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Introduce methods for increasing and decreasing the reference

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This commit is contained in:
Gwilym Kuiper 2022-01-31 20:07:20 +00:00
parent 2a04ebd884
commit 5793d6b6ab
1 changed files with 22 additions and 16 deletions
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38
agb/src/display/background.rs
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@ -58,6 +58,26 @@ enum VRamState {
Free(u16),
}
impl VRamState {
fn increase_reference(&mut self) -> u16 {
if let VRamState::ReferenceCounted(count, _) = self {
*count += 1;
*count
} else {
panic!("Corrupted vram state");
}
}
fn decrease_reference(&mut self) -> (u16, (u16, u16)) {
if let VRamState::ReferenceCounted(count, tile_ref) = self {
*count -= 1;
(*count, *tile_ref)
} else {
panic!("Corrupted vram state");
}
}
}
enum ArenaStorageItem<T> {
EndOfFreeList,
NextFree(usize),
@ -141,15 +161,7 @@ impl<'a> VRamManager<'a> {
fn add_tile(&mut self, tile_set_ref: TileSetReference, tile: u16) -> TileIndex {
let tile_ref = (tile_set_ref.id, tile);
if let Some(&reference) = self.tile_set_to_vram.get(&tile_ref) {
if let VRamState::ReferenceCounted(count, tile_ref) =
self.references[reference as usize]
{
self.references[reference as usize] =
VRamState::ReferenceCounted(count + 1, tile_ref);
} else {
panic!("Corrupted tile reference state");
}
self.references[reference as usize].increase_reference();
return TileIndex(reference as u16);
}
@ -200,13 +212,7 @@ impl<'a> VRamManager<'a> {
fn remove_tile(&mut self, tile_index: TileIndex) {
let index = tile_index.0 as usize;
let (new_count, tile_ref) = match self.references[index] {
VRamState::ReferenceCounted(count, tile_ref) => {
self.references[index] = VRamState::ReferenceCounted(count - 1, tile_ref);
(count - 1, tile_ref)
}
_ => panic!("Corrupted tile reference state"),
};
let (new_count, tile_ref) = self.references[index].decrease_reference();
if new_count != 0 {
return;