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|
use guillotiere::{AtlasAllocator, Size};
pub struct Allocator {
raw: AtlasAllocator,
size: u32,
}
impl Allocator {
const PADDING: u32 = 1;
pub fn new(size: u32) -> Allocator {
let raw = AtlasAllocator::new(Size::new(size as i32, size as i32));
Allocator { raw, size }
}
pub fn allocate(&mut self, width: u32, height: u32) -> Option<Region> {
let padding = (
if width + Self::PADDING * 2 < self.size {
Self::PADDING
} else {
0
},
if height + Self::PADDING * 2 < self.size {
Self::PADDING
} else {
0
},
);
let allocation = self.raw.allocate(Size::new(
(width + padding.0 * 2) as i32,
(height + padding.1 * 2) as i32,
))?;
Some(Region {
allocation,
padding,
})
}
pub fn deallocate(&mut self, region: Region) {
self.raw.deallocate(region.allocation.id);
}
}
pub struct Region {
allocation: guillotiere::Allocation,
padding: (u32, u32),
}
impl Region {
pub fn position(&self) -> (u32, u32) {
let rectangle = &self.allocation.rectangle;
(
rectangle.min.x as u32 + self.padding.0,
rectangle.min.y as u32 + self.padding.1,
)
}
pub fn size(&self) -> (u32, u32) {
let size = self.allocation.rectangle.size();
(
size.width as u32 - self.padding.0 * 2,
size.height as u32 - self.padding.1 * 2,
)
}
}
impl std::fmt::Debug for Allocator {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "Allocator")
}
}
impl std::fmt::Debug for Region {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Region")
.field("id", &self.allocation.id)
.field("rectangle", &self.allocation.rectangle)
.field("padding", &self.padding)
.finish()
}
}
|
