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Improves the async rendering of Base64 content
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amethyst/src/main/java/com/vitorpamplona/amethyst/service/Base64Image.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| /** | ||
| * Copyright (c) 2024 Vitor Pamplona | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy of | ||
| * this software and associated documentation files (the "Software"), to deal in | ||
| * the Software without restriction, including without limitation the rights to use, | ||
| * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the | ||
| * Software, and to permit persons to whom the Software is furnished to do so, | ||
| * subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in all | ||
| * copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | ||
| * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR | ||
| * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN | ||
| * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION | ||
| * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
| */ | ||
| package com.vitorpamplona.amethyst.service | ||
|
|
||
| import android.content.Context | ||
| import android.graphics.BitmapFactory | ||
| import android.net.Uri | ||
| import androidx.compose.runtime.Stable | ||
| import androidx.core.graphics.drawable.toDrawable | ||
| import coil.ImageLoader | ||
| import coil.decode.DataSource | ||
| import coil.fetch.DrawableResult | ||
| import coil.fetch.FetchResult | ||
| import coil.fetch.Fetcher | ||
| import coil.request.ImageRequest | ||
| import coil.request.Options | ||
| import com.vitorpamplona.amethyst.commons.richtext.RichTextParser.Companion.base64contentPattern | ||
| import java.util.Base64 | ||
|
|
||
| @Stable | ||
| class Base64Fetcher( | ||
| private val options: Options, | ||
| private val data: Uri, | ||
| ) : Fetcher { | ||
| override suspend fun fetch(): FetchResult { | ||
| checkNotInMainThread() | ||
|
|
||
| val matcher = base64contentPattern.matcher(data.toString()) | ||
|
|
||
| if (matcher.find()) { | ||
| val base64String = matcher.group(2) | ||
|
|
||
| val byteArray = Base64.getDecoder().decode(base64String) | ||
| val bitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.size) ?: throw Exception("Unable to load base64 $base64String") | ||
|
|
||
| return DrawableResult( | ||
| drawable = bitmap.toDrawable(options.context.resources), | ||
| isSampled = false, | ||
| dataSource = DataSource.MEMORY, | ||
| ) | ||
| } else { | ||
| throw Exception("Unable to load base64 $data") | ||
| } | ||
| } | ||
|
|
||
| object Factory : Fetcher.Factory<Uri> { | ||
| override fun create( | ||
| data: Uri, | ||
| options: Options, | ||
| imageLoader: ImageLoader, | ||
| ): Fetcher? { | ||
| return if (base64contentPattern.matcher(data.toString()).find()) { | ||
| return Base64Fetcher(options, data) | ||
| } else { | ||
| null | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| object Base64Requester { | ||
| fun imageRequest( | ||
| context: Context, | ||
| message: String, | ||
| ): ImageRequest = | ||
| ImageRequest | ||
| .Builder(context) | ||
| .data(message) | ||
| .fetcherFactory(Base64Fetcher.Factory) | ||
| .build() | ||
| } |
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