scale2x.hpp

/******************************************************************************
 
  nomlib - C++11 cross-platform game engine
 
Copyright (c) 2013, 2014 Jeffrey Carpenter <i8degrees@gmail.com>
All rights reserved.
 
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    scale2x Algorithm
1. Copyright (c) Andrea Mazzoleni
 
******************************************************************************/
#ifndef NOMLIB_SDL2_SCALE2X_HPP
#define NOMLIB_SDL2_SCALE2X_HPP
 
#include <algorithm>
 
#include "nomlib/config.hpp"

 
// C Macros used in scale2x functions
#define SCALE2x_READINT24(x) \
  ((x)[0]<<16 | (x)[1]<<8 | (x)[2])
 
#define SCALE2x_WRITEINT24(x, i) \
  {(x)[0]=i>>16; (x)[1]=(i>>8)&0xff; x[2]=i&0xff; }
 
namespace nom {
  namespace priv {

bool scale2x  ( void* source_buffer, void* destination_buffer,
                const int32 source_width, const int32 source_height,
                const int32 bits_per_pixel,
                const int16 source_pitch, int16 destination_pitch
              );

bool scale3x  ( void* source_buffer, void* destination_buffer,
                const int32 source_width, const int32 source_height,
                const int32 bits_per_pixel,
                const int16 source_pitch, int16 destination_pitch
              );

bool scale4x  ( void* source_buffer, void* destination_buffer,
                const int32 source_width, const int32 source_height,
                const int32 bits_per_pixel,
                const int16 source_pitch, int16 destination_pitch
              );
 
 
  } // namespace priv
} // namespace nom
 
#endif // include guard defined