Paint canvas drawing lags behind tools in OLPC 13.1.0 os2

[greenfeld]

1. Using the drawing tool, hold the primary mouse button down and rapidly move the pointer around.
2. The canvas drawing that appears onscreen will lag behind the tool's movement, sometimes by several seconds.
3. Other tools (Erase, etc.) seem to be similarly affected.

Seen on XO-1 & XO-1.75 with 13.1.0 os2/Paint-44. May be related to #3935.

[godiard]

#3935 is a TamTam ticket. Why you think is connected?

I think drawing is slower due to the use of cairo. We need see what can we do to improve performance from Paint side, but also look at cairo performance in general.

[greenfeld]

#3935 is another problem which could be caused by slow drawing (by the activity or a toolkit, not the user) or failure to properly tell some layer (GTK, the video card, etc.) when to flush output to show it onscreen.

[godiard]

Please test again in os5

[godiard]

Is working better now, reopen if needed.

[greenfeld]

Drawing seems to be a bit better on slower XOs in 13.1.0 os7 (still can be a half second or so behind).

[dnarvaez]

Milestone 0.98 deleted