Separate layout and drawing in order to measure and improve performance

[cmeyer]

Notes from 2023-04-01:

Here are some ideas about the drawing architecture to address the slow resizing behavior on Windows.

• separate layout into something that is separate from the canvas item.
• separate repainting into something that is separate from the canvas item.
• automatically handle layering during repainting. layering is necessary when repainting requires a background task and caching, i.e. drawing line plot or images.
• retained drawing model?
• the canvas item can maintain a current layout and repaint model.
• copying the layout/repaint models should be O(1) if possible; this makes it fast to launch threads for layout and repaint.
• modifying the layout/repaint models may be O(n) or worse; this is only to facilitate O(1) above.
• make measurable functions to do layout, drawing prep, and drawing to screen
• write an animation for measuring performance using underlying measurable functions

[cmeyer]

closed with nionui 9.0