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minedmap: skip generation steps when the inputs are unchanged

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This commit is contained in:
Matthias Schiffer 2023-07-31 00:23:06 +02:00
parent 6077138292
commit 80781c9c20
Signed by: neocturne
GPG key ID: 16EF3F64CB201D9C
4 changed files with 97 additions and 50 deletions
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38
src/bin/minedmap/tile_mipmapper.rs
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@ -49,17 +49,7 @@ impl<'a> TileMipmapper<'a> {
const N: u32 = (BLOCKS_PER_CHUNK * CHUNKS_PER_REGION) as u32;
let output_path = self.config.tile_path(kind, level, coords);
println!(
"Rendering mipmap tile {}",
output_path
.strip_prefix(&self.config.output_dir)
.expect("tile path must be in output directory")
.display(),
);
let mut image: image::DynamicImage =
image::ImageBuffer::<P, Vec<P::Subpixel>>::new(N, N).into();
let output_timestamp = fs::read_timestamp(&output_path, FILE_META_VERSION);
let sources: Vec<_> = [(0, 0), (0, 1), (1, 0), (1, 1)]
.into_iter()
@ -84,10 +74,32 @@ impl<'a> TileMipmapper<'a> {
})
.collect();
let Some(timestamp) = sources.iter().map(|(_, _, ts)| *ts).max() else {
let Some(input_timestamp) = sources.iter().map(|(_, _, ts)| *ts).max() else {
return Ok(());
};
if Some(input_timestamp) <= output_timestamp {
println!(
"Skipping unchanged mipmap tile {}",
output_path
.strip_prefix(&self.config.output_dir)
.expect("tile path must be in output directory")
.display(),
);
return Ok(());
}
println!(
"Rendering mipmap tile {}",
output_path
.strip_prefix(&self.config.output_dir)
.expect("tile path must be in output directory")
.display(),
);
let mut image: image::DynamicImage =
image::ImageBuffer::<P, Vec<P::Subpixel>>::new(N, N).into();
for ((dx, dz), source_path, _) in sources {
let source = match image::open(&source_path) {
Ok(source) => source,
@ -109,7 +121,7 @@ impl<'a> TileMipmapper<'a> {
);
}
fs::create_with_timestamp(&output_path, FILE_META_VERSION, timestamp, |file| {
fs::create_with_timestamp(&output_path, FILE_META_VERSION, input_timestamp, |file| {
image
.write_to(file, image::ImageFormat::Png)
.context("Failed to save image")