Procs

proc gaussianKernel(radius: int): seq[uint32] {...}{.raises: [], tags: [].}

Compute lookup table for 1d Gaussian kernel. Values are [0, 255] * 1024.

proc toStraightAlpha(data: var seq[ColorRGBA | ColorRGBX])

Converts an image from premultiplied alpha to straight alpha. This is expensive for large images.

proc toPremultipliedAlpha(data: var seq[ColorRGBA | ColorRGBX])

Converts an image to premultiplied alpha from straight alpha.

proc packAlphaValues(v: M128i): M128i {...}{.inline, raises: [], tags: [].}

Shuffle the alpha values for these 4 colors to the first 4 bytes

proc unpackAlphaValues(v: M128i): M128i {...}{.inline, raises: [], tags: [].}

Unpack the first 32 bits into 4 rgba(0, 0, 0, value)