Toggle the layers visibility.

[Kathiravan E]

Hi All,

I want to toggle the visibility of the PDF layers. But i could not see any APIs related to retrieving the layer/ layerdatas from Pdfium library.

In the below patagames forum link, they provided some suggestion to toggle the layer's visibility,

http://forum.patagames.com/posts/t325-How-to-select-PDF-layers-to-display

But i don't know how to get the layer details from Pdfium library. Can you please provide any suggestion to achieve the layer's toggle operation.

Regards,
Kathiravan E

[Dan Sinclair]

I don't think PDFium has any logic to deal with layers at this point. You'd need to add a new public/ API and then hook it up to achieve what you're looking for. Feel free to file a bug at https://crbug.com/pdfium and we can add it to the back log of needed APIs.

dan

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[Jean Haney]

We have a commercial alternative to PDFium which supports discreet layers based on different criteria (color, spot color, line weights, PDF layers), . Please contact us if you want more information.

jean

Visual Integrity

[Lei Zhang]

We certainly have existing bugs [1] [2] filed for interacting with
OCGs. If those do not cover your needs, file more bugs and/or
contribute code.

[1] https://bugs.chromium.org/p/pdfium/issues/detail?id=709
[2] https://bugs.chromium.org/p/pdfium/issues/detail?id=1136

> https://groups.google.com/d/msgid/pdfium/CAMYH%3DOi%3DoREZyf_-vt9rqQffD_JOh2uF6kb8Kau2HiiNA-8iHw%40mail.gmail.com.