BlinkenColorizer.c (f46f6ac) - BlinkenLib · BlinkenArea

BlinkenColorizer.c

/* BlinkenLib
 * version 0.5.3 date 2007-12-28
 * Copyright 2004-2007 Stefan Schuermans <stefan@schuermans.info>
 * Copyleft: GNU public license - http://www.gnu.org/copyleft/gpl.html
 * a blinkenarea.org project
 */

#include <string.h>

#include "Tools.h"
#include "BlinkenColorizer.h"

unsigned char BlinkenColorizerSolid( int step, int channels, int y, int x, int c )
{
  int substep, updown, chan;
  step %= channels * 2 * 254;
  substep = step % 254;
  updown = (step / 254) % 2;
  chan = (step / 254) / 2;
  if( updown == 0 ) {
    if( c == chan )
      return 255;
    else if( c == (chan + 1) % channels )
      return substep;
    else
      return 0;
  } else {
    if( c == chan )
      return 255 - substep;
    else if( c == (chan + 1) % channels )
      return 255;
    else
      return 0;
  }
  y = x = 0; // keep compiler quiet
}

unsigned char BlinkenColorizerRainbow( int step, int channels, int y, int x, int c )
{
  return BlinkenColorizerSolid( step + ((x + y) * 64), channels, y, x, c );
}

// type describing a colorizing modes
typedef struct _BlinkenColorizingModeDesc
{
  const char * name;
  unsigned char (* func)( int step, int channels, int y, int x, int c );
} BlinkenColorizingModeDesc;

// supported colorizing modes
static const BlinkenColorizingModeDesc BlinkenColorizingModeDescs[] = {
  { "solid", BlinkenColorizerSolid },
  { "rainbow", BlinkenColorizerRainbow },
};

// convert string to colorizing mode
// returns colorizing mode (>= 0) or -1 on error
int BlinkenColorizerStr2Mode( const char * str )
{
  unsigned int i;
  for( i = 0; i < arr_cnt( BlinkenColorizingModeDescs ); i++ )
    if( strcmp( str, BlinkenColorizingModeDescs[i].name ) == 0 )
      break;
  if( i < arr_cnt( BlinkenColorizingModeDescs ) )
    return i;
  return -1;
}

// convert colorizing mode to string
const char * BlinkenColorizerMode2Str( int mode )
{
  if( mode < 0 || mode >= (int)arr_cnt( BlinkenColorizingModeDescs ) )
    return "(unknown)";
  return BlinkenColorizingModeDescs[mode].name;
}

// get color for colorizing
unsigned char BlinkenColorizerGetColor( int channels, int mode, int step, int y, int x, int c )
{
  if( mode < 0 || mode >= (int)arr_cnt( BlinkenColorizingModeDescs ) )
    return 255;
  return BlinkenColorizingModeDescs[mode].func( step, channels, y, x, c );
}

BlinkenLib

BlinkenLib v.0.5.3 (2007-12-28)