mirror of
https://github.com/storytold/pdfcraft.git
synced 2026-11-12 00:42:56 +00:00
503 lines
20 KiB
Rust
503 lines
20 KiB
Rust
//! Image resampling and recompression.
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use std::collections::{HashMap, HashSet};
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use pdfcraft_content::{Matrix, Pieces};
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use pdfcraft_cos::{DecodeBudget, Dict, Document, ObjRef, Object, Stream};
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use crate::{Compression, ImageSettings, OptimizeError, Report, Settings, Stage};
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/// Images with more pixels than this are left alone (memory).
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const MAX_PIXELS: u64 = 80_000_000;
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/// The resources of a page, inherited from the page tree if the page has none.
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pub(crate) fn page_resources(doc: &Document, page: ObjRef) -> Option<Dict> {
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let mut node = Some(page);
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for _ in 0..64 {
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let d = doc.get(node?).as_dict()?.clone();
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if let Some(r) = d.get(b"Resources") {
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return doc.resolve(r).as_dict().cloned();
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}
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node = d.reference(b"Parent");
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}
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None
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}
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/// The page content `contents` names, decoded against `budget` and joined. `None` when a stream
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/// doesn't decode or the budget runs out: the content is not all known.
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pub(crate) fn content_bytes(doc: &Document, contents: &Object, budget: &mut DecodeBudget) -> Option<Vec<u8>> {
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let pieces = budget.decode_contents(doc, contents).into_iter().collect::<Result<Vec<_>, _>>().ok()?;
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Some(Pieces::join(&pieces).data().to_vec())
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}
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/// Forms nested deeper than this aren't followed.
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const MAX_FORM_DEPTH: usize = 12;
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/// Walks of a form already walked once (other scale or caller) before the measurement gives up.
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/// Each form's first walk is free: their number is bounded by the file's object count.
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const MAX_REWALKS: usize = 100_000;
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/// State of one [`effective_resolutions`] pass.
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struct Walk<'a> {
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doc: &'a Document,
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/// The forms being walked right now, outermost first: a form drawing one of these is a cycle.
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path: Vec<ObjRef>,
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/// Forms with their own resources already walked, by the linear part of their matrix. Drawing
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/// one again at the same scale (only moved) can't change any image's resolution.
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walked: HashSet<(ObjRef, [u64; 4])>,
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/// Forms walked at least once.
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seen: HashSet<ObjRef>,
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rewalks: usize,
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/// Decoded bytes left for the page being walked.
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budget: DecodeBudget,
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/// False once a use may have been missed (depth or work limit).
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complete: bool,
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out: HashMap<ObjRef, f64>,
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}
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impl Walk<'_> {
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/// Walk one content stream, recording each image's displayed resolution (pixels per inch, the
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/// smaller of the two axes) and descending into form XObjects.
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fn content(&mut self, data: &[u8], resources: &Dict, ctm: Matrix) {
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let doc = self.doc;
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let xobjects = resources.get(b"XObject").map(|x| doc.resolve(x)).and_then(|x| x.as_dict().cloned()).unwrap_or_default();
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let mut stack = vec![ctm];
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for op in pdfcraft_content::parse(data).ops {
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let top = stack.last().copied().unwrap_or(ctm);
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match op.op.as_slice() {
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b"q" => stack.push(top),
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b"Q" if stack.len() > 1 => {
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stack.pop();
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}
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b"cm" => {
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if let Some(m) = Matrix::from_operands(&op.operands)
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&& let Some(t) = stack.last_mut()
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{
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*t = m.then(&top);
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}
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}
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b"Do" => {
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let Some(name) = op.name(0) else { continue };
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let Some(r) = xobjects.get(name).and_then(Object::as_ref) else { continue };
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let obj = doc.get(r);
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let Object::Stream(s) = &*obj else { continue };
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match s.dict.name(b"Subtype") {
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Some(b"Image") => {
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let (w, h) = (s.dict.int(b"Width").unwrap_or(0) as f64, s.dict.int(b"Height").unwrap_or(0) as f64);
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let [a, b, c, d, ..] = top.0;
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let (sx, sy) = ((a * a + b * b).sqrt(), (c * c + d * d).sqrt());
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if w > 0.0 && h > 0.0 && sx > 1e-6 && sy > 1e-6 {
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let ppi = (w / (sx / 72.0)).min(h / (sy / 72.0));
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let e = self.out.entry(r).or_insert(f64::INFINITY);
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*e = e.min(ppi);
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}
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}
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Some(b"Form") => self.form(r, s, resources, top),
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_ => {}
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}
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}
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_ => {}
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}
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}
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}
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/// Descend into form `r` drawn with `ctm` from a stream whose resources are `resources`.
