symbian通过缓冲区游戏绘图

最新推荐文章于 2025-09-05 18:10:31 发布

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#symbian #游戏 #each #user

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本文介绍了在Symbian平台上进行游戏开发时如何使用缓冲区进行绘图，包括创建背景图、贴图到背景以及将背景显示到屏幕上的过程，涉及到的关键操作如BitBlt和自定义的贴图函数MyBitMask。

塞班这货还是挺烂的。刚做了个游戏，需要旋转贴图、透明色贴图、与其依靠塞班，不如自己重写一遍。以下举个绘图的例子。

symbian绘图函数：

1.建立一张背景图

CFbsBitmap *iBack_BufferBitmap;

void CTSFishGameContainer::ConstructL(const TRect& aRect)

{

    TDisplayMode displayMode =
           CEikonEnv::Static()->ScreenDevice()->DisplayMode();
   iBack_BufferBitmap = new (ELeave) CFbsBitmap();
   User::LeaveIfError(iBack_BufferBitmap->Create(Rect().Size(), displayMode));

}

2.在背景图片上贴图

void CTSFishGameContainer::MyBitMask(CFbsBitmap* aDstBuf, TPoint aDstPoint,
       CFbsBitmap* aSrcBuf, TRect aSrcRec, TUint32 aTransparentColor,
       TInt aDirectFlag)
   {

   if (!aDstBuf || !aSrcBuf)
       {
       return;
       }

   // Determine range, use the small ones
   // Means only need to copy the intersection
   TRect drawSrcRect(aSrcRec);
   const TRect drawDstRect(TPoint(0, 0), aDstBuf->SizeInPixels());

   if (drawSrcRect.iTl.iX < 0)
       {
       drawSrcRect.iTl.iX = 0;
       }

   if (drawSrcRect.iBr.iX > aSrcBuf->SizeInPixels().iWidth)
       {
       drawSrcRect.iBr.iX > aSrcBuf->SizeInPixels().iWidth;
       }

   if (drawSrcRect.iTl.iY < 0)
       {
       drawSrcRect.iTl.iY = 0;
       }

   if (drawSrcRect.iBr.iY > aSrcBuf->SizeInPixels().iHeight)
       {
       drawSrcRect.iBr.iX > aSrcBuf->SizeInPixels().iHeight;
       }

   if (drawSrcRect.Width() <= 0 || drawSrcRect.Height() <= 0)
       {
       return;
       }

   TBitmapUtil bitmap1Util(aSrcBuf);
   TBitmapUtil bitmap4Util(aDstBuf);
   TUint32 transcolor = aTransparentColor;//CONVERT_BGR24_TO_BGR565(aTransparentColor);

   // Determine start address
   bitmap1Util.Begin(TPoint(0, 0));
   bitmap4Util.Begin(TPoint(0, 0));

   // Copy non-transparent pixels
   TUint32 pixel = 0;
   TPoint drawPos(0, 0);

   for (TInt y = 0; y < drawSrcRect.Height(); y++)
       {
       for (TInt x = 0; x < drawSrcRect.Width(); x++)
           {

           if (!aDirectFlag)
               {
               bitmap1Util.SetPos(TPoint(x, y));
               }
           else
               {
               bitmap1Util.SetPos(TPoint(drawSrcRect.iBr.iX - x - 1, y));
               }

           drawPos = TPoint(aDstPoint.iX + x, aDstPoint.iY + y);

           if (drawPos.iX >= 0 && drawPos.iX <= drawDstRect.iBr.iX
                   && drawPos.iY >= 0 && drawPos.iY <= drawDstRect.iBr.iY)
               {
               pixel = (bitmap1Util.GetPixel() & 0x00FFFFFF);
               if (pixel != transcolor)
                   {
                   bitmap4Util.SetPos(drawPos);
                   bitmap4Util.SetPixel(pixel);
                   }
               }
           }
       }

   // each Begin() must have a corresponding End()
   bitmap1Util.End();
   bitmap4Util.End();
   }

3.将绘制好的背景贴到屏幕真实屏幕上

void CTSFishGameContainer::Draw(const TRect& aRect) const
{
CWindowGc& gc = SystemGc();

    gc.Clear(aRect);
   if (iBack_BufferBitmap)
       {
        gc.BitBlt(Rect().iTl, iBack_BufferBitmap);
       }

}

4.绘制背景

void CTSFishGameContainer::UpdateGame()
   {
   //正向贴图
    MyBitMask(iBack_BufferBitmap, TPoint(100, 100), res_pic[GIF_HERO_TWO]->iFocusMap, TRect(
           TPoint(0, 0), res_pic[GIF_HERO_TWO]->iFocusMap->SizeInPixels()), KRgbWhite.Value(), 0);

   //反向贴图
   MyBitMask(iBack_BufferBitmap, TPoint(100, 200), res_pic[GIF_HERO_TWO]->iFocusMap, TRect(
           TPoint(0, 0), res_pic[GIF_HERO_TWO]->iFocusMap->SizeInPixels()), KRgbWhite.Value(), 1);


   if (IsVisible())
       {
       DrawDeferred();
       }

   return;

}