ngx-image-cropper
Version:
An image cropper for Angular
75 lines • 16 kB
JavaScript
// Black 2x1 JPEG, with the following meta information set:
// - EXIF Orientation: 6 (Rotated 90° CCW)
// Source: https://github.com/blueimp/JavaScript-Load-Image
const testAutoOrientationImageByteArray = [new Uint8Array([255, 216, 255, 225, 0, 34, 69, 120, 105, 102, 0, 0, 77, 77, 0, 42, 0, 0, 0, 8, 0, 1, 1, 18, 0, 3, 0, 0, 0, 1, 0, 6, 0, 0, 0, 0, 0, 0, 255, 219, 0, 132, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 255, 192, 0, 17, 8, 0, 1, 0, 2, 3, 1, 17, 0, 2, 17, 1, 3, 17, 1, 255, 196, 0, 74, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 16, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 17, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 218, 0, 12, 3, 1, 0, 2, 17, 3, 17, 0, 63, 0, 63, 240, 127, 255, 217])];
const testAutoOrientationImageURL = URL.createObjectURL(new Blob(testAutoOrientationImageByteArray, { type: 'image/jpeg' }));
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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{ ExifTransform } from '../interfaces/exif-transform.interface';\n\n// Black 2x1 JPEG, with the following meta information set:\n// - EXIF Orientation: 6 (Rotated 90° CCW)\n// Source: https://github.com/blueimp/JavaScript-Load-Image\nconst testAutoOrientationImageByteArray = [new Uint8Array([255, 216, 255, 225, 0, 34, 69, 120, 105, 102, 0, 0, 77, 77, 0, 42, 0, 0, 0, 8, 0, 1, 1, 18, 0, 3, 0, 0, 0, 1, 0, 6, 0, 0, 0, 0, 0, 0, 255, 219, 0, 132, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 255, 192, 0, 17, 8, 0, 1, 0, 2, 3, 1, 17, 0, 2, 17, 1, 3, 17, 1, 255, 196, 0, 74, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 16, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 17, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 218, 0, 12, 3, 1, 0, 2, 17, 3, 17, 0, 63, 0, 63, 240, 127, 255, 217])];\nconst testAutoOrientationImageURL = URL.createObjectURL(new Blob(testAutoOrientationImageByteArray, {type: 'image/jpeg'}));\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): 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"]}