127 lines
4.1 KiB
Rust
127 lines
4.1 KiB
Rust
// pathfinder/color/src/lib.rs
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//
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// Copyright © 2020 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use pathfinder_simd::default::F32x4;
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use std::ops::{Add, Mul, Deref};
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/// ColorMatrix filter/transformation
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///
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/// The entries are stored in 5 columns of F32x4, each containing a row.
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#[derive(Copy, Clone, Debug, PartialEq)]
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pub struct ColorMatrix(pub [F32x4; 5]);
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impl ColorMatrix {
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#[inline]
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pub fn from_rows(rows: [[f32; 5]; 4]) -> ColorMatrix {
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ColorMatrix([
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F32x4::new(rows[0][0], rows[1][0], rows[2][0], rows[3][0]),
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F32x4::new(rows[0][1], rows[1][1], rows[2][1], rows[3][1]),
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F32x4::new(rows[0][2], rows[1][2], rows[2][2], rows[3][2]),
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F32x4::new(rows[0][3], rows[1][3], rows[2][3], rows[3][3]),
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F32x4::new(rows[0][4], rows[1][4], rows[2][4], rows[3][4]),
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])
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}
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/// Creates a hue-rotate color matrix filter from the given angle in radians.
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///
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/// See the `hueRotate` attribute of the `feColorMatrix` element in the SVG specification.
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pub fn hue_rotate(angle: f32) -> ColorMatrix {
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let a = ColorMatrix::from_rows([
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[ 0.213, 0.715, 0.072, 0.0, 0.0],
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[ 0.213, 0.715, 0.072, 0.0, 0.0],
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[ 0.213, 0.715, 0.072, 0.0, 0.0],
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[ 0.0, 0.0, 0.0, 1.0, 0.0],
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]);
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let b = ColorMatrix::from_rows([
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[ 0.787, -0.715, -0.072, 0.0, 0.0],
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[-0.213, 0.285, -0.072, 0.0, 0.0],
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[-0.213, -0.715, 0.928, 0.0, 0.0],
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[ 0.0, 0.0, 0.0, 0.0, 0.0],
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]);
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let c = ColorMatrix::from_rows([
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[-0.213, -0.715, 0.928, 0.0, 0.0],
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[ 0.143, 0.140, -0.283, 0.0, 0.0],
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[-0.787, 0.715, 0.072, 0.0, 0.0],
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[ 0.0, 0.0, 0.0, 0.0, 0.0],
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]);
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a + b * angle.cos() + c * angle.sin()
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}
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/// Creates a saturate color matrix filter with the given factor between 0 and 1.
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///
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/// See the `saturate` attribute of the `feColorMatrix` element in the SVG specification.
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pub fn saturate(saturation: f32) -> ColorMatrix {
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let a = ColorMatrix::from_rows([
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[ 0.213, 0.715, 0.072, 0.0, 0.0],
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[ 0.213, 0.715, 0.072, 0.0, 0.0],
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[ 0.213, 0.715, 0.072, 0.0, 0.0],
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[ 0.0, 0.0, 0.0, 1.0, 0.0],
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]);
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let b = ColorMatrix::from_rows([
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[ 0.787, -0.715, -0.072, 0.0, 0.0],
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[-0.213, 0.285, -0.072, 0.0, 0.0],
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[-0.213, -0.715, 0.928, 0.0, 0.0],
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[ 0.0, 0.0, 0.0, 0.0, 0.0],
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]);
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a + b * saturation
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}
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/// Creates a luminance-to-alpha color matrix filter.
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///
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/// See the `luminanceToAlpha` attribute of the `feColorMatrix` element in the SVG
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/// specification.
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pub fn luminance_to_alpha() -> ColorMatrix {
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ColorMatrix::from_rows([
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[ 0.0, 0.0, 0.0, 0.0, 0.0],
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[ 0.0, 0.0, 0.0, 0.0, 0.0],
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[ 0.0, 0.0, 0.0, 0.0, 0.0],
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[ 0.2125, 0.7154, 0.0721, 0.0, 0.0],
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])
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}
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}
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impl Deref for ColorMatrix {
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type Target = [F32x4; 5];
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#[inline]
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fn deref(&self) -> &[F32x4; 5] {
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&self.0
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}
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}
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impl Add for ColorMatrix {
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type Output = ColorMatrix;
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#[inline]
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fn add(self, rhs: ColorMatrix) -> ColorMatrix {
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ColorMatrix([
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self[0] + rhs[0],
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self[1] + rhs[1],
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self[2] + rhs[2],
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self[3] + rhs[3],
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self[4] + rhs[4],
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])
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}
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}
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impl Mul<f32> for ColorMatrix {
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type Output = ColorMatrix;
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#[inline]
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fn mul(self, rhs: f32) -> ColorMatrix {
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let rhs = F32x4::splat(rhs);
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ColorMatrix([
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self[0] * rhs,
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self[1] * rhs,
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self[2] * rhs,
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self[3] * rhs,
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self[4] * rhs,
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])
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}
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}
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