[Feature Request / Improvement Request ] Faster way of converting a Picture to an Image

[Yusuf-Uluc]

Use case

I started creating an app for writing down notes on your tablet using a pen. For this, I used a CustomPaint (with canvas.drawLine()) in combination with a GestureDetector. After some Lines, the app gets extreme frame drops and is unusable, so I converted the lines into images every few hundred offsets.
Here some of the relevant code:

ui.PictureRecorder recorder = ui.PictureRecorder();
// some code inbetween...
ui.Picture picture = recorder.endRecording();
ui.Image newImage = await picture.toImage(
         ....
      );

Now the problem with this method is that I am getting a really strong frame drop every time toImage() gets called.

Recording of the issue in Release Mode:

Proposal

In the Flutter docs, there is mentioned that 'This is a slow operation that is performed on a background thread.'.
But I wanted to request a faster and more efficient way of converting a Picture to an Image.

[chinmaygarde]

Instead of multiple drawLine calls, have you considered the effects of expressing the polyline as a single path and then using a single drawPath call? See #23461 (comment) for details on a similar issue.

[chinmaygarde]

Closing this a duplicate of the linked issue.

[github-actions]

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