Roku Developer Program

[rscott]

Hi,

I'm new to Roku developing, so please bear with me if I'm missing something obvious.

I have written a script that repeatedly downloads a PNG image and displays it.

The script works, it is just slow. When narrowing down where the delays were, I saw that it was taking about 200-300ms to complete the dwDrawImage(screen,"tmp:/myphoto.png",0,0) command.

I've tried using screen.DrawObject() and screen.DrawScaledObject(), but both take a similar amount of time.

The only thing that comes to mind is the I/O of loading the file (it's around 600K). I tried switching to a compressed JPEG (40K), but the timing was similar (that sped up the download speed a bit, but not the drawing time).

Does anyone have any thoughts?

Here is the relevant code:

http = CreateObject("roUrlTransfer")		' Moved here from while loop to potentially save resources
http.SetUrl("http://192.168.1.5/img.jpg")
dt.Mark()
print dt.GetHours().tostr() + ":" + dt.GetMinutes().tostr() + ":" + dt.GetSeconds().tostr() + "." + dt.GetMilliseconds().tostr() + " PRE DOWNLOAD"
http.GetToFile("tmp:/myphoto.jpg")

dt.Mark()
print dt.GetHours().tostr() + ":" + dt.GetMinutes().tostr() + ":" + dt.GetSeconds().tostr() + "." + dt.GetMilliseconds().tostr() + " POST DOWNLOAD"
dfDrawImage(screen, "tmp:/myphoto.jpg",0,0)
dt.Mark()
print dt.GetHours().tostr() + ":" + dt.GetMinutes().tostr() + ":" + dt.GetSeconds().tostr() + "." + dt.GetMilliseconds().tostr() + " DONE DRAW"

[RokuRobB]

I wonder if the server you are hitting cached the original request so that the 600kb image was always being saved and rendered? Perhaps try forcing a new download (using a new file name or adding a bogus query parameter to the query) and deleting the temp file before storing it for rendering by DrawObject.