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cap the light accent luminance so overlay text stays readable

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austinried
2026-10-04 00:29:53 +00:00
parent 121d793b72
commit cc63b58413
1 changed files with 19 additions and 1 deletions
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app/src/main/kotlin/com/subtracks/ui/theme/ArtworkTheme.kt
+19 -1
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@@ -33,6 +33,7 @@ import kotlin.random.Random
private const val SEED_ART_SIZE_PX = 128 private const val SEED_ART_SIZE_PX = 128
private const val GRADIENT_FADE_START = 1.3f / 2.0f private const val GRADIENT_FADE_START = 1.3f / 2.0f
private const val BLOB_ZONE = 0.62f private const val BLOB_ZONE = 0.62f
private const val ACCENT_MAX_LUMINANCE = 0.34f
data class ArtworkColors( data class ArtworkColors(
val scheme: ColorScheme, val scheme: ColorScheme,
@@ -105,11 +106,28 @@ fun artworkColorsFromSeeds(
scheme = scheme, scheme = scheme,
gradientHigh = tone(hue, (s * 0.85f).coerceAtMost(0.65f), 0.30f), gradientHigh = tone(hue, (s * 0.85f).coerceAtMost(0.65f), 0.30f),
gradientLow = tone(hue, s * 0.45f, 0.04f), gradientLow = tone(hue, s * 0.45f, 0.04f),
accents = listOf(tone(hue, s, 0.72f), secondary), accents =
listOf(
tone(hue, s, 0.72f).withMaxLuminance(ACCENT_MAX_LUMINANCE),
secondary.withMaxLuminance(ACCENT_MAX_LUMINANCE),
),
blobSeed = primarySeed, blobSeed = primarySeed,
) )
} }
private fun Color.withMaxLuminance(max: Float): Color {
if (luminance() <= max) return this
val (h, s, initial) = toHsl()
var lightness = initial
var color = this
var guard = 0
while (color.luminance() > max && guard++ < 30) {
lightness = (lightness - 0.02f).coerceAtLeast(0.05f)
color = Color.hsl(h, s, lightness)
}
return color
}
fun ArtworkColors.gradientColorAt(fraction: Float): Color { fun ArtworkColors.gradientColorAt(fraction: Float): Color {
val t = fraction.coerceIn(0f, 1f) val t = fraction.coerceIn(0f, 1f)
val base = lerp(gradientHigh, gradientLow, t) val base = lerp(gradientHigh, gradientLow, t)