Size Detectors

[Steam Ranger]

I want a way to detect two sizes, although a presume the methods for each of them will be quite different.

1. A function that can give me the size of the workbench screen
2. The size of the monitor, assuming low resolution.

If the first one already exists, point me to it. But I'm pretty sure there's no function for the second one.
And by the way, I'm working with intuition V36, DOS V36 etc.

Thanks in advance!

[hooverphonique]

The Amiga has no way of communicating with the display, so it cannot know its size.

For Workbench size, I suppose you could do LockPubScreen(null) and then interrogate the screen structure to get the horz/vert size (or something similar).

[Steam Ranger]

Originally Posted by hooverphonique

The Amiga has no way of communicating with the display, so it cannot know its size.

Then how does workbench run as fullscreen?

Edit: Thanks for your suggestion about the workbench size, it works perfectly!

I'll share the macro I made:

macro	Call		
xref	_LVO\1		
jsr	_LVO\1(A6)	
endm			

macro	ClrA		
suba.l	\1,\1		
endm			

macro	GetWBSize
ClrA	A0
Call	LockPubScreen
move.l	D0,A1
move.w	sc_Width(A1),WBWidth
move.w	sc_Height(A1),WBHeight
Call	UnlockPubScreen
endm

...

WBWidth		dc.w	0
WBHeight	dc.w	0

[hooverphonique]

Originally Posted by Steam Ranger

Then how does workbench run as fullscreen?

To put it simply, the monitor will stretch the time period of vertical and horizontal sync to fit the size of the display.

Originally Posted by Steam Ranger

Edit: Thanks for your suggestion about the workbench size, it works perfectly!

You're welcome!

[meynaf]

The monitor does not dictate its size. It's the Amiga that does.
To know maximum sizes you can have a look at intuition.library's QueryOverscan function.

[Thomas Richter]

Originally Posted by Steam Ranger

I want a way to detect two sizes, although a presume the methods for each of them will be quite different.

It would be necessary to explain more precisely what you mean by "size". Is that "resolution in pixels"? If so, this depends on the display mode, and the graphics display info database contains such information.



Or do you mean resolution as in "how large are the pixels" in arbitrary units? If so, the display info database also contains information on pixel sizes. This can be used to scale graphics (such that circles appear as circles and not as ellipses).



If you mean "absolute size in a length scale", then that information is not available to the Amiga as it does not provide a backwards channel which would allow the Amiga to read the monitor EDID data.

[Steady]

As an addition, calling LockPubScreen(NULL) returns the default public screen, which may not necessarily be the Workbench, though it usually is and may be what you want.

If you want to specifically know the Workbench's dimensions regardless of whether it is the default public screen, call LockPubScreen("Workbench").