/usr/include/FL/Fl_Double_Window.H is in libfltk1.3-dev 1.3.4-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// "$Id: Fl_Double_Window.H 9637 2012-07-24 04:37:22Z matt $"
//
// Double-buffered window header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
/* \file
Fl_Double_Window widget . */
#ifndef Fl_Double_Window_H
#define Fl_Double_Window_H
#include "Fl_Window.H"
/**
The Fl_Double_Window provides a double-buffered window.
If possible this will use the X double buffering extension (Xdbe). If
not, it will draw the window data into an off-screen pixmap, and then
copy it to the on-screen window.
<P>It is highly recommended that you put the following code before the
first show() of <I>any</I> window in your program: </P>
\code
Fl::visual(FL_DOUBLE|FL_INDEX)
\endcode
This makes sure you can use Xdbe on servers where double buffering
does not exist for every visual.
*/
class FL_EXPORT Fl_Double_Window : public Fl_Window {
protected:
void flush(int eraseoverlay);
/**
Force double buffering, even if the OS already buffers windows
(overlays need that on MacOS and Windows2000)
*/
char force_doublebuffering_;
public:
void show();
void show(int a, char **b) {Fl_Window::show(a,b);}
void flush();
void resize(int,int,int,int);
void hide();
~Fl_Double_Window();
/**
Creates a new Fl_Double_Window widget using the given
position, size, and label (title) string.
*/
Fl_Double_Window(int W, int H, const char *l = 0);
/**
See Fl_Double_Window::Fl_Double_Window(int w, int h, const char *label = 0)
*/
Fl_Double_Window(int X, int Y, int W, int H, const char *l = 0);
};
#endif
//
// End of "$Id: Fl_Double_Window.H 9637 2012-07-24 04:37:22Z matt $".
//
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