add RenderScript sample

Author: SmartToolFactory

Tutorial1-1Basics/src/main/java/com/smarttoolfactory/tutorial1_1basics/chapter6_graphics/Tutorial6_40_1RenderScript1.kt

@@ -0,0 +1,132 @@
+@file:Suppress("DEPRECATION")
+
+package com.smarttoolfactory.tutorial1_1basics.chapter6_graphics
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.renderscript.Allocation
+import android.renderscript.Element
+import android.renderscript.RenderScript
+import android.renderscript.ScriptIntrinsicBlur
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.Slider
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.ImageBitmap
+import androidx.compose.ui.graphics.asAndroidBitmap
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.imageResource
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import com.smarttoolfactory.tutorial1_1basics.R
+import com.smarttoolfactory.tutorial1_1basics.ui.components.StyleableTutorialText
+import com.smarttoolfactory.tutorial1_1basics.ui.components.TutorialHeader
+import com.smarttoolfactory.tutorial1_1basics.ui.components.TutorialText2
+import kotlin.math.roundToInt
+
+
+@Preview
+@Composable
+fun Tutorial6_40Screen1() {
+ TutorialContent()
+}
+
+
+@Composable
+private fun TutorialContent() {
+ Column(modifier = Modifier.padding(8.dp)) {
+ TutorialHeader(text = "RenderScript")
+ StyleableTutorialText(
+ text = "Blue Bitmap using **RenderScript**",
+ bullets = false
+ )
+ RenderScriptBlursample()
+ }
+}
+
+@Preview
+@Composable
+private fun RenderScriptBlursample() {
+
+ Column(
+ modifier = Modifier.fillMaxSize().verticalScroll(rememberScrollState())
+ ) {
+
+ val imageBitmap = ImageBitmap.imageResource(R.drawable.landscape10)
+
+ var blurRadius by remember {
+ mutableFloatStateOf(10f)
+ }
+
+ val context = LocalContext.current
+
+ val blurredBitmap by remember(imageBitmap, blurRadius) {
+ mutableStateOf(blurBitmap(context, imageBitmap.asAndroidBitmap(), blurRadius))
+ }
+
+ TutorialText2(text = "Default")
+
+ Image(
+ modifier = Modifier.fillMaxWidth().aspectRatio(3 / 2f),
+ bitmap = imageBitmap,
+ contentDescription = null,
+ contentScale = ContentScale.FillBounds
+ )
+
+
+ TutorialText2(text = "Blurred")
+ Image(
+ modifier = Modifier.fillMaxWidth().aspectRatio(3 / 2f),
+ bitmap = blurredBitmap.asImageBitmap(),
+ contentDescription = null,
+ contentScale = ContentScale.FillBounds
+ )
+
+
+ Text("Blur radius: ${blurRadius.roundToInt()}")
+
+ Slider(
+ modifier = Modifier.padding(horizontal = 16.dp),
+ value = blurRadius,
+ onValueChange = {
+ blurRadius = it
+ },
+ valueRange = 0.01f..25f
+ )
+ }
+}
+
+fun blurBitmap(context: Context, bitmap: Bitmap, blurRadius: Float): Bitmap {
+
+ val bitmapToBlur = bitmap.copy(Bitmap.Config.ARGB_8888, true)
+
+ val renderScript = RenderScript.create(context)
+ val input = Allocation.createFromBitmap(renderScript, bitmapToBlur)
+ val output = Allocation.createTyped(renderScript, input.type)
+
+ ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript)).apply {
+ setRadius(blurRadius)
+ setInput(input)
+ forEach(output)
+ }
+
+ output.copyTo(bitmapToBlur)
+ renderScript.destroy()
+
+ return bitmapToBlur
+}