@taro-hooks/compressorjs
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JavaScript image compressor.
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JavaScript
/*!
* Compressor.js v2.2.0
* https://fengyuanchen.github.io/compressorjs
*
* Copyright 2018-present Chen Fengyuan
* Released under the MIT license
*
* Date: 2025-04-06T12:41:00.917Z
*/
;
function _extends() {
_extends = Object.assign ? Object.assign.bind() : function (target) {
for (var i = 1; i < arguments.length; i++) {
var source = arguments[i];
for (var key in source) {
if (Object.prototype.hasOwnProperty.call(source, key)) {
target[key] = source[key];
}
}
}
return target;
};
return _extends.apply(this, arguments);
}
var canvasToBlob = {exports: {}};
/*
* JavaScript Canvas to Blob
* https://github.com/blueimp/JavaScript-Canvas-to-Blob
*
* Copyright 2012, Sebastian Tschan
* https://blueimp.net
*
* Licensed under the MIT license:
* https://opensource.org/licenses/MIT
*
* Based on stackoverflow user Stoive's code snippet:
* http://stackoverflow.com/q/4998908
*/
(function (module) {
if (typeof window === 'undefined') {
return;
}
if (typeof window === 'undefined') {
return;
}
(function (window) {
var CanvasPrototype = window.HTMLCanvasElement && window.HTMLCanvasElement.prototype;
var hasCanvasPrototype = !!CanvasPrototype;
var hasBlobConstructor = window.Blob && function () {
try {
return Boolean(new Blob());
} catch (e) {
return false;
}
}();
var hasArrayBufferViewSupport = hasBlobConstructor && window.Uint8Array && function () {
try {
return new Blob([new Uint8Array(100)]).size === 100;
} catch (e) {
return false;
}
}();
var BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder;
var dataURIPattern = /^data:((.*?)(;charset=.*?)?)(;base64)?,/;
var dataURLtoBlob = (hasBlobConstructor || BlobBuilder) && window.atob && window.ArrayBuffer && window.Uint8Array && function (dataURI) {
var matches, mediaType, isBase64, dataString, byteString, arrayBuffer, intArray, i, bb;
// Parse the dataURI components as per RFC 2397
matches = dataURI.match(dataURIPattern);
if (!matches) {
throw new Error('invalid data URI');
}
// Default to text/plain;charset=US-ASCII
mediaType = matches[2] ? matches[1] : 'text/plain' + (matches[3] || ';charset=US-ASCII');
isBase64 = !!matches[4];
dataString = dataURI.slice(matches[0].length);
if (isBase64) {
// Convert base64 to raw binary data held in a string:
byteString = atob(dataString);
} else {
// Convert base64/URLEncoded data component to raw binary:
byteString = decodeURIComponent(dataString);
}
// Write the bytes of the string to an ArrayBuffer:
arrayBuffer = new ArrayBuffer(byteString.length);
intArray = new Uint8Array(arrayBuffer);
for (i = 0; i < byteString.length; i += 1) {
intArray[i] = byteString.charCodeAt(i);
}
// Write the ArrayBuffer (or ArrayBufferView) to a blob:
if (hasBlobConstructor) {
return new Blob([hasArrayBufferViewSupport ? intArray : arrayBuffer], {
type: mediaType
});
}
bb = new BlobBuilder();
bb.append(arrayBuffer);
return bb.getBlob(mediaType);
};
if (hasCanvasPrototype) {
if (window.HTMLCanvasElement && !CanvasPrototype.toBlob) {
if (CanvasPrototype.mozGetAsFile) {
CanvasPrototype.toBlob = function (callback, type, quality) {
var self = this;
setTimeout(function () {
if (quality && CanvasPrototype.toDataURL && dataURLtoBlob) {
callback(dataURLtoBlob(self.toDataURL(type, quality)));
} else {
callback(self.mozGetAsFile('blob', type));
}
});
};
} else if (CanvasPrototype.toDataURL && dataURLtoBlob) {
if (CanvasPrototype.msToBlob) {
CanvasPrototype.toBlob = function (callback, type, quality) {
var self = this;
setTimeout(function () {
if ((type && type !== 'image/png' || quality) && CanvasPrototype.toDataURL && dataURLtoBlob) {
