no_std builds, require `std` feature for runtime detected SIMD.
# 0.1.6
* Add runtime detected AVX2 or SSE4.2 line drawing. Improves performance on compatible x86_64 CPUs.
# 0.1.5
* Remove cap of `1.0` for coverage values returned by `for_each_pixel` now `>= 1.0` means fully covered.
This allows a minor reduction in operations / performance boost.
# 0.1.4
* Add `Rasterizer::reset`, `Rasterizer::clear` methods to allow allocation reuse.
# 0.1.3
* Fix index oob panic scenario.
# 0.1.2
* For `Point` implement `Sub`, `Add`, `SubAssign`, `AddAssign`, `PartialEq`, `PartialOrd`, `From<(x, y)>`,
`From<[x, y]>` for easier use downstream.
* Switch `Point` `Debug` implementation to output `point(1.2, 3.4)` smaller representation referring to the `point` fn.
# 0.1.1
* Add explicit compile error when building no_std without the "libm" feature.
# 0.1
* Implement zero dependency coverage rasterization for lines, quadratic & cubic beziers.

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
name = "ab_glyph_rasterizer"
version = "0.1.8"
authors = ["Alex Butler <alexheretic@gmail.com>"]
description = "Coverage rasterization for lines, quadratic & cubic beziers"
readme = "README.md"
keywords = [
"text",
"ttf",
"otf",
"font",
]
license = "Apache-2.0"
repository = "https://github.com/alexheretic/ab-glyph"
[dependencies.libm]
version = "0.2.1"
optional = true
[dev-dependencies]
[features]
default = ["std"]
std = []

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ab_glyph_rasterizer
[![crates.io](https://img.shields.io/crates/v/ab_glyph_rasterizer.svg)](https://crates.io/crates/ab_glyph_rasterizer)
[![Documentation](https://docs.rs/ab_glyph_rasterizer/badge.svg)](https://docs.rs/ab_glyph_rasterizer)
===================
Coverage rasterization for lines, quadratic & cubic beziers.
Useful for drawing .otf font glyphs.
Inspired by [font-rs](https://github.com/raphlinus/font-rs) &
[stb_truetype](https://github.com/nothings/stb/blob/master/stb_truetype.h).
## Example
```rust
let mut rasterizer = ab_glyph_rasterizer::Rasterizer::new(106, 183);
// draw a 300px 'ę' character
rasterizer.draw_cubic(point(103.0, 163.5), point(86.25, 169.25), point(77.0, 165.0), point(82.25, 151.5));
rasterizer.draw_cubic(point(82.25, 151.5), point(86.75, 139.75), point(94.0, 130.75), point(102.0, 122.0));
rasterizer.draw_line(point(102.0, 122.0), point(100.25, 111.25));
rasterizer.draw_cubic(point(100.25, 111.25), point(89.0, 112.75), point(72.75, 114.25), point(58.5, 114.25));
rasterizer.draw_cubic(point(58.5, 114.25), point(30.75, 114.25), point(18.5, 105.25), point(16.75, 72.25));
rasterizer.draw_line(point(16.75, 72.25), point(77.0, 72.25));
rasterizer.draw_cubic(point(77.0, 72.25), point(97.0, 72.25), point(105.25, 60.25), point(104.75, 38.5));
rasterizer.draw_cubic(point(104.75, 38.5), point(104.5, 13.5), point(89.0, 0.75), point(54.25, 0.75));
rasterizer.draw_cubic(point(54.25, 0.75), point(16.0, 0.75), point(0.0, 16.75), point(0.0, 64.0));
rasterizer.draw_cubic(point(0.0, 64.0), point(0.0, 110.5), point(16.0, 128.0), point(56.5, 128.0));
rasterizer.draw_cubic(point(56.5, 128.0), point(66.0, 128.0), point(79.5, 127.0), point(90.0, 125.0));
rasterizer.draw_cubic(point(90.0, 125.0), point(78.75, 135.25), point(73.25, 144.5), point(70.75, 152.0));
rasterizer.draw_cubic(point(70.75, 152.0), point(64.5, 169.0), point(75.5, 183.0), point(105.0, 170.5));
rasterizer.draw_line(point(105.0, 170.5), point(103.0, 163.5));
rasterizer.draw_cubic(point(55.0, 14.5), point(78.5, 14.5), point(88.5, 21.75), point(88.75, 38.75));
rasterizer.draw_cubic(point(88.75, 38.75), point(89.0, 50.75), point(85.75, 59.75), point(73.5, 59.75));
rasterizer.draw_line(point(73.5, 59.75), point(16.5, 59.75));
rasterizer.draw_cubic(point(16.5, 59.75), point(17.25, 25.5), point(27.0, 14.5), point(55.0, 14.5));
rasterizer.draw_line(point(55.0, 14.5), point(55.0, 14.5));
// iterate over the resultant pixel alphas, e.g. save pixel to a buffer
rasterizer.for_each_pixel(|index, alpha| {
// ...
