ngx-image-cropper-upgraded
Version:
An image cropper for Angular upgraded by Spymannn
120 lines • 12.8 kB
JavaScript
/**
* @fileoverview added by tsickle
* Generated from: lib/utils/exif.utils.ts
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
// Black 2x1 JPEG, with the following meta information set:
// - EXIF Orientation: 6 (Rotated 90° CCW)
// Source: https://github.com/blueimp/JavaScript-Load-Image
/** @type {?} */
var testAutoOrientationImageURL = 'data:image/jpeg;base64,/9j/4QAiRXhpZgAATU0AKgAAAAgAAQESAAMAAAABAAYAAAA' +
'AAAD/2wCEAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBA' +
'QEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE' +
'BAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAf/AABEIAAEAAgMBEQACEQEDEQH/x' +
'ABKAAEAAAAAAAAAAAAAAAAAAAALEAEAAAAAAAAAAAAAAAAAAAAAAQEAAAAAAAAAAAAAAAA' +
'AAAAAEQEAAAAAAAAAAAAAAAAAAAAA/9oADAMBAAIRAxEAPwA/8H//2Q==';
/**
* @return {?}
*/
export function supportsAutomaticRotation() {
return new Promise((/**
* @param {?} resolve
* @return {?}
*/
function (resolve) {
/** @type {?} */
var img = new Image();
img.onload = (/**
* @return {?}
*/
function () {
// Check if browser supports automatic image orientation:
/** @type {?} */
var supported = img.width === 1 && img.height === 2;
resolve(supported);
});
img.src = testAutoOrientationImageURL;
}));
}
/**
* @param {?} exifRotationOrBase64Image
* @return {?}
*/
export function getTransformationsFromExifData(exifRotationOrBase64Image) {
if (typeof exifRotationOrBase64Image === 'string') {
exifRotationOrBase64Image = getExifRotation(exifRotationOrBase64Image);
}
switch (exifRotationOrBase64Image) {
case 2: return { rotate: 0, flip: true };
case 3: return { rotate: 2, flip: false };
case 4: return { rotate: 2, flip: true };
case 5: return { rotate: 1, flip: true };
case 6: return { rotate: 1, flip: false };
case 7: return { rotate: 3, flip: true };
case 8: return { rotate: 3, flip: false };
default: return { rotate: 0, flip: false };
}
}
/**
* @param {?} imageBase64
* @return {?}
*/
function getExifRotation(imageBase64) {
/** @type {?} */
var view = new DataView(base64ToArrayBuffer(imageBase64));
if (view.getUint16(0, false) != 0xFFD8) {
return -2;
}
/** @type {?} */
var length = view.byteLength;
/** @type {?} */
var offset = 2;
while (offset < length) {
if (view.getUint16(offset + 2, false) <= 8)
return -1;
/** @type {?} */
var marker = view.getUint16(offset, false);
offset += 2;
if (marker == 0xFFE1) {
if (view.getUint32(offset += 2, false) != 0x45786966) {
return -1;
}
/** @type {?} */
var little = view.getUint16(offset += 6, false) == 0x4949;
offset += view.getUint32(offset + 4, little);
/** @type {?} */
var tags = view.getUint16(offset, little);
offset += 2;
for (var i = 0; i < tags; i++) {
if (view.getUint16(offset + (i * 12), little) == 0x0112) {
return view.getUint16(offset + (i * 12) + 8, little);
}
}
}
else if ((marker & 0xFF00) != 0xFF00) {
break;
}
else {
offset += view.getUint16(offset, false);
}
}
return -1;
}
/**
* @param {?} imageBase64
* @return {?}
*/
function base64ToArrayBuffer(imageBase64) {
imageBase64 = imageBase64.replace(/^data\:([^\;]+)\;base64,/gmi, '');
/** @type {?} */
var binaryString = atob(imageBase64);
/** @type {?} */
var len = binaryString.length;
/** @type {?} */
var bytes = new Uint8Array(len);
for (var i = 0; i < len; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes.buffer;
}
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EXIF Orientation: 6 (Rotated 90° CCW)\n// Source: https://github.com/blueimp/JavaScript-Load-Image\nconst testAutoOrientationImageURL =\n    'data:image/jpeg;base64,/9j/4QAiRXhpZgAATU0AKgAAAAgAAQESAAMAAAABAAYAAAA' +\n    'AAAD/2wCEAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBA' +\n    'QEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE' +\n    'BAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAf/AABEIAAEAAgMBEQACEQEDEQH/x' +\n    'ABKAAEAAAAAAAAAAAAAAAAAAAALEAEAAAAAAAAAAAAAAAAAAAAAAQEAAAAAAAAAAAAAAAA' +\n    'AAAAAEQEAAAAAAAAAAAAAAAAAAAAA/9oADAMBAAIRAxEAPwA/8H//2Q==';\n\nexport function supportsAutomaticRotation(): Promise<boolean> {\n    return new Promise((resolve) => {\n        const img = new Image();\n        img.onload = () => {\n            // Check if browser supports automatic image orientation:\n            const supported = img.width === 1 && img.height === 2;\n            resolve(supported);\n        };\n        img.src = testAutoOrientationImageURL;\n    });\n}\n\nexport function getTransformationsFromExifData(exifRotationOrBase64Image: number | string): ExifTransform {\n    if (typeof exifRotationOrBase64Image === 'string') {\n        exifRotationOrBase64Image = getExifRotation(exifRotationOrBase64Image);\n    }\n    switch (exifRotationOrBase64Image) {\n        case 2: return {rotate: 0, flip: true};\n        case 3: return {rotate: 2, flip: false};\n        case 4: return {rotate: 2, flip: true};\n        case 5: return {rotate: 1, flip: true};\n        case 6: return {rotate: 1, flip: false};\n        case 7: return {rotate: 3, flip: true};\n        case 8: return {rotate: 3, flip: false};\n        default: return {rotate: 0, flip: false};\n    }\n}\n\nfunction getExifRotation(imageBase64: string): number {\n    const view = new DataView(base64ToArrayBuffer(imageBase64));\n    if (view.getUint16(0, false) != 0xFFD8) {\n        return -2;\n    }\n    const length = view.byteLength;\n    let offset = 2;\n    while (offset < length) {\n        if (view.getUint16(offset + 2, false) <= 8) return -1;\n        const marker = view.getUint16(offset, false);\n        offset += 2;\n        if (marker == 0xFFE1) {\n            if (view.getUint32(offset += 2, false) != 0x45786966) {\n                return -1;\n            }\n\n            const little = view.getUint16(offset += 6, false) == 0x4949;\n            offset += view.getUint32(offset + 4, little);\n            const tags = view.getUint16(offset, little);\n            offset += 2;\n            for (let i = 0; i < tags; i++) {\n                if (view.getUint16(offset + (i * 12), little) == 0x0112) {\n                    return view.getUint16(offset + (i * 12) + 8, little);\n                }\n            }\n        } else if ((marker & 0xFF00) != 0xFF00) {\n            break;\n        } else {\n            offset += view.getUint16(offset, false);\n        }\n    }\n    return -1;\n}\n\nfunction base64ToArrayBuffer(imageBase64: string) {\n    imageBase64 = imageBase64.replace(/^data\\:([^\\;]+)\\;base64,/gmi, '');\n    const binaryString = atob(imageBase64);\n    const len = binaryString.length;\n    const bytes = new Uint8Array(len);\n    for (let i = 0; i < len; i++) {\n        bytes[i] = binaryString.charCodeAt(i);\n    }\n    return bytes.buffer;\n}\n"]}