37 lines
6.7 KiB
JavaScript
37 lines
6.7 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.copyImagePart = exports.generateScreenshotMark = void 0;
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const pngjs_1 = require("pngjs");
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const lodash_1 = require("lodash");
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const nanoid_1 = require("nanoid");
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const constants_1 = require("./constants");
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const ALPHABET = '01';
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function generateScreenshotMark() {
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// NOTE: 32-bit id
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const id = (0, nanoid_1.customAlphabet)(ALPHABET, constants_1.MARK_LENGTH)();
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// NOTE: array of RGB values
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const markSeed = (0, lodash_1.flatten)((0, lodash_1.map)(id, bit => bit === '0' ? [0, 0, 0, 255] : [255, 255, 255, 255]));
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// NOTE: macOS browsers can't display an element, if it's CSS height is lesser than 1.
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// It happens on Retina displays, because they have more than 1 physical pixel in a CSS pixel.
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// So increase mark size by prepending transparent pixels before the actual mark.
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const imageData = (0, lodash_1.times)(constants_1.MARK_BYTES_PER_PIXEL * constants_1.MARK_LENGTH * (constants_1.MARK_HEIGHT - 1), (0, lodash_1.constant)(0)).concat(markSeed);
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const imageDataBuffer = Buffer.from(imageData);
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const pngImage = new pngjs_1.PNG({ width: constants_1.MARK_LENGTH, height: constants_1.MARK_HEIGHT });
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imageDataBuffer.copy(pngImage.data);
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const markData = 'data:image/png;base64,' + pngjs_1.PNG.sync.write(pngImage).toString('base64');
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return { markSeed, markData };
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}
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exports.generateScreenshotMark = generateScreenshotMark;
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function copyImagePart(pngImage, { clipLeft, clipTop, clipRight, clipBottom }) {
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const width = clipRight - clipLeft;
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const height = clipBottom - clipTop;
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const dstImage = new pngjs_1.PNG({ width, height });
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const stride = dstImage.width * constants_1.MARK_BYTES_PER_PIXEL;
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for (let i = 0; i < height; i++) {
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const srcStartIndex = (pngImage.width * (i + clipTop) + clipLeft) * constants_1.MARK_BYTES_PER_PIXEL;
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pngImage.data.copy(dstImage.data, stride * i, srcStartIndex, srcStartIndex + stride);
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}
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return dstImage;
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}
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exports.copyImagePart = copyImagePart;
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