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nrobi144
0a4550af26
Phase 1 part A of desktop image compression. Pure data types — no
external dependencies yet beyond Thumbnailator already on classpath.
- CompressionQuality enum (Low / Medium / Desktop High) with
JPEG quality values tuned for 2026 displays (0.65 / 0.75 / 0.90)
rather than the obsolete 2014-era Android values.
- ImageFormat sealed class covering the 9 formats the orchestrator
must distinguish (JPEG/PNG/BMP/TIFF re-encoded, animated GIF and
animated WebP byte-identical pass-through, SVG pass-through,
AVIF and HEIC refused for lack of a pure-Java decoder).
- ImageFormatSniffer with magic-byte detection + RFC 9649 VP8X
animation-flag check + GIF NETSCAPE2.0 application-extension
scan + ISO BMFF ftyp brand match for AVIF / HEIC variants.
- CompressionException sealed hierarchy (UnsupportedFormat /
InputTooLarge / EncodeFailed) with initCause for chain
preservation through logging.
23 sniffer unit tests cover each format including JPEG-via-file,
empty input, missing file, and both WebP animation paths.