});
```
Rendering the resultant pixel alphas as 8-bit grey produces:
![reference_otf_tailed_e](https://user-images.githubusercontent.com/2331607/78987793-ee95f480-7b26-11ea-91fb-e9f359d766f8.png)
## no_std
no_std environments are supported using `alloc` & [`libm`](https://github.com/rust-lang/libm).
```toml
ab_glyph_rasterizer = { default-features = false, features = ["libm"] }
```

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#[cfg(all(feature = "libm", not(feature = "std")))]
use crate::nostd_float::FloatExt;
/// An (x, y) coordinate.
///
/// # Example
/// ```
/// use ab_glyph_rasterizer::{point, Point};
/// let p: Point = point(0.1, 23.2);
/// ```
#[derive(Clone, Copy, Default, PartialEq, PartialOrd)]
pub struct Point {
pub x: f32,
pub y: f32,
}
impl core::fmt::Debug for Point {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
write!(f, "point({:?}, {:?})", self.x, self.y)
}
}
impl Point {
#[inline]
pub(crate) fn distance_to(self, other: Point) -> f32 {
let d = other - self;
(d.x * d.x + d.y * d.y).sqrt()
}
}
/// [`Point`](struct.Point.html) constructor.
///
/// # Example
/// ```
/// # use ab_glyph_rasterizer::{point, Point};
/// let p = point(0.1, 23.2);
/// ```
#[inline]
pub fn point(x: f32, y: f32) -> Point {
Point { x, y }
}
/// Linear interpolation between points.
#[inline]
pub(crate) fn lerp(t: f32, p0: Point, p1: Point) -> Point {
point(p0.x + t * (p1.x - p0.x), p0.y + t * (p1.y - p0.y))
}
impl core::ops::Sub for Point {
type Output = Point;
/// Subtract rhs.x from x, rhs.y from y.
///
/// ```
/// # use ab_glyph_rasterizer::*;
/// let p1 = point(1.0, 2.0) - point(2.0, 1.5);
///
/// assert!((p1.x - -1.0).abs() <= core::f32::EPSILON);
/// assert!((p1.y - 0.5).abs() <= core::f32::EPSILON);
/// ```
#[inline]
fn sub(self, rhs: Point) -> Point {
point(self.x - rhs.x, self.y - rhs.y)
}
}
impl core::ops::Add for Point {
type Output = Point;
/// Add rhs.x to x, rhs.y to y.
