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background: cache computed gradient images

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Avoid recomputing on each config change/reload.
This commit is contained in:
Wez Furlong 2022-06-01 07:29:24 -07:00
parent 167127c14b
commit 2b083cc131
2 changed files with 161 additions and 108 deletions
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10
config/src/background.rs
View File

@ -290,7 +290,7 @@ impl Default for BackgroundOrigin {
}
}
#[derive(Debug, Copy, Clone, FromDynamic, ToDynamic)]
#[derive(Debug, Copy, Clone, FromDynamic, ToDynamic, PartialEq)]
pub enum Interpolation {
Linear,
Basis,
@ -303,7 +303,7 @@ impl Default for Interpolation {
}
}
#[derive(Debug, Copy, Clone, FromDynamic, ToDynamic)]
#[derive(Debug, Copy, Clone, FromDynamic, ToDynamic, PartialEq)]
pub enum BlendMode {
Rgb,
LinearRgb,
@ -317,7 +317,7 @@ impl Default for BlendMode {
}
}
#[derive(Debug, Copy, Clone, FromDynamic, ToDynamic)]
#[derive(Debug, Copy, Clone, FromDynamic, ToDynamic, PartialEq)]
pub enum GradientOrientation {
Horizontal,
Vertical,
@ -337,7 +337,7 @@ impl Default for GradientOrientation {
}
}
#[derive(Debug, Copy, Clone, FromDynamic, ToDynamic)]
#[derive(Debug, Copy, Clone, FromDynamic, ToDynamic, PartialEq)]
pub enum GradientPreset {
Blues,
BrBg,
@ -424,7 +424,7 @@ impl GradientPreset {
}
}
#[derive(Debug, Clone, FromDynamic, ToDynamic)]
#[derive(Debug, Clone, FromDynamic, ToDynamic, PartialEq)]
pub struct Gradient {
#[dynamic(default)]
pub orientation: GradientOrientation,

