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Windows: avoid changing the current Fl_Surface_Device when drawing an Fl_Double_Window.

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This change was previously attempted at r.12792 but the test/offscreen demo did not run well with it.
This commit fixes the problem: the global fl_window should not be changed when drawing to
an Fl_Double_Window.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12868 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy 2018-04-24 10:45:30 +00:00
parent ece56437a6
commit c82fca51fa
1 changed files with 1 additions and 4 deletions
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5
src/drivers/WinAPI/Fl_WinAPI_Window_Driver.cxx
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@ -307,7 +307,7 @@ void Fl_WinAPI_Window_Driver::flush_double()
}
if (pWindow->damage() & ~FL_DAMAGE_EXPOSE) {
fl_clip_region(i->region); i->region = 0;
#if 1 /* Short form that transiently changes the current Fl_Surface_Device */
#if 0 /* Short form that transiently changes the current Fl_Surface_Device */
fl_begin_offscreen(other_xid);
fl_graphics_driver->clip_region( 0 );
draw();
@ -317,10 +317,8 @@ void Fl_WinAPI_Window_Driver::flush_double()
The code run in the window draw() method can call Fl_Surface_Device::surface()
and conclude that it's drawing to the display, which is ultimately true
for an Fl_Double_Window.
With this form, test/offscreen does not work ==> needs investigation.
*/
HDC sgc = fl_gc;
Window save_w = fl_window; fl_window = (Window)other_xid;
fl_gc = fl_makeDC(other_xid);
int savedc = SaveDC(fl_gc);
fl_graphics_driver->gc(fl_gc);
@ -328,7 +326,6 @@ void Fl_WinAPI_Window_Driver::flush_double()
draw();
RestoreDC(fl_gc, savedc);
DeleteDC(fl_gc);
fl_window = save_w;
fl_graphics_driver->gc(sgc);
#endif
}