///
/// ```
/// # use ab_glyph_rasterizer::*;
/// let p1 = point(1.0, 2.0) + point(2.0, 1.5);
///
/// assert!((p1.x - 3.0).abs() <= core::f32::EPSILON);
/// assert!((p1.y - 3.5).abs() <= core::f32::EPSILON);
/// ```
#[inline]
fn add(self, rhs: Point) -> Point {
point(self.x + rhs.x, self.y + rhs.y)
}
}
impl core::ops::AddAssign for Point {
/// ```
/// # use ab_glyph_rasterizer::*;
/// let mut p1 = point(1.0, 2.0);
/// p1 += point(2.0, 1.5);
///
/// assert!((p1.x - 3.0).abs() <= core::f32::EPSILON);
/// assert!((p1.y - 3.5).abs() <= core::f32::EPSILON);
/// ```
#[inline]
fn add_assign(&mut self, other: Self) {
self.x += other.x;
self.y += other.y;
}
}
impl core::ops::SubAssign for Point {
/// ```
/// # use ab_glyph_rasterizer::*;
/// let mut p1 = point(1.0, 2.0);
/// p1 -= point(2.0, 1.5);
///
/// assert!((p1.x - -1.0).abs() <= core::f32::EPSILON);
/// assert!((p1.y - 0.5).abs() <= core::f32::EPSILON);
/// ```
#[inline]
fn sub_assign(&mut self, other: Self) {
self.x -= other.x;
self.y -= other.y;
}
}
impl<F: Into<f32>> From<(F, F)> for Point {
/// ```
/// # use ab_glyph_rasterizer::*;
/// let p: Point = (23_f32, 34.5_f32).into();
/// let p2: Point = (5u8, 44u8).into();
/// ```
#[inline]
fn from((x, y): (F, F)) -> Self {
point(x.into(), y.into())
}
}
impl<F: Into<f32>> From<[F; 2]> for Point {
/// ```
/// # use ab_glyph_rasterizer::*;
/// let p: Point = [23_f32, 34.5].into();
/// let p2: Point = [5u8, 44].into();
/// ```
#[inline]
fn from([x, y]: [F; 2]) -> Self {
point(x.into(), y.into())
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn distance_to() {
let distance = point(0.0, 0.0).distance_to(point(3.0, 4.0));
assert!((distance - 5.0).abs() <= core::f32::EPSILON);
}
}

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//! Coverage rasterization for lines, quadratic & cubic beziers.
//! Useful for drawing .otf font glyphs.
//!
//! ```
//! use ab_glyph_rasterizer::Rasterizer;
//! # let (width, height) = (1, 1);
//! let mut rasterizer = Rasterizer::new(width, height);
//!
//! // draw outlines
//! # let [l0, l1, q0, q1, q2, c0, c1, c2, c3] = [ab_glyph_rasterizer::point(0.0, 0.0); 9];
//! rasterizer.draw_line(l0, l1);
//! rasterizer.draw_quad(q0, q1, q2);
//! rasterizer.draw_cubic(c0, c1, c2, c3);
//!
//! // iterate over the resultant pixel alphas, e.g. save pixel to a buffer
//! rasterizer.for_each_pixel(|index, alpha| {
//! // ...
//! });
//! ```
#![cfg_attr(not(feature = "std"), no_std)]
#[cfg(not(feature = "std"))]
#[macro_use]
extern crate alloc;
#[cfg(all(feature = "libm", not(feature = "std")))]
mod nostd_float;
#[cfg(not(any(feature = "libm", feature = "std")))]
compile_error!("You need to activate either the `std` or `libm` feature.");
mod geometry;
mod raster;
pub use geometry::{point, Point};
pub use raster::Rasterizer;

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/// Basic required float operations.
pub(crate) trait FloatExt {
fn floor(self) -> Self;
fn ceil(self) -> Self;
fn sqrt(self) -> Self;
fn round(self) -> Self;
fn abs(self) -> Self;
}
impl FloatExt for f32 {
#[inline]
fn floor(self) -> Self {
libm::floorf(self)
}
#[inline]
fn ceil(self) -> Self {
libm::ceilf(self)
}
#[inline]
fn sqrt(self) -> Self {
libm::sqrtf(self)
}
#[inline]
fn round(self) -> Self {
libm::roundf(self)
}
#[inline]
fn abs(self) -> Self {
libm::fabsf(self)
}
}

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// Forked/repurposed from `font-rs` code: https://github.com/raphlinus/font-rs
// Copyright 2015 Google Inc. All rights reserved.
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Modifications copyright (C) 2020 Alex Butler
//
// Cubic bezier drawing adapted from stb_truetype: https://github.com/nothings/stb
#[cfg(all(feature = "libm", not(feature = "std")))]
use crate::nostd_float::FloatExt;
#[cfg(not(feature = "std"))]
use alloc::vec::Vec;
use crate::geometry::{lerp, Point};
type DrawLineFn = unsafe fn(&mut Rasterizer, Point, Point);
/// Coverage rasterizer for lines, quadratic & cubic beziers.
pub struct Rasterizer {
width: usize,
height: usize,
a: Vec<f32>,
draw_line_fn: DrawLineFn,
}
impl Rasterizer {
/// Allocates a new rasterizer that can draw onto a `width` x `height` alpha grid.