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fn form(&mut self, r: ObjRef, s: &Stream, resources: &Dict, ctm: Matrix) {
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if self.path.contains(&r) {
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return;
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}
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if self.path.len() >= MAX_FORM_DEPTH {
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self.complete = false;
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return;
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}
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let doc = self.doc;
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let m = s.dict.get(b"Matrix").map(|m| doc.resolve(m)).and_then(|m| m.as_array().map(|a| Matrix::from_operands(a))).flatten();
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let inner = m.unwrap_or(Matrix([1.0, 0.0, 0.0, 1.0, 0.0, 0.0])).then(&ctm);
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let own = s.dict.get(b"Resources").map(|r| doc.resolve(r)).and_then(|r| r.as_dict().cloned());
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// A form without resources uses its caller's, so the same form can draw other images.
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if own.is_some() {
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let [a, b, c, d, ..] = inner.0;
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if !self.walked.insert((r, [a.to_bits(), b.to_bits(), c.to_bits(), d.to_bits()])) {
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return;
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}
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}
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if !self.seen.insert(r) {
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if self.rewalks >= MAX_REWALKS {
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self.complete = false;
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return;
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}
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self.rewalks += 1;
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}
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if !self.budget.enter_form() {
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self.complete = false;
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return;
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}
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let Ok(data) = self.budget.decode(s) else {
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self.complete = false;
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return;
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};
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self.path.push(r);
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self.content(&data, own.as_ref().unwrap_or(resources), inner);
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self.path.pop();
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}
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}
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/// The effective resolution (ppi) of every image drawn by `pages`: the smallest over its uses.
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///
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/// If forms nest too deeply, are drawn too many times, or a page's content doesn't decode within
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/// its budget, every image is given `INFINITY` (never resampled), since its largest use may be
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/// among those missed.
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pub fn effective_resolutions(doc: &Document, pages: &[ObjRef]) -> HashMap<ObjRef, f64> {
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let mut walk = Walk {
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doc,
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path: Vec::new(),
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walked: HashSet::new(),
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seen: HashSet::new(),
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rewalks: 0,
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budget: DecodeBudget::page(),
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complete: true,
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out: HashMap::new(),
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};
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for p in pages {
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let Some(d) = doc.get(*p).as_dict().cloned() else { continue };
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let Some(contents) = d.get(b"Contents") else { continue };
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let res = page_resources(doc, *p).unwrap_or_default();
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walk.budget = DecodeBudget::page();
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let Some(data) = content_bytes(doc, contents, &mut walk.budget) else {
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walk.complete = false;
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continue;
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};
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walk.content(&data, &res, Matrix([1.0, 0.0, 0.0, 1.0, 0.0, 0.0]));
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}
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if !walk.complete {
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walk.out.values_mut().for_each(|v| *v = f64::INFINITY);
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}
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walk.out
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}
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/// Colour components of a colour space PdfCraft resamples: gray (1) or RGB (3).
