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Add (basic) support for transfer functions to Images (issue 6931, bug 1149713) #12219

Merged
merged 2 commits into from
Aug 17, 2020
Merged

Add (basic) support for transfer functions to Images (issue 6931, bug 1149713) #12219

merged 2 commits into from
Aug 17, 2020

Commits on Aug 17, 2020

  1. Don't cache /ExtGState entries that contain fonts (PR 12087 follow-up) 

    I completely overlooked the fact that `PartialEvaluator.handleSetFont` also updates the current `state`, which means that currently we're not actually handling font data correctly for cached /ExtGState data. (Thankfully, using /ExtGState to set a font is somewhat rare in practice.)
    @Snuffleupagus
    Snuffleupagus committed Aug 17, 2020
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  2. Add (basic) support for transfer functions to Images (issue 6931, bug… 

    … 1149713)

This is *similar* to the existing transfer function support for SMasks, but extended to simple image data.
Please note that the extra amount of data now being sent to the worker-thread, for affected /ExtGState entries, is limited to *at most* 4 `Uint8Array`s each with a length of 256 elements.

Refer to https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/PDF32000_2008.pdf#G9.1658137 for additional details.
    @Snuffleupagus
    Snuffleupagus committed Aug 17, 2020
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