///
/// ```
/// use ab_glyph_rasterizer::Rasterizer;
/// let mut rasterizer = Rasterizer::new(14, 38);
/// ```
pub fn new(width: usize, height: usize) -> Self {
Self {
width,
height,
a: vec![0.0; width * height + 4],
draw_line_fn: optimal_draw_line_fn(),
}
}
/// Resets the rasterizer to an empty `width` x `height` alpha grid. This method behaves as if
/// the Rasterizer were re-created, with the advantage of not allocating if the total number of
/// pixels of the grid does not increase.
///
/// ```
/// # use ab_glyph_rasterizer::Rasterizer;
/// # let mut rasterizer = Rasterizer::new(14, 38);
/// rasterizer.reset(12, 24);
/// assert_eq!(rasterizer.dimensions(), (12, 24));
/// ```
pub fn reset(&mut self, width: usize, height: usize) {
self.width = width;
self.height = height;
self.a.truncate(0);
self.a.resize(width * height + 4, 0.0);
}
/// Clears the rasterizer. This method behaves as if the Rasterizer were re-created with the same
/// dimensions, but does not perform an allocation.
///
/// ```
/// # use ab_glyph_rasterizer::Rasterizer;
/// # let mut rasterizer = Rasterizer::new(14, 38);
/// rasterizer.clear();
/// ```
pub fn clear(&mut self) {
for px in &mut self.a {
*px = 0.0;
}
}
/// Returns the dimensions the rasterizer was built to draw to.
///
/// ```
/// # use ab_glyph_rasterizer::*;
/// let rasterizer = Rasterizer::new(9, 8);
/// assert_eq!((9, 8), rasterizer.dimensions());
/// ```
pub fn dimensions(&self) -> (usize, usize) {
(self.width, self.height)
}
/// Adds a straight line from `p0` to `p1` to the outline.
///
/// ```
/// # use ab_glyph_rasterizer::*;
/// # let mut rasterizer = Rasterizer::new(9, 8);
/// rasterizer.draw_line(point(0.0, 0.48), point(1.22, 0.48));
/// ```
pub fn draw_line(&mut self, p0: Point, p1: Point) {
unsafe { (self.draw_line_fn)(self, p0, p1) }
}
#[inline(always)] // must inline for simd versions
fn draw_line_scalar(&mut self, p0: Point, p1: Point) {
if (p0.y - p1.y).abs() <= core::f32::EPSILON {
return;
}
let (dir, p0, p1) = if p0.y < p1.y {
(1.0, p0, p1)
} else {
(-1.0, p1, p0)
};
let dxdy = (p1.x - p0.x) / (p1.y - p0.y);
let mut x = p0.x;
let y0 = p0.y as usize; // note: implicit max of 0 because usize
if p0.y < 0.0 {
x -= p0.y * dxdy;
}
for y in y0..self.height.min(p1.y.ceil() as usize) {
let linestart = y * self.width;
let dy = ((y + 1) as f32).min(p1.y) - (y as f32).max(p0.y);
let xnext = x + dxdy * dy;
let d = dy * dir;
let (x0, x1) = if x < xnext { (x, xnext) } else { (xnext, x) };
let x0floor = x0.floor();
let x0i = x0floor as i32;
let x1ceil = x1.ceil();
let x1i = x1ceil as i32;
if x1i <= x0i + 1 {
let xmf = 0.5 * (x + xnext) - x0floor;
let linestart_x0i = linestart as isize + x0i as isize;
if linestart_x0i < 0 {
continue; // oob index
}
self.a[linestart_x0i as usize] += d - d * xmf;
self.a[linestart_x0i as usize + 1] += d * xmf;
} else {
let s = (x1 - x0).recip();
let x0f = x0 - x0floor;
let a0 = 0.5 * s * (1.0 - x0f) * (1.0 - x0f);
let x1f = x1 - x1ceil + 1.0;
let am = 0.5 * s * x1f * x1f;
let linestart_x0i = linestart as isize + x0i as isize;
if linestart_x0i < 0 {
continue; // oob index
}
self.a[linestart_x0i as usize] += d * a0;
if x1i == x0i + 2 {
self.a[linestart_x0i as usize + 1] += d * (1.0 - a0 - am);
} else {
let a1 = s * (1.5 - x0f);
self.a[linestart_x0i as usize + 1] += d * (a1 - a0);
for xi in x0i + 2..x1i - 1 {
self.a[linestart + xi as usize] += d * s;
}
let a2 = a1 + (x1i - x0i - 3) as f32 * s;
self.a[linestart + (x1i - 1) as usize] += d * (1.0 - a2 - am);
}
self.a[linestart + x1i as usize] += d * am;
}
x = xnext;
}
}
/// Adds a quadratic Bézier curve from `p0` to `p2` to the outline using `p1` as the control.
