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Actually transfer eligible ImageMask data, rather than always copying it

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By transfering `ArrayBuffer`s you can avoid having two copies of the same data, i.e. one copy on each of the worker/main-thread, for data that's used only *once* on the worker-thread.

Note how the code in [`PDFImage.createMask`](80135378ca/src/core/image.js (L284-L285)) goes to great lengths to actually enable tranfering of the image data. However in [`PartialEvaluator.buildPaintImageXObject`](80135378ca/src/core/evaluator.js (L336)) the `cached` property is always set to `true`, which disqualifies the image data from being transfered; see [`getTransfers`](80135378ca/src/core/operator_list.js (L552-L554)).

For most ImageMask data this patch won't matter, since images found in the `/Resources -> /XObject` dictionary will always be indexed by name. However for *inline* images which contains ImageMask data, where only "small" images are cached (in both `parser.js` and `evaluator.js`), the current code will result in some unnecessary memory usage.
This commit is contained in:
Jonas Jenwald 2019-03-16 12:09:14 +01:00
parent 80135378ca
commit 7273795eb6
1 changed files with 2 additions and 1 deletions
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src/core/evaluator.js
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@ -333,8 +333,9 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
imageIsFromDecodeStream: image instanceof DecodeStream,
inverseDecode: (!!decode && decode[0] > 0),
});
imgData.cached = true;
imgData.cached = !!cacheKey;
args = [imgData];
operatorList.addOp(OPS.paintImageMaskXObject, args);
if (cacheKey) {
imageCache[cacheKey] = {