http://bugs.freedesktop.org/show_bug.cgi?id=23182
Summary: [patch] GLUT - Incorrect Vista maximisation size due to
WM_GETMINMAXINFO handling
Product: Mesa
Version: 7.2
Platform: All
OS/Version: Windows (All)
Status: NEW
Severity: normal
Priority: medium
Component: GLUT
AssignedTo: [email protected]
ReportedBy: [email protected]
On Windows Vista in DWM (Desktop Window Manager) mode
the handling of WM_GETMINMAXINFO results in ptMaxSize
being set incorrectly in the case of a resolution
change into fullscreen mode.
In win32_winproc.c:
case WM_GETMINMAXINFO:
/* this voodoo is brought to you by Win32 (again). It allows the
window to be bigger than the screen, and smaller than 100x100
(although it doesn't seem to help the y minimum). */
minmax = (LPMINMAXINFO)lParam;
minmax->ptMaxSize.x = __glutScreenWidth;
minmax->ptMaxSize.y = __glutScreenHeight;
minmax->ptMinTrackSize.x = 0;
minmax->ptMinTrackSize.y = 0;
minmax->ptMaxTrackSize.x = __glutScreenWidth +
GetSystemMetrics(SM_CXSIZE) * 2;
minmax->ptMaxTrackSize.y = __glutScreenHeight +
GetSystemMetrics(SM_CXSIZE) * 2 + GetSystemMetrics(SM_CYCAPTION);
return 0;
Note that ptMaxSize is being set to __glutScreenWidth
and __glutScreenHeight, which have been observed to be
the initial desktop resolution - which may in fact be
smaller or larger than the appropriate fullscreen
"maximimised" resolution for WM_GETMINMAXINFO.
The two lines of code in question:
minmax->ptMaxSize.x = __glutScreenWidth;
minmax->ptMaxSize.y = __glutScreenHeight;
Seem to be trying to "guarantee" that a maximised GLUT
window will be fullscreen - but fails due to __glutScreenWidth
and __glutScreenHeight being wrong.
The proposed fix is to simply remove these two lines.
Observations:
- freeglut doesn't pay any attention to WM_GETMINMAXINFO.
- Nate Robbins GLUT 3.7.6 doesn't touch ptMaxSize, although
it does adjust ptMinTrackSize and ptMaxTrackSize
- The Mark Kilgard GLUT shipped with the Cg toolkit exhibits
the same runtime problem as MesaGlut 7.5
An alternative might be to ensure that __glutScreenWidth
and __glutScreenHeight are upto date for WM_GETMINMAXINFO,
or directly querying for the current (primary) desktop
resolution. But this seems like a lot of testing and
support without a clearer rationale for messing with
ptMaxSize.
See also:
http://en.wikipedia.org/wiki/Desktop_Window_Manager
http://msdn.microsoft.com/en-us/library/ms632626(VS.85).aspx
http://msdn.microsoft.com/en-us/library/ms632605(VS.85).aspx
"...
ptMaxSize
Specifies the maximized width ( POINT.x) and the maximized
height (POINT.y) of the window. For top-level windows, this
value is based on the width of the primary monitor...."
The proposed patch, relative to MesaGlut 7.5:
551,552d550
< minmax->ptMaxSize.x = __glutScreenWidth;
< minmax->ptMaxSize.y = __glutScreenHeight;
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