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feat: Improve CMap handling with binary CMap support, inline ToUnicode, and fallback decoding

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- Add pdf.js binary CMap (bcmap) parser for Japan1/GB1/CNS1 CID fonts
- Support inline ToUnicode streams (not just object references)
- Add CMapDecisionCache for heuristic primary vs remapped CMap selection
- Build fallback CMaps from embedded font data and CIDSystemInfo
- Handle simple fonts without ToUnicode via embedded font cmap
- Add Symbol/Wingdings/ZapfDingbats font decoding fallback
- Support usecmap chaining in both text and binary CMap formats
- Scan XObject Forms for text operators in detector
- Change default detection strategy from EarlyExit to Sample(8)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Abimael Martell
2026-02-20 18:47:10 -08:00
co-authored by Claude Opus 4.6
parent 66c88a4fc9
commit 65e305d544
175 changed files with 1669 additions and 138 deletions
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tests/integration_tests.rs
+1 -1
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@@ -57,7 +57,7 @@ fn make_text_item_with_font(
#[test]
fn test_detection_config_default() {
let config = DetectionConfig::default();
assert!(matches!(config.strategy, ScanStrategy::EarlyExit));
assert!(matches!(config.strategy, ScanStrategy::Sample(8)));
assert_eq!(config.min_text_ops_per_page, 3);
assert!((config.text_page_ratio_threshold - 0.6).abs() < 0.001);
}