Adolfo Reyna
51 lines
2.2 KiB
JavaScript
51 lines
2.2 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.renderPartitions = void 0;
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const renderPartitions = ({ frames, concurrency, }) => {
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const partitions = [];
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let start = 0;
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for (let i = 0; i < concurrency; i++) {
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const end = start + Math.ceil((frames.length - start) / (concurrency - i));
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partitions.push(frames.slice(start, end));
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start = end;
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}
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return {
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partitions,
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getNextFrame: (pageIndex) => {
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if (partitions[pageIndex].length === 0) {
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const partitionLengths = partitions.map((p) => p.length);
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if (partitionLengths.every((p) => p === 0)) {
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throw new Error('No more frames to render');
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}
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let longestRemainingPartitionIndex = -1;
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for (let i = 0; i < partitions.length; i++) {
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if (longestRemainingPartitionIndex === -1) {
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longestRemainingPartitionIndex = i;
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continue;
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}
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if (partitions[i].length >
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partitions[longestRemainingPartitionIndex].length) {
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longestRemainingPartitionIndex = i;
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}
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}
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if (longestRemainingPartitionIndex === -1) {
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throw new Error('No more frames to render');
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}
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// Round up - let's say only one frame is left to render, we should take this one
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const slicePoint = Math.ceil(partitions[longestRemainingPartitionIndex].length / 2) -
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// but don't forget it's zero indexed :)
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1;
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partitions[pageIndex] =
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partitions[longestRemainingPartitionIndex].slice(slicePoint);
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partitions[longestRemainingPartitionIndex] = partitions[longestRemainingPartitionIndex].slice(0, slicePoint);
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}
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const value = partitions[pageIndex].shift();
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if (value === undefined) {
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throw new Error('No more frames to render');
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}
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return value;
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},
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};
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};
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exports.renderPartitions = renderPartitions;
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