guiaalib.c

MCB2300_ucgui_LCD320240.rar LPC2368的uc/gui的移植

/*
*********************************************************************************************************
*   											 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		: GUIAALib.C
Purpose 	: Antialiasing library
---------------------------END-OF-HEADER------------------------------
*/

#include "GUI_Private.h"
#include "LCD_ConfDefaults.h"   		 /* Required in order to know max. XSize so we do not waste memory */

#if GUI_SUPPORT_AA

#include <stdio.h>
#include <string.h>

/*********************************************************************
*
*   	Defines, config defaults
*
**********************************************************************
*/

#ifndef GUI_AA_LINEBUFFER_SIZE
#define GUI_AA_LINEBUFFER_SIZE LCD_XSIZE
#endif

/*********************************************************************
*
*   	Static data
*
**********************************************************************
*/

static U8   abAABuffer[GUI_AA_LINEBUFFER_SIZE];   /* This could be changed to dynamic memory ... */
static U8*  pabAABuffer;
static int  _x0, _x1, _y, _x0_InUse, _x1_InUse;
static GUI_RECT ClipRect_HL;

static tLCD_HL_APIList  		 DrawAPICopy;    /* Copy of device function ptr list */
static const tLCD_HL_APIList*    pLCD_HLPrev;    /* Copy of device function ptr list */

/*********************************************************************
*
*   	Static code
*
**********************************************************************
*/
/*********************************************************************
*
*   	_CleanLine
*/
static void _CleanLine(void)
{
	GUI_MEMSET(pabAABuffer, 0, _x1 - _x0 + 1);
	_y = -16383;  /* Invalidate */  
	_x0_InUse = 16383;
	_x1_InUse = -16383;
}

/*********************************************************************
*
*   	_FlushLine
*/
static void _FlushLine(void)
{
	int i;
	int iEnd = _x1_InUse - _x0;
	int IMax = GUI_Context.AA_Factor *GUI_Context.AA_Factor;
	for (i = _x0_InUse - _x0; i <= iEnd; i++)
	{
		int Intens = *(pabAABuffer + i);
		if (Intens)
		{
			/* Check we can use line draw */
			if (Intens == IMax)
			{
				int j;
				for (j = i; j < iEnd;)
				{
					if (*(pabAABuffer + j + 1) != IMax)
					{
						break;
					}
					j++;
				}
				/* Draw the full pixel(s) */
				if (j != i)
				{
					pLCD_HLPrev->pfDrawHLine(_x0 + i, _y, _x0 + j);
					i = j;  /*xxx*/
				}
				else
				{
					LCD_HL_DrawPixel(_x0 + i, _y);
				}
			}
			else
			{
				LCD_SetPixelAA(_x0 + i, _y, (15 * Intens + IMax / 2) / IMax);
			}
		}
	}
	_CleanLine();
}

/*********************************************************************
*
*   	_DrawHLine
*
* Purpose:
*   This is the redirected DrawHLine routine which is called
*   instead of the default output routine. Its job is to do
*   antialiasing and then perform the drawing operations.
*/
static void _DrawHLine(int x0, int y, int x1)
{
	int x0Real, x1Real;
	/* Make sure there is something to do */
	if (x1 < x0)
	{
		return;
	}
	/* Flush line if we are in an other pixel (real) line */
	if (y / GUI_Context.AA_Factor != _y)
	{
		_FlushLine();
		_y = y / GUI_Context.AA_Factor;
	}
	x0Real = x0 / GUI_Context.AA_Factor;
	x1Real = x1 / GUI_Context.AA_Factor;
	/* Handle used area (speed optimization for drawing) */
	if (x0Real < _x0_InUse)
	{
		_x0_InUse = x0Real;
	}
	if (x1Real > _x1_InUse)
	{
		_x1_InUse = x1Real;
	}
	/* Clip (should not be necessary ... Just to be on the safe side ! */
	if (x0Real < _x0)
	{
		x0 = _x0 * GUI_Context.AA_Factor;
	}
	if (x1Real > _x1)
	{
		x1 = (_x1 + 1) * GUI_Context.AA_Factor - 1;
	}
	/* Make sure there is still something to do (after clipping) */
	if (x1 < x0)
	{
		return;
	}
	/* Inc. hit counters in buffer */
	{
		int x0_Off = x0 / GUI_Context.AA_Factor - _x0;
		int x1_Off = x1 / GUI_Context.AA_Factor - _x0;
		int iRem = x1_Off - x0_Off + 1;
		U8 *pDest = pabAABuffer + x0_Off;
		if (iRem == 1)
		{
			*(pDest) += x1 - x0 + 1;
		}
		else
		{
			/* First Pixel */
			*pDest++ += ((x0_Off + _x0 + 1) * GUI_Context.AA_Factor - x0);
			/* Middle Pixels */
			for (; --iRem > 1;)
			{
				*pDest++ += GUI_Context.AA_Factor;
			}
			/* Last Pixel */
			*pDest += (1 + x1 - (x1_Off + _x0) * GUI_Context.AA_Factor);
		}
	}
}

