Given that this function is only ever used in `src/core/` code, let's avoid a little bit of dead code in the *built* `pdf.mjs` file.
Also, place the `AnnotationPrefix` and `AnnotationEditorPrefix` constants together in `src/shared/util.js` since that should aid readability.
Note that `Ref`s and `Name`s are cached globally[1], since that helps reduce object creation (a lot) during parsing.
That cache will be cleared after a period of inactivity in the viewer[2], which is why those primitives cannot *safely* be compared with just `===`/`!==` and also (partially) why abstractions such as `RefSet`/`RefSetCache` are necessary.
Currently `deepCompare` doesn't handle `Ref`s and `Name`s correctly, which may lead to future *intermittent* bugs in any code using the `deepCompare` helper function.
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[1] This applies to `Cmd` as well, however that doesn't matter in the context of this patch.
[2] Currently, and for more than a decade, set to 30 seconds.
This is a left-over from very old code, which pre-dates the introduction of the `PDFDocumentLoadingTask` and it's nothing more than an alias for its `destroy` method.
Given that `PDFDocumentProxy` already provides a way to access the underlying `PDFDocumentLoadingTask` instance, it shouldn't be necessary to have an alias for one of its methods.
*Please note:* For any existing code relying on the removed method, updating it should be as simple as replacing `pdfDocument.destroy()` with `pdfDocument.loadingTask.destroy()`.
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[1] If the `PDFDocumentProxy` class was added today, there's no chance that it'd include a `destroy` method.
This is a left-over from very old code[1], before there were a lot of `getDocument` options and when most of the library configuration was done via the (since removed) `PDFJS` global.
Given all the functionality added through the years, which require configuration[2], in practice it's now unlikely that calling `getDocument` without additional options will work except for the most trivial PDFs.
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[1] If the `getDocument` function was added today, there's no chance that it'd support anything other than a parameter object.
[2] Note things such as CMaps, standard fonts, wasm-based image decoders, and ICC-based colour spaces.
The delay between chunks when testing streaming is necessary to avoid the entire PDF document arriving all at once, since that would render those unit-tests somewhat pointless.
However, the delay is unnecessarily large which causes these unit-tests to be slower than necessary.
Also, update the range unit-tests to check the expected number of fetches *exactly* since those values are not supposed to vary.
The find controller tests consistently show up in the list of slowest
tests reported by Jasmine. Profiling shows that most of the time is
spent waiting for the find results to arrive, even though the find
command itself is quite fast.
It turns out that the slowdown occurs between receiving the `find` event
and actually triggering the search. The find controller has a hardcoded
delay of 250 milliseconds built in, which was introduced for viewer
performance many years ago because otherwise every keystroke would
trigger a search even though the user's query was not complete yet.
For the unit tests we don't need this delay because, contrary to the
viewer use case, we don't have to account for user interaction and
instead dispatch complete `find` events on the event bus ourselves.
However, since the unit tests were introduced well over a year after
the delay was introduced, due to an oversight it was never made
configurable so we could skip it for the unit tests.
This commit fixes the issue, which locally results in the runtime of
`npx gulp unittest --noChrome` dropping from 39.991 seconds before this
patch to 29.116 seconds afterwards, which is a 27% speedup.
In a previous commit the time-based checks, which were based on
statistics provided by the `pdfBug: true` flag, got replaced by
test-only property checks that don't use said statistics anymore.
Fixes b01eeaf8.
This commit fixes a number of missing cleanup steps in the unit tests
that kept state alive for longer than necessary:
- the loading tasks were not all being destroyed;
- the find controllers were not being reset;
- the state set in `beforeAll`/`beforeEach` was not all being nulled in
the correspoding `afterAll`/`afterEach` blocks.
Combined this resulted in a steady increase in memory usage of the test
process as the tests ran, climbing up to ~1.5 GB. After this patch the
memory usage remains stable at ~800 MB.
When pages carry explicit pageIndices (e.g. after a delete),
resolve insertAfter against that layout instead of the empty
base sequence. Also reject partial pageIndices combined with
insertAfter, which would race against the extraction's auto-fill.
The alpha feature is available in Firefox nightly (with the pref `dom.forms.html_color_picker.enabled` set to `true`).
It's available in Safari but not in Chrome.
*Note:* This is similar to PR 19525, which did the same thing for the OpenJPEG decoder.
The advantages of doing this are:
- The same JBig2 decoder is used regardless of WASM being supported or not, which means consistent rendering.
- The old `Jbig2Image` implementation has various bugs and missing features.
- Less code that needs to be maintained in the PDF.js project, since both the CCITT and the JBig2 decoder is replaced.
The disadvantage of doing this is:
- Slightly larger bundle size, however the effect is limited since a fair amount of PDF.js code can be removed. For the `gulp mozcentral` target the size increase is approximately 54 kilo-bytes (which is small compared to the 452 kilo-bytes for the JS version of the OpenJPEG decoder).
Rather than relying on the time it takes to parse/render the pages, which leads to intermittent failures, add a test-only property and use it to check if the "CopyLocalImage" code-path was exercised.
This unit test failed consistently in Firefox both locally and on GitHub
Actions (but not in Chrome or on the bots), which suggests a timing issue.
Since all other unit tests that rely on `commonObjs` actually render the
page, most likely to make sure that `commonObjs` is fully populated at
the time of the check, this commit mirrors that approach to this test,
which indeed fixes the issue.
After the previous patches the `string32` helper function is now only used in the `FontLoader.prototype._prepareFontLoadEvent` method, which is stubbed out in the Firefox PDF Viewer, hence move it there instead to avoid bundling dead code.
1. Record `fill` dependencies even if we early return due to `isPatternFill``
2. Isolate the `drawPattern` inner `executeOperationList` in a
`CanvasNestedDependencyTracker` so that it does not consume pending
dependencies from the outer list.
Currently the `CFFCompiler.prototype.compile` implementation seem a bit inefficient, since the data is stored in a plain Array that needs to grow (a lot) during compilation. Additionally, adding a lot of entries isn't very efficient either and requires special handling of the "too many elements" case.
Some of the "helper" methods that use TypedArrays internally currently need to convert their return data to plain Arrays, via the `compileTypedArray` method, which adds even more intermediate allocations.
Note also that the `OpenTypeFileBuilder` has a special-case for writing plain Array data, which is only needed because of how the CFF compilation is implemented.
To improve this situation the `CFFCompiler.prototype.compile` method is re-factored to store its data in a TypedArray, whose initial size is estimated from the "raw" file size.
This removes the need for most intermediate allocations, and it also handles adding of "many elements" more efficiently.
One drawback of the current implementation is that the GPU device can be
unavailable at the time of the first pattern fill, which causes the
GPU-accelerated canvas to be move on the main thread because of putImageData.
Most of the shading patterns stuff will be moved to the GPU and in order
to avoid creating some useless data we've to know if the GPU is available or not.
So in this patch we create the GPU device during the worker initialization
and pass a flag to the evaluator to know if the GPU is available or not.
