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fix(desktop): keep the diffusion placeholder circular at any aspect

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Normalise the radial bloom by the shorter side so portrait/square
placeholders aren't squished into an ellipse.
This commit is contained in:
Brooklyn Nicholson 2026-06-13 02:45:34 -05:00
parent b15dc58064
commit b82d2e549f
1 changed files with 8 additions and 5 deletions
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13
apps/desktop/src/components/chat/image-generation-placeholder.tsx
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@ -141,6 +141,9 @@ const drawAsciiDiffusion = (
const cellHeight = fontSize * 1.28
const cols = Math.ceil(width / cellWidth)
const rows = Math.ceil(height / cellHeight)
// Normalise both axes by the shorter side so the radial bloom stays a circle
// (not a squished ellipse) when the frame isn't landscape.
const short = Math.min(width, height)
const centerX = 0.53 + Math.sin(time * 0.055) * 0.02
const centerY = 0.5 + Math.cos(time * 0.048) * 0.02
const timestep = Math.floor(time * 1.15)
@ -154,10 +157,10 @@ const drawAsciiDiffusion = (
for (let col = -1; col <= cols + 1; col += 1) {
const x = col * cellWidth + cellWidth * 0.5
const y = row * cellHeight + cellHeight * 0.5
const nx = x / width
const ny = y / height
const dx = (nx - centerX) * 1.2
const dy = (ny - centerY) * 0.95
const sx = (x - centerX * width) / short
const sy = (y - centerY * height) / short
const dx = sx * 1.2
const dy = sy * 0.95
const radius = Math.hypot(dx, dy)
const angle = Math.atan2(dy, dx)
@ -168,7 +171,7 @@ const drawAsciiDiffusion = (
const contour =
Math.exp(-((Math.sin(angle * 3 + radius * 17 - time * 0.17) * 0.5 + 0.5 - radius) ** 2) / 0.016) * 0.38
const stem = Math.exp(-((nx - centerX + 0.05) ** 2 / 0.004 + (ny - centerY - 0.25) ** 2 / 0.08)) * 0.46
const stem = Math.exp(-((sx + 0.05) ** 2 / 0.004 + (sy - 0.25) ** 2 / 0.08)) * 0.46
const latent = clamp(bloom + contour + stem, 0, 1)
const staticA = hash2(col + timestep * 19, row - timestep * 11)