@rangertechnologies/ngnxt
Version:
This library was used for creating dymanic UI based on the input JSON/data
194 lines • 31.3 kB
JavaScript
import { getTransformationsFromExifData, supportsAutomaticRotation } from '../utils/exif.utils';
export class LoadImageService {
autoRotateSupported = supportsAutomaticRotation();
async loadImageFile(file, cropperSettings) {
const arrayBuffer = await file.arrayBuffer();
if (cropperSettings.options.checkImageType) {
return await this.checkImageTypeAndLoadImageFromArrayBuffer(arrayBuffer, file.type, cropperSettings);
}
return await this.loadImageFromArrayBuffer(arrayBuffer, cropperSettings);
}
checkImageTypeAndLoadImageFromArrayBuffer(arrayBuffer, imageType, cropperSettings) {
if (!this.isValidImageType(imageType)) {
return Promise.reject(new Error('Invalid image type'));
}
return this.loadImageFromArrayBuffer(arrayBuffer, cropperSettings, imageType);
}
isValidImageType(type) {
return /image\/(png|jpg|jpeg|heic|bmp|gif|tiff|svg|webp|x-icon|vnd.microsoft.icon)/.test(type);
}
async loadImageFromURL(url, cropperSettings) {
const res = await fetch(url);
const blob = await res.blob();
const buffer = await blob.arrayBuffer();
return await this.loadImageFromArrayBuffer(buffer, cropperSettings, blob.type);
}
loadBase64Image(imageBase64, cropperSettings) {
const arrayBuffer = this.base64ToArrayBuffer(imageBase64);
return this.loadImageFromArrayBuffer(arrayBuffer, cropperSettings);
}
base64ToArrayBuffer(imageBase64) {
imageBase64 = imageBase64.replace(/^data:([^;]+);base64,/gmi, '');
const binaryString = atob(imageBase64);
const len = binaryString.length;
const bytes = new Uint8Array(len);
for (let i = 0; i < len; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes.buffer;
}
async loadImageFromArrayBuffer(arrayBuffer, cropperState, imageType) {
const res = await new Promise(async (resolve, reject) => {
try {
const blob = new Blob([arrayBuffer], imageType ? { type: imageType } : undefined);
const objectUrl = URL.createObjectURL(blob);
const originalImage = new Image();
const isSvg = imageType === 'image/svg+xml';
const originalImageSize = isSvg ? await this.getSvgImageSize(blob) : undefined;
originalImage.onload = () => resolve({
originalImage,
originalImageSize,
originalObjectUrl: objectUrl,
originalArrayBuffer: arrayBuffer
});
originalImage.onerror = reject;
originalImage.src = objectUrl;
}
catch (e) {
reject(e);
}
});
return await this.transformImageFromArrayBuffer(res, cropperState, res.originalImageSize != null);
}
async getSvgImageSize(blob) {
const parser = new DOMParser();
const doc = parser.parseFromString(await blob.text(), 'image/svg+xml');
const svgElement = doc.querySelector('svg');
if (!svgElement) {
throw Error('Failed to parse SVG image');
}
const widthAttr = svgElement.getAttribute('width');
const heightAttr = svgElement.getAttribute('height');
if (widthAttr && heightAttr) {
return null;
}
const viewBoxAttr = svgElement.getAttribute('viewBox')
|| svgElement.getAttribute('viewbox');
if (viewBoxAttr) {
const viewBox = viewBoxAttr.split(' ');
return {
width: +viewBox[2],
height: +viewBox[3]
};
}
throw Error('Failed to load SVG image. SVG must have width + height or viewBox definition.');
}
async transformImageFromArrayBuffer(res, cropperSettings, forceTransform = false) {
const autoRotate = await this.autoRotateSupported;
const exifTransform = getTransformationsFromExifData(autoRotate ? -1 : res.originalArrayBuffer);
if (!res.originalImage || !res.originalImage.complete) {
return Promise.reject(new Error('No image loaded'));
}
const loadedImage = {
original: {
objectUrl: res.originalObjectUrl,
image: res.originalImage,
size: res.originalImageSize ?? {
width: res.originalImage.naturalWidth,
height: res.originalImage.naturalHeight
}
},
exifTransform
};
return this.transformLoadedImage(loadedImage, cropperSettings, forceTransform);
}
async transformLoadedImage(loadedImage, cropperState, forceTransform = false) {
