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use crate::brush_stroke::BrushStroke;
use crate::brush_stroke::BrushStyle;
use dyn_any::DynAny;
use graphene_core::instances::Instance;
use graphene_core::raster_types::CPU;
use graphene_core::raster_types::Raster;
use std::collections::HashMap;
use std::hash::Hash;
use std::sync::Arc;
use std::sync::Mutex;
#[derive(Clone, Debug, PartialEq, DynAny, Default, serde::Serialize, serde::Deserialize)]
struct BrushCacheImpl {
// The full previous input that was cached.
prev_input: Vec<BrushStroke>,
// The strokes that have been fully processed and blended into the background.
#[serde(deserialize_with = "graphene_core::raster::image::migrate_image_frame_instance")]
background: Instance<Raster<CPU>>,
#[serde(deserialize_with = "graphene_core::raster::image::migrate_image_frame_instance")]
blended_image: Instance<Raster<CPU>>,
#[serde(deserialize_with = "graphene_core::raster::image::migrate_image_frame_instance")]
last_stroke_texture: Instance<Raster<CPU>>,
// A cache for brush textures.
#[serde(skip)]
brush_texture_cache: HashMap<BrushStyle, Raster<CPU>>,
}
impl BrushCacheImpl {
fn compute_brush_plan(&mut self, mut background: Instance<Raster<CPU>>, input: &[BrushStroke]) -> BrushPlan {
// Do background invalidation.
if background != self.background {
self.background = background.clone();
return BrushPlan {
strokes: input.to_vec(),
background,
..Default::default()
};
}
// Do blended_image invalidation.
let blended_strokes = &self.prev_input[..self.prev_input.len().saturating_sub(1)];
let num_blended_strokes = blended_strokes.len();
if input.get(..num_blended_strokes) != Some(blended_strokes) {
return BrushPlan {
strokes: input.to_vec(),
background,
..Default::default()
};
}
// Take our previous blended image (and invalidate the cache).
// Since we're about to replace our cache anyway, this saves a clone.
background = std::mem::take(&mut self.blended_image);
// Check if the first non-blended stroke is an extension of the last one.
let mut first_stroke_texture = Instance {
instance: Raster::<CPU>::default(),
transform: glam::DAffine2::ZERO,
..Default::default()
};
let mut first_stroke_point_skip = 0;
let strokes = input[num_blended_strokes..].to_vec();
if !strokes.is_empty() && self.prev_input.len() > num_blended_strokes {
let last_stroke = &self.prev_input[num_blended_strokes];
let same_style = strokes[0].style == last_stroke.style;
let prev_points = last_stroke.compute_blit_points();
let new_points = strokes[0].compute_blit_points();
let is_point_prefix = new_points.get(..prev_points.len()) == Some(&prev_points);
if same_style && is_point_prefix {
first_stroke_texture = std::mem::take(&mut self.last_stroke_texture);
first_stroke_point_skip = prev_points.len();
}
}
self.prev_input = Vec::new();
BrushPlan {
strokes,
background,
first_stroke_texture,
first_stroke_point_skip,
}
}
pub fn cache_results(&mut self, input: Vec<BrushStroke>, blended_image: Instance<Raster<CPU>>, last_stroke_texture: Instance<Raster<CPU>>) {
self.prev_input = input;
self.blended_image = blended_image;
self.last_stroke_texture = last_stroke_texture;
}
}
impl Hash for BrushCacheImpl {
// Zero hash.
fn hash<H: std::hash::Hasher>(&self, _state: &mut H) {}
}
#[derive(Clone, Debug, Default)]
pub struct BrushPlan {
pub strokes: Vec<BrushStroke>,
pub background: Instance<Raster<CPU>>,
pub first_stroke_texture: Instance<Raster<CPU>>,
pub first_stroke_point_skip: usize,
}
#[derive(Debug, DynAny, serde::Serialize, serde::Deserialize)]
pub struct BrushCache {
inner: Arc<Mutex<BrushCacheImpl>>,
proto: bool,
}
impl Default for BrushCache {
fn default() -> Self {
Self::new_proto()
}
}
// A bit of a cursed implementation to work around the current node system.
// The original object is a 'prototype' that when cloned gives you a independent
// new object. Any further clones however are all the same underlying cache object.
impl Clone for BrushCache {
fn clone(&self) -> Self {
if self.proto {
let inner_val = self.inner.lock().unwrap();
Self {
inner: Arc::new(Mutex::new(inner_val.clone())),
proto: false,
}
} else {
Self {
inner: Arc::clone(&self.inner),
proto: false,
}
}
}
}
impl PartialEq for BrushCache {
fn eq(&self, other: &Self) -> bool {
if Arc::ptr_eq(&self.inner, &other.inner) {
return true;
}
let s = self.inner.lock().unwrap();
let o = other.inner.lock().unwrap();
*s == *o
}
}
impl Hash for BrushCache {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.inner.lock().unwrap().hash(state);
}
}
impl BrushCache {
pub fn new_proto() -> Self {
Self {
inner: Default::default(),
proto: true,
}
}
pub fn compute_brush_plan(&self, background: Instance<Raster<CPU>>, input: &[BrushStroke]) -> BrushPlan {
let mut inner = self.inner.lock().unwrap();
inner.compute_brush_plan(background, input)
}
pub fn cache_results(&self, input: Vec<BrushStroke>, blended_image: Instance<Raster<CPU>>, last_stroke_texture: Instance<Raster<CPU>>) {
let mut inner = self.inner.lock().unwrap();
inner.cache_results(input, blended_image, last_stroke_texture)
}
pub fn get_cached_brush(&self, style: &BrushStyle) -> Option<Raster<CPU>> {
let inner = self.inner.lock().unwrap();
inner.brush_texture_cache.get(style).cloned()
}
pub fn store_brush(&self, style: BrushStyle, brush: Raster<CPU>) {
let mut inner = self.inner.lock().unwrap();
inner.brush_texture_cache.insert(style, brush);
}
}
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