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[api-minor] Make isOffscreenCanvasSupported configurable via the API (issue 14952)

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This patch first of all makes `isOffscreenCanvasSupported` configurable, defaulting to `true` in browsers and `false` in Node.js environments, with a new `getDocument` parameter. While you normally want to use this, in order to improve performance, it should still be possible for users to control it (similar to e.g. `isEvalSupported`).

The specific problem, as reported in issue 14952, is that the SVG back-end doesn't support the new ImageMask data-format that's introduced in PR 14754. In particular:
 - When the SVG back-end is used in Node.js environments, this patch will "just work" without the user needing to make any code changes.
 - If the SVG back-end is used in browsers, this patch will require that `isOffscreenCanvasSupported: false` is added to the `getDocument`-call.
This commit is contained in:
Jonas Jenwald 2022-10-06 22:05:32 +02:00
parent 7d5f7a517c
commit 1ea4c4b519
6 changed files with 37 additions and 5 deletions
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8
src/display/api.js
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@ -189,6 +189,10 @@ function setPDFNetworkStreamFactory(pdfNetworkStreamFactory) {
* @property {boolean} [isEvalSupported] - Determines if we can evaluate strings
* as JavaScript. Primarily used to improve performance of font rendering, and
* when parsing PDF functions. The default value is `true`.
* @property {boolean} [isOffscreenCanvasSupported] - Determines if we can use
* `OffscreenCanvas` in the worker. Primarily used to improve performance of
* image conversion/rendering.
* The default value is `true` in web environments and `false` in Node.js.
* @property {boolean} [disableFontFace] - By default fonts are converted to
* OpenType fonts and loaded via the Font Loading API or `@font-face` rules.
* If disabled, fonts will be rendered using a built-in font renderer that
@ -365,6 +369,9 @@ function getDocument(src) {
if (typeof params.isEvalSupported !== "boolean") {
params.isEvalSupported = true;
}
if (typeof params.isOffscreenCanvasSupported !== "boolean") {
params.isOffscreenCanvasSupported = !isNodeJS;
}
if (typeof params.disableFontFace !== "boolean") {
params.disableFontFace = isNodeJS;
}
@ -516,6 +523,7 @@ async function _fetchDocument(worker, source, pdfDataRangeTransport, docId) {
docBaseUrl: source.docBaseUrl,
ignoreErrors: source.ignoreErrors,
isEvalSupported: source.isEvalSupported,
isOffscreenCanvasSupported: source.isOffscreenCanvasSupported,
fontExtraProperties: source.fontExtraProperties,
enableXfa: source.enableXfa,
useSystemFonts: source.useSystemFonts,