zune_jpeg

Module color_convert

Source
Expand description

Color space conversion routines

This files exposes functions to convert one colorspace to another in a jpeg image

Currently supported conversions are

  • YCbCr to RGB,RGBA,GRAYSCALE,RGBX.

Hey there, if your reading this it means you probably need something, so let me help you.

There are 3 supported cpu extensions here.

  1. Scalar
  2. SSE
  3. AVX

There are two types of the color convert functions

  1. Acts on 16 pixels.
  2. Acts on 8 pixels.

The reason for this is because when implementing the AVX part it occurred to me that we can actually do better and process 2 MCU’s if we change IDCT return type to be i16's, since a lot of CPU’s these days support AVX extensions, it becomes nice if we optimize for that path , therefore AVX routines can process 16 pixels directly and SSE and Scalar just compensate.

By compensating, I mean I wrote the 16 pixels version operating on the 8 pixel version twice.

Therefore if your looking to optimize some routines, probably start there.

Re-exports§

pub use scalar::ycbcr_to_grayscale;
pub use crate::color_convert::avx::ycbcr_to_rgb_avx2;
pub use crate::color_convert::avx::ycbcr_to_rgba_avx2;

Modules§

avx 🔒
AVX color conversion routines
scalar 🔒

Functions§

choose_ycbcr_to_rgb_convert_func