493c36ac71
Instead of trimming unconditionally at the end of a frame, we now trim the cache only when there is a cache miss. This way, images that are not visible but still a part of the layout will stay cached. Eviction will only happen when the images are not a part of the UI for two consectuive frames.
73 lines
1.7 KiB
Rust
73 lines
1.7 KiB
Rust
use guillotiere::{AtlasAllocator, Size};
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pub struct Allocator {
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raw: AtlasAllocator,
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allocations: usize,
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}
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impl Allocator {
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pub fn new(size: u32) -> Allocator {
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let raw = AtlasAllocator::new(Size::new(size as i32, size as i32));
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Allocator {
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raw,
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allocations: 0,
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}
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}
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pub fn allocate(&mut self, width: u32, height: u32) -> Option<Region> {
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let allocation =
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self.raw.allocate(Size::new(width as i32, height as i32))?;
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self.allocations += 1;
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Some(Region { allocation })
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}
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pub fn deallocate(&mut self, region: &Region) {
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self.raw.deallocate(region.allocation.id);
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self.allocations = self.allocations.saturating_sub(1);
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}
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pub fn is_empty(&self) -> bool {
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self.allocations == 0
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}
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pub fn allocations(&self) -> usize {
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self.allocations
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}
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}
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pub struct Region {
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allocation: guillotiere::Allocation,
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}
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impl Region {
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pub fn position(&self) -> (u32, u32) {
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let rectangle = &self.allocation.rectangle;
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(rectangle.min.x as u32, rectangle.min.y as u32)
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}
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pub fn size(&self) -> crate::core::Size<u32> {
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let size = self.allocation.rectangle.size();
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crate::core::Size::new(size.width as u32, size.height as u32)
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}
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}
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impl std::fmt::Debug for Allocator {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "Allocator")
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}
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}
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impl std::fmt::Debug for Region {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.debug_struct("Region")
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.field("id", &self.allocation.id)
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.field("rectangle", &self.allocation.rectangle)
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.finish()
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}
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}
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