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Description
Describe the bug
At least on big maps (1024x1024 tiles), painting over existing tiles with the stamp brush results in very poor performance (read: unusable).
To Reproduce
- Create a 1024x1024 maps, 100x100px tiles
- Use 2 tilesets of 100 separate tiles each. Each tileset has its own image ("Collection of images")
- Select all the 100 tiles of tileset 1. Fill the entire map with the bucket fill tool in random mode so that you have different tiles every where.
- Select one tile of tileset 2. Select the stamp brush tool. On the same layer, attempt to paint over existing tiles by clicking and dragging the mouse.
- Notice that performance is so bad it's unusable. Everything hangs for seconds on each mouse drag. The longer the drag, the longer the hang.
Performance is good when you clear a small patch before painting (with the rectangle select tool and hitting delete). So it seems to be a problem with drawing over existing tiles (drawing over empty tiles is fine).
Performance is also good if you paint on a new layer.
Expected behavior
Painting should not provoke hangs.
Specifications:
- OS: Arch Linux
- Tiled Version: v1.11.2
I tried to see what was going on by running perf record while painting one tile every second. Please find the perf report attached. I'm not sure how helpful it is.