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Optimize grey level approximation.

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gryf
2021-01-18 20:18:38 +01:00
parent 9ccafeec1d
commit e6dd89004f
1 changed files with 29 additions and 36 deletions
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53
colors/wombat256grf.vim
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@@ -1,6 +1,6 @@
" Vim color file " Vim color file
" Maintainer: Roman 'gryf' Dobosz " Maintainer: Roman 'gryf' Dobosz
" Last Change: 2017-05-30 " Last Change: 2021-01-18
" "
" wombat256grf.vim - a modified version of Wombat by Lars Nielsen (at al) that " wombat256grf.vim - a modified version of Wombat by Lars Nielsen (at al) that
" also works on xterms with 88 or 256 colors. Instead of hard coding colors " also works on xterms with 88 or 256 colors. Instead of hard coding colors
@@ -24,34 +24,28 @@ if !has("gui_running") && &t_Co != 88 && &t_Co != 256
endif endif
" functions {{{ " functions {{{
" helper function for numerical sorting.
function s:sort_ints(a, b)
let l:a = str2nr(a:a)
let l:b = str2nr(a:b)
return l:a == l:b ? 0 : l:a > l:b ? 1 : -1
endfunction
" returns an approximate grey index for the given grey level " returns an approximate grey index for the given grey level
fun <SID>grey_number(x) fun s:get_approximate_grey_idx(x)
if &t_Co == 88 if &t_Co == 88
if a:x < 23 let l:grey_map = {23: 0, 69: 1, 103: 2, 127: 3, 150: 4, 173: 5, 196: 6,
return 0 \219: 7, 243: 8}
elseif a:x < 69 for i in sort(keys(l:grey_map), "s:sort_ints")
return 1 if a:x < i
elseif a:x < 103 return l:grey_map[i]
return 2
elseif a:x < 127
return 3
elseif a:x < 150
return 4
elseif a:x < 173
return 5
elseif a:x < 196
return 6
elseif a:x < 219
return 7
elseif a:x < 243
return 8
else
return 9
endif endif
endfor
return 9
else else
if a:x < 14 if a:x < 14
return 0 return 0
else endif
let l:n = (a:x - 8) / 10 let l:n = (a:x - 8) / 10
let l:m = (a:x - 8) % 10 let l:m = (a:x - 8) % 10
if l:m < 5 if l:m < 5
@@ -60,7 +54,6 @@ fun <SID>grey_number(x)
return l:n + 1 return l:n + 1
endif endif
endif endif
endif
endfun endfun
" returns the actual grey level represented by the grey index " returns the actual grey level represented by the grey index
@@ -177,9 +170,9 @@ endfun
" returns the palette index to approximate the given R/G/B color levels " returns the palette index to approximate the given R/G/B color levels
fun <SID>color(r, g, b) fun <SID>color(r, g, b)
" get the closest grey " get the closest grey
let l:gx = <SID>grey_number(a:r) let l:gx = s:get_approximate_grey_idx(a:r)
let l:gy = <SID>grey_number(a:g) let l:gy = s:get_approximate_grey_idx(a:g)
let l:gz = <SID>grey_number(a:b) let l:gz = s:get_approximate_grey_idx(a:b)
" get the closest color " get the closest color
let l:x = <SID>rgb_number(a:r) let l:x = <SID>rgb_number(a:r)
@@ -379,9 +372,9 @@ delf <SID>color
delf <SID>rgb_color delf <SID>rgb_color
delf <SID>rgb_level delf <SID>rgb_level
delf <SID>rgb_number delf <SID>rgb_number
delf <SID>grey_color delf <SID>get_grey_color_idx
delf <SID>grey_level delf <SID>get_grey_level
delf <SID>grey_number delf s:get_approximate_grey_idx
" }}} " }}}
" vim:set ts=4 sw=4 sts=4 fdm=marker: " vim:set ts=4 sw=4 sts=4 fdm=marker: