ng7-pica
Version:
Angular module to resize images files in browser
327 lines (326 loc) • 36.8 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
*/
import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';
import { NgxPicaErrorType } from './ngx-pica-error.interface';
import { NgxPicaExifService } from './ngx-pica-exif.service';
import Pica from 'pica';
export class NgxPicaService {
/**
* @param {?} _ngxPicaExifService
*/
constructor(_ngxPicaExifService) {
this._ngxPicaExifService = _ngxPicaExifService;
this.picaResizer = new Pica();
this.MAX_STEPS = 20;
if (!this.picaResizer || !this.picaResizer.resize) {
this.picaResizer = new window.Pica();
}
}
/**
* @param {?} files
* @param {?} width
* @param {?} height
* @param {?=} options
* @return {?}
*/
resizeImages(files, width, height, options) {
/** @type {?} */
const resizedImage = new Subject();
/** @type {?} */
const totalFiles = files.length;
if (totalFiles > 0) {
/** @type {?} */
const nextFile = new Subject();
/** @type {?} */
let index = 0;
/** @type {?} */
const subscription = nextFile.subscribe((file) => {
this.resizeImage(file, width, height, options).subscribe(imageResized => {
index++;
resizedImage.next(imageResized);
if (index < totalFiles) {
nextFile.next(files[index]);
}
else {
resizedImage.complete();
subscription.unsubscribe();
}
}, (err) => {
/** @type {?} */
const ngxPicaError = {
file: file,
err: err
};
resizedImage.error(ngxPicaError);
});
});
nextFile.next(files[index]);
}
else {
/** @type {?} */
const ngxPicaError = {
err: NgxPicaErrorType.NO_FILES_RECEIVED
};
resizedImage.error(ngxPicaError);
resizedImage.complete();
}
return resizedImage.asObservable();
}
/**
* @param {?} file
* @param {?} width
* @param {?} height
* @param {?=} options
* @return {?}
*/
resizeImage(file, width, height, options) {
/** @type {?} */
const resizedImage = new Subject();
/** @type {?} */
const originCanvas = document.createElement('canvas');
/** @type {?} */
const ctx = originCanvas.getContext('2d');
/** @type {?} */
const img = new Image();
if (ctx) {
img.onload = () => {
this._ngxPicaExifService.getExifOrientedImage(img).then(orientedImage => {
window.URL.revokeObjectURL(img.src);
originCanvas.width = orientedImage.width;
originCanvas.height = orientedImage.height;
ctx.drawImage(orientedImage, 0, 0);
/** @type {?} */
const imageData = ctx.getImageData(0, 0, orientedImage.width, orientedImage.height);
if (options && options.aspectRatio && options.aspectRatio.keepAspectRatio) {
/** @type {?} */
let ratio = 0;
if (options.aspectRatio.forceMinDimensions) {
ratio = Math.max(width / imageData.width, height / imageData.height);
}
else {
ratio = Math.min(width / imageData.width, height / imageData.height);
}
width = Math.round(imageData.width * ratio);
height = Math.round(imageData.height * ratio);
}
/** @type {?} */
const destinationCanvas = document.createElement('canvas');
destinationCanvas.width = width;
destinationCanvas.height = height;
this.picaResize(file, originCanvas, destinationCanvas, options)
.catch((err) => resizedImage.error(err))
.then((imgResized) => {
resizedImage.next(imgResized);
});
});
};
img.src = window.URL.createObjectURL(file);
}
else {
resizedImage.error(NgxPicaErrorType.CANVAS_CONTEXT_IDENTIFIER_NOT_SUPPORTED);
}
return resizedImage.asObservable();
}
/**
* @param {?} files
* @param {?} sizeInMB
* @return {?}
*/
compressImages(files, sizeInMB) {
/** @type {?} */
const compressedImage = new Subject();
/** @type {?} */
const totalFiles = files.length;
if (totalFiles > 0) {
/** @type {?} */
const nextFile = new Subject();
/** @type {?} */
let index = 0;
/** @type {?} */
const subscription = nextFile.subscribe((file) => {
this.compressImage(file, sizeInMB).subscribe(imageCompressed => {
index++;
compressedImage.next(imageCompressed);
if (index < totalFiles) {
nextFile.next(files[index]);
}
else {
compressedImage.complete();
subscription.unsubscribe();
}
}, (err) => {
/** @type {?} */
const ngxPicaError = {
file: file,
err: err
};
compressedImage.error(ngxPicaError);
});
});
nextFile.next(files[index]);
}
else {
/** @type {?} */
const ngxPicaError = {
err: NgxPicaErrorType.NO_FILES_RECEIVED
};
compressedImage.error(ngxPicaError);
compressedImage.complete();
}
return compressedImage.asObservable();
}
/**
* @param {?} file
* @param {?} sizeInMB
* @return {?}
*/
compressImage(file, sizeInMB) {
/** @type {?} */
const compressedImage = new Subject();
/** @type {?} */
const originCanvas = document.createElement('canvas');
/** @type {?} */
const ctx = originCanvas.getContext('2d');
/** @type {?} */
const img = new Image();
if (ctx) {
img.onload = () => {
