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pdftract/crates/pdftract-core/src
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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
..
annotation feat(pdftract-91e1i): HTTP fetch sequence implementation 2026-05-28 13:17:00 -04:00
attachment feat(pdftract-3j2u): implement 50 MB size limit + base64 encoding for attachments 2026-05-25 11:42:28 -04:00
cache fix(pdftract-2uk9z): wrap native module results in typed Python objects 2026-05-28 21:18:38 -04:00
cmap feat(pdftract-19oy): codespace range parser + multi-byte tokenizer 2026-05-28 12:26:25 -04:00
decoder feat(pdftract-36glh): implement JPXDecode passthrough with JP2 validation 2026-05-28 05:11:19 -04:00
encryption fix(pdftract-2uk9z): wrap native module results in typed Python objects 2026-05-28 21:18:38 -04:00
fingerprint feat(pdftract-91e1i): HTTP fetch sequence implementation 2026-05-28 13:17:00 -04:00
font wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
forms fix(pdftract-5t92): fix choice value extraction test failures 2026-05-31 14:00:59 -04:00
glyph fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
layout wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
ocr/preprocessing feat(pdftract-3h9xo): implement threads JSON output + schema integration 2026-05-25 13:40:15 -04:00
output docs(pdftract-1t5sj): verify book_chapter profile implementation complete 2026-05-27 22:38:46 -04:00
parser wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
profiles feat(profiles): add profile infrastructure and initial fixtures 2026-05-31 15:10:51 -04:00
receipts fix(pdftract-4pnmd): build.rs doc comment format string parsing 2026-05-28 14:36:45 -04:00
render feat(pdftract-3s2i): implement Phase 5.5.2 validation filter 2026-05-24 04:57:17 -04:00
schema fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
signature feat(pdftract-3s2i): implement Phase 5.5.2 validation filter 2026-05-24 04:57:17 -04:00
source fix(pdftract-4pnmd): build.rs doc comment format string parsing 2026-05-28 14:36:45 -04:00
span fix(pdftract-37qim): fix span compilation errors, verify multi-output CLI parsing 2026-05-28 01:29:07 -04:00
table fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
threads feat(pdftract-4li3d): implement security constraints for serve mode 2026-05-26 18:47:51 -04:00
atomic_file_writer.rs feat(pdftract-68wfa): implement AtomicFileWriter for atomic file writes 2026-05-24 13:02:37 -04:00
audit.rs fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
classify.rs feat(pdftract-2b7ff): implement image_coverage_fraction signal evaluator 2026-05-31 23:42:38 -04:00
confidence.rs fix(pdftract-2uk9z): wrap native module results in typed Python objects 2026-05-28 21:18:38 -04:00
conformance.rs fix(pdftract-25igv): fix emit! macro usage in codespace parser 2026-05-28 07:29:33 -04:00
content_stream.rs fix(pdftract-63ka2): AES-128 test buffer allocation for PKCS#7 padding 2026-05-28 01:30:33 -04:00
detection.rs feat(pdftract-25br8): add JS/XFA/conformance detection tests and diagnostic emission 2026-05-28 06:43:53 -04:00
diagnostics.rs fix(pdftract-4pnmd): build.rs doc comment format string parsing 2026-05-28 14:36:45 -04:00
document.rs fix(pdftract-2uk9z): wrap native module results in typed Python objects 2026-05-28 21:18:38 -04:00
dpi.rs feat(pdftract-3s2i): implement Phase 5.5.2 validation filter 2026-05-24 04:57:17 -04:00
extract.rs feat(profiles): add profile infrastructure and initial fixtures 2026-05-31 15:10:51 -04:00
graphics_state.rs fix(pdftract-2uk9z): wrap native module results in typed Python objects 2026-05-28 21:18:38 -04:00
hybrid.rs feat(pdftract-1t5sj): implement book_chapter profile with fixtures and tests 2026-05-27 22:30:09 -04:00
javascript.rs feat(pdftract-4li3d): implement security constraints for serve mode 2026-05-26 18:47:51 -04:00
lib.rs wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
log_policy.rs fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
markdown.rs chore(pdftract-36glh): remove unused JpxDecoder import and add verification note 2026-05-28 05:23:13 -04:00
ocr.rs feat(pdftract-6dki1): implement histogram stretch contrast normalization 2026-05-24 10:30:20 -04:00
options.rs fix(pyo3): correct extract_text_fn call in extract_markdown stub 2026-05-28 20:28:25 -04:00
page_class.rs fix(pdftract-tuky): fix color clamping test and verify Phase 3.1 coordinator 2026-05-26 16:36:01 -04:00
pages.rs fix(pdftract-63ka2): AES-128 test buffer allocation for PKCS#7 padding 2026-05-28 01:30:33 -04:00
preprocess.rs feat(pdftract-3s2i): implement Phase 5.5.2 validation filter 2026-05-24 04:57:17 -04:00
remote.rs fix(pdftract-4pnmd): build.rs doc comment format string parsing 2026-05-28 14:36:45 -04:00
render.rs feat(pdftract-axcri): record inline images as ImageXObject entries 2026-05-24 07:41:50 -04:00
sdk.rs wip: AcroForm improvements, debug tooling, test corpus, and fixture updates 2026-05-30 09:48:14 -04:00
semaphore.rs feat(pdftract-3s2i): implement Phase 5.5.2 validation filter 2026-05-24 04:57:17 -04:00
span_flags.rs feat(pdftract-cbrbg): implement span flag detector for Phase 4.1 2026-05-24 07:28:25 -04:00
text.rs fix(pdftract-38p8h): add fallback for empty block.spans in invisible text filter 2026-05-28 00:39:37 -04:00
url_validation.rs feat(pdftract-3s2i): implement Phase 5.5.2 validation filter 2026-05-24 04:57:17 -04:00
word_boundary.rs feat(pdftract-h2s0z): implement adaptive word boundary detector 2026-05-24 06:06:56 -04:00