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Lilith River 3d3c16e26f feat: support packed extended bit depths (9-15, 17-31 bits per sample) 
TIFF files can store samples at non-standard bit depths (e.g. 10, 12,
14, 24 bits) packed tightly in a continuous bit stream. Previously
these were rejected as unsupported color types.

This adds:
- MSB-first bit extraction from packed byte streams (unpack_bits,
  extract_bits_msb) to expand N-bit samples to standard-width output
  (9-16 bit → u16, 17-32 bit → u32)
- Output buffer sizing using the promoted sample width instead of the
  packed bit depth (output_bits_per_sample field in ReadoutLayout)
- A new code path in expand_chunk that reads packed rows, unpacks to
  standard-width samples, then applies predictor and color inversion
- Horizontal predictor support for extended depths

Tested with 12-bit grayscale and RGB images (existing test suite),
plus all libtiffpic depth test images (10/12/14/24-bit in gray, RGB
contig, and RGB planar configurations).
 2026-03-10 06:01:48 -06:00
Aurelia Molzer 8a5c2da511 Merge pull request #361 from lilith/feat/palette-support 
Support palette (ColorMap) image decoding
 2026-03-10 04:15:52 +00:00
Lilith River 3b11e2f577 feat: support palette (ColorMap) image decoding 
Read the ColorMap tag (320) for RGBPalette images and return raw
palette indices as the decoded data with ColorType::Palette(n).

Changes:
- Read and validate ColorMap tag during IFD parsing (3 * 2^bps entries)
- Return ColorType::Palette from colortype() for RGBPalette images
- Accept Palette in expand_chunk validation (standard + sub-byte depths)
- Expose color_map() method on Decoder for palette lookup
- Add tests for 1-bit, 4-bit, 8-bit palette images with checksums
- Add test verifying ColorMap accessibility and structure

