Test optimisation of MarqueeText

[yschimke]

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.drawWithCache
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.graphics.BlendMode
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.Canvas
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.CompositingStrategy
import androidx.compose.ui.graphics.compositeOver
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.drawText
import androidx.compose.ui.text.rememberTextMeasurer
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.wear.compose.material3.MaterialTheme
import androidx.wear.compose.material3.Text
import androidx.wear.compose.ui.tooling.preview.WearPreviewLargeRound

@WearPreviewLargeRound
@Composable
fun GradientProbs() {
    Column(
        modifier = Modifier.fillMaxSize().background(Brush.radialGradient(radialColors())),
        verticalArrangement = Arrangement.Center,
    ) {
        SomeBigText()
        SomeBigText(
            modifier =
                Modifier.graphicsLayer {
                    this.compositingStrategy = CompositingStrategy.Offscreen
                    clip = true
                }
        )
        SomeBigText2()
    }
}

@Composable
private fun SomeBigText(modifier: Modifier = Modifier) {
    Text(
        text = "SOME BIG TEXT",
        modifier =
            modifier.fillMaxWidth().drawWithCache {
                onDrawWithContent {
                    drawContent()
                    drawRect(
                        brush =
                            Brush.horizontalGradient(
                                listOf(
                                    Color.Transparent,
                                    Color.Black,
                                    Color.Black,
                                    Color.Transparent,
                                )
                            ),
                        blendMode = BlendMode.DstIn,
                    )
                }
            },
        style = TextStyle.Default.copy(fontSize = 30.sp),
        textAlign = TextAlign.Center,
    )
}

@Composable
private fun SomeBigText2(modifier: Modifier = Modifier) {
    val textMeasurer = rememberTextMeasurer()

    androidx.compose.foundation.Canvas(modifier = modifier.fillMaxWidth().height(50.dp)) {
        val textLayout =
            textMeasurer.measure("SOME BIG TEXT", style = TextStyle.Default.copy(fontSize = 30.sp))
        drawText(
            textLayout,
            brush =
                Brush.horizontalGradient(
                    listOf(Color.Transparent, Color.White, Color.White, Color.Transparent)
                ),
            topLeft = Offset((size.width - textLayout.size.width) / 2f, 0f),
        )
    }
}

@Composable
fun radialColors() =
    listOf(
        (Color.Red).copy(alpha = 0.5f).compositeOver(MaterialTheme.colorScheme.background),
        (Color.Blue).copy(alpha = 0.1f).compositeOver(MaterialTheme.colorScheme.background),
    )