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STR #831: When moving an OpenGL window outside the screen and then back again lets fltk get stuck.

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The problem seems to be an idefinite repeat of the WM_PAINT message. The driver sends an internale WM_PAINT (one that does not contain an update region). FLTK then creates a union with the still existin 'i->region' of the OpenGL window, causing yet another WM_PAINT message.

The fix is to not run through the WM_PAINT handler at all if there is no update region (as suggested by Microsoft). This change is definetly debatable, since it does modify some internal FLTK behavior. I will commit it anyways for now, but we should pay very close attention to redraw problems by those who use the svn releases.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@4456 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Matthias Melcher 2005-07-25 09:51:20 +00:00
parent b1ad1a2f96
commit b6f2bc9250
2 changed files with 7 additions and 1 deletions
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1
CHANGES
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@ -2,6 +2,7 @@ CHANGES IN FLTK 1.1.7
- Documentation fixes (STR #648, STR #692, STR #730, STR
#744, STR #745, STR #942)
- WIN32: Internal WM_PAINT message now ignored (STR #831)
- Added Windows support for Fl_Window::xclass() (STR #848)
- Floating point input field allows characters from
current locale (STR #903)

7
src/Fl_win32.cxx
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@ -601,14 +601,19 @@ static LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lPar
Fl_Region R;
Fl_X *i = Fl_X::i(window);
i->wait_for_expose = 0;
char redraw_whole_window = false;
if (!i->region && window->damage()) {
// Redraw the whole window...
i->region = CreateRectRgn(0, 0, window->w(), window->h());
redraw_whole_window = true;
}
// We need to merge WIN32's damage into FLTK's damage.
R = CreateRectRgn(0,0,0,0);
GetUpdateRgn(hWnd,R,0);
int r = GetUpdateRgn(hWnd,R,0);
if (r==NULLREGION && !redraw_whole_window) {
break;
}
if (i->region) {
// Also tell WIN32 that we are drawing someplace else as well...