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shaders: brightness_contrast_classic gpu node

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This commit is contained in:
firestar99
2025-08-26 19:29:33 +02:00
parent a96e7a17e8
commit b125d9e5ee
1 changed files with 34 additions and 11 deletions
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45
node-graph/graster-nodes/src/adjustments.rs
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@@ -141,6 +141,38 @@ fn make_opaque<T: Adjust<Color>>(
input
}
/// See [`brightness_contrast`]
#[node_macro::node(
name("Brightness/Contrast classic"),
category("Raster: Adjustment"),
properties("brightness_contrast_properties"),
shader_node(PerPixelAdjust)
)]
fn brightness_contrast_classic<T: Adjust<Color>>(
_: impl Ctx,
#[implementations(
Table<Raster<CPU>>,
Table<Color>,
Table<GradientStops>,
GradientStops,
)]
#[gpu_image]
mut input: T,
brightness: SignedPercentageF32,
contrast: SignedPercentageF32,
) -> T {
let brightness = brightness / 255.;
let contrast = contrast / 100.;
let contrast = if contrast > 0. { (contrast * core::f32::consts::FRAC_PI_2 - 0.01).tan() } else { contrast };
let offset = brightness * contrast + brightness - contrast / 2.;
input.adjust(|color| color.to_gamma_srgb().map_rgb(|c| (c + c * contrast + offset).clamp(0., 1.)).to_linear_srgb());
input
}
// Aims for interoperable compatibility with:
// https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#:~:text=%27brit%27%20%3D%20Brightness/Contrast
// https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#:~:text=Padding-,Brightness%20and%20Contrast,-Key%20is%20%27brit
@@ -149,7 +181,7 @@ fn make_opaque<T: Adjust<Color>>(
// https://geraldbakker.nl/psnumbers/brightness-contrast.html
#[node_macro::node(name("Brightness/Contrast"), category("Raster: Adjustment"), properties("brightness_contrast_properties"), cfg(feature = "std"))]
fn brightness_contrast<T: Adjust<Color>>(
_: impl Ctx,
_ctx: impl Ctx,
#[implementations(
Table<Raster<CPU>>,
Table<Color>,
@@ -163,16 +195,7 @@ fn brightness_contrast<T: Adjust<Color>>(
use_classic: bool,
) -> T {
if use_classic {
let brightness = brightness / 255.;
let contrast = contrast / 100.;
let contrast = if contrast > 0. { (contrast * core::f32::consts::FRAC_PI_2 - 0.01).tan() } else { contrast };
let offset = brightness * contrast + brightness - contrast / 2.;
input.adjust(|color| color.to_gamma_srgb().map_rgb(|c| (c + c * contrast + offset).clamp(0., 1.)).to_linear_srgb());
return input;
return brightness_contrast_classic(_ctx, input, brightness, contrast);
}
const WINDOW_SIZE: usize = 1024;