gamut 0.0.7

gamut

gamut is an image decoding/encoding library for D.

It's design is inspired by the FreeImage design, where the Image concept is monomorphic and can do it all.

gamut tries to have the fastest and most memory-conscious image decoders available in pure D code. It is nothrow @nogc @safe for usage in -betterC and in disabled-runtime D.

Decoding

• PNG: 8-bit and 16-bit, L/LA/RGB/RGBA
• JPEG: 8-bit, L/RGB/RGBA, baseline and progressive
• QOI: 8-bit, RGB/RGBA
• QOIX: 8-bit, L/LA/RGB/RGBA. This is an evolving format, specific to Gamut, that embeds some developments in the QOI family of formats.

Encoding

• PNG. 8-bit, RGB/RGBA
• JPEG: 8-bit, greyscale/RGB, baseline
• QOI: 8-bit, RGB/RGBA
• QOIX: 8-bit, L/LA/RGB/RGBA
• DDS: BC7 encoded, 8-bit, RGB/RGBA

Why QOIX?

Our benchmark results:

Codec	decode mpps	encode mpps	bit-per-pixel
PNG (stb)	89.73	14.34	10.29693
QOI	204.70	150.42	10.35162
QOIX	177.5	103.35	8.30963

• QOIX and QOI generally outperforms PNG in decoding speed and encoding speed.
• QOIX outperforms QOI in compression efficiency at the cost of speed:
• because it's based upon qoi2avg, a better QOI variant for RGB and RGBA images
• because it is followed by LZ4, which removes some of the QOI worst cases.
• Unlike QOI, QOIX adds support for 8-bit greyscale and greyscale + alpha images, with a "QOI-plane" custom codec.