callback(dataURLtoBlob(self.toDataURL(type, quality)));
} else {
callback(self.msToBlob(type));
}
});
};
} else {
CanvasPrototype.toBlob = function (callback, type, quality) {
var self = this;
setTimeout(function () {
callback(dataURLtoBlob(self.toDataURL(type, quality)));
});
};
}
}
}
}
if (module.exports) {
module.exports = dataURLtoBlob;
} else {
window.dataURLtoBlob = dataURLtoBlob;
}
})(globalThis || window); // shims globalThis to miniprogram
})(canvasToBlob);
var toBlob = canvasToBlob.exports;
var isBlob = value => {
if (typeof Blob === 'undefined') {
return false;
}
return value instanceof Blob || Object.prototype.toString.call(value) === '[object Blob]';
};
var DEFAULTS = {
/**
* Indicates if output the original image instead of the compressed one
* when the size of the compressed image is greater than the original one's
* @type {boolean}
*/
strict: true,
/**
* Indicates if read the image's Exif Orientation information,
* and then rotate or flip the image automatically.
* @type {boolean}
*/
checkOrientation: true,
/**
* The max width of the output image.
* @type {number}
*/
maxWidth: Infinity,
/**
* The max height of the output image.
* @type {number}
*/
maxHeight: Infinity,
/**
* The min width of the output image.
* @type {number}
*/
minWidth: 0,
/**
* The min height of the output image.
* @type {number}
*/
minHeight: 0,
/**
* The width of the output image.
* If not specified, the natural width of the source image will be used.
* @type {number}
*/
width: undefined,
/**
* The height of the output image.
* If not specified, the natural height of the source image will be used.
* @type {number}
*/
height: undefined,
/**
* Sets how the size of the image should be resized to the container
* specified by the `width` and `height` options.
* @type {string}
*/
resize: 'none',
/**
* The quality of the output image.
* It must be a number between `0` and `1`,
* and only available for `image/jpeg` and `image/webp` images.
* Check out {@link https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob canvas.toBlob}.
* @type {number}
*/
quality: 0.8,
/**
* The mime type of the output image.
* By default, the original mime type of the source image file will be used.
* @type {string}
*/
mimeType: 'auto',
/**
* Files whose file type is included in this list,
* and whose file size exceeds the `convertSize` value will be converted to JPEGs.
* @type {string｜Array}
*/
convertTypes: ['image/png'],
/**
* PNG files over this size (5 MB by default) will be converted to JPEGs.
* To disable this, just set the value to `Infinity`.
* @type {number}
*/
convertSize: 5000000,
/**
* The hook function to execute before draw the image into the canvas for compression.
* @type {Function}
* @param {CanvasRenderingContext2D} context - The 2d rendering context of the canvas.
* @param {HTMLCanvasElement} canvas - The canvas for compression.
* @example
* function (context, canvas) {
* context.fillStyle = '#fff';
* }
*/
beforeDraw: null,
/**
* The hook function to execute after drew the image into the canvas for compression.
* @type {Function}
* @param {CanvasRenderingContext2D} context - The 2d rendering context of the canvas.
* @param {HTMLCanvasElement} canvas - The canvas for compression.
* @example
* function (context, canvas) {
* context.filter = 'grayscale(100%)';
* }
*/
drew: null,
/**
* The hook function to execute when success to compress the image.
* @type {Function}
* @param {File} file - The compressed image File object.
* @example
* function (file) {
* console.log(file);
* }
*/
success: null,
/**
* The hook function to execute when fail to compress the image.
* @type {Function}
* @param {Error} err - An Error object.
