34 lines
1.4 KiB
Rust
34 lines
1.4 KiB
Rust
// pathfinder/renderer/src/post.rs
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//
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// Copyright © 2019 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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//! Functionality related to postprocessing effects.
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//!
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//! Since these effects run on GPU as fragment shaders, this contains no
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//! implementations, just shared declarations.
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#[derive(Clone, Copy, PartialEq, Debug)]
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pub struct DefringingKernel(pub [f32; 4]);
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/// This intentionally does not precisely match what Core Graphics does (a
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/// Lanczos function), because we don't want any ringing artefacts.
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pub static DEFRINGING_KERNEL_CORE_GRAPHICS: DefringingKernel =
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DefringingKernel([0.033165660, 0.102074051, 0.221434336, 0.286651906]);
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pub static DEFRINGING_KERNEL_FREETYPE: DefringingKernel =
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DefringingKernel([0.0, 0.031372549, 0.301960784, 0.337254902]);
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/// Should match macOS 10.13 High Sierra.
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pub static STEM_DARKENING_FACTORS: [f32; 2] = [0.0121, 0.0121 * 1.25];
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/// Should match macOS 10.13 High Sierra.
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pub const MAX_STEM_DARKENING_AMOUNT: [f32; 2] = [0.3, 0.3];
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/// This value is a subjective cutoff. Above this ppem value, no stem darkening is performed.
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pub const MAX_STEM_DARKENING_PIXELS_PER_EM: f32 = 72.0;
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