class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()

        // 多分 UltraHDR を表示するのと同じ要領でこれが必要だと思う
        window.colorMode = ActivityInfo.COLOR_MODE_HDR
    }
}

Color(red = 1f, green = 0f, blue = 0f, alpha = 1f, colorSpace = ColorSpaces.Bt2020Hlg)

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()

        // 多分 UltraHDR を表示するのと同じ要領でこれが必要だと思う
        window.colorMode = ActivityInfo.COLOR_MODE_HDR

        setContent {
            JetpackComposeHdrColorTheme {
                MainScreen()
            }
        }
    }
}

@Composable
private fun MainScreen() {
    Scaffold { innerPadding ->
        Column(
            modifier = Modifier
                .padding(innerPadding)
                .fillMaxSize(),
            verticalArrangement = Arrangement.Center,
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            MessageCard(text = "SDR の色", colorSpace = ColorSpaces.Srgb) // sRGB が動画で言うところの Rec.709 (BT.709) にあたる
            MessageCard(text = "HDR の色", colorSpace = ColorSpaces.Bt2020Hlg)
            MessageCard(text = "眩しい広告！", colorSpace = ColorSpaces.Bt2020Hlg)

            Icon(
                painter = painterResource(R.drawable.ic_launcher_foreground),
                contentDescription = null,
                tint = Color(red = 1f, green = 0f, blue = 0f, alpha = 1f, colorSpace = ColorSpaces.Bt2020Hlg)
            )

            Box(
                modifier = Modifier
                    .size(200.dp)
                    .background(
                        Brush.horizontalGradient(
                            listOf(
                                Color(red = 1f, green = 0f, blue = 0f, alpha = 1f, colorSpace = ColorSpaces.Bt2020Hlg),
                                Color(red = 0f, green = 1f, blue = 0f, alpha = 1f, colorSpace = ColorSpaces.Bt2020Hlg),
                                Color(red = 0f, green = 0f, blue = 1f, alpha = 1f, colorSpace = ColorSpaces.Bt2020Hlg)
                            )
                        )
                    )
            )
        }
    }
}

@Composable
private fun MessageCard(
    modifier: Modifier = Modifier,
    text: String,
    colorSpace: ColorSpace
) {
    Box(modifier = modifier.background(Color(red = 1f, green = 1f, blue = 1f, alpha = 1f, colorSpace = colorSpace))) {
        Text(
            modifier = Modifier.padding(10.dp),
            text = text,
            fontSize = 50.sp,
            color = Color(red = 1f, green = 0f, blue = 0f, alpha = 1f, colorSpace = colorSpace)
        )
    }
}