Color spaces (sRGB etc.)

[bvssvni]

This library is intended for 2D textures where choice of color space is implemented by graphics backends. The Format enum describes the memory layout used to create and update textures. Therefore, Format::Rgba8 describes channels and bits, but no color space information.

The most common format used in image editors, cameras etc. is sRGB. Since this is supported by shader pipelines on most modern hardware, it is intended to be the default behavior for Piston 2D graphics backends.

Therefore, unless a backend specifies otherwise, the color space is assumed to be sRGB.

This is based on the following assumptions:

• Most generic code at higher level than shaders do not care about color space
• In many cases the choice of color space depends on how image editors store colors, which is usually sRGB
• sRGB is most common when doing 2D
• Choice of color space is relatively rare, but can be worked around either by writing lower level code or modify a graphics backend

[btbouwens]

I see several example programs where Texture's are used to display images, and the images I'm working with are typically 8 or 16 bit monochrome, so having only Rgba8 as a possible Format feels somewhat restrictive. Being a total Rust noob I probably underestimate the complexity of generalisation to multiple formats.