Fl_Cairo.H

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//
// Main Cairo support header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2025 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:
//
//     https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
//     https://www.fltk.org/bugs.php
//
 
#ifndef FL_CAIRO_H
#define FL_CAIRO_H
 
#include <FL/Fl.H>
 
# ifdef FLTK_HAVE_CAIRO
 
# include <cairo.h>
 
class FL_EXPORT Fl_Cairo_State {
public:
  Fl_Cairo_State()
    : cc_(0)
    , own_cc_(false)
    , autolink_(false)
    , window_(0)
    , gc_(0) {}
 
  // access attributes
  cairo_t *cc() const { return cc_; }         
  bool autolink() const { return autolink_; } 
  void cc(cairo_t *c, bool own = true) {
    if (cc_ && own_cc_)
      cairo_destroy(cc_);
    cc_ = c;
    if (!cc_)
      window_ = 0;
    own_cc_ = own;
  }
  void autolink(bool b);                   
  void window(void *w) { window_ = w; }    
  void *window() const { return window_; } 
  void gc(void *c) { gc_ = c; }            
  void *gc() const { return gc_; }         
 
private:
  cairo_t *cc_;        // contains the unique autoupdated cairo context
  bool own_cc_;        // indicates whether we must delete the cc, useful for internal cleanup
  bool autolink_;      // false by default, prevents the automatic cairo mapping on fltk windows
                       // for custom cairo implementations.
  void *window_, *gc_; // for keeping track internally of last win+gc treated
};
 
#endif // FLTK_HAVE_CAIRO
#endif // FL_CAIRO_H