reading off the bitmap

no-reply@allegro.cc (William Labbett) — Fri, 15 Sep 2006 23:47:29 +0000

hi,
i've got this here code :-

tile_type2 = _getpixel(map, x, y - 2)

while y < 2, the coordinates are off the bitmap. the docs say _getpixel() returns
-1 in such cases but in my program i get a crash as this line is executed.
I'm a bit puzzled.
tile_type2 is an int. I assume an int can hold a signed value. Is this right.

please help

no-reply@allegro.cc (LennyLen) — Fri, 15 Sep 2006 23:53:01 +0000

Quote:

I assume an int can hold a signed value. Is this right.

Yes. Unless you've declared it to be unsigned.

no-reply@allegro.cc (Richard Phipps) — Fri, 15 Sep 2006 23:54:19 +0000

I don't think _getpixel does any bounds checking. Try getpixel instead.

no-reply@allegro.cc (Evert) — Fri, 15 Sep 2006 23:58:20 +0000

Quote:

the docs say _getpixel() returns -1 in such cases

They most definately do not:

man _getpixel said:

These
won't work in mode-X, and don't do any clipping, so you must make sure
the point lies inside the bitmap.

You're confused with getpixel().

no-reply@allegro.cc (LennyLen) — Sat, 16 Sep 2006 00:01:52 +0000

Grrrrrr, at the bug that causes underscores to not show up (is this a forum bug, or browser bug?). I thought he WAS using getpixel():

{"name":"590176","src":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/1\/b\/1b22c6d1449bdeb7fa4c73e3c5a371cc.jpg","w":353,"h":50,"tn":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/1\/b\/1b22c6d1449bdeb7fa4c73e3c5a371cc"}

no-reply@allegro.cc (Evert) — Sat, 16 Sep 2006 00:04:09 +0000

Quote:

is this a forum bug, or browser bug?

I have no idea what you're talking about. I can see underscores just fine... maybe check your font settings.

no-reply@allegro.cc (Richard Phipps) — Sat, 16 Sep 2006 00:05:09 +0000

The underscore shows up fine here too.

no-reply@allegro.cc (William Labbett) — Sat, 16 Sep 2006 00:12:53 +0000

Thanks

I supposed because getpixel() checkedl, _getpixel would too.
I'll let you know how I get on (so if someone would kindly bump for me?).

Thanks

no-reply@allegro.cc (LennyLen) — Sat, 16 Sep 2006 00:28:10 +0000

Quote:

I have no idea what you're talking about. I can see underscores just fine... maybe check your font settings.

I know I'm not the only person affected by this, as I've seen other mention it before. It's not a font problem, as sometimes the underscore is visible, and at other times not. This only occurs on underscores on hyperlinks, and it could be an Opera bug, as it looks fine with FF, but I've only ever seen it occur on this forum.

testing_testing

[edit]I can see the above underscore no problem, but the original is still not visible.

no-reply@allegro.cc (Onewing) — Sat, 16 Sep 2006 01:10:45 +0000

Yeah, I couldn't see the underscores either. Using Opera.

no-reply@allegro.cc (William Labbett) — Sat, 16 Sep 2006 02:32:40 +0000

thanks for the help, it's working now.