react-native-google-maps-plus/android/src/main/java/com/rngooglemapsplus/MapMarker.kt at faf8d5e7a0f79bfceb8454510e8e5ad3771fdbd2 · pinpong/react-native-google-maps-plus · GitHub

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package com.rngooglemapsplus

import android.graphics.Bitmap
import android.graphics.Canvas
import android.util.LruCache
import androidx.core.graphics.createBitmap
import com.caverock.androidsvg.SVG
import com.facebook.react.uimanager.PixelUtil.dpToPx
import com.google.android.gms.maps.model.BitmapDescriptor
import com.google.android.gms.maps.model.BitmapDescriptorFactory
import com.google.android.gms.maps.model.LatLng
import com.google.android.gms.maps.model.MarkerOptions
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.Job
import kotlinx.coroutines.SupervisorJob
import kotlinx.coroutines.ensureActive
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
import kotlin.coroutines.coroutineContext

class MarkerOptions(
  private val scope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Default),
) {
  private val iconCache =
    object : LruCache<Int, BitmapDescriptor>(512) {
      override fun sizeOf(
        key: Int,
        value: BitmapDescriptor,
      ): Int = 1
    }

  private val jobsById = mutableMapOf<String, Job>()

  fun build(
    m: RNMarker,
    icon: BitmapDescriptor,
  ): MarkerOptions =
    MarkerOptions()
      .position(LatLng(m.coordinate.latitude, m.coordinate.longitude))
      .zIndex(m.zIndex.toFloat())
      .icon(icon)
      .anchor((m.anchor?.x ?: 0.5).toFloat(), (m.anchor?.y ?: 0.5).toFloat())

  fun buildIconAsync(
    id: String,
    m: RNMarker,
    onReady: (BitmapDescriptor) -> Unit,
  ) {
    jobsById[id]?.cancel()

    val key = m.styleHash()
    iconCache.get(key)?.let { cached ->
      onReady(cached)
      return
    }

    val job =
      scope.launch {
        try {
          ensureActive()
          val bmp = renderBitmap(m)
          if (bmp != null) {
            ensureActive()
            val desc = BitmapDescriptorFactory.fromBitmap(bmp)
            iconCache.put(key, desc)
            bmp.recycle()
            withContext(Dispatchers.Main) {
              ensureActive()
              onReady(desc)
            }
          }
        } catch (_: OutOfMemoryError) {
          iconCache.evictAll()
        } catch (_: Throwable) {
        } finally {
          jobsById.remove(id)
        }
      }

    jobsById[id] = job
  }

  fun cancelIconJob(id: String) {
    jobsById[id]?.cancel()
    jobsById.remove(id)
  }

  fun cancelAllJobs() {
    val ids = jobsById.keys.toList()
    ids.forEach { id ->
      jobsById[id]?.cancel()
    }
    jobsById.clear()
    iconCache.evictAll()
  }

  private suspend fun renderBitmap(m: RNMarker): Bitmap? {
    var bmp: Bitmap? = null
    try {
      coroutineContext.ensureActive()
      val svg = SVG.getFromString(m.iconSvg)

      coroutineContext.ensureActive()
      svg.setDocumentWidth(m.width.dpToPx())
      svg.setDocumentHeight(m.height.dpToPx())

      coroutineContext.ensureActive()
      bmp =
        createBitmap(m.width.dpToPx().toInt(), m.height.dpToPx().toInt(), Bitmap.Config.ARGB_8888)

      coroutineContext.ensureActive()
      val canvas = Canvas(bmp)
      svg.renderToCanvas(canvas)

      coroutineContext.ensureActive()
      return bmp
    } catch (t: Throwable) {
      try {
        bmp?.recycle()
      } catch (_: Throwable) {
      }
      throw t
    }
  }
}

fun RNMarker.markerEquals(b: RNMarker): Boolean =
  id == b.id &&
    zIndex == b.zIndex &&
    coordinate == b.coordinate &&
    anchor == b.anchor &&
    markerStyleEquals(b)

fun RNMarker.markerStyleEquals(b: RNMarker): Boolean =
  width == b.width &&
    height == b.height &&
    iconSvg == b.iconSvg

fun RNMarker.styleHash(): Int =
  arrayOf<Any?>(
    width,
    height,
    iconSvg,
  ).contentHashCode()