223 lines
10 KiB
JavaScript
223 lines
10 KiB
JavaScript
var __assign = (this && this.__assign) || function () {
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__assign = Object.assign || function(t) {
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for (var s, i = 1, n = arguments.length; i < n; i++) {
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s = arguments[i];
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for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
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t[p] = s[p];
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}
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return t;
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};
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return __assign.apply(this, arguments);
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};
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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return new (P || (P = Promise))(function (resolve, reject) {
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
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function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
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step((generator = generator.apply(thisArg, _arguments || [])).next());
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});
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};
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var __generator = (this && this.__generator) || function (thisArg, body) {
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var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
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return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
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function verb(n) { return function (v) { return step([n, v]); }; }
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function step(op) {
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if (f) throw new TypeError("Generator is already executing.");
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while (_) try {
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if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
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if (y = 0, t) op = [op[0] & 2, t.value];
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switch (op[0]) {
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case 0: case 1: t = op; break;
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case 4: _.label++; return { value: op[1], done: false };
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case 5: _.label++; y = op[1]; op = [0]; continue;
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case 7: op = _.ops.pop(); _.trys.pop(); continue;
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default:
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if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
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if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
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if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
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if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
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if (t[2]) _.ops.pop();
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_.trys.pop(); continue;
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}
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op = body.call(thisArg, _);
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} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
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if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
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}
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};
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import { QiniuErrorName, QiniuError } from '../errors';
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import { createObjectURL } from './helper';
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var mimeTypes = {
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PNG: 'image/png',
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JPEG: 'image/jpeg',
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WEBP: 'image/webp',
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BMP: 'image/bmp'
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};
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var maxSteps = 4;
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var scaleFactor = Math.log(2);
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var supportMimeTypes = Object.keys(mimeTypes).map(function (type) { return mimeTypes[type]; });
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var defaultType = mimeTypes.JPEG;
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function isSupportedType(type) {
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return supportMimeTypes.includes(type);
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}
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var Compress = /** @class */ (function () {
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function Compress(file, config) {
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this.file = file;
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this.config = config;
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this.config = __assign({ quality: 0.92, noCompressIfLarger: false }, this.config);
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}
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Compress.prototype.process = function () {
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return __awaiter(this, void 0, void 0, function () {
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var srcDimension, originImage, canvas, scale, scaleCanvas, distBlob;
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return __generator(this, function (_a) {
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switch (_a.label) {
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case 0:
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this.outputType = this.file.type;
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srcDimension = {};
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if (!isSupportedType(this.file.type)) {
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throw new QiniuError(QiniuErrorName.UnsupportedFileType, "unsupported file type: " + this.file.type);
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}
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return [4 /*yield*/, this.getOriginImage()];
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case 1:
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originImage = _a.sent();
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return [4 /*yield*/, this.getCanvas(originImage)];
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case 2:
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canvas = _a.sent();
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scale = 1;
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if (this.config.maxWidth) {
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scale = Math.min(1, this.config.maxWidth / canvas.width);
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}
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if (this.config.maxHeight) {
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scale = Math.min(1, scale, this.config.maxHeight / canvas.height);
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}
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srcDimension.width = canvas.width;
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srcDimension.height = canvas.height;
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return [4 /*yield*/, this.doScale(canvas, scale)];
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case 3:
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scaleCanvas = _a.sent();
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distBlob = this.toBlob(scaleCanvas);
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if (distBlob.size > this.file.size && this.config.noCompressIfLarger) {
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return [2 /*return*/, {
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dist: this.file,
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width: srcDimension.width,
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height: srcDimension.height
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}];
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}
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return [2 /*return*/, {
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dist: distBlob,
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width: scaleCanvas.width,
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height: scaleCanvas.height
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}];
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}
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});
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});
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};
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Compress.prototype.clear = function (ctx, width, height) {
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// jpeg 没有 alpha 通道，透明区间会被填充成黑色，这里把透明区间填充为白色
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if (this.outputType === defaultType) {
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ctx.fillStyle = '#fff';
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ctx.fillRect(0, 0, width, height);
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}
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else {
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ctx.clearRect(0, 0, width, height);
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}
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};
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/** 通过 file 初始化 image 对象 */
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Compress.prototype.getOriginImage = function () {
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var _this = this;
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return new Promise(function (resolve, reject) {
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var url = createObjectURL(_this.file);
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var img = new Image();
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img.onload = function () {
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resolve(img);
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};
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img.onerror = function () {
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reject('image load error');
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};
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img.src = url;
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});
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};
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Compress.prototype.getCanvas = function (img) {
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var _this = this;
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return new Promise(function (resolve, reject) {
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var canvas = document.createElement('canvas');
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var context = canvas.getContext('2d');
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if (!context) {
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reject(new QiniuError(QiniuErrorName.GetCanvasContextFailed, 'context is null'));
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return;
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}
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var width = img.width, height = img.height;
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canvas.height = height;
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canvas.width = width;
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_this.clear(context, width, height);
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context.drawImage(img, 0, 0);
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resolve(canvas);
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});
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};
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Compress.prototype.doScale = function (source, scale) {
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return __awaiter(this, void 0, void 0, function () {
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var sctx, steps, factor, mirror, mctx, width, height, originWidth, originHeight, src, context, i, dw, dh, canvas, data;
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return __generator(this, function (_a) {
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if (scale === 1) {
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return [2 /*return*/, source];
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}
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sctx = source.getContext('2d');
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steps = Math.min(maxSteps, Math.ceil((1 / scale) / scaleFactor));
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factor = Math.pow(scale, (1 / steps));
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mirror = document.createElement('canvas');
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mctx = mirror.getContext('2d');
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width = source.width, height = source.height;
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originWidth = width;
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originHeight = height;
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mirror.width = width;
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mirror.height = height;
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if (!mctx || !sctx) {
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throw new QiniuError(QiniuErrorName.GetCanvasContextFailed, "mctx or sctx can't be null");
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}
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for (i = 0; i < steps; i++) {
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dw = width * factor | 0 // eslint-disable-line no-bitwise
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;
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dh = height * factor | 0 // eslint-disable-line no-bitwise
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;
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// 到最后一步的时候 dw, dh 用目标缩放尺寸，否则会出现最后尺寸偏小的情况
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if (i === steps - 1) {
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dw = originWidth * scale;
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dh = originHeight * scale;
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}
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if (i % 2 === 0) {
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src = source;
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context = mctx;
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}
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else {
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src = mirror;
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context = sctx;
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}
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// 每次画前都清空，避免图像重叠
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this.clear(context, width, height);
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context.drawImage(src, 0, 0, width, height, 0, 0, dw, dh);
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width = dw;
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height = dh;
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}
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canvas = src === source ? mirror : source;
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data = context.getImageData(0, 0, width, height);
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// resize
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canvas.width = width;
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canvas.height = height;
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// store image data
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context.putImageData(data, 0, 0);
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return [2 /*return*/, canvas];
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});
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});
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};
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/** 这里把 base64 字符串转为 blob 对象 */
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Compress.prototype.toBlob = function (result) {
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var dataURL = result.toDataURL(this.outputType, this.config.quality);
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var buffer = atob(dataURL.split(',')[1]).split('').map(function (char) { return char.charCodeAt(0); });
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var blob = new Blob([new Uint8Array(buffer)], { type: this.outputType });
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return blob;
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};
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return Compress;
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}());
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var compressImage = function (file, options) { return new Compress(file, options).process(); };
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export default compressImage;
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//# sourceMappingURL=compress.js.map
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