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refactor(qr): match QR pixel pairs to half-block glyphs

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This commit is contained in:
ayn2op 2026-05-21 21:27:08 -04:00
parent 2d027f54c3
commit d3b5c21263
1 changed files with 17 additions and 13 deletions
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30
internal/ui/login/qr/model.go
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@ -108,6 +108,21 @@ func (m *Model) Update(msg tview.Msg) tview.Cmd {
return nil
}
// halfBlock packs a vertical pair of QR pixels into one glyph, fitting two
// bitmap rows into a single terminal row.
func halfBlock(top, bottom bool) rune {
switch [2]bool{top, bottom} {
case [2]bool{true, true}:
return '█'
case [2]bool{true, false}:
return '▀'
case [2]bool{false, true}:
return '▄'
default:
return ' '
}
}
func (m *Model) View(screen tcell.Screen) {
var contents []string
if m.qrCode != nil {
@ -116,19 +131,8 @@ func (m *Model) View(screen tcell.Screen) {
for y := 0; y < len(bitmap); y += 2 {
for x := range bitmap[y] {
top := bitmap[y][x]
bottom := false
if y+1 < len(bitmap) {
bottom = bitmap[y+1][x]
}
if top && bottom {
b.WriteString("█")
} else if top && !bottom {
b.WriteString("▀")
} else if !top && bottom {
b.WriteString("▄")
} else {
b.WriteByte(' ')
}
bottom := y+1 < len(bitmap) && bitmap[y+1][x]
b.WriteRune(halfBlock(top, bottom))
}
b.WriteByte('\n')
}