encodeTiles 编码图块

encodeTiles

类型: MethodDeclaration

定义位置: codec.ts

描述

编码图块

参数 tiles: 图块数组

返回值:图块数据编码

参数

参数名	类型	描述	默认值
tiles	Uint32Array	-	-

返回值

类型: string

图块数据编码

源代码

位置: 第 14 行

public encodeTiles(tiles: Uint32Array): string {
    const {encodeClone} = this
    const TILES = tiles
    const TILES_LENGTH = TILES.length
    const BYTES = GL.arrays[0].uint8
    let Bi = 0
    let Ti = 0
    while (Ti < TILES_LENGTH) {
      if (TILES[Ti] === 0) {
        let blankCount = 1
        Ti += 1
        while (TILES[Ti] === 0) {
          blankCount++
          Ti++
        }
        if (blankCount <= 16) {
          BYTES[Bi++] = blankCount + 109
        } else {
          BYTES[Bi++] = 126
          Bi = encodeClone(BYTES, Bi, blankCount)
        }
      } else if (TILES[Ti] === TILES[Ti - 1]) {
        let cloneCount = 1
        Ti += 1
        while (TILES[Ti] === TILES[Ti - 1]) {
          cloneCount++
          Ti++
        }
        if (cloneCount <= 10) {
          BYTES[Bi++] = cloneCount + 98
        } else {
          BYTES[Bi++] = 109
          Bi = encodeClone(BYTES, Bi, cloneCount)
        }
      } else {
        const TILE = TILES[Ti]
        BYTES[Bi    ] = (TILE >> 26           ) + 35
        BYTES[Bi + 1] = (TILE >> 20 & 0b111111) + 35
        BYTES[Bi + 2] = (TILE >> 14 & 0b111111) + 35
        BYTES[Bi + 3] = (TILE >> 8  & 0b111111) + 35
        BYTES[Bi + 4] = (TILE       & 0b111111) + 35
        Bi += 5
        Ti += 1
      }
    }
    return this.textDecoder.decode(
      new Uint8Array(BYTES.buffer, 0, Bi)
    )
  }

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文档生成时间：2025/7/7 12:07:06