/*********************************************************************
*
*   	CalcClipRectHL
*/
static void CalcClipRectHL(void)
{
	ClipRect_HL.x0 = GUI_Context.ClipRect.x0 * GUI_Context.AA_Factor;
	ClipRect_HL.y0 = GUI_Context.ClipRect.y0 * GUI_Context.AA_Factor;
	ClipRect_HL.x1 = (GUI_Context.ClipRect.x1 + 1) * GUI_Context.AA_Factor - 1;
	ClipRect_HL.y1 = (GUI_Context.ClipRect.y1 + 1) * GUI_Context.AA_Factor - 1;
}

/*********************************************************************
*
*   	Public code
*
**********************************************************************
*/
/*********************************************************************
*
*   	GUI_AA_Init
*/
int GUI_AA_Init(int x0, int x1)
{
	int r = 0;
	/* Bounds checking:
	   Make sure x0, x1 are in legal range ...
	   (The important point is that they span no more than configured as
		buffer size)
	*/
	if (x0 < 0)
	{
		x0 = 0;
	}
	if (x1 - x0 > GUI_AA_LINEBUFFER_SIZE - 1)
	{
		x1 = x0 + GUI_AA_LINEBUFFER_SIZE - 1;
	}
	/* Is there anything to do at all ??? */
	if (x1 < x0)
	{
		x1 = x0;   /* Not really ... */
		r = 1;
	}
	DrawAPICopy = *GUI_Context.pLCD_HL; /* Copy API table */
	pLCD_HLPrev = GUI_Context.pLCD_HL; /* Remember list ptr (for restore) */
	DrawAPICopy.pfDrawHLine = _DrawHLine;  /* modify function ptr. for hline */
	GUI_Context.pLCD_HL = &DrawAPICopy; 	 /* Use copy of fp-list */
	pabAABuffer = abAABuffer;
	_x0 = x0;
	_x1 = x1;
	_CleanLine();
	CalcClipRectHL();
	GUI_Context.pClipRect_HL = &ClipRect_HL;
	return r;
}

/*********************************************************************
*
*   	GUI_AA_Init_HiRes
*/
int GUI_AA_Init_HiRes(int x0, int x1)
{
	x0 /= GUI_Context.AA_Factor;
	x1 /= GUI_Context.AA_Factor;
	return GUI_AA_Init(x0, x1);
}

/*********************************************************************
*
*   	GUI_AA_SetFactor
*/
void GUI_AA_SetFactor(int Factor)
{
	GUI_Context.AA_Factor = Factor;
	CalcClipRectHL();      /* High level clipping depends on quality factor */
}

/*********************************************************************
*
*   	GUI_AA_GetFactor
*/
int GUI_AA_GetFactor(void)
{
	return GUI_Context.AA_Factor;
}

/*********************************************************************
*
*   	GUI_AA_DisableHiRes
*/
void GUI_AA_DisableHiRes(void)
{
	GUI_Context.AA_HiResEnable = 0;
}

/*********************************************************************
*
*   	GUI_AA_EnableHiRes
*/
void GUI_AA_EnableHiRes(void)
{
	GUI_Context.AA_HiResEnable = 1;
}

/*********************************************************************
*
*   	GUI_AA_HiRes2Pixel
*/
I16 GUI_AA_HiRes2Pixel(int HiRes)
{
	return GUI_Context.AA_Factor ? (HiRes / GUI_Context.AA_Factor) : HiRes;
}

/*********************************************************************
*
*   	GUI_AA_Exit
*/
void GUI_AA_Exit(void)
{
	_FlushLine();
	/* restore previous settings */
	GUI_Context.pLCD_HL = pLCD_HLPrev;
	GUI_Context.pClipRect_HL = &GUI_Context.ClipRect;
}

#else   						 /* Avoid problems with empty object modules */
void GUIAALib_C(void);
void GUIAALib_C(void)
{
}
#endif /* GUI_SUPPORT_AA */

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