File content as of revision 0:1bf8f02b0770:

/*********************************************************************
*                SEGGER Microcontroller GmbH & Co. KG                *
*        Solutions for real time microcontroller applications        *
**********************************************************************
*                                                                    *
*        (c) 1996 - 2014  SEGGER Microcontroller GmbH & Co. KG       *
*                                                                    *
*        Internet: www.segger.com    Support:  support@segger.com    *
*                                                                    *
**********************************************************************

** emWin V5.24 - Graphical user interface for embedded applications **
All  Intellectual Property rights  in the Software belongs to  SEGGER.
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 the following terms:

The software has been licensed to  NXP Semiconductors USA, Inc.  whose
registered  office  is  situated  at 411 E. Plumeria Drive, San  Jose,
CA 95134, USA  solely for  the  purposes  of  creating  libraries  for
NXPs M0, M3/M4 and  ARM7/9 processor-based  devices,  sublicensed  and
distributed under the terms and conditions of the NXP End User License
Agreement.
Full source code is available at: www.segger.com

We appreciate your understanding and fairness.
----------------------------------------------------------------------
File        : GUIDRV_Lin_Opt_16.h
Purpose     : Optimized routines, included by GUIDRV_Lin_..._16.c
---------------------------END-OF-HEADER------------------------------
*/

#ifdef __cplusplus
extern "C" {
#endif

/*********************************************************************
*
*       Static functions
*
**********************************************************************
*/
/*********************************************************************
*
*       _FillRectOpt16
*
* Purpose:
*   Optimized filling routine for 16 bpp
*/
static void _FillRectOpt16(GUI_DEVICE * pDevice, int x0, int y0, int x1, int y1) {
  DRIVER_CONTEXT * pContext;
  U32 * pDest;
  U32 * pDest0;
  U32 Off, OffLine;
  int RemPixels, NumLines, RemLines, RemItems;
  U32 Data, ColorMask;
  LCD_PIXELINDEX ColorIndex;

  pContext   = (DRIVER_CONTEXT *)pDevice->u.pContext;
  ColorIndex = LCD__GetColorIndex();
  Off        = XY2OFF32(pContext->vxSizePhys, x0, y0);
  pDest0     = OFF2PTR32(pContext->VRAMAddr, Off);
  RemPixels  = x1 - x0 + 1;
  NumLines   = y1 - y0 + 1;
  OffLine    = pContext->vxSizePhys >> 1;
  pDest      = NULL;
  if (GUI_pContext->DrawMode & LCD_DRAWMODE_XOR) {
    //
    // First DWORD
    //
    if (x0 & 1) {
      for (RemLines = NumLines, pDest = pDest0; RemLines; RemLines--) {
        Data = READ_MEM32P(pDest);
        #if (LCD_ENDIAN_BIG == 0)
          Data ^= 0xFFFF0000;
        #else
          Data ^= 0xFFFF;
        #endif
        WRITE_MEM32P(pDest, Data);
        pDest += OffLine;
      }
      pDest0++;
      RemPixels--;
    }
    //
    // Complete DWORDS
    //
    if (RemPixels >= 2) {
      for (RemLines = NumLines; RemLines; RemLines--) {
        RemItems = RemPixels;
        pDest    = pDest0 + OffLine * (RemLines - 1);
        do {
          Data  = READ_MEM32P(pDest);
          Data ^= 0xFFFFFFFF;
          WRITE_MEM32P(pDest, Data);
          pDest++;
          RemItems -= 2;
        } while (RemItems >= 2);
      }
      pDest0 = pDest;
      RemPixels -= (RemPixels >> 1) << 1;
    }
    //
    // Last DWORD
    //
    if (RemPixels > 0) {
      for (RemLines = NumLines, pDest = pDest0; RemLines; RemLines--) {
        Data = READ_MEM32P(pDest);
        #if (LCD_ENDIAN_BIG == 0)
          Data ^= 0xFFFF;
        #else
          Data ^= 0xFFFF0000;
        #endif
        WRITE_MEM32P(pDest, Data);
        pDest += OffLine;
      }
    }
  } else {
    //
    // First DWORD
    //
    if (x0 & 1) {
      for (RemLines = NumLines, pDest = pDest0; RemLines; RemLines--) {
        Data = READ_MEM32P(pDest);
        #if (LCD_ENDIAN_BIG == 0)
          Data &= 0xFFFF;
          Data |= (((U32)ColorIndex) << 16);
        #else
          Data &= 0xFFFF0000;
          Data |= ColorIndex;
        #endif
        WRITE_MEM32P(pDest, Data);
        pDest += OffLine;
      }
      pDest0++;
      RemPixels--;
    }
    //
    // Complete DWORDS
    //
    ColorMask = ColorIndex * 0x00010001;
    if (RemPixels >= 16) {
      RemPixels -= 16;

      for (RemLines = NumLines; RemLines; RemLines--) {
        RemItems = RemPixels;
        pDest    = pDest0 + OffLine * (RemLines - 1);
        do {
          WRITE_MEM32P(pDest,     ColorMask);
          WRITE_MEM32P(pDest + 1, ColorMask);
          WRITE_MEM32P(pDest + 2, ColorMask);
          WRITE_MEM32P(pDest + 3, ColorMask);
          WRITE_MEM32P(pDest + 4, ColorMask);
          WRITE_MEM32P(pDest + 5, ColorMask);
          WRITE_MEM32P(pDest + 6, ColorMask);
          WRITE_MEM32P(pDest + 7, ColorMask);
          pDest    += 8;
          RemItems -= 16;
        } while (RemItems >= 0);
      }
      pDest0 = pDest;

      RemPixels += 16;
      RemPixels -= (RemPixels >> 4) << 4;
    }
    if (RemPixels >= 2) {
      for (RemLines = NumLines; RemLines; RemLines--) {
        RemItems = RemPixels;
        pDest    = pDest0 + OffLine * (RemLines - 1);
        do {
          WRITE_MEM32P(pDest, ColorMask);
          pDest++;
          RemItems -= 2;
        } while (RemItems >= 2);
      }
      pDest0 = pDest;
      RemPixels -= (RemPixels >> 1) << 1;
    }
    //
    // Last DWORD
    //
    if (RemPixels > 0) {
      for (RemLines = NumLines, pDest = pDest0; RemLines; RemLines--) {
        Data = READ_MEM32P(pDest);
        #if (LCD_ENDIAN_BIG == 0)
          Data &= 0xFFFF0000;
          Data |= ColorIndex;
        #else
          Data &= 0xFFFF;
          Data |= (((U32)ColorIndex) << 16);
        #endif
        WRITE_MEM32P(pDest, Data);
        pDest += OffLine;
      }
    }
  }
}

#ifdef __cplusplus
}
#endif
/*************************** End of file ****************************/