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region decoder pool

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Thibault Deckers 2025-04-01 23:38:41 +02:00
parent 409d80df4e
commit e09b3e4440
1 changed files with 28 additions and 21 deletions
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49
android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/fetchers/RegionFetcher.kt
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@ -29,10 +29,6 @@ import kotlin.math.roundToInt
class RegionFetcher internal constructor(
private val context: Context,
) {
private var lastDecoderRef: LastDecoderRef? = null
private val exportUris = HashMap<Pair<Uri, Int?>, Uri>()
// return decoded bytes in ARGB_8888, with trailer bytes:
// - width (int32)
// - height (int32)
@ -63,24 +59,12 @@ class RegionFetcher internal constructor(
return
}
var currentDecoderRef = lastDecoderRef
if (currentDecoderRef != null && currentDecoderRef.requestKey != requestKey) {
currentDecoderRef = null
}
try {
if (currentDecoderRef == null) {
val newDecoder = StorageUtils.openInputStream(context, uri)?.use { input ->
BitmapRegionDecoderCompat.newInstance(input)
}
if (newDecoder == null) {
result.error("fetch-read-null", "failed to open file for mimeType=$mimeType uri=$uri regionRect=$regionRect", null)
return
}
currentDecoderRef = LastDecoderRef(requestKey, newDecoder)
val decoder = getOrCreateDecoder(uri, requestKey)
if (decoder == null) {
result.error("fetch-read-null", "failed to open file for mimeType=$mimeType uri=$uri regionRect=$regionRect", null)
return
}
val decoder = currentDecoderRef.decoder
lastDecoderRef = currentDecoderRef
// with raw images, the known image size may not match the decoded image size
// so we scale the requested region accordingly
@ -159,6 +143,26 @@ class RegionFetcher internal constructor(
}
}
private fun getOrCreateDecoder(uri: Uri, requestKey: Pair<Uri, Int?>): BitmapRegionDecoder? {
var decoderRef = decoderPool.firstOrNull { it.requestKey == requestKey }
if (decoderRef == null) {
val newDecoder = StorageUtils.openInputStream(context, uri)?.use { input ->
BitmapRegionDecoderCompat.newInstance(input)
}
if (newDecoder == null) {
return null
}
decoderRef = DecoderRef(requestKey, newDecoder)
} else {
decoderPool.remove(decoderRef)
}
decoderPool.add(0, decoderRef)
while (decoderPool.size > DECODER_POOL_SIZE) {
decoderPool.removeAt(decoderPool.size - 1)
}
return decoderRef.decoder
}
private fun createTemporaryJpegExport(uri: Uri, mimeType: String, pageId: Int?): Uri {
Log.d(LOG_TAG, "create JPEG export for uri=$uri mimeType=$mimeType pageId=$pageId")
val target = Glide.with(context)
@ -180,7 +184,7 @@ class RegionFetcher internal constructor(
}
}
private data class LastDecoderRef(
private data class DecoderRef(
val requestKey: Pair<Uri, Int?>,
val decoder: BitmapRegionDecoder,
)
@ -188,5 +192,8 @@ class RegionFetcher internal constructor(
companion object {
private val LOG_TAG = LogUtils.createTag<RegionFetcher>()
private val PREFERRED_CONFIG = Bitmap.Config.ARGB_8888
private const val DECODER_POOL_SIZE = 3
private val decoderPool = ArrayList<DecoderRef>()
private val exportUris = HashMap<Pair<Uri, Int?>, Uri>()
}
}