* @example
* function (err) {
* console.log(err.message);
* }
*/
error: null
};
const IS_BROWSER = typeof window !== 'undefined' && typeof window.document !== 'undefined';
const WINDOW = IS_BROWSER ? window : {};
/**
* Check if the given value is a positive number.
* @param {*} value - The value to check.
* @returns {boolean} Returns `true` if the given value is a positive number, else `false`.
*/
const isPositiveNumber = value => value > 0 && value < Infinity;
const {
slice
} = Array.prototype;
/**
* Convert array-like or iterable object to an array.
* @param {*} value - The value to convert.
* @returns {Array} Returns a new array.
*/
function toArray(value) {
return Array.from ? Array.from(value) : slice.call(value);
}
const REGEXP_IMAGE_TYPE = /^image\/.+$/;
/**
* Check if the given value is a mime type of image.
* @param {*} value - The value to check.
* @returns {boolean} Returns `true` if the given is a mime type of image, else `false`.
*/
function isImageType(value) {
return REGEXP_IMAGE_TYPE.test(value);
}
/**
* Convert image type to extension.
* @param {string} value - The image type to convert.
* @returns {boolean} Returns the image extension.
*/
function imageTypeToExtension(value) {
let extension = isImageType(value) ? value.substr(6) : '';
if (extension === 'jpeg') {
extension = 'jpg';
}
return `.${extension}`;
}
const {
fromCharCode
} = String;
/**
* Get string from char code in data view.
* @param {DataView} dataView - The data view for read.
* @param {number} start - The start index.
* @param {number} length - The read length.
* @returns {string} The read result.
*/
function getStringFromCharCode(dataView, start, length) {
let str = '';
let i;
length += start;
for (i = start; i < length; i += 1) {
str += fromCharCode(dataView.getUint8(i));
}
return str;
}
const {
btoa
} = WINDOW;
/**
* Transform array buffer to Data URL.
* @param {ArrayBuffer} arrayBuffer - The array buffer to transform.
* @param {string} mimeType - The mime type of the Data URL.
* @returns {string} The result Data URL.
*/
function arrayBufferToDataURL(arrayBuffer, mimeType) {
const chunks = [];
const chunkSize = 8192;
let uint8 = new Uint8Array(arrayBuffer);
while (uint8.length > 0) {
// XXX: Babel's `toConsumableArray` helper will throw error in IE or Safari 9
// eslint-disable-next-line prefer-spread
chunks.push(fromCharCode.apply(null, toArray(uint8.subarray(0, chunkSize))));
uint8 = uint8.subarray(chunkSize);
}
return `data:${mimeType};base64,${btoa(chunks.join(''))}`;
}
/**
* Get orientation value from given array buffer.
* @param {ArrayBuffer} arrayBuffer - The array buffer to read.
* @returns {number} The read orientation value.
*/
function resetAndGetOrientation(arrayBuffer) {
const dataView = new DataView(arrayBuffer);
let orientation;
// Ignores range error when the image does not have correct Exif information
try {
let littleEndian;
let app1Start;
let ifdStart;
// Only handle JPEG image (start by 0xFFD8)
if (dataView.getUint8(0) === 0xff && dataView.getUint8(1) === 0xd8) {
const length = dataView.byteLength;
let offset = 2;
while (offset + 1 < length) {
if (dataView.getUint8(offset) === 0xff && dataView.getUint8(offset + 1) === 0xe1) {
app1Start = offset;
break;
}
offset += 1;
}
}
if (app1Start) {
const exifIDCode = app1Start + 4;
const tiffOffset = app1Start + 10;
if (getStringFromCharCode(dataView, exifIDCode, 4) === 'Exif') {
const endianness = dataView.getUint16(tiffOffset);
littleEndian = endianness === 0x4949;
if (littleEndian || endianness === 0x4d4d /* bigEndian */) {
if (dataView.getUint16(tiffOffset + 2, littleEndian) === 0x002a) {
const firstIFDOffset = dataView.getUint32(tiffOffset + 4, littleEndian);
if (firstIFDOffset >= 0x00000008) {
ifdStart = tiffOffset + firstIFDOffset;
}
}
}
}
}
if (ifdStart) {
const length = dataView.getUint16(ifdStart, littleEndian);
let offset;
let i;
for (i = 0; i < length; i += 1) {
offset = ifdStart + i * 12 + 2;
if (dataView.getUint16(offset, littleEndian) === 0x0112 /* Orientation */) {
// 8 is the offset of the current tag's value
offset += 8;
// Get the original orientation value
orientation = dataView.getUint16(offset, littleEndian);
// Override the orientation with its default value
dataView.setUint16(offset, 1, littleEndian);
break;
}
}
}
} catch (e) {
orientation = 1;
}
return orientation;
}
/**
* Parse Exif Orientation value.
