Crate otf_pixels_codec_tiff 

TIFF codec for otf-pixels, implemented from scratch.

Baseline TIFF 6.0: both byte orders, strip and tile layouts, none/LZW/ Deflate/PackBits compression, greyscale/RGB/palette photometrics at 1, 8 and 16 bits. Exotic tags are skipped rather than treated as errors, which SPEC §Formats requires and TIFF’s extensibility makes essential.

Why TIFF is the streaming showcase

A tiled TIFF stores its pixels as an array of independently compressed rectangles, each with its own offset. That makes it the one v1 format capable of genuine random access: producing an arbitrary region means decompressing the tiles it touches and nothing else.

So TiffDecoder reports DecodeCapability::Regions for a tiled file, and the scheduler pulls regions rather than rows. Turning a 2 GB tiled scan into a thumbnail then costs the tiles the thumbnail actually needs — which is what ADR-0001’s demand-driven design was for, and what the rest of v1 has been building toward.

Modules

tag

The baseline tags this codec understands (TIFF 6.0 §Section 8).

Structs

Directory

A parsed image file directory.

TiffCodec

The TIFF entry in a sniffing registry.

TiffDecoder

Decodes a TIFF stream.

TiffEncoder

Encodes a baseline TIFF.

TiffImage

Everything about a TIFF image that decoding needs.

Enums

ByteOrder

Byte order, from the two-character header.

Compression

How pixel data is compressed (TIFF 6.0 §Section 8, plus §Deflate).

Layout

Whether the pixels are stored in strips or tiles.

Photometric

How samples are interpreted.

TiffLayout

How an encoder arranges pixels in the file.

Functions

probe

Whether prefix starts with a TIFF header.