The decoder returns raw palette indices; consumers apply the lookup
using the color map returned by Decoder::color_map().
 2026-03-09 21:03:30 -06:00
Aurelia Molzer c6f6ff4c95 Merge pull request #359 from image-rs/tile-offset-compatibility 
Tile offset compatibility
 2026-03-08 02:29:15 +00:00
A. Molzer d7d24d0f7c Changelog entry for tile treatment 2026-03-08 03:00:15 +01:00
A. Molzer 58e93fb8a3 Align tile detection to libtiff 2026-03-08 03:00:15 +01:00
Aurelia Molzer 595e67e5fb Merge pull request #358 from image-rs/open-behavior-documentation 
Document `Decoder::open` behavior
 2026-03-06 20:15:29 +00:00
A. Molzer 812bc970ba Document Decoder::open behavior 2026-03-06 21:09:32 +01:00
Aurelia Molzer 82b646298d Merge pull request #356 from Shnatsel/better-docs 
Improve documentation on compression and predictor
 2026-03-06 19:12:56 +00:00
Sergey "Shnatsel" Davidoff 22ff2b5c50 Merge pull request #355 from Shnatsel/drop-exact-level 
Drop obsolete Deflate::exact_level()
 2026-03-06 18:49:06 +00:00
Sergey "Shnatsel" Davidoff 3a6492f251 More docs on the predictor 2026-03-06 15:46:37 +00:00
Sergey "Shnatsel" Davidoff a03eeccfe5 Document Compression enum variants 2026-03-06 14:47:44 +00:00
Sergey "Shnatsel" Davidoff 287fcb9309 Drop obsolete Deflate::exact_level() 2026-03-06 14:40:37 +00:00
Sergey "Shnatsel" Davidoff ba97bad411 Merge branch 'main' into better-docs 2026-03-06 14:39:37 +00:00
Aurelia Molzer c4ab46ad2c Merge pull request #354 from Shnatsel/derive-debug 
Derive useful traits on public types
 2026-03-06 11:45:45 +00:00
Sergey "Shnatsel" Davidoff eaf9cc1d6c Merge branch 'main' into better-docs 2026-03-06 11:02:09 +00:00
Sergey "Shnatsel" Davidoff 34191fa9ca Merge branch 'main' into derive-debug 2026-03-06 10:55:44 +00:00
Sergey "Shnatsel" Davidoff b0bd33dbe4 Remove equality from rational types; can be implemented later via cross-multiplication 2026-03-06 10:54:37 +00:00
Sergey "Shnatsel" Davidoff 2ca2427c75 cargo fmt 2026-03-06 10:51:23 +00:00
Aurelia Molzer e8be8656f2 Merge pull request #353 from Shnatsel/non-exhaustive-compression 
Make Compression enum non-exhaustive
 2026-03-06 10:45:28 +00:00
Sergey "Shnatsel" Davidoff ea949032a2 cargo clippy --fix 2026-03-06 10:43:54 +00:00
Sergey "Shnatsel" Davidoff 87007d85a0 Derive Debug on Compression enum 2026-03-06 10:41:20 +00:00
Sergey "Shnatsel" Davidoff 2119bff354 More derives on TIFF value structs 2026-03-06 10:36:12 +00:00
Sergey "Shnatsel" Davidoff c62a69ec9d Expand predictor docs 2026-03-06 10:07:06 +00:00
Sergey "Shnatsel" Davidoff 79a791b49a Clarify predictor docs 2026-03-06 10:02:24 +00:00
Sergey "Shnatsel" Davidoff e1e9f36c5a Make Compression enum non-exhaustive 2026-03-06 09:49:10 +00:00
Sergey "Shnatsel" Davidoff 19caae4f53 Rename safe-rust-zstd to zstd-safe-rust 2026-03-06 09:36:09 +00:00
Aurelia Molzer 0ad653433a Merge pull request #352 from image-rs/iterate-over-raw-tiff-or-exif 
Open a Tiff without interpreting the first directory
 2026-03-06 08:34:19 +00:00
A. Molzer bf79af8de4 Add Decoder::open, deprecate new 2026-03-06 09:31:23 +01:00
Aurelia Molzer 54dddc4943 Merge pull request #347 from image-rs/iterate-over-raw-tiff-or-exif 
Enable iteration over raw, malformed tiff or exif
 2026-03-06 07:31:13 +00:00
A. Molzer be9b3a04b9 Expand documentation with TiffHeader 2026-03-06 06:05:32 +01:00
A. Molzer 08f1b25fac Drafting release notes 2026-03-06 05:35:45 +01:00
A. Molzer c7b97519a0 Error guarantee on decoder IFD iteration 2026-03-06 04:42:02 +01:00
A. Molzer e093e15bbe Remove redundant next_ifd attribute 2026-03-06 03:44:08 +01:00
A. Molzer 647e9b4a81 Add TiffHeader to open a file without seeking 2026-03-06 02:59:45 +01:00
Aurelia Molzer 31c49ea6ef Merge pull request #351 from Shnatsel/semver-breaking-deflate-level 
Implement DEFLATE compression level control properly, with a semver break
 2026-03-05 20:12:27 +00:00
Sergey "Shnatsel" Davidoff 0362e6e31d Implement DEFLATE compression level control properly, with a semver break 2026-03-05 17:59:18 +00:00
Sergey "Shnatsel" Davidoff 0fe5b2804e Merge pull request #348 from Shnatsel/deflate-level 
Expose precise DEFLATE level controls
 2026-03-05 17:23:59 +00:00
Sergey "Shnatsel" Davidoff 61dbcc1392 Add error handling 2026-03-05 13:15:33 +00:00
Sergey "Shnatsel" Davidoff d9d4f0a905 Add safe Rust Zstd decoding option 2026-03-05 13:10:07 +00:00
Sergey "Shnatsel" Davidoff a589010099 Fix typo 2026-03-05 12:22:37 +00:00
Sergey "Shnatsel" Davidoff 53498074a4 Merge impl blocks 2026-03-05 12:22:25 +00:00
Sergey "Shnatsel" Davidoff cb543cded7 Expose precise DEFLATE level controls 2026-03-05 11:58:18 +00:00
A. Molzer cf8f96568e Expose Decoder::seek_to_directory 2026-03-04 08:59:41 +01:00
A. Molzer 4ff88e658d Rewrite Decoder::seek_to_image 2026-03-04 05:12:31 +01:00
A. Molzer 14ebf376f3 Move Directory from image into decoder proper 
This prepares allowing to iterate over a TIFF file with invalid images
while `Image` maintains invariants. For instance we precalculate the
amount of buffer space and verify that the count of strips makes sense
in the constructor—so we do not have to redo that for every other entry
point.
 2026-03-04 03:37:42 +01:00
Aurelia Molzer 37578add53 Merge pull request #344 from RunDevelopment/fix-libtiffpic-test-for-windows 
Fix libtiffpic test for Windows
 2026-03-03 20:42:20 +00:00
Aurelia Molzer 2b9476566b Merge pull request #346 from RunDevelopment/invert-color-as-chunks 
More optimal code gen for `invert_colors`
 2026-03-03 20:30:20 +00:00
Aurelia Molzer 448a0e61d1 Merge pull request #345 from mpospelova/increase-group4reader-height-size 
Change Group4Reader height dimension from u16 to u32
 2026-03-03 20:23:52 +00:00
RunDevelopment d872ff8751 Unify grayscale integer code paths 2026-03-03 14:54:32 +01:00