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Changelog

All notable changes to this project will be documented in this file.

[0.4.1] - 2025-12-28

Changed

  • PNG compression ~55% faster — New Bigrams filter strategy for FilterStrategy::All significantly improves Max preset performance
  • Improved LZ77 compression — Enhanced match selection logic for better compression ratios
  • Test coverage increased to 86% — Expanded test suite for better reliability

[0.4.0] - 2025-12-27

Changed

  • BREAKING: PNG/JPEG/Resize APIs now use builder pattern — Unified, cleaner, more extensible API
    • All encode functions now take (data, &options) instead of positional arguments
    • Width, height, and color type are now part of the options struct
    • Use PngOptions::builder(w, h).color_type(...).build() to configure PNG
    • Use JpegOptions::builder(w, h).color_type(...).quality(85).build() to configure JPEG
    • Use ResizeOptions::builder(src_w, src_h).dst(dst_w, dst_h).build() to configure resize

Migration Guide

Before (0.3.x):

// PNG
png::encode(&pixels, width, height, ColorType::Rgba)?;
png::encode_with_options(&pixels, width, height, ColorType::Rgba, &options)?;

// JPEG
jpeg::encode(&pixels, width, height, quality)?;
jpeg::encode_with_options(&pixels, width, height, ColorType::Rgb, &options)?;

After (0.4.0):

// PNG
let opts = PngOptions::builder(width, height).color_type(ColorType::Rgba).build();
png::encode(&pixels, &opts)?;

// JPEG
let opts = JpegOptions::builder(width, height)
    .color_type(ColorType::Rgb)
    .quality(85)
    .build();
jpeg::encode(&pixels, &opts)?;

Removed

  • png::encode_with_options() — use png::encode() with builder options
  • jpeg::encode_with_options() — use jpeg::encode() with builder options
  • jpeg::encode_with_color() — use builder .color_type() method
  • jpeg::encode_with_options_into() — use jpeg::encode_into()
  • timing feature flag — unused profiling feature removed to reduce maintenance burden

Added

  • PngOptions::builder(width, height) — builder pattern for PNG options
  • JpegOptions::builder(width, height) — builder pattern for JPEG options
  • PngOptionsBuilder::color_type() — set color type in builder
  • JpegOptionsBuilder::color_type() — set color type in builder
  • Preset helpers now require dimensions: PngOptions::fast(w, h), JpegOptions::fast(w, h, quality)

[0.3.0] - 2025-12-27

Added

  • Image Resizing API — New resize module for high-quality image resizing
    • Three algorithms: Nearest (fastest), Bilinear (balanced), Lanczos3 (highest quality, default)
    • Support for all color types: Gray, GrayAlpha, RGB, RGBA
    • resize() for simple usage, resize_into() for buffer reuse
    • Separable filtering with precomputed contributions for O(2n) per-pixel performance
    • Parallel processing support via the parallel feature flag

Example

use pixo::{resize, ColorType, ResizeAlgorithm};

// Resize a 100x100 RGBA image to 50x50 using Lanczos3
let pixels = vec![128u8; 100 * 100 * 4];
let resized = resize::resize(
    &pixels, 100, 100, 50, 50,
    ColorType::Rgba,
    ResizeAlgorithm::Lanczos3,
)?;
  • WASM Resize Support — resizeImage() function in WASM bindings
    • Aspect ratio preservation option
    • Algorithm selection (nearest, bilinear, lanczos3)

[0.2.1] - 2025-12-27

Changed

  • Documentation link fixes for GitHub and docs.rs compatibility

[0.2.0] - 2025-12-26

Added

  • PNG encoder with all filter types and DEFLATE compression
  • JPEG encoder with baseline and progressive modes
  • Lossy PNG via palette quantization
  • Trellis quantization for JPEG
  • SIMD acceleration (x86_64 AVX2/SSE, aarch64 NEON)
  • WASM bindings with 149 KB binary size
  • CLI tool for command-line compression
  • PNG/JPEG decoding support
  • Comprehensive documentation and guides

[0.1.0] - 2025-12-21

Added

  • Initial release
  • Core compression algorithms (Huffman, LZ77, DEFLATE)
  • Basic PNG and JPEG encoding
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