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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 | import {
DEFAULT_FILE_TYPE_EXPORTED,
DEFAULT_IMAGE_QUALITY_EXPORTED,
DEFAULT_IMAGE_ROTATION_DEGREES,
FORM_IMAGE_UPLOADER_DEFAULT_FORMAT_TO_BASE_64_OPTIONS
} from './config.js'
export function formatToBase64({file, item, options = FORM_IMAGE_UPLOADER_DEFAULT_FORMAT_TO_BASE_64_OPTIONS, ...rest}) {
if (file) {
const reader = new window.FileReader()
reader.readAsDataURL(file)
let originalBase64
return new Promise((resolve, reject) => {
reader.onload = () => {
getExifOrientation(file)
.then(getExifOrientationResult => {
/*
* Since Chrome 81, image EXIF orientation is respected by default.
* Latest Safari (13.1 as of now) is also working correctly.
*/
const browserAutoRotates = getComputedStyle(document.body).imageOrientation == 'from-image' // eslint-disable-line
if (!browserAutoRotates) {
switch (getExifOrientationResult) {
case 3:
case 4:
options.rotation = 180
break
case 5:
case 6:
options.rotation = 90
break
case 7:
case 8:
options.rotation = 270
}
}
return resizeImage({
base64Image: reader.result,
...options
})
})
.then(base64Image => {
originalBase64 = base64Image
return cropAndRotateImage({
base64Image,
...options
})
})
.then(value => base64ToBlob(value))
.then(({blob, base64}) => {
resolve({
file,
blob,
originalBase64,
croppedBase64: base64,
rotation: options.rotation,
...rest
})
})
.catch(e => {
resolve({hasErrors: true, ...rest})
})
}
})
} else {
const {url, id, ...rest} = item
return new Promise((resolve, reject) => {
cropAndRotateImage({
imageURL: url,
...options
})
.then(value => base64ToBlob(value))
.then(({blob, base64}) => {
resolve({
url,
blob,
croppedBase64: base64,
id,
...rest
})
})
.catch(e => {
resolve({url, id, hasErrors: true, ...rest})
})
})
}
}
export function resizeImage({base64Image, maxImageWidth, maxImageHeight, imageMimeType}) {
const canvas = document.createElement('canvas')
const context = canvas.getContext('2d')
const image = new Image() // eslint-disable-line
image.src = base64Image
return new Promise((resolve, reject) => {
image.onerror = () => {
reject(new Error(`Image load fails. Origin: File resizing`))
}
image.onload = () => {
const inputWidth = image.naturalWidth
const inputHeight = image.naturalHeight
if (inputHeight > maxImageHeight || inputWidth > maxImageWidth) {
const inputImageAspectRatio = inputWidth / inputHeight
if (inputHeight > inputWidth) {
const scaleFactorHeight = maxImageHeight / inputHeight
canvas.width = maxImageHeight * inputImageAspectRatio
canvas.height = maxImageHeight
context.translate(canvas.width / 2, canvas.height / 2)
context.scale(scaleFactorHeight, scaleFactorHeight)
context.translate(-canvas.width / 2, -canvas.height / 2)
} else {
const scaleFactorWidth = maxImageWidth / inputWidth
canvas.width = maxImageWidth
canvas.height = maxImageWidth / inputImageAspectRatio
context.translate(canvas.width / 2, canvas.height / 2)
context.scale(scaleFactorWidth, scaleFactorWidth)
context.translate(-canvas.width / 2, -canvas.height / 2)
}
context.drawImage(image, (canvas.width - inputWidth) / 2, (canvas.height - inputHeight) / 2)
resolve(canvas.toDataURL(imageMimeType, 1))
} else {
resolve(base64Image)
}
}
})
}
export function cropAndRotateImage({
base64Image,
imageURL,
rotation = DEFAULT_IMAGE_ROTATION_DEGREES,
outputImageAspectRatio,
outputImageAspectRatioDisabled,
imageQuality = DEFAULT_IMAGE_QUALITY_EXPORTED,
imageMimeType = DEFAULT_FILE_TYPE_EXPORTED
}) {
const canvas = document.createElement('canvas')
const context = canvas.getContext('2d')