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pub(crate) fn components(doc: &Document, cs: &Object) -> Option<usize> {
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let cs = doc.resolve(cs);
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match &*cs {
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Object::Name(n) => match n.as_slice() {
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b"DeviceGray" | b"G" => Some(1),
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b"DeviceRGB" | b"RGB" => Some(3),
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_ => None,
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},
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Object::Array(a) => match a.first()?.as_name()? {
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b"ICCBased" => match &*doc.resolve(a.get(1)?) {
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Object::Stream(icc) => match icc.dict.int(b"N")? {
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1 => Some(1),
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3 => Some(3),
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_ => None,
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},
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_ => None,
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},
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b"CalGray" => Some(1),
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b"CalRGB" => Some(3),
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_ => None,
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},
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_ => None,
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}
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}
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fn is_dct(s: &Stream) -> Option<bool> {
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match s.dict.get(b"Filter") {
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None => Some(false),
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Some(Object::Name(n)) => match n.as_slice() {
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b"DCTDecode" | b"DCT" => Some(true),
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b"FlateDecode" | b"Fl" | b"LZWDecode" | b"LZW" | b"RunLengthDecode" | b"RL" | b"ASCII85Decode" | b"A85" | b"ASCIIHexDecode" | b"AHx" => {
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Some(false)
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}
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_ => None,
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},
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Some(Object::Array(a)) => {
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let names: Vec<&[u8]> = a.iter().filter_map(Object::as_name).collect();
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if names.len() != a.len() {
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return None;
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}
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match names.as_slice() {
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[b"DCTDecode" | b"DCT"] => Some(true),
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n if n.iter().all(|f| {
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matches!(
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*f,
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b"FlateDecode"
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| b"Fl"
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| b"LZWDecode"
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| b"LZW"
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| b"RunLengthDecode"
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| b"RL"
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| b"ASCII85Decode"
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| b"A85"
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| b"ASCIIHexDecode"
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| b"AHx"
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)
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}) =>
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{
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Some(false)
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}
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_ => None,
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}
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}
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_ => None,
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}
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}
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#[cfg(test)]
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thread_local! {
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/// Pixels decoded from JPEG data, for the test that keeps a mismatched JPEG from decoding.
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static DECODED_PIXELS: std::cell::Cell<u64> = const { std::cell::Cell::new(0) };
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}
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/// Counts `n` decoded pixels (tests only).
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#[inline]
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fn count_decoded(_n: u64) {
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#[cfg(test)]
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DECODED_PIXELS.with(|c| c.set(c.get().saturating_add(_n)));
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}
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/// 8-bit samples of an image (`n` components), decoded.
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pub(crate) fn pixels(s: &Stream, n: usize) -> Option<Vec<u8>> {
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let (w, h) = (u32::try_from(s.dict.int(b"Width")?).ok()?, u32::try_from(s.dict.int(b"Height")?).ok()?);
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if w == 0 || h == 0 || u64::from(w) * u64::from(h) > MAX_PIXELS {
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return None;
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}
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let bytes = usize::try_from(w).ok()?.checked_mul(usize::try_from(h).ok()?)?.checked_mul(n)?;
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if is_dct(s)? {
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use image::ImageDecoder as _;
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// The JPEG's own size is what gets decoded: one other than the dictionary's is refused from
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// its header, before any pixels are.
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let decoder = image::codecs::jpeg::JpegDecoder::new(std::io::Cursor::new(&s.raw[..])).ok()?;
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if decoder.dimensions() != (w, h) {
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return None;
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}
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let img = image::DynamicImage::from_decoder(decoder).ok()?;
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count_decoded(u64::from(img.width()) * u64::from(img.height()));
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// Adobe CMYK/YCCK JPEGs aren't handled (the colour space check excludes them).