this._ngxPicaExifService.getExifOrientedImage(img).then(orientedImage => {
window.URL.revokeObjectURL(img.src);
originCanvas.width = orientedImage.width;
originCanvas.height = orientedImage.height;
ctx.drawImage(orientedImage, 0, 0);
if (this.bytesToMB(file.size) <= sizeInMB) {
this.picaResizer.toBlob(originCanvas, file.type, 1)
.catch((err) => compressedImage.error(err))
.then((blob) => {
/** @type {?} */
const imgCompressed = this.blobToFile(blob, file.name, file.type, new Date().getTime());
compressedImage.next(imgCompressed);
});
}
else {
this.getCompressedImage(originCanvas, file.type, 1, sizeInMB, 0)
.catch((err) => compressedImage.error(err))
.then((blob) => {
/** @type {?} */
const imgCompressed = this.blobToFile(blob, file.name, file.type, new Date().getTime());
compressedImage.next(imgCompressed);
});
}
});
};
img.src = window.URL.createObjectURL(file);
}
else {
compressedImage.error(NgxPicaErrorType.CANVAS_CONTEXT_IDENTIFIER_NOT_SUPPORTED);
}
return compressedImage.asObservable();
}
/**
* @param {?} canvas
* @param {?} type
* @param {?} quality
* @param {?} sizeInMB
* @param {?} step
* @return {?}
*/
getCompressedImage(canvas, type, quality, sizeInMB, step) {
return new Promise((resolve, reject) => {
this.picaResizer.toBlob(canvas, type, quality)
.catch((err) => reject(err))
.then((blob) => {
this.checkCompressedImageSize(canvas, blob, quality, sizeInMB, step)
.catch((err) => reject(err))
.then((compressedBlob) => {
resolve(compressedBlob);
});
});
});
}
/**
* @param {?} canvas
* @param {?} blob
* @param {?} quality
* @param {?} sizeInMB
* @param {?} step
* @return {?}
*/
checkCompressedImageSize(canvas, blob, quality, sizeInMB, step) {
return new Promise((resolve, reject) => {
if (step > this.MAX_STEPS) {
reject(NgxPicaErrorType.NOT_BE_ABLE_TO_COMPRESS_ENOUGH);
}
else if (this.bytesToMB(blob.size) < sizeInMB) {
resolve(blob);
}
else {
/** @type {?} */
const newQuality = quality - (quality * 0.1);
/** @type {?} */
const newStep = step + 1;
// recursively compression
resolve(this.getCompressedImage(canvas, blob.type, newQuality, sizeInMB, newStep));
}
});
}
/**
* @param {?} file
* @param {?} from
* @param {?} to
* @param {?} options
* @return {?}
*/
picaResize(file, from, to, options) {
return new Promise((resolve, reject) => {
this.picaResizer.resize(from, to, options)
.catch((err) => reject(err))
.then((resizedCanvas) => this.picaResizer.toBlob(resizedCanvas, file.type))
.then((blob) => {
/** @type {?} */
const fileResized = this.blobToFile(blob, file.name, file.type, new Date().getTime());
resolve(fileResized);
});
});
}
/**
* @param {?} blob
* @param {?} name
* @param {?} type
* @param {?} lastModified
* @return {?}
*/
blobToFile(blob, name, type, lastModified) {
/** @type {?} */
let file = /** @type {?} */ (new Blob([blob], { type: type }));
file.name = name;
file.lastModifiedDate = lastModified;
return /** @type {?} */ (file);
}
/**
* @param {?} bytes
* @return {?}
*/
bytesToMB(bytes) {
return bytes / 1048576;
}
}
NgxPicaService.decorators = [
{ type: Injectable }
];
/** @nocollapse */
NgxPicaService.ctorParameters = () => [
{ type: NgxPicaExifService }
];
if (false) {
/** @type {?} */
NgxPicaService.prototype.picaResizer;
/** @type {?} */
NgxPicaService.prototype.MAX_STEPS;
/** @type {?} */
NgxPicaService.prototype._ngxPicaExifService;
}
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{Injectable} from '@angular/core';\nimport {Subject, Observable, Subscription} from 'rxjs';\nimport {NgxPicaErrorInterface, NgxPicaErrorType} from './ngx-pica-error.interface';\nimport {NgxPicaResizeOptionsInterface} from './ngx-pica-resize-options.interface';\nimport {NgxPicaExifService} from './ngx-pica-exif.service';\nimport Pica from 'pica';\n\n\ndeclare let window: any;\n\n@Injectable()\nexport class NgxPicaService {\n    private picaResizer = new Pica();\n    private MAX_STEPS = 20;\n\n    constructor(private _ngxPicaExifService: NgxPicaExifService) {\n        if (!this.picaResizer || !this.picaResizer.resize) {\n            this.picaResizer = new window.Pica();\n        }\n    }\n\n    public resizeImages(files: File[], width: number, height: number, options?: NgxPicaResizeOptionsInterface): Observable<File> {\n        const resizedImage: Subject<File> = new Subject();\n        const totalFiles: number = files.length;\n\n        if (totalFiles > 0) {\n            const nextFile: Subject<File> = new Subject();\n            let index = 0;\n\n            const subscription: Subscription = nextFile.subscribe((file: File) => {\n                this.resizeImage(file, width, height, options).subscribe(imageResized => {\n                    index++;\n                    