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Moves SVG generation to fetcher (IO) and avoids the use of TrimIndent, which is too slow (2-10ms each) for this context.

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This commit is contained in:
Vitor Pamplona 2023-03-13 17:38:30 -04:00
parent ea63522745
commit bb6b4c208d
1 changed files with 52 additions and 18 deletions
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70
app/src/main/java/com/vitorpamplona/amethyst/ui/components/Robohash.kt
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@ -1,11 +1,20 @@
package com.vitorpamplona.amethyst.ui.components
import android.content.Context
import android.net.Uri
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.toArgb
import coil.ImageLoader
import coil.decode.DataSource
import coil.decode.ImageSource
import coil.fetch.Fetcher
import coil.fetch.SourceResult
import coil.request.ImageRequest
import java.nio.ByteBuffer
import coil.request.Options
import okio.Buffer
import java.security.MessageDigest
import kotlin.time.ExperimentalTime
import kotlin.time.measureTimedValue
private fun toHex(color: Color): String {
val argb = color.toArgb()
@ -40,29 +49,54 @@ private fun svgString(msg: String): String {
val mouth = mouths[mouthIndex]
val accessory = accessories[accIndex]
return """
<svg id="$hashHex" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 300 300">
<defs>
<style>
.cls-bg{fill:${toHex(bgColor)}}.cls-fill-1{fill:${toHex(fgColor)};}.cls-fill-2{fill:${toHex(fgColor)};}
${body.style}${face.style}${eye.style}${mouth.style}${accessory.style}
</style>
</defs>
<title>Robohash $hashHex</title>
${background}${body.paths}${face.paths}${eye.paths}${mouth.paths}${accessory.paths}
</svg>
""".trimIndent()
return """<svg id="$hashHex" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 300 300">
<defs>
<style>
.cls-bg{fill:${toHex(bgColor)}}.cls-fill-1{fill:${toHex(fgColor)};}.cls-fill-2{fill:${toHex(fgColor)};}
${body.style}${face.style}${eye.style}${mouth.style}${accessory.style}
</style>
</defs>
<title>Robohash $hashHex</title>
${background}${body.paths}${face.paths}${eye.paths}${mouth.paths}${accessory.paths}
</svg>"""
}
class HashImageFetcher(
private val context: Context,
private val data: Uri
) : Fetcher {
@OptIn(ExperimentalTime::class)
override suspend fun fetch(): SourceResult {
val (value, elapsed) = measureTimedValue {
val source = try {
Buffer().apply { write(svgString(data.toString()).toByteArray()) }
} finally {
}
SourceResult(
source = ImageSource(source, context),
mimeType = null,
dataSource = DataSource.MEMORY
)
}
println("Elapsed: $elapsed")
return value
}
class Factory : Fetcher.Factory<Uri> {
override fun create(data: Uri, options: Options, imageLoader: ImageLoader): Fetcher {
return HashImageFetcher(options.context, data)
}
}
}
object Robohash {
fun imageRequest(context: Context, message: String): ImageRequest {
return ImageRequest
.Builder(context)
.data(
ByteBuffer.wrap(
svgString(message).toByteArray()
)
)
.data("robohash:$message")
.fetcherFactory(HashImageFetcher.Factory())
.crossfade(100)
.build()
}