= Changelog
The file documents the changes to this library over the different versions.
- ChunkyPNG uses semantic versioning. This means that the public API will not change except for major versions.
- Please add an entry to the "Unreleased changes" section in your pull requests, so I can move them into a numbered version section on release.
=== Unreleased changes
- Nothing yet!
=== 1.3.8 - 2016-08-31
- Add support for reading and writing an image's physical dimension (pHYs chunks).
=== 1.3.7 - 2016-08-31
- Performance improvement for Color.euclidean_distance_rgba.
- Bugfix in decoding transparent pixels when decoding multiple images in a row.
=== 1.3.6 - 2016-06-19
- Allow reading images from streams that have trailing data after the IEND chunk.
- Add compatibility for Ruby 2.3's frozen string literals.
- Documentation updates and small cleanups.
=== 1.3.5 - 2015-10-28
- Performance improvements for Canvas#crop! and ImageData.combine_chunks
- Update chunky_png/rmagick to work with the latest versions of RMagick.
- Bugfix in Color#from_hsl and Color#from_hsv when hue value is 360.
- Fix encoding issue in Datastream#to_blob
=== 1.3.4 - 2015-02-16
- Assert compatibility with Ruby 2.2
- Improved documentation using RDoc, so it is included on http://www.rubydoc.info/gems/chunky_png
- Update chunkypng.com website; migrate some stuff from the wiki.
=== 1.3.3 - 2014-10-24
- Improve performance of Canvas#crop and Canvas#crop! by doing less memory allocations.
- Update to RSPEC 3
- Add CONTRIBUTING.rdoc file.
=== 1.3.2 - 2014-10-18
- Add HSV/HSL color conversions: Color.from_hsl, Color.to_hsl
- Allow empty IDAT chunks to better conform to the PNG standard.
- Small bugfix in image resampling.
- Documentation and code readability improvements.
=== 1.3.1 - 2014-04-28
- Improve performance of Palette.from_canvas.
- Add Color.euclidean_distance_rgba to compare colors.
- Bugix in Canvas.from_bgr_stream.
- Documentation and code readibility improvements.
- README updates, include mention of screencast.
=== 1.3.0 - 2014-02-10
- Add support for parsing color that use three-hex notation. (e.g. #aaa instead of #aaaaaa)
- Add Canvas#border! and Canvas#border to draw a border around a canvas.
- Add Canvas#trim! and Canvas#trim to trim a border from a canvas.
=== 1.2.9 - 2013-10-17
- Set license in chunky_png.gemspec for better discoverability.
- Improve error messages for Canvas#crop.
- Use better gem release management tasks from bundler.
=== 1.2.8 - 2013-03-30
- Ruby 2.0 compatibility.
- Fixed some encoding issues on JRuby.
- Update Travis CI configuration to test on more Ruby versions.
=== 1.2.7 - 2013-01-07
- Small PNG decoding performnace improvements by using bitwise math.
=== 1.2.6 - 2012-08-07
- Add decompression bomb security warning to README.
- Fix RMagick loading issue on case sensitive filesystems.
- Some compatibility fixes for the upcoming Ruby 2.0.
- Allow more data-url notations for ChunkyPNG::Canvas.from_data_url.
=== 1.2.5 - 2011-09-23
- Edge case bugfix in Color.decompose_alpha_component that could get triggered in the change_theme_color! method.
=== 1.2.4 - 2011-09-14
- Added data URL importing Canvas.from_data_url.
=== 1.2.3 - 2011-09-14
- Added data URL exporting Canvas#to_data_url to easily use PNGs inline in CSS or HTML.
=== 1.2.2 - 2011-09-14
- Workaround for performance bug in REE.
=== 1.2.1 - 2011-08-10
- Added bicubic resampling of images.
- Update resampling code to use integer math instead of floating points.
=== 1.2.0 - 2011-05-08
- Properly read PNG files with a tRNS chunk in color mode 0 (grayscale) or 2 (true color).
=== 1.1.2 - 2011-05-06
- Added Color.to_grayscale and Canvas#grayscale! to convert colors and canvases to grayscale.
- Memory footprint improvement of Canvas#resample!
=== 1.1.1 - 2011-04-22
- Added Canvas#to_alpha_channel_bytes and Canvas#to_grayscale_stream to export raw pixel data.
- Spec suite cleanup
=== 1.1.0 - 2011-03-19
- Add bezier curve drawing: Canvas#bezier_curve.
- RDoc fixes & improvements.
=== 1.0.1 - 2011-03-08
- Performance improvements.
=== 1.0.0 - 2011-03-06
There are some API changes for this release. If you are using Canvas#compose or Canvas#replace, these methods will no longer operate in place, but will return a new canvas instance instead. The in place versions have been renamed to compose! and replace! to be more consistent with the rest of the API.
- Added image resampling using the nearest neighbor algorithm: Canvas#resample.
- Added circle and polygon drawing methods: Canvas#circle and Canvas#polygon.
- Added in place version of Canvas#crop, Canvas#rotate_180, Canvas#flip_horizontally and Canvas#flip_vertically. Just add a bang to the method name (e.g. Canvas#crop!) and it will change the current canvas instead of returning a new one. These implementations are also more memory and CPU efficient.
- Added geometry helper classes: ChunkyPNG::Point, ChunkyPNG::Dimension and ChunkyPNG::Vector.
- Added a list of HTML named colors. Get them by calling ChunkyPNG::Color(:teal) or ChunkyPNG::Color('red @ 0.8')
- Added encoding support for 1-, 2-, and 4-bit grayscale images.
- Cleaned up auto-detection of color mode settings. It will now choose 1 bit grayscale mode if an image only contains black and white. (The other low bitrate grayscale modes are never chosen automatically.)
- RDoc improvements. See http://rdoc.info/gems/chunky_png/frames.
- ChunkyPNG is now also tested on Ruby 1.8.6.
=== 0.12.0 - 2010-12-12
- Added support for encoding indexed images with a low bitrate. It will automatically use less bits per pixel if possible.
- Improved testing setup. ChunkyPNG is now tested on Ruby 1.8.7, 1.9.2, JRuby and Rubinius.
=== 0.11.0 - 2010-11-16
- Decoding of 1, 2 and 4 bit indexed color images.
- Decoding of 1, 2 and 4 bit grayscale images.
- Decoding 16 bit images. The extra bits will be discarded, so the image will be loaded as 8 bit.
- Used the official PNG suite to build a more complete test suite.
=== 0.10.5 - 2010-10-21
- Bugfix: allow 256 instead of 255 colors for indexed images.
=== 0.10.4 - 2010-10-17
- Improved handling of binary encoding for strings in Ruby 1.9.
=== 0.10.3 - 2010-10-07
- Small fix to make grayscale use the B byte consistently.
=== 0.10.2 - 2010-10-04
- Another small fix for OilyPNG compatibility
=== 0.10.1 - 2010-10-03
- Small fix for OilyPNG compatibility
=== 0.10.0 - 2010-10-03
- Refactored decoding and encoding to work on binary strings instead of arrays of integers. This gives a nice speedup and uses less memory. Thanks to Yehuda Katz for the idea.
=== 0.9.2 - 2010-09-16
- Fixed an issue with interlaced images.
=== 0.9.1 - 2010-09-15
- Fixed image metadata issue when duplicating images.
=== 0.9.0 - 2010-08-18
- Added flip_horizontally, flip_vertically, rotate_left, rotate_right and rotate_180 to ChunkyPNG::Canvas.
- Now raises ChunkyPNG::OutOfBounds exceptions when referencing coordinates outside the image bounds.
- Added Gemfile for development dependency management.
=== 0.8.0 - 2010-06-30
- Added ChunkyPNG::Image#rect to draw simple rectangles.
- Fixed composing a transparent color on a fully transparent background.
=== 0.7.3 - 2010-04-28
- Based on the suggestion of [Dirkjan Bussink](http://github.com/dbussink), introduced custom exception classes:
- ChunkyPNG::SignatureMismatch is raised when the PNG signature could not be found. Usually this means the the file is not a PNG image.
- ChunkyPNG::CRCMismatch is raised when the a CRC check for a chunk in the PNG file fails.
- ChunkyPNG::NotSupported is raised when the PNG image uses a feature that ChunkyPNG does not support.
- ChunkyPNG::ExpectationFailed is raised when a required expectation failed.
=== 0.7.2 - 2010-04-28 [YANKED]
=== 0.7.1 - 2010-03-23
- Some fixes for 32-bit systems.
=== 0.7.0 - 2010-03-15
- Added :best_compression saving routine to allow creating the smallest images possible.
- Added option to control Zlib compression level while saving.
=== 0.6.0 - 2010-02-25
- Added methods to easily create different color variants of an image with a color theme. See [[Images with a color theme]] for more information.
=== 0.5.8 - 2010-02-24
- Ruby 1.8.6 compatibility fixes
- Improved API documentation.
=== 0.5.5 - 2010-02-15
- Added alpha decomposition to extract a color mask from a themed image.
- Improved API documentation.
=== 0.5.4 - 2010-01-17
- Added point and line anti-aliased drawing functions.
=== 0.5.3 - 2010-01-16
- Removed last occurrences of floating math to speed up the library.
- Added importing of ABGR and BGR streams.
- Added exporting an image as ABGR stream.
=== 0.5.2 - 2010-01-15
- Ruby 1.9 compatibility fixes.
- Improved speed of PNG decoding.
- Bugfix in *average* scanline decoding filter.
=== 0.5.1 - 2010-01-15
- Added :fast_rgba and :fast_rgb saving routines, which yield a 1500% speedup when saving an image.
=== 0.5.0 - 2010-01-15
- Complete rewrite of the earlier versions, now including awesomeness and unicorns.