* @param {number} orientation - The orientation to parse.
* @returns {Object} The parsed result.
*/
function parseOrientation(orientation) {
let rotate = 0;
let scaleX = 1;
let scaleY = 1;
switch (orientation) {
// Flip horizontal
case 2:
scaleX = -1;
break;
// Rotate left 180°
case 3:
rotate = -180;
break;
// Flip vertical
case 4:
scaleY = -1;
break;
// Flip vertical and rotate right 90°
case 5:
rotate = 90;
scaleY = -1;
break;
// Rotate right 90°
case 6:
rotate = 90;
break;
// Flip horizontal and rotate right 90°
case 7:
rotate = 90;
scaleX = -1;
break;
// Rotate left 90°
case 8:
rotate = -90;
break;
}
return {
rotate,
scaleX,
scaleY
};
}
const REGEXP_DECIMALS = /\.\d*(?:0|9){12}\d*$/;
/**
* Normalize decimal number.
* Check out {@link https://0.30000000000000004.com/}
* @param {number} value - The value to normalize.
* @param {number} [times=100000000000] - The times for normalizing.
* @returns {number} Returns the normalized number.
*/
function normalizeDecimalNumber(value) {
let times = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 100000000000;
return REGEXP_DECIMALS.test(value) ? Math.round(value * times) / times : value;
}
/**
* Get the max sizes in a rectangle under the given aspect ratio.
* @param {Object} data - The original sizes.
* @param {string} [type='contain'] - The adjust type.
* @returns {Object} The result sizes.
*/
function getAdjustedSizes(_ref) {
let {
aspectRatio,
height,
width
} = _ref;
let type = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'none';
const isValidWidth = isPositiveNumber(width);
const isValidHeight = isPositiveNumber(height);
if (isValidWidth && isValidHeight) {
const adjustedWidth = height * aspectRatio;
if ((type === 'contain' || type === 'none') && adjustedWidth > width || type === 'cover' && adjustedWidth < width) {
height = width / aspectRatio;
} else {
width = height * aspectRatio;
}
} else if (isValidWidth) {
height = width / aspectRatio;
} else if (isValidHeight) {
width = height * aspectRatio;
}
return {
width,
height
};
}
const {
ArrayBuffer: ArrayBuffer$1,
FileReader
} = WINDOW;
const URL = WINDOW.URL || WINDOW.webkitURL;
const REGEXP_EXTENSION = /\.\w+$/;
const AnotherCompressor = WINDOW.Compressor;
/**
* Creates a new image compressor.
* @class
*/
class Compressor {
/**
* The constructor of Compressor.
* @param {File|Blob} file - The target image file for compressing.
* @param {Object} [options] - The options for compressing.