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let v = if n == 1 { img.into_luma8().into_raw() } else { img.into_rgb8().into_raw() };
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(v.len() == bytes).then_some(v)
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} else {
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let v = s.decoded().ok()?;
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Some(v.get(..bytes)?.to_vec())
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}
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}
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pub(crate) fn resample(px: &[u8], n: usize, w: u32, h: u32, nw: u32, nh: u32) -> Option<Vec<u8>> {
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use image::imageops::{FilterType, resize};
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Some(match n {
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1 => resize(&image::GrayImage::from_raw(w, h, px.to_vec())?, nw, nh, FilterType::CatmullRom).into_raw(),
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_ => resize(&image::RgbImage::from_raw(w, h, px.to_vec())?, nw, nh, FilterType::CatmullRom).into_raw(),
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})
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}
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fn jpeg(px: &[u8], n: usize, w: u32, h: u32, quality: u8) -> Option<Vec<u8>> {
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let mut out = Vec::new();
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let mut enc = image::codecs::jpeg::JpegEncoder::new_with_quality(&mut out, quality.clamp(1, 100));
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let ty = if n == 1 { image::ExtendedColorType::L8 } else { image::ExtendedColorType::Rgb8 };
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enc.encode(px, w, h, ty).ok()?;
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Some(out)
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}
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/// Whether [`pixels`] reads `s` as it is drawn: a codec it decodes and no decode array that
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/// changes anything. `None` when the colour space isn't grey or RGB.
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pub(crate) fn decodable(doc: &Document, s: &Stream) -> Option<bool> {
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let n = components(doc, s.dict.get(b"ColorSpace")?)?;
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Some(is_dct(s).is_some() && s.dict.get(b"Decode").is_none_or(|d| is_identity_decode(doc, d, n)))
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}
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/// Whether `decode` is the default decode array for `n` components ([0 1] each), which changes
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/// nothing. Scanners write it on page images (#490).
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fn is_identity_decode(doc: &Document, decode: &Object, n: usize) -> bool {
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let decode = doc.resolve(decode);
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let Some(a) = decode.as_array() else { return false };
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a.len() == 2 * n && a.chunks(2).all(|p| matches!(p, [lo, hi] if doc.resolve(lo).as_f64() == Some(0.0) && doc.resolve(hi).as_f64() == Some(1.0)))
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}
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/// A new image stream from 8-bit samples: the original dictionary with the new size and filter.
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/// A decode array is dropped: only images without one, or with the default one, get here.
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fn image_stream(old: &Dict, px: &[u8], n: usize, w: u32, h: u32, compression: Compression, was_dct: bool) -> Option<Stream> {
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let mut d = old.clone();
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for k in [&b"Filter"[..], b"DecodeParms", b"Decode", b"Length", b"DL"] {
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d.remove(k);
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}
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d.set(b"Width".to_vec(), Object::Int(w as i64));
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d.set(b"Height".to_vec(), Object::Int(h as i64));
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d.set(b"BitsPerComponent".to_vec(), Object::Int(8));
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let use_jpeg = match compression {
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Compression::Jpeg(_) => true,
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Compression::Flate => false,
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Compression::Retain => was_dct,
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};
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if use_jpeg {
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let q = match compression {
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Compression::Jpeg(q) => q,
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_ => 80,
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};
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let data = jpeg(px, n, w, h, q)?;
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d.set(b"Filter".to_vec(), Object::name("DCTDecode"));
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Some(Stream::from_raw(d, data))
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} else {
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Some(Stream::flate(d, px))
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}
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}
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/// One image: resample and/or recompress per `settings`; `ppi` is its effective resolution.
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/// Returns the new image and its new soft mask, if the result is smaller.
