rscreenutils.h

symbian 的一个 二维飞行游戏 源码 及相关技术文章

// Copyright 2002 Kenneth Guy,
// 
// RScreenUtils.h

#ifndef _RSCREENUTILS_H_
#define _RSCREENUTILS_H_

/** \file RScreenUtils.h 
    defines class RScreenUtils */


#include <e32std.h>

/** Direct screen access.

    This class provides utilities to plot numbers and sprites direct to
    the screen. It also provides the base address of the screen. All X
    coordinates are in steps of 2 pixels (ie one 32 bit word).
*/

class RScreenUtils {
  /** Picture to plot on the screen */
  class TPicture {
  public:
    const TUint16 *iData; ///< location of sprite data
    TUint32 iXSize; ///< sprite X size
    TUint32 iYSize; ///< sprite Y size
    TUint32 iXPos; ///< sprite X pos (0->319)
    TUint32 iYPos; ///< sprite Y pos (0->199)
  };

  /** Area of the screen to clear */
  class TBlank {
  public:
    TUint32 iColor; ///< color to blank to
    TUint32 iXSize; ///< area X size
    TUint32 iYSize; ///< area Y size
    TUint32 iXPos; ///< area X pos (0->319)
    TUint32 iYPos; ///< area Y pos (0->199)
  };

public:
  RScreenUtils();
  TInt Open();
  void Close();

  void Blank(TUint16 aColor);
  void Number(TUint aX,TUint aY,TUint32 aNumber,
              TUint16 aForeColor,TUint16 aBackColor);
  void HexNumber(TUint aX,TUint aY,TUint32 aNumber,
                 TUint16 aForeColor,TUint16 aBackColor);
  TUint16 *ScreenBase();

  void DrawPicture(TPicture &aPicture);
  void BlankArea(TBlank &aBlank);

private:
  TUint32 BCDNumber(TUint32 aNumber);

  static void NumberAsm(TUint16 *aPos,TUint32 aNumber,
                        TUint16 aForeColor,TUint16 aBackColor);
  void BlankAsm(TUint16 aColor);

  void BlankAreaAsm(TBlank *aBlank);
  void DrawPictureAsm(TPicture *aPicture);
private:
  TUint16 *iScreenBase; /**< Base address of screen memory.

                           number.s and blank.s require that this is
                           the first data member of the object */
};


#endif