lcdp8666.c

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/*
*********************************************************************************************************
*                                                uC/GUI
*                        Universal graphic software for embedded applications
*
*                       (c) Copyright 2002, Micrium Inc., Weston, FL
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*              礐/GUI is protected by international copyright laws. Knowledge of the
*              source code may not be used to write a similar product. This file may
*              only be used in accordance with a license and should not be redistributed
*              in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File        : LCD866.C
Purpose     : Color conversion routines for 866 mode
---------------------------END-OF-HEADER------------------------------
*/

#include <stddef.h>           /* needed for definition of NULL */
#include "LCD_Protected.h"    /* inter modul definitions */

int LCD_Color2Index_8666(LCD_COLOR Color) {
  int r,g,b,Index;
  r = Color&255;
  g = (Color>>8)&255;
  b = Color>>16;
/* Check if image is a gray scale ... */
	if ((r==g) && (g==b)) {
    return 120+ (r+8)/17;  /* Convert into colors from 120 - 135*/
	}
/* Convert into the 6*6*6 colors ... */
  r = (r*5+127)/255;
  g = (g*5+127)/255;
  b = (b*5+127)/255;
  Index = r+6*g+36*b;
  return (Index<108) ? Index : Index+40;
}

LCD_COLOR LCD_Index2Color_8666(int Index) {
  unsigned int r,g;
  U32 b;
  /* 16 Gray scale range ? */
  if ((Index>=120) && (Index<136)) {
    return (U32)0x111111 * (U32)(Index-120);
	}
  if (Index>=108) {
    if (Index<148)
			return 0;  /* Black for illegal indices */
		Index -= 40;
	}
  r = (Index%6)*(255/5);
  g = ((Index/6)%6)*(255/5);
  b = (Index/36)*(255/5);
  return r+(g<<8)+((U32)b<<16);
}