resizedImage.next(imageResized);\n\n                    if (index < totalFiles) {\n                        nextFile.next(files[index]);\n\n                    } else {\n                        resizedImage.complete();\n                        subscription.unsubscribe();\n                    }\n                }, (err) => {\n                    const ngxPicaError: NgxPicaErrorInterface = {\n                        file: file,\n                        err: err\n                    };\n\n                    resizedImage.error(ngxPicaError);\n                });\n            });\n\n            nextFile.next(files[index]);\n        } else {\n            const ngxPicaError: NgxPicaErrorInterface = {\n                err: NgxPicaErrorType.NO_FILES_RECEIVED\n            };\n\n            resizedImage.error(ngxPicaError);\n            resizedImage.complete();\n        }\n\n        return resizedImage.asObservable();\n    }\n\n    public resizeImage(file: File, width: number, height: number, options?: NgxPicaResizeOptionsInterface): Observable<File> {\n        const resizedImage: Subject<File> = new Subject();\n        const originCanvas: HTMLCanvasElement = document.createElement('canvas');\n        const ctx = originCanvas.getContext('2d');\n        const img = new Image();\n\n        if (ctx) {\n            img.onload = () => {\n                this._ngxPicaExifService.getExifOrientedImage(img).then(orientedImage => {\n                    window.URL.revokeObjectURL(img.src);\n                    originCanvas.width = orientedImage.width;\n                    originCanvas.height = orientedImage.height;\n\n                    ctx.drawImage(orientedImage, 0, 0);\n\n                    const imageData = ctx.getImageData(0, 0, orientedImage.width, orientedImage.height);\n                    if (options && options.aspectRatio && options.aspectRatio.keepAspectRatio) {\n                        let ratio = 0;\n\n                        if (options.aspectRatio.forceMinDimensions) {\n                            ratio = Math.max(width / imageData.width, height / imageData.height);\n                        } else {\n                            ratio = Math.min(width / imageData.width, height / imageData.height);\n                        }\n\n                        width = Math.round(imageData.width * ratio);\n                        height = Math.round(imageData.height * ratio);\n                    }\n\n                    const destinationCanvas: HTMLCanvasElement = document.createElement('canvas');\n                    destinationCanvas.width = width;\n                    destinationCanvas.height = height;\n\n                    this.picaResize(file, originCanvas, destinationCanvas, options)\n                        .catch((err) => resizedImage.error(err))\n                        .then((imgResized: File) => {\n                            resizedImage.next(imgResized);\n                        });\n                });\n            };\n\n            img.src = window.URL.createObjectURL(file);\n        } else {\n            resizedImage.error(NgxPicaErrorType.CANVAS_CONTEXT_IDENTIFIER_NOT_SUPPORTED);\n        }\n\n        return resizedImage.asObservable();\n    }\n\n    public compressImages(files: File[], sizeInMB: number): Observable<File> {\n        const compressedImage: Subject<File> = new Subject();\n        const totalFiles: number = files.length;\n\n        if (totalFiles > 0) {\n            const nextFile: Subject<File> = new Subject();\n            let index = 0;\n\n            const subscription: Subscription = nextFile.subscribe((file: File) => {\n                this.compressImage(file, sizeInMB).subscribe(imageCompressed => {\n                    index++;\n                    compressedImage.next(imageCompressed);\n\n                    if (index < totalFiles) {\n                        nextFile.next(files[index]);\n\n                    } else {\n                        compressedImage.complete();\n                        subscription.unsubscribe();\n                    }\n                }, (err) => {\n                    const ngxPicaError: NgxPicaErrorInterface = {\n                        file: file,\n                        err: err\n                    };\n\n                    compressedImage.error(ngxPicaError);\n                });\n            });\n\n            nextFile.next(files[index]);\n        } else {\n            const ngxPicaError: NgxPicaErrorInterface = {\n                err: NgxPicaErrorType.NO_FILES_RECEIVED\n            };\n\n            compressedImage.error(ngxPicaError);\n            compressedImage.complete();\n        }\n\n        return compressedImage.asObservable();\n    }\n\n    public compressImage(file: File, sizeInMB: number): Observable<File> {\n        const compressedImage: Subject<File> = new Subject();\n\n        const originCanvas: HTMLCanvasElement = document.createElement('canvas');\n        const ctx = originCanvas.getContext('2d');\n        const img = new Image();\n\n        if (ctx) {\n            img.onload = () => {\n                this._ngxPicaExifService.getExifOrientedImage(img).then(orientedImage => {\n                    window.URL.revokeObjectURL(img.src);\n                    originCanvas.width = orientedImage.width;\n                    originCanvas.height = orientedImage.height;\n\n                    ctx.drawImage(orientedImage, 0, 0);\n\n                    if (this.bytesToMB(file.size) <= sizeInMB) {\n                        this.picaResizer.toBlob(originCanvas, file.type, 1)\n                            .catch((err) => compressedImage.error(err))\n                            .then((blob: Blob) => {\n                                const imgCompressed: File = this.blobToFile(blob, file.name, file.type, new Date().getTime());\n                                compressedImage.next(imgCompressed);\n                            });\n                    } else {\n                        this.getCompressedImage(originCanvas, file.type, 1, sizeInMB, 0)\n                            .catch((err) => compressedImage.error(err))\n                            .then((blob: Blob) => {\n                                const imgCompressed: File = this.blobToFile(blob, file.name, file.type, new Date().getTime());\n\n                                compressedImage.next(imgCompressed);\n                            });\n                    }\n                });\n            };\n\n            img.src = window.URL.createObjectURL(file);\n        } else {\n            compressedImage.error(NgxPicaErrorType.CANVAS_CONTEXT_IDENTIFIER_NOT_SUPPORTED);\n        }\n\n        return compressedImage.asObservable();\n    }\n\n    private getCompressedImage(canvas: HTMLCanvasElement, type: string, quality: number, sizeInMB: number, step: number): Promise<Blob> {\n        return new Promise<Blob>((resolve, reject) => {\n            this.picaResizer.toBlob(canvas, type, quality)\n                .catch((err) => reject(err))\n                .then((blob: Blob) => {\n                    this.checkCompressedImageSize(canvas, blob, quality, sizeInMB, step)\n                        .catch((err) => reject(err))\n                        .then((compressedBlob: Blob) => {\n                                resolve(compressedBlob);\n                            }\n                        );\n                });\n        });\n    }\n\n    private checkCompressedImageSize(\n        canvas: HTMLCanvasElement,\n        blob: Blob,\n        quality: number,\n        sizeInMB: number,\n        step: number\n    ): Promise<Blob> {\n        return new Promise<Blob>((resolve,\n            reject) => {\n\n            if (step > this.MAX_STEPS) {\n                reject(NgxPicaErrorType.NOT_BE_ABLE_TO_COMPRESS_ENOUGH);\n            } else if (this.bytesToMB(blob.size) < sizeInMB) {\n                resolve(blob);\n            } else {\n                const newQuality: number = quality - (quality * 0.1);\n                const newStep: number = step + 1;\n\n                // recursively compression\n                resolve(this.getCompressedImage(canvas, blob.type, newQuality, sizeInMB, newStep));\n            }\n        });\n    }\n\n    private picaResize(file: File, from: HTMLCanvasElement, to: HTMLCanvasElement, options: any): Promise<File> {\n        return new Promise<File>((resolve, reject) => {\n            this.picaResizer.resize(from, to, options)\n                .catch((err) => reject(err))\n                .then((resizedCanvas: HTMLCanvasElement) => this.picaResizer.toBlob(resizedCanvas, file.type))\n                .then((blob: Blob) => {\n                    const fileResized: File = this.blobToFile(blob, file.name, file.type, new Date().getTime());\n                    resolve(fileResized);\n                });\n        });\n    }\n\n    private blobToFile(blob: Blob, name: string, type: string, lastModified: number): File {\n        // return new File([blob], name, {type: type, lastModified: lastModified});\n        let file = new Blob([blob], {type : type}) as any;\n        file.name = name;\n        file.lastModifiedDate = lastModified;\n        return file as File\n    }\n\n    private bytesToMB(bytes: number) {\n        return bytes / 1048576;\n    }\n}\n"]}