@asoftwareworld/form-builder-pro
Version:
ASW Form Builder Pro helps you with rapid development and designed web forms which includes several controls. The key feature of Form Builder is to make your content attractive and effective. We can customize our control at run time and preview the same b
86 lines • 11.5 kB
JavaScript
/**
* @license
* Copyright ASW (A Software World) All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file
*/
// Black 2x1 JPEG, with the following meta information set:
// - EXIF Orientation: 6 (Rotated 90° CCW)
// Source: https://github.com/blueimp/JavaScript-Load-Image
const testAutoOrientationImageURL = 'data:image/jpeg;base64,/9j/4QAiRXhpZgAATU0AKgAAAAgAAQESAAMAAAABAAYAAAA' +
'AAAD/2wCEAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBA' +
'QEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE' +
'BAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAf/AABEIAAEAAgMBEQACEQEDEQH/x' +
'ABKAAEAAAAAAAAAAAAAAAAAAAALEAEAAAAAAAAAAAAAAAAAAAAAAQEAAAAAAAAAAAAAAAA' +
'AAAAAEQEAAAAAAAAAAAAAAAAAAAAA/9oADAMBAAIRAxEAPwA/8H//2Q==';
export function supportsAutomaticRotation() {
return new Promise((resolve) => {
const img = new Image();
img.onload = () => {
// Check if browser supports automatic image orientation:
const supported = img.width === 1 && img.height === 2;
resolve(supported);
};
img.src = testAutoOrientationImageURL;
});
}
export function getTransformationsFromExifData(exifRotationOrArrayBuffer) {
if (typeof exifRotationOrArrayBuffer === 'object') {
exifRotationOrArrayBuffer = getExifRotation(exifRotationOrArrayBuffer);
}
switch (exifRotationOrArrayBuffer) {
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 };
}
}
function getExifRotation(arrayBuffer) {
const view = new DataView(arrayBuffer);
if (view.getUint16(0, false) !== 0xffd8) {
return -2;
}
const length = view.byteLength;
let offset = 2;
while (offset < length) {
if (view.getUint16(offset + 2, false) <= 8)
return -1;
const marker = view.getUint16(offset, false);
offset += 2;
if (marker == 0xffe1) {
if (view.getUint32((offset += 2), false) !== 0x45786966) {
return -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) {
return view.getUint16(offset + i * 12 + 8, little);
}
}
}
else if ((marker & 0xff00) !== 0xff00) {
break;
}
else {
offset += view.getUint16(offset, false);
}
}
return -1;
}
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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(exifRotationOrArrayBuffer: number | ArrayBufferLike | any): ExifTransform {\n    if (typeof exifRotationOrArrayBuffer === 'object') {\n        exifRotationOrArrayBuffer = getExifRotation(exifRotationOrArrayBuffer);\n    }\n    switch (exifRotationOrArrayBuffer) {\n        case 2:\n            return { rotate: 0, flip: true };\n        case 3:\n            return { rotate: 2, flip: false };\n        case 4:\n            return { rotate: 2, flip: true };\n        case 5:\n            return { rotate: 1, flip: true };\n        case 6:\n            return { rotate: 1, flip: false };\n        case 7:\n            return { rotate: 3, flip: true };\n        case 8:\n            return { rotate: 3, flip: false };\n        default:\n            return { rotate: 0, flip: false };\n    }\n}\n\nfunction getExifRotation(arrayBuffer: ArrayBufferLike): number {\n    const view = new DataView(arrayBuffer);\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"]}