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XFA - Add the possibily to layout and measure text

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- some containers doesn't always have their 2 dimensions and those dimensions re based on contents;
  - so in order to measure text, we must get the glyph widths (for the xfa fonts) before starting the layout;
  - implement a word-wrap algorithm;
  - handle font change during text layout.
This commit is contained in:
Calixte Denizet 2021-06-14 19:16:42 +02:00
parent 335d4cb2fc
commit 8eeb7ab4a3
12 changed files with 416 additions and 91 deletions
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20
src/core/worker.js
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@ -187,13 +187,8 @@ class WorkerMessageHandler {
await pdfManager.ensureDoc("checkFirstPage");
}
const [numPages, fingerprint, htmlForXfa] = await Promise.all([
pdfManager.ensureDoc("numPages"),
pdfManager.ensureDoc("fingerprint"),
pdfManager.ensureDoc("htmlForXfa"),
]);
if (htmlForXfa) {
const isPureXfa = await pdfManager.ensureDoc("isPureXfa");
if (isPureXfa) {
const task = new WorkerTask("loadXfaFonts");
startWorkerTask(task);
await pdfManager
@ -203,6 +198,17 @@ class WorkerMessageHandler {
})
.then(() => finishWorkerTask(task));
}
const [numPages, fingerprint] = await Promise.all([
pdfManager.ensureDoc("numPages"),
pdfManager.ensureDoc("fingerprint"),
]);
// Get htmlForXfa after numPages to avoid to create HTML twice.
const htmlForXfa = isPureXfa
? await pdfManager.ensureDoc("htmlForXfa")
: null;
return { numPages, fingerprint, htmlForXfa };
}