Gjallarhorn: Refactor Rendering Code

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/commands/BlockLogReplay.kt

@@ -1,8 +1,10 @@
 package cloud.kubelet.foundation.gjallarhorn.commands
 
+import cloud.kubelet.foundation.gjallarhorn.render.BlockDiversityRenderer
+import cloud.kubelet.foundation.gjallarhorn.render.BlockHeightMapRenderer
+import cloud.kubelet.foundation.gjallarhorn.render.BlockImageRenderer
+import cloud.kubelet.foundation.gjallarhorn.state.*
 import cloud.kubelet.foundation.gjallarhorn.util.compose
-import cloud.kubelet.foundation.gjallarhorn.render.*
-import cloud.kubelet.foundation.gjallarhorn.util.RandomColorKey
 import cloud.kubelet.foundation.gjallarhorn.util.savePngFile
 import cloud.kubelet.foundation.heimdall.view.BlockChangeView
 import com.github.ajalt.clikt.core.CliktCommand
@@ -17,7 +19,6 @@ import org.jetbrains.exposed.sql.*
 import org.jetbrains.exposed.sql.SqlExpressionBuilder.lessEq
 import org.jetbrains.exposed.sql.transactions.transaction
 import org.slf4j.LoggerFactory
-import java.awt.image.BufferedImage
 import java.time.Duration
 import java.time.Instant
 import java.util.concurrent.ConcurrentHashMap
@@ -60,7 +61,7 @@ class BlockLogReplay : CliktCommand("Replay Block Logs", name = "replay-block-lo
       }
 
       val trackerPool = ScheduledThreadPoolExecutor(8)
-      val trackers = ConcurrentHashMap<Int, BlockStateTracker>()
+      val trackers = ConcurrentHashMap<Int, BlockLogTracker>()
       for (time in intervals) {
         trackerPool.submit {
           val index = intervals.indexOf(time) + 1
@@ -77,19 +78,20 @@ class BlockLogReplay : CliktCommand("Replay Block Logs", name = "replay-block-lo
       }
       logger.info("State Tracking Completed")
       val allBlockOffsets = trackers.map { it.value.calculateZeroBlockOffset() }
-      val globalBlockOffset = BlockPosition.maxOf(allBlockOffsets.asSequence())
+      val globalBlockOffset = BlockCoordinate.maxOf(allBlockOffsets.asSequence())
       val allBlockMaxes = trackers.map { it.value.calculateMaxBlock() }
-      val globalBlockMax = BlockPosition.maxOf(allBlockMaxes.asSequence())
+      val globalBlockMax = BlockCoordinate.maxOf(allBlockMaxes.asSequence())
       val globalBlockExpanse = BlockExpanse.offsetAndMax(globalBlockOffset, globalBlockMax)
 
       logger.info("Calculations Completed")
 
-      val renderState = render.createState()
+      val renderer = render.create(globalBlockExpanse)
       val renderPool = ScheduledThreadPoolExecutor(16)
+      val imagePadCount = trackers.size.toString().length
       for ((i, tracker) in trackers.entries) {
         renderPool.submit {
-          val count = trackers.size.toString().length
-          saveRenderImage(renderState, tracker, globalBlockExpanse, "-${i.toString().padStart(count, '0')}")
+          val suffix = "-${i.toString().padStart(imagePadCount, '0')}"
+          saveRenderImage(renderer, tracker, globalBlockExpanse, suffix)
           logger.info("Rendered Timelapse $i")
         }
       }
@@ -102,25 +104,24 @@ class BlockLogReplay : CliktCommand("Replay Block Logs", name = "replay-block-lo
       val time = if (exactTimeAsString != null) Instant.parse(exactTimeAsString) else null
       val tracker = buildTrackerState(time, "Single-Time")
       val expanse = BlockExpanse.offsetAndMax(tracker.calculateZeroBlockOffset(), tracker.calculateMaxBlock())
-      saveRenderImage(render.createState(), tracker, expanse)
+      saveRenderImage(render.create(expanse), tracker, expanse)
     }
   }
 
