/***********************************************************************************************************                                                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        : GUI2DLib.CPurpose     : Main part of the 2D graphics library---------------------------END-OF-HEADER------------------------------*/#include <stddef.h>           /* needed for definition of NULL */#include "GUI_Private.H"#include "GUIDebug.h"/*      *************************************************      *                                               *      *         Misc. helper routines                 *      *                                               *      **************************************************/void GL_SwapInt(int* pa, int* pb) {  int t = *pa;  *pa = *pb;  *pb = t;}#define ABS(v) ((v>0) ? v : -v)static int Abs(int v) { return ABS(v); }/*      *************************************************      *                                               *      *           Trigonometric functions             *      *                                               *      *************************************************All trigonometric functions are for internal usage only anduse the following conventions:      Angles: 4096 <==> 360