lcdp0.c

来自「LPC2368驱动淘宝上27元钱的TFT的代码」· C语言 代码 · 共 88 行

/*
*********************************************************************************************************
*   											 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		: LCDP0.C
Purpose 	: Color conversion routines for LCD-drivers
---------------------------END-OF-HEADER------------------------------
*/

#include "LCD_Private.h"	/* inter modul definitions */
#include "GUI.h"

/*********************************************************************
*
*   	Public code, 1/2/4/8 bpp color, LUT
*
**********************************************************************
*/
/*********************************************************************
*
*   	LCD_Color2Index_0
*/
unsigned LCD_Color2Index_0(LCD_COLOR Color, const LCD_PHYSPALETTE *pPhysPal)
{
	int i;
	int NumEntries = pPhysPal->NumEntries;
	int BestIndex = 0;
	U32 BestDiff = 0xffffff; /* Initialize to worst match */
	const LCD_COLOR* pPalEntry;
	/* Try to find perfect match */
	i = 0; pPalEntry = &pPhysPal->pPalEntries[0];
	do
	{
		if (Color == *(pPalEntry + i))
		{
			return i;
		}
	}
	while (++i < NumEntries);
	/* Find best match */
	i = 0; pPalEntry = &pPhysPal->pPalEntries[0];
	do
	{
		U32 Diff = GUI_CalcColorDist(Color, *(pPalEntry + i));
		if (Diff < BestDiff)
		{
			BestDiff = Diff;
			BestIndex = i;
		}
	}
	while (++i < NumEntries);
	return BestIndex;
}

/*********************************************************************
*
*   	LCD_Index2Color_0
*/
LCD_COLOR LCD_Index2Color_0(int Index, const LCD_PHYSPALETTE *pPhysPal)
{
	if ((unsigned) Index >= (unsigned) pPhysPal->NumEntries)
	{
		return 0;     /* Illegal index */
	}
	return *(pPhysPal->pPalEntries + Index);
}

/*********************************************************************
*
*   	LCD_GetIndexMask_0
*/
unsigned LCD_GetIndexMask_0(void)
{
	return ((1 << LCD_BITSPERPIXEL) - 1);
}

/*************************** End of file ****************************/