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Image Trace: an oversized image decodes within the allocation its 192 megapixel limit needs (512 MB on the web)

This commit is contained in:
bflatastic 2026-10-12 08:23:19 +07:00
parent e1fe2e388b
commit ae5fa87d9d
1 changed files with 7 additions and 1 deletions
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8
crates/trace/src/lib.rs
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@ -149,7 +149,13 @@ impl Raster {
if pixels > MAX_SOURCE_PIXELS {
return Err(TraceError::TooLarge { width: w, height: h, max: MAX_SOURCE_PIXELS >> 20 });
}
let img = image::load_from_memory(bytes).map_err(decode_err)?.to_rgba8();
// Decoded within the allocation the source limit needs; the web keeps file import's 512 MB.
// A deeper image (16 bits a channel) that needs more fails with a decode error.
let mut reader = image::ImageReader::new(std::io::Cursor::new(bytes)).with_guessed_format().map_err(|e| TraceError::Decode(e.to_string()))?;
let mut limits = image::Limits::default();
limits.max_alloc = Some(if cfg!(target_arch = "wasm32") { 512 << 20 } else { MAX_SOURCE_PIXELS * 4 });
reader.limits(limits);
let img = reader.decode().map_err(decode_err)?.into_rgba8();
let (w, h) = img.dimensions();
let (nw, nh) = fit_size(w, h, MAX_PIXELS);
// Box-filtered: every source pixel counts, so thin lines and anti-aliased edges survive.