21 lines
724 B
JavaScript
21 lines
724 B
JavaScript
import { applyPredictor } from '../predictor.js';
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export default class BaseDecoder {
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async decode(fileDirectory, buffer) {
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const decoded = await this.decodeBlock(buffer);
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const predictor = fileDirectory.Predictor || 1;
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if (predictor !== 1) {
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const isTiled = !fileDirectory.StripOffsets;
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const tileWidth = isTiled ? fileDirectory.TileWidth : fileDirectory.ImageWidth;
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const tileHeight = isTiled ? fileDirectory.TileLength : (
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fileDirectory.RowsPerStrip || fileDirectory.ImageLength
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);
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return applyPredictor(
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decoded, predictor, tileWidth, tileHeight, fileDirectory.BitsPerSample,
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fileDirectory.PlanarConfiguration,
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);
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}
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return decoded;
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}
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}
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