-  fun saveRenderImage(renderState: Any, tracker: BlockStateTracker, expanse: BlockExpanse, suffix: String = "") {
-    val state = BlockStateImage()
-    tracker.populateStateImage(state, expanse.offset)
-    val image = render.renderBufferedImage(renderState, state, expanse)
+  fun saveRenderImage(renderer: BlockImageRenderer, tracker: BlockLogTracker, expanse: BlockExpanse, suffix: String = "") {
+    val map = tracker.buildBlockMap(expanse.offset)
+    val image = renderer.render(map)
     image.savePngFile("${render.id}${suffix}.png")
   }
 
-  fun buildTrackerState(time: Instant?, job: String): BlockStateTracker {
+  fun buildTrackerState(time: Instant?, job: String): BlockLogTracker {
     val filter = compose(
       combine = { a, b -> a and b },
       { time != null } to { BlockChangeView.time lessEq time!! }
     )
 
     val tracker =
-      BlockStateTracker(if (considerAirBlocks) BlockTrackMode.AirOnDelete else BlockTrackMode.RemoveOnDelete)
+      BlockLogTracker(if (considerAirBlocks) BlockTrackMode.AirOnDelete else BlockTrackMode.RemoveOnDelete)
 
     val blockChangeCounter = AtomicLong()
     transaction(db) {
@@ -131,7 +132,7 @@ class BlockLogReplay : CliktCommand("Replay Block Logs", name = "replay-block-lo
         val z = row[BlockChangeView.z]
         val block = row[BlockChangeView.block]
 
-        val location = BlockPosition(x.toLong(), y.toLong(), z.toLong())
+        val location = BlockCoordinate(x.toLong(), y.toLong(), z.toLong())
         if (changeIsBreak) {
           tracker.delete(location)
         } else {
@@ -152,7 +153,7 @@ class BlockLogReplay : CliktCommand("Replay Block Logs", name = "replay-block-lo
     return tracker
   }
 
-  fun maybeTrimState(tracker: BlockStateTracker) {
+  fun maybeTrimState(tracker: BlockLogTracker) {
     if (fromCoordinate == null || toCoordinate == null) {
       return
     }
@@ -160,8 +161,8 @@ class BlockLogReplay : CliktCommand("Replay Block Logs", name = "replay-block-lo
     val from = fromCoordinate!!.split(",").map { it.toLong() }
     val to = toCoordinate!!.split(",").map { it.toLong() }
 
-    val fromBlock = BlockPosition(from[0], 0, from[1])
-    val toBlock = BlockPosition(to[0], 0, to[1])
+    val fromBlock = BlockCoordinate(from[0], 0, from[1])
+    val toBlock = BlockCoordinate(to[0], 0, to[1])
 
     tracker.trimOutsideXAndZRange(fromBlock, toBlock)
   }
@@ -169,17 +170,12 @@ class BlockLogReplay : CliktCommand("Replay Block Logs", name = "replay-block-lo
   @Suppress("unused")
   enum class RenderType(
     val id: String,
-    val createState: () -> Any,
-    val renderBufferedImage: (Any, BlockStateImage, BlockExpanse) -> BufferedImage
+    val create: (BlockExpanse) -> BlockImageRenderer
   ) {
-    TopDown("top-down",
-      { TopDownState(RandomColorKey()) },
-      { state, image, expanse -> image.buildTopDownImage(expanse, (state as TopDownState).randomColorKey) }),
-    HeightMap("height-map", { }, { _, image, expanse -> image.buildHeightMapImage(expanse) })
+    BlockDiversity("block-diversity", { expanse -> BlockDiversityRenderer(expanse) }),
+    HeightMap("height-map", { expanse -> BlockHeightMapRenderer(expanse) })
   }
 
-  class TopDownState(val randomColorKey: RandomColorKey)
-
   @Suppress("unused")
   enum class TimelapseMode(val id: String, val interval: Duration) {
     ByHour("hours", Duration.ofHours(1)),

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/render/BlockDiversityRenderer.kt

