SDL_CreateCursor(): maximum cursor size

SDL Development
#1

Hello, all

Does SDL provide any kind of error-handling for its facili-
ties SDL_CreateCursor() and SDL_SetCursor() for the imple-
mentation of custom cursors? I am trying to implement a
cross-platform function that shall generate a cursor bitmap
of a size suitable to for the current display dimensions and
DPI, in order that it shall not look too large or too small.

Unfortunately, my test program simply crashes if I try to
install a cursor larger than a certain OS-specific limit.
For example, my development machine with Windows XP supports
cursors up to 32x32 pixels, but no larger ā€“ a fact I found
out by direct experiment ā€“ tyring various sizes and seeing
whether they caused a crash.

Is there a more elegant dynamic way of determining the maxi-
mum cursor size, for I would rather not hard-code it into my
algorithm for each OS?

1 Like
#2

Although Discourse is advertised as a mailing-list manage-
ment system, it is certainly is not equal to the task: I see
that is has distorted my message by collapsing consequtive
spaces used for justification and replaced ASCII dashes con-
sisting of a pair of ASCII ā€œminusā€ characters by single mi-
nuses. Futhermore, it has excised my signature and committed
the gross offence of displaying my e-mail in a proportional
font, whereas hard-wrapped pre-formatted text must always be
displayed in a monospace font. If my original post looks
awful, it not my fault.

#3

It looks fine to me on the web page. The pair of ASCII ā€˜minusā€™ characters has been replaced by a single M-dash (ā€“) which is precisely in line with your typographical intent, I would guess. There is some guidance on post formatting here.

#4

rtrussell to Anton Shepelev:

> > If my original post looks awful, it not my fault.
>
> It looks fine to me on the web page
> https://discourse.libsdl.org/t/sdl-createcursor-maximum-cursor-size/28742/2).
> The  pair of ASCII 'minus' characters has been replaced by
> a single M-dash (--) which is precisely in line with  your
> typographical intent, I would guess.

But  I  wrote  a  7-bit-clean ASCII message and did not give
permission to the mailing list to modify it. Here is what it
should look like:

   https://freeshell.de/~antonius/img_host/sdl_cursor_q.png

> There is some guidance on post formatting here:
> https://meta.discourse.org/t/post-format-reference-documentation/19197

I  see  it  supports  Markdown,  BBCode, and HTML -- all new
stuff that did not exist when e-mail was  invented,  and  no
decent   mailing  list  may  be  expected -- let  alone  re-
quired -- to support these markup  languages.  e-mail  is  a
plain-text  medium.  Displaying e-mail messages in a propor-
tional font makes no sense because line length  is  measured
in characters, so one needs a character-cell device or medi-
um where all characters take the same rectangular area.

What is worse, e-mail notifications that I receive by way of
mailing-list  mode are multi-part messages with a plain-text
and HTML parts. Only the plain-text part is correct.  But  I
trow  I  had  better  stop ranting about Discourse in an SDL
group. I wish you had not migrated  your  mailing  lists  to
Discourse, though!

I have formatted this e-mail as a Markdown code block, using
a four-space indent, but I fear that Disourse will  fail  to
recognise  is  it from e-mail, expecting me to do it via the
web interface...
#5

Yes, Discourse is awful, and itā€™s ā€œmaintainedā€ by people who are actively hostile to bug reports and requests and suggestions on how to improve it. I warned the SDL team that this was the case when they were considering ā€œupgradingā€ to Discourse, but they went with it anyway.