90 lines
3.2 KiB
JavaScript
Generated
90 lines
3.2 KiB
JavaScript
Generated
/*
|
|
* Copyright 2023 Google LLC
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|
|
*/
|
|
import initModule from '../build/libapi.mjs';
|
|
// A helper that allows to distinguish critical errors from library errors.
|
|
export function rethrowIfCritical(err) {
|
|
// If it's precisely Error, it's a custom error; anything else - SyntaxError,
|
|
// WebAssembly.RuntimeError, TypeError, etc. - is treated as critical here.
|
|
if (err?.constructor !== Error) {
|
|
throw err;
|
|
}
|
|
}
|
|
const INTERFACE_CLASS = 6; // PTP
|
|
const INTERFACE_SUBCLASS = 1; // MTP
|
|
let ModulePromise;
|
|
export class Camera {
|
|
#queue = Promise.resolve();
|
|
#context = null;
|
|
static async showPicker() {
|
|
// @ts-ignore
|
|
await navigator.usb.requestDevice({
|
|
filters: [
|
|
{
|
|
classCode: INTERFACE_CLASS,
|
|
subclassCode: INTERFACE_SUBCLASS
|
|
}
|
|
]
|
|
});
|
|
}
|
|
async connect() {
|
|
if (!ModulePromise) {
|
|
ModulePromise = initModule();
|
|
}
|
|
let Module = await ModulePromise;
|
|
this.#context = await new Module.Context();
|
|
}
|
|
async #schedule(op) {
|
|
let res = this.#queue.then(() => op(this.#context));
|
|
this.#queue = res.catch(rethrowIfCritical);
|
|
return res;
|
|
}
|
|
async disconnect() {
|
|
if (this.#context && !this.#context.isDeleted()) {
|
|
this.#context.delete();
|
|
}
|
|
}
|
|
async getConfig() {
|
|
return this.#schedule(context => context.configToJS());
|
|
}
|
|
async getSupportedOps() {
|
|
if (this.#context) {
|
|
return await this.#context.supportedOps();
|
|
}
|
|
throw new Error('You need to connect to the camera first');
|
|
}
|
|
async setConfigValue(name, value) {
|
|
let uiTimeout;
|
|
await this.#schedule(context => {
|
|
// This is terrible, yes... but some configs return too quickly before they're actually updated.
|
|
// We want to wait some time before updating the UI in that case, but not block subsequent ops.
|
|
uiTimeout = new Promise(resolve => setTimeout(resolve, 800));
|
|
return context.setConfigValue(name, value);
|
|
});
|
|
await uiTimeout;
|
|
}
|
|
async capturePreviewAsBlob() {
|
|
return this.#schedule(context => context.capturePreviewAsBlob());
|
|
}
|
|
async captureImageAsFile() {
|
|
return this.#schedule(context => context.captureImageAsFile());
|
|
}
|
|
async consumeEvents() {
|
|
return this.#schedule(context => context.consumeEvents());
|
|
}
|
|
}
|