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Bug 196 - SDL_WM_SetCaption behaviour varies...
Summary: SDL_WM_SetCaption behaviour varies...
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: video (show other bugs)
Version: HG 1.2
Hardware: All All
: P2 normal
Assignee: Ryan C. Gordon
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2006-04-09 09:24 UTC by Ryan C. Gordon
Modified: 2006-05-05 01:09 UTC (History)
1 user (show)

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Description Ryan C. Gordon 2006-04-09 09:24:25 UTC 
On Mac OS X, calling SDL_WM_SetCaption() before SDL_SetVideoMode() works, but recalling SDL_SetVideoMode() (for example, to toggle fullscreen/windowed), results in a window without a caption. Should this state be kept permanently, or is it only meant to be valid until SetVideoMode returns?

On Linux/x11, setting the caption before SetVideoMode results in an empty title bar...it has to be called after SetVideoMode returns successfully.

Which behaviour is correct? Is either correct?

Tested on Linux/x11 and Mac OS X/quartz.

#include "SDL.h"

int main(int argc, char **argv)
{
    SDL_WM_SetCaption("title", "icon");
    SDL_SetVideoMode(640, 480, 0, SDL_FULLSCREEN);
    SDL_Delay(3000);
    SDL_SetVideoMode(640, 480, 0, 0);
    SDL_Delay(5000);
    SDL_Quit();
    return 0;
}

--ryan.
Comment 1 Sam Lantinga 2006-04-13 09:13:10 UTC 
The correct behavior is to have the window and icon titles persist.  They are stored in SDL_VideoDevice so this is possible.
Comment 2 Max Horn 2006-04-15 08:02:15 UTC 
Actually, the Quartz backend works correctly (no surprise, it uses wm_title / wm_icon to achieve just that), *provided* you add
 	SDL_Init(SDL_INIT_VIDEO);
to the start of your test program. Without that, it behaves indeed oddly, but I thought we are required to call SDL_Init anyway?

Looking through the various video drivers, the windows one uses wm_title / wm_icon, too. No other driver seems to do that, but that doesn't mean they behave incorrectly, of course.
Comment 3 Ryan C. Gordon 2006-04-15 11:29:19 UTC 
Whoops! I'm surprised that worked at all without the SDL_Init call, too, but I'm sure I saw the wrong behaviour with an SDL_Init, too, on one of my projects. I'll have to recheck.

--ryan.
Comment 4 Sam Lantinga 2006-04-15 12:05:03 UTC 
They should all probably use wm_title and wm_icon.  I'm not sure why the X11 driver doesn't...
Comment 5 Sam Lantinga 2006-04-17 02:48:59 UTC 
Feel free to change the X11 driver to use wm_title and wm_icon.  I'm pretty sure it wasn't done that way originally just to prevent a memory leak with the atoms when changing video modes.
Comment 6 Sam Lantinga 2006-05-05 01:09:37 UTC 
This is fixed in subversion.  As Max mentioned, you need to call SDL_Init(SDL_INIT_VIDEO) first.