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GScaler.h

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//C-  -*- C++ -*-
//C- -------------------------------------------------------------------
//C- DjVuLibre-3.5
//C- Copyright (c) 2002  Leon Bottou and Yann Le Cun.
//C- Copyright (c) 2001  AT&T
//C-
//C- This software is subject to, and may be distributed under, the
//C- GNU General Public License, Version 2. The license should have
//C- accompanied the software or you may obtain a copy of the license
//C- from the Free Software Foundation at http://www.fsf.org .
//C-
//C- This program is distributed in the hope that it will be useful,
//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//C- GNU General Public License for more details.
//C- 
//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library
//C- distributed by Lizardtech Software.  On July 19th 2002, Lizardtech 
//C- Software authorized us to replace the original DjVu(r) Reference 
//C- Library notice by the following text (see doc/lizard2002.djvu):
//C-
//C-  ------------------------------------------------------------------
//C- | DjVu (r) Reference Library (v. 3.5)
//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
//C- | The DjVu Reference Library is protected by U.S. Pat. No.
//C- | 6,058,214 and patents pending.
//C- |
//C- | This software is subject to, and may be distributed under, the
//C- | GNU General Public License, Version 2. The license should have
//C- | accompanied the software or you may obtain a copy of the license
//C- | from the Free Software Foundation at http://www.fsf.org .
//C- |
//C- | The computer code originally released by LizardTech under this
//C- | license and unmodified by other parties is deemed "the LIZARDTECH
//C- | ORIGINAL CODE."  Subject to any third party intellectual property
//C- | claims, LizardTech grants recipient a worldwide, royalty-free, 
//C- | non-exclusive license to make, use, sell, or otherwise dispose of 
//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the 
//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU 
//C- | General Public License.   This grant only confers the right to 
//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to 
//C- | the extent such infringement is reasonably necessary to enable 
//C- | recipient to make, have made, practice, sell, or otherwise dispose 
//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to 
//C- | any greater extent that may be necessary to utilize further 
//C- | modifications or combinations.
//C- |
//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
//C- +------------------------------------------------------------------
// 
// $Id: GScaler.h,v 1.9 2003/11/07 22:08:21 leonb Exp $
// $Name: release_3_5_15 $

#ifndef _GSCALER_H_
#define _GSCALER_H_
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if NEED_GNUG_PRAGMAS
# pragma interface
#endif

// From: Leon Bottou, 1/31/2002
// Almost equal to my initial code.

#include "GException.h"
#include "GRect.h"
#include "GBitmap.h"
#include "GPixmap.h"

#ifdef HAVE_NAMESPACES
namespace DJVU {
# ifdef NOT_DEFINED // Just to fool emacs c++ mode
}
#endif
#endif




class GScaler  : public GPEnabled
{
protected:  
  GScaler();
public:
  virtual ~GScaler();
  void set_input_size(int w, int h);
  void set_output_size(int w, int h);
  void set_horz_ratio(int numer, int denom);
  void set_vert_ratio(int numer, int denom);
  void get_input_rect( const GRect &desired_output, GRect &required_input );
protected:
  // The sizes
  int inw, inh;
  int xshift, yshift;
  int redw, redh;
  int outw, outh;
  // Fixed point coordinates
  int *vcoord;
  GPBuffer<int> gvcoord;
  int *hcoord;
  GPBuffer<int> ghcoord;
  // Helper
  void make_rectangles(const GRect &desired, GRect &red, GRect &inp);
};



class GBitmapScaler : public GScaler
{
protected:
  GBitmapScaler(void);
  GBitmapScaler(int inw, int inh, int outw, int outh);
public:
  virtual ~GBitmapScaler();

  static GP<GBitmapScaler> create(void) {return new GBitmapScaler(); }

  static GP<GBitmapScaler> create(
    const int inw, const int inh, const int outw, const int outh)
  { return new GBitmapScaler(inw,inh,outw,outh); }

  void scale( const GRect &provided_input, const GBitmap &input,
              const GRect &desired_output, GBitmap &output );
protected:
  // Helpers
  unsigned char *get_line(int, const GRect &, const GRect &, const GBitmap &);
  // Temporaries
  unsigned char *lbuffer;
  GPBuffer<unsigned char> glbuffer;
  unsigned char *conv;
  GPBuffer<unsigned char> gconv;
  unsigned char *p1;
  GPBuffer<unsigned char> gp1;
  unsigned char *p2;
  GPBuffer<unsigned char> gp2;
  int l1;
  int l2;
};


class GPixmapScaler : public GScaler
{
protected:
  GPixmapScaler(void);
  GPixmapScaler(int inw, int inh, int outw, int outh);
public:
  virtual ~GPixmapScaler();

  static GP<GPixmapScaler> create(void) {return new GPixmapScaler(); }

  static GP<GPixmapScaler> create(
    const int inw, const int inh, const int outw, const int outh)
  { return new GPixmapScaler(inw,inh,outw,outh); }

  void scale( const GRect &provided_input, const GPixmap &input,
              const GRect &desired_output, GPixmap &output );
protected:
  // Helpers
  GPixel *get_line(int, const GRect &, const GRect &, const GPixmap &);
  // Temporaries
  GPixel *lbuffer;
  GPBufferBase glbuffer;
  GPixel *p1;
  GPBufferBase gp1;
  GPixel *p2;
  GPBufferBase gp2;
  int    l1;
  int    l2;
};





    



// -------- END

#ifdef HAVE_NAMESPACES
}
# ifndef NOT_USING_DJVU_NAMESPACE
using namespace DJVU;
# endif
#endif
#endif

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