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Paywalls: backwards compatible blurring (#1327)
Add backwards compatible blur. This has 3 different ways of applying blur: - through native blur in API 31+ - through averaging the pixels in the image, based on https://github.com/T8RIN/BlurTransformation - through RenderScript in API < 31 It also adds some logic to benchmark... But I've been having a tough time actually running the benchmarks. From multiDex to instrumentation tests and roboelectric, it's been fun. Will reach out tomorrow to android devs for a hand in actually running the benchmarks. --------- Co-authored-by: NachoSoto <ignaciosoto90@gmail.com>
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60 changes: 60 additions & 0 deletions
60
...ui/src/main/kotlin/com/revenuecat/purchases/ui/revenuecatui/helpers/BlurTransformation.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| 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 coil.size.Size | ||
| import coil.transform.Transformation | ||
| import kotlin.math.min | ||
|
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||
| /** | ||
| * BlurTransformation class applies a blur on a given Bitmap image. | ||
| * The blurring is performed with RenderScript, and should only be used in API level < 31, since newer versions | ||
| * of Android have their own native blur implementation. | ||
| * | ||
| * @property radius - The radius of the square used for blurring. Higher values | ||
| * produce a more pronounced blur effect. | ||
| */ | ||
| internal class BlurTransformation( | ||
| private val context: Context, | ||
| private val radius: Float, | ||
| ) : Transformation { | ||
| override val cacheKey: String = "${javaClass.name}-$radius" | ||
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| override suspend fun transform( | ||
| input: Bitmap, | ||
| size: Size, | ||
| ): Bitmap { | ||
| return input.blur(context, radius) | ||
| } | ||
| } | ||
|
|
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| // max radius supported by RenderScript | ||
| private const val MAX_SUPPORTED_RADIUS = 25f | ||
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| internal fun Bitmap.blur(context: Context, radius: Float = MAX_SUPPORTED_RADIUS): Bitmap { | ||
| if (radius < 1f) { | ||
| return this@blur | ||
| } | ||
| val updatedRadius = min(radius.toDouble(), MAX_SUPPORTED_RADIUS.toDouble()) | ||
|
|
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| val rs = RenderScript.create(context) | ||
| val input = Allocation.createFromBitmap(rs, this) | ||
| val output = Allocation.createTyped(rs, input.type) | ||
| val script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)) | ||
|
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| script.setRadius(updatedRadius.toFloat()) | ||
| script.setInput(input) | ||
| script.forEach(output) | ||
|
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| val blurredBitmap = Bitmap.createBitmap(width, height, config) | ||
| output.copyTo(blurredBitmap) | ||
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| input.destroy() | ||
| output.destroy() | ||
| script.destroy() | ||
| rs.destroy() | ||
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| return blurredBitmap | ||
| } |
45 changes: 45 additions & 0 deletions
45
...tui/src/test/kotlin/com/revenuecat/purchases/ui/revenuecatui/helpers/BlurBenchmarkTest.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| package com.revenuecat.purchases.ui.revenuecatui.helpers | ||
|
|
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| import android.content.ContentValues.TAG | ||
| import android.content.Context | ||
| import android.graphics.Bitmap | ||
| import android.graphics.BitmapFactory | ||
| import android.util.Log | ||
| import androidx.test.ext.junit.runners.AndroidJUnit4 | ||
| import androidx.test.platform.app.InstrumentationRegistry | ||
| import blur | ||
| import kotlinx.coroutines.runBlocking | ||
| import org.junit.Ignore | ||
| import org.junit.Test | ||
| import org.junit.runner.RunWith | ||
|
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| @RunWith(AndroidJUnit4::class) | ||
| class BlurBenchmarkTest { | ||
| @Ignore("Test is for checking performance only") | ||
| @Test | ||
| fun `Blur images using native blur`() = runBlocking { | ||
| benchmarkBlur("Native Blur") { image, context, radius -> | ||
| image.blur(context = context, radius = radius) | ||
| } | ||
| } | ||
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| private suspend fun benchmarkBlur(functionName: String, blurFunction: suspend (Bitmap, Context, Float) -> Unit) { | ||
| val context = InstrumentationRegistry.getInstrumentation().targetContext | ||
| val image = openImage() | ||
| val radius = 25f | ||
| val iterations = 100 | ||
| val startTime = System.currentTimeMillis() | ||
| repeat(iterations) { | ||
| blurFunction(image, context, radius) | ||
| } | ||
| val endTime = System.currentTimeMillis() | ||
| val totalTime = endTime - startTime | ||
| val averageTime = totalTime / iterations | ||
| Log.d(TAG, "$functionName:\nTotal time: $totalTime ms, Average time: $averageTime ms") | ||
| } | ||
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| private fun openImage(): Bitmap { | ||
| val inputStream = javaClass.classLoader!!.getResource("sample_blurring_image.jpeg").openStream() | ||
| return BitmapFactory.decodeStream(inputStream) | ||
| } | ||
| } |
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