@@ -0,0 +1,27 @@
+package cloud.kubelet.foundation.gjallarhorn.render
+
+import cloud.kubelet.foundation.gjallarhorn.state.BlockExpanse
+import cloud.kubelet.foundation.gjallarhorn.state.BlockMap
+import cloud.kubelet.foundation.gjallarhorn.util.RandomColorKey
+import java.awt.Color
+import java.awt.image.BufferedImage
+
+class BlockDiversityRenderer(val expanse: BlockExpanse, quadPixelSize: Int = defaultQuadPixelSize) : BlockGridRenderer(quadPixelSize) {
+  private val randomColorKey = RandomColorKey()
+
+  override fun render(map: BlockMap): BufferedImage = buildPixelQuadImage(expanse) { x, z ->
+    val maybeYBlocks = map.blocks[x]?.get(z)
+    if (maybeYBlocks == null) {
+      setPixelQuad(x, z, Color.white.rgb)
+      return@buildPixelQuadImage
+    }
+    val maxBlockState = maybeYBlocks.maxByOrNull { it.key }?.value
+    if (maxBlockState == null) {
+      setPixelQuad(x, z, Color.white.rgb)
+      return@buildPixelQuadImage
+    }
+
+    val color = randomColorKey.map(maxBlockState.type)
+    setPixelQuad(x, z, color.rgb)
+  }
+}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/render/BlockExpanse.kt

@@ -1,13 +0,0 @@
-package cloud.kubelet.foundation.gjallarhorn.render
-
-class BlockExpanse(
-  val offset: BlockPosition,
-  val size: BlockPosition
-) {
-  companion object {
-    fun offsetAndMax(offset: BlockPosition, max: BlockPosition) = BlockExpanse(
-      offset,
-      offset.applyAsOffset(max)
-    )
-  }
-}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/render/BlockGridRenderer.kt

@@ -0,0 +1,42 @@
+package cloud.kubelet.foundation.gjallarhorn.render
+
+import cloud.kubelet.foundation.gjallarhorn.state.BlockExpanse
+import java.awt.Color
+import java.awt.Rectangle
+import java.awt.image.BufferedImage
+
+abstract class BlockGridRenderer(val quadPixelSize: Int = defaultQuadPixelSize) : BlockImageRenderer {
+  protected fun BufferedImage.setPixelQuad(x: Long, z: Long, rgb: Int) {
+    drawSquare(x * quadPixelSize, z * quadPixelSize, quadPixelSize.toLong(), rgb)
+  }
+
+  protected fun BufferedImage.drawSquare(x: Long, y: Long, side: Long, rgb: Int) {
+    val graphics = createGraphics()
+    graphics.color = Color(rgb)
+    graphics.fill(Rectangle(x.toInt(), y.toInt(), side.toInt(), side.toInt()))
+    graphics.dispose()
+  }
+
+  protected fun buildPixelQuadImage(
+    expanse: BlockExpanse,
+    callback: BufferedImage.(Long, Long) -> Unit
+  ): BufferedImage {
+    val widthInBlocks = expanse.size.x
+    val heightInBlocks = expanse.size.z
+    val widthInPixels = widthInBlocks.toInt() * quadPixelSize
+    val heightInPixels = heightInBlocks.toInt() * quadPixelSize
+    val bufferedImage =
+      BufferedImage(widthInPixels, heightInPixels, BufferedImage.TYPE_4BYTE_ABGR)
+
+    for (x in 0 until widthInBlocks) {
+      for (z in 0 until heightInBlocks) {
+        callback(bufferedImage, x, z)
+      }
+    }
+    return bufferedImage
+  }
+
+  companion object {
+    const val defaultQuadPixelSize = 4
+  }
+}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/render/BlockHeatMapRenderer.kt

@@ -0,0 +1,22 @@
+package cloud.kubelet.foundation.gjallarhorn.render
+
+import cloud.kubelet.foundation.gjallarhorn.state.BlockExpanse
+import cloud.kubelet.foundation.gjallarhorn.util.ColorGradient
+import cloud.kubelet.foundation.gjallarhorn.util.FloatClamp
+import java.awt.Color
+import java.awt.image.BufferedImage
+
+abstract class BlockHeatMapRenderer(quadPixelSize: Int = defaultQuadPixelSize) : BlockGridRenderer(quadPixelSize) {
+  protected fun buildHeatMapImage(expanse: BlockExpanse, clamp: FloatClamp, calculate: (Long, Long) -> Long?): BufferedImage =
+    buildPixelQuadImage(expanse) { x, z ->
+      val value = calculate(x, z)
+      val color = if (value != null) {
+        val floatValue = clamp.convert(value)
+        ColorGradient.HeatMap.getColorAtValue(floatValue)
+      } else {
+        Color.white
+      }
+
+      setPixelQuad(x, z, color.rgb)
+    }
+}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/render/BlockHeightMapRenderer.kt

