/*************************************************************************************************************
                                                   uC/GUI
                                               嵌入式通用圖形軟件
File        : GUIPolyAA.C
Purpose     : Draw Polygon routines with Antialiasing
************************************************************************************************************/

#include "GUI_Private.h"

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


/*
          **********************************************
          *                                            *
          *              GL_FillPolygonAA              *
          *                                            *
          **********************************************
*/
static void _FillPolygonAA      (GUI_POINT* paPoint, int NumPoints, int x, int y) {
  int i;
  int Stat;
  int x0,x1;
  int PosFactor = GUI_Context.AA_HiResEnable ? 1 : GUI_Context.AA_Factor;
/* Calc horizontal limits and init GUI_AA */
  x0 = x1 = paPoint[0].x;
  for (i=1; i< NumPoints; i++) {
    int x =  paPoint[i].x;
    if (x<x0)
      x0 = x;
    if (x>x1)
      x1 = x;
  }
  if (!GUI_Context.AA_HiResEnable) {
    Stat = GUI_AA_Init(x0+x,x1+x);
  } else {
    Stat = GUI_AA_Init((x0+x)/GUI_Context.AA_Factor,(x1+x)/GUI_Context.AA_Factor);
  }
  if (Stat ==0) {
    /* Modify pointlist */
    if (!GUI_Context.AA_HiResEnable) {
      for (i=0; i< NumPoints; i++) {
        paPoint[i].x *= GUI_Context.AA_Factor;
        paPoint[i].y *= GUI_Context.AA_Factor;
      }
    }
    GL_FillPolygon(paPoint, NumPoints, x * PosFactor, y * PosFactor);
    /* Restore pointlist */
    if (!GUI_Context.AA_HiResEnable) {
      for (i=0; i< NumPoints; i++) {
        paPoint[i].x /= GUI_Context.AA_Factor;
        paPoint[i].y /= GUI_Context.AA_Factor;
      }
    }
    /* Cleanup */
  }
  GUI_AA_Exit();
}

void GUI_AA_FillPolygon(/*const*/ GUI_POINT* pPoints, int NumPoints, int x0, int y0) {
  GUI_LOCK();
  #if (GUI_WINSUPPORT)
    WM_ADDORG(x0,y0);
    WM_ITERATE_START(NULL); {
  #endif
/* Variables in MEMDEV module (with memory devices only) */
  #if GUI_SUPPORT_MEMDEV
    if (GUI_Context.pDeviceAPI->pfFillPolygonAA)
      GUI_Context.pDeviceAPI->pfFillPolygonAA(pPoints, NumPoints, x0, y0);
    else
  #endif
  _FillPolygonAA (pPoints, NumPoints, x0, y0);
  #if (GUI_WINSUPPORT)
    } WM_ITERATE_END();
  #endif
  GUI_UNLOCK();
}