Another yet high performance HCT (Kyant) color space and dynamic color scheme library for Android Jetpack Compose.
Compared to the Google's HCT, the HCT (Kyant) color space has the following advantages:
- It supports the P3 color space
- It doesn't have the blue-purple shift issue
- It's faster to compute one color (about 0.02ms in the worst case)
- It's more numerically accurate
- Add the dependency
allprojects {
repositories {
maven("https://jitpack.io")
}
}
implementation("com.github.Kyant0:HCT:<version>")- Initialize the library
System.loadLibrary("com.kyant.hct")
Hct.init(useP3 = true)- Create a raw
HCT
val hct = Hct(hue = 240.0, chroma = 20.0, tone = 40.0)Note: chroma < 28.0 for every color in P3 color space
- Convert
HCTtoColor
hct.toColor()- Create a
DynamicScheme
val isDark = isSystemInDarkTheme()
val scheme = remember(isDark) {
DynamicScheme(
sourceColorHct = hct,
style = SchemeStyle.TonalSpot,
isDark = isDark
)
}Note: Predefined scheme styles may not be the same as the Google's due to the different chroma scale
- Use color roles
scheme.primary
scheme.primaryContainer
// ... and moreNote: The library doesn't provide the deprecated colors roles, for example background, please
use surfaceContainerXXX instead
- Create a custom
SchemeStyle
val SchemeYou = object : SchemeStyle {
override val primaryPaletteStyle = TonalPaletteStyle(chroma = { 15.0 })
override val secondaryPaletteStyle = TonalPaletteStyle({ 5.0 })
override val tertiaryPaletteStyle = TonalPaletteStyle({ 10.0 }, hue = { it.hue 120.0 })
override val neutralPaletteStyle = TonalPaletteStyle({ 0.0 })
override val neutralVariantPaletteStyle = TonalPaletteStyle({ 2.0 })
override val errorPaletteStyle = TonalPaletteStyle({ 28.0 }, { 20.0 })
}- M. Safdar, J. Hardeberg, and M. Ronnier Luo, "ZCAM, a colour appearance model based on a high dynamic range uniform colour space," Opt. Express 29, 6036-6052 (2021).
- Qiyan Zhai and Ming R. Luo, "Study of chromatic adaptation via neutral white matches on different viewing media," Opt. Express 26, 7724-7739 (2018)