@@ -0,0 +1,17 @@
+package cloud.kubelet.foundation.gjallarhorn.render
+
+import cloud.kubelet.foundation.gjallarhorn.state.BlockExpanse
+import cloud.kubelet.foundation.gjallarhorn.state.BlockMap
+import cloud.kubelet.foundation.gjallarhorn.util.FloatClamp
+import java.awt.image.BufferedImage
+
+class BlockHeightMapRenderer(val expanse: BlockExpanse, quadPixelSize: Int = defaultQuadPixelSize) :
+  BlockHeatMapRenderer(quadPixelSize) {
+  override fun render(map: BlockMap): BufferedImage {
+    val yMin = map.blocks.minOf { xSection -> xSection.value.minOf { zSection -> zSection.value.minOf { it.key } } }
+    val yMax = map.blocks.maxOf { xSection -> xSection.value.maxOf { zSection -> zSection.value.maxOf { it.key } } }
+    val clamp = FloatClamp(yMin, yMax)
+
+    return buildHeatMapImage(expanse, clamp) { x, z -> map.blocks[x]?.get(z)?.maxOf { it.key } }
+  }
+}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/render/BlockImageRenderer.kt

@@ -0,0 +1,5 @@
+package cloud.kubelet.foundation.gjallarhorn.render
+
+import java.awt.image.BufferedImage
+
+interface BlockImageRenderer : BlockMapRenderer<BufferedImage>

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/render/BlockMapRenderer.kt

@@ -0,0 +1,7 @@
+package cloud.kubelet.foundation.gjallarhorn.render
+
+import cloud.kubelet.foundation.gjallarhorn.state.BlockMap
+
+interface BlockMapRenderer<T> {
+  fun render(map: BlockMap): T
+}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/render/BlockPosition.kt

@@ -1,37 +0,0 @@
-package cloud.kubelet.foundation.gjallarhorn.render
-
-import java.util.*
-
-data class BlockPosition(
-  val x: Long,
-  val y: Long,
-  val z: Long
-) {
-  override fun equals(other: Any?): Boolean {
-    if (other !is BlockPosition) {
-      return false
-    }
-
-    return other.x == x && other.y == y && other.z == z
-  }
-
-  override fun hashCode(): Int = Objects.hash(x, y, z)
-
-  fun applyAsOffset(position: BlockPosition) = position.copy(
-    x = position.x + x,
-    y = position.y + y,
-    z = position.z + z
-  )
-
-  companion object {
-    val zero = BlockPosition(0, 0, 0)
-
-    fun maxOf(positions: Sequence<BlockPosition>): BlockPosition {
-      val x = positions.maxOf { it.x }
-      val y = positions.maxOf { it.y }
-      val z = positions.maxOf { it.z }
-
-      return BlockPosition(x, y, z)
-    }
-  }
-}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/render/BlockStateImage.kt

