//// "$Id: Fl_Overlay_Window.cxx,v 1.1.1.1 2003/08/07 21:18:40 jasonk Exp $"//// Overlay window code for the Fast Light Tool Kit (FLTK).//// Copyright 1998-1999 by Bill Spitzak and others.//// This library is free software; you can redistribute it and/or// modify it under the terms of the GNU Library General Public// License as published by the Free Software Foundation; either// version 2 of the License, or (at your option) any later version.//// This library is distributed in the hope that it will be useful,// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU// Library General Public License for more details.//// You should have received a copy of the GNU Library General Public// License along with this library; if not, write to the Free Software// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307// USA.//// Please report all bugs and problems to "fltk-bugs@easysw.com".//// A window using double-buffering and able to draw an overlay// on top of that.  Uses the hardware to draw the overlay if// possible, otherwise it just draws in the front buffer.#include <config.h>#include <FL/Fl.H>#include <FL/Fl_Overlay_Window.H>#include <FL/fl_draw.H>#include <FL/x.H>void Fl_Overlay_Window::show() {  Fl_Double_Window::show();  if (overlay_ && overlay_ != this) overlay_->show();}void Fl_Overlay_Window::hide() {  Fl_Double_Window::hide();}void Fl_Overlay_Window::flush() {  int erase_overlay = (damage()&FL_DAMAGE_OVERLAY);  clear_damage(damage()&~FL_DAMAGE_OVERLAY);  Fl_Double_Window::flush(erase_overlay);  if (overlay_ == this) draw_overlay();}void Fl_Overlay_Window::resize(int X, int Y, int W, int H) {  Fl_Double_Window::resize(X,Y,W,H);  if (overlay_ && overlay_!=this) overlay_->resize(0,0,w(),h());}Fl_Overlay_Window::~Fl_Overlay_Window() {  hide();//  delete overlay; this is done by ~Fl_Group}#if !HAVE_OVERLAYint Fl_Overlay_Window::can_do_overlay() {return 0;}void Fl_Overlay_Window::redraw_overlay() {  overlay_ = this;  clear_damage(damage()|FL_DAMAGE_OVERLAY);  Fl::damage(FL_DAMAGE_CHILD);}#elseextern XVisualInfo *fl_find_overlay_visual();extern XVisualInfo *fl_overlay_visual;extern Colormap fl_overlay_colormap;extern unsigned long fl_transparent_pixel;static GC gc;	// the GC used by all X windowsextern uchar fl_overlay; // changes how fl_color(x) worksclass _Fl_Overlay : public Fl_Window {  friend class Fl_Overlay_Window;  void flush();  void show();public:  _Fl_Overlay(int x, int y, int w, int h) :    Fl_Window(x,y,w,h) {set_flag(INACTIVE);}};int Fl_Overlay_Window::can_do_overlay() {  return fl_find_overlay_visual() != 0;}void _Fl_Overlay::show() {  if (shown()) {Fl_Window::show(); return;}  fl_background_pixel = int(fl_transparent_pixel);  Fl_X::make_xid(this, fl_overlay_visual, fl_overlay_colormap);  fl_background_pixel = -1;  // find the outermost window to tell wm about the colormap:  Fl_Window *w = window();  for (;;) {Fl_Window *w1 = w->window(); if (!w1) break; w = w1;}  XSetWMColormapWindows(fl_display, fl_xid(w), &(Fl_X::i(this)->xid), 1);}void _Fl_Overlay::flush() {  fl_window = fl_xid(this);  if (!gc) gc = XCreateGC(fl_display, fl_xid(this), 0, 0);  fl_gc = gc;  fl_overlay = 1;  Fl_Overlay_Window *w = (Fl_Overlay_Window *)parent();  Fl_X *i = Fl_X::i(this);  if (damage() != FL_DAMAGE_EXPOSE) XClearWindow(fl_display, fl_xid(this));  fl_clip_region(i->region); i->region = 0;  w->draw_overlay();  fl_overlay = 0;}void Fl_Overlay_Window::redraw_overlay() {  if (!fl_display) return; // this prevents fluid -c from opening display  if (!overlay_) {    if (can_do_overlay()) {      Fl_Group::current(this);      overlay_ = new _Fl_Overlay(0,0,w(),h());      Fl_Group::current(0);    } else {      overlay_ = this;	// fake the overlay    }  }  if (shown()) {    if (overlay_ == this) {      clear_damage(damage()|FL_DAMAGE_OVERLAY);      Fl::damage(FL_DAMAGE_CHILD);    } else if (!overlay_->shown())      overlay_->show();    else      overlay_->redraw();  }}#endif//// End of "$Id: Fl_Overlay_Window.cxx,v 1.1.1.1 2003/08/07 21:18:40 jasonk Exp $".//