decodeTiles 解码图块

decodeTiles

类型: MethodDeclaration

定义位置: codec.ts

描述

解码图块

参数 code: 图块数据编码

参数 width: 瓦片地图宽度

参数 height: 瓦片地图高度

返回值:图块数组

参数

参数名	类型	描述	默认值
code	string	-	-
width	number	-	-
height	number	-	-

返回值

类型: Uint32Array

图块数组

源代码

位置: 第 71 行

public decodeTiles(code: string, width: number, height: number): Uint32Array {
    const {decodeClone} = this
    const BYTES = this.textEncoder.encode(code)
    const BYTES_LENGTH = BYTES.length
    const TILES = new Uint32Array(width * height)
    const TILES_LENGTH = TILES.length
    let Bi = 0
    let Ti = 0
    while (Bi < BYTES_LENGTH) {
      const CODE = BYTES[Bi]
      if (CODE <= 98) {
        TILES[Ti] =
          (BYTES[Bi    ] - 35 << 26)
        + (BYTES[Bi + 1] - 35 << 20)
        + (BYTES[Bi + 2] - 35 << 14)
        + (BYTES[Bi + 3] - 35 << 8)
        + (BYTES[Bi + 4] - 35)
        Ti += 1
        Bi += 5
      } else if (CODE <= 109) {
        if (CODE !== 109) {
          const COPY = TILES[Ti - 1]
          const END = Ti + CODE - 98
          while (Ti < END) {
            TILES[Ti++] = COPY
          }
          Bi += 1
        } else {
          const {index, count} = decodeClone(BYTES, ++Bi)
          const COPY = TILES[Ti - 1]
          const END = Ti + count
          while (Ti < END) {
            TILES[Ti++] = COPY
          }
          Bi = index
        }
      } else {
        if (CODE !== 126) {
          Ti += CODE - 109
          Bi += 1
        } else {
          const {index, count} = decodeClone(BYTES, ++Bi)
          Ti += count
          Bi = index
        }
      }
    }
    if (Bi !== BYTES_LENGTH || Ti !== TILES_LENGTH) {
      throw new RangeError(`
      Failed to decode tiles.
      Processed bytes: ${Bi} / ${BYTES_LENGTH}
      Restored data: ${Ti} / ${TILES_LENGTH}
      `)
    }
    return TILES
  }

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文档生成时间：2025/7/7 12:07:06