ry-vue-map/lib/ryui.common.6.js

ry公共组件库

((typeof self !== 'undefined' ? self : this)["webpackJsonpryui"] = (typeof self !== 'undefined' ? self : this)["webpackJsonpryui"] || []).push([[6],{

/***/ "b3f7":
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";

// EXPORTS
__webpack_require__.d(__webpack_exports__, "a", function() { return /* binding */ basedecoder_BaseDecoder; });

// CONCATENATED MODULE: ./node_modules/geotiff/dist-module/predictor.js
function decodeRowAcc(row, stride) {
  let length = row.length - stride;
  let offset = 0;
  do {
    for (let i = stride; i > 0; i--) {
      row[offset + stride] += row[offset];
      offset++;
    }

    length -= stride;
  } while (length > 0);
}

function decodeRowFloatingPoint(row, stride, bytesPerSample) {
  let index = 0;
  let count = row.length;
  const wc = count / bytesPerSample;

  while (count > stride) {
    for (let i = stride; i > 0; --i) {
      row[index + stride] += row[index];
      ++index;
    }
    count -= stride;
  }

  const copy = row.slice();
  for (let i = 0; i < wc; ++i) {
    for (let b = 0; b < bytesPerSample; ++b) {
      row[(bytesPerSample * i) + b] = copy[((bytesPerSample - b - 1) * wc) + i];
    }
  }
}

function applyPredictor(block, predictor, width, height, bitsPerSample,
  planarConfiguration) {
  if (!predictor || predictor === 1) {
    return block;
  }

  for (let i = 0; i < bitsPerSample.length; ++i) {
    if (bitsPerSample[i] % 8 !== 0) {
      throw new Error('When decoding with predictor, only multiple of 8 bits are supported.');
    }
    if (bitsPerSample[i] !== bitsPerSample[0]) {
      throw new Error('When decoding with predictor, all samples must have the same size.');
    }
  }

  const bytesPerSample = bitsPerSample[0] / 8;
  const stride = planarConfiguration === 2 ? 1 : bitsPerSample.length;

  for (let i = 0; i < height; ++i) {
    // Last strip will be truncated if height % stripHeight != 0
    if (i * stride * width * bytesPerSample >= block.byteLength) {
      break;
    }
    let row;
    if (predictor === 2) { // horizontal prediction
      switch (bitsPerSample[0]) {
        case 8:
          row = new Uint8Array(
            block, i * stride * width * bytesPerSample, stride * width * bytesPerSample,
          );
          break;
        case 16:
          row = new Uint16Array(
            block, i * stride * width * bytesPerSample, stride * width * bytesPerSample / 2,
          );
          break;
        case 32:
          row = new Uint32Array(
            block, i * stride * width * bytesPerSample, stride * width * bytesPerSample / 4,
          );
          break;
        default:
          throw new Error(`Predictor 2 not allowed with ${bitsPerSample[0]} bits per sample.`);
      }
      decodeRowAcc(row, stride, bytesPerSample);
    } else if (predictor === 3) { // horizontal floating point
      row = new Uint8Array(
        block, i * stride * width * bytesPerSample, stride * width * bytesPerSample,
      );
      decodeRowFloatingPoint(row, stride, bytesPerSample);
    }
  }
  return block;
}

// CONCATENATED MODULE: ./node_modules/geotiff/dist-module/compression/basedecoder.js


class basedecoder_BaseDecoder {
  async decode(fileDirectory, buffer) {
    const decoded = await this.decodeBlock(buffer);
    const predictor = fileDirectory.Predictor || 1;
    if (predictor !== 1) {
      const isTiled = !fileDirectory.StripOffsets;
      const tileWidth = isTiled ? fileDirectory.TileWidth : fileDirectory.ImageWidth;
      const tileHeight = isTiled ? fileDirectory.TileLength : (
        fileDirectory.RowsPerStrip || fileDirectory.ImageLength
      );
      return applyPredictor(
        decoded, predictor, tileWidth, tileHeight, fileDirectory.BitsPerSample,
        fileDirectory.PlanarConfiguration,
      );
    }
    return decoded;
  }
}


/***/ }),

/***/ "ee5b":
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "default", function() { return WebImageDecoder; });
/* harmony import */ var _basedecoder_js__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__("b3f7");


/**
 * class WebImageDecoder
 *
 * This decoder uses the browsers image decoding facilities to read image
 * formats like WebP when supported.
 */
class WebImageDecoder extends _basedecoder_js__WEBPACK_IMPORTED_MODULE_0__[/* default */ "a"] {
  constructor() {
    super();
    if (typeof createImageBitmap === 'undefined') {
      throw new Error('Cannot decode WebImage as `createImageBitmap` is not available');
    } else if (typeof document === 'undefined' && typeof OffscreenCanvas === 'undefined') {
      throw new Error('Cannot decode WebImage as neither `document` nor `OffscreenCanvas` is not available');
    }
  }

  async decode(fileDirectory, buffer) {
    const blob = new Blob([buffer]);
    const imageBitmap = await createImageBitmap(blob);

    let canvas;
    if (typeof document !== 'undefined') {
      canvas = document.createElement('canvas');
      canvas.width = imageBitmap.width;
      canvas.height = imageBitmap.height;
    } else {
      canvas = new OffscreenCanvas(imageBitmap.width, imageBitmap.height);
    }

    const ctx = canvas.getContext('2d');
    ctx.drawImage(imageBitmap, 0, 0);

    // TODO: check how many samples per pixel we have, and return RGB/RGBA accordingly
    // it seems like GDAL always encodes via RGBA which does not require a translation

    return ctx.getImageData(0, 0, imageBitmap.width, imageBitmap.height).data.buffer;
  }
}


/***/ })

}]);