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Add workaround for the problem of locking the mouse in windowed mode with X.org 1.20.1. (thanks to DosFreak and ny00123 for their help with testing and debugging)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4177
This commit is contained in:
Peter Veenstra 2018-12-11 15:45:37 +00:00
parent e0a7ede037
commit f5e4b9205f
1 changed files with 19 additions and 0 deletions
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19
src/gui/sdlmain.cpp
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@ -1522,6 +1522,12 @@ bool GFX_IsFullscreen(void) {
#define DB_POLLSKIP 1
#endif
#if defined(LINUX)
#define SDL_XORG_FIX 1
#else
#define SDL_XORG_FIX 0
#endif
void GFX_Events() {
//Don't poll too often. This can be heavy on the OS, especially Macs.
//In idle mode 3000-4000 polls are done per second without this check.
@ -1545,6 +1551,19 @@ void GFX_Events() {
}
#endif
while (SDL_PollEvent(&event)) {
#if SDL_XORG_FIX
// Special code for broken SDL with Xorg 1.20.1, where pairs of inputfocus gain and loss events are generated
// when locking the mouse in windowed mode.
if (event.type == SDL_ACTIVEEVENT && event.active.state == SDL_APPINPUTFOCUS && event.active.gain == 0) {
SDL_Event test; //Check if the next event would undo this one.
if (SDL_PeepEvents(&test,1,SDL_PEEKEVENT,SDL_ACTIVEEVENTMASK) == 1 && test.active.state == SDL_APPINPUTFOCUS && test.active.gain == 1) {
// Skip both events.
SDL_PeepEvents(&test,1,SDL_GETEVENT,SDL_ACTIVEEVENTMASK);
continue;
}
}
#endif
switch (event.type) {
case SDL_ACTIVEEVENT:
if (event.active.state & SDL_APPINPUTFOCUS) {