[Commits] [wesnoth/wesnoth] 449aed: Fix Bug #23908 - Crash on resize with SDL2.

[GitHub]

  Branch: refs/heads/sdl2
  Home:   https://github.com/wesnoth/wesnoth
  Commit: 449aed0a64e6b00e3f53d450a2a9dcaefebab306
      https://github.com/wesnoth/wesnoth/commit/449aed0a64e6b00e3f53d450a2a9dcaefebab306
  Author: Andreas Löf <andreas at alternating.net>
  Date:   2015-10-13 (Tue, 13 Oct 2015)

  Changed paths:
    M src/events.cpp
    M src/events.hpp
    M src/gui/widgets/grid.cpp
    M src/hotkey/hotkey_preferences_display.cpp
    M src/loadscreen.cpp
    M src/video.cpp
    M src/video.hpp

  Log Message:
  -----------
  Fix Bug #23908 - Crash on resize with SDL2.

SDL2 uses shared memory to communicate with the graphics system when
using a software renderer. A resize event will cause SDL2 to
invalidate the SDL_surface that relies on shared memory and any
subsequent calls to will be SDL_GetWindowSurface will cause the shared
memory do be unmapped as the old surface is released.  This is
problematic when it occurs during a rendering cycle, because the
software rendered may also invoke SDL_GetWindowSurface, making any
references to that surface that the game contains become stale. This
will in turn cause a segmentation fault during blitting.