Filtress

Inspired by interval.rs (generates audio via a simple command language), but filtering or otherwise drawing on images.
Things have shifted to maybe doing image mangling based on input file. To do so I could just use the standard go image library to deal with the images.

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Meta-langauge:
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Comments:

# This is a comment. It begins with a pound sign
# Multiline comments use multiple lines all starting with a pound sign

. . .

Operators:
# Operators get applied to numerical values and always lead the number
# = is implicit when writing just an int, but can be optionally included for clarity

+, -, / (floors on decimal), *, %, =

. . .

Variables:
# The following global variables are available

WID # The image width
HIG # The image height
REG # A register for saving numbers?

. . .

Setting the current pixel:
# Valuesthat over or underflow the image dimensions will be looped to aceptable locations

LOC int:int
LOC [op]int:int
LOC int:[op]int
LOC [op]int:[op]int

. . .

Applying changes:
# Just calling APY alone applies the filter to the current selected pixel
# Calling with a ratio sets the width and height of a square in which to apply the filter

APY 
APY [op]int:[op]int

. . .

Colors get set either individually or as a group:
# Using COL as opposed to the individuals requires that all four values are set
# Passing an int with no op sets to that value
# Values udner or overflowing will loop to acceptable values

RED [op]int
GRN [op]int
BLU [op]int
APH [op]int
COL [op]int:[op]int:[op]int:[op]int

. . .

Set the apply mode:
# Using an op with MOD will always loop through the modes as needed based on the operator
#
# Values:
#  0 - Hard mode, replaces pixel contents with the color settings on apply
#  1 - Average mode, averages the incoming channel with the existing channel
#  2 - Loop mode, adds the values of the existing and incoming channels and loops around on overflow
#  3 - Fade mode, works as average mode, but uses the fade timer to fade over the course of a number of pixel adjustments

MOD [op]int

. . .

Set fade time:
# If set below zero, becomes zero

FAD [op]int

. . . 

Doing loops:
# The int after BEG represents the number of times to loop
# At present, loops may not be nested

BEG int 
  [loop contents]
END

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