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use std::{borrow::Borrow, cmp::Reverse};
use crate::{
geometry::Rect,
types::{Bucket, InputItem, OutputItem, PackOutput},
};
#[derive(Debug, Clone)]
pub struct SimplePacker {
min_size: (u32, u32),
max_size: (u32, u32),
padding: u32,
}
impl Default for SimplePacker {
fn default() -> Self {
Self::new()
}
}
impl SimplePacker {
pub fn new() -> Self {
Self {
min_size: (128, 128),
max_size: (1024, 1024),
padding: 0,
}
}
pub fn min_size(self, min_size: (u32, u32)) -> Self {
Self { min_size, ..self }
}
pub fn max_size(self, max_size: (u32, u32)) -> Self {
Self { max_size, ..self }
}
pub fn padding(self, padding: u32) -> Self {
Self { padding, ..self }
}
pub fn pack<Iter, Item>(&self, items: Iter) -> PackOutput
where
Iter: IntoIterator<Item = Item>,
Item: Borrow<InputItem>,
{
let mut remaining_items: Vec<_> = items.into_iter().map(|item| *item.borrow()).collect();
remaining_items.sort_by_key(|input| Reverse(input.area()));
for item in &mut remaining_items {
item.size = (item.size.0 + self.padding, item.size.1 + self.padding);
}
let num_items = remaining_items.len();
log::trace!("Packing {} items", num_items);
let mut buckets = Vec::new();
while !remaining_items.is_empty() {
let mut current_size = self.min_size;
loop {
let (bucket, next_remaining) =
Self::pack_one_bucket(&remaining_items, current_size);
if next_remaining.is_empty() {
buckets.push(bucket);
remaining_items = next_remaining;
break;
}
if current_size.0 < self.max_size.0 || current_size.1 < self.max_size.1 {
current_size = (
(current_size.0 * 2).min(self.max_size.0),
(current_size.1 * 2).min(self.max_size.1),
);
} else {
buckets.push(bucket);
remaining_items = next_remaining;
break;
}
}
}
for bucket in &mut buckets {
for item in &mut bucket.items {
item.rect.size = (
item.rect.size.0 - self.padding,
item.rect.size.1 - self.padding,
);
}
}
log::trace!(
"Finished packing {} items into {} buckets",
num_items,
buckets.len()
);
PackOutput { buckets }
}
fn pack_one_bucket(
remaining_items: &[InputItem],
bucket_size: (u32, u32),
) -> (Bucket, Vec<InputItem>) {
log::trace!(
"Trying to pack {} remaining items into bucket of size {:?}",
remaining_items.len(),
bucket_size
);
let mut anchors = vec![(0, 0)];
let mut items: Vec<OutputItem> = Vec::new();
let mut unpacked_items = Vec::new();
for input_item in remaining_items {
log::trace!(
"For item {:?} ({}x{}), evaluating these anchors: {:?}",
input_item.id(),
input_item.size.0,
input_item.size.1,
anchors
);
let fit_anchor = anchors.iter().copied().position(|anchor| {
let potential_rect = Rect {
pos: anchor,
size: input_item.size,
};
let fits_with_others = items
.iter()
.all(|packed_item| !potential_rect.intersects(&packed_item.rect));
let max = potential_rect.max();
let fits_in_bucket = max.0 < bucket_size.0 && max.1 < bucket_size.1;
fits_with_others && fits_in_bucket
});
if let Some(index) = fit_anchor {
let anchor = anchors.remove(index);
log::trace!("Fit at anchor {:?}", anchor);
let new_anchor_hor = (anchor.0 + input_item.size.0, anchor.1);
if new_anchor_hor.0 < bucket_size.0 && new_anchor_hor.1 < bucket_size.1 {
anchors.push(new_anchor_hor);
}
let new_anchor_ver = (anchor.0, anchor.1 + input_item.size.1);
if new_anchor_ver.0 < bucket_size.0 && new_anchor_ver.1 < bucket_size.1 {
anchors.push(new_anchor_ver);
}
let output_item = OutputItem {
id: input_item.id(),
rect: Rect {
pos: anchor,
size: input_item.size,
},
};
items.push(output_item);
} else {
log::trace!("Did not fit in this bucket.");
unpacked_items.push(*input_item);
}
}
let bucket = Bucket {
size: bucket_size,
items,
};
(bucket, unpacked_items)
}
}