svs 0.3.0

Streams and renders Aperio SVS whole-slide pathology images: pan/zoom, LOD tile streaming, JPEG & JPEG2000, no full-image load.

0.3.0

• SvsAnnotationController, SvsAnnotation: draw and manage point, rectangle, polyline, and polygon annotations over an SvsImageView, anchored in level-0 pixel space so they stay put across pan/zoom. Pass a controller to SvsImageView.annotationController to render its annotations and route pointer gestures to it while drawMode isn't SvsAnnotationDrawMode.none — point mode commits on tap, rectangle mode draws on drag, polyline/polygon mode adds a vertex per tap (call finishPath() to commit). Tapping in view mode (drawMode.none) hit-tests and auto-selects an existing annotation, and fires the new SvsImageView.onAnnotationTap callback. Annotations round-trip to JSON via SvsAnnotationController.toJsonList/loadFromJsonList.
• measureAnnotation: physical length (and, for rectangles/polygons, area) of an SvsAnnotation, computed from the slide's microns-per-pixel. SvsImageView shows this as a live label on line/rectangle/polygon annotations — including the one being drawn, so drawing doubles as a ruler — toggle with the new SvsImageView.showMeasurements.
• DiskTileCache: an opt-in persistent tile cache. Pass one to the new SvsImageView.diskCache and decoded tiles are read from disk first (and written back after a fresh decode), so re-viewing the same region of a slide — even across app restarts — skips the tile fetch and, for JPEG2000 slides, the wavelet decode. Byte-budgeted and LRU-evicted like the existing in-memory TileCache.

0.2.0

• readSvsRegion: crops an arbitrary rectangle of any pyramid level to a single composited image, stitching together only the tiles it overlaps. The rectangle may hang off the level's edges; the out-of-bounds part decodes transparent.
• encodeSvsImage, exportSvsRegion, exportAssociatedImage, exportSvsLevel: encode a decoded image (a crop, an associated image, or a whole pyramid level) to PNG, JPEG, BMP, TIFF, or WebP bytes, via the new image dependency. exportSvsLevel guards against accidentally compositing/encoding a gigapixel level whole. Each has a ...ToFile counterpart (exportSvsRegionToFile, exportAssociatedImageToFile, exportSvsLevelToFile) that writes straight to a path instead of returning bytes.

0.1.0

• Initial release.
• SvsFile: opens Aperio SVS (and generic tiled TIFF) files — resolution pyramid levels, associated images (thumbnail/label/macro), and parsed Aperio metadata (magnification, microns-per-pixel).
• SvsImageView: a pan/zoom widget streaming only the tiles the current viewport needs, at the resolution level matching the current zoom. Includes a minimap, zoom percentage, and a physical (µm/mm) scale bar.
• JPEG (Compression=7) and JPEG2000 (Compression=33005) tile decoding — JPEG2000 via the openjpeg_ffi package.
• Tile fetch and JPEG2000 decode run on background isolates; a memory-budgeted LRU tile cache responds to OS memory-pressure signals and actively cancels in-flight requests for tiles scrolled out of view.