///
/// ```
/// # use ab_glyph_rasterizer::*;
/// # let mut rasterizer = Rasterizer::new(14, 38);
/// rasterizer.draw_quad(point(6.2, 34.5), point(7.2, 34.5), point(9.2, 34.0));
/// ```
pub fn draw_quad(&mut self, p0: Point, p1: Point, p2: Point) {
let devx = p0.x - 2.0 * p1.x + p2.x;
let devy = p0.y - 2.0 * p1.y + p2.y;
let devsq = devx * devx + devy * devy;
if devsq < 0.333 {
self.draw_line(p0, p2);
return;
}
let tol = 3.0;
let n = 1 + (tol * devsq).sqrt().sqrt().floor() as usize;
let mut p = p0;
let nrecip = (n as f32).recip();
let mut t = 0.0;
for _i in 0..n - 1 {
t += nrecip;
let pn = lerp(t, lerp(t, p0, p1), lerp(t, p1, p2));
self.draw_line(p, pn);
p = pn;
}
self.draw_line(p, p2);
}
/// Adds a cubic Bézier curve from `p0` to `p3` to the outline using `p1` as the control
/// at the beginning of the curve and `p2` at the end of the curve.
///
/// ```
/// # use ab_glyph_rasterizer::*;
/// # let mut rasterizer = Rasterizer::new(12, 20);
/// rasterizer.draw_cubic(
/// point(10.3, 16.4),
/// point(8.6, 16.9),
/// point(7.7, 16.5),
/// point(8.2, 15.2),
/// );
/// ```
pub fn draw_cubic(&mut self, p0: Point, p1: Point, p2: Point, p3: Point) {
self.tesselate_cubic(p0, p1, p2, p3, 0);
}
// stb_truetype style cubic approximation by lines.
fn tesselate_cubic(&mut self, p0: Point, p1: Point, p2: Point, p3: Point, n: u8) {
// ...I'm not sure either ¯\_(ツ)_/¯
const OBJSPACE_FLATNESS: f32 = 0.35;
const OBJSPACE_FLATNESS_SQUARED: f32 = OBJSPACE_FLATNESS * OBJSPACE_FLATNESS;
const MAX_RECURSION_DEPTH: u8 = 16;
let longlen = p0.distance_to(p1) + p1.distance_to(p2) + p2.distance_to(p3);
let shortlen = p0.distance_to(p3);
let flatness_squared = longlen * longlen - shortlen * shortlen;
if n < MAX_RECURSION_DEPTH && flatness_squared > OBJSPACE_FLATNESS_SQUARED {
let p01 = lerp(0.5, p0, p1);
let p12 = lerp(0.5, p1, p2);
let p23 = lerp(0.5, p2, p3);
let pa = lerp(0.5, p01, p12);
let pb = lerp(0.5, p12, p23);
let mp = lerp(0.5, pa, pb);
self.tesselate_cubic(p0, p01, pa, mp, n + 1);
self.tesselate_cubic(mp, pb, p23, p3, n + 1);
} else {
self.draw_line(p0, p3);
}
}
/// Run a callback for each pixel `index` & `alpha`, with indices in `0..width * height`.
///
/// An `alpha` coverage value of `0.0` means the pixel is not covered at all by the glyph,
/// whereas a value of `1.0` (or greater) means the pixel is totally covered.