*/
constructor(file, options) {
this.file = file;
this.image = new Image();
this.options = {
...DEFAULTS,
...options
};
this.aborted = false;
this.result = null;
this.init();
}
init() {
const {
file,
options
} = this;
if (!isBlob(file)) {
this.fail(new Error('The first argument must be a File or Blob object.'));
return;
}
const mimeType = file.type;
if (!isImageType(mimeType)) {
this.fail(new Error('The first argument must be an image File or Blob object.'));
return;
}
if (!URL || !FileReader) {
this.fail(new Error('The current browser does not support image compression.'));
return;
}
if (!ArrayBuffer$1) {
options.checkOrientation = false;
}
if (URL && !options.checkOrientation) {
this.load({
url: URL.createObjectURL(file)
});
} else {
const reader = new FileReader();
const checkOrientation = options.checkOrientation && mimeType === 'image/jpeg';
this.reader = reader;
reader.onload = _ref => {
let {
target
} = _ref;
const {
result
} = target;
const data = {};
if (checkOrientation) {
// Reset the orientation value to its default value 1
// as some iOS browsers will render image with its orientation
const orientation = resetAndGetOrientation(result);
if (orientation > 1 || !URL) {
// Generate a new URL which has the default orientation value
data.url = arrayBufferToDataURL(result, mimeType);
if (orientation > 1) {
_extends(data, parseOrientation(orientation));
}
} else {
data.url = URL.createObjectURL(file);
}
} else {
data.url = result;
}
this.load(data);
};
reader.onabort = () => {
this.fail(new Error('Aborted to read the image with FileReader.'));
};
reader.onerror = () => {
this.fail(new Error('Failed to read the image with FileReader.'));
};
reader.onloadend = () => {
this.reader = null;
};
if (checkOrientation) {
reader.readAsArrayBuffer(file);
} else {
reader.readAsDataURL(file);
}
}
}
load(data) {
const {
file,
image
} = this;
image.onload = () => {
this.draw({
...data,
naturalWidth: image.naturalWidth,
naturalHeight: image.naturalHeight
});
};
image.onabort = () => {
this.fail(new Error('Aborted to load the image.'));
};
image.onerror = () => {
this.fail(new Error('Failed to load the image.'));
};
// Match all browsers that use WebKit as the layout engine in iOS devices,
// such as Safari for iOS, Chrome for iOS, and in-app browsers.
if (WINDOW.navigator && /(?:iPad|iPhone|iPod).*?AppleWebKit/i.test(WINDOW.navigator.userAgent)) {
// Fix the `The operation is insecure` error (#57)
image.crossOrigin = 'anonymous';
}
image.alt = file.name;
image.src = data.url;
}
draw(_ref2) {
let {
naturalWidth,
naturalHeight,
rotate = 0,
scaleX = 1,
scaleY = 1
} = _ref2;
const {
file,
image,
options
} = this;
const canvas = document.createElement('canvas');
const context = canvas.getContext('2d');
const is90DegreesRotated = Math.abs(rotate) % 180 === 90;
const resizable = (options.resize === 'contain' || options.resize === 'cover') && isPositiveNumber(options.width) && isPositiveNumber(options.height);
let maxWidth = Math.max(options.maxWidth, 0) || Infinity;
let maxHeight = Math.max(options.maxHeight, 0) || Infinity;
let minWidth = Math.max(options.minWidth, 0) || 0;
let minHeight = Math.max(options.minHeight, 0) || 0;
let aspectRatio = naturalWidth / naturalHeight;
let {
width,
height
} = options;
if (is90DegreesRotated) {
[maxWidth, maxHeight] = [maxHeight, maxWidth];
[minWidth, minHeight] = [minHeight, minWidth];
[width, height] = [height, width];
}
if (resizable) {
aspectRatio = width / height;
}
({
width: maxWidth,
height: maxHeight
} = getAdjustedSizes({
aspectRatio,
width: maxWidth,
height: maxHeight
}, 'contain'));
({
width: minWidth,
height: minHeight
} = getAdjustedSizes({
aspectRatio,
width: minWidth,
height: minHeight
}, 'cover'));
if (resizable) {
({
width,
height
} = getAdjustedSizes({
aspectRatio,
width,
height
}, options.resize));
} else {
({
width = naturalWidth,
height = naturalHeight
} = getAdjustedSizes({
aspectRatio,
width,
height
}));
}
width = Math.floor(normalizeDecimalNumber(Math.min(Math.max(width, minWidth), maxWidth)));
height = Math.floor(normalizeDecimalNumber(Math.min(Math.max(height, minHeight), maxHeight)));
const destX = -width / 2;
const destY = -height / 2;
const destWidth = width;
const destHeight = height;
const params = [];
if (resizable) {
let srcX = 0;
let srcY = 0;
let srcWidth = naturalWidth;
let srcHeight = naturalHeight;
({
width: srcWidth,
height: srcHeight
} = getAdjustedSizes({
aspectRatio,
width: naturalWidth,
height: naturalHeight
}, {
contain: 'cover',
cover: 'contain'
}[options.resize]));
srcX = (naturalWidth - srcWidth) / 2;
srcY = (naturalHeight - srcHeight) / 2;
params.push(srcX, srcY, srcWidth, srcHeight);
}
params.push(destX, destY, destWidth, destHeight);
if (is90DegreesRotated) {
[width, height] = [height, width];
}
canvas.width = width;
canvas.height = height;
if (!isImageType(options.mimeType)) {
options.mimeType = file.type;
}
let fillStyle = 'transparent';
// Converts PNG files over the `convertSize` to JPEGs.