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fn process(doc: &Document, s: &Stream, ppi: f64, settings: &ImageSettings, n: usize) -> Option<(Stream, Option<(ObjRef, Stream)>)> {
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let d = &s.dict;
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if d.get(b"Decode").is_some_and(|a| !is_identity_decode(doc, a, n))
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|| d.contains(b"Mask")
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|| d.name(b"ImageMask").is_some()
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|| matches!(d.get(b"ImageMask"), Some(Object::Bool(true)))
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{
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return None;
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}
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if d.int(b"BitsPerComponent") != Some(8) {
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return None;
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}
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let was_dct = is_dct(s)?;
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let (w, h) = (u32::try_from(d.int(b"Width")?).ok()?, u32::try_from(d.int(b"Height")?).ok()?);
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if w == 0 || h == 0 || (w as u64) * (h as u64) > MAX_PIXELS {
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return None;
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}
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let resize = settings.downsample && ppi.is_finite() && ppi > settings.above_ppi && settings.target_ppi > 0.0;
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let recompress = matches!(settings.compression, Compression::Jpeg(_)) || (matches!(settings.compression, Compression::Flate) && was_dct);
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if !resize && !recompress {
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return None;
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}
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// Tiny images (icons, rules) don't benefit and JPEG would blur them.
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if !resize && (w as u64) * (h as u64) < 64 * 64 {
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return None;
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}
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let (nw, nh) = if resize {
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let k = settings.target_ppi / ppi;
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(((w as f64 * k).round() as u32).max(1), ((h as f64 * k).round() as u32).max(1))
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} else {
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(w, h)
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};
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let px = pixels(s, n)?;
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let px = if (nw, nh) != (w, h) { resample(&px, n, w, h, nw, nh)? } else { px };
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let new = image_stream(d, &px, n, nw, nh, settings.compression, was_dct)?;
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// A soft mask must keep the image's dimensions: resample it with the image (lossless).
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let mut smask = None;
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if let Some(mr) = d.reference(b"SMask") {
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let mobj = doc.get(mr);
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let Object::Stream(m) = &*mobj else { return None };
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if (nw, nh) != (w, h) {
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if m.dict.int(b"BitsPerComponent") != Some(8) || m.dict.contains(b"Matte") || m.dict.contains(b"Decode") {
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return None;
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}
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let (mw, mh) = (u32::try_from(m.dict.int(b"Width")?).ok()?, u32::try_from(m.dict.int(b"Height")?).ok()?);
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let mpx = pixels(m, 1)?;
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let mpx = resample(&mpx, 1, mw, mh, nw, nh)?;
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smask = Some((mr, image_stream(&m.dict, &mpx, 1, nw, nh, Compression::Flate, false)?));
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}
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}
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let before = s.raw.len()
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+ smask.as_ref().map_or(0, |(r, _)| match &*doc.get(*r) {
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Object::Stream(m) => m.raw.len(),
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_ => 0,
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});
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let after = new.raw.len() + smask.as_ref().map_or(0, |(_, m)| m.raw.len());
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(after < before).then_some((new, smask))
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}
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pub(crate) fn run(
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doc: &mut Document,
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pages: &[ObjRef],
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settings: &Settings,
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|
report: &mut Report,
|
|
progress: &mut dyn FnMut(Stage) -> bool,
|
|
) -> Result<(), OptimizeError> {
|
|
let ppi = effective_resolutions(doc, pages);
|
|
// Soft masks are processed with their image, not on their own.
