/*************************************************************************************************************
                                                   uC/GUI
                                               嵌入式通用圖形軟件
File        : GUIDevM.C
Purpose     : Implementation of measurement devices
              The purpose of a measurement device is to find out the
              area (Rectangle) affected by a sequence of drawing
              operations.
************************************************************************************************************/

#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



typedef struct {
  GUI_RECT rUsed;
  tLCDDEV_Color2Index*  pfColor2Index;
  tLCDDEV_Index2Color*  pfIndex2Color;
} GUI_MEASDEV;

#define GUI_MEASDEV_h2p(h) ((GUI_MEASDEV*)GUI_ALLOC_h2p(h))

/*
        *********************************************************
        *                                                       *
        *           internal routines                           *
        *                                                       *
				*     (not part of interface table)                     *
        *                                                       *
        *********************************************************
*/

void _MarkPixel(int x, int y) {
  GUI_MEASDEV* pDev = (GUI_MEASDEV*)(GUI_MEMDEV_h2p(GUI_Context.hDevData));
  if (x < pDev->rUsed.x0)
    pDev->rUsed.x0 = x;
  if (x > pDev->rUsed.x1)
    pDev->rUsed.x1 = x;
  if (y < pDev->rUsed.y0)
    pDev->rUsed.y0 = y;
  if (y > pDev->rUsed.y1)
    pDev->rUsed.y1 = y;
}

void _MarkRect(int x0, int y0, int x1, int y1) {
  GUI_MEASDEV* pDev = (GUI_MEASDEV*)(GUI_MEMDEV_h2p(GUI_Context.hDevData));
  if (x0 < pDev->rUsed.x0)
    pDev->rUsed.x0 = x0;
  if (x1 > pDev->rUsed.x1)
    pDev->rUsed.x1 = x1;
  if (y1 < pDev->rUsed.y0)
    pDev->rUsed.y0 = y0;
  if (y1 > pDev->rUsed.y1)
    pDev->rUsed.y1 = y1;
}



/*
        *********************************************************
        *                                                       *
        *         Universal draw Bitmap routine                 *
        *                                                       *
        *********************************************************
*/

static void _DrawBitmap   (int x0, int y0,
                       int xsize, int ysize,
                       int BitsPerPixel, 
                       int BytesPerLine,
                       const U8* pData, int Diff,
                       const LCD_PIXELINDEX* pTrans)
{
  GUI_USE_PARA(BitsPerPixel);
  GUI_USE_PARA(BytesPerLine);
  GUI_USE_PARA(pData);
  GUI_USE_PARA(Diff);
  GUI_USE_PARA(pTrans);
  _MarkRect(x0,y0,x0+xsize-1, y0+ysize-1);
}


static void _DrawHLine    (int x0, int y,  int x1) {
  _MarkRect(x0, y, x1, y);
}

static void _DrawVLine    (int x , int y0,  int y1) {
  _MarkRect(x, y0, x, y1);
}

static void _SetPixelIndex (int x, int y, int Index) {
  GUI_USE_PARA(Index);
  _MarkPixel(x,y);
}

static void _XorPixel (int x, int y){
  _MarkPixel(x,y);
}

static unsigned int _GetPixelIndex (int x, int y) { 
  GUI_USE_PARA(x);
  GUI_USE_PARA(y);
  return 0;
}

static void _FillRect     (int x0, int y0, int x1, int y1){
  _MarkRect(x0,y0,x1,y1);
}

static void _GetRect  (LCD_RECT* pRect) {
  pRect->x0 = pRect->y0 = -4095;
  pRect->x1 = pRect->y1 =  4095;
}

static  unsigned int _Color2Index (LCD_COLOR Color) {
  GUI_MEASDEV * pDev = GUI_MEASDEV_h2p(GUI_Context.hDevData);
  return pDev->pfColor2Index(Color);
}

static  LCD_COLOR _Index2Color (int Index) {
  GUI_MEASDEV * pDev = GUI_MEASDEV_h2p(GUI_Context.hDevData);
  return pDev->pfIndex2Color(Index);
}

static void CalcPolyRect(GUI_RECT *pr, const GUI_POINT* paPoint, int NumPoints) {
  int i;
  int xMin, xMax, yMin, yMax;
  xMin = GUI_XMAX;
  yMin = GUI_YMAX;
  xMax = GUI_XMIN;
  yMax = GUI_YMIN;
  for (i=0; i<NumPoints; i++) {
    int x = paPoint->x;
    int y = paPoint->y;
    if (xMin > x)
      xMin = x;
    if (xMax < x)
      xMax = x;
    if (yMin > y)
      yMin = y;
    if (yMax < y)
      yMax = y;
    paPoint++;
  }
  pr->x0 = xMin;
  pr->x1 = xMax;
  pr->y0 = yMin;
  pr->y1 = yMax;
}

