"macro language" for image processing operations

[foresterre]

• Add 'macro language' for image processing functions support

• Command line syntax? ideas:

  • sic in out.ext --script "invert; rotate180; flip_vertical"
  • sic in out.ext --script-from-file example.sic
  • sic in out -f PNG --map "invert; rotate180"

See #8 (provides base layer for the image script, plus the first 4 operations).

Current grammar: https://github.com/foresterre/sic/blob/master/src/operations/grammar.pest
Useful grammar editor: https://pest-parser.github.io/#editor
Grammar syntax: https://pest-parser.github.io/book/grammars/syntax.html

Operations implemented:

• blur preliminary PR for image operation script  #8
• brighten Add support for brighten operation. #20
• huerotate Huerotate #21
• contrast Contrast operation #25
• crop use resize
• filter3x3 image operation: filter3x3 #40
• flip_horizontal fliph preliminary PR for image operation script  #8 Rename the flip_vertical/flip_horizontal operations. #30
• flip_vertical flipv preliminary PR for image operation script  #8 Rename the flip_vertical/flip_horizontal operations. #30
• grayscale Add grayscale operation. #28
• invert Add invert operation. #31
• resize preliminary PR for image operation script  #8
• rotate180 Rotate #18
• rotate270 Rotate #18
• rotate90 Rotate #18
• unsharpen Add unsharpen operation. #38

[foresterre]

rotate90, rotate180, rotate270 implemented, see by #18

[foresterre]

brighten, see #20