Thanks Team GandK!!!

You are very welcome!

Can you explain the technique you used to speed it up?

-JT

"renojim" wrote:
Can you explain the technique you used to speed it up?

I don't know what he actually ended up going with, but I gave him pointers on how to utilize multiple canvas objects for increased performance. His kaboom game has the added benefit of being laid out so he doesn't actually have to call show on the lower canvas objects most the time since there's little overlapping. It boiled down to "use a different canvas for the cursor, and re-draw a black cursor int the previous position.

From your previous posts, and the performance of the Video Poker channel, I suspect you are already doing this.

"kbenson" wrote:

"renojim" wrote:
Can you explain the technique you used to speed it up?

I don't know what he actually ended up going with, but I gave him pointers on how to utilize multiple canvas objects for increased performance. His kaboom game has the added benefit of being laid out so he doesn't actually have to call show on the lower canvas objects most the time since there's little overlapping. It boiled down to "use a different canvas for the cursor, and re-draw a black cursor int the previous position.

From your previous posts, and the performance of the Video Poker channel, I suspect you are already doing this.

I'm curious... when I tried using multiple canvases to draw the screen, I found that only the last canvas was redrawn after the screensaver was canceled. Did you find a way around that?

EDIT: I just tested with KidPaint, and it seems the drawing gets erased when you return from the screensaver. Initially just the cursor can be seen (painted on top of the screensaver data). The background and tools redraw eventually when you move the cursor around, but anything you drew previously does not. I'm guessing it's hidden behind the background canvas at this point. Something worth considering, if you decide to use the multiple canvas technique.

That's why video poker has a private screensaver. 😉 When the box awakens from the screensaver, I draw both canvases.

-JT

"renojim" wrote:
That's why video poker has a private screensaver. 😉 When the box awakens from the screensaver, I draw both canvases.

How do you detect a return from screensaver? Are you writing something to tmp or the registry?

What we did is just track the time between messages. If it has been more than 5 minutes (minimum time for screensaver) since the last message, we trigger a show of all visible canvas objects, in order.

"kbenson" wrote:
What we did is just track the time between messages. If it has been more than 5 minutes (minimum time for screensaver) since the last message, we trigger a show of all visible canvas objects, in order.

I noticed that KidPaint did that on the second keypress after the screensaver, but I don't like the idea of requiring the user to press a button twice to properly redraw after the screensaver. It makes some sense in KidPaint, since you're actively interacting with the channel, but not really in any of my audio channels. The route I took originally was to write an update to a tmp file every second, and then poll for that in my main app, but that felt too much like a hack (not that anything else being discussed here doesn't also feel like a hack).

Also, did you see my note above about the drawing getting erased in KidPaint after the screensaver? Is that down to the timing between painting canvases, which seems to be completely unpredictable?

"kbenson" wrote:

"renojim" wrote:
Can you explain the technique you used to speed it up?

I don't know what he actually ended up going with, but I gave him pointers on how to utilize multiple canvas objects for increased performance. His kaboom game has the added benefit of being laid out so he doesn't actually have to call show on the lower canvas objects most the time since there's little overlapping. It boiled down to "use a different canvas for the cursor, and re-draw a black cursor int the previous position.

From your previous posts, and the performance of the Video Poker channel, I suspect you are already doing this.

Yup, I'm now using 3 canvases. First one is black screen & message on the side. Second is the board. And third is the cursor. And I'm using the timer to force a full redraw whenever the wait has been 5 minutes or longer.

"TheEndless" wrote:

Also, did you see my note above about the drawing getting erased in KidPaint after the screensaver? Is that down to the timing between painting canvases, which seems to be completely unpredictable?

I didn't, thanks for the bug report!

It's probably to do with the number of items on that canvas when the full redraw is a attempted. We've found that calling show() on a canvas object before a different canvas has finished it's show() makes the prior attempt fail. This can be problematic for the main back-drawing canvas, as it continually gets more and more images added, and there's no definitive way to tell when a canvas has finished it's show(). Since we use anywhere between 8-10 canvas objects (currently), the timings can be complex... That's why there's sometimes artifacts on some of the submenus as well.