|
|
let masks: HashSet<ObjRef> = ppi
|
|
.keys()
|
|
.filter_map(|r| match &*doc.get(*r) {
|
|
Object::Stream(s) => s.dict.reference(b"SMask"),
|
|
_ => None,
|
|
})
|
|
.collect();
|
|
let mut refs: Vec<(ObjRef, f64)> = ppi.into_iter().filter(|(r, _)| !masks.contains(r)).collect();
|
|
refs.sort_by_key(|(r, _)| r.num);
|
|
let total = refs.len();
|
|
for (done, (r, ppi)) in refs.into_iter().enumerate() {
|
|
if !progress(Stage::Images { done, total }) {
|
|
return Err(OptimizeError::Cancelled);
|
|
}
|
|
let obj = doc.get(r);
|
|
let Object::Stream(s) = &*obj else { continue };
|
|
report.images += 1;
|
|
let Some(n) = s.dict.get(b"ColorSpace").and_then(|cs| components(doc, cs)) else { continue };
|
|
let st = if n == 1 { &settings.gray } else { &settings.color };
|
|
let Some((new, smask)) = process(doc, s, ppi, st, n) else { continue };
|
|
let resized = new.dict.int(b"Width") != s.dict.int(b"Width") || new.dict.int(b"Height") != s.dict.int(b"Height");
|
|
report.image_bytes_before += s.raw.len();
|
|
report.image_bytes_after += new.raw.len();
|
|
if resized {
|
|
report.images_resampled += 1;
|
|
} else {
|
|
report.images_recompressed += 1;
|
|
}
|
|
doc.set(r, Object::Stream(new));
|
|
if let Some((mr, m)) = smask {
|
|
doc.set(mr, Object::Stream(m));
|
|
}
|
|
}
|
|
if !progress(Stage::Images { done: total, total }) {
|
|
return Err(OptimizeError::Cancelled);
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod dimension_tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn pixel_reader_rejects_hostile_dimensions_before_decoding() {
|
|
for (width, height, channels) in [(-1, 1, 1), (0, 1, 1), (i64::from(u32::MAX) + 101, 1, 1), (80_000_001, 1, 1), (2, 2, usize::MAX)] {
|
|
let mut dict = Dict::new();
|
|
dict.set(b"Width".to_vec(), Object::Int(width));
|
|
dict.set(b"Height".to_vec(), Object::Int(height));
|
|
let stream = Stream::from_raw(dict, vec![0; 4]);
|
|
assert!(pixels(&stream, channels).is_none(), "{width} x {height} x {channels}");
|
|
}
|
|
let mut dict = Dict::new();
|
|
dict.set(b"Width".to_vec(), Object::Int(2));
|
|
dict.set(b"Height".to_vec(), Object::Int(2));
|
|
let stream = Stream::from_raw(dict, vec![1, 2, 3, 4, 5]);
|
|
assert_eq!(pixels(&stream, 1), Some(vec![1, 2, 3, 4]));
|
|
}
|
|
|
|
/// A JPEG larger than its dictionary says is refused from its header, before its pixels are decoded.
|
|
#[test]
|
|
fn a_jpeg_of_another_size_than_its_dictionary_is_not_decoded() {
|
|
let data = jpeg(&vec![128; 1000 * 1000], 1, 1000, 1000, 50).unwrap_or_default();
|
|
let stream = |w: i64, h: i64| {
|
|
let mut dict = Dict::new();
|
|
dict.set(b"Width".to_vec(), Object::Int(w));
|
|
dict.set(b"Height".to_vec(), Object::Int(h));
|
|
dict.set(b"Filter".to_vec(), Object::name("DCTDecode"));
|
|
Stream::from_raw(dict, data.clone())
|
|
};
|
|
DECODED_PIXELS.with(|c| c.set(0));
|
|
assert!(pixels(&stream(10, 10), 1).is_none());
|
|
assert_eq!(DECODED_PIXELS.with(|c| c.get()), 0, "pixels decoded");
|
|
assert_eq!(pixels(&stream(1000, 1000), 1).map(|p| p.len()), Some(1000 * 1000));
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use pdfcraft_cos::{DecodeBudget, Dict, Document, MAX_PAGE_DECODED, Object, Stream};
|
|
|
|
#[test]
|
|
fn repeated_content_references_share_one_decode_budget() {
|
|
let mut doc = Document::new_empty();
|
|
let stream = doc.add(Stream::flate(Dict::new(), &vec![b' '; 1 << 20]));
|
|
let contents = Object::Array(vec![Object::Ref(stream); 300]);
|
|
let data = super::content_bytes(&doc, &contents, &mut DecodeBudget::page());
|
|
assert!(data.is_none_or(|d| d.len() <= MAX_PAGE_DECODED + 300));
|
|
}
|
|
}
|