I am getting the error message "DirectX Error: TXFORM2" at runtime when i try to lock a bitmap with bmap_lock.

Heres what im doing:

BMAP* letter_bmap;

function main()
{ letter_bmap = bmap_create("georgia_font2.jpg");
wait(1);
bmap_to_format(letter_bmap,8888);
bmap_lock(letter_bmap,0);
}

Does anyone know what this error means?

I don't know what that error means exactly, but check if bmap_to_format actually worked.
If it returns 0, then the conversion failed.

Also, as you can read in the manual under "file formats", the use of the jpg is discouraged:


Also:

So maybe DirectX loads them in a way so that you can't use bmap lock and other manipulation functions. You might want to try the same code with another file format.



Hope this helped.

ok - did some testing. The bmap_to_format is not failing - its converting the bmap successfully. I also converted the file to .tga format - no luck, i still get the DirectX Error: TXFORM2.

as it is described in the manual at bmap_lock page, it's not allowed to use bmap_lock before the first frame, and in your code there is no level loaded. put a level_load(NULL); in the beginning and a wait(1); it should work fine.

He put a wait(1) in the code above.



That is really not needed as it should not have any effect on the 2D functions.

Im loading a level, and doing a wait(1); after loading it. I just didnt include that code or the other things im doing in main as they didnt seem pertinent to the problem.

hummmm....well i found a fix - but its a strange one. I put the bmap_lock in a subroutine with the bmap its locking passed as a parameter and now it works fine.

Heres the code:

function my_bmap_lock_func(BMAP* letter_bmap)
{ bmap_lock(letter_bmap,0);
....
<bitmap manipulation code goes here>
....
return;
}

function main()
{ BMAP* letter_bmap;
level_load("my_level.wmb");
wait(1);
letter_bmap = bmap_create("georgia_font2.tga");
wait(1);
bmap_to_format(letter_bmap,8888);
my_bmap_lock_func(letter_bmap);
}

so very very odd.....

are you unlocking it?

Cause: "A bitmap must be unlocked for being visible on the screen."

This could cause the crash.

yeah, im unlocking it later, at the end of the subroutine - or rather, before i was using a subroutine, i was unlocking it at the end of main, but seeing as how it was crashing on the bmap_lock() command, unlocking it seemed like a moot point.

strange. but I never had any reason to lock a bmap in main function