const canvasRotation = cropperState.options.canvasRotation + loadedImage.exifTransform.rotate;
const originalSize = loadedImage.original.size;
if (!forceTransform && canvasRotation === 0 && !loadedImage.exifTransform.flip && !cropperState.options.containWithinAspectRatio) {
return {
original: {
objectUrl: loadedImage.original.objectUrl,
image: loadedImage.original.image,
size: { ...originalSize }
},
transformed: {
objectUrl: loadedImage.original.objectUrl,
image: loadedImage.original.image,
size: { ...originalSize }
},
exifTransform: loadedImage.exifTransform
};
}
const transformedSize = this.getTransformedSize(originalSize, loadedImage.exifTransform, cropperState);
const canvas = document.createElement('canvas');
canvas.width = transformedSize.width;
canvas.height = transformedSize.height;
const ctx = canvas.getContext('2d');
ctx?.setTransform(loadedImage.exifTransform.flip ? -1 : 1, 0, 0, 1, canvas.width / 2, canvas.height / 2);
ctx?.rotate(Math.PI * (canvasRotation / 2));
ctx?.drawImage(loadedImage.original.image, -originalSize.width / 2, -originalSize.height / 2);
const blob = await new Promise(resolve => canvas.toBlob(resolve, cropperState.options.format));
if (!blob) {
throw new Error('Failed to get Blob for transformed image.');
}
const objectUrl = URL.createObjectURL(blob);
const transformedImage = await this.loadImageFromObjectUrl(objectUrl);
return {
original: {
objectUrl: loadedImage.original.objectUrl,
image: loadedImage.original.image,
size: { ...originalSize }
},
transformed: {
objectUrl: objectUrl,
image: transformedImage,
size: {
width: transformedImage.width,
height: transformedImage.height
}
},
exifTransform: loadedImage.exifTransform
};
}
loadImageFromObjectUrl(objectUrl) {
return new Promise(((resolve, reject) => {
const image = new Image();
image.onload = () => resolve(image);
image.onerror = reject;
image.src = objectUrl;
}));
}
getTransformedSize(originalSize, exifTransform, cropperState) {
const canvasRotation = cropperState.options.canvasRotation + exifTransform.rotate;
if (cropperState.options.containWithinAspectRatio) {
if (canvasRotation % 2) {
const minWidthToContain = originalSize.width * cropperState.options.aspectRatio;
const minHeightToContain = originalSize.height / cropperState.options.aspectRatio;
return {
width: Math.max(originalSize.height, minWidthToContain),
height: Math.max(originalSize.width, minHeightToContain)
};
}
else {
const minWidthToContain = originalSize.height * cropperState.options.aspectRatio;
const minHeightToContain = originalSize.width / cropperState.options.aspectRatio;
return {
width: Math.max(originalSize.width, minWidthToContain),
height: Math.max(originalSize.height, minHeightToContain)
};
}
}
if (canvasRotation % 2) {
return {
height: originalSize.width,
width: originalSize.height
};
}
return {
width: originalSize.width,
height: originalSize.height
};
}
}
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{ Dimensions, LoadedImage } from '../interfaces';\nimport { CropperState } from '../component/cropper.state';\nimport { ExifTransform } from '../interfaces/exif-transform.interface';\nimport { getTransformationsFromExifData, supportsAutomaticRotation } from '../utils/exif.utils';\n\ninterface LoadImageArrayBuffer {\n  originalImage: HTMLImageElement;\n  originalArrayBuffer: ArrayBufferLike;\n  originalObjectUrl: string;\n  originalImageSize?: { width: number; height: number; } | null;\n}\n\nexport class LoadImageService {\n\n  private autoRotateSupported: Promise<boolean> = supportsAutomaticRotation();\n\n  async loadImageFile(file: File, cropperSettings: CropperState): Promise<LoadedImage> {\n    const arrayBuffer = await file.arrayBuffer();\n    if (cropperSettings.options.checkImageType) {\n      return await this.checkImageTypeAndLoadImageFromArrayBuffer(arrayBuffer, file.type, cropperSettings);\n    }\n    return await this.loadImageFromArrayBuffer(arrayBuffer, cropperSettings);\n  }\n\n  private