@@ -1,89 +0,0 @@
-package cloud.kubelet.foundation.gjallarhorn.render
-
-import cloud.kubelet.foundation.gjallarhorn.util.ColorGradient
-import cloud.kubelet.foundation.gjallarhorn.util.FloatClamp
-import cloud.kubelet.foundation.gjallarhorn.util.RandomColorKey
-import java.awt.Color
-import java.awt.Rectangle
-import java.awt.image.BufferedImage
-import java.util.*
-
-class BlockStateImage {
-  private val blocks = TreeMap<Long, TreeMap<Long, TreeMap<Long, BlockState>>>()
-
-  fun put(position: BlockPosition, state: BlockState) {
-    blocks.getOrPut(position.x) {
-      TreeMap()
-    }.getOrPut(position.z) {
-      TreeMap()
-    }[position.y] = state
-  }
-
-  fun buildTopDownImage(expanse: BlockExpanse, randomColorKey: RandomColorKey): BufferedImage {
-    return buildPixelQuadImage(expanse) { x, z ->
-      val maybeYBlocks = blocks[x]?.get(z)
-      if (maybeYBlocks == null) {
-        setPixelQuad(x, z, Color.white.rgb)
-        return@buildPixelQuadImage
-      }
-      val maxBlockState = maybeYBlocks.maxByOrNull { it.key }?.value
-      if (maxBlockState == null) {
-        setPixelQuad(x, z, Color.white.rgb)
-        return@buildPixelQuadImage
-      }
-
-      val color = randomColorKey.map(maxBlockState.type)
-      setPixelQuad(x, z, color.rgb)
-    }
-  }
-
-  fun buildHeightMapImage(expanse: BlockExpanse): BufferedImage {
-    val yMin = blocks.minOf { xSection -> xSection.value.minOf { zSection -> zSection.value.minOf { it.key } } }
-    val yMax = blocks.maxOf { xSection -> xSection.value.maxOf { zSection -> zSection.value.maxOf { it.key } } }
-    val clamp = FloatClamp(yMin, yMax)
-
-    return buildHeatMapImage(expanse, clamp) { x, z -> blocks[x]?.get(z)?.maxOf { it.key } }
-  }
-
-  fun buildHeatMapImage(expanse: BlockExpanse, clamp: FloatClamp, calculate: (Long, Long) -> Long?): BufferedImage =
-    buildPixelQuadImage(expanse) { x, z ->
-      val value = calculate(x, z)
-      val color = if (value != null) {
-        val floatValue = clamp.convert(value)
-        ColorGradient.HeatMap.getColorAtValue(floatValue)
-      } else {
-        Color.white
-      }
-
-      setPixelQuad(x, z, color.rgb)
-    }
-
-  private fun BufferedImage.setPixelQuad(x: Long, z: Long, rgb: Int) {
-    drawSquare(x * quadImageSize, z * quadImageSize, quadImageSize.toLong(), rgb)
-  }
-
-  private fun BufferedImage.drawSquare(x: Long, y: Long, side: Long, rgb: Int) {
-    val graphics = createGraphics()
-    graphics.color = Color(rgb)
-    graphics.fill(Rectangle(x.toInt(), y.toInt(), side.toInt(), side.toInt()))
-    graphics.dispose()
-  }
-
-  private fun buildPixelQuadImage(expanse: BlockExpanse, callback: BufferedImage.(Long, Long) -> Unit): BufferedImage {
-    val width = expanse.size.x
-    val height = expanse.size.z
-    val bufferedImage =
-      BufferedImage(width.toInt() * quadImageSize, height.toInt() * quadImageSize, BufferedImage.TYPE_4BYTE_ABGR)
-
-    for (x in 0 until width) {
-      for (z in 0 until height) {
-        callback(bufferedImage, x, z)
-      }
-    }
-    return bufferedImage
-  }
-
-  companion object {
-    const val quadImageSize = 4
-  }
-}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/state/BlockCoordinate.kt

@@ -0,0 +1,37 @@
+package cloud.kubelet.foundation.gjallarhorn.state
+
+import java.util.*
+
+data class BlockCoordinate(
+  val x: Long,
+  val y: Long,
+  val z: Long
+) {
+  override fun equals(other: Any?): Boolean {
+    if (other !is BlockCoordinate) {
+      return false
+    }
+
+    return other.x == x && other.y == y && other.z == z
+  }
+
+  override fun hashCode(): Int = Objects.hash(x, y, z)
+
+  fun applyAsOffset(coordinate: BlockCoordinate) = coordinate.copy(
+    x = coordinate.x + x,
+    y = coordinate.y + y,
+    z = coordinate.z + z
+  )
+
+  companion object {
+    val zero = BlockCoordinate(0, 0, 0)
+
+    fun maxOf(coordinates: Sequence<BlockCoordinate>): BlockCoordinate {
+      val x = coordinates.maxOf { it.x }
+      val y = coordinates.maxOf { it.y }
+      val z = coordinates.maxOf { it.z }
+
+      return BlockCoordinate(x, y, z)
+    }
+  }
+}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/state/BlockExpanse.kt

@@ -0,0 +1,13 @@
+package cloud.kubelet.foundation.gjallarhorn.state
+
+class BlockExpanse(
+  val offset: BlockCoordinate,
+  val size: BlockCoordinate
+) {
+  companion object {
+    fun offsetAndMax(offset: BlockCoordinate, max: BlockCoordinate) = BlockExpanse(
+      offset,
+      offset.applyAsOffset(max)
+    )
+  }
+}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/state/BlockLogTracker.kt

