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Update color index func for ascii stream

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This commit is contained in:
Alex X
2024-05-25 13:52:55 +03:00
parent 6f34cf0c95
commit 0bd2fcde54
1 changed files with 8 additions and 1 deletions
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pkg/ascii/ascii.go
+8 -1
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@@ -156,7 +156,7 @@ const x256b = "\x00\x00\x00\x00\x80\x80\x80\xc0\x80\x00\x00\x00\xff\xff\xff\xff\
func xterm256color(r, g, b uint8, n int) (index uint8) { func xterm256color(r, g, b uint8, n int) (index uint8) {
best := uint16(0xFFFF) best := uint16(0xFFFF)
for i := 0; i < n; i++ { for i := 0; i < n; i++ {
diff := uint16(r-x256r[i]) + uint16(g-x256g[i]) + uint16(b-x256b[i]) diff := sqDiff(r, x256r[i]) + sqDiff(g, x256g[i]) + sqDiff(b, x256b[i])
if diff < best { if diff < best {
best = diff best = diff
index = uint8(i) index = uint8(i)
@@ -164,3 +164,10 @@ func xterm256color(r, g, b uint8, n int) (index uint8) {
} }
return return
} }
// sqDiff - just like from image/color/color.go
func sqDiff(x, y uint8) uint16 {
d := uint16(x - y)
//return d
return (d * d) >> 2
}