guidev_banding.c

MCB2300_ucgui_LCD320240.rar LPC2368的uc/gui的移植

/*********************************************************************
*   			 SEGGER MICROCONTROLLER SYSTEME GmbH				 *
*   	 Solutions for real time microcontroller applications   	 *
**********************************************************************
*   																 *
*   	 (c) 1996 - 2004  SEGGER Microcontroller Systeme GmbH   	 *
*   																 *
*   	 Internet: www.segger.com    Support:  [e-mail]    *
*   																 *
**********************************************************************

***** emWin - Graphical user interface for embedded applications *****
emWin 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 re-
distributed in any way. We appreciate your understanding and fairness.
----------------------------------------------------------------------
File		: GUIDEV_Banding.c
Purpose 	: Implementation of banding memory devices
----------------------------------------------------------------------
Version-Date---Author-Explanation
----------------------------------------------------------------------
		010830 RS     GUI_MEMDEV_Draw now limits rectangle to
					  LCD area in order to avoid wasting computation time
		001109 RS     Bugfix: x0 was changed to 0 when moving the
					  active area. Fixed.
1.00	001015 RS     First release
0.00.00 00     RS     Initial version for internal tests
----------------------------------------------------------------------
Known problems or limitations with current version
----------------------------------------------------------------------
None
---------------------------END-OF-HEADER------------------------------
*/

#include <string.h>
#include "GUI_Private.h"
#include "GUIDebug.h"

/* Memory device capabilities are compiled only if support for them is enabled. */

#if GUI_SUPPORT_MEMDEV

/*********************************************************************
*
*   	static code
*
**********************************************************************
*/
/*********************************************************************
*
*   	_Min
*/
static int _Min(int v0, int v1)
{
	if (v0 <= v1)
	{
		return v0;
	}
	return v1;
}

/*********************************************************************
*
*   	public code
*
**********************************************************************
*/
/*********************************************************************
*
*   	GUI_MEMDEV_Draw
*
*  This routine uses a banding memory device to draw the
*  given area flicker free. It not only draws, but also
*  automatically calculates the size of, creates, moves
*  and then destroys the memory device.
*/
int GUI_MEMDEV_Draw(GUI_RECT *pRect, GUI_CALLBACK_VOID_P *pfDraw, void *pData, int NumLines, int Flags)
{
	int x0, y0, x1, y1, xsize, ysize;
	GUI_MEMDEV_Handle hMD;
	if (pRect)
	{
		x0 = (pRect->x0 < 0) ? 0 : pRect->x0;
		y0 = (pRect->y0 < 0) ? 0 : pRect->y0;
#if GUI_NUM_LAYERS == 1
		x1 = _Min(pRect->x1, LCD_GET_XSIZE() - 1);
		y1 = _Min(pRect->y1, LCD_GET_YSIZE() - 1);
#else
		x1 = _Min(pRect->x1, LCD_GetXSizeEx(GUI_Context.SelLayer) - 1);
		y1 = _Min(pRect->y1, LCD_GetYSizeEx(GUI_Context.SelLayer) - 1);
#endif
		xsize = x1 - x0 + 1;
		ysize = y1 - y0 + 1;
	}
	else
	{
		x0 = 0;
		y0 = 0;
#if GUI_NUM_LAYERS == 1
		xsize = LCD_GET_XSIZE();
		ysize = LCD_GET_YSIZE();
#else
		xsize = LCD_GetXSizeEx(GUI_Context.SelLayer);
		ysize = LCD_GetYSizeEx(GUI_Context.SelLayer);
#endif
	}
	if (NumLines == 0)
	{
		NumLines = -ysize;   /* Request <ysize> lines ... Less is o.k. */
	}
	if ((xsize <= 0) || (ysize <= 0))
	{
		return 0;
	}   		/* Nothing to do ... */
	/* Create memory device */
	hMD = GUI_MEMDEV_CreateEx(x0, y0, xsize, NumLines, Flags);
	if (!hMD)
	{
		GUI_DEBUG_ERROROUT("GUI_MEMDEV_Draw() Not enough memory ...");  		  /* Not enough memory ! */
		pfDraw(pData);
		return 1;
	}
	NumLines = GUI_MEMDEV_GetYSize(hMD);
	GUI_MEMDEV_Select(hMD);
	/* Start drawing ... */
	{
		int i;
		for (i = 0; i < ysize; i += NumLines)
		{
			int RemLines = ysize - i;
			if (RemLines < NumLines)
			{
				GUI_MEMDEV_ReduceYSize(hMD, RemLines);
			}
			if (i)
			{
				GUI_MEMDEV_SetOrg(hMD, x0, y0 + i);
				GUI_MEMDEV_Clear(hMD);
			}
			pfDraw(pData);
			GUI_MEMDEV_CopyToLCD(hMD);
		}
	}
	GUI_MEMDEV_Delete(hMD);
	GUI_MEMDEV_Select(0);
	return 0;   		  /* Success ! */
}

#else

void GUIDEV_Banding(void)
{
} /* avoid empty object files */

#endif /* GUI_MEMDEV_SUPPORT */

/*************************** end of file ****************************/