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1 : bitsPerSample.length;\n\n  for (let i = 0; i < height; ++i) {\n    // Last strip will be truncated if height % stripHeight != 0\n    if (i * stride * width * bytesPerSample >= block.byteLength) {\n      break;\n    }\n    let row;\n    if (predictor === 2) { // horizontal prediction\n      switch (bitsPerSample[0]) {\n        case 8:\n          row = new Uint8Array(\n            block, i * stride * width * bytesPerSample, stride * width * bytesPerSample,\n          );\n          break;\n        case 16:\n          row = new Uint16Array(\n            block, i * stride * width * bytesPerSample, stride * width * bytesPerSample / 2,\n          );\n          break;\n        case 32:\n          row = new Uint32Array(\n            block, i * stride * width * bytesPerSample, stride * width * bytesPerSample / 4,\n          );\n          break;\n        default:\n          throw new Error(`Predictor 2 not allowed with ${bitsPerSample[0]} bits per sample.`);\n      }\n      decodeRowAcc(row, stride, bytesPerSample);\n    } else if (predictor === 3) { // horizontal floating point\n      row = new Uint8Array(\n        block, i * stride * width * bytesPerSample, stride * width * bytesPerSample,\n      );\n      decodeRowFloatingPoint(row, stride, bytesPerSample);\n    }\n  }\n  return block;\n}\n","import { applyPredictor } from '../predictor.js';\n\nexport default class BaseDecoder {\n  async decode(fileDirectory, buffer) {\n    const decoded = await this.decodeBlock(buffer);\n    const predictor = fileDirectory.Predictor || 1;\n    if (predictor !== 1) {\n      const isTiled = !fileDirectory.StripOffsets;\n      const tileWidth = isTiled ? fileDirectory.TileWidth : fileDirectory.ImageWidth;\n      const tileHeight = isTiled ? fileDirectory.TileLength : (\n        fileDirectory.RowsPerStrip || fileDirectory.ImageLength\n      );\n      return applyPredictor(\n        decoded, predictor, tileWidth, tileHeight, fileDirectory.BitsPerSample,\n        fileDirectory.PlanarConfiguration,\n      );\n    }\n    return decoded;\n  }\n}\n","import BaseDecoder from './basedecoder.js';\n\n/**\n * class WebImageDecoder\n *\n * This decoder uses the browsers image decoding facilities to read image\n * formats like WebP when supported.\n */\nexport default class WebImageDecoder extends BaseDecoder {\n  constructor() {\n    super();\n    if (typeof createImageBitmap === 'undefined') {\n      throw new Error('Cannot decode WebImage as `createImageBitmap` is not available');\n    } else if (typeof document === 'undefined' && typeof OffscreenCanvas === 'undefined') {\n      throw new Error('Cannot decode WebImage as neither `document` nor `OffscreenCanvas` is not available');\n    }\n  }\n\n  async decode(fileDirectory, buffer) {\n    const blob = new Blob([buffer]);\n    const imageBitmap = await createImageBitmap(blob);\n\n    let canvas;\n    if (typeof document !== 'undefined') {\n      canvas = document.createElement('canvas');\n      canvas.width = imageBitmap.width;\n      canvas.height = imageBitmap.height;\n    } else {\n      canvas = new OffscreenCanvas(imageBitmap.width, imageBitmap.height);\n    }\n\n    const ctx = canvas.getContext('2d');\n    ctx.drawImage(imageBitmap, 0, 0);\n\n    // TODO: check how many samples per pixel we have, and return RGB/RGBA accordingly\n    // it seems like GDAL always encodes via RGBA which does not require a translation\n\n    return ctx.getImageData(0, 0, imageBitmap.width, imageBitmap.height).data.buffer;\n  }\n}\n"],"names":["decodeRowAcc","row","stride","length","offset","i","decodeRowFloatingPoint","bytesPerSample","index","count","wc","copy","slice","b","applyPredictor","block","predictor","width","height","bitsPerSample","planarConfiguration","Error","byteLength","Uint8Array","Uint16Array","Uint32Array","BaseDecoder","fileDirectory","buffer","this","decodeBlock","decoded","Predictor","isTiled","StripOffsets","tileWidth","TileWidth","ImageWidth","tileHeight","TileLength","RowsPerStrip","ImageLength","BitsPerSample","PlanarConfiguration","WebImageDecoder","createImageBitmap","document","OffscreenCanvas","blob","Blob","imageBitmap","canvas","createElement","ctx","getContext","drawImage","getImageData","data"],"sourceRoot":""}