Accept different sampling filters on resize

[foresterre]

• Currently on a resize, the Gaussian sampling filter is always used;

• the image crate offers various other sampling filters: https://docs.rs/image/0.19.0/image/enum.FilterType.html

• Nearest

• Triangle

• CatmullRom

• Lanczos3

• Gaussian (also the default)

syntax:

• Must have a syntax limited to tokens available in the ASCII set
• Must support letters, numbers and some type of word separator
• Must be unordered
• Must support both Key Value and Flag
• Must be reusable as syntax (i.e. like a general "data structure") with sic script v1
• Should be accessible to type from the command line
• Should be accessible to type within a file
• Should be easy to read

Ideas for syntax:

• resize x y <optional format>

• resize 4 5 == resize 4 5 :sampling_filter gaussian

• resize 4 5 :sampling_filter lanczos3

• resize 4 5 -sampling-filter lanczos3

• resize 4 5 +sampling-filter lanczos3

• resize 4 5 #sampling-filter lanczos3

• resize 4 5 (sampling-filter: lanczos3)

• resize 4 5 {sampling-filter: lanczos3}

selected choice:

• setopt resize <option> <option value>
  • setflag resize <flag>
• resize <x> <y>

examples:
cargo run -- --apply-operations "setopt resize sampling_filter triangle;resize 50 50" ./resources/bwlines.png ./target/o.png

--

PR: #102
Related:

• Add keep-aspect-ratio option to resize (image operation) #45 (Add keep-aspect-ratio flag or option to resize)

[foresterre]

implemented in #102