Possible to find out LCD size? - LUA Scripting - CHDK Forum
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Possible to find out LCD size?

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Offline ernstegon

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Possible to find out LCD size?
« on: 27 / December / 2013, 17:41:01 »
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Is there a way to find out the camera's LCD size (in pixels)? I've read the pages detailing propcases, but finding out the LCD size doesn't seem to be included.
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Offline waterwingz

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Re: Possible to find out LCD size?
« Reply #1 on: 27 / December / 2013, 17:56:12 »
Quote from: ernstegon on 27 / December / 2013, 17:41:01
Is there a way to find out the camera's LCD size (in pixels)? I've read the pages detailing propcases, but finding out the LCD size doesn't seem to be included.
msl uses a Lua function that does it in a "brute force" kind of way :

Code: [Select]
function screen_w()     -- lookup table for 480 px screen
    local cams = "ixus110_sd960|ixus200_sd980|ixus240_elph320hs|ixus300_sd4000|ixus310_elph500hs|ixus1000_sd4500|sx1|sx210is|sx220hs|sx230hs"
    return string.find(cams, get_buildinfo().platform) and 480 or 360
end
Not too sure I'd want to try and code that in uBASIC though .... ::)
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline reyalp

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Re: Possible to find out LCD size?
« Reply #2 on: 27 / December / 2013, 19:09:59 »
Ugh, good reminder we need to add functions for this.

Assuming the size of interest is the bitmap it should be fairly straightforward. There are different "real" and adjusted sizes, but I guess the most useful would be the same ones the drawing functions use.

I'm not sure this is needed in ubasic since it doesn't have drawing functions.
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Offline waterwingz

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Re: Possible to find out LCD size?
« Reply #3 on: 28 / December / 2013, 08:15:24 »
Quote from: reyalp on 27 / December / 2013, 19:09:59
Ugh, good reminder we need to add functions for this.
Candidate patch file attached.

Sample script :
Code: [Select]
--[[
@title Screen Resolution
--]]
set_console_layout(1 ,4, 45, 16 )
info = get_screenInfo()
print("screen width:"..info.screen_width,"screen height:"..info.screen_height)
print("buffer width:"..info.buffer_width,"buffer height:",info.buffer_height)
print("aspect correction:",info.aspect_correction)
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline reyalp

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Re: Possible to find out LCD size?
« Reply #4 on: 28 / December / 2013, 17:42:50 »
Quote from: waterwingz on 28 / December / 2013, 08:15:24
Candidate patch file attached.
Thanks.

For drawing, do we really need anything more than the bitmap width / height in CHDK adjusted coordinates?

I'm not sure how you would use the buffer sizes or aspect correction, but I haven't used the drawing stuff much.

Also aspect_correction and has_variable_aspect are two different things.

CAM_USES_ASPECT_CORRECTION means the camera has 2x1 bitmap pixels instead of (roughly) square bitmap pixels.

CAM_HAS_VARIABLE_ASPECT is something else related to zebra on cameras with a 16:9 screen, which appears to be mis-defined in some ports...
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Offline waterwingz

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Re: Possible to find out LCD size?
« Reply #5 on: 28 / December / 2013, 17:57:04 »
Quote from: reyalp on 28 / December / 2013, 17:42:50
For drawing, do we really need anything more than the bitmap width / height in CHDK adjusted coordinates?
I just threw in everything I found there - its basically free once you go to the trouble of adding the function.
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline reyalp

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Re: Possible to find out LCD size?
« Reply #6 on: 28 / December / 2013, 19:25:48 »
Quote from: waterwingz on 28 / December / 2013, 17:57:04
I just threw in everything I found there - its basically free once you go to the trouble of adding the function.
In this case I think less is more :)

Trunk changeset 3282 adds
get_gui_screen_width() and get_gui_screen_height()

Code: [Select]
draw_rect(0,0,get_gui_screen_width()-1,get_gui_screen_height()-1,259)

should draw a red rectangle around the screen on most cameras. Some old cameras like a540 are only visible pixels wide, even though they report 360.

I put _gui in the name because "screen" will be ambiguous if we ever add viewport or unadjusted bitmap dimensions. Since there's only two, having individual functions seems more convenient than having a table.

Since these are trivial, I'm OK backporting these to 1.2, but I'd like to know if they meet peoples needs first.
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Offline waterwingz

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Re: Possible to find out LCD size?
« Reply #7 on: 28 / December / 2013, 19:42:04 »
Quote from: reyalp on 28 / December / 2013, 19:25:48
Since these are trivial, I'm OK backporting these to 1.2, but I'd like to know if they meet peoples needs first.
All I needed was the ability to center the display widgit in a couple of my scripts and for that it's fine.  Can't speak for anyone else though.
« Last Edit: 28 / December / 2013, 19:47:30 by waterwingz »
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Ported :   A1200    SD940   G10    Powershot N    G16
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