if (file.size > options.convertSize && options.convertTypes.indexOf(options.mimeType) >= 0) {
options.mimeType = 'image/jpeg';
}
if (options.mimeType === 'image/jpeg') {
fillStyle = '#fff';
}
// Override the default fill color (#000, black)
context.fillStyle = fillStyle;
context.fillRect(0, 0, width, height);
if (options.beforeDraw) {
options.beforeDraw.call(this, context, canvas);
}
if (this.aborted) {
return;
}
context.save();
context.translate(width / 2, height / 2);
context.rotate(rotate * Math.PI / 180);
context.scale(scaleX, scaleY);
context.drawImage(image, ...params);
context.restore();
if (options.drew) {
options.drew.call(this, context, canvas);
}
if (this.aborted) {
return;
}
const done = result => {
if (!this.aborted) {
this.done({
naturalWidth,
naturalHeight,
result
});
}
};
if (canvas.toBlob) {
canvas.toBlob(done, options.mimeType, options.quality);
} else {
done(toBlob(canvas.toDataURL(options.mimeType, options.quality)));
}
}
done(_ref3) {
let {
naturalWidth,
naturalHeight,
result
} = _ref3;
const {
file,
image,
options
} = this;
if (URL && !options.checkOrientation) {
URL.revokeObjectURL(image.src);
}
if (result) {
// Returns original file if the result is greater than it and without size related options
if (options.strict && result.size > file.size && options.mimeType === file.type && !(options.width > naturalWidth || options.height > naturalHeight || options.minWidth > naturalWidth || options.minHeight > naturalHeight || options.maxWidth < naturalWidth || options.maxHeight < naturalHeight)) {
result = file;
} else {
const date = new Date();
result.lastModified = date.getTime();
result.lastModifiedDate = date;
result.name = file.name;
// Convert the extension to match its type
if (result.name && result.type !== file.type) {
result.name = result.name.replace(REGEXP_EXTENSION, imageTypeToExtension(result.type));
}
}
} else {
// Returns original file if the result is null in some cases.
result = file;
}
this.result = result;
if (options.success) {
options.success.call(this, result);
}
}
fail(err) {
const {
options
} = this;
if (options.error) {
options.error.call(this, err);
} else {
throw err;
}
}
abort() {
if (!this.aborted) {
this.aborted = true;
if (this.reader) {
this.reader.abort();
} else if (!this.image.complete) {
this.image.onload = null;
this.image.onabort();
} else {
this.fail(new Error('The compression process has been aborted.'));
}
}
}
/**
* Get the no conflict compressor class.
* @returns {Compressor} The compressor class.
*/
static noConflict() {
window.Compressor = AnotherCompressor;
return Compressor;
}
/**
* Change the default options.
* @param {Object} options - The new default options.
*/
static setDefaults(options) {
_extends(DEFAULTS, options);
}
}
module.exports = Compressor;