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Fix and attach image annotation renderer

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This commit is contained in:
Martynas Bagdonas 2021-02-24 16:33:06 +02:00 • committed by Dan Stillman
parent 3e4ad18b2a
commit 83109fc076
3 changed files with 84 additions and 33 deletions
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49
resource/pdf-renderer/renderer.js
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@ -31,7 +31,22 @@ function errObject(err) {
return JSON.parse(JSON.stringify(err, Object.getOwnPropertyNames(err)));
}
async function renderAnnotations(buf, annotations, send) {
let lastPromiseID = 0;
let waitingPromises = {};
async function query(action, data, transfer) {
return new Promise((resolve, reject) => {
lastPromiseID++;
waitingPromises[lastPromiseID] = { resolve, reject };
parent.postMessage({
id: lastPromiseID,
action,
data
}, parent.origin, transfer);
});
}
async function renderAnnotations(buf, annotations) {
let num = 0;
let pdfDocument = await window.pdfjsLib.getDocument({ data: buf }).promise;
let pages = new Map();
@ -54,10 +69,9 @@ async function renderAnnotations(buf, annotations, send) {
newCanvas.height = height;
let newCanvasContext = newCanvas.getContext('2d');
newCanvasContext.drawImage(canvas, left, top, width, height, 0, 0, width, height);
newCanvas.toBlob(async (blob) => {
let image = await new Response(blob).arrayBuffer();
send({ id: annotation.id, image });
}, 'image/png');
let blob = await new Promise(resolve => newCanvas.toBlob(resolve, 'image/png'));
let image = await new Response(blob).arrayBuffer();
await query('renderedAnnotation', { annotation: { id: annotation.id, image } }, [image]);
num++;
}
}
@ -91,16 +105,25 @@ window.addEventListener('message', async (event) => {
return;
}
let message = event.data;
if (message.responseID) {
let { resolve, reject } = waitingPromises[message.responseID];
delete waitingPromises[message.responseID];
if (message.data) {
resolve(message.data);
}
else {
let err = new Error(message.error.message);
Object.assign(err, message.error);
reject(err);
}
return;
}
if (message.action === 'renderAnnotations') {
try {
let { buf, annotations } = message.data;
let num = await renderAnnotations(
buf,
annotations,
(annotation) => {
parent.postMessage({ action: 'renderedAnnotation', data: { annotation } }, parent.origin, [annotation.image]);
}
);
let num = await renderAnnotations(buf, annotations);
parent.postMessage({ responseID: message.id, data: num }, parent.origin);
}
catch (e) {
@ -114,5 +137,5 @@ window.addEventListener('message', async (event) => {
});
setTimeout(() => {
parent.postMessage({ action: 'initialized' }, parent.origin);
query('initialized', {});
}, 100);