graphics display bug when using console and Lua draw functions?

waterwingz

11478

« on: 01 / November / 2013, 14:57:23 »

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From time to time I've run into a strange graphics interaction when using the CHDK console and the CHDK Lua drawing functions on the screen at the same time. Basically, the grey background of the console occasionally escapes from the console area and extends into the area being drawn by the Lua draw commands.

Here's a couple of screen shots that give an example of the phenomena. The red oval in the third shot shows the corruption - the grey you see there is outside of the defined console area. It can look much worse than this when there are more complex graphics than the simple blue box. I tried to keep the example simple here.

Here's the script. It does the same thing on three of my different camera models so its not a port specific thing.

Code: [Select]

--[[
@title Bleed Test
--]]
require("drawings")
props=require("propcase")
xpos =  70
ypos =  160
box_width = 230
box_height = 32
fg="white"
bg="blue"
set_console_layout(1 ,5, 45, 12 )
draw.add("rectf",  xpos, ypos, xpos+box_width, ypos+box_height, bg, bg)
val2=draw.add("string", xpos+76,  ypos+12, " -" ,  fg, bg)
i=0
repeat
   draw.replace(val2, "string", xpos+76,  ypos+12, "count="..i, fg, bg)
   draw.overdraw()
   if (i==20) then print("test") i=0 else i=i+1 end
   wait_click(100)
until not(is_key("no_key"))

Almost looks like an uninitialized variable problem or some weird interaction with the LCD display buffers when they change?

Logged

Ported : A1200 SD940 G10 Powershot N G16

philmoz

3070

Re: graphics display bug when using console and Lua draw functions?

« Reply #1 on: 01 / November / 2013, 18:10:29 »

Most likely a task switch at the wrong time

Console is drawn in spytask, lua drawing is done in keyboard task.

Draw code uses global variables so is not really safe.

Phil.

Logged

CHDK ports:
sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
g12 (1.00c, 1.00e, 1.00f & 1.00g)
sx130is (1.01d & 1.01f)
ixus310hs (1.00a & 1.01a)
sx40hs (1.00d, 1.00g & 1.00i)
g1x (1.00e, 1.00f & 1.00g)

waterwingz

11478

Re: graphics display bug when using console and Lua draw functions?

« Reply #2 on: 01 / November / 2013, 18:14:08 »

Quote from: philmoz on 01 / November / 2013, 18:10:29

Draw code uses global variables so is not really safe.

Something that could be fixed simply with a mutex / lock ?

Logged

Ported : A1200 SD940 G10 Powershot N G16

philmoz

3070

Re: graphics display bug when using console and Lua draw functions?

« Reply #3 on: 01 / November / 2013, 18:20:58 »

Quote from: waterwingz on 01 / November / 2013, 18:14:08

Quote from: philmoz on 01 / November / 2013, 18:10:29
Draw code uses global variables so is not really safe.
Something that could be fixed simply with a mutex / lock ?

I'd look at removing the need for global variables first.

Phil.

Logged

CHDK ports:
sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
g12 (1.00c, 1.00e, 1.00f & 1.00g)
sx130is (1.01d & 1.01f)
ixus310hs (1.00a & 1.01a)
sx40hs (1.00d, 1.00g & 1.00i)
g1x (1.00e, 1.00f & 1.00g)

waterwingz

11478

Re: graphics display bug when using console and Lua draw functions?

« Reply #4 on: 01 / November / 2013, 18:23:46 »

Quote from: philmoz on 01 / November / 2013, 18:20:58

I'd look at removing the need for global variables first.

Not having looked at the code, I was thinking of a q&d solution in case what is there proves to be a bear.

Are you going to look at it or should I?

WW

Logged

Ported : A1200 SD940 G10 Powershot N G16

waterwingz

11478

Re: graphics display bug when using console and Lua draw functions?

« Reply #5 on: 02 / November / 2013, 12:48:59 »

Patch file to fix this issue attached.

I can see ways to optimize this code for speed at the cost of code size. Doesn't seem worth the effort.

Update : newer patch file attached - previous was a version older and had a syntax error

gui_draw.patch (2.15 kB - downloaded 6 times.)

« Last Edit: 03 / November / 2013, 09:46:04 by waterwingz »

Logged

Ported : A1200 SD940 G10 Powershot N G16

philmoz

3070

Re: graphics display bug when using console and Lua draw functions?

« Reply #6 on: 03 / November / 2013, 02:49:01 »

Quote from: waterwingz on 02 / November / 2013, 12:48:59

Patch file to fix this issue attached.

I can see ways to optimize this code for speed at the cost of code size. Doesn't seem worth the effort.

Looks ok. I'm mostly offline for a few more days (and away from build PC).
I can add to SVN on Tuesday evening if reyalp can't do it sooner.

Phil.

Logged

CHDK ports:
sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
g12 (1.00c, 1.00e, 1.00f & 1.00g)
sx130is (1.01d & 1.01f)
ixus310hs (1.00a & 1.01a)
sx40hs (1.00d, 1.00g & 1.00i)
g1x (1.00e, 1.00f & 1.00g)

waterwingz

11478

Re: graphics display bug when using console and Lua draw functions?

« Reply #7 on: 03 / November / 2013, 10:03:50 »

Quote from: philmoz on 03 / November / 2013, 02:49:01

Looks ok. I'm mostly offline for a few more days (and away from build PC).
I can add to SVN on Tuesday evening if reyalp can't do it sooner.

Thanks philmoz. The patch I uploaded turned out to be one version older than what I tested (fumble fingers) and had an extra comma in one of the function calls. I fixed that and reposted. Also posted to the bug fix thread so it doesn't get lost.

Logged

Ported : A1200 SD940 G10 Powershot N G16