static void _FillPolygon(const GUI_POINT* paPoint, int NumPoints, int x0, int y0) {
  GUI_RECT r;
  CalcPolyRect(&r, paPoint, NumPoints);
  GUI_MoveRect(&r, x0, y0);
  _MarkRect(r.x0, r.y0, r.x1, r.y1);
}

static void _FillPolygonAA(const GUI_POINT* paPoint, int NumPoints, int x0, int y0) {
  GUI_RECT r;
  CalcPolyRect(&r, paPoint, NumPoints);
  GUI_MoveRect(&r, x0, y0);
  if (GUI_Context.AA_HiResEnable) {
    r.x0 /= GUI_Context.AA_Factor;
    r.y0 /= GUI_Context.AA_Factor;
    r.x1 = (r.x1 + GUI_Context.AA_Factor -1) / GUI_Context.AA_Factor;
    r.y1 = (r.y1 + GUI_Context.AA_Factor -1) / GUI_Context.AA_Factor;
  }
  _MarkRect(r.x0, r.y0, r.x1, r.y1);
}



/*********************************************************************
*
*             Device structure
*
**********************************************************************
*/
static const tLCDDEV_APIList _APIList = {
  _Color2Index,
  _DrawBitmap,
  _DrawHLine,
  _DrawVLine,
  _FillRect,
  _GetPixelIndex,
  _GetRect,
  _Index2Color,
  _SetPixelIndex,
  _XorPixel,
  _FillPolygon,
  _FillPolygonAA
};


/*
  *********************************************************
  *
  *            Exported routines
  *
  *********************************************************

*/

/*
      *************************************************
      *                                               *
      *             Delete                            *
      *                                               *
      *************************************************
*/
void GUI_MEASDEV_Delete (GUI_MEASDEV_Handle hMemDev) {
/* Make sure memory device is not used */
  if ((GUI_Context.hDevData = hMemDev) != 0)
	  GUI_SelectLCD();
  GUI_ALLOC_FREE(hMemDev);
}


/*
      *************************************************
      *                                               *
      *             Clear Rectangle                   *
      *                                               *
      *************************************************
*/
void GUI_MEASDEV_ClearRect (GUI_MEASDEV_Handle hMemDev) {
  if (hMemDev) {
    GUI_MEASDEV* pDevData = (GUI_MEASDEV*)GUI_ALLOC_H2P(hMemDev);
    pDevData->rUsed.x0 = GUI_XMAX;
    pDevData->rUsed.y0 = GUI_YMAX;
    pDevData->rUsed.x1 = GUI_XMIN;
    pDevData->rUsed.y1 = GUI_YMIN;
  } 
}


/*
      *************************************************
      *                                               *
      *             Create                            *
      *                                               *
      *************************************************
*/

GUI_MEASDEV_Handle GUI_MEASDEV_Create (void) {
  int MemSize;
  GUI_MEASDEV_Handle hMemDev;
  MemSize = sizeof(GUI_MEASDEV);
  hMemDev = GUI_ALLOC_ALLOC(MemSize);
  if (hMemDev) {
    GUI_MEASDEV* pDevData = (GUI_MEASDEV*)GUI_ALLOC_H2P(hMemDev);
    pDevData->pfColor2Index = GUI_Context.pDeviceAPI->pfColor2Index;    
    pDevData->pfIndex2Color = GUI_Context.pDeviceAPI->pfIndex2Color;
    GUI_MEASDEV_ClearRect(hMemDev);
  } else {
    GUI_DEBUG_WARN("GUI_MEASDEV_Create: Alloc failed");
  }
  return hMemDev;
}


/*
      *************************************************
      *                                               *
      *             Select                            *
      *                                               *
      *************************************************
*/


void GUI_MEASDEV_Select(GUI_MEASDEV_Handle hMem) {
  if (hMem==0) {
    GUI_SelectLCD();
  } else {
    #if GUI_WINSUPPORT
      WM_Deactivate();
    #endif
    GUI_Context.hDevData = hMem;
    GUI_Context.pDeviceAPI  = &_APIList;
    GUI_Context.pClipRect_HL = NULL;
    LCD_SetClipRectMax();
  }
}


/*
      *************************************************
      *                                               *
      *             GetRect
      *                                               *
      *************************************************
*/

void GUI_MEASDEV_GetRect(GUI_MEASDEV_Handle hMem, GUI_RECT *pRect) {
  if (hMem) {
    GUI_MEASDEV* pDev = (GUI_MEASDEV*)GUI_ALLOC_H2P(hMem);
    if (pRect) {
      pRect->x0 = pDev->rUsed.x0;
      pRect->y0 = pDev->rUsed.y0;
      pRect->x1 = pDev->rUsed.x1;
      pRect->y1 = pDev->rUsed.y1;
    }
  }
}

#else

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

#endif /* GUI_MEMDEV_SUPPORT */