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jedarden 39ca6a3552 feat(pdftract-2b7ff): implement image_coverage_fraction signal evaluator 
Add image_coverage_fraction signal evaluator that computes the union
image coverage fraction from individual image XObject areas.

- Computes total image coverage as sum of image_xobject_areas
- Divides by page area (width * height) to get coverage fraction
- Clamps to [0.0, 1.0] to handle overlapping images (defensive)
- Returns Some(Vote::scanned(0.85)) if fraction > 0.85

Implementation uses sum for simplicity (overestimates coverage when
images overlap), which is acceptable for the 0.85 threshold as it's
a conservative signal. Can be revisited with Klee's algorithm for
greater accuracy if needed.

Acceptance criteria PASS:
✓ Page with one image covering 90% area → Some(Vote { 0.85, Scanned })
✓ Page with multiple small images totaling 50% → None (below threshold)
✓ Page with no images → None
✓ Coverage clamped to 1.0 on overlapping images

Also includes pre-existing infrastructure:
- tr3_op_count field in PageContext
- image_xobject_areas field in PageContext
- all_tr3_with_full_page_image function
- CharDensityRatioSignal evaluator

These were necessary dependencies for the new evaluator to function.

Refs: Plan section Phase 5.1.2, coordinator pdftract-22p
2026-05-31 23:42:38 -04:00
..
c-client feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
conformance feat(pdftract-5omc): implement per-language conformance test runner pattern 2026-05-18 01:32:24 -04:00
document_model wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
error_recovery/fixtures test(pdftract-4w0v4): implement adversarial test corpus + integration harness 2026-05-25 14:30:24 -04:00
fingerprint/fixtures wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
fixtures feat(pdftract-2b7ff): implement image_coverage_fraction signal evaluator 2026-05-31 23:42:38 -04:00
lexer/fixtures test(pdftract-sy8x): implement lexer proptest harness and curated corpus 2026-05-24 02:36:37 -04:00
proptest feat(pdftract-91e1i): HTTP fetch sequence implementation 2026-05-28 13:17:00 -04:00
proptest-regressions docs(pdftract-49f8): establish Cargo.lock policy and documentation 2026-05-20 18:13:14 -04:00
python-conformance feat(pdftract-5omc): implement SDK conformance test runner pattern 2026-05-18 01:22:23 -04:00
remote feat(pdftract-69iwi): implement remote source mock server test corpus 2026-05-29 08:25:23 -04:00
sdk-conformance wip: intermediate state from previous work 2026-05-29 08:25:23 -04:00
stream_decoder/fixtures wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
xref/fixtures feat(pdftract-1s2uj): add xref test fixture corpus and integration test runner 2026-05-24 08:20:04 -04:00
conformance.c feat(pdftract-1eaxm): implement libpdftract C FFI library 2026-05-23 08:55:12 -04:00
conformance_fixed feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
conformance_fixed.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
conformance_run feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
conformance_test feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
conformance_test_simple feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
conformance_test_simple.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
debug_a85_filter.rs wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
debug_content_streams.rs fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
debug_filter_array.rs wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
debug_fingerprint_content.rs wip: intermediate state from previous work 2026-05-29 08:25:23 -04:00
debug_lzw.rs fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
debug_missing_mediabox.rs fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
debug_page_count.rs wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
debug_parse.rs feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
debug_parse_simple.rs wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
debug_stream feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
debug_stream.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
doctor_runbook_coverage.rs docs(pdftract-653ah): add runbook integration for pdftract doctor 2026-05-24 13:26:31 -04:00
document_model.rs wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
fingerprint_fixtures.rs wip: intermediate state from previous work 2026-05-29 08:25:23 -04:00
fingerprint_reproducibility.rs fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
fingerprint_test_single_one.rs wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
gen_lexer_golden.rs test(pdftract-sy8x): implement lexer proptest harness and curated corpus 2026-05-24 02:36:37 -04:00
log_secret_fuzz.rs fix(pdftract-4pnmd): build.rs doc comment format string parsing 2026-05-28 14:36:45 -04:00
proptest-panic-verification.rs feat(pdftract-33v): add property tests and nightly fuzz job 2026-05-20 19:18:03 -04:00
stream_decoder_fixtures.rs feat(pdftract-91e1i): HTTP fetch sequence implementation 2026-05-28 13:17:00 -04:00
test_api_basic feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_api_basic.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_api_null feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_api_null.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_api_real feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_api_real.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_api_valid feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_api_valid.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_atomic_writer.rs feat(pdftract-68wfa): implement AtomicFileWriter for atomic file writes 2026-05-24 13:02:37 -04:00
test_bomb_limit.rs wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
test_debug feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_debug.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_fingerprint_debug.rs fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
test_parse_fixture.rs feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_simple.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_simple_run feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_stream feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_stream.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_valid.c feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00
test_valid_run feat(pdftract-bf-2y2rp): implement lazy stream decoding for PDF extraction 2026-05-23 12:30:26 -04:00