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simpler SetSat

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This commit is contained in:
Ryan Oldenburg 2020-12-03 20:18:15 -06:00
parent fcf072ff5a
commit 9633f29a6b
1 changed files with 3 additions and 35 deletions
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38
src/pixie/blends.nim
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@ -312,41 +312,9 @@ proc Sat(C: Color): float32 {.inline.} =
max([C.r, C.g, C.b]) - min([C.r, C.g, C.b])
proc SetSat(C: Color, s: float32): Color {.inline.} =
var arr = [(C.r, 0), (C.g, 1), (C.b, 2)]
# TODO: Don't rely on sort.
arr.sort()
var
Cmin = arr[0][0]
Cmid = arr[1][0]
Cmax = arr[2][0]
if Cmax > Cmin:
Cmid = (((Cmid - Cmin) * s) / (Cmax - Cmin))
Cmax = s
else:
Cmid = 0
Cmax = 0
Cmin = 0
if arr[0][1] == 0:
result.r = Cmin
if arr[1][1] == 0:
result.r = Cmid
if arr[2][1] == 0:
result.r = Cmax
if arr[0][1] == 1:
result.g = Cmin
if arr[1][1] == 1:
result.g = Cmid
if arr[2][1] == 1:
result.g = Cmax
if arr[0][1] == 2:
result.b = Cmin
if arr[1][1] == 2:
result.b = Cmid
if arr[2][1] == 2:
result.b = Cmax
let satC = Sat(C)
if satC > 0:
result = (C - min([C.r, C.g, C.b])) * s / satC
proc alphaFix(Cb, Cs, mixed: Color): Color {.inline.} =
let ab = Cb.a