checkImageTypeAndLoadImageFromArrayBuffer(arrayBuffer: ArrayBufferLike, imageType: string, cropperSettings: CropperState): Promise<LoadedImage> {\n    if (!this.isValidImageType(imageType)) {\n      return Promise.reject(new Error('Invalid image type'));\n    }\n    return this.loadImageFromArrayBuffer(arrayBuffer, cropperSettings, imageType);\n  }\n\n  private isValidImageType(type: string): boolean {\n    return /image\\/(png|jpg|jpeg|heic|bmp|gif|tiff|svg|webp|x-icon|vnd.microsoft.icon)/.test(type);\n  }\n\n  async loadImageFromURL(url: string, cropperSettings: CropperState): Promise<LoadedImage> {\n    const res = await fetch(url);\n    const blob = await res.blob();\n    const buffer = await blob.arrayBuffer();\n    return await this.loadImageFromArrayBuffer(buffer, cropperSettings, blob.type);\n  }\n\n  loadBase64Image(imageBase64: string, cropperSettings: CropperState): Promise<LoadedImage> {\n    const arrayBuffer = this.base64ToArrayBuffer(imageBase64);\n    return this.loadImageFromArrayBuffer(arrayBuffer, cropperSettings);\n  }\n\n  private base64ToArrayBuffer(imageBase64: string): ArrayBufferLike {\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\n  private async loadImageFromArrayBuffer(arrayBuffer: ArrayBufferLike, cropperState: CropperState, imageType?: string): Promise<LoadedImage> {\n    const res = await new Promise<LoadImageArrayBuffer>(async (resolve, reject) => {\n      try {\n        const blob = new Blob([arrayBuffer], imageType ? {type: imageType} : undefined);\n        const objectUrl = URL.createObjectURL(blob);\n        const originalImage = new Image();\n        const isSvg = imageType === 'image/svg+xml';\n        const originalImageSize = isSvg ? await this.getSvgImageSize(blob) : undefined;\n        originalImage.onload = () => resolve({\n          originalImage,\n          originalImageSize,\n          originalObjectUrl: objectUrl,\n          originalArrayBuffer: arrayBuffer\n        });\n        originalImage.onerror = reject;\n        originalImage.src = objectUrl;\n      } catch (e) {\n        reject(e);\n      }\n    });\n    return await this.transformImageFromArrayBuffer(res, cropperState, res.originalImageSize != null);\n  }\n\n  private async getSvgImageSize(blob: Blob): Promise<{ width: number; height: number; } | null> {\n    const parser = new DOMParser();\n    const doc = parser.parseFromString(await blob.text(), 'image/svg+xml');\n    const svgElement = doc.querySelector('svg');\n    if (!svgElement) {\n      throw Error('Failed to parse SVG image');\n    }\n    const widthAttr = svgElement.getAttribute('width');\n    const heightAttr = svgElement.getAttribute('height');\n    if (widthAttr && heightAttr) {\n      return null;\n    }\n    const viewBoxAttr = svgElement.getAttribute('viewBox')\n      || svgElement.getAttribute('viewbox');\n    if (viewBoxAttr) {\n      const viewBox = viewBoxAttr.split(' ');\n      return {\n        width: +viewBox[2],\n        height: +viewBox[3]\n      };\n    }\n    throw Error('Failed to load SVG image. SVG must have width + height or viewBox definition.');\n  }\n\n  private async transformImageFromArrayBuffer(res: LoadImageArrayBuffer, cropperSettings: CropperState, forceTransform = false): Promise<LoadedImage> {\n    const autoRotate = await this.autoRotateSupported;\n    const exifTransform = getTransformationsFromExifData(autoRotate ? -1 : res.originalArrayBuffer);\n    if (!res.originalImage || !res.originalImage.complete) {\n      return Promise.reject(new Error('No image loaded'));\n    }\n    const loadedImage = {\n      original: {\n        objectUrl: res.originalObjectUrl,\n        image: res.originalImage,\n        size: res.originalImageSize ?? {\n          width: res.originalImage.naturalWidth,\n          height: res.originalImage.naturalHeight\n        }\n      },\n      exifTransform\n    };\n    return this.transformLoadedImage(loadedImage, cropperSettings, forceTransform);\n  }\n\n  async transformLoadedImage(loadedImage: Partial<LoadedImage>, cropperState: CropperState, forceTransform = false): Promise<LoadedImage> {\n    const canvasRotation = cropperState.options.canvasRotation + loadedImage.exifTransform!.rotate;\n    const originalSize = loadedImage.original!.size;\n    if (!forceTransform && canvasRotation === 0 && !loadedImage.exifTransform!.flip && !cropperState.options.containWithinAspectRatio) {\n      return {\n        original: {\n          objectUrl: loadedImage.original!.objectUrl,\n          image: loadedImage.original!.image,\n          size: {...originalSize}\n        },\n        transformed: {\n          objectUrl: loadedImage.original!.objectUrl,\n          image: loadedImage.original!.image,\n          size: {...originalSize}\n        },\n        exifTransform: loadedImage.exifTransform!\n      };\n    }\n\n    const transformedSize = this.getTransformedSize(originalSize, loadedImage.exifTransform!, cropperState);\n    const canvas = document.createElement('canvas');\n    canvas.width = transformedSize.width;\n    canvas.height = transformedSize.height;\n    const ctx = canvas.getContext('2d');\n    ctx?.setTransform(\n      loadedImage.exifTransform!.flip ? -1 : 1,\n      0,\n      0,\n      1,\n      canvas.width / 2,\n      canvas.height / 2\n    );\n    ctx?.rotate(Math.PI * (canvasRotation / 2));\n    ctx?.drawImage(\n      loadedImage.original!.image,\n      -originalSize.width / 2,\n      -originalSize.height / 2\n    );\n    const blob = await new Promise<Blob | null>(resolve => canvas.toBlob(resolve, cropperState.options.format));\n    if (!blob) {\n      throw new Error('Failed to get Blob for transformed image.');\n    }\n    const objectUrl = URL.createObjectURL(blob);\n    const transformedImage = await this.loadImageFromObjectUrl(objectUrl);\n    return {\n      original: {\n        objectUrl: loadedImage.original!.objectUrl,\n        image: loadedImage.original!.image,\n        size: {...originalSize}\n      },\n      transformed: {\n        objectUrl: objectUrl,\n        image: transformedImage,\n        size: {\n          width: transformedImage.width,\n          height: transformedImage.height\n        }\n      },\n      exifTransform: loadedImage.exifTransform!\n    };\n  }\n\n  private loadImageFromObjectUrl(objectUrl: string): Promise<HTMLImageElement> {\n    return new Promise<HTMLImageElement>(((resolve, reject) => {\n      const image = new Image();\n      image.onload = () => resolve(image);\n      image.onerror = reject;\n      image.src = objectUrl;\n    }));\n  }\n\n  private getTransformedSize(\n    originalSize: { width: number, height: number },\n    exifTransform: ExifTransform,\n    cropperState: CropperState\n  ): Dimensions {\n    const canvasRotation = cropperState.options.canvasRotation + exifTransform.rotate;\n    if (cropperState.options.containWithinAspectRatio) {\n      if (canvasRotation % 2) {\n        const minWidthToContain = originalSize.width * cropperState.options.aspectRatio;\n        const minHeightToContain = originalSize.height / cropperState.options.aspectRatio;\n        return {\n          width: Math.max(originalSize.height, minWidthToContain),\n          height: Math.max(originalSize.width, minHeightToContain)\n        };\n      } else {\n        const minWidthToContain = originalSize.height * cropperState.options.aspectRatio;\n        const minHeightToContain = originalSize.width / cropperState.options.aspectRatio;\n        return {\n          width: Math.max(originalSize.width, minWidthToContain),\n          height: Math.max(originalSize.height, minHeightToContain)\n        };\n      }\n    }\n\n    if (canvasRotation % 2) {\n      return {\n        height: originalSize.width,\n        width: originalSize.height\n      };\n    }\n    return {\n      width: originalSize.width,\n      height: originalSize.height\n    };\n  }\n}\n"]}