diff options
| -rw-r--r-- | src/Fl_Double_Window.cxx | 33 |
1 files changed, 17 insertions, 16 deletions
diff --git a/src/Fl_Double_Window.cxx b/src/Fl_Double_Window.cxx index 29a3b2599..76474078c 100644 --- a/src/Fl_Double_Window.cxx +++ b/src/Fl_Double_Window.cxx @@ -338,9 +338,11 @@ void Fl_Double_Window::flush(int eraseoverlay) { Fl_X *myi = Fl_X::i(this); if (!myi->other_xid) { #if USE_XDBE - if (can_xdbe()) myi->other_xid = - XdbeAllocateBackBufferName(fl_display, fl_xid(this), XdbeUndefined); - else + if (can_xdbe()) { + myi->other_xid = + XdbeAllocateBackBufferName(fl_display, fl_xid(this), XdbeCopied); + myi->backbuffer_bad = 1; + } else #endif #ifdef __APPLE_QD__ if ( ( !QDIsPortBuffered( GetWindowPort(myi->xid) ) ) @@ -360,28 +362,27 @@ void Fl_Double_Window::flush(int eraseoverlay) { } #if USE_XDBE if (use_xdbe) { - // if this is true, copy rather than swap so back buffer is preserved: - int copy = (myi->region || eraseoverlay); - if (myi->backbuffer_bad) { // make sure we do a complete redraw... + if (myi->backbuffer_bad) { + // Make sure we do a complete redraw... if (myi->region) {XDestroyRegion(myi->region); myi->region = 0;} clear_damage(FL_DAMAGE_ALL); + myi->backbuffer_bad = 0; } + + // Redraw as needed... if (damage()) { fl_clip_region(myi->region); myi->region = 0; fl_window = myi->other_xid; draw(); fl_window = myi->xid; } - if (!copy) { - XdbeSwapInfo s; - s.swap_window = fl_xid(this); - s.swap_action = XdbeUndefined; - XdbeSwapBuffers(fl_display, &s, 1); - myi->backbuffer_bad = 1; - return; - } - // otherwise just use normal copy from back to front: - myi->backbuffer_bad = 0; // which won't destroy the back buffer... + + // Copy contents of back buffer to window... + XdbeSwapInfo s; + s.swap_window = fl_xid(this); + s.swap_action = XdbeCopied; + XdbeSwapBuffers(fl_display, &s, 1); + return; } else #endif if (damage() & ~FL_DAMAGE_EXPOSE) { |