Picsur/frontend/src/app/components/picsur-img/picsur-img.component.ts

126 lines
3.4 KiB
TypeScript

import {
ChangeDetectionStrategy,
ChangeDetectorRef,
Component,
ElementRef,
Input,
OnChanges,
ViewChild,
} from '@angular/core';
import { FileType, ImageFileType } from 'picsur-shared/dist/dto/mimes.dto';
import { AsyncFailable, HasFailed } from 'picsur-shared/dist/types/failable';
import { URLRegex } from 'picsur-shared/dist/util/common-regex';
import { ParseMime2FileType } from 'picsur-shared/dist/util/parse-mime';
import { ApiService } from '../../services/api/api.service';
import { Logger } from '../../services/logger/logger.service';
import { QoiWorkerService } from '../../workers/qoi-worker.service';
enum PicsurImgState {
Init = 'init',
Loading = 'loading',
Canvas = 'canvas',
Image = 'image',
Error = 'error',
}
@Component({
selector: 'picsur-img',
templateUrl: './picsur-img.component.html',
styleUrls: ['./picsur-img.component.scss'],
changeDetection: ChangeDetectionStrategy.OnPush,
})
export class PicsurImgComponent implements OnChanges {
private readonly logger = new Logger(PicsurImgComponent.name);
@ViewChild('targetcanvas') private canvas: ElementRef<HTMLCanvasElement>;
@ViewChild('targetimg') private img: ElementRef<HTMLImageElement>;
private isInView = false;
@Input('src') imageURL: string | undefined;
public state: PicsurImgState = PicsurImgState.Init;
constructor(
private readonly qoiWorker: QoiWorkerService,
private readonly apiService: ApiService,
private readonly changeDetector: ChangeDetectorRef,
) {}
ngOnChanges(): void {
if (this.isInView) this.reload();
}
private reload() {
const url = this.imageURL ?? '';
if (!URLRegex.test(url)) {
this.state = PicsurImgState.Loading;
this.changeDetector.markForCheck();
return;
}
this.update(url)
.then((result) => {
if (HasFailed(result)) {
this.state = PicsurImgState.Error;
this.logger.error(result.getReason());
this.changeDetector.markForCheck();
}
})
.catch(this.logger.error);
}
private async update(url: string): AsyncFailable<void> {
const filetype = await this.getFileType(url);
if (HasFailed(filetype)) return filetype;
if (filetype.identifier === ImageFileType.QOI) {
const result = await this.qoiWorker.decode(url);
if (HasFailed(result)) return result;
const canvas = this.canvas.nativeElement;
canvas.height = result.height;
canvas.width = result.width;
canvas.getContext('2d')?.putImageData(result.data, 0, 0);
this.state = PicsurImgState.Canvas;
} else {
const result = await this.apiService.getBuffer(url).result;
if (HasFailed(result)) return result;
const img = this.img.nativeElement;
const blob = new Blob([result.buffer]);
img.src = URL.createObjectURL(blob);
this.state = PicsurImgState.Image;
}
this.changeDetector.markForCheck();
}
private async getFileType(url: string): AsyncFailable<FileType> {
const response = await this.apiService.head(url).result;
if (HasFailed(response)) {
return response;
}
const mimeHeader = response['content-type'] ?? '';
const mime = mimeHeader.split(';')[0];
return ParseMime2FileType(mime);
}
onInview() {
this.isInView = true;
if (this.state === PicsurImgState.Init) {
this.state = PicsurImgState.Loading;
this.reload();
}
}
onOutview() {
this.isInView = false;
}
}