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Published 23 days ago • verified publisherdeveloperyusuf.com• Latest: 1.2.3
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Fast native image resize, thumbnail and JPEG/PNG encode for Dart over FFI. Several times quicker than the pure-Dart image package; stb-backed, no prebuilt binary.

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0.4.2 #

  • example/no_jank.dart measures what the async variants are for. It builds a 4000x3000 JPEG so no file is needed, makes eight thumbnails on the main isolate and eight with thumbnailJpegAsync, and runs a 16 ms timer alongside to report the longest gap between two ticks. On this machine: 413 ms of silence, about 25 frames, against 18 ms and one. The work takes the same time either way, which is the point; what moves is where it happens.
  • example/README.md says which call to reach for and why the thumbnail functions exist at all, given the three-step version crosses the FFI boundary three times and holds the full-size pixel buffer in Dart in between.

0.4.1 #

  • Declare the benchmark chart in pubspec.yaml so pub.dev renders it on the package page. The chart was already in the repository and the README, but pub.dev shows only what the screenshots: field points at, so the page a reader lands on from search opened with text where the measurement should have been.

0.4.0 #

  • Add thumbnailJpegAsync and thumbnailPngAsync. They take the same arguments as the synchronous versions and return a Future, running the whole decode, resize and encode on a background isolate with Isolate.run so a large image doesn't block the calling isolate. In a Flutter app this keeps the UI responsive while a picked photo is turned into a thumbnail, which neither the pure-Dart image package nor a synchronous FFI call can do on the main isolate. An ImageFfiException raised in the worker surfaces from the future.

0.3.0 #

  • Add thumbnailPng, a one-call decode, resize, and PNG encode that keeps the alpha channel. Reach for it on logos, icons, screenshots, and anything with transparency, where thumbnailJpeg would flatten the transparent areas onto a background.

0.2.1 #

  • Docs: sharpen the pub.dev description to lead with the value and the terms people search.

0.2.0 #

  • resizePixels now takes a colorSpace (ResizeColorSpace.srgb by default, or .linear). sRGB is right for photographic and UI images; linear is for masks and data pixels where an sRGB curve would distort the values.
  • Fix: 2-channel input is now resampled as grayscale + alpha (STBIR_RA) instead of two colour channels, so edges against transparency stay clean for gray+alpha images. Previously a 2-channel resize let transparent pixels bleed into the colour.

0.1.0 #

  • Initial release.
  • Decode PNG, JPEG, BMP, GIF, PSD, TGA, HDR and PIC from memory (decodeImage), with an optional forced channel count.
  • Read dimensions and channel count without decoding pixels (imageInfo).
  • High-quality, sRGB-correct resize (resizePixels).
  • JPEG and PNG encoding to memory (encodeJpeg, encodePng).
  • One-call thumbnail generation (thumbnailJpeg): decode, aspect-preserving downscale and JPEG encode.
  • Native stb sources compiled from source by a Dart build hook; no prebuilt binaries.

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Fast native image resize, thumbnail and JPEG/PNG encode for Dart over FFI. Several times quicker than the pure-Dart image package; stb-backed, no prebuilt binary.

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Topics

#image #resize #jpeg #thumbnail #ffi

License

unknown (license)

Dependencies

code_assets, ffi, hooks, native_toolchain_c

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