///
/// ```
/// # use ab_glyph_rasterizer::*;
/// # let (width, height) = (1, 1);
/// # let mut rasterizer = Rasterizer::new(width, height);
/// let mut pixels = vec![0u8; width * height];
/// rasterizer.for_each_pixel(|index, alpha| {
/// pixels[index] = (alpha * 255.0) as u8;
/// });
/// ```
pub fn for_each_pixel<O: FnMut(usize, f32)>(&self, mut px_fn: O) {
let mut acc = 0.0;
self.a[..self.width * self.height]
.iter()
.enumerate()
.for_each(|(idx, c)| {
acc += c;
px_fn(idx, acc.abs());
});
}
/// Run a callback for each pixel x position, y position & alpha.
///
/// Convenience wrapper for [`Rasterizer::for_each_pixel`].
///
/// ```
/// # use ab_glyph_rasterizer::*;
/// # let mut rasterizer = Rasterizer::new(1, 1);
/// # struct Img;
/// # impl Img { fn set_pixel(&self, x: u32, y: u32, a: u8) {} }
/// # let image = Img;
/// rasterizer.for_each_pixel_2d(|x, y, alpha| {
/// image.set_pixel(x, y, (alpha * 255.0) as u8);
/// });
/// ```
pub fn for_each_pixel_2d<O: FnMut(u32, u32, f32)>(&self, mut px_fn: O) {
let width32 = self.width as u32;
self.for_each_pixel(|idx, alpha| px_fn(idx as u32 % width32, idx as u32 / width32, alpha));
}
}
/// ```
/// let rasterizer = ab_glyph_rasterizer::Rasterizer::new(3, 4);
/// assert_eq!(
/// &format!("{:?}", rasterizer),
/// "Rasterizer { width: 3, height: 4 }"
/// );
/// ```
impl core::fmt::Debug for Rasterizer {
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
f.debug_struct("Rasterizer")
.field("width", &self.width)
.field("height", &self.height)
.finish()
}
}
#[cfg(all(feature = "std", any(target_arch = "x86", target_arch = "x86_64")))]
#[target_feature(enable = "avx2")]
unsafe fn draw_line_avx2(rast: &mut Rasterizer, p0: Point, p1: Point) {
rast.draw_line_scalar(p0, p1)
}
#[cfg(all(feature = "std", any(target_arch = "x86", target_arch = "x86_64")))]
#[target_feature(enable = "sse4.2")]
unsafe fn draw_line_sse4_2(rast: &mut Rasterizer, p0: Point, p1: Point) {
rast.draw_line_scalar(p0, p1)
}
/// Return most optimal `DrawLineFn` impl.
///
/// With feature `std` on x86/x86_64 will use one-time runtime detection
/// to pick the best SIMD impl. Otherwise uses a scalar version.
fn optimal_draw_line_fn() -> DrawLineFn {
unsafe {
// safe as write synchronised by Once::call_once or no-write
static mut DRAW_LINE_FN: DrawLineFn = Rasterizer::draw_line_scalar;
#[cfg(all(feature = "std", any(target_arch = "x86", target_arch = "x86_64")))]
{
static INIT: std::sync::Once = std::sync::Once::new();
INIT.call_once(|| {
// runtime detect optimal simd impls
if is_x86_feature_detected!("avx2") {
DRAW_LINE_FN = draw_line_avx2
} else if is_x86_feature_detected!("sse4.2") {
DRAW_LINE_FN = draw_line_sse4_2
}
});
}
DRAW_LINE_FN
}
}

10
third-party/vendor/ab_glyph_rasterizer/tests/issues.rs vendored Normal file
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@ -0,0 +1,10 @@
use ab_glyph_rasterizer::*;
/// Index oob panic rasterizing "Gauntl" using Bitter-Regular.otf
#[test]
fn rusttype_156_index_panic() {
let mut r = Rasterizer::new(6, 16);
r.draw_line(point(5.54, 14.299999), point(3.7399998, 13.799999));
r.draw_line(point(3.7399998, 13.799999), point(3.7399998, 0.0));
r.draw_line(point(3.7399998, 0.0), point(0.0, 0.10000038));
}