259
wezterm-gui/src/termwindow/background.rs
View File

@ -5,7 +5,7 @@ use crate::Dimensions;
use anyhow::Context;
use config::{
BackgroundHorizontalAlignment, BackgroundLayer, BackgroundRepeat, BackgroundSize,
BackgroundSource, BackgroundVerticalAlignment, ConfigHandle, DimensionContext,
BackgroundSource, BackgroundVerticalAlignment, ConfigHandle, DimensionContext, Gradient,
GradientOrientation,
};
use std::collections::HashMap;
@ -16,6 +16,158 @@ use wezterm_term::StableRowIndex;
lazy_static::lazy_static! {
static ref IMAGE_CACHE: Mutex<HashMap<String, CachedImage>> = Mutex::new(HashMap::new());
static ref GRADIENT_CACHE: Mutex<Vec<CachedGradient>> = Mutex::new(vec![]);
}
struct CachedGradient {
g: Gradient,
width: u32,
height: u32,
image: Arc<ImageData>,
marked: bool,
}
impl CachedGradient {
fn compute(g: &Gradient, width: u32, height: u32) -> anyhow::Result<Arc<ImageData>> {
let grad = g
.build()
.with_context(|| format!("building gradient {:?}", g))?;
let mut imgbuf = image::RgbaImage::new(width, height);
let fw = width as f64;
let fh = height as f64;
fn to_pixel(c: colorgrad::Color) -> image::Rgba<u8> {
let (r, g, b, a) = c.rgba_u8();
image::Rgba([r, g, b, a])
}
// Map t which is in range [a, b] to range [c, d]
fn remap(t: f64, a: f64, b: f64, c: f64, d: f64) -> f64 {
(t - a) * ((d - c) / (b - a)) + c
}
let (dmin, dmax) = grad.domain();
let rng = fastrand::Rng::new();
// We add some randomness to the position that we use to
// index into the color gradient, so that we can avoid
// visible color banding. The default 64 was selected
// because it it was the smallest value on my mac where
// the banding wasn't obvious.
let noise_amount = g.noise.unwrap_or_else(|| {
if matches!(g.orientation, GradientOrientation::Radial { .. }) {
16
} else {
64
}
});
fn noise(rng: &fastrand::Rng, noise_amount: usize) -> f64 {
if noise_amount == 0 {
0.
} else {
rng.usize(0..noise_amount) as f64 * -1.
}
}
match g.orientation {
GradientOrientation::Horizontal => {
for (x, _, pixel) in imgbuf.enumerate_pixels_mut() {
*pixel = to_pixel(grad.at(remap(
x as f64 + noise(&rng, noise_amount),
0.0,
fw,
dmin,
dmax,
)));
}
}
GradientOrientation::Vertical => {
for (_, y, pixel) in imgbuf.enumerate_pixels_mut() {
*pixel = to_pixel(grad.at(remap(
y as f64 + noise(&rng, noise_amount),
0.0,
fh,
dmin,
dmax,
)));
}
}
GradientOrientation::Linear { angle } => {
let angle = angle.unwrap_or(0.0).to_radians();
for (x, y, pixel) in imgbuf.enumerate_pixels_mut() {
let (x, y) = (x as f64, y as f64);
let (x, y) = (x - fw / 2., y - fh / 2.);
let t = x * f64::cos(angle) - y * f64::sin(angle);
*pixel = to_pixel(grad.at(remap(
t + noise(&rng, noise_amount),
-fw / 2.,
fw / 2.,
dmin,
dmax,
)));
}
}
GradientOrientation::Radial { radius, cx, cy } => {
let radius = fw * radius.unwrap_or(0.5);
let cx = fw * cx.unwrap_or(0.5);
let cy = fh * cy.unwrap_or(0.5);
for (x, y, pixel) in imgbuf.enumerate_pixels_mut() {
let nx = noise(&rng, noise_amount);
let ny = noise(&rng, noise_amount);
let t = (nx + (x as f64 - cx).powi(2) + (ny + y as f64 - cy).powi(2)).sqrt()
/ radius;
*pixel = to_pixel(grad.at(t));
}
}
}
let data = imgbuf.into_vec();
let image = Arc::new(ImageData::with_data(ImageDataType::new_single_frame(
width, height, data,
)));
Ok(image)
}
fn load(g: &Gradient, width: u32, height: u32) -> anyhow::Result<Arc<ImageData>> {
let mut cache = GRADIENT_CACHE.lock().unwrap();
if let Some(entry) = cache
.iter_mut()
.find(|entry| entry.g == *g && entry.width == width && entry.height == height)
{
entry.marked = false;
return Ok(Arc::clone(&entry.image));
}
let image = Self::compute(g, width, height)?;
cache.push(Self {
g: g.clone(),
width,
height,
image: Arc::clone(&image),
marked: false,
});
Ok(image)
}
fn mark() {
let mut cache = GRADIENT_CACHE.lock().unwrap();
for entry in cache.iter_mut() {
entry.marked = true;
}
}
fn sweep() {
let mut cache = GRADIENT_CACHE.lock().unwrap();
cache.retain(|entry| !entry.marked);
}
}
struct CachedImage {
@ -99,10 +251,6 @@ fn load_background_layer(
let data = match &layer.source {
BackgroundSource::Gradient(g) => {
let grad = g
.build()
.with_context(|| format!("building gradient {:?}", g))?;
let mut width = match layer.width {
BackgroundSize::Dimension(d) => d.evaluate_as_pixels(h_context),
unsup => anyhow::bail!("{:?} not yet implemented", unsup),
@ -120,104 +268,7 @@ fn load_background_layer(
height = height.min(width);
}
let mut imgbuf = image::RgbaImage::new(width, height);
let fw = width as f64;
let fh = height as f64;
fn to_pixel(c: colorgrad::Color) -> image::Rgba<u8> {
let (r, g, b, a) = c.rgba_u8();
image::Rgba([r, g, b, a])
}
// Map t which is in range [a, b] to range [c, d]
fn remap(t: f64, a: f64, b: f64, c: f64, d: f64) -> f64 {
(t - a) * ((d - c) / (b - a)) + c
}
let (dmin, dmax) = grad.domain();
let rng = fastrand::Rng::new();
// We add some randomness to the position that we use to
// index into the color gradient, so that we can avoid
// visible color banding. The default 64 was selected
// because it it was the smallest value on my mac where
// the banding wasn't obvious.
let noise_amount = g.noise.unwrap_or_else(|| {
if matches!(g.orientation, GradientOrientation::Radial { .. }) {
16
} else {
64
}
});
fn noise(rng: &fastrand::Rng, noise_amount: usize) -> f64 {
if noise_amount == 0 {
0.
} else {
rng.usize(0..noise_amount) as f64 * -1.
}
}
match g.orientation {
GradientOrientation::Horizontal => {
for (x, _, pixel) in imgbuf.enumerate_pixels_mut() {
*pixel = to_pixel(grad.at(remap(
x as f64 + noise(&rng, noise_amount),
0.0,
fw,
dmin,
dmax,
)));
}
}
GradientOrientation::Vertical => {
for (_, y, pixel) in imgbuf.enumerate_pixels_mut() {
*pixel = to_pixel(grad.at(remap(
y as f64 + noise(&rng, noise_amount),
0.0,
fh,
dmin,
dmax,
)));
}
}
GradientOrientation::Linear { angle } => {
let angle = angle.unwrap_or(0.0).to_radians();
for (x, y, pixel) in imgbuf.enumerate_pixels_mut() {
let (x, y) = (x as f64, y as f64);
let (x, y) = (x - fw / 2., y - fh / 2.);
let t = x * f64::cos(angle) - y * f64::sin(angle);
*pixel = to_pixel(grad.at(remap(
t + noise(&rng, noise_amount),
-fw / 2.,
fw / 2.,
dmin,
dmax,
)));
}
}
GradientOrientation::Radial { radius, cx, cy } => {
let radius = fw * radius.unwrap_or(0.5);
let cx = fw * cx.unwrap_or(0.5);
let cy = fh * cy.unwrap_or(0.5);
for (x, y, pixel) in imgbuf.enumerate_pixels_mut() {
let nx = noise(&rng, noise_amount);
let ny = noise(&rng, noise_amount);
let t = (nx + (x as f64 - cx).powi(2) + (ny + y as f64 - cy).powi(2))
.sqrt()
/ radius;
*pixel = to_pixel(grad.at(t));
}
}
}
let data = imgbuf.into_vec();
Arc::new(ImageData::with_data(ImageDataType::new_single_frame(
width, height, data,
)))
CachedGradient::load(g, width, height)?
}
BackgroundSource::Color(color) => {
// In theory we could just make a 1x1 texture and allow
@ -295,6 +346,7 @@ pub fn reload_background_image(
.collect();
CachedImage::mark();
CachedGradient::mark();
let result = load_background_image(config, dimensions, render_metrics)
.into_iter()
@ -310,6 +362,7 @@ pub fn reload_background_image(
.collect();
CachedImage::sweep();
CachedGradient::sweep();
result
}