@@ -1,15 +1,15 @@
-package cloud.kubelet.foundation.gjallarhorn.render
+package cloud.kubelet.foundation.gjallarhorn.state
 
 import kotlin.math.absoluteValue
 
-class BlockStateTracker(private val mode: BlockTrackMode = BlockTrackMode.RemoveOnDelete) {
-  val blocks = HashMap<BlockPosition, BlockState>()
+class BlockLogTracker(private val mode: BlockTrackMode = BlockTrackMode.RemoveOnDelete) {
+  val blocks = HashMap<BlockCoordinate, BlockState>()
 
-  fun place(position: BlockPosition, state: BlockState) {
+  fun place(position: BlockCoordinate, state: BlockState) {
     blocks[position] = state
   }
 
-  fun delete(position: BlockPosition) {
+  fun delete(position: BlockCoordinate) {
     if (mode == BlockTrackMode.AirOnDelete) {
       blocks[position] = BlockState("minecraft:air")
     } else {
@@ -17,7 +17,7 @@ class BlockStateTracker(private val mode: BlockTrackMode = BlockTrackMode.Remove
     }
   }
 
-  fun trimOutsideXAndZRange(min: BlockPosition, max: BlockPosition) {
+  fun trimOutsideXAndZRange(min: BlockCoordinate, max: BlockCoordinate) {
     val blockPositionsToRemove = blocks.keys.filter {
       it.x < min.x ||
           it.z < min.z ||
@@ -28,7 +28,7 @@ class BlockStateTracker(private val mode: BlockTrackMode = BlockTrackMode.Remove
     blockPositionsToRemove.forEach { blocks.remove(it) }
   }
 
-  fun calculateZeroBlockOffset(): BlockPosition {
+  fun calculateZeroBlockOffset(): BlockCoordinate {
     val x = blocks.keys.minOf { it.x }
     val y = blocks.keys.minOf { it.y }
     val z = blocks.keys.minOf { it.z }
@@ -37,22 +37,24 @@ class BlockStateTracker(private val mode: BlockTrackMode = BlockTrackMode.Remove
     val yOffset = if (y < 0) y.absoluteValue else 0
     val zOffset = if (z < 0) z.absoluteValue else 0
 
-    return BlockPosition(xOffset, yOffset, zOffset)
+    return BlockCoordinate(xOffset, yOffset, zOffset)
   }
 
-  fun calculateMaxBlock(): BlockPosition {
+  fun calculateMaxBlock(): BlockCoordinate {
     val x = blocks.keys.maxOf { it.x }
     val y = blocks.keys.maxOf { it.y }
     val z = blocks.keys.maxOf { it.z }
-    return BlockPosition(x, y, z)
+    return BlockCoordinate(x, y, z)
   }
 
   fun isEmpty() = blocks.isEmpty()
 
-  fun populateStateImage(image: BlockStateImage, offset: BlockPosition = BlockPosition.zero) {
+  fun buildBlockMap(offset: BlockCoordinate = BlockCoordinate.zero): BlockMap {
+    val map = BlockMap()
     blocks.forEach { (position, state) ->
       val realPosition = offset.applyAsOffset(position)
-      image.put(realPosition, state)
+      map.put(realPosition, state)
     }
+    return map
   }
 }

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/state/BlockMap.kt

@@ -0,0 +1,15 @@
+package cloud.kubelet.foundation.gjallarhorn.state
+
+import java.util.*
+
+class BlockMap {
+  val blocks = TreeMap<Long, TreeMap<Long, TreeMap<Long, BlockState>>>()
+
+  fun put(position: BlockCoordinate, state: BlockState) {
+    blocks.getOrPut(position.x) {
+      TreeMap()
+    }.getOrPut(position.z) {
+      TreeMap()
+    }[position.y] = state
+  }
+}

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/state/BlockState.kt

@@ -1,4 +1,4 @@
-package cloud.kubelet.foundation.gjallarhorn.render
+package cloud.kubelet.foundation.gjallarhorn.state
 
 import kotlinx.serialization.Serializable
 

tool-gjallarhorn/src/main/kotlin/cloud/kubelet/foundation/gjallarhorn/state/BlockTrackMode.kt

@@ -1,4 +1,4 @@
-package cloud.kubelet.foundation.gjallarhorn.render
+package cloud.kubelet.foundation.gjallarhorn.state
 
 enum class BlockTrackMode {
   RemoveOnDelete,