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22 | "use strict";
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23 |
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24 | Object.defineProperty(exports, "__esModule", {
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25 | value: true
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26 | });
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27 | exports.applyMaskImageData = applyMaskImageData;
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28 |
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29 | var _util = require("./util.js");
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30 |
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31 | function applyMaskImageData({
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32 | src,
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33 | srcPos = 0,
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34 | dest,
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35 | destPos = 0,
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36 | width,
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37 | height,
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38 | inverseDecode = false
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39 | }) {
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40 | const opaque = _util.FeatureTest.isLittleEndian ? 0xff000000 : 0x000000ff;
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41 | const [zeroMapping, oneMapping] = !inverseDecode ? [opaque, 0] : [0, opaque];
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42 | const widthInSource = width >> 3;
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43 | const widthRemainder = width & 7;
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44 | const srcLength = src.length;
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45 | dest = new Uint32Array(dest.buffer);
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46 |
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47 | for (let i = 0; i < height; i++) {
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48 | for (const max = srcPos + widthInSource; srcPos < max; srcPos++) {
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49 | const elem = srcPos < srcLength ? src[srcPos] : 255;
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50 | dest[destPos++] = elem & 0b10000000 ? oneMapping : zeroMapping;
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51 | dest[destPos++] = elem & 0b1000000 ? oneMapping : zeroMapping;
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52 | dest[destPos++] = elem & 0b100000 ? oneMapping : zeroMapping;
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53 | dest[destPos++] = elem & 0b10000 ? oneMapping : zeroMapping;
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54 | dest[destPos++] = elem & 0b1000 ? oneMapping : zeroMapping;
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55 | dest[destPos++] = elem & 0b100 ? oneMapping : zeroMapping;
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56 | dest[destPos++] = elem & 0b10 ? oneMapping : zeroMapping;
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57 | dest[destPos++] = elem & 0b1 ? oneMapping : zeroMapping;
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58 | }
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59 |
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60 | if (widthRemainder === 0) {
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61 | continue;
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62 | }
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63 |
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64 | const elem = srcPos < srcLength ? src[srcPos++] : 255;
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65 |
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66 | for (let j = 0; j < widthRemainder; j++) {
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67 | dest[destPos++] = elem & 1 << 7 - j ? oneMapping : zeroMapping;
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68 | }
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69 | }
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70 |
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71 | return {
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72 | srcPos,
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73 | destPos
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74 | };
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75 | } |
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