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RScreenUtils.cpp

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// Copyright 2002 Kenneth Guy,
// 
// You are free to take the source and do as you wish with it.
// However it would be nice if you let me know if the code was useful
// to you and give me an acknowledgement if you use a significant portion
// of the code in an application.
// 
// RScreenUtils.cpp

#include <e32std.h>
#include <e32svr.h>

//data
#include "numbers.h"

#include "RScreenUtils.h"

void RScreenUtils::DrawPicture(TPicture &aPicture) {
  DrawPictureAsm(&aPicture);
}

void RScreenUtils::BlankArea(TBlank &aBlank) {
  BlankAreaAsm(&aBlank);
}

RScreenUtils::RScreenUtils() : iScreenBase(NULL) {
}


TInt RScreenUtils::Open() {
  // get the screen info so we can work out the base address of the screen
  TPckgBuf<TScreenInfoV01> info;
  UserSvr::ScreenInfo(info);
  if(info().iScreenAddressValid==EFalse ||
     info().iScreenSize.iWidth!=640 ||
     info().iScreenSize.iHeight!=200) {
    return KErrNotSupported;
  }
    
  // screen memory is 2 bytes per pixel, top 4 bits unused,
  // 4 bits green, 4 bits blue.
  iScreenBase=STATIC_CAST(TUint16*,info().iScreenAddress);
  // there is palette information at the start of the screen
  // memory, for 12 bits per pixel this is 16 2 byte entries,
  // the first of which defines that the pixel size is 12 bits.
  // actual pallete information is ignored.
  iScreenBase += 16;
  return (KErrNone);
}


TUint16 *RScreenUtils::ScreenBase() {
  return iScreenBase;
}

void RScreenUtils::Close() {
  iScreenBase=NULL;
}

void RScreenUtils::Number(TUint aX,TUint aY,TUint32 aNumber,
                          TUint16 aForeColor,TUint16 aBackColor){
  HexNumber(aX,aY,BCDNumber(aNumber),aForeColor,aBackColor);
}

void RScreenUtils::HexNumber(TUint aX,TUint aY,TUint32 aNumber,
                             TUint16 aForeColor,TUint16 aBackColor){
                             
  if(iScreenBase==NULL)
    return;
  TUint offset=aX+aY*640;
  NumberAsm(iScreenBase+offset,aNumber,aForeColor,aBackColor);
}

void RScreenUtils::Blank(TUint16 aColor) {
  if(iScreenBase==NULL)
    return;
  BlankAsm(aColor);
}

TUint32 RScreenUtils::BCDNumber(TUint32 aNumber) {
  TUint32 out=0;
  TInt digit=0;
  while(aNumber!=0) {
    out += (aNumber%10) << (4*digit);
    digit++;
    aNumber /= 10;
  }
  return out;
}

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