const image = new Image() // eslint-disable-line
if (imageURL) {
image.crossOrigin = 'Anonymous'
}
if (base64Image) {
image.src = base64Image
} else {
image.src = imageURL
}
return new Promise((resolve, reject) => {
image.onerror = () => {
reject(new Error(`Image load fails. Origin: ${imageURL ? `URL ${imageURL}` : `File upload`}`))
}
image.onload = () => {
const inputWidth = image.naturalWidth
const inputHeight = image.naturalHeight
let outputWidth
let outputHeight
let inputImageAspectRatio
if (rotation === 0 || rotation === 180) {
inputImageAspectRatio = inputWidth / inputHeight
outputWidth = inputWidth
outputHeight = inputHeight
} else {
inputImageAspectRatio = inputHeight / inputWidth
outputWidth = inputHeight
outputHeight = inputWidth
}
if (!outputImageAspectRatioDisabled) {
if (inputImageAspectRatio > outputImageAspectRatio) {
outputWidth = outputHeight * outputImageAspectRatio
} else if (inputImageAspectRatio < outputImageAspectRatio) {
outputHeight = outputWidth / outputImageAspectRatio
}
}
canvas.width = outputWidth
canvas.height = outputHeight
switch (rotation) {
case 0:
context.translate((outputWidth - inputWidth) * 0.5, (outputHeight - inputHeight) * 0.5)
break
case 90:
context.rotate(0.5 * Math.PI)
context.translate((outputHeight - inputWidth) * 0.5, -(outputWidth + inputHeight) * 0.5)
break
case 180:
context.rotate(Math.PI)
context.translate(-(outputWidth + inputWidth) * 0.5, -(outputHeight + inputHeight) * 0.5)
break
case 270:
context.rotate((270 * Math.PI) / 180)
context.translate(-(outputHeight + inputWidth) * 0.5, (outputWidth - inputHeight) * 0.5)
}
context.drawImage(image, 0, 0)
resolve(canvas.toDataURL(imageMimeType, imageQuality))
}
})
}
/**
*
* @param {String} base64 to transform to Blob type
* @param {String} imageMimeType to define the Blob's MIME type (default: JPEG)
*
* returns a new Blob and the original base64 string
*/
export function base64ToBlob(base64, imageMimeType = DEFAULT_FILE_TYPE_EXPORTED) {
var byteString = atob(base64.split(',')[1]) // eslint-disable-line
const ab = new ArrayBuffer(byteString.length)
const ia = new Uint8Array(ab)
for (let i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i)
}
return new Promise(resolve => resolve({blob: new Blob([ia], {type: imageMimeType}), base64})) // eslint-disable-line
}
/**
*
* @param {File} file containing image data
*
* returns a number, with this possible values:
* 1, 2, 3, 4, 5, 6, 7 or 8 : EXIF orientation values
* -1 : EXIF orientation value not defined
* -2 : not a JPEG type file
*/
function getExifOrientation(file) {
const reader = new window.FileReader()
return new Promise((resolve, reject) => {
reader.onload = function (e) {
const view = new DataView(e.target.result)
if (view.getUint16(0, false) !== 0xffd8) {
resolve(-2)
}
const length = view.byteLength
let offset = 2
while (offset < length) {
if (offset + 2 > view.byteLength) {
break
}
if (view.getUint16(offset + 2, false) <= 8) resolve(-1)
const marker = view.getUint16(offset, false)
offset += 2
if (marker === 0xffe1) {
if (view.getUint32((offset += 2), false) !== 0x45786966) {
resolve(-1)
}
const little = view.getUint16((offset += 6), false) === 0x4949
offset += view.getUint32(offset + 4, little)
const tags = view.getUint16(offset, little)
offset += 2
for (let i = 0; i < tags; i++) {
if (view.getUint16(offset + i * 12, little) === 0x0112) {
resolve(view.getUint16(offset + i * 12 + 8, little))
}
}
} else if ((marker && 0xff00) !== 0xff00) {
break
} else {
offset += view.getUint16(offset, false)
}
}
resolve(-1)
}
reader.readAsArrayBuffer(file)
})
}
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