Pdfx Pinch - Android is lagging when zooming on large pdf's - Rendering delay mechanism

InspectlyMads commented 1 year ago

Describe the bug

Using PdfViewPinch with a large pdf When repeatedly zooming in on the PDF, the document's performance becomes noticeably sluggish, primarily due to the frequent re-rendering process. Each zoom action triggers a re-rendering that takes approximately half a second to complete. This lag is particularly pronounced when users attempt to perform rapid successive zooms.

Is it possible to introduce a rendering delay mechanism to address this issue? This delay would be especially beneficial in scenarios where users perform multiple zoom actions in quick succession, allowing the system to optimize rendering and improve the overall user experience.

To Reproduce Steps to reproduce the behavior:

Go to PdfViewPinch
Add a large pdf
Zoom twice just after eachother
Notice the lag on the android viewer

Expected behavior After the first zoom i expect a delay before rendering for the possibility of another zoom

Screenshots I can make a screencast if needed

Smartphone (please complete the following information):

Device: Pixel 5 & and emulator

JgomesAT commented 11 months ago

In a FLutter web the zoom and the scroll with PDFs with many pages has a similar behavior

SEGVeenstra commented 10 months ago

I think this is related to the bug I just created. https://github.com/ScerIO/packages.flutter/issues/468 I think it's blocking the UI thread on Android, while it works perfectly on iOS. That would probably explain the behavior on Flutter Web as well, as I believe you cannot do multi-threading on web.

ScerIO / packages.flutter

Pdfx Pinch - Android is lagging when zooming on large pdf's - Rendering delay mechanism #434