https://github.com/Treeki/libxbr-standalone

Library implementing the xBR pixel art scaling algorithm
https://github.com/Treeki/libxbr-standalone

Last synced: 18 days ago
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Library implementing the xBR pixel art scaling algorithm

• Host: GitHub
• URL: https://github.com/Treeki/libxbr-standalone
• Owner: Treeki
• Created: 2015-03-02T21:34:01.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2015-11-06T00:47:37.000Z (about 9 years ago)
• Last Synced: 2024-07-31T22:56:11.249Z (3 months ago)
• Language: C
• Size: 134 KB
• Stars: 107
• Watchers: 10
• Forks: 21
• Open Issues: 5
• Metadata Files:
  • Readme: README.md

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README

        
Standalone XBR/hqx Library

==========================

This library implements the xBR pixel art scaling filter developed by Hyllian,

and now also the hqx filter developed by Maxim Stepin.

I needed a standalone implementation, but could not find any ready-to-use ones.

I found versions of the algorithm used in various open-source projects and I

eventually settled on a modified version of the one used in FFmpeg's

libavfilter.

I also wanted to use hqx and needed to make some changes to the code, so I

wound up merging this into the same codebase/library. This project is the

result.

Original source for the xBR implementation: http://git.videolan.org/gitweb.cgi/ffmpeg.git/?p=ffmpeg.git;a=blob;f=libavfilter/vf_xbr.c;h=5c14565b3a03f66f1e0296623dc91373aeac1ed0;hb=HEAD

Original source for the hqx implementation: https://code.google.com/p/hqx/

This version is a pure C library that operates on 32-bit ARGB data. It scales

images up to 2x, 3x and 4x sizes, and preserves and interpolates the alpha

channel as necessary.

Project files included to compile as a DLL with Visual Studio 2012. Code

should also compile successfully under GCC on other platforms, and probably

with other Visual Studio versions.

A crude example application is included that uses libpng to apply the

available filters to 32-bit images.

Licensed under the GNU Lesser General Public License, version 2.1. (See the

header in `xbr.h` and `xbr.c`.)