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fix(tui): reduce tab pulse allocations (#39433)

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Kit Langton 2026-07-28 22:43:46 -04:00 • committed by GitHub
commit b47cfbee7c
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2 changed files with 57 additions and 12 deletions
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46
packages/tui/src/component/tab-pulse.tsx
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@ -1,6 +1,5 @@
import { OptimizedBuffer, Renderable, RGBA, type RenderableOptions, type RenderContext } from "@opentui/core"
import { extend } from "@opentui/solid"
import { tint } from "../theme/color"
type TabPulseOptions = RenderableOptions<TabPulseRenderable> & {
enabled?: boolean
@ -23,6 +22,7 @@ const COMPLETION_DURATION = 900
const COMPLETION_ATTACK = 0.16
const GLOW_TAIL = 12
const GLOW_OPACITY = 0.16
const DEFAULT_FOREGROUND = RGBA.defaultForeground()
const intensityAt = (index: number, front: number, head: number, tail: number) => {
const distance = front - index
return distance < 0 ? smootherstep(clamp(1 + distance / head)) : smootherstep(clamp(1 - distance / tail))
@ -41,6 +41,26 @@ export const unreadGlowIntensity = (index: number, width: number) => {
const tail = Math.min(GLOW_TAIL, Math.max(1, width - 2))
return smootherstep(clamp(1 - Math.max(0, index - 1) / tail))
}
export function blendTabPulseColor(
output: RGBA,
background: RGBA,
glowColor: RGBA,
runningColor: RGBA,
completionColor: RGBA,
glow: number,
running: number,
completion: number,
) {
output.r = background.r + (glowColor.r - background.r) * glow
output.g = background.g + (glowColor.g - background.g) * glow
output.b = background.b + (glowColor.b - background.b) * glow
output.r += (runningColor.r - output.r) * running
output.g += (runningColor.g - output.g) * running
output.b += (runningColor.b - output.b) * running
output.r += (completionColor.r - output.r) * completion
output.g += (completionColor.g - output.g) * completion
output.b += (completionColor.b - output.b) * completion
}
class TabPulseRenderable extends Renderable {
private _enabled: boolean
private _active: boolean
@ -54,6 +74,7 @@ class TabPulseRenderable extends Renderable {
private fadeClock: number | undefined
private completionClock: number | undefined
private completionPending = false
private renderColor = RGBA.fromInts(0, 0, 0)
constructor(ctx: RenderContext, options: TabPulseOptions = {}) {
const enabled = options.enabled ?? true
@ -191,17 +212,20 @@ class TabPulseRenderable extends Renderable {
intensityAt(index, front, RUN_HEAD, RUN_TAIL),
intensityAt(index, secondFront, RUN_HEAD, RUN_TAIL),
)
const background = this._glow
? tint(this._backgroundColor, this._glowColor, unreadGlowIntensity(index, this.width) * GLOW_OPACITY)
: this._backgroundColor
const running = tint(background, this._color, intensity * 0.14 * runningOpacity)
buffer.setCell(
this.screenX + index,
this.screenY,
" ",
RGBA.defaultForeground(),
tint(running, this._completionColor, completionOpacity * 0.18),
const glow = this._glow ? unreadGlowIntensity(index, this.width) * GLOW_OPACITY : 0
const running = intensity * 0.14 * runningOpacity
const completion = completionOpacity * 0.18
blendTabPulseColor(
this.renderColor,
this._backgroundColor,
this._glowColor,
this._color,
this._completionColor,
glow,
running,
completion,
)
buffer.setCell(this.screenX + index, this.screenY, " ", DEFAULT_FOREGROUND, this.renderColor)
}
}
}