Fl_Shared_Image.H

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//
// "$Id$"
//
// Shared image header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2017 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
//

#ifndef Fl_Shared_Image_H
#  define Fl_Shared_Image_H

#  include "Fl_Image.H"


// Test function for adding new formats
typedef Fl_Image *(*Fl_Shared_Handler)(const char *name, uchar *header,
                                       int headerlen);

// Shared images class.
class FL_EXPORT Fl_Shared_Image : public Fl_Image {

  friend class Fl_JPEG_Image;
  friend class Fl_PNG_Image;

private:
  static Fl_RGB_Scaling scaling_algorithm_; // method used to rescale RGB source images
#if FLTK_ABI_VERSION >= 10304
  Fl_Image *scaled_image_;
#endif
protected:

  static Fl_Shared_Image **images_;     // Shared images
  static int    num_images_;            // Number of shared images
  static int    alloc_images_;          // Allocated shared images
  static Fl_Shared_Handler *handlers_;  // Additional format handlers
  static int    num_handlers_;          // Number of format handlers
  static int    alloc_handlers_;        // Allocated format handlers

  const char    *name_;                 // Name of image file
  int           original_;              // Original image?
  int           refcount_;              // Number of times this image has been used
  Fl_Image      *image_;                // The image that is shared
  int           alloc_image_;           // Was the image allocated?

  static int    compare(Fl_Shared_Image **i0, Fl_Shared_Image **i1);

  // Use get() and release() to load/delete images in memory...
  Fl_Shared_Image();
  Fl_Shared_Image(const char *n, Fl_Image *img = 0);
  virtual ~Fl_Shared_Image();
  void add();
  void update();

public:
  const char    *name() { return name_; }

  int           refcount() { return refcount_; }

  int original() { return original_; }

  void          release();
  void          reload();

  virtual Fl_Image *copy(int W, int H);
  Fl_Image *copy() { return copy(w(), h()); }
  virtual void color_average(Fl_Color c, float i);
  virtual void desaturate();
  virtual void draw(int X, int Y, int W, int H, int cx, int cy);
  void draw(int X, int Y) { draw(X, Y, w(), h(), 0, 0); }
  void scale(int width, int height, int proportional = 1, int can_expand = 0);
  virtual void uncache();

  static Fl_Shared_Image *find(const char *name, int W = 0, int H = 0);
  static Fl_Shared_Image *get(const char *name, int W = 0, int H = 0);
  static Fl_Shared_Image *get(Fl_RGB_Image *rgb, int own_it = 1);
  static Fl_Shared_Image **images();
  static int            num_images();
  static void           add_handler(Fl_Shared_Handler f);
  static void           remove_handler(Fl_Shared_Handler f);
  static void scaling_algorithm(Fl_RGB_Scaling algorithm) {scaling_algorithm_ = algorithm; }
};

//
// The following function is provided in the fltk_images library and
// registers all of the "extra" image file formats that are not part
// of the core FLTK library...
//

FL_EXPORT extern void fl_register_images();

#endif // !Fl